Abstract: The present disclosure provides a lithium-ion battery, the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive active material comprises a layered lithium-containing compound, the negative active material comprises graphite, the positive film and the negative film satisfy a relationship 0.3?(OIc×PDc)/(OIa×PDa)?20.0. The present disclosure can make the lithium-ion battery have smaller swelling and higher charging capability, and also make the lithium-ion battery have excellent cycle life and excellent safety performance during the long-term fast charging process.

Abstract: The present application provides an electrode assembly, a batter cell, a battery, an electric apparatus, and a manufacturing method and device of the electrode assembly. A negative plate of the electrode assembly includes a plurality of first negative active material layers located in an abutting region, and a plurality of second negative active material layers located in a non-abutting region; a positive plate of the electrode assembly includes a plurality of first positive active material layers located in the abutting region, and a plurality of second positive active material layers located in the non-abutting region. An active material capacity per unit area of the first negative active material layer is greater than that of the second negative active material layer; and/or an active material capacity per unit area of the first positive active material layer is less than that of the second positive active material layer.

Abstract: The embodiments of the present application provide a winding type electrode assembly including a positive electrode plate and a negative electrode plate; the positive electrode plate includes a first positive winding end portion and a positive winding middle section; the negative electrode plate includes a first portion and a second portion; and an active material layer of the negative electrode plate exceeds an active material layer of the positive electrode plate, and a difference between a maximum width of a negative active material layer of the first portion and a minimum width of a positive active material layer of the first positive winding end portion is larger than a difference between a maximum width of a negative active material layer of the second portion and a minimum width of a positive active material layer of the positive winding middle section.

Abstract: Embodiments of the present application provide an electrode assembly, a battery cell, a battery, and a method and a device for manufacturing an electrode assembly. The electrode assembly includes a first electrode plate and a second electrode plate. The first electrode plate and the second electrode plate are wound along a winding direction to form a winding structure, and the winding structure includes a bending region. The first electrode plate includes a first segment that exceeds a winding starting end of the second electrode plate, and at least a part of the first segment is configured to provide a support force to a part of the first electrode plate and the second electrode plate in the bending region and located at an outer side the first segment, making a structure of the first electrode plate and the second electrode plate more compact in the bending region.

Abstract: A vehicle speed control method, the method comprises: when a vehicle body is in a normal state, determining a first vehicle speed of the vehicle body based on road safety information; acquiring a driving segment of the vehicle body, and determining a pose variation amount of the vehicle body within the driving segment; determining a tangential acceleration of the vehicle body within the driving segment according to a correlation between the pose variation amount of the vehicle body and the tangential acceleration of the vehicle body; when the tangential acceleration of the vehicle body reaches a preset maximum tangential acceleration, determining a second vehicle speed of the vehicle body; and determining whether the second vehicle speed is smaller than the first vehicle speed, and if the second vehicle speed is smaller than the first vehicle speed, determining the second vehicle speed to be a target vehicle speed.

Abstract: The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vn for the nth charging stage is greater than Vn?1; charging the battery with Ij in the jth charging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than Vj, continuing to charge the battery with Ij; if the voltage value is not less than Vj and j<N, charging the battery with Ij+1; if the voltage value is not less than Vj and j=N, stopping charging the battery.

Abstract: The present disclosure provides a positive electrode plate and a battery, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on least one surface of the positive current collector and comprises a positive active material, the positive active material comprises a layered lithium-containing compound, and an OI value of the positive film represented by COI is less than or equal to 150. The positive electrode plate of the present disclosure has smaller swelling and excellent dynamics performance, and the battery of the present disclosure has high safety performance, excellent dynamics performance and long cycle life at the same time.

Abstract: A method, an apparatus and a device for charging a battery are provided. The method may include: defining a charging current In for an Nth charging stage of a charging process based on charging capability of the battery, wherein In<In-1; defining a charge cutoff voltage Vn for the Nth charging stage of the charging process, wherein Vn>Vn-1 and Vn is smaller than a theoretical charge cutoff voltage Vmax; in case that the N-1th charging stage is not a last charging stage, charging the battery with In-1 during the N-1th charging stage and proceeding to the Nth charging stage when a voltage across the battery reaches Vn-1; and in case that the N-1 th charging stage is the last charging stage, charging the battery with In-1 during the N-1th charging stage and stopping charging when the voltage across the battery reaches Vn-1.

Abstract: Disclosed are a heating method for a rechargeable battery, a control unit and a heating circuit. The heating method comprises: determining a frequency value of a pulse current for heating the rechargeable battery in response to a heating command of the rechargeable battery; determining a current value of the pulse current according to the frequency value and an acquired state parameter of the rechargeable battery; judging whether the current value satisfies a preset heating demand; if the current value satisfies the heating demand, generating the pulse current under control according to the frequency value; if the current value does not satisfy the heating demand, re-determining the frequency value and the current value of the pulse current. The embodiments of the present disclosure further provide a control unit and a heating circuit.

Abstract: The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vn for the nth charging stage is greater than Vn-1; charging the battery with Ij in the jth charging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than Vj, continuing to charge the battery with Ij; if the voltage value is not less than Vj and j<N, charging the battery with Ij+1; if the voltage value is not less than Vj and j=N, stopping charging the battery.

Abstract: The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vn for the nth charging stage is greater than Vn?1; charging the battery with Ij in the jth charging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than Vj, continuing to charge the battery with Ij; if the voltage value is not less than Vj and j<N, charging the battery with Ij+1; if the voltage value is not less than Vj and j=N, stopping charging the battery.

Abstract: A method named as Magnet Shifting to reduce torque ripple of permanent magnet synchronous motor is disclosed. A way of reasonably choosing the repeating unit of magnetic pole, the shifting ways and the shifting angle calculation of the first and second magnet shifting is described, which are carried on the repeating unit of magnetic poles individually or repeatedly to improve the performance of the motor. The method can be applied to surface, surface-inset and inner-embedded permanent magnet motors, which can reduce torque ripple caused by different torque components, including cogging torque, reluctance torque or permanent magnet torque. It also can quickly calculate the shifting angle of the magnetic pole by choosing repeating unit reasonably. Magnet shifting can effectively enhance the sinusoidal degree of back electrodynamic force (back-EMF) waveform, where the repeating units can offset the torque ripple between the maximum and the minimum value to reduce the different torque harmonics.

Abstract: The present disclosure provides a lithium-ion battery, the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The positive active material comprises a material having a chemical formula of LiaNixCoyMzO2, the negative active material comprises a graphite-type carbon material, the lithium-ion battery satisfies a relationship 58%?KYa/(KYa+KYc)×100%?72%. In the present disclosure, by reasonably matching the relationship between the anti-compression capability of the positive active material and the anti-compression capability of the negative active material, it can make the positive electrode plate and the negative electrode plate both have good surface integrity, and in turn make the lithium-ion battery have excellent dynamics performance and excellent cycle performance at the same time.

Abstract: The present disclosure provides a lithium-ion battery, the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive active material comprises a layered lithium-containing compound, the negative active material comprises graphite, the positive film and the negative film satisfy a relationship 0.3?(OIc×PDc)/(OIa×PDa)?20.0. The present disclosure can make the lithium-ion battery have smaller swelling and higher charging capability, and also make the lithium-ion battery have excellent cycle life and excellent safety performance during the long-term fast charging process.

Abstract: The present disclosure provides a positive electrode plate and a battery, the positive electrode plate comprises a positive current collector and a positive film, the positive film is provided on least one surface of the positive current collector and comprises a positive active material, the positive active material comprises a layered lithium-containing compound, and an OI value of the positive film represented by COI is less than or equal to 150. The positive electrode plate of the present disclosure has smaller swelling and excellent dynamics performance, and the battery of the present disclosure has high safety performance, excellent dynamics performance and long cycle life at the same time.

Abstract: A method named as Magnet Shifting to reduce torque ripple of permanent magnet synchronous motor is disclosed. A way of reasonably choosing the repeating unit of magnetic pole, the shifting ways and the shifting angle calculation of the first and second magnet shifting is described, which are carried on the repeating unit of magnetic poles individually or repeatedly to improve the performance of the motor. The method can be applied to surface, surface-inset and inner-embedded permanent magnet motors, which can reduce torque ripple caused by different torque components, including cogging torque, reluctance torque or permanent magnet torque. It also can quickly calculate the shifting angle of the magnetic pole by choosing repeating unit reasonably. Magnet shifting can effectively enhance the sinusoidal degree of back electrodynamic force (back-EMF) waveform, where the repeating units can offset the torque ripple between the maximum and the minimum value to reduce the different torque harmonics.

Abstract: The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery, according to the battery temperature and a mapping relationship between different temperature ranges and charging current values I, wherein a preset charging cut-off voltage value Vn for the nth charging stage is greater than Vn?1; charging the battery with Ij in the jth charging stage; acquiring a voltage value of the battery at the current time; if the voltage value is less than Vj, continuing to charge the battery with Ij; if the voltage value is not less than Vj and j<N, charging the battery with Ij+1; if the voltage value is not less than Vj and j=N, stopping charging the battery.

Abstract: The present disclosure provides a method, apparatus, and device for charging a battery, and storage medium. The method for charging a battery includes acquiring a battery temperature; determining a charging current value In for the nth charging stage of the battery corresponding to a charging cut-off SOC Sn for the nth charging stage, according to the acquired battery temperature and a preset mapping relationship between a charging cut-off SOC S and a charging current value I for different temperature ranges; charging the battery with Ij in the jth charging stage; acquiring a SOC of the battery at the current time; if the SOC is less than Sj, continuing to charge the battery with if the SOC is not less than Sj and j<N, charging the battery with Ij+1; if the SOC is not less than Sj and j=N, stopping charging the battery.

Abstract: A method, an apparatus and a device for charging a battery are provided in the present disclosure. The method may include: defining a charging current In for an Nth charging stage of a charging process based on charging capability of the battery, wherein In<In-1; defining a charge cutoff voltage Vn for the Nth charging stage of the charging process, wherein Vn>Vn-1 and Vn is smaller than a theoretical charge cutoff voltage Vmax; in case that the N?1th charging stage is not a last charging stage, charging the battery with In-1 during the N?1th charging stage and proceeding to the Nth charging stage when a voltage across the battery reaches Vn-1; and in case that the N?1th charging stage is the last charging stage, charging the battery with In-1 during the N?1th charging stage and stopping charging when the voltage across the battery reaches Vn-1.