INFORMATION HANDLING SYSTEM MULTI-CELL CANTILEVERED BATTERY
A portable information handling system battery pack couples plural flat battery cells to a frame in first and second planes having battery cells of the first plane aligned to extend past battery cells of the second plane in a cantilevered manner. In one embodiment, the battery pack integrates a battery management unit and a wireless charger.
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The present invention relates in general to the field of information handling system integrated power sources, and more particularly to an information handling system multi-cell cantilevered battery.Description of the Related Art
As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to users is information handling systems. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems.
Portable information handling systems typically integrate processing components, input/output (I/O) devices and a power source in a portable housing to support mobile end user operations without hardwired connections to external power and peripherals. For example, portable information handling systems often integrate a touchscreen display at one side that acts as both a display to present information and an input device, such as by presenting a virtual keyboard that accepts touches as keyed inputs. Tablet information handling systems typically have a single planar housing with the display disposed on one side and covering the processing components. Convertible information handling systems typically have the display integrated in a lid housing portion that rotationally couples to a main housing portion containing the processing components under a keyboard. Convertible information handling systems rotate the lid housing portion relative to the main housing portion from a closed position that enhances portability to an open position that exposes the keyboard and display for end user interactions. Some convertible information handling systems rotate the housing portions 360 degrees to expose the display in a tablet mode. In some cases, the lid housing portion includes the processing components and separates from the main housing portion to act as a separate tablet device.
End users generally prefer portable information handling systems that have minimal weight for a given display size, however, reducing system weight typically results in reduced processing capabilities. To reduce weight for a given display size, system height is typically decreased, which decreases the amount of room for processing components and an integrated power source in the housing. Low Z-height housings generally have less room to support active thermal transfer, such as by a cooling fan, so that processing components selected for the housing tend to have lower power dissipation. For instance, low Z-height systems tend to include less powerful central processing units (CPUs) to avoid excess thermal energy release and smaller battery packs with shorter charge life. In addition, component placement tends to face restrictions so that dissipated thermal energy is not concentrated within the housing. Other component placement restrictions further complicate low Z-height systems, such as placement of antenna to achieve sufficient wireless signal communication and placement of speakers to provide adequate sound quality. Compromises in component selection and placement to achieve low Z-height tend to impact the end user's experience with the information handling system.
Conventional portable information handling systems have used battery packs as an internal power source built from lithium ion 18650 battery cells connected in parallel and series to achieve desired internal direct current voltages. A typical lithium ion battery cell has a native voltage of around 3.7 VDC so that four cells in series will provide a native voltage of around 14.1 VDC and five cells in series will provide around 17.8 VDC. A common conventional lithium ion battery pack might have eight battery cells with two sets of four battery cells in series. To reduce the vertical height of a battery pack, information handling systems have migrated from 18650 battery cells to flat battery cells with at least some of the flat battery cells stacked vertically. Vertical stacking of flat battery cells tends to offer greater footprint efficiency than battery packs built from round 18650 cells, thus supporting lower Z-height housing designs. However, during discharge and charge, battery cells release thermal energy that adds to the thermal dissipation difficulty associated with poor airflow within low Z-height housings.SUMMARY OF THE INVENTION
Therefore, a need has arisen for a system and method which allocates flat battery cells in a portable information handling system to provide improved thermal dissipation and housing space allocation.
In accordance with the present invention, a system and method are provided which substantially reduce the disadvantages and problems associated with previous methods and systems for integrating battery cells into a battery pack that powers a portable information handling system. Flat battery cells of a battery pack couple to a frame in first and second planes with the flat battery cells of the second plane offset relative to the flat battery cells of the first plane in a cantilevered disposition that improves thermal dissipation and component placement in an information handling system portable housing.
More specifically, a portable information handling system processes information with processing components disposed in a portable housing and powered by a battery pack. The battery pack has plural flat lithium ion battery cells coupled to a frame in two separate planes. The upper surface of the frame couples a row of battery cells disposed end to end and interfaced with a battery management unit that manages battery pack charge and discharge. The lower surface of the frame couples to battery cells in a cantilevered disposition relative to the row of battery cells on the upper surface of the frame. For instance, at each end of the row of battery cells, a battery cell of the lower surface extends a corner out from the row so that first and second sides of the battery cell on each end are misaligned relative to the row of battery cells. In one example embodiment, all of the battery cells have the same rectangular dimensions and the battery cells of the lower surface couple in an orientation perpendicular to the orientation of the battery cells in the row of the upper surface. In another example embodiment, a wireless charging device is integrated in the battery pack.
The present invention provides a number of important technical advantages. One example of an important technical advantage is that a portable information handling system battery pack integrates in a low Z-height housing with improved thermal dissipation. Cantilevered stacking of the battery cells reduces the temperature delta between battery cells that are vertically stacked by reducing battery cell surface contact to offer increased charge life in a reduced product size. Open regions defined by the battery pack provide room to support accessories like antenna and space to improve speaker acoustics. In one example embodiment, wireless charging integrates with the battery pack to provide a compact and efficient wireless charging capability in a low Z-height housing.
The present invention may be better understood, and its numerous objects, features and advantages made apparent to those skilled in the art by referencing the accompanying drawings. The use of the same reference number throughout the several figures designates a like or similar element.
A portable information handling system battery pack disposes battery cells in first and second planes with battery cells of plane coupled in a cantilever fashion relative to battery cells of the other plane. For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components.
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Although the present invention has been described in detail, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims.
1. An information handling system comprising:
- a housing;
- a processor disposed in the housing and operable to process information;
- a memory disposed in the housing and interfaced with the processor, the memory operable to store information; and
- a battery disposed in the housing, the battery having plural cells cooperatively interfaced to output a predetermined voltage, the plural cells having a flat rectangular shape, a first set of the plural cells coupled adjacent to each other end to end in a first plane, a second set of the plural cells stacked vertically in a second plane relative to the first plane and cantilevered to extend outward from each end of the first set of the plural cells.
2. The information handling system of claim 1 further comprising:
- a frame disposed between the first and second planes, the frame holding the first set of battery cells adjacent to each other and supporting the second set of battery cells cantilevered to the first set of battery cells; and
- a battery management unit integrated in the frame to coordinate charge and discharge of the battery cells as a battery pack.
3. The information handling system of claim 2 wherein each of the plural battery cells flat rectangular shape has a first set of parallel sides longer than a second set of parallel sides, the first set of plural cells having the first set of parallel sides perpendicular to the second set of plural cells first set of parallel sides.
4. The information handling system of claim 3 wherein:
- the first set of battery cells includes four battery cells disposed in a row adjacent to each other; and
- the second set of battery cells include a first battery cell at one end of the row having a corner cantilevered from the end of the row and second battery cell at an opposing end of the row having a corner cantilevered in a symmetric manner to the first battery cell.
5. The information handling system of claim 4 further comprising a wireless antenna disposed between the first and second battery cells of the second set of battery cells.
6. The information handling system of claim 4 wherein the housing and cantilevered battery cells define an acoustic chamber at each of opposing sides of the battery.
7. The information handling system of claim 4 further comprising a wireless charging device integrated in the battery between the first and second battery cells of the second set of battery cells.
8. The information handling system of claim 1 wherein the housing comprises a single planar piece containing the processor, memory and battery disposed under the display.
9. The information handling system of claim 1 wherein the housing comprises:
- a lid housing portion integrating the display;
- a main housing portion integrating the processor, memory and battery disposed under a keyboard; and
- a hinge rotationally coupling the lid housing portion and main housing portion.
10. A method for assembly of an information handling system, the method comprising:
- disposing processing components in a planar housing, the processing components configured to process information;
- coupling a first set of flat battery cells to a first side of a battery frame in a first plane, the first set of flat battery cells coupled end to end in a single row;
- coupling a second set of flat battery cells to a second side of the battery frame in a second plane, a first flat battery cell of the second set of flat battery cells aligned to extend past the first set of flat battery cells at a first end, a second flat battery cell of the second set of flat battery cells aligned to extend past the first set of flat battery cells at second end opposite the first end; and
- disposing the flat battery cells in the planar housing.
11. The method of claim 10 wherein the first and second flat battery cells of the second set of flat battery cells each couple to the first set of flat battery cells to have first and second sides extend past the first set of flat battery cells in a cantilevered manner.
12. The method of claim 11 further comprising:
- coupling a battery management unit to the battery frame; and
- interfacing the flat battery cells and the battery management unit through the battery frame.
13. The method of claim 12 wherein the first set of flat battery cells are aligned perpendicular to the second set of flat battery cells.
14. The method of claim 11 further comprising:
- integrating speakers in the planar housing; and
- defining an acoustic chamber between ends of the cantilevered flat battery cells and the planar housing to enhance sound output by the speakers.
15. The method of claim 11 further comprising:
- coupling a wireless charger to the frame between the first and second flat battery cells of the second set of flat battery cells; and
- interfacing the wireless charger with the flat battery cells.
16. The method of claim 15 further comprising:
- coupling a keyboard to planar housing in the second plane adjacent the second set of flat battery cells; and
- supporting the keyboard with the first set of flat battery cells.
17. A battery comprising:
- a frame having an upper surface and a lower surface;
- a first set of plural flat battery cells coupled to the frame upper surface in a row;
- a first flat battery cell coupled to the frame lower surface at a first end of the frame, the first flat battery cell having a rectangular shape with first and second perpendicular sides extending past the frame; and
- a second flat battery cell coupled to the frame lower surface at a second end of the frame opposite the first end, the second flat battery cell having a rectangular shape with first and second perpendicular sides extending past the frame.
18. The battery of claim 17 wherein all of the first set of flat battery cells, the first flat battery cell and the second flat battery cell have substantially the same dimensions.
19. The battery of claim 18 wherein the first and second flat battery cells are oriented perpendicular to an orientation of the flat battery cells of the first set of flat battery cells.
20. The battery of claim 19 further comprising a wireless charger coupled to the frame between the first and second flat battery cells.
Filed: Dec 14, 2018
Publication Date: Jun 18, 2020
Applicant: Dell Products L.P. (Round Rock, TX)
Inventors: Allen B. McKittrick (Cedar Park, TX), Ernesto Ramirez (Austin, TX), Jeffrey D. Kane (Austin, TX), Richard Christopher Thompson (Cedar Park, TX)
Application Number: 16/220,696