Battery pack

Abstract

The application discloses a battery pack, and belongs to the technical field of batteries.The battery pack comprises a plurality of battery monomers, a damping assembly and a plurality of flexible connecting pieces.The plurality of battery monomers are arranged along a first direction.The damping assembly is arranged on one side of one of the battery monomers along the first direction.The damping assembly is connected with at least one battery monomer and used for adjusting the expansion force of the plurality of battery monomers.The plurality of flexible connecting pieces are electrically connected with adjacent two battery monomers.The application sets the damping assembly on one side of one of the plurality of battery monomers, the battery monomer can gradually transmit the expansion force to the damping assembly, the damping assembly absorbs the expansion force, the battery monomers in the battery pack can bear the bearable expansion force in the whole life cycle, and the battery monomers bear uniform force in the whole life cycle.Meanwhile, the adjacent two battery monomers are connected through the flexible connecting pieces, and the stability of the electrically connected battery monomers is ensured.

Description

Technical Field

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

[0002] As a crucial energy storage unit, the battery pack's individual cells expand and thicken during the later stages of their lifespan due to internal physicochemical changes. Since multiple cells are stacked within the pack, this expansion causes adjacent cells to be compressed, resulting in significant forces hindering the expansion of individual cells. This can damage the battery pack's structure, rapidly accelerate the performance degradation of individual cells, and pose substantial safety risks. Utility Model Content

[0003] Purpose of the utility model: This application provides a battery pack that aims to solve the problem that insufficient expansion space for existing battery cells leads to damage to the battery pack structure, accelerated performance degradation of battery cells, and significant safety risks.

[0004] Technical solution: A battery pack according to an embodiment of this application includes:

[0005] Multiple battery cells are arranged along a first direction;

[0006] A damping assembly is disposed on one side of one of the battery cells along the first direction, the damping assembly being connected to at least one of the battery cells for adjusting the expansion force of the plurality of battery cells;

[0007] The flexible connector is electrically connected to two adjacent battery cells.

[0008] In some embodiments, the damping component includes:

[0009] The first housing has a first receiving cavity;

[0010] The second housing is movably disposed within the first receiving cavity and partially protrudes outside the first receiving cavity;

[0011] An elastomer is disposed within the first receiving cavity and connected to both the first housing and the second housing. The elastomer is capable of driving the second housing to move within the first receiving cavity.

[0012] The first housing and / or the second housing are connected to the adjacent battery cell.

[0013] In some embodiments, the first housing has a limiting groove that extends along the first direction and communicates with the first receiving cavity; the second housing includes a limiting bolt that is slidably inserted into the limiting groove.

[0014] In some embodiments, the second housing has a second receiving cavity with its opening facing the first receiving cavity and communicating with the first receiving cavity; a portion of the elastomer is disposed within the second receiving cavity and connected to the second housing.

[0015] In some embodiments, the battery pack further includes a plurality of buffers arranged along the first direction, with a battery cell disposed between two adjacent buffers, and the battery cell being connected to two buffers respectively, the buffers being used to provide expansion gaps for the battery cell.

[0016] In some embodiments, the maximum compression of the elastomer is W, the size of the expansion gap is a, the number of the plurality of battery cells is n, the number of the plurality of buffers is m, and the average expansion thickness of the plurality of battery cells is M. t The initial compression of the elastomer is d, which satisfies:

[0017] W≥d+nM t -ma, m>n.

[0018] In some embodiments, along the first direction, the maximum compression of the elastomer is less than or equal to the maximum size of the limiting groove.

[0019] In some embodiments, the battery pack includes a plurality of the flexible connectors, the plurality of flexible connectors including a first connector, the first connector comprising:

[0020] The first connecting portion is electrically connected to one of the two adjacent battery cells;

[0021] The second connection portion is electrically connected to another of the two adjacent battery cells;

[0022] The first buffer portion is connected to the first connecting portion and the second connecting portion respectively, and the first buffer portion can extend along the first direction.

[0023] In some embodiments, the damping component is disposed between two adjacent battery cells and connected to each of the two battery cells; the plurality of flexible connectors include a second connector, the second connector comprising:

[0024] The third connection part is electrically connected to the battery cell located on one side of the damping assembly;

[0025] The fourth connection part is electrically connected to the battery cell located on the other side of the damping assembly;

[0026] The fifth connecting part is disposed between the third connecting part and the fourth connecting part along the first direction, and is disposed on one side of the damping assembly along the second direction;

[0027] The second buffer section is connected to the third connecting section and the fifth connecting section respectively;

[0028] The third buffer section is connected to the fourth connecting section and the fifth connecting section respectively;

[0029] Both the second buffer portion and the third buffer portion can extend along the first direction, and the second direction intersects with the first direction.

[0030] In some embodiments, the battery pack further includes an end plate disposed on one side of the plurality of battery cells along the first direction, and a damping assembly disposed between the end plate and the battery cells adjacent to the end plate, and the damping assembly is connected to the end plate and the battery cells respectively.

[0031] In some embodiments, the battery pack further includes a fixing member that encloses a fixed space, in which a plurality of battery cells and the damping assembly are disposed and connected to the fixing member.

[0032] Beneficial Effects: Compared with the prior art, a battery pack according to an embodiment of this application includes multiple battery cells, a damping component, and multiple flexible connectors. The multiple battery cells are arranged along a first direction, and the damping component is disposed on one side of one of the battery cells along the first direction. The damping component is connected to at least one battery cell and is used to adjust the expansion force of the multiple battery cells. At least one flexible connector is electrically connected to two adjacent battery cells. This application, by placing a damping component on one side of one of the multiple battery cells, allows the battery cell to gradually transfer the expansion force to the damping component when it expands and compresses adjacent battery cells. The damping component absorbs the expansion force, ensuring that the battery cells in the battery pack can withstand a tolerable expansion force throughout their entire lifespan, achieving uniform stress distribution throughout the battery cells' lifespan. This effectively overcomes problems such as insufficient gaps, excessive stress, and even damage to the battery pack structure caused by battery cell expansion. It greatly improves the battery's performance in the later stages of its lifespan and significantly reduces safety risks. Furthermore, this application uses flexible connectors to connect adjacent battery cells, maintaining the stability of the conductive connection even after the battery cells expand. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of a battery pack structure in which a damping component is disposed between a battery cell and an end plate, according to an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of a battery pack structure in which a damping component is disposed between two adjacent battery cells according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a damping component according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of a first housing according to an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of the connection between the second shell and the elastomer according to an embodiment of this application;

[0039] Figure 6 This is a schematic diagram of the structure of a first connector according to an embodiment of this application;

[0040] Figure 7 This is a schematic diagram of the structure of a second connector according to an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Battery cell;

[0043] 200, Damping assembly; 210, First housing; 211, First receiving cavity; 212, Limiting groove; 220, Second housing; 221, Limiting bolt; 222, Second receiving cavity; 230, Elastomer;

[0044] 300. Flexible connector; 310. First connector; 311. First connecting part; 312. Second connecting part; 313. First buffer part; 320. Second connector; 321. Third connecting part; 322. Fourth connecting part; 323. Fifth connecting part; 324. Second buffer part; 325. Third buffer part;

[0045] 400. Buffer component; 410. Expansion gap;

[0046] 500, end plate;

[0047] 600. Fasteners;

[0048] X, the first direction; Y, the second direction. Detailed Implementation

[0049] The technical solutions of 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0051] It should also be noted that this application uses an arrow labeled X to indicate the first direction X, and an arrow labeled Y to indicate the second direction Y. The first direction X is the direction in which the multiple battery cells 100 are arranged, and the second direction Y is the direction in which the battery cells 100 and the flexible connector 300 are arranged. The first direction X and the second direction Y are introduced to more easily describe the structural positional relationship of the battery pack, so as to understand the specific structure of the battery pack. In the embodiments of this application, the first direction X and the second direction Y intersect; furthermore, the first direction X and the second direction Y can be perpendicular to each other.

[0052] In related technologies, during the later stages of a lithium battery's lifespan, individual battery cells expand and thicken due to internal physicochemical changes. Furthermore, within a module or battery pack (assembly system), the degree of expansion and thickening varies among different cells in different locations. Currently, a fixed gap is maintained between battery cells within a module or battery pack (assembly system). That is, the gap reserved for each battery cell is fixed during the initial assembly stage. When some battery cells expand to a thickness exceeding the reserved gap size during the later stages of their lifespan, they experience significant resistance to expansion. This leads to structural damage to the module or battery pack, rapidly accelerating battery performance degradation and posing substantial safety risks.

[0053] In view of this, embodiments of this application provide a battery pack designed to solve the aforementioned problems.

[0054] Please refer to the following: Figure 1 and Figure 2 This application provides a battery pack including multiple battery cells 100, a damping component 200, and multiple flexible connectors 300. The multiple battery cells 100 are arranged along a first direction X. The damping component 200 is disposed on one side of one of the battery cells 100 along the first direction X. The damping component 200 is connected to at least one battery cell 100 and is used to adjust the expansion force of the multiple battery cells 100. The multiple flexible connectors 300 include at least one flexible connector 300 that is electrically connected to two adjacent battery cells 100.

[0055] In this embodiment, by providing a damping component 200 on one side of one of the multiple battery cells 100, when the battery cell 100 expands and compresses adjacent battery cells 100, the battery cell 100 can gradually transfer the expansion force to the damping component 200. The damping component 200 absorbs the expansion force, ensuring that the battery cells 100 within the battery pack can withstand manageable expansion forces throughout their entire lifespan, achieving uniform stress distribution across the battery cells 100. This effectively overcomes problems such as insufficient gaps, excessive stress, and even damage to the battery pack structure caused by the expansion of the battery cells 100. It significantly improves the battery's performance in the later stages of its lifespan and greatly reduces safety risks. Furthermore, this application uses a flexible connector 300 to connect two adjacent battery cells 100, maintaining the stability of the conductive connection of the battery cells 100 even after expansion.

[0056] In this embodiment, the battery pack may include a housing and a battery module. The battery module includes multiple battery cells 100 arranged along a first direction X, and the battery module is disposed within the housing. Alternatively, the battery pack may directly include a housing, with the multiple battery cells 100 directly arranged along the first direction X within the housing. However, an expansion gap 410 may be initially provided between adjacent batteries to provide expansion space for the battery cells 100 during charging and discharging.

[0057] It should be noted that the flexible connector 300 can be stretched along the first direction X, thereby extending the length of the flexible connector 300. The flexible connector 300 is connected to two adjacent battery cells 100. At this time, during the charging and discharging process of the battery cell 100, the battery cell 100 expands. If the reserved expansion gap 410 cannot meet the expansion thickness of the battery cell 100, the battery cell 100 may shift and deform to both sides. At this time, the flexible connector 300 is stretched and extended along the first direction X to avoid the connection between the battery cell 100 and the flexible connector 300 from failing.

[0058] It should also be noted that this application includes a damping component 200, which is connected to the battery cell 100, thereby absorbing the expansion force when the battery cell 100 expands. By setting the damping capacity of the damping component 200, the expansion force of multiple battery cells 100 can be absorbed, thereby ensuring that the multiple battery cells 100 within the battery pack have sufficient expansion space and preventing damage to battery performance caused by excessive expansion force on the battery cells 100.

[0059] Please refer to the following: Figure 3 , Figure 4 and Figure 5 In some embodiments, the damping assembly 200 includes a first housing 210, a second housing 220, and an elastomer 230. The first housing 210 has a first receiving cavity 211. The second housing 220 is movably disposed within the first receiving cavity 211 and partially protrudes outside the first receiving cavity 211. The elastomer 230 is disposed within the first receiving cavity 211 and is connected to both the first housing 210 and the second housing 220. The elastomer 230 is capable of driving the second housing 220 to move within the first receiving cavity 211. The first housing 210 and / or the second housing 220 are connected to adjacent battery cells 100.

[0060] In this embodiment, a first housing 210 is fitted over the outer side of a second housing 220, and an elastic body 230 is provided between the first housing 210 and the second housing 220. The elastic body 230 allows the second housing 220 to reciprocate within the first receiving cavity 211 of the first housing 210, thereby compressing and resetting the damping assembly 200 as a whole. This ensures that the damping assembly 200 maintains uniform force on all battery cells 100.

[0061] The elastic element can be a spring.

[0062] It should be noted that the first housing 210 and the second housing 220 are preferably metal housings, and the elastic element is a metal spring, so as to ensure the structural strength of the entire damping assembly 200.

[0063] It should also be noted that the first housing 210 and / or the second housing 220 are connected to the large surface of the battery cell 100, and the area of ​​the side of the first housing 210 and / or the second housing 220 in contact with the large surface of the battery cell 100 is preferably close to or equal to the area of ​​the large surface of the battery cell 100. Furthermore, the shape of the side of the first housing 210 and / or the second housing 220 in contact with the large surface of the battery cell 100 and the shape of the large surface of the battery cell 100 are preferably the same to ensure the uniformity of the force on the large surface of the battery cell 100 when the entire surface of the battery cell 100 is supported.

[0064] Please refer to the following: Figure 3 , Figure 4 and Figure 5 In some embodiments, the first housing 210 has a limiting groove 212 that extends along a first direction X and communicates with a first receiving cavity 211; the second housing 220 includes a limiting bolt 221 that is slidably inserted into the limiting groove 212.

[0065] In this embodiment, the limiting groove 212 and the limiting bolt 221 cooperate to limit the movement path of the second housing 220, keep the second housing 220 moving along the first direction X, and prevent the elastic body 230 from deforming in any direction other than the first direction X, thereby ensuring the service life of the damping component 200.

[0066] In this embodiment, limiting grooves 212 are provided on both sides of the first housing 210, and limiting bolts 221 are provided on both sides of the corresponding second housing 220. This can further improve the effective limiting of the movement path of the second housing 220.

[0067] In this embodiment of the application, along the second direction Y, the first housing 210 may be provided with a plurality of limiting grooves 212, and the second housing 220 may be provided with a plurality of limiting bolts 221. The plurality of limiting bolts 221 are respectively provided in the plurality of limiting grooves 212, thereby further reducing the degree of freedom of the second housing 220 and thus further maintaining the accuracy of positioning and limiting.

[0068] like Figure 5As shown, in some embodiments, the second housing 220 has a second receiving cavity 222, the opening of the second receiving cavity 222 facing the first receiving cavity 211, and the second receiving cavity 222 communicating with the first receiving cavity 211; a portion of the elastomer 230 is disposed in the second receiving cavity 222 and connected to the second housing 220.

[0069] In this embodiment of the application, a second receiving cavity 222 is provided in the second housing 220. At this time, the second receiving cavity 222 can accommodate part of the elastic member, which can increase the length of the elastic member, thereby increasing the total compression length of the elastic member, and at the same time reducing the size of the entire damping assembly 200.

[0070] In some embodiments, the battery pack further includes a plurality of buffer members 400 arranged along a first direction X, with a battery cell 100 disposed between two adjacent buffer members 400, and the battery cell 100 being connected to two buffer members 400 respectively. The buffer members 400 are used to provide an expansion gap 410 for the battery cell 100.

[0071] In this embodiment, the buffer 400 is disposed on both sides of the battery cell 100, providing an expansion gap 410 for the large surfaces on both sides of the battery cell 100. This provides sufficient space for the battery cell 100 to expand during normal charging and discharging in the initial or middle stages, preventing the battery from being subjected to excessive expansion force and maintaining the safety of the battery cell 100.

[0072] It should be noted that the buffer 400 is an elastic element that can be compressed to provide an expansion gap 410. Of course, the buffer 400 can also be a U-shaped frame structure, with a central cutout, so that the center of the large surface of the battery cell 100 does not contact the buffer 400, thus providing an expansion gap 410 for the large surface of the battery cell 100.

[0073] In some embodiments, the maximum compression of the elastomer 230 is W, the size of the expansion gap 410 is a, the number of multiple battery cells 100 is n, the number of multiple buffers 400 is m, and the average expansion thickness of the multiple battery cells 100 is M. t The initial compression of elastomer 230 is d, which satisfies:

[0074] W≥d+nM t -ma, m>n.

[0075] In this embodiment, by setting the maximum compression of the damping component 200 to be greater than or equal to the total expansion thickness of the battery cell 100 minus the sum of the expansion thicknesses of all battery cells 100, plus the initial compression of the damping component 200, it can be ensured that the damping component 200 can smoothly absorb the expansion force of all battery cells 100 in the later stages of their life cycle, thereby maintaining the safety of the battery cells 100 and the battery pack.

[0076] It should be noted that since the battery cells 100 need to be securely fixed during initial assembly, the damping assembly 200 is initially compressed to a certain extent. An expansion gap 410 is provided on the side of the battery cell 100. This expansion gap 410 of the buffer 400 can absorb part of the expansion thickness of the battery cell 100, so the damping assembly 200 does not need further compression. The damping assembly 200 only compresses further when the expansion gap 410 can no longer absorb the further expansion of the battery cell 100, thus absorbing the expansion force. This prevents the battery cell 100 from being subjected to enormous expansion force, maintains uniform expansion force on the battery cell 100, improves the safety of the battery cell 100, and consequently improves the safety of the battery pack.

[0077] It should also be noted that the expansion thickness of the multiple battery cells 100 within the battery pack may vary. Therefore, this embodiment selects multiple fresh battery cells 100 and provides an initial preload force N1. Standard charge-discharge cycles are performed until the SOH (State of Health) of the battery cells 100 reaches 80%, and the expansion rate data and large-area expansion force data of all sampled battery cells 100 are recorded during the laboratory EOL (End of Life) stage. Assuming that the average expansion rate of all sampled battery cells 100 during the EOL stage is M, and the average expansion force is N2 (taking the average value can effectively evaluate the overall expansion rate of all battery cells 100 in the EOL stage after the battery is assembled into a module or pack), and the thickness of a single battery cell 100 is t, then the theoretical average expansion thickness of a single cell during the EOL stage is: M t Furthermore, for a module or battery pack composed of n battery cells 100, the total gap required for the expansion of all battery cells 100 during the theoretical EOL stage is: nM t .

[0078] When battery cells 100 are assembled into battery modules or battery packs, in order to ensure the strength and heat insulation and flame retardant requirements of the battery modules or battery packs, gaps must be reserved between each battery cell 100. Assuming that the gap required for the single-sided buffer 400 (which can be a buffer pad or aerogel) of each battery cell 100 is a, this gap can also be used for buffering. That is, the initial reserved expansion gap 410 of the battery cell 100 is a. n battery cells 100 require m buffers 400 (m>n). Therefore, when the applied pressure is N2, the total compression (compression displacement) of the designed damping component 200 is: nMt-ma.

[0079] Furthermore, the damping component 200 is subjected to an initial preload during battery assembly, resulting in an initial compression d. Therefore, to maintain the maximum compression W of the damping component 200, it is necessary to satisfy W ≥ d + nM.t -ma, m>n.

[0080] It should also be noted that, because each battery cell 100 has a buffer 400 on both sides, and a buffer 400 is placed between two adjacent battery cells 100, and a buffer 400 is placed between the damping assembly 200 and the battery cell 100, when the damping assembly 200 is placed on one side of multiple battery cells 100, m = n + 1; when the damping assembly 200 is placed between two adjacent battery cells 100, a buffer 400 is also placed between the damping assembly 200 and the battery cell, in which case m = n + 2.

[0081] In some embodiments, along the first direction X, the maximum compression of the elastomer 230 is less than or equal to the maximum size of the limiting groove 212.

[0082] In this embodiment of the application, this structural arrangement ensures that the limiting groove 212 only provides a guiding function without affecting the compression of the elastomer 230.

[0083] like Figure 6 As shown, in some embodiments, the plurality of flexible connectors 300 include a first connector 310, the first connector 310 including a first connecting portion 311, a second connecting portion 312 and a first buffer portion 313, the first connecting portion 311 being electrically connected to one of two adjacent battery cells 100; the second connecting portion 312 being electrically connected to the other of two adjacent battery cells 100; the first buffer portion 313 being connected to the first connecting portion 311 and the second connecting portion 312 respectively, and the first buffer portion 313 being able to extend along a first direction X.

[0084] In this embodiment, the first connector 310 is used to connect with two adjacent battery cells 100. At this time, there is no damping component between the two adjacent battery cells 100. The first buffer portion 313 can extend to one side of the first connector 311 or the second connector 312, thereby extending the length of the first connector 310. This can accommodate the expansion of the battery cells 100 and prevent the connection between the first connector 310 and the battery cells 100 from breaking.

[0085] Preferably, the first connector 310 is welded to the battery cell 100.

[0086] Such as 2 and Figure 7As shown, in some embodiments, the damping component 200 is disposed between two adjacent battery cells 100 and connected to both battery cells 100 respectively; the flexible connector 300 includes a second connector 320, which includes a third connecting portion 321, a fourth connecting portion 322, a fifth connecting portion 323, a second buffer portion 324, and a third buffer portion 325. The third connecting portion 321 is electrically connected to the battery cell 100 located on one side of the damping component 200; the fourth connecting portion 322 is electrically connected to the battery cell 100 located on the other side of the damping component 200. The battery cell 100 on one side is electrically connected; the fifth connection part 323 is disposed between the third connection part 321 and the fourth connection part 322 along the first direction X, and is disposed on one side of the damping assembly 200 along the second direction Y; the second buffer part 324 is connected to the third connection part 321 and the fifth connection part 323 respectively; the third buffer part 325 is connected to the fourth connection part 322 and the fifth connection part 323 respectively; wherein, the second buffer part 324 and the third buffer part 325 can both extend along the first direction X, and the second direction Y intersects with the first direction X.

[0087] In this embodiment, the second connector 320 is used to electrically connect with the two battery cells 100 on both sides of the damping assembly 200 when the damping assembly 200 is positioned between two adjacent battery cells 100, thus ensuring the conductive connection of the entire battery pack. The second buffer portion 324 and the third buffer portion 325 can be stretched to both sides respectively, thereby maintaining an effective connection between the flexible connector 300 and the battery cells 100 when the battery shifts.

[0088] Please refer to the following: Figure 1 and Figure 2 In some embodiments, the battery pack further includes an end plate 500, which is disposed on one side of a plurality of battery cells 100 along a first direction X. A damping assembly 200 is disposed between the end plate 500 and the battery cells 100 adjacent to the end plate 500, and the damping assembly 200 is connected to the end plate 500 and the battery cells 100 respectively.

[0089] In this embodiment, the end plate 500 is configured to abut against the battery cell 100 or the damping component 200, thereby facilitating the grouping and fixing of multiple battery cells 100, maintaining the structural stability of the battery cells 100 after grouping, and facilitating the connection of the battery cells 100 grouped with the housing.

[0090] Furthermore, such as Figure 1 and Figure 2As shown, in some embodiments, the battery pack further includes fasteners 600. The fasteners 600 surround the multiple battery cells 100, the damping assembly 200, and the end plate 500, and are tightened and fixed to provide pre-tension for the battery cells 100 to be grouped together, ensuring the structural stability of the battery cells 100 after assembly. Multiple fasteners 600 may be present, spaced apart along the second direction Y, providing multiple fixing points to further improve fixing stability. Of course, the fasteners 600 can be steel strips, possessing strong structural strength and a certain degree of deformation capability.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] The battery pack provided in the embodiments of this application has been described in detail above, and 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 technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, include: Multiple battery cells are arranged along a first direction; A damping assembly is disposed on one side of one of the battery cells along the first direction, the damping assembly being connected to at least one of the battery cells for adjusting the expansion force of the plurality of battery cells; The flexible connector is electrically connected to two adjacent battery cells.

2. The battery pack of claim 1, wherein, The damping component includes: The first housing has a first receiving cavity; The second housing is movably disposed within the first receiving cavity and partially protrudes outside the first receiving cavity; An elastomer is disposed within the first receiving cavity and connected to both the first housing and the second housing. The elastomer is capable of driving the second housing to move within the first receiving cavity. The first housing and / or the second housing are connected to the adjacent battery cell.

3. The battery pack according to claim 2, characterized in that, The first housing has a limiting groove, which extends along the first direction and communicates with the first receiving cavity; The second housing includes a limiting bolt, which is slidably inserted into the limiting groove.

4. The battery pack of claim 2, wherein, The second housing has a second receiving cavity, the opening of which faces the first receiving cavity, and the second receiving cavity communicates with the first receiving cavity; a portion of the elastomer is disposed within the second receiving cavity and is connected to the second housing.

5. The battery pack according to claim 2, characterized in that, The battery pack also includes multiple buffers arranged along the first direction, with a battery cell disposed between two adjacent buffers, and the battery cell being connected to two buffers respectively. The buffers are used to provide expansion gaps for the battery cells.

6. The battery pack according to claim 5, characterized in that, The maximum compressibility of the elastomer is W, the size of the expansion gap is a, the number of the multiple battery cells is n, the number of the multiple buffer components is m, and the average expansion thickness of the multiple battery cells is M. t The initial compression of the elastomer is d, which satisfies: W≥d+nM t -ma,m>n。 7. The battery pack of claim 3, wherein, Along the first direction, the maximum compression of the elastomer is less than or equal to the maximum size of the limiting groove.

8. The battery pack according to claim 1, characterized in that, The battery pack includes a plurality of flexible connectors, and the plurality of flexible connectors includes a first connector, the first connector comprising: The first connecting portion is electrically connected to one of the two adjacent battery cells; The second connection portion is electrically connected to another of the two adjacent battery cells; The first buffer portion is connected to the first connecting portion and the second connecting portion respectively, and the first buffer portion can extend along the first direction.

9. The battery pack of claim 8, wherein, The damping component is disposed between two adjacent battery cells and connected to each of the two battery cells; the plurality of flexible connectors include a second connector, the second connector comprising: The third connection part is electrically connected to the battery cell located on one side of the damping assembly; The fourth connection part is electrically connected to the battery cell located on the other side of the damping assembly; The fifth connecting part is disposed between the third connecting part and the fourth connecting part along the first direction, and is disposed on one side of the damping assembly along the second direction; The second buffer section is connected to the third connecting section and the fifth connecting section respectively; The third buffer section is connected to the fourth connecting section and the fifth connecting section respectively; Both the second buffer portion and the third buffer portion can extend along the first direction, and the second direction intersects with the first direction.

10. The battery pack of claim 1, wherein, It also includes an end plate, which is disposed on one side of the plurality of battery cells along the first direction, and the damping assembly is disposed between the end plate and the battery cells adjacent to the end plate, and the damping assembly is connected to the end plate and the battery cells respectively.

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