Battery pack

Abstract

A battery pack comprises a box body and a battery cell, and a first plate and a second plate of the box body in a first direction can change positions relatively so as to provide accommodating spaces with different sizes; the battery cell is positioned between the first plate and the second plate, so that the battery cell is accommodated between the first plate and the second plate, and through the arrangement, the first plate and the second plate move relatively to provide different accommodating distances so as to adapt to the battery cells with different sizes and numbers; meanwhile, the battery cell is clamped by the first plate and the second plate, so that the performance of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and particularly relates to a battery pack. Background Art

[0002] In the design of battery packs, in order to meet the requirements of different application scenarios for battery capacity, different numbers of battery cells are usually used. However, traditional battery pack designs often adopt a fixed structure, which makes it impossible for them to flexibly adapt to changes in the size and number of battery cells. In addition, during the use of battery packs, in order to ensure the performance of battery cells, it is usually necessary to clamp the battery cells to maintain good contact between the battery cells. However, traditional fixed battery packs cannot achieve an effective clamping function when the number or size of battery cells changes, resulting in a decline in the performance of battery cells. Summary of the Utility Model

[0003] The purpose of this application is to provide a battery pack to solve the problem of the adaptation of the battery pack to battery cells.

[0004] To achieve the purpose of this application, the following technical solutions are provided in this application:

[0005] The present utility model provides a battery pack, including: a box body and battery cells, the box body includes a first plate and a second plate that are opposite in a first direction; the battery cells are housed in the box body, and the battery cells are located between the first plate and the second plate; along the first direction, the first plate is movable to approach or move away from the second plate.

[0006] In one embodiment, along the first direction, the second plate is movable to approach or move away from the first plate.

[0007] In one embodiment, the box body further includes a third plate and a fourth plate, the first plate, the third plate, the second plate, and the fourth plate are sequentially connected in a ring shape, and the first plate is movably connected to the third plate and the fourth plate respectively.

[0008] In one embodiment, the first plate includes a first engaging portion and a second engaging portion, the third plate includes a third engaging portion, the fourth plate includes a fourth engaging portion, the first engaging portion is engaged and connected with the third engaging portion, and the second engaging portion is engaged and connected with the fourth engaging portion.

[0009] In one embodiment, the first plate further includes a plate body, the third engaging portion is a first hole, the fourth engaging portion is a second hole, the first engaging portion protrudes from the surface of the plate body facing the second plate to extend into the first hole, and the second engaging portion protrudes from the surface of the plate body facing the second plate to extend into the second hole.

[0010] In one embodiment, a third hole and a fourth hole are formed in the plate body, the first engaging portion extends into the third hole from a side of the plate body facing away from the second plate, and the second engaging portion extends into the fourth hole from a side of the plate body facing away from the second plate.

[0011] In one embodiment, both the first engaging portion and the second engaging portion have threads, the first engaging portion is threadedly engaged with the first hole and the third hole respectively, and the second engaging portion is threadedly engaged with the second hole and the fourth hole respectively.

[0012] In one embodiment, the number of the first engaging portions and the third engaging portions is plural, and the number of the second engaging portions and the fourth engaging portions is plural.

[0013] In one embodiment, the first plate includes at least two first engaging groups, each first engaging group includes at least one first engaging portion, the plurality of first engaging groups are arranged at intervals in a second direction, the first plate includes at least two second engaging groups, each second engaging group includes at least one second engaging portion, the plurality of second engaging groups are arranged at intervals in the second direction, and the second direction intersects with the first direction.

[0014] In one embodiment, the third plate includes a first sub-plate and a second sub-plate; along the first direction, one ends of the first sub-plate and the second sub-plate are connected to the first plate, and the other ends of the first sub-plate and the second sub-plate facing away from each other are connected to the second plate; the fourth plate includes a third sub-plate and a fourth sub-plate; along the first direction, one ends of the third sub-plate and the fourth sub-plate are connected to the first plate, and the other ends of the third sub-plate and the fourth sub-plate facing away from each other are connected to the second plate.

[0015] The present utility model provides a battery pack, which includes a box body and an electric core. The first plate and the second plate of the box body in a first direction can relatively change positions to provide different sizes of accommodation intervals; the electric core is located between the first plate and the second plate, so that the electric core is accommodated between the first plate and the second plate. Through the above arrangement, the first plate and the second plate move relatively to provide different sizes of accommodation intervals to adapt to different numbers of electric cores with different sizes; at the same time, the electric core is clamped by the first plate and the second plate to improve the performance of the electric core. Description of the Drawings

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic diagram of a battery pack of an embodiment;

[0018] Figure 2 is a schematic diagram of another battery pack of an embodiment.

[0019] Description of the reference numerals:

[0020] 1 - First plate, 11 - First mating portion, 12 - Second mating portion, 13 - Plate body;

[0021] 2 - Second plate;

[0022] 3 - Third plate, 31 - First sub - plate, 32 - Second sub - plate, 33 - Third mating portion;

[0023] 4 - Fourth plate, 41 - Fourth mating portion, 42 - Third sub - plate, 43 - Fourth sub - plate;

[0024] X - First direction, Z - Second direction, Y - Third direction. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0027] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the present application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more of the related listed items.

[0028] Next, some embodiments of the present application will be described in detail in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] The present utility model provides a battery pack. Please refer to Figure 1, including a box body and an electric core. The box body includes a first plate 1 and a second plate 2 that are opposite in the first direction X; the electric core is housed in the box body and is located between the first plate 1 and the second plate 2; along the first direction X, the first plate 1 is movable to approach or move away from the second plate 2.

[0030] There is a spacing between the first plate 1 and the second plate 2 of the box body that are oppositely arranged in the first direction X to house the electric core; provide physical protection for the electric core to prevent the electric core from being directly impacted, squeezed or penetrated by the external environment, thereby avoiding damage to the electric core; fix the position of the electric core to ensure that the electric core will not shift inside the battery pack due to vibration, impact or other external forces, and maintain the stability of the internal structure of the battery pack.

[0031] It should be understood that multiple parallel single electric cores are housed between the first plate 1 and the second plate 2; the single electric core can be a lithium-ion electric core and a sodium-ion electric core; it can also be a solid-state electric core and a liquid-state electric core.

[0032] The direction in which multiple single electric cores are arranged in sequence along the first direction X, that is, the arrangement direction of the electric cores. The first plate 1 is movable to approach or move away from the second plate 2. The relative movement of the first plate 1 and the second plate 2 in the first direction X causes the spacing between the first plate 1 and the second plate 2 to change, and the box body can accommodate different numbers and different sizes of electric cores according to actual needs.

[0033] In one embodiment, the first plate 1 is movable to approach or move away from the second plate 2; a sliding structure is adopted, and the first plate 1 is matched with a slide rail through a slider and can slide on the slide rail to achieve approaching or moving away from the second plate 2.

[0034] In one embodiment, the first plate 1 is movable to approach or move away from the second plate 2; a rotating structure is adopted, and through the cooperation of a screw rod and a screw nut, rotating the screw rod can make the screw nut move along the screw rod, thereby changing the position of the first plate 1.

[0035] In one embodiment, the first plate 1 is movable to approach or move away from the second plate 2; an elastic structure is adopted, using a spring or other elastic members, and the first plate 1 is pushed to move by compressing or stretching the elastic element.

[0036] It should be understood that multiple parallel single cells are accommodated between the first plate 1 and the second plate 2; the thickness of the multiple parallel single cells is greater than the distance between the first plate 1 and the second plate 2; so that the first plate 1 and the second plate 2 can clamp the multiple parallel single cells through physical contact. The first plate 1 and the second plate 2 are relatively close. When the two plates contact the cell, the outermost cells are in physical contact with the first plate 1 and the second plate 2, and the first plate 1 and the second plate 2 apply pressure to the cells, thereby achieving clamping. Through clamping, the cells are fixed between the first plate 1 and the second plate 2, not easily displaced, improving the stability and safety of the battery pack; more cells can be accommodated in a limited space, thereby improving the energy density and space utilization rate of the battery pack.

[0037] In some embodiments of the present invention, the cell is a solid-state cell, different from the existing liquid electrolyte, and the solid-state cell uses a solid electrolyte. The liquid electrolyte can be completely infiltrated with the positive and negative electrode materials to achieve good interfacial contact; while the solid contact between the solid electrolyte and the positive and negative electrode materials will cause incomplete infiltration, resulting in insufficient interfacial contact and low ion transport efficiency. The present invention clamps the solid-state cell through the relative movement of the first plate 1 and the second plate 2. On the one hand, the solid-state cell can be fixed between the first plate 1 and the second plate 2, not easily displaced, improving the stability and safety of the battery pack; on the other hand, clamping the solid-state cell to make the positive and negative electrode materials and the solid electrolyte have good physical contact, reducing the interfacial resistance and improving the ion transport efficiency.

[0038] The present invention provides a battery pack, including a box body and cells. The first plate 1 and the second plate 2 of the box body in the first direction X can change their positions relatively to provide different accommodation spacings of different sizes; the cells are located between the first plate 1 and the second plate 2, so that the cells are accommodated between the first plate 1 and the second plate 2. Through the above settings, the first plate 1 and the second plate 2 move relatively to provide different accommodation spacings of different sizes to adapt to different numbers and sizes of cells; at the same time, the cells are clamped by the first plate 1 and the second plate 2 to improve the performance of the battery module.

[0039] In one implementation, along the first direction X, the second plate 2 is movable to approach or move away from the first plate 1.

[0040] The second plate 2 is movable along the first direction X, and the first plate 1 is fixed to approach or move away from the first plate 1. The relative movement of the first plate 1 and the second plate 2 in the first direction X forms different accommodation spacings, so that the box body can accommodate different numbers and different sizes of cells according to actual needs.

[0041] In one implementation, both the first plate 1 and the second plate 2 are movable along the first direction X to form different accommodation spacings.

[0042] In one implementation, please refer to Figure 1 , the box body further includes a third plate 3 and a fourth plate 4. The first plate 1, the third plate 3, the second plate 2, and the fourth plate 4 are sequentially connected in a ring shape, and the first plate 1 is movably connected to the third plate 3 and the fourth plate 4 respectively.

[0043] By sequentially connecting the first plate 1, the third plate 3, the second plate 2, and the fourth plate 4 in a ring shape, a closed box body is formed. The box body closed on all sides can provide a relatively enclosed environment, effectively protecting the internal battery cells from the influence of external environmental factors. At the same time, it can provide higher mechanical strength and stability, and can better protect the internal battery cells from being damaged. The first plate 1 is movably connected to the third plate 3 and the fourth plate 4 respectively. By moving the first plate 1, the size of the accommodation space inside the box body can be adjusted to adapt to different numbers and different sizes of battery cells. The movable connection is convenient for opening the box body for maintenance, inspection, or replacement of the battery cells. It supports the construction of modular battery packs, facilitating assembly and upgrade. The movable connection between the first plate 1 and the third plate 3 and the fourth plate 4 can be a sliding connection by setting a slide rail and a slider, a screw drive by a screw rod and a screw nut, a hinge connection by connecting the first plate 1 to the third plate 3 and the fourth plate 4 with a hinge, or an elastic movable connection using a spring or an elastic member.

[0044] It should be understood that the first plate 1, the third plate 3, the second plate 2, and the fourth plate 4 are sequentially connected in a ring shape to form an accommodation space, and the first plate 1 is movably connected to clamp the battery cells inside the accommodation space; the formed accommodation space is an open space, that is, there is no mounting plate at the top and bottom of the box body. On the premise of meeting the strength requirements, the material consumption can be reduced, thereby reducing the weight and increasing the energy density per unit weight; and it is beneficial to heat dissipation.

[0045] In one implementation, the first plate 1 includes a first fitting portion 11 and a second fitting portion 12, the third plate 3 includes a third fitting portion 33, and the fourth plate 4 includes a fourth fitting portion 41. The first fitting portion 11 of the first plate 1 is fitted and connected to the third fitting portion 33, and the second fitting portion 12 is fitted and connected to the fourth fitting portion 41.

[0046] The first fitting portion 11 of the first plate 1 is fitted and connected to the third fitting portion 33 of the third plate 3, and the second fitting portion 12 of the first plate 1 is fitted and connected to the fourth fitting portion 41 of the fourth plate 4. Thus, the first plate 1 can be movably connected to the third plate 3 and the fourth plate 4 respectively. Thus, the size of the accommodation space inside the box body can be adjusted to adapt to different numbers and different sizes of battery cells. The fitting connection between the fitting portions facilitates the assembly and maintenance of the box body: the design of the fitting connection facilitates the rapid assembly and disassembly of the box body, facilitating the maintenance and replacement of the internal battery cells. It improves the reusability: allows the box body to be easily disassembled and reassembled when necessary, improving the reusability of the battery pack.

[0047] In one embodiment, the first engaging portion 11 and the third engaging portion 33 may be a mutually matching snap structure. By pressing or rotating them, the first plate 1 is respectively and movably connected to the third plate 3 and the fourth plate 4. Similarly, the second engaging portion 12 and the fourth engaging portion 41 may also be mutually matching snaps.

[0048] In one embodiment, the first engaging portion 11 and the third engaging portion 33 may be a hole and a corresponding pin. By inserting and locking, the first plate 1 is respectively and movably connected to the third plate 3 and the fourth plate 4. The same applies to the second engaging portion 12 and the fourth engaging portion 41.

[0049] In one embodiment, the first engaging portion 11 may be an internal thread, and the third engaging portion 33 is an external thread screw. By rotating the screw, the first plate 1 is respectively and movably connected to the third plate 3 and the fourth plate 4. Similarly, the second engaging portion 12 and the fourth engaging portion 41 may also be a thread fit.

[0050] In one embodiment, the first engaging portion 11 and the third engaging portion 33 may contain magnetic materials, and the connection is achieved through magnetic attraction. Similarly, the second engaging portion 12 and the fourth engaging portion 41 may also contain magnetic materials.

[0051] In one embodiment, the first plate 1 further includes a plate body 13. The third engaging portion 33 is a first hole, and the fourth engaging portion 41 is a second hole. The first engaging portion 11 protrudes from the side of the plate body 13 facing the second plate 2 to extend into the first hole, and the second engaging portion 12 protrudes from the side of the plate body 13 facing the second plate 2 to extend into the second hole.

[0052] The plate body 13 is the main body of the first plate 1, which is in direct contact with the battery cell, generates a certain pressure, helps to fix the position of the battery cell, and prevents the displacement of the battery cell caused by vibration or impact during the use of the battery pack; provides physical support for the battery cell, protects the battery cell from external impact and pressure, and enhances the overall structural strength of the battery pack; at the same time, squeezes the battery cell, and when the battery cell is a solid electrolyte battery cell, the charge and discharge performance of the battery cell is better.

[0053] The first engaging portion 11 extends into the first hole through its protruding structure to realize the movable connection between the first plate 1 and the third plate 3. The second engaging portion 12 extends into the second hole through its protruding structure to realize the movable connection between the first plate 1 and the fourth plate 4. Thus, the size of the accommodation space in the box is adjusted to adapt to different numbers and different sizes of battery cells.

[0054] In one embodiment, a third hole and a fourth hole are formed in the plate body 13. The first engaging portion 11 extends into the third hole from the side of the plate body 13 facing away from the second plate 2, and the second engaging portion 12 extends into the fourth hole from the side of the plate body 13 facing away from the second plate 2.

[0055] The third hole and the fourth hole penetrating the plate body 13 are formed on the plate body 13. The first fitting portion 11 extends into the third hole from the side of the plate body 13 facing away from the second plate 2. By extending into the third hole, the first fitting portion 11 realizes the movable connection between the first plate 1 and the second plate 2; the second fitting portion 12 extends into the fourth hole from the side of the plate body 13 facing away from the second plate 2, realizing the movable connection between the first plate 1 and the third plate 3; thereby adjusting the size of the accommodation space in the box body to adapt to different numbers and different sizes of battery cells.

[0056] The methods for forming the third hole and the fourth hole on the plate body 13 can be drilling, stamping, and laser cutting. It can also be that the plate body 13 is integrally formed with the third hole and the fourth hole.

[0057] In one embodiment, both the first fitting portion 11 and the second fitting portion 12 have threads. The first fitting portion 11 is in threaded engagement with the first hole and the third hole respectively, and the second fitting portion 12 is in threaded engagement with the second hole and the fourth hole respectively.

[0058] Both the first fitting portion 11 and the second fitting portion 12 have threads. It can be understood that the first fitting portion 11 and the second fitting portion 12 are screws. The first fitting portion 11 is in threaded engagement with the first hole and the third hole respectively. It needs to be understood that threads are provided in both the first hole and the third hole, so that the threads on the first fitting portion 11 cooperate with the threads in the first hole and the third hole. By rotating the first fitting portion 11, the first plate 1 is movably connected to the third plate 3; threads are provided in both the second hole and the fourth hole, so that the threads on the second fitting portion 12 cooperate with the threads in the second hole and the fourth hole. By rotating the second fitting portion 12, the first plate 1 is movably connected to the fourth plate 4.

[0059] In one embodiment, the number of both the first fitting portion 11 and the third fitting portion 33 is multiple, and the number of both the second fitting portion 12 and the fourth fitting portion 41 is multiple.

[0060] The number of the first fitting portion 11, the second fitting portion 12, the third fitting portion 33, and the fourth fitting portion 41 is all set to be multiple. It can be but is not limited to 2, 3, 4, and 5. Multiple fitting portions can disperse the load generated during connection, reduce the pressure borne by a single fitting portion, thereby improving the stability and durability of the connection. It can also provide redundant connection. When some of the fitting portions fail or are damaged, the other fitting portions can still maintain the structural stability of the box body. It can be understood that the number of the first fitting portion 11 and the second fitting portion 12 is the same, and the number of the third fitting portion 33 and the fourth fitting portion 41 is the same.

[0061] In one embodiment, the number of the first fitting portion 11 and the second fitting portion 12 is the same.

[0062] The first mating part 11 and the second mating part 12 are both arranged on the plate body 13. The number of the first mating parts 11 and the second mating parts 12 is the same. The same number of mating parts can ensure the formation of a uniform connection distribution between the first plate 1 and the second plate 2, maintain the structural symmetry of the box body, and help to maintain the balance and stability of the box body. The same number of mating parts can optimize the material and production costs; the same number of mating parts makes the assembly of the box body simpler, easier to match the mating parts, reduces assembly errors, and saves labor costs.

[0063] In one embodiment, the first plate 1 includes at least two first mating groups. Any one of the first mating groups includes at least one first mating part 11. The multiple first mating groups are arranged at intervals along the second direction Z. The first plate 1 includes at least two second mating groups. Any one of the second mating groups includes at least one second mating part 12. The multiple second mating groups are arranged at intervals along the second direction Z. The second direction Z intersects with the first direction X.

[0064] The at least two first mating groups are arranged at intervals along the second direction Z. Each first mating group includes at least one first mating part 11, forming a certain spacing on the plate body 13, which helps to ensure the uniform stress of the battery cells inside the battery pack, improve the structural stability and safety. Enhance the structural strength of the box body, so that the battery cells are supported in multiple directions. The reason for setting the second mating group is the same and will not be elaborated here. It can be understood that in some embodiments, the second direction Z is perpendicular to the first direction X.

[0065] In one embodiment, please refer to Figure 1 and Figure 2 , the third plate 3 includes a first sub - plate 31 and a second sub - plate 32; along the first direction X, one end of the first sub - plate 31 and the second sub - plate 32 is connected to the first plate 1, and the other ends of the first sub - plate 31 and the second sub - plate 32 facing away from each other are connected to the second plate 2; the fourth plate 4 includes a third sub - plate 42 and a fourth sub - plate 43; along the first direction X, one end of the third sub - plate 42 and the fourth sub - plate 43 is connected to the first plate 1, and the other ends of the third sub - plate 42 and the fourth sub - plate 43 facing away from each other are connected to the second plate 2.

[0066] The third plate 3 includes a first sub - plate 31 and a second sub - plate 32. By dividing the third plate 3 into the first sub - plate 31 and the second sub - plate 32, there is a gap between the first sub - plate 31 and the second sub - plate 32; it can reduce the material usage on the premise of meeting the strength requirements, thereby reducing the weight and increasing the energy density per unit weight; and the battery cells are directly exposed, which is beneficial to the heat dissipation of the battery cells.

[0067] The reason for the fourth plate 4 including the third sub - plate 42 and the fourth sub - plate 43 is the same as that of the first sub - plate 31 and the second sub - plate 32 and will not be elaborated here.

[0068] It can be understood that the first sub-board 31 and the third sub-board 42 are oppositely arranged in the third direction Y, and the second sub-board 32 and the fourth sub-board 43 are oppositely arranged in the third direction Y.

[0069] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0070] The above-disclosed is only a preferred embodiment of the present application. Of course, it cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A battery pack, characterized in that: include: The box body includes a first plate and a second plate opposite to each other in a first direction; A battery cell is contained in the box, and the battery cell is located between the first plate and the second plate; Along the first direction, the first plate is movable to move closer to or farther from the second plate.

2. The battery pack according to claim 1, characterized in that: The second plate is movable along the first direction to move closer to or farther from the first plate.

3. The battery pack according to claim 1, characterized in that: The box body also includes a third plate and a fourth plate. The first plate, the third plate, the second plate and the fourth plate are connected in sequence in a ring shape. The first plate is movably connected to the third plate and the fourth plate respectively.

4. The battery pack according to claim 3, characterized in that: The first plate includes a first matching portion and a second matching portion, the third plate includes a third matching portion, the fourth plate includes a fourth matching portion, the first matching portion is matched and connected with the third matching portion, and the second matching portion is matched and connected with the fourth matching portion.

5. The battery pack according to claim 4, characterized in that: The first plate also includes a plate body, the third matching portion is a first hole, the fourth matching portion is a second hole, the first matching portion protrudes from one side of the plate body toward the second plate to extend into the first hole, and the second matching portion protrudes from one side of the plate body toward the second plate to extend into the second hole.

6. The battery pack according to claim 5, characterized in that: The plate body is provided with a third hole and a fourth hole, the first matching portion extends into the third hole from a side of the plate body facing away from the second plate, and the second matching portion extends into the fourth hole from a side of the plate body facing away from the second plate.

7. The battery pack according to claim 6, characterized in that: The first matching portion and the second matching portion both have threads, the first matching portion is respectively connected to the first hole and the third hole by threaded matching, and the second matching portion is respectively connected to the second hole and the fourth hole by threaded matching.

8. The battery pack according to claim 4, characterized in that: The number of the first matching portion and the number of the third matching portion are both plural, and the number of the second matching portion and the number of the fourth matching portion are both plural.

9. The battery pack according to claim 8, characterized in that: The first plate includes at least two first matching groups, any one of the first matching groups includes at least one first matching part, and multiple first matching groups are arranged at intervals along the second direction. The first plate includes at least two second matching groups, any one of the second matching groups includes at least one second matching part, and multiple second matching groups are arranged at intervals along the second direction, and the second direction intersects with the first direction.

10. The battery pack according to claim 4, characterized in that: The third board includes a first sub-board and a second sub-board; along the first direction, one end of the first sub-board and the second sub-board is connected to the first board, and the other end of the first sub-board and the second sub-board facing away from each other is connected to the second board; the fourth board includes a third sub-board and a fourth sub-board; along the first direction, one end of the third sub-board and the fourth sub-board is connected to the first board, and the other end of the third sub-board and the fourth sub-board facing away from each other is connected to the second board.

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