Battery pack

Abstract

This invention provides a battery pack. The battery pack includes a housing (1), a movable end plate (2), a cell module (3), and a locking structure. The cell module (3) and the movable end plate (2) are disposed inside the housing (1). One end of the cell module (3) abuts against the first side plate (11) of the housing (1). The movable end plate (2) can slide along its length and cooperate with the first side plate (11) to press the cell module (3). After the movable end plate (2) slides into place, the locking structure can lock the position of the movable end plate (2). The battery pack provided by this invention can solve the problem that existing battery packs cannot quickly and conveniently adapt to the fixing of cells of different sizes and quantities.

Description

Technical Field

[0001] This utility model relates to the field of battery tooling technology, and more specifically, to a battery pack. Background Technology

[0002] With the rapid development of new energy vehicles, power battery packs, as their core components, are undergoing continuous innovation in design and manufacturing technology to meet the demands for higher energy density, longer service life, and lower costs. Current cell assembly methods typically involve specialized stacking fixtures. This involves combining cells with metal or plastic end plates, MPPs (Multi-Purpose Modules), and pre-tensioning devices such as steel straps or packing straps to form battery modules, which are then hoisted into the battery pack housing. While this method effectively constrains the cells, ensuring the structural stability and electrical reliability of the battery modules, it requires customized stacking fixtures for different cell sizes and quantities. This results in high fixture development and processing costs, low reusability, and therefore, existing battery packs cannot quickly and conveniently adapt to the stacking and fixing requirements of cells of different sizes and quantities, exhibiting poor adaptability.

[0003] Utility model patent CN218569069U discloses a battery pack that uses end plates and side pressure strips to press and fix the battery cell assembly from the end face and side, thus eliminating the need for pre-tensioning devices such as steel straps or packing straps, reducing battery pack processing costs, and simplifying the installation process. However, the battery pack disclosed in this patent does not propose a solution that can quickly and conveniently adapt to the stacking and fixing of battery cells of different sizes and numbers. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack that can solve the problem that existing battery packs cannot quickly and conveniently accommodate the fixing of battery cells of different sizes and quantities.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, including a housing, a movable end plate, a cell module, and a locking structure. The cell module and the movable end plate are disposed in the housing. One end of the cell module abuts against a first side plate of the housing. The movable end plate can slide along the length direction and cooperate with the first side plate to press the cell module. After the movable end plate slides into place, the locking structure can lock the position of the movable end plate.

[0006] Furthermore, the housing includes a second side plate, a third side plate, and a bottom plate. The second side plate and the third side plate are arranged opposite to each other, and the bottom plate is located at the bottom of the second side plate and the third side plate. At least one of the second side plate, the third side plate, and the bottom plate is provided with a sliding groove extending along the sliding direction of the movable end plate. The movable end plate is disposed in the sliding groove and can slide along the sliding groove.

[0007] Furthermore, the locking structure includes a connecting portion that is detachably connected to the second side plate and / or the third side plate.

[0008] Furthermore, the connecting part includes a first connecting section and a second connecting section that are perpendicular to each other. The first connecting section is connected to the movable end plate, and the second connecting section is provided with a screw hole. After the movable end plate slides into place, the screw passes through the screw hole and can press and fix the second connecting section to the second side plate and / or the third side plate.

[0009] Furthermore, the battery cell module includes multiple battery cell groups arranged at intervals along the width direction, and a pressure bar is provided between two adjacent battery cell groups, which can press and fix the two adjacent battery cell groups.

[0010] Furthermore, the pressure strip includes a first pressure strip segment and a second pressure strip segment. The first pressure strip segment presses and fixes two adjacent battery cell groups. The second pressure strip segment is connected to the first pressure strip segment. The second pressure strip segment extends along the height direction in the gap between the two adjacent battery cell groups. The first end of the first pressure strip segment is connected to the first side plate. After the movable end plate slides into place, the first end of the second pressure strip segment is connected to the movable end plate.

[0011] Furthermore, the second end of the first pressure strip section is connected to the movable end plate.

[0012] Furthermore, the second end of the second pressure strip section is connected to the first side plate.

[0013] Furthermore, the outer sleeve of the pressure strip is provided with a buffer section, the length of which is greater than or equal to the length of the battery cell assembly.

[0014] Furthermore, the base plate is provided with a detachable partition, one end of which is connected to the first side plate and the other end is connected to the movable end plate. The partition can separate two adjacent battery cell groups.

[0015] Furthermore, the base plate is provided with a snap-fit ​​groove, and the partition can be inserted into the snap-fit ​​groove and slide along the snap-fit ​​groove.

[0016] Applying the technical solution of this utility model, the housing is used to accommodate and protect components such as the battery cell module and the movable end plate. The movable end plate is used to press the battery cell module and limit the battery cell in the length direction. Together with the first side plate, it fixes the battery cell module in the length direction, effectively preventing displacement of the battery cell due to vibration or thermal expansion during use, thus enhancing the structural stability of the battery pack and the reliability of electrical connections. The locking structure is used to fix the position of the movable end plate. When the battery cells are placed in the housing and stacked, the movable end plate is slid towards the first side plate to the position of pressing the battery cell module, and then the locking structure fixes the movable end plate in this position, thereby achieving the pressing and fixing of the battery cell module.

[0017] Different specifications and quantities of battery cells form battery cell modules of different lengths. The movable end plate is designed to slide along the length direction, so there is no need to customize different tooling for different battery cell modules formed by different specifications and quantities of battery cells. Simply slide the movable end plate to different positions to achieve quick and convenient clamping and fixing of battery cell modules of different lengths. This significantly improves the adaptability of stacking tooling, reduces the difficulty of stacking and fixing battery cells, and also reduces tooling development and processing costs. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of the battery pack of this utility model is shown;

[0020] Figure 2 A top view of the battery pack of this utility model is shown;

[0021] Figure 3 A schematic diagram of the overall structure of the battery pack housing of this utility model is shown;

[0022] Figure 4 A schematic diagram of the assembly of the movable end plate of the battery pack of this utility model is shown.

[0023] Figure 5 It shows Figure 4 An enlarged view of part A;

[0024] Figure 6 A front view of the movable end plate of the battery pack of this utility model is shown;

[0025] Figure 7 It shows Figure 6 An enlarged view of part B;

[0026] Figure 8 A schematic diagram of the pressure strip and cell module assembly structure of the battery pack of this utility model is shown.

[0027] Figure 9 It shows Figure 8 An enlarged view of part C;

[0028] Figure 10 A cross-sectional structural diagram of the pressure strip of the battery pack of this utility model is shown.

[0029] The above figures include the following reference numerals:

[0030] 1. Housing; 11. First side panel; 12. Second side panel; 13. Third side panel; 14. Bottom plate; 15. Slide groove; 2. Movable end plate; 21. Connecting part; 211. First connecting section; 212. Second connecting section; 3. Battery cell module; 31. Battery cell assembly; 4. Pressure bar; 41. First pressure bar section; 42. Second pressure bar section; 5. Buffer part; 6. Separator part. Detailed Implementation

[0031] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] See also Figures 1 to 10 As shown, this utility model provides a battery pack, which includes a housing 1, a movable end plate 2, a cell module 3, and a locking structure. The cell module 3 and the movable end plate 2 are disposed inside the housing 1. One end of the cell module 3 abuts against the first side plate 11 of the housing 1. The movable end plate 2 can slide along the length direction and cooperate with the first side plate 11 to press the cell module 3. After the movable end plate 2 slides into place, the locking structure can lock the position of the movable end plate 2.

[0033] In the above technical solution, the housing 1 is used to accommodate and protect components such as the cell module 3 and the movable end plate 2. The movable end plate 2 is used to press the cell module 3, limiting the cell in the length direction. Together with the first side plate 11, it fixes the cell module 3 in the length direction, effectively preventing displacement of the cell due to vibration or thermal expansion during use, thus enhancing the structural stability of the battery pack and the reliability of electrical connections. The locking structure is used to fix the position of the movable end plate 2. When the cells are placed in the housing and stacked, the movable end plate 2 is slid towards the first side plate 11 to the position of pressing the cell module 3, and then the locking structure fixes the movable end plate 2 in this position, thereby achieving the pressing and fixing of the cell module 3.

[0034] Different specifications and quantities of battery cells form battery cell modules of different lengths. The movable end plate 2 is designed to slide along the length direction, so there is no need to customize different tooling for different battery cell modules formed by different specifications and quantities of battery cells. Simply slide the movable end plate 2 to different positions to achieve quick and convenient clamping and fixing of battery cell modules of different lengths. This significantly improves the adaptability of stacking tooling, reduces the difficulty of stacking and fixing battery cells, and also reduces the tooling development and processing costs.

[0035] In one embodiment of the present invention, the housing 1 includes a second side plate 12, a third side plate 13, and a bottom plate 14. The second side plate 12 and the third side plate 13 are disposed opposite to each other, and the bottom plate 14 is located at the bottom of the second side plate 12 and the third side plate 13. At least one of the second side plate 12, the third side plate 13, and the bottom plate 14 is provided with a groove 15 extending along the sliding direction of the movable end plate 2. The movable end plate 2 is disposed in the groove 15 and can slide along the groove 15.

[0036] In the above technical solution, the second side plate 12 and the third side plate 13, which are arranged opposite to each other, and the bottom plate 14 are components of the housing 1, forming a closed housing structure. This provides a safe installation environment for the battery module and ensures accurate positioning of the cell module within the housing. It effectively supports both sides of the cell module, preventing lateral displacement or deformation, and ensuring the overall structural stability and safety of the battery pack. A sliding groove 15 is provided on the second side plate 12, the third side plate 13, or the bottom plate 14. Its function is to guide and restrict the sliding path of the movable end plate 2, allowing it to move along a predetermined track. This adapts to different cell modules formed by different specifications and quantities of cells. By sliding the movable end plate 2 to different positions, cell modules of different lengths can be quickly and conveniently clamped and fixed, significantly improving the adaptability of the stacking fixture, reducing the difficulty of stacking and fixing cells, and also reducing the development and processing costs of the fixture.

[0037] In one embodiment of the present invention, the locking structure includes a connecting part 21, which is detachably connected to the second side plate 12 and / or the third side plate 13.

[0038] In the above technical solution, the connecting part 21 is used to connect the movable end plate 2 with the second side plate 12 and / or the third side plate 13. When the movable end plate 2 slides to the pressing position of the pressing cell module 3, the connecting part 21 is connected and fixed with the second side plate 12 and / or the third side plate 13, thereby locking the position of the movable end plate 2, ensuring that the movable end plate 2 can tightly press the cell module, and at the same time preventing the movable end plate 2 from slipping due to vibration or cell expansion during use.

[0039] In one embodiment of the present invention, the connecting part 21 includes a first connecting segment 211 and a second connecting segment 212 connected together. The first connecting segment 211 and the second connecting segment 212 are arranged vertically. The first connecting segment 211 is connected to the movable end plate 2. The second connecting segment 212 can slide along the slide groove on the second side plate 12 and / or the third side plate 13. The second connecting segment 212 is provided with a screw hole. After the movable end plate 2 slides into place, the screw passes through the screw hole and can press and fix the second connecting segment 212 on the slide groove.

[0040] In the above technical solution, the first connecting segment 211 is used to connect the movable end plate 2 and the second connecting segment 212, and the second connecting segment 212 is used to connect the first connecting segment 211 with the second side plate 12 and / or the third side plate 13. The first connecting segment 211 and the second connecting segment 212 are arranged perpendicularly to form an L-shaped connecting part 21. Through the mutually perpendicular first connecting segment 211 and the second connecting segment 212, after the movable end plate 2 slides to the pressing position of the pressing cell module 3, the locking force between the second connecting segment 212 and the second side plate 12 and / or the third side plate 13 can be transmitted to the movable end plate 2 through the first connecting segment 211, thereby locking the position of the movable end plate 2.

[0041] In one embodiment of the present invention, the battery cell module 3 includes a plurality of battery cell groups 31 arranged at intervals along the width direction, and a pressure strip 4 is provided between two adjacent battery cell groups 31, the pressure strip 4 being able to press and fix the two adjacent battery cell groups 31.

[0042] In the above technical solution, the cell groups 31 are spaced apart along the width direction to optimize the space utilization efficiency of the battery pack while ensuring good heat dissipation performance of the cells. The pressure strip 4 is positioned between two adjacent cell groups 31, pressing the cells downwards from the top of the cell group 31, thereby limiting and fixing the cell module 3 in the height direction. Combined with the movable end plate and the first side plate limiting the length direction, this achieves the pressing and fixing of the cell module. No additional pre-tightening device is needed; the cell module can be pressed and fixed solely by the structure of the battery pack itself and the pressure strip 4, simplifying the battery pack installation process and reducing the cost of battery pack installation and fixing.

[0043] In one embodiment of this utility model, the pressure strip 4 includes a first pressure strip segment 41 and a second pressure strip segment 42. The first pressure strip segment 41 presses and fixes two adjacent battery cell groups 31. The second pressure strip segment 42 is connected to the first pressure strip segment 41. The second pressure strip segment extends along the height direction in the gap between the two battery cell groups 31. The first end of the first pressure strip segment 41 is connected to the first side plate 11. After the movable end plate 2 slides into place, the first end of the second pressure strip segment 42 is connected to the movable end plate 2.

[0044] In the above technical solution, the first pressure strip section 41 is used to press two adjacent battery cell groups 31 from top to bottom. The second pressure strip section 42 is set in the gap between the two battery cell groups 31 and extends along the height direction, so that the pressure strip 4 as a whole forms a T-shaped structure. The second pressure strip section 42 is mainly used to separate and limit the battery cell groups 31 between the two adjacent battery cell groups 31. At the same time, after the movable end plate 2 slides into place, the second pressure strip section 42 is connected to the movable end plate 2 by means of bolt connection or other connection methods, thereby locking the relative position of the pressure strip 4 and the movable end plate 2 in the length direction. The first end of the first pressure strip section 41 extends to the top of the first side plate 11 and is bolted to the first side plate 11, thereby ensuring that the pressure strip 4 is locked in the height direction, thus realizing the connection and fixation of the pressure strip 4. Through the connection and cooperation between the first pressure strip section 41 and the first side plate 11, and the connection and cooperation between the second pressure strip section 42 and the movable end plate 2, it is ensured that the pressure strip 4 can limit and fix the battery cell group 31 in the length and height directions, which further improves the strength and reliability of the battery cell module 3 installation and fixation.

[0045] In one embodiment of this utility model, the top of the first side plate 11 is provided with an elongated hole extending along the length of the pressure strip 4, and a bolt is inserted through the first end of the first pressure strip section 41 and threaded into the elongated hole to fix the first pressure strip section 41.

[0046] In the above technical solution, the elongated hole provides a larger fixing range for the first pressure strip section 41, so that the pressure strip can adjust the position of the first end of the first pressure strip section 41 fixed by bolts on the top of the first side plate 11 according to the length of the battery module, thereby fine-tuning the length of the pressure strip 4 pressed on the cell group 31, and improving the adaptability of the pressure strip 4 to battery modules of different lengths composed of different numbers of cell groups 31.

[0047] In one embodiment of this utility model, after the movable end plate 2 slides into place, the second end of the first pressure strip segment 41 is connected to the movable end plate 2.

[0048] In the above technical solution, after the movable end plate 2 slides into place, based on the connection between the first end of the first pressure strip section 41 and the first side plate 11, the second end of the first pressure strip section 41 and the movable end plate 2 are also connected and fixed by fasteners such as bolts, locking the relative position of the pressure strip 4 and the movable end plate 2 in the length direction, which further improves the strength and reliability of the installation and fixing of the battery cell module 3.

[0049] In one embodiment of this utility model, the second end of the second pressure strip segment 42 is connected to the first side plate 11.

[0050] In the above technical solution, the second end of the second pressure strip section 42 is also connected and fixed to the first side plate 11 by bolts and other fasteners, and the relative position of the pressure strip 4 and the first side plate 11 is locked in the length direction of the pressure strip 4, which further improves the strength and reliability of the installation and fixing of the battery cell module 3.

[0051] In one embodiment of this utility model, the pressure strip 4 is covered with a buffer part 5, and the length of the buffer part 5 is greater than or equal to the length of the battery cell assembly 31.

[0052] In the above technical solution, the buffer part 5 is made of elastic material such as rubber. The buffer part 5 is sleeved outside the pressure strip 4 to prevent the battery from directly contacting the rigid pressure strip 4 and being damaged under the pressing and fixing action of the pressure strip 4. The length of the buffer part 5 is designed to be greater than or equal to the length of the cell assembly 31 to ensure that the buffer part 5 has sufficient length to prevent the pressure strip 4 from contacting the cell assembly 31, thereby improving the safety and life of the battery.

[0053] In one embodiment of this utility model, the length of the buffer portion 5 protruding from the end face of the battery cell assembly 31 is 1mm to 2mm, and the movable end plate 2 can press the buffer portion 5 against the first side plate 11 so that the buffer portion 5 applies a pre-pressure to the battery cell assembly 31 in the width direction.

[0054] In the above technical solution, the end of the buffer part 5 near the movable end plate 2 protrudes from the end face of the battery cell assembly 31. When the movable end plate presses the battery cell assembly 31, the buffer part 5 is subjected to the pressure of the movable end plate and expands to both sides in the width direction, thereby squeezing the side of the battery cell assembly 31 and further improving the limiting effect of the buffer part 5 on the two adjacent battery cell assemblies 31 in the width direction.

[0055] In one embodiment of the present invention, a detachable partition 6 is provided on the base plate 14. One end of the partition 6 is connected to the first side plate 11. After the movable end plate 2 reaches the pressing position, the other end of the partition 6 is connected to the movable end plate 2. The partition 6 can separate two adjacent battery cell groups 31.

[0056] In the above technical solution, the separator 6 can guide and limit the cells during the stacking and arrangement of the cells, while separating adjacent cells to maintain a uniform spacing between cell groups 31. This prevents cell groups 31 from expanding due to heat and encroaching on the installation positions of adjacent cell groups 31, thus avoiding damage. The detachable design of the separator 6 ensures that when dealing with battery modules of different lengths composed of different numbers of cell groups 31, the separator 6 will not obstruct the adjustment and pressing position of the movable end plate 2 along the length direction. Furthermore, it allows for convenient replacement of separators 6 of appropriate length according to different battery module lengths, improving the adaptability and flexibility of the separator 6.

[0057] In one embodiment of the present invention, a snap-fit ​​groove is provided on the base plate 14, and the partition 6 can be inserted into the snap-fit ​​groove and slide along the snap-fit ​​groove.

[0058] In the above technical solution, the snap-fit ​​groove is used to accommodate the partition 6 and guide the sliding of the partition 6. The design that the partition 6 can slide in the snap-fit ​​groove ensures that even a shorter partition 6 can be conveniently adjusted in position as needed, further improving the adaptability and flexibility of the partition 6.

[0059] In one embodiment of this utility model, the ratio of the height of the partition 6 to the height of the battery cell assembly 31 is 1:6 to 1:5.

[0060] In the above technical solution, by setting the height of the separator 6 to between 1 / 6 and 1 / 5 of the height of the cell assembly 31, sufficient space for heat dissipation and buffering between adjacent cell assemblies 31 can be ensured, thereby improving the safety of the battery pack. An excessively high separator 6 would occupy the installation space of the second pressure strip section 42, affecting the buffering and clamping effect of the second pressure strip section 42 and its external buffer section 5 on the cell assembly 31; while an excessively low separator 6 might not provide sufficient guidance and separation. A ratio of 1:6 to 1:5 ensures separation while minimizing the space occupied by the separator 6 on other structural installations, contributing to improved safety and stability of the battery pack.

[0061] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: The housing 1 is used to accommodate and protect components such as the cell module 3 and the movable end plate 2. The movable end plate 2 is used to press the cell module 3, limit the cell in the length direction, and fix the cell module 3 in the length direction in conjunction with the first side plate 11, effectively preventing the cell from shifting due to vibration or thermal expansion during use, thus enhancing the structural stability of the battery pack and the reliability of electrical connections. The locking structure is used to fix the position of the movable end plate 2. When the cells are placed in the housing and stacked, the movable end plate 2 is slid towards the first side plate 11 to the position of pressing the cell module 3, and then the locking structure fixes the movable end plate 2 in this position, thereby achieving the pressing and fixing of the cell module 3.

[0062] Different specifications and quantities of battery cells form battery cell modules of different lengths. The movable end plate 2 is designed to slide along the length direction, so there is no need to customize different tooling for different battery cell modules formed by different specifications and quantities of battery cells. Simply slide the movable end plate 2 to different positions to achieve quick and convenient clamping and fixing of battery cell modules of different lengths. This significantly improves the adaptability of stacking tooling, reduces the difficulty of stacking and fixing battery cells, and also reduces the tooling development and processing costs.

[0063] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, The device includes a housing (1), a movable end plate (2), a battery cell module (3), and a locking structure. The battery cell module (3) and the movable end plate (2) are disposed inside the housing (1). One end of the battery cell module (3) abuts against the first side plate (11) of the housing (1). The movable end plate (2) can slide along the length direction and cooperate with the first side plate (11) to press the battery cell module (3). After the movable end plate (2) slides into place, the locking structure can lock the position of the movable end plate (2).

2. The battery pack according to claim 1, characterized in that, The housing (1) includes a second side plate (12), a third side plate (13), and a bottom plate (14). The second side plate (12) and the third side plate (13) are arranged opposite to each other. The bottom plate (14) is located at the bottom of the second side plate (12) and the third side plate (13). At least one of the second side plate (12), the third side plate (13), and the bottom plate (14) is provided with a sliding groove (15) extending along the sliding direction of the movable end plate (2). The movable end plate (2) is disposed in the sliding groove (15) and can slide along the sliding groove (15).

3. The battery pack according to claim 2, characterized in that, The locking structure includes a connecting part (21) which is detachably connected to the second side plate (12) and / or the third side plate (13).

4. The battery pack according to claim 3, characterized in that, The connecting part (21) includes a first connecting section (211) and a second connecting section (212) that are perpendicular to each other. The first connecting section (211) is connected to the movable end plate (2). The second connecting section (212) is provided with a screw hole. After the movable end plate (2) slides into place, the screw is inserted into the screw hole and can press and fix the second connecting section (212) onto the second side plate (12) and / or the third side plate (13).

5. The battery pack according to claim 2, characterized in that, The battery module (3) includes multiple battery cell groups (31) arranged at intervals along the width direction. A pressure strip (4) is also provided between two adjacent battery cell groups (31), and the pressure strip (4) can press and fix the two adjacent battery cell groups (31).

6. The battery pack according to claim 5, characterized in that, The pressure strip (4) includes a first pressure strip section (41) and a second pressure strip section (42). The first pressure strip section (41) presses and fixes two adjacent battery cell groups (31). The second pressure strip section (42) is connected to the first pressure strip section (41). The second pressure strip section (42) extends along the height direction in the gap between the two adjacent battery cell groups (31). The first end of the first pressure strip section (41) is connected to the first side plate (11). After the movable end plate (2) slides into place, the first end of the second pressure strip section (42) is connected to the movable end plate (2).

7. The battery pack according to claim 6, characterized in that, The second end of the first pressure strip segment (41) is connected to the movable end plate (2); and / or, the second end of the second pressure strip segment (42) is connected to the first side plate (11).

8. The battery pack according to claim 6, characterized in that, The pressure strip (4) is covered with a buffer part (5), the length of which is greater than or equal to the length of the battery cell assembly (31).

9. The battery pack according to claim 5, characterized in that, The base plate (14) is provided with a detachable partition (6). One end of the partition (6) is connected to the first side plate (11), and the other end is connected to the movable end plate (2). The partition (6) can separate two adjacent battery cell groups (31).

10. The battery pack according to claim 9, characterized in that, The base plate (14) is provided with a snap-fit ​​groove, and the partition (6) can be inserted into the snap-fit ​​groove and slide along the snap-fit ​​groove.

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