Battery pack

Abstract

The utility model provides a battery pack which comprises a box body, the box body comprises a bottom plate and a plurality of side plates, the side plates are arranged on the bottom plate in a surrounding mode and form a containing cavity, at least one side plate is internally provided with a first pressure relief space, the bottom plate is internally provided with a second pressure relief space, and the first pressure relief space is isolated from the second pressure relief space. The first battery cell module extends along a first direction, and the second battery cell module extends along a second direction. Therefore, the arrangement of the plurality of battery cell modules is more reasonable, and the overall space utilization rate of the accommodating space in the box body is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] Electric vehicles have high requirements for battery system energy and battery pack structural strength, making the battery a crucial component that directly determines the vehicle's range, power performance, and charging efficiency. However, some vehicles do not have a rectangular or cubic battery installation space; the battery packs in these technologies are typically rectangular or cubic, and the cell module arrangement is unreasonable, resulting in low battery pack space utilization efficiency. Utility Model Content

[0003] Embodiments of this application provide a battery pack that can improve the technical problem of low space utilization efficiency in battery boxes.

[0004] The battery pack provided in this application includes:

[0005] The enclosure includes a bottom plate and multiple side plates, the multiple side plates surrounding the bottom plate and forming a receiving chamber, at least one of the side plates is provided with a first pressure relief space, the bottom plate is provided with a second pressure relief space, and the first pressure relief space and the second pressure relief space are isolated from each other;

[0006] A first battery cell module is disposed in the receiving chamber. The first battery cell module extends along a first direction and can be depressurized through the first pressure relief space.

[0007] The second battery cell module is disposed in the receiving chamber. The second battery cell module extends along a second direction, which intersects with the first direction. The second battery cell module can release pressure through the second pressure relief space.

[0008] In some embodiments, the first cell module includes a first sub-module and a second sub-module disposed at intervals, and the battery pack further includes a separator disposed between the first sub-module and the second sub-module. The separator and the first sub-module are spaced apart to form a first pressure relief channel, and the separator and the second sub-module are spaced apart to form a second pressure relief channel. The first pressure relief channel and the second pressure relief channel communicate with the first pressure relief space.

[0009] In some embodiments, the battery pack further includes a first support member and a second support member, the first support member and the second support member being respectively disposed on both sides of the partition, the first support member having a first cavity, the second support member having a second cavity, the first cavity communicating with the first pressure relief space and the first pressure relief channel, and the second cavity communicating with the first pressure relief space and the second pressure relief channel.

[0010] In some embodiments, the plurality of side panels include two first side panels and two second side panels arranged opposite to each other. Each second side panel is connected to one of the first side panels at both ends. The first pressure relief space of one of the first side panels is connected to the outside of the box through the first pressure relief space of one of the second side panels. The other second side panel is provided with a third pressure relief space, which is connected to the second pressure relief space and the outside of the box.

[0011] In some embodiments, the first cell module includes a plurality of first cores, each of which is disposed along a second direction;

[0012] The second cell module includes a plurality of second cores, each of which is arranged along a first direction;

[0013] Wherein, the first direction is the height direction of the side plate, and the second direction is the length direction or width direction of the side plate.

[0014] In some embodiments, a plurality of first cores are stacked along a first direction, and a plurality of second cores are arranged along a second direction.

[0015] In some embodiments, the base plate includes two bottom walls, which are spaced apart to form the second pressure relief space. One of the bottom walls is used to support the second battery cell module and is provided with a plurality of pressure relief holes, each of which faces one of the second battery cells.

[0016] In some embodiments, the housing further includes a top plate covering the plurality of side plates. The top plate includes a first plate, a second plate, and a third plate. The first plate and the second plate are not equidistant from the bottom plate. The first plate is at least partially disposed relative to the first battery cell module, the second plate is at least partially disposed relative to the second battery cell module, and the third plate is obliquely connected between the first plate and the second plate.

[0017] In some embodiments, the height of the first plate from the base plate is between 200mm and 320mm, and the height of the second plate from the base plate is between 120mm and 160mm.

[0018] In some embodiments, the included angle between the third plate and the second plate is between 30° and 60°.

[0019] The beneficial effects of the embodiments of this application are as follows:

[0020] In embodiments of this application, the battery pack includes a housing, which includes a bottom plate and multiple side plates. The side plates surround the bottom plate and form a receiving cavity. A first battery cell module and a second battery cell module are disposed in the receiving cavity. The first battery cell module extends along a first direction, and the second battery cell module extends along a second direction. Compared with related technologies, the two modules in this application are arranged in different positions. When the battery pack shape is not a cuboid or cube, it can avoid mutual interference and influence between different battery cell modules, making the arrangement of multiple battery cell modules more reasonable and improving the overall space utilization of the housing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0023] Figure 2 This is an exploded view of the battery pack provided in an embodiment of this application;

[0024] Figure 3 This is a side view of the battery pack provided in an embodiment of this application.

[0025] Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the battery pack along line AA.

[0026] Figure 5 yes Figure 4 An enlarged schematic diagram of part A shown.

[0027] Figure 6 This is a top view of the battery pack provided in an embodiment of this application. Figure 1 .

[0028] Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the battery pack along BB.

[0029] Figure 8 yes Figure 7 A magnified schematic diagram of part B shown.

[0030] Figure 9 This is a top view of the battery pack provided in an embodiment of this application. Figure 2 .

[0031] Figure 10 yes Figure 9The diagram shows a cross-sectional view of the battery pack along the CC direction.

[0032] Figure 11 yes Figure 10 A magnified schematic diagram of part C shown.

[0033] Figure 12 yes Figure 10 The top view of the battery pack base plate is shown.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1000, battery pack;

[0036] 100. Enclosure; 10. Side panel; 101. First side panel; 1010. First pressure relief space; 102. Second side panel; 1021. Third pressure relief space;

[0037] 20. Base plate; 201. Second pressure relief space; 21. Bottom wall; 210. Pressure relief hole; 22. Support plate; 220. Third pressure relief port;

[0038] 30. First cell module; 31. First sub-module; 32. Second sub-module; 33. Separator; 331. First pressure relief space; 332. Second pressure relief space; 34. First support member; 3401. First cavity; 341. First connecting beam; 3410. First pressure relief port; 342. Second connecting beam; 3420. Second pressure relief port; 35. Support base;

[0039] 40. Second battery cell module;

[0040] 50. Top plate; 51. First plate; 52. Second plate; 53. Third plate; Detailed Implementation

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0042] Electric vehicles have high requirements for battery system energy and battery pack structural strength, making the battery a crucial component that directly determines the vehicle's range, power performance, and charging efficiency. Related technologies typically improve overall energy density by incorporating multiple cell modules, thereby optimizing power output and increasing the vehicle's range. However, since multiple cell modules may have different arrangements within the battery pack, their pressure relief paths may overlap and connect in series. When the pressure relief chambers of multiple battery modules are not designed independently, the pressure relief systems of different cell modules can interfere with each other during thermal runaway, affecting battery safety.

[0043] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application. Figure 2 This is an exploded view of a battery pack provided in an embodiment of this application. This application provides a housing 100, including a bottom plate 20 and a plurality of side plates 10, the plurality of side plates 10 surrounding the bottom plate 20 and forming a receiving chamber.

[0044] Please refer to Figures 3-5 , Figure 3 This is a side view of the battery pack provided in an embodiment of this application. Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the battery pack along AA. Figure 5 yes Figure 4 The diagram shows an enlarged view of part A. The housing 100 includes a first battery module 30 and a second battery module 40, which are disposed in the receiving chamber. The first battery module 30 is located on one side of the receiving chamber and extends along a first direction. The second battery module 40 is located on the other side of the receiving chamber and extends along a second direction. The second direction intersects the first direction, and the second direction may be perpendicular to the first direction or form an angle with the first direction.

[0045] In this application, the first cell module 30 extends along a first direction, and the second cell module 40 extends along a second direction. Compared with related technologies, the two cell modules in this application are arranged in different positions. When the battery pack shape is not a cuboid or cube, it can avoid mutual interference and influence between different cell modules, making the arrangement of multiple cell modules more reasonable and improving the overall space utilization of the housing 100.

[0046] In some embodiments, at least one of the side plates 10 is provided with a first pressure relief space 1010, and the bottom plate 20 is provided with a second pressure relief space 201, wherein the first pressure relief space 1010 and the second pressure relief space 201 are isolated from each other.

[0047] In related technologies, when multiple cell modules are housed within a cavity, their pressure relief paths may overlap and connect in series. Furthermore, if the pressure relief cavities of multiple battery modules are not designed independently, the pressure relief systems of different cell modules may interfere with each other during thermal runaway, affecting battery safety. Compared to related technologies, the cells of the first cell module 30 can be depressurized through the first pressure relief space 1010, and the cells of the second cell module 40 can be depressurized through the second pressure relief space 201. The independent pressure relief of the two cell modules effectively prevents the mutual interference of multiple cell modules under battery pack thermal runaway or thermal propagation, improving battery pack safety.

[0048] Please continue to refer to this. Figure 5 In some embodiments, the first cell module 30 includes a first sub-module 31 and a second sub-module 32 arranged at intervals. The battery pack 1000 also includes a separator 33, which is disposed between the first sub-module 31 and the second sub-module 32. A first pressure relief channel 331 is formed between the separator 33 and the first sub-module 31, and a second pressure relief channel 332 is formed between the separator 33 and the second sub-module 32. The first pressure relief channel 331 and the second pressure relief channel 332 communicate with the first pressure relief space 1010.

[0049] Specifically, this application also includes a first tray and a second tray. The first sub-module 31 is disposed in the first tray and bonded to the first tray by structural adhesive. The second sub-module 32 is disposed in the second tray and bonded to the second tray by structural adhesive. The pressure relief valve of each cell in each sub-module is directly opposite the pressure relief channel. The partition 33 makes the two sub-modules spaced apart and forms two independent pressure relief channels on both sides.

[0050] In addition, the two sub-modules are separated by a partition 33, and a side-lying sub-module is installed in each tray. This can effectively improve space utilization, even with the relatively high total height of the battery pack 1000.

[0051] Please refer to Figures 6-8 , Figure 6 This is a top view of the battery pack 1000 provided in an embodiment of this application. Figure 1 , Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the battery pack 1000 along BB. Figure 8 yes Figure 7The diagram shows an enlarged view of part B. In some embodiments, the battery pack 1000 further includes a first support member 34 and a second support member, which are respectively disposed on both sides of the partition 33. The first support member 34 has a first cavity 3401, and the second support member has a second cavity. The first cavity 3401 connects the first pressure relief space 1010 and the first pressure relief channel 331, and the second cavity connects the first pressure relief space 1010 and the second pressure relief channel 332.

[0052] Specifically, taking the first support member 34 as an example, the battery pack 1000 includes a support base 35, and the first support member 34 includes a first connecting beam 341 and a second connecting beam 342. The first connecting beam 341 is connected to the support base 35, and the second connecting beam 342 is attached to the side plate 10 and connected to the first connecting beam 341. The first cavity 3401 includes a first channel located in the first connecting beam 341 and a second channel located in the second connecting beam 342. The first channel is provided with a plurality of first pressure relief ports 3410 at intervals. The second pressure relief port 3420 is located at the connection between the first connecting beam 341 and the second connecting beam 342. Gas entering the first channel from the first pressure relief channel 331 passes through the first pressure relief port 3410 and enters the second channel through the second pressure relief port 3420. The second channel and the first pressure relief space 1010 are provided with a communication port. Gas in the second channel enters the first pressure relief space 1010 of the side plate 10 from the communication port.

[0053] Similarly, the second support includes a third connecting beam and a fourth connecting beam. The third connecting beam is connected to the support base 35, and the fourth connecting beam is attached to the side plate 10 and connected to the third connecting beam. This application will not repeat the details.

[0054] In some examples, the first connecting beam 341 and the second connecting beam 342 can be connected by welding, screwing, riveting, etc., such as by screwing with screws, bolts, studs, etc. The third connecting beam and the fourth connecting beam can be connected by welding, screwing, riveting, etc., such as by screwing with screws, bolts, studs, etc. This application does not limit the connection.

[0055] Understandably, the first support member 34 and the second support member can not only conduct pressure relief for the first battery cell module 30, but also improve the support strength of the housing 100.

[0056] Please refer to Figures 9-11 . Figure 9 This is a top view of the battery pack 1000 provided in an embodiment of this application. Figure 2 , Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the battery pack 1000 along the CC direction. Figure 11 yes Figure 10The diagram shows an enlarged view of part C. In some embodiments, the plurality of side panels 10 include two first side panels 101 and two second side panels 102 arranged opposite to each other. Each second side panel 102 is connected to one of the first side panels 101 at both ends. A first pressure relief space 1010 provided in one of the first side panels 101 is connected to the outside of the housing 100 through a first pressure relief space 1010 provided in one of the second side panels 102. The other second side panel 102 is provided with a third pressure relief space 1021, which is connected to the second pressure relief space 201 and the outside of the housing 100.

[0057] Specifically, each of the two second side plates 102 can be equipped with an explosion-proof valve. When gas accumulates inside the battery due to overcharging, short circuit, excessive temperature or internal chemical reaction, causing the internal pressure of the battery to rise, the explosion-proof valve can automatically open to release excess gas and prevent the battery casing from rupturing or exploding due to excessive pressure.

[0058] In this process, the depressurized gas from the first cell module 30 enters the second side plate 102, and the depressurized gas from the second cell module 40 enters another second side plate 102 that is opposite to it. Since the depressurization spaces between the two cell modules are independent of each other, the second side plate 102 into which the depressurized gas from the second cell module 40 enters is isolated from the other side plates 10. That is, the third depressurization space 1021 is isolated from the first depressurization space 1010. When the two cell modules depressurize, the depressurization paths will not overlap or coincide.

[0059] In some embodiments, the first cell module 30 includes a plurality of first cores, each of which is disposed along a second direction; the second cell module 40 includes a plurality of second cores, each of which is disposed along a first direction. The first direction is the height direction of the side plate 10, and the second direction is the length direction or width direction of the side plate 10.

[0060] In some embodiments, a plurality of first cores are stacked along a first direction, and a plurality of second cores are arranged along a second direction.

[0061] Specifically, since the battery pack 1000 for SUVs, MPVs, and off-road vehicles has a larger rear height compared to ordinary sedans, and has higher requirements for the battery pack 1000 in side and frontal collisions, off-road vehicles have higher requirements for the energy and structural strength of the battery pack 1000. Therefore, when the space designed for the battery pack 1000 in the rear area is larger than the space in the front, precise management of the battery system can be carried out on both the overall and local aspects, so that the battery system can achieve more stable and efficient performance, while improving safety and lifespan.

[0062] In some embodiments, the first cell module 30 is disposed in the rear region of the receiving chamber, and the second cell module 40 at the rear is disposed horizontally. The second cell module 40 is disposed in the front region of the receiving chamber, and multiple second cells are laid on the base plate 20. Due to the higher height of the rear of the battery, multiple first cells are stacked. This allows for more space to accommodate the horizontally disposed first cell module 30.

[0063] In addition, arranging multiple cells in different directions can make more effective use of the lateral and longitudinal space within the battery pack 1000, and can improve the space utilization rate of the front and rear areas when space is limited.

[0064] In some embodiments, the base plate 20 includes two bottom walls 21, which are spaced apart to form the second pressure relief space 201. One of the bottom walls 21 is used to support the second cell module 40 and is provided with a plurality of pressure relief holes 210, each of which faces a second cell.

[0065] Please combine Figure 11 refer to Figure 12 , Figure 12 yes Figure 10 The diagram shows a top view of the battery pack base plate. In some embodiments, the base plate 20 includes multiple support plates 22 connected between two bottom walls 21. A pressure-guiding channel is formed between the support plates 22 and the side plate 10. Each support plate 22 has a third pressure relief port 220 connecting the pressure-guiding channel and the second pressure relief space 201. Gas in the second pressure relief space 201 can flow along the pressure-guiding channel towards the third pressure relief space 2021. The distance between the two bottom walls 21 is between 5mm and 20mm, meaning the height of the pressure-guiding channel is between 5mm and 20mm, such as 5mm, 8mm, 10mm, 15mm, or 20mm. The total area of ​​the third pressure relief port 220 is greater than 800mm². 2 .

[0066] In some embodiments, the housing 100 further includes a top plate 50 covering the receiving chamber. The top plate 50 includes a first plate 51, a second plate 52, and a third plate 53. The distances between the first plate 51 and the second plate 52 and the bottom plate 20 are not equal. The first plate 51 is at least partially disposed relative to the first battery cell module 30, the second plate 52 is at least partially disposed relative to the second battery cell module 40, and the third plate 53 is obliquely connected between the first plate 51 and the second plate 52.

[0067] Understandably, due to the different heights of the front and rear ends, there is a height difference between the first plate 51 and the second plate 52. Compared to the third plate 53, which is a vertical structure connecting the two plates, the inclined setting allows for a gradual transition between different height differences and can increase the size of the accommodating chamber.

[0068] In some examples, the projection of the first plate 51 onto the base plate 20 completely covers the area where the first battery cell module 30 is located, and the projection of the second plate 52 onto the base plate 20 completely covers the area where the second battery cell module 40 is located.

[0069] In some embodiments, the overall length of the battery pack 1000, i.e. the length of the long side of the bottom plate 20 of the housing 100, is between 1000mm and 2100mm, such as 1000mm, 1300mm, 1600mm, 1900mm, and 2100mm. The length of the tail of the battery pack 1000, i.e. the length used to place the first cell module 30, is between 300mm and 800mm, such as 300mm, 500mm, 600mm, and 800mm.

[0070] In some embodiments, the first plate 51 is located in the rear end space, and its height from the base plate 20 is between 200mm and 320mm, such as 200mm, 240mm, 260mm, 280mm, 300mm, or 320mm. The second plate 52 is located in the front end space, and its height from the base plate 20 is between 120mm and 160mm, such as 120mm, 130mm, 140mm, 150mm, or 160mm.

[0071] In some embodiments, the included angle between the third plate 53 and the second plate 52 is between 30° and 60°, such as 30°, 40°, 45°, 50°, 55°, and 60°.

[0072] Understandably, the height difference between the second plate 52 and the first plate 51 affects the angle between the third plate 53 and the second plate 52. If the angle is too large, it will occupy vehicle space and affect the sealing of the housing 100. If the angle is too small, it will reduce the space utilization rate inside the battery pack 1000.

[0073] The battery pack 1000 provided in this application is used in electrical equipment, which can be electric vehicles, power tools, electric bicycles, energy storage systems, drones, mobile devices, etc.

[0074] In some examples, the electrical equipment is an electric vehicle. Understandably, the power battery is the core of an electric vehicle, providing driving power. The battery pack 1000 provided in this application can avoid the mutual interference of pressure leakage from multiple cell modules, improving the safety of the electric vehicle.

[0075] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, include: The enclosure includes a bottom plate and multiple side plates, the multiple side plates surrounding the bottom plate and forming a receiving chamber; A first battery cell module is disposed in the receiving cavity, and the first battery cell module extends along a first direction; A second battery cell module is disposed in the receiving cavity, and the second battery cell module extends along a second direction, which intersects with the first direction.

2. The battery pack according to claim 1, characterized in that, At least one of the side plates is provided with a first pressure relief space, and the bottom plate is provided with a second pressure relief space, wherein the first pressure relief space and the second pressure relief space are isolated from each other. The first cell module can be depressurized through the first pressure relief space, and the second cell module can be depressurized through the second pressure relief space.

3. The battery pack according to claim 2, characterized in that, The first cell module includes a first sub-module and a second sub-module arranged at intervals. The battery pack also includes a separator, which is disposed between the first sub-module and the second sub-module. The separator and the first sub-module are spaced apart to form a first pressure relief channel, and the separator and the second sub-module are spaced apart to form a second pressure relief channel. The first pressure relief channel and the second pressure relief channel are connected to the first pressure relief space.

4. The battery pack according to claim 3, characterized in that, The battery pack further includes a first support member and a second support member, which are respectively disposed on both sides of the partition. The first support member has a first cavity, and the second support member has a second cavity. The first cavity is connected to the first pressure relief space and the first pressure relief channel, and the second cavity is connected to the first pressure relief space and the second pressure relief channel.

5. The battery pack according to claim 4, characterized in that, The plurality of side panels include two first side panels and two second side panels arranged opposite to each other. Each second side panel is connected to one of the first side panels at both ends. The first pressure relief space of one of the first side panels is connected to the outside of the box through the first pressure relief space of one of the second side panels. The other second side panel is provided with a third pressure relief space, which is connected to the second pressure relief space and the outside of the box.

6. The battery pack according to any one of claims 2-5, characterized in that, The first battery cell module includes a plurality of first cores, each of which is arranged along a second direction; The second cell module includes a plurality of second cores, each of which is arranged along a first direction; Wherein, the first direction is the height direction of the side plate, and the second direction is the length direction or width direction of the side plate.

7. The battery pack according to claim 6, characterized in that, Multiple first cores are stacked along a first direction; Multiple second cores are arranged along a second direction.

8. The battery pack according to claim 7, characterized in that, The base plate includes two bottom walls, which are spaced apart to form the second pressure relief space. One of the bottom walls is used to support the second cell module and is provided with multiple pressure relief holes, each of which faces one of the second cells.

9. The battery pack according to claim 6, characterized in that, The housing also includes a top plate, which covers the receiving chamber. The top plate includes a first plate, a second plate, and a third plate. The first plate and the second plate are not equidistant from the bottom plate. The first plate is at least partially disposed relative to the first battery cell module, and the second plate is at least partially disposed relative to the second battery cell module. The third plate is obliquely connected between the first plate and the second plate.

10. The battery pack according to claim 9, characterized in that, The height of the first plate from the base plate is between 200mm and 320mm, and the height of the second plate from the base plate is between 120mm and 160mm.

11. The battery pack according to claim 9, characterized in that, The angle between the third plate and the second plate is between 30° and 60°.

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