Patents by Inventor James Robert Lim

James Robert Lim has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11901751
    Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
    Type: Grant
    Filed: May 13, 2021
    Date of Patent: February 13, 2024
    Assignee: Google LLC
    Inventors: Michael Jonathon Chen, William Alan Saperstein, James Robert Lim, David Wang
  • Publication number: 20230344099
    Abstract: The present document describes techniques associated with a blind battery connector. The blind battery connector described herein enables a user to blindly engage, safely and securely, a battery connector with a system-side connector. In aspects, the blind battery connector includes polarity-oriented magnets at both the battery connector and the system-side connector to automatically align and engage the battery connector with the system-side connector with correct orientation. The magnets may be embedded or removably assembled to the battery connector and the system-side connector. The blind battery connector controls initial alignment of the battery connector for coupling with the system-side connector and provides additional mechanical strength to the coupling against drop, vibration, and shock.
    Type: Application
    Filed: February 23, 2023
    Publication date: October 26, 2023
    Applicant: Google LLC
    Inventors: James Robert Lim, Pinci Liao, Chih-Min Chien, Chien-Yueh Tung
  • Publication number: 20230335824
    Abstract: This application is directed to a battery having a heating element. A connector of the battery includes a first terminal, a second terminal, and a heater terminal. One or more rechargeable battery cells are electrically coupled to the first and second terminals of the connector. The heating element is in contact with a subset of the battery cells, and includes a resistive heater path that is electrically coupled to the first and heater terminals of the connector and generates heat to warm the battery when a heater voltage is applied to the heater terminal. A waterproof material is wrapped around an exterior of the heating element and battery cells and prevents ambient water from contacting the heater element and battery cells. The waterproof material includes an opening to allow at least the first and second terminals of the connector to be electrically coupled to a logic board.
    Type: Application
    Filed: September 2, 2021
    Publication date: October 19, 2023
    Applicant: Google LLC
    Inventors: David Wang, Pak Heng Lau, Lauren Francine Chanen, James Robert Lim
  • Publication number: 20230304951
    Abstract: A battery pack includes a battery, a first temperature sensor configured to provide a first temperature value associated with a temperature of the battery, a heat source disposed proximate to the battery and configured to heat the battery, a second temperature sensor configured to provide a second temperature value associated with a temperature of the heat source, and a control board coupled to the first temperature sensor and the second temperature sensor, wherein the control board is configured to receive the first temperature value and the second temperature value. The control board is configured to compare the first temperature value and the second temperature value to determine a temperature gradient between the battery and the heat source and transmit an alert if the temperature gradient exceeds a first temperature gradient threshold.
    Type: Application
    Filed: May 4, 2023
    Publication date: September 28, 2023
    Applicant: Google LLC
    Inventors: David Wang, Arun Raghupathy, James Robert Lim, Ihab A. Ali, Chang Hong Ye
  • Publication number: 20230246470
    Abstract: The present document describes battery zero-voltage (0V) detection methodologies and applications thereof. These techniques detect the occurrence of the 0V condition and enable the device to continue operation after one 0V condition. These techniques may, however, shut down the device after detecting a second occurrence of the 0V condition of the battery. In an aspect, a combination of hardware and software is used at a system side of a device, when the device is connected to an external power source, to detect a 0V condition and/or distinguish the 0V condition from an undervoltage-protection (UVP) condition.
    Type: Application
    Filed: January 25, 2023
    Publication date: August 3, 2023
    Applicant: Google LLC
    Inventors: James Robert Lim, David Wang, Haoxing Zhang, Shang Shi
  • Patent number: 11689033
    Abstract: This application is directed to protecting a battery or battery by a battery protection system including two distinct protection integrated circuits (PICs). The two PICs are configured to determine whether a drive current of the battery is at fault and generate distinct switching signals indicating whether the drive current of the battery is at fault. The two PICs are interchangeable with each other. The battery protection system further includes control logic and two switching components. The control logic is configured to combine the switching signals provided by the two PICs to provide a combined switching signal. Each switching component is coupled to the control logic and configured to control a current path of charging and discharging the battery based on the combined switching signal.
    Type: Grant
    Filed: April 13, 2021
    Date of Patent: June 27, 2023
    Assignee: Google LLC
    Inventors: Haoxing Zhang, David Wang, James Robert Lim, Dietrich Shing-Quan Ho
  • Patent number: 11680918
    Abstract: A battery pack includes a battery, a first temperature sensor configured to provide a first temperature value associated with a temperature of the battery, a heat source disposed proximate to the battery and configured to heat the battery, a second temperature sensor configured to provide a second temperature value associated with a temperature of the heat source, and a control board coupled to the first temperature sensor and the second temperature sensor, wherein the control board is configured to receive the first temperature value and the second temperature value. The control board is configured to compare the first temperature value and the second temperature value to determine a temperature gradient between the battery and the heat source and transmit an alert if the temperature gradient exceeds a first temperature gradient threshold.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: June 20, 2023
    Assignee: Google LLC
    Inventors: David Wang, Arun Raghupathy, James Robert Lim, Ihab A. Ali, Chang Hong Ye
  • Patent number: 11668756
    Abstract: A method for monitoring battery degradation including receiving, from a pressure sensor, a first pressure value associated with a battery pack, comparing the first pressure reading to a first pressure threshold value and if the first pressure reading is greater than the first pressure threshold value, applying a first battery discharge pulse to the battery pack. The method further includes calculating a first internal resistance value of the battery pack in response to the first battery discharge pulse, comparing the first internal resistance value to an initial internal resistance value, and transmitting an alert to an electronic device if the first internal resistance value exceeds the initial internal resistance value.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: June 6, 2023
    Assignee: Google LLC
    Inventors: David Wang, Lauren Francine Chanen, James Robert Lim, Pak Heng Lau
  • Patent number: 11637434
    Abstract: This application is directed to a battery protection system including a sense resistor, a comparator, a switching component, and a protection integrated circuit (PIC). The sense resistor is electrically coupled in series with one of a plurality of rechargeable battery cells that are coupled in parallel in a battery. The comparator is coupled to the sense resistor and configured to compare a voltage drop across the sense resistor with a reference voltage to determine whether a subset of the rechargeable battery cells is not charging in the battery. The switching component is coupled to the battery, while the PIC is coupled to the comparator and the switching component. The PIC is configured to control charging and discharging of the battery including disabling the battery from being charged in accordance with a determination that a subset of the rechargeable battery cells is not charging in the battery.
    Type: Grant
    Filed: April 5, 2021
    Date of Patent: April 25, 2023
    Assignee: Google LLC
    Inventors: James Robert Lim, David Wang, Bonnie Yip, Haoxing Zhang
  • Publication number: 20230066939
    Abstract: This application is directed to an electronic device powered by one or more rechargeable battery cells. The electronic device includes a first negative temperature coefficient (NTC) thermistor proximate to the battery cells, and an open capacitor coupled in parallel with the NTC thermistor. The open capacitor has an open area and two electrodes that are at least partially exposed via the open area and electrically isolated. The electronic device further includes a control circuit coupled to the NTC thermistor and the open capacitor. The control circuit is configured to detect a voltage drop across the NTC thermistor and the open capacitor if conductive liquid enters the open area of the capacitor and electrically connects the two electrodes that are at least partially exposed via the open area.
    Type: Application
    Filed: October 18, 2022
    Publication date: March 2, 2023
    Applicant: Google LLC
    Inventors: James Robert Lim, Haoxing Zhang, David Wang, Dietrich Shing-Quan Ho, Yuanyuan Song
  • Patent number: 11482872
    Abstract: This application is directed to an electronic device powered by one or more rechargeable battery cells. The electronic device includes a first negative temperature coefficient (NTC) thermistor proximate to the battery cells, and an open capacitor coupled in parallel with the NTC thermistor. The open capacitor has an open area and two electrodes that are at least partially exposed via the open area and electrically isolated. The electronic device further includes a control circuit coupled to the NTC thermistor and the open capacitor. The control circuit is configured to detect a voltage drop across the NTC thermistor and the open capacitor if conductive liquid enters the open area of the capacitor and electrically connects the two electrodes that are at least partially exposed via the open area.
    Type: Grant
    Filed: January 8, 2021
    Date of Patent: October 25, 2022
    Assignee: Google LLC
    Inventors: James Robert Lim, Haoxing Zhang, David Wang, Dietrich Shing-Quan Ho, Yuanyuan Song
  • Publication number: 20220285957
    Abstract: Techniques to detect faults in a battery with at least two parallel battery cells. In some examples, a cell may fail or become disconnected. The circuitry of this disclosure may determine whether a battery pack has a fault by measuring battery parameters at the positive and negative terminals. When the circuitry detects a fault, the circuitry may adjust the charge rate so that the charge does not exceed the maximum charge rate of any single cell of the battery pack. In some examples, the circuitry may shut off the charge current to the battery pack to ensure that the charge rate does not exceed the maximum charge rate of any single cell. To avoid false positive fault detection, the circuitry of this disclosure may verify the detected fault and the parameters of the charging cycle before reducing the charging current.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 8, 2022
    Inventors: James Robert Lim, Michael Jonathon Chen, Mitchell Aaron Jones, William Alan Saperstein, David Wang
  • Publication number: 20220285741
    Abstract: An example outdoor mounted device includes a first battery configured to operate at a low temperature range that at least includes negative 20 Celsius; a second battery configured to operate at a high temperature range; a temperature sensor; and processing circuitry configured to: determine, based on data received from the temperature sensors, a current temperature; responsive to determining that the current temperature is within the low temperature range, cause one or more components of the computing device to operate using electrical energy sourced from the first battery; and responsive to determining that the current temperature is within the high temperature range, cause the one or more components of the computing device to operate using electrical energy sourced from the second battery.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 8, 2022
    Inventors: James Robert Lim, Wei Li, Brian Conner, Brett Wilson
  • Publication number: 20220239134
    Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.
    Type: Application
    Filed: May 13, 2021
    Publication date: July 28, 2022
    Inventors: Michael Jonathon Chen, William Alan Saperstein, James Robert Lim, David Wang
  • Publication number: 20220224128
    Abstract: This application is directed to an electronic device powered by one or more rechargeable battery cells. The electronic device includes a first negative temperature coefficient (NTC) thermistor proximate to the battery cells, and an open capacitor coupled in parallel with the NTC thermistor. The open capacitor has an open area and two electrodes that are at least partially exposed via the open area and electrically isolated. The electronic device further includes a control circuit coupled to the NTC thermistor and the open capacitor. The control circuit is configured to detect a voltage drop across the NTC thermistor and the open capacitor if conductive liquid enters the open area of the capacitor and electrically connects the two electrodes that are at least partially exposed via the open area.
    Type: Application
    Filed: January 8, 2021
    Publication date: July 14, 2022
    Inventors: James Robert Lim, Haoxing Zhang, David Wang, Dietrich Shing-Quan Ho, Yuanyuan Song
  • Publication number: 20220140627
    Abstract: A battery provisioning method is implemented by an outdoor electronic device having a rechargeable battery. The electronic device obtains geolocation information of a geographic location where the electronic device is located. The electronic device further obtains outdoor temperature information of the geographic location based on the geolocation information. A battery setting of the rechargeable battery is determined based on the outdoor temperature information, and used to provision the rechargeable battery of this electronic device. In some implementations, the rechargeable battery is provisioned with an upper limit for a state of charge at each time of installing and initializing the electronic device. During normal operation, the rechargeable battery of the electronic device is charged up to the upper limit for the state of charge, while the upper limit for the state of charge of the rechargeable battery may be updated periodically or upon request.
    Type: Application
    Filed: October 29, 2020
    Publication date: May 5, 2022
    Inventors: David Wang, James Robert Lim, Chang Hong Ye, Arun Prakash Raghupathy
  • Publication number: 20220099606
    Abstract: A battery pack includes a battery, a first temperature sensor configured to provide a first temperature value associated with a temperature of the battery, a heat source disposed proximate to the battery and configured to heat the battery, a second temperature sensor configured to provide a second temperature value associated with a temperature of the heat source, and a control board coupled to the first temperature sensor and the second temperature sensor, wherein the control board is configured to receive the first temperature value and the second temperature value. The control board is configured to compare the first temperature value and the second temperature value to determine a temperature gradient between the battery and the heat source and transmit an alert if the temperature gradient exceeds a first temperature gradient threshold.
    Type: Application
    Filed: September 25, 2020
    Publication date: March 31, 2022
    Applicant: Google LLC
    Inventors: David Wang, Arun Raghupathy, James Robert Lim, Ihab A. Ali, Chang Hong Ye
  • Publication number: 20220102691
    Abstract: A battery pack includes a battery, an outer enclosure housing the battery to form a battery pack, and an expandable portion extending from the outer enclosure and allowing the battery pack to expand along an X-axis of the battery pack. The expandable portion includes an inner portion, an outer portion, and a gap portion between the inner portion and the outer portion. The inner portion and the outer portion have a sealing layer to seal off an interior space and the gap portion is devoid of the sealing layer. The sealing layer allows for fluid communication between the gap portion and the interior space when a pressure exerted on the sealing layer exceeds a pressure threshold. The expandable portion includes folds allowing the expandable portion to fold toward the battery pack in an initial folded configuration and expand away from the battery pack in an at least partially unfolded configuration.
    Type: Application
    Filed: September 25, 2020
    Publication date: March 31, 2022
    Applicant: Google LLC
    Inventors: David Wang, Lauren Francine Chanen, James Robert Lim, Neha Ravi Dixit, Alexander P. Wroblewski
  • Publication number: 20220099749
    Abstract: A method for monitoring battery degradation including receiving, from a pressure sensor, a first pressure value associated with a battery pack, comparing the first pressure reading to a first pressure threshold value and if the first pressure reading is greater than the first pressure threshold value, applying a first battery discharge pulse to the battery pack. The method further includes calculating a first internal resistance value of the battery pack in response to the first battery discharge pulse, comparing the first internal resistance value to an initial internal resistance value, and transmitting an alert to an electronic device if the first internal resistance value exceeds the initial internal resistance value.
    Type: Application
    Filed: September 25, 2020
    Publication date: March 31, 2022
    Applicant: Google LLC
    Inventors: David Wang, Lauren Francine Chanen, James Robert Lim, Pak Heng Lau
  • Publication number: 20210376625
    Abstract: This application is directed to a battery protection system including a sense resistor, a comparator, a switching component, and a protection integrated circuit (PIC). The sense resistor is electrically coupled in series with one of a plurality of rechargeable battery cells that are coupled in parallel in a battery. The comparator is coupled to the sense resistor and configured to compare a voltage drop across the sense resistor with a reference voltage to determine whether a subset of the rechargeable battery cells is not charging in the battery. The switching component is coupled to the battery, while the PIC is coupled to the comparator and the switching component. The PIC is configured to control charging and discharging of the battery including disabling the battery from being charged in accordance with a determination that a subset of the rechargeable battery cells is not charging in the battery.
    Type: Application
    Filed: April 5, 2021
    Publication date: December 2, 2021
    Applicant: Google LLC
    Inventors: James Robert Lim, David Wang, Bonnie Yip, Haoxing Zhang