Battery pack

Abstract

The utility model provides a battery pack, which comprises: a battery cell group module, which comprises a plurality of battery cell stacking bodies, a plurality of connecting beams and two side plate groups, the plurality of battery cell stacking bodies are arranged along a first direction, and each battery cell stacking body comprises a plurality of battery cells stacked along a second direction; connecting beams are arranged at the two ends, distributed in the first direction, of each battery cell stacking body; the side plate groups are located on the two sides, distributed in the second direction, of the battery cell stacking body, and the side plate groups are connected with the battery cell stacking body through the connecting beams and clamp and fix the battery cell stacking body; the battery cell group module is connected to the box body; the sliding plate assembly is arranged between the battery cell stacking body and the box body, the sliding plate assembly comprises a plurality of supporting pieces, each supporting piece supports part of the battery cells in the battery cell stacking body, and the supporting pieces can move relative to the box body in the second direction along with expansion or contraction of the battery cells. According to the battery pack provided by the invention, when the battery cells expand, the supporting pieces move along with the battery cells, so that the expansion stress in the battery cell stacking body is released, and the service life of the battery cells is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more particularly to a battery pack. Background Technology

[0002] A battery pack can contain multiple cell groups, each cell group comprising multiple stacked cells. In related technologies, the cell groups are housed within the battery pack's casing, and the cells are bonded to the casing's base plate. During charging and discharging, the cells expand and deform. However, because the cells are firmly bonded to the casing's base plate, the expansion stress is not easily released, and the mutual compression between the cells may adversely affect their electrical performance. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack that at least partially solves the problem of difficulty in releasing expansion stress caused by the battery cells being firmly fixed to the bottom plate of the casing.

[0004] Based on the above objectives, a first aspect of this application provides a battery pack, comprising: a cell assembly module, including multiple cell stacks, multiple connecting beams, and two side plate assemblies, wherein the multiple cell stacks are arranged along a first direction, and each cell stack includes multiple cells stacked along a second direction; the connecting beams are arranged at both ends of each cell stack along the first direction; the two side plate assemblies are located on both sides of the cell stack along the second direction, and the two side plate assemblies are connected and clamped to fix the cell stack by the connecting beams; a housing, wherein the cell assembly module is connected to the housing; and a sliding plate assembly disposed between the cell stacks and the housing, wherein the sliding plate assembly includes multiple support members, each support member supporting a portion of the cells in the cell stack, and the support member is movable relative to the housing along the second direction as the cells expand or contract.

[0005] Optionally, the skateboard assembly further includes a guide rail located below the support member and extending along the second direction; the support member slides in conjunction with the guide rail.

[0006] Optionally, the bottom of the support member is provided with a guide groove, which extends through the side wall of the support member along the second direction; along the height direction of the slide plate assembly, the guide rail portion is disposed within the guide groove.

[0007] Optionally, the guide groove is a dovetail groove, and the cross-sectional shape of the guide rail is adapted to the guide groove.

[0008] Optionally, the skateboard assembly may further include rollers disposed between the support member and the guide rail.

[0009] Optionally, the bottom of the support member is provided with a guide groove; the top of the guide rail is provided with a receiving groove, which extends along the second direction; the roller is installed in the receiving groove and abuts against the bottom of the receiving groove and the bottom of the guide groove, respectively.

[0010] Optionally, each of the skateboard assemblies includes a plurality of guide rails, which are evenly spaced along the first direction; and / or, the two ends of each guide rail are respectively connected to two of the side plate assemblies in a one-to-one correspondence.

[0011] Optionally, the side plate assembly is connected to an elastic component on the side near the cell stack; the elastic component is capable of extending and retracting along the second direction and abutting against the end surface of the cell stack; and / or, the sliding plate assembly corresponds one-to-one with the cell stack; and / or, each sliding plate assembly includes a plurality of support members arranged along the second direction, and each cell in the cell stack is supported by a corresponding support member.

[0012] Optionally, the top of the support member is provided with a support surface, the support surface including a flat first region and an upwardly inclined second region; the second region is located on opposite sides of the first region along the second direction.

[0013] Optionally, the support member includes a support plate and a guide block connected to the bottom of the support plate; the support plate has a plate-like structure, and the top surface of the support plate is configured as the support surface; and / or, the guide block is provided with a guide groove for cooperating with a guide rail, and the guide groove extends along the height direction of the slide assembly to the bottom of the support plate.

[0014] Optionally, each of the side plate groups includes a plurality of side plate segments distributed along the first direction and detachably connected. The side plate segments located on both sides of the same cell stack are detachably connected to the connecting beams located at both ends of the corresponding cell stack and clamp and fix the cell stack when connected.

[0015] Optionally, the cell assembly module further includes a battery management system, which includes multiple slave control boards. Each side panel segment is equipped with a slave control board, and the slave control board is electrically connected to the cell stack corresponding to the side panel segment.

[0016] Optionally, the battery cell includes a pouch cell.

[0017] Optionally, the housing includes a plate-shaped lower housing, and the side panel assembly is connected to the lower housing by fasteners.

[0018] As can be seen from the above, the battery pack provided in this application allows the cell assembly module to be directly connected to the housing, and the two side plates in the cell assembly module clamp and fix the cell stack, thereby ensuring that the cells in the cell stack can be reliably connected to the housing. A sliding plate assembly is provided below the cells stacked along the second direction. The sliding plate assembly includes a support member that supports the cells and can move along the second direction. When the cell supported by the support member is subjected to expansion stress from other cells in the cell stack, the support member moves relative to the housing along with the stressed cell, thereby releasing the expansion stress within the cell stack, reducing the damage to the cells caused by the expansion stress, and helping to improve the lifespan of the cells and the safety of the battery pack.

[0019] Meanwhile, this application eliminates the process of assembling battery cells into battery modules, which not only reduces the number of battery pack components and material costs, simplifies the assembly process, and improves assembly efficiency, but also helps to increase the energy density of the battery pack. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a partial schematic diagram of a battery pack according to an embodiment of this application;

[0022] Figure 2 This is a partial exploded view of the battery pack according to an embodiment of this application;

[0023] Figure 3 This is a partial front-view cross-sectional view of the battery pack according to an embodiment of this application;

[0024] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the diagram;

[0025] Figure 5 This is a partially exploded first-view schematic diagram of the sliding plate assembly of the battery pack according to an embodiment of this application.

[0026] Figure 6 This is a partial bottom view schematic diagram of the battery pack according to an embodiment of this application;

[0027] Figure 7 This is a partial side view cross-sectional diagram of the battery pack according to an embodiment of this application;

[0028] Figure 8 for Figure 7 Enlarged schematic diagram of part B in the middle;

[0029] Figure 9 This is a partially exploded second view of the slide plate assembly of the battery pack according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1000, Cell assembly module; 100, Cell stack; 110, Cell; 200, Elastic component; 300, Side plate assembly; 310, Side plate segment; 400, Connecting beam;

[0032] 2000, enclosure; 2100, lower enclosure;

[0033] 3000, Fasteners;

[0034] 4000, Slide assembly; 4100, Support piece; 4110, Pad; 4120, Guide block; 4121, Guide groove; 4130, Support surface; 4131, First area; 4132, Second area; 4200, Guide rail; 4210, Receiving groove; 4300, Roller;

[0035] 5000, adhesive layer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0037] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0038] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0040] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] Figure 1 A partial schematic diagram of a battery pack is shown, such as Figure 1 The battery pack includes a housing 2000, which includes a plate-shaped lower housing 2100. The lower housing 2100 supports a cell stack 100, which includes multiple cells 110 stacked together.

[0042] To ensure that the cell stack 100 can be reliably fixed within the housing 2000, such as Figure 1 In some embodiments, an adhesive layer 5000 (e.g., structural adhesive) is provided between the lower housing 2100 and the cell stack 100 so that the cell 110 is connected to the lower housing 2100 through the adhesive layer 5000.

[0043] When the cell 110 expands, if the expansion stress it generates can push the adjacent cells 110 to move, so as to form a space sufficient to accommodate the expanded and deformed cells 110, then the expansion stress can be released.

[0044] However, since the cells 110 in the cell stack 100 cannot move, when the cells 110 expand, the resulting expansion stress is difficult to release by pushing adjacent cells 110, and will only cause the cells 110 to squeeze each other.

[0045] Figure 2 An explosion diagram of a battery pack is shown.

[0046] To solve the above problems, such as Figure 2 In some embodiments, the battery pack includes: a cell assembly module 1000, comprising a plurality of cell stacks 100, a plurality of connecting beams 400, and two side plate assemblies 300, the plurality of cell stacks 100 being arranged along a first direction (e.g., Figure 2The cells are arranged in the X direction, and each cell stack 100 includes multiple cells arranged along the second direction (e.g., the X direction). Figure 2 The battery cells 110 are stacked in the Y direction. Each battery cell stack 100 has a connecting beam 400 at both ends distributed along the first direction. Two side plate groups 300 are located on both sides of the battery cell stack 100 distributed along the second direction. The two side plate groups 300 are connected and clamped to fix the battery cell stack 100 by the connecting beam 400. A housing 2000 is provided, and the battery cell module 1000 is connected to the housing 2000. A sliding plate assembly 4000 is provided between the battery cell stack 100 and the housing 2000. The sliding plate assembly 4000 includes multiple support members 4100. Each support member 4100 supports a portion of the battery cells 110 in the battery cell stack 100, and the support member 4100 can move relative to the housing 2000 along the second direction as the battery cells 110 expand or contract.

[0047] For example, the battery cell module 1000 can be connected to the housing 2000 by means of plug-in, snap-in, adhesive connection, welding or bolt connection.

[0048] For example, the connecting beam 400 can be connected to the side plate assembly 300 by means of plug-in, snap-fit, or bolt connection.

[0049] For example, the support member 4100 may directly contact the lower housing 2100, or other structural members may be provided between the support member 4100 and the lower housing 2100, which may slide in cooperation with at least one of the support member 4100 and the lower housing 2100.

[0050] For example, each support member 4100 supports at least one battery cell 110.

[0051] For example, the top surface of the support 4100, i.e. the surface used to support the cell 110, can be a flat surface or a curved surface.

[0052] For example, a buffer layer capable of stretching and contracting along a second direction may be provided between adjacent cells 110 in the same cell stack 100.

[0053] For example, the slide plate assembly 4000 can be connected to the side plate assembly 300 and / or the housing 2000 without hindering the movement of the support member 4100.

[0054] The two side plate assemblies 300 and the connecting beam 400 can be constructed into a frame structure. The connecting beam 400 can provide tension to the two side plate assemblies 300 so that the two side plate assemblies 300 can clamp and fix the cell stack 100.

[0055] In conjunction with the foregoing, when a cell 110 in the cell stack 100 expands and deforms, the expanded cell 110 can apply expansion stress to adjacent cells 110. In this embodiment, when the cell 110 supported by the support member 4100 is subjected to expansion stress, the stressed cell 110 can move the support member 4100 together, thereby releasing the expansion stress.

[0056] In this embodiment, the battery pack cell module 1000 can be directly connected to the housing 2000, and the two side plate groups 300 in the cell module 2000 clamp and fix the cell stack 100, thereby ensuring that the cells 110 in the cell stack 100 can be reliably connected to the housing 2000.

[0057] A slide plate assembly 4000 is disposed below the battery cells 110 stacked along the second direction. The slide plate assembly 4000 includes a support member 4100 that supports the battery cells 110 and is movable along the second direction. When the battery cell 110 supported by the support member 4100 is subjected to expansion stress by other battery cells 110 in the battery cell stack 100, the support member 4100 will move together with the stressed battery cell 110, thereby releasing the expansion stress in the battery cell stack 110, reducing the damage of expansion stress to the battery cell 110, helping to improve the service life of the battery cell 110, and the safety of the battery pack.

[0058] Meanwhile, the battery pack in this embodiment eliminates the process of assembling cells into multiple battery modules, which not only reduces the number of battery pack components and material costs, simplifies the assembly process, and improves assembly efficiency, but also helps to increase the energy density of the battery pack.

[0059] like Figure 2 In some embodiments, the skateboard assembly 4000 further includes a guide rail 4200 located below the support member 4100 and extending in a second direction; the support member 4100 and the guide rail 4200 are slidably engaged.

[0060] For example, the radial cross-sectional shape of the guide rail 4200 can be circular, elliptical, or polygonal (e.g., rectangular or triangular).

[0061] For example, the maximum dimension of the guide rail 4200 along the first direction is smaller than the maximum dimension of the support member 4100 along the first direction.

[0062] The support member 4100 can slide along the guide rail 4200. On the one hand, the guide rail 4200 can limit the sliding trajectory of the support member 4100, which helps to keep the cells 110 in the cell stack 100 in a stacked state. On the other hand, since the contact area between the guide rail 4200 and the support member 4100 can be designed to be small, it helps to reduce the frictional resistance experienced by the support member 4100 when it moves.

[0063] Figure 3 This shows a partial front-view sectional view of the battery pack. Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle.

[0064] like Figure 3 and Figure 4 In some embodiments, the bottom of the support member 4100 is provided with a guide groove 4121, which penetrates the side wall of the support member 4100 along the second direction; along the height direction of the slide plate assembly 4000 (e.g. Figure 3 (in the Z direction), the guide rail 4200 is partially set in the guide groove 4121.

[0065] For example, the cross-sectional shape of the guide groove 4121 is adapted to the cross-sectional shape of the guide rail 4200.

[0066] For example, the dimension of the guide groove 4121 along the first direction is adapted to the dimension of the guide rail 4200 along the first direction.

[0067] A guide groove 4121 is provided at the bottom of the support member 4100. The upper part of the guide rail 4200 is disposed in the guide groove 4121, and the lower part is exposed for contact with the lower housing 2100. The groove wall of the guide groove 4121, which is arranged opposite to the guide rail 4200 along the first direction, can cooperate with the guide rail 4200 to further limit the support member 4100 and prevent the support member 4100 from deviating along the first direction during the sliding process along the second direction.

[0068] Meanwhile, since the upper part of the guide rail 4200 is located inside the support member 4100 through the guide groove 4121, the overall height of the skateboard assembly 4000 can be reduced, which in turn helps to reduce the overall height of the battery pack and increase the energy density of the battery pack.

[0069] like Figure 2 and Figure 4 In some embodiments, the guide groove 4121 is a dovetail groove, and the cross-sectional shape of the guide rail 4200 is adapted to the guide groove 4121.

[0070] When the guide groove 4121 is a dovetail groove and the guide rail 4200 is a dovetail-shaped guide rail, after the guide rail 4200 is set in the guide groove 4121, the guide rail 4200 and the support member 4100 can not only achieve mutual restraint along the first direction, but also achieve restraint along the height direction of the slide assembly 4000. That is, the guide rail 4200 will not directly detach from the guide groove 4121 along the height direction of the slide assembly 4000. This helps to improve the connection reliability between the support member 4100 and the guide rail 4200. Even if the battery pack encounters vibration or impact during placement or use, it can be ensured that the support member 410 will not detach from the guide rail 4200. This can ensure that the battery cells 110 in the battery cell stack 100 remain in a stacked state, making it easy to directly install the battery cell module 1000 into the housing 2000.

[0071] Figure 5 A partial exploded view of the skateboard assembly 4000 from a first-view perspective is shown.

[0072] like Figure 5 In some embodiments, the skateboard assembly 4000 further includes rollers 4300 disposed between the support member 4100 and the guide rail 4200.

[0073] For example, roller 4300 may include tapered rollers, cylindrical rollers, spherical rollers, helical rollers, or needle rollers, etc.

[0074] The roller 4300 can further reduce the friction between the support 4100 and the guide rail 4200. When the battery cell 110 supported by the support 4100 is subjected to expansion stress, the support 4100 can respond more sensitively to the expansion stress and move, further reducing the amount of relative displacement between the battery cell 110 and the support 4100, thereby more effectively protecting the battery cell 110.

[0075] like Figure 4 In some embodiments, the bottom of the support member 4100 is provided with a guide groove 4121; the top of the guide rail 4200 is provided with a receiving groove 4210, which extends along the second direction; the roller 4300 is installed in the receiving groove 4210 and abuts against the bottom of the receiving groove 4210 and the bottom of the guide groove 4121, respectively.

[0076] For example, the receiving groove 4210 may extend through both ends of the guide rail 4200.

[0077] For example, the receiving groove 4210 may be arranged continuously or discontinuously along the second direction.

[0078] For example, the cross-sectional shape of the receiving groove 4210 is adapted to the cross-sectional shape of the roller 4300 so that the roller 4300 can roll smoothly in the second direction within the receiving groove 4210.

[0079] The roller 4300 is installed in the receiving groove 4210 at the top of the guide rail 4200. The receiving groove 4210 can limit the roller 4300 along the first direction and prevent the roller 4300 from coming out between the support member 4100 and the guide rail 4200.

[0080] Meanwhile, the lower part of the roller 4300 is located within the receiving groove 4210 and abuts against the bottom of the groove 4210, while the upper part protrudes from the opening of the receiving groove 4210 and abuts against the bottom of the guide groove 4121. This not only reduces the frictional resistance between the support member 4100 and the guide rail 4200 through the roller 4300, but also reduces the overall height of the slide plate assembly 4000 because a portion of the roller 4300 is located inside the guide rail 4200 through the receiving groove 4210.

[0081] Figure 6 A partial bottom-view diagram of the battery pack is shown.

[0082] like Figure 5 and Figure 6 In some embodiments, each skateboard assembly 4000 includes a plurality of guide rails 4200, which are evenly spaced along a first direction.

[0083] For example, each skateboard assembly 4000 may be provided with three guide rails 4200 along a first direction, one guide rail 4200 corresponding to the middle of the support member 4100, and the other two symmetrically arranged and close to the ends of the support member 4100. Providing three guide rails 4200 can prevent the middle of the support member 4100 from collapsing and can also avoid increased costs due to an excessive number of guide rails 4200.

[0084] To enable the support member 4100 to slide more smoothly along the guide rail 4200, in this embodiment, multiple guide rails 4200 evenly spaced along the first direction are provided below the support member 4100. The multiple guide rails 4200 can jointly support and limit the support member 4100, thereby reducing the offset of the support member 4100 along the first direction when it moves. Even if the individual cells 110 of the cell stack 100 move away from each other and move closer to each other during the charge and discharge cycle, they can still maintain alignment along the second direction and maintain the stacked state.

[0085] Meanwhile, multiple guide rails 4200 can also prevent the support member 4100 from tilting or partially collapsing under the gravity of the battery cell 110, thereby preventing the support member 4100 from getting stuck with the guide rail 4200.

[0086] Figure 7 This diagram shows a partial side view cross-section of the battery pack. Figure 8 for Figure 7 Enlarged schematic diagram of part B.

[0087] like Figure 6 , Figure 7 and Figure 8 The two ends of the guide rail 4200 are respectively connected to the two side plate assemblies 300.

[0088] For example, the guide rail 4200 can be connected to the side plate assembly 300 by means of plug-in, snap-fit, adhesive connection, bolt connection or welding.

[0089] The guide rail 4200 located between the two side plate assemblies 300 is connected to the side plate assembly 300 through its end, which can make the side plate assembly 300, the connecting beam 400, the guide rail 4200, the support member 4100 and the cell stack 100 into a whole, which facilitates battery pack assembly.

[0090] like Figure 2 In some embodiments, an elastic component 200 is connected to the side of the side plate assembly 300 near the cell stack 100. The elastic component 200 is capable of extending and retracting in a second direction and abutting against the end surface of the cell stack 100.

[0091] For example, the end surface of the cell stack 100 can be the side surface of the cell 110 with a larger surface area; or it can be the surface of the structural layer covering the surface of the cell 110; or it can be the surface of the structural member that abuts against the surface of the cell 110.

[0092] For example, the top height of the support member 4100 is lower than that of the elastic component 200 to ensure that the elastic component 200 can abut against the end surface of the cell stack 100, rather than against the support member 4100.

[0093] For example, the elastic component 200 may include a plate-like structure, one side of which abuts against the end surface of the cell stack 100, and the other side facing the side plate assembly 300, with a spring connecting the plate-like structure and the side plate assembly 300.

[0094] The connecting beam 400 can provide tension to the two side plate assemblies 300, so that each side plate assembly 300 can maintain a preset distance from the end surface of its corresponding cell stack 100. Therefore, the side plate assembly 300 can support the elastic component 200 along the second direction, so that the elastic component 200 can remain in contact with the end surface of the cell stack 100, thereby clamping and fixing the cell stack 100 with the two side plate assemblies 300. Whether the battery pack is stationary or being transported, it can ensure that the multiple cells 110 in the cell stack 100 can maintain their stacked state.

[0095] When the battery cell 110 in the battery cell stack 100 expands, the elastic component 200 can contract and deform due to its own characteristics to absorb the expansion stress generated by the battery cell stack 100. At the same time, since the distance between the side plate assembly 300 and the end surface of the battery cell stack 100 does not change, the elastic component 200 can still compress the end surface of the battery cell stack 100 under the support of the side plate assembly 300.

[0096] like Figure 7 and Figure 8 In some embodiments, the top of the support member 4100 is provided with a support surface 4130, which includes a flat first region 4131 and an upwardly inclined second region 4132; the second region 4132 is connected to the opposite sides of the first region 4131 along a second direction.

[0097] For example, the angle between the surface of the second region 4132 and the surface of the first region 4131 is an obtuse angle.

[0098] The two second regions 4132 form an upwardly tilted area at the edge of the first region 4131. The two second regions 4132 can play a certain role in constricting and limiting the battery cell 110 placed on the first region 4131, so as to better ensure that the support member 4100 can move together with the battery cell 110 it supports, and prevent the battery cell 110 from falling off the support surface 4130.

[0099] Figure 9 A partial exploded view of the second perspective of the skateboard assembly 4000 is shown.

[0100] like Figure 8 and Figure 9 In some embodiments, the support member 4100 includes a support plate 4110 and a guide block 4120 connected to the bottom of the support plate 4110; the support plate 4110 has a plate-like structure and the top surface of the support plate 4110 is constructed as a support surface 4130.

[0101] For example, the guide block 4120 can be connected to the pallet 4110 by means of welding, bonding, snap-fitting, bolting or integral molding.

[0102] The support plate 4110, with a supporting surface 4130, is used to support the battery cell 110. Therefore, the top surface of the support plate 4110 needs to have a large surface area so that at least one battery cell 110 can be placed on the same support plate 4110. While ensuring the strength of the support plate 4110 meets the process requirements, the thickness of the support plate 4110 can be reduced to decrease its weight and material cost. Therefore, in this embodiment, the support plate 4110 is designed as a plate structure.

[0103] like Figure 8 and Figure 9 In some embodiments, the guide block 4120 is provided with a guide groove 4121 for cooperating with the guide rail 4200, and the guide groove 4121 extends along the height direction of the slide assembly 4000 to the bottom of the tray 4110.

[0104] For example, guide block 4120 can be a hollow profile.

[0105] The guide block 4120 mates with the guide rail 4200. To ensure reliable positioning of the guide block 4120 through the guide groove 4121 and guide rail 4200, the groove wall of the guide groove 4121 needs a certain height so that the overlapping area between the groove wall and the guide rail 4200 meets process requirements. In other words, to ensure that the depth of the guide groove 4121 is sufficient to position the guide rail 4200, the thickness of the guide block 4120 is required. Therefore, in this embodiment, the guide block 4120 is designed as a block structure with a certain thickness.

[0106] Meanwhile, the guide groove 4121 is designed to penetrate through the guide block 4120 and extend to the bottom of the tray 4110. On the one hand, this helps to increase the height of the guide groove 4121 to improve the reliability of the limit. On the other hand, it also allows a larger portion of the guide rail 4200 along the height direction of the slide assembly 4000 to be set inside the guide block 4120, which helps to further reduce the overall height of the slide assembly 4000.

[0107] like Figure 2 and Figure 3 In some embodiments, the slide plate assembly 4000 corresponds one-to-one with the battery cell stack 100.

[0108] At the same time, the expansion amounts of different cells 110 are different, and correspondingly, the displacement amounts of cells 110 in different cell stacks 100 are also different. If the cells 110 of different cell stacks 100 are placed on the same support member 4100, the support member 4100 can only move with the cell 110 of one cell stack 100, while the cells 110 of other cell stacks 100 are likely to move relative to the support member 4100, which is not conducive to the protection of the cells 110.

[0109] Therefore, in this embodiment, one slide assembly 4000 corresponds to only one battery cell stack 100, in order to further reduce the amount of displacement between the battery cell 110 and the support member 4100, which helps to improve the protection effect of the battery cell 110.

[0110] like Figure 5 and Figure 7In some embodiments, each slide assembly 4000 includes a plurality of support members 4100 arranged along a second direction, and each cell 110 in the cell stack 100 is supported by a corresponding support member 4100.

[0111] If too many cells 110 are mounted on the same support member 4100, a relatively large displacement may still occur between a certain cell 110 and the support member 4100. Therefore, in this embodiment, multiple support members 4100 are provided. On the one hand, this ensures that each cell 110 in the cell stack 100 is supported by the support member 4100, so that each cell 110 will not contact the lower housing 2100, which helps to provide comprehensive protection for all cells 110 in the cell group module 1000. On the other hand, it reduces the number of cells 110 corresponding to each support member 4100, thereby reducing the amount of displacement between the cell 110 and the support member 4100.

[0112] like Figure 6 In some embodiments, each side plate group 300 includes a plurality of side plate segments 310 distributed along a first direction and detachably connected. The side plate segments 310 located on both sides of the same cell stack 100 are detachably connected to the connecting beams 400 located at both ends of the corresponding cell stack 100 and clamp and fix the cell stack 100 when connected.

[0113] For example, two adjacent side plate segments 310 can be detachably connected end to end by means of bolts or snap-fit. The side plate segment 310 and the connecting beam 400 can also be detachably connected end to end by means of bolts or snap-fit.

[0114] For example, in two adjacent side plate segments 310, the beginning end of one is stacked with the end end of the other, and the connecting beam 400 corresponds to the stacked portion of the side plate segment 310. Bolts pass through the stacked portion of the side plate segment 310 and connect to the corresponding connecting beam 400. By using the same bolt, the two adjacent side plate segments 310 and the connecting beam 400 can be mutually fixed, reducing the number of bolts in the battery pack. This not only helps reduce the material cost of the battery pack but also simplifies the assembly process and improves assembly efficiency.

[0115] Each cell stack 100 is provided with a pair of side plate segments 310. Under the action of the connecting beam 400 connected to them, the pair of side plate segments 310 can reliably clamp and fix the cell stack 100.

[0116] The side plate assembly 300 in this embodiment adopts a modular design. The length of the side plate assembly 300 can be adjusted by increasing or decreasing the number of side plate segments 310, so that the side plate assembly 300 can provide a stable clamping force for different numbers of battery cell stacks 100. At the same time, the modular design can also effectively reduce the number of specifications of the side plate assembly 300 and reduce material management costs.

[0117] Meanwhile, the adjacent side plate sections 310 and the side plate section 310 and the connecting beam 400 are detachable connections, which makes the battery cell module 1000 have good maintainability.

[0118] like Figure 2 and Figure 6 In some embodiments, the cell pack module 1000 further includes a battery management system, which includes multiple slave control boards. Each side panel segment 310 is equipped with a slave control board, and the slave control board is electrically connected to the cell stack 100 corresponding to the side panel segment 310.

[0119] For example, the control panel and side panel segment 310 can be connected by adhesive, snap-fit ​​or by fasteners (e.g., screws).

[0120] It should be noted that for the same side panel group 300, the side panel segments 310 included therein correspond one-to-one with the cell stack 100, and the slave control board connected to the side panel segment 310 can also correspond one-to-one with the cell stack 100.

[0121] The slave control board is electrically connected to multiple cells 110 in the corresponding cell stack 100, enabling it to collect voltage and temperature data of each connected cell 110 and perform real-time monitoring. The slave control board can also communicate with the main control board in the battery management system, allowing it to send data to or receive control commands from the main control board.

[0122] The slave control board is connected to the side plate segment 310, which can fix the slave control board in a preset position and form a reliable connection with the battery cell 110 and / or other devices. In this embodiment, it eliminates the need for a separate fixing bracket for the slave control board in the battery pack, which helps improve the internal space utilization of the battery cell module 1000 and increases the energy density of the battery cell module 1000.

[0123] In some embodiments, cell 110 includes pouch cell.

[0124] The two side plate assemblies 300 can clamp and fix the multiple cells 110 stacked in the cell stack 100. Even if the cell 110 is a soft-pack cell, the multiple soft-pack cells in the cell stack 100 can be kept in a stacked state, which is convenient for assembly and transportation.

[0125] like Figure 2 In some embodiments, the housing 2000 includes a plate-shaped lower housing 2100, and the side panel assembly 300 is connected to the lower housing 2100 by fasteners 3000.

[0126] For example, the enclosure 2000 may also include a flange connected to the lower enclosure 2100, and the enclosure 2000 may be connected to the enclosure cover via the flange.

[0127] For example, fastener 3000 can be a bolt, screw, or threaded post.

[0128] For example, guide rail 4200 can be bonded to lower housing 2100.

[0129] Taking the connection of the side panel assembly 300 and the lower housing 2100 via fastener 3000 as an example, after the fastener 3000 passes through the side panel assembly 300, one end of the fastener 3000 extending out of the side panel assembly 300 can be connected to the lower housing 2100 (for example, when the fastener 3000 is a bolt, and the lower end extends out of the side panel assembly 300, it can be threadedly connected to the lower housing 2100), and the other end (for example, the nut of the bolt) can abut against the side panel assembly 300, so that the side panel assembly 300 and the lower housing 2100 are fitted and fixed, thereby realizing the connection between the battery cell module 1000 and the housing 2000.

[0130] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0131] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0132] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0133] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0134] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0135] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: A battery cell assembly module includes multiple battery cell stacks, multiple connecting beams, and two side plate assemblies. The multiple battery cell stacks are arranged along a first direction, and each battery cell stack includes multiple battery cells stacked along a second direction. The connecting beams are arranged at both ends of each battery cell stack along the first direction. The two side plate assemblies are located on both sides of the battery cell stack along the second direction, and the two side plate assemblies are connected and clamped to fix the battery cell stack by the connecting beams. The housing, wherein the battery cell module is connected to the housing; A sliding plate assembly is disposed between the battery cell stack and the housing. The sliding plate assembly includes a plurality of support members, each of which supports a portion of the battery cells in the battery cell stack, and the support member is movable relative to the housing along the second direction as the battery cells expand or contract.

2. The battery pack according to claim 1, characterized in that, The skateboard assembly also includes a guide rail located below the support member and extending along the second direction; the support member slides in conjunction with the guide rail.

3. The battery pack according to claim 2, characterized in that, The bottom of the support member is provided with a guide groove, which extends through the side wall of the support member along the second direction; along the height direction of the slide plate assembly, the guide rail portion is disposed within the guide groove.

4. The battery pack according to claim 3, characterized in that, The guide groove is a dovetail groove, and the cross-sectional shape of the guide rail is adapted to the guide groove.

5. The battery pack according to claim 2, characterized in that, The skateboard assembly also includes rollers disposed between the support member and the guide rail.

6. The battery pack according to claim 5, characterized in that, The bottom of the support member is provided with a guide groove; the top of the guide rail is provided with a receiving groove, which extends along the second direction; the roller is installed in the receiving groove and abuts against the bottom of the receiving groove and the bottom of the guide groove, respectively.

7. The battery pack according to claim 2, characterized in that, Each of the said skateboard assemblies includes a plurality of said guide rails, the plurality of guide rails being evenly spaced along the first direction; and / or The two ends of the guide rail are respectively connected to the two side plate assemblies one by one.

8. The battery pack according to claim 1, characterized in that, The side plate assembly is connected to an elastic component on the side closest to the cell stack; the elastic component is capable of extending and retracting along the second direction and abuts against the end surface of the cell stack; and / or, The sliding plate assembly corresponds one-to-one with the battery cell stack; and / or, Each of the skateboard assemblies includes a plurality of support members arranged along the second direction, and each of the battery cells in the battery cell stack is supported by a corresponding support member.

9. The battery pack according to claim 1, characterized in that, The top of the support member is provided with a support surface, which includes a flat first region and an upwardly inclined second region; the second region is located on opposite sides of the first region along the second direction.

10. The battery pack according to claim 9, characterized in that, The support includes a support plate and a guide block connected to the bottom of the support plate; The tray has a plate-like structure, and the top surface of the tray is constructed as the support surface; And / or, The guide block is provided with a guide groove for cooperating with the guide rail, and the guide groove extends along the height direction of the slide assembly to the bottom of the tray.

11. The battery pack according to claim 1, characterized in that, Each of the side plate groups includes a plurality of side plate segments distributed along the first direction and detachably connected. The side plate segments located on both sides of the same cell stack are detachably connected to the connecting beams located at both ends of the corresponding cell stack and clamp and fix the cell stack when connected.

12. The battery pack according to claim 11, characterized in that, The cell assembly module also includes a battery management system, which includes multiple slave control boards. Each side panel segment is equipped with a slave control board, and the slave control board is electrically connected to the cell stack corresponding to the side panel segment.

13. The battery pack according to claim 1, characterized in that, The battery cells include pouch cells.

14. The battery pack according to claim 1, characterized in that, The enclosure includes a plate-shaped lower enclosure, and the side panel assembly is connected to the lower enclosure by fasteners.

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