Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body; the battery cell group module 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; a connecting beam is arranged between every two adjacent battery cell stacking bodies; the two side plate groups are located on the two sides, distributed in the second direction, of the battery cell stacking body, and the two side plate groups are connected through the connecting beam and clamp and fix the battery cell stacking body; wherein the side plate group is provided with a connecting structure, and the connecting structure is fixedly connected with the box body through a first fastener. According to the battery pack provided by the invention, the battery cell stack is clamped by the two side plate groups, so that the battery cell group modules can form a whole with a stable structure. The connecting structure on the side plate group is connected with the box body through the first fastener, so that the battery cell group module is directly fixed on the box body, the procedure of forming the battery cell into the battery module is omitted, and the energy density of the battery pack and the internal space utilization rate are favorably improved.

Description

Technical Field

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

[0002] The battery system of a new energy vehicle includes a battery pack, which consists of a housing and multiple battery cells installed inside the housing. In order for the multiple battery cells to be stably and reliably connected to the housing, the multiple battery cells need to be stacked to form a battery cell stack, then at least one battery cell stack is installed into the housing to form a battery module, and finally the multiple battery modules are fixed to the housing.

[0003] Inside the battery pack, the battery module casing occupies a certain amount of space, resulting in lower energy density and lower internal space utilization. Furthermore, when a large number of cells need to be installed in the battery pack, the need for numerous casings also leads to higher material costs and more inconvenient assembly. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a battery pack that at least partially solves the problems of low energy density and low internal space utilization of battery packs.

[0005] Based on the above objectives, a first aspect of this application provides a battery pack, comprising: a housing; a cell assembly module, including multiple cell stacks, multiple connecting beams, and two side plate assemblies; the multiple cell stacks are arranged along a first direction, each cell stack including multiple cells stacked along a second direction; the connecting beams are arranged between two adjacent cell stacks; the two side plate assemblies are located on both sides of the cell stacks distributed along the second direction, and the two side plate assemblies are connected and clamped to the cell stacks by the connecting beams; wherein, the side plate assemblies have a connecting structure, and the connecting structure is connected and fixed to the housing by a first fastener.

[0006] Optionally, the housing includes a plate-shaped lower housing, and the connecting structure includes a mounting through hole that extends through the side plate assembly along the height direction of the battery cell. The first fastener passes through the mounting through hole through the side plate assembly and is connected to the lower housing. The top of the first fastener presses the side plate assembly in the direction toward the lower housing.

[0007] Optionally, the top of the side plate assembly is formed with a receiving groove for receiving the top of the first fastener.

[0008] Optionally, the housing includes a plate-shaped lower housing; the connecting structure includes a mounting flange protruding from the side plate assembly along the second direction, the first fastener passing through the mounting flange and connected to the lower housing, and the top of the first fastener pressing the mounting flange in the direction toward the lower housing.

[0009] Optionally, the side plate assembly extends along the first direction, and the mounting flange extends from one end of the side plate assembly to the other end along the first direction; a plurality of the first fasteners are provided along the first direction.

[0010] Optionally, the mounting flange may be continuously or intermittently arranged along the first direction.

[0011] Optionally, the lower housing has a connecting seat protruding from the plate surface, and the first fastener passing through the mounting flange is connected to the top of the connecting seat.

[0012] Optionally, multiple connecting seats are provided at intervals along the first direction.

[0013] 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 beam located at at least one end of the corresponding cell stack and clamp and fix the cell stack when connected.

[0014] Optionally, in the same side plate assembly, the head of one of two adjacent side plate segments is stacked with the tail of the other to form a stacked structure; the connecting beam corresponds to the stacked structure; the cell assembly module includes a second fastener, which penetrates the stacked structure along the second direction and is connected to the corresponding connecting beam.

[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 battery cell module further includes straps, through which the two side plate assemblies are bound and fastened.

[0018] As can be seen from the above, the battery pack provided in this application uses two side plate assemblies to clamp and fix the stacked cells, thus enabling multiple cells, side plate assemblies, and connecting beams in the cell assembly module to form a structurally stable whole. The side plate assemblies have a connecting structure, which is connected to the housing through a first fastener, thereby directly fixing the cell assembly module to the housing, eliminating the need for assembling the cells into multiple battery modules. Since the battery pack no longer needs to have a battery module housing, it not only reduces the number of battery pack components and material costs, simplifies the assembly process, and improves assembly efficiency, but also helps to improve the energy density of the battery pack and its internal space utilization.

[0019] Meanwhile, the battery cell may expand during charge-discharge cycles, potentially compressing the side plate assembly. In this application, the first fastener can also limit the side plate assembly along the second direction, resisting the expansion force of the battery cell and helping to improve the structural strength of the battery cell assembly module. 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 with a first structure according to an embodiment of this application;

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

[0023] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0024] Figure 4 This is a partial schematic diagram of a battery pack with a second structure according to an embodiment of this application;

[0025] Figure 5 for Figure 4 Enlarged schematic diagram of part B in the middle;

[0026] Figure 6 This is a partial exploded view of a battery pack with a second structure according to an embodiment of this application;

[0027] Figure 7 This is a partially exploded view of the cell assembly module of a battery pack with a first structure according to an embodiment of this application.

[0028] Figure 8 for Figure 7An enlarged schematic diagram of section C.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1000, Housing; 1100, Lower Housing; 1110, Connecting Base;

[0031] 2000, Cell assembly module; 2100, Cell stack; 2110, Cell; 2200, Connecting beam; 2300, Side plate assembly; 2310, Side plate segment; 2320, Connecting structure; 2321, Mounting through hole; 2322, Mounting flange; 2330, Receiving groove; 2340, Stacked structure; 2400, Second fastener; 2500, Binding strap;

[0032] 3000, First fastener. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Figure 1 This shows a partial schematic diagram of the battery pack with the first structure. Figure 2A partial exploded view of the battery pack with the first structure is shown; Figure 3 Showing Figure 2 An enlarged schematic diagram of part A in the middle.

[0039] like Figure 1 , Figure 2 and Figure 3 This application provides a battery pack, including: a housing 1000; a cell assembly module 2000, including multiple cell stacks 2100, multiple connecting beams 2200, and two side plate assemblies 2300; the multiple cell stacks 2100 are arranged along a first direction (e.g., ...). Figure 1 The cells are arranged in the X direction, and each cell stack 2100 includes multiple cells arranged along the second direction (e.g., the X direction). Figure 1 The battery cells 2110 are stacked in the Y direction; a connecting beam 2200 is arranged between two adjacent battery cell stacks 2100; two side plate groups 2300 are located on both sides of the battery cell stacks 2100 distributed along the second direction, and the two side plate groups 2300 are connected and clamped to fix the battery cell stacks 2100 by the connecting beam 2200; wherein, the side plate group 2300 has a connecting structure 2320, and the connecting structure 2320 is connected and fixed to the housing 1000 by a first fastener 3000.

[0040] For example, the housing 1000 may include a plate-shaped lower housing 1100, which may have a flange and can be connected to the housing cover via the flange. The battery cell module 2000 can be connected to the lower housing 1100 via a first fastener 3000.

[0041] For example, the battery cell module 2000 can be detachably connected to the housing 1000 via the first fastener 3000 to improve the maintainability of the battery cell module 2000 and facilitate the removal of the battery cell module 2000 from the housing 1000 for maintenance or replacement.

[0042] For example, the first fastener 3000 can be threaded or snapped into the housing 1000.

[0043] For example, the first fastener 3000 may include a bolt, screw, threaded post, or rod structure with a snap-fit ​​connector.

[0044] For example, the connection structure 2320 may include a through hole formed in the side plate assembly 2300, or a protruding structure with a through hole formed in the side plate assembly 2300, or a snap-fit ​​groove formed in the side plate assembly 2300.

[0045] For example, the connecting beam 2200 can be connected to the side plate assembly 2300 by means of plug-in, snap-fit, or bolt connection.

[0046] The two side plate assemblies 2300 and the connecting beam 2200 can be constructed into a frame structure. The connecting beam 2200 can provide tension to the two side plate assemblies 2300, so that both side plate assemblies 2300 can clamp the cell stack 2100. All the cells 2110 in the cell stack 2100 can remain stacked under the action of this compressive force. Multiple cell stacks 2100, multiple connecting beams 2200 and two side plate assemblies 2300 can also form a relatively stable whole structure.

[0047] The side plate assembly 2300 can be connected to the housing 1000 by the first fastener 3000 and the connecting structure 2320. Correspondingly, the cell stack 2100 clamped by the two side plate assemblies 2300 can be fixed to the housing 1000.

[0048] The battery pack provided in this embodiment uses two side plate assemblies 2300 to clamp and fix the cell stack 2100, thus forming a structurally stable whole with multiple cells 2110 in the cell assembly module 2000, the side plate assemblies 2300, and the connecting beam 2200. The side plate assembly 2300 has a connecting structure 2320, which is connected to the housing 1000 via a first fastener 3000, thereby directly fixing the cell assembly module 2000 to the housing 1000, eliminating the need to assemble the cells 2110 into multiple battery modules. Since the battery pack in this embodiment does not require a battery module housing, it not only reduces the number of components and material costs, simplifies the assembly process, and improves assembly efficiency, but also helps to increase the energy density and internal space utilization of the battery pack.

[0049] Meanwhile, the battery cell 2110 may expand during charge-discharge cycles, compressing the side plate assembly 2300. In this embodiment, the first fastener 3000 can also limit the side plate assembly 2300 along the second direction, resisting the expansion force of the battery cell 2110 and helping to improve the structural strength of the battery cell assembly module 2000.

[0050] In some embodiments, a buffer layer and / or a heat insulation layer may be provided between two adjacent cells 2110 in the same cell stack 2100. The buffer layer can absorb the expansion stress generated by the cell 2110, thereby reducing the impact of the expansion stress on the side plate assembly 2300. The buffer layer can be a foam layer or a structural layer formed of other elastic materials. The heat insulation layer can reduce heat transfer between adjacent cells 2110, which helps to improve the heat exchange efficiency and safety of the battery pack.

[0051] like Figure 3 In some embodiments, the housing 1000 includes a plate-shaped lower housing 1100, and the connecting structure 2320 includes a section along the height direction of the battery cell 2110 (e.g., ...). Figure 3The mounting through hole 2321 of the side panel assembly 2300 (in the Z direction) is through the mounting through hole 2321. The first fastener 3000 passes through the side panel assembly 2300 through the mounting through hole 2321 and is connected to the lower housing 1100. The top of the first fastener 3000 presses the side panel assembly 2300 in the direction toward the lower housing 1100.

[0052] For example, the lower housing 1100 may have a thermally conductive adhesive layer. After the cell assembly module 2000 is connected to the lower housing 1100, the cell 2110 can be bonded and fixed to the lower housing 1100 through the thermally conductive adhesive layer. The heat of the cell 2110 can be efficiently transferred to the lower housing 1100 through the thermally conductive adhesive layer, which helps to improve the heat exchange effect of the battery pack.

[0053] Taking the first fastener 3000 as a bolt as an example, the top of the first fastener 3000 is the bolt nut. The threaded shank of the bolt can pass through the mounting through hole 2321 from top to bottom through the side plate assembly 2300. The end of the threaded shank away from the nut extends out of the side plate assembly 2300 and is threadedly connected to the lower housing 1100. The nut is located above the side plate assembly 2300 and presses the side plate assembly 2300 in the direction towards the lower housing 1100 so that the side plate assembly 2300 can fit and be fixed to the lower housing 1100, thereby realizing a reliable connection between the battery cell module 2000 and the housing 1000.

[0054] like Figure 3 In some embodiments, the top of the side plate assembly 2300 is formed with a receiving groove 2330 for receiving the top of the first fastener 3000.

[0055] Taking the first fastener 3000 as a bolt as an example, if the nut is exposed, it is easily subjected to external force when assembling or using the battery pack, which may cause the bolt to loosen, and will have an adverse effect on the connection reliability between the cell module 2000 and the housing 1000.

[0056] In this embodiment, a receiving groove 2330 is provided on the side plate assembly 2300. Under normal circumstances, it is difficult for external forces to act on the nut located in the receiving groove 2330, so the bolt can be kept in a locked state, which helps to improve the connection reliability between the battery cell assembly module 2000 and the housing 1000.

[0057] Figure 4 A partial schematic diagram of the second type of battery pack is shown. Figure 5 Showing Figure 4 Enlarged schematic diagram of part B.

[0058] like Figure 4 and Figure 5In some embodiments, the connection structure 2320 includes a mounting flange 2322 that protrudes from the side plate assembly 2300 in a second direction, a first fastener 3000 passing through the mounting flange 2322 and connected to the lower housing 1100, and the top of the first fastener 3000 pressing the mounting flange 2322 in a direction toward the lower housing 1100.

[0059] For example, when the mounting flange 2322 is connected to the lower housing 1100 by the first fastener 3000, the bottom of the side plate assembly 2300 and / or the bottom of the connecting beam 2200 can abut against the plate surface of the lower housing 1100.

[0060] For example, the mounting flange 2322 and the side plate assembly 2300 can be welded, snap-fitted, glued, fastened, or integrally molded.

[0061] In this embodiment, the principle by which the first fastener 3000 presses against the mounting flange 2322 to connect the battery cell module 2000 to the lower housing 1100 is similar to the principle by which the first fastener 3000 presses against the side plate assembly 2300 to connect the battery cell module 2000 to the lower housing 1100, and will not be repeated here.

[0062] It should be noted that since the first fastener 3000 only passes through the mounting flange 2322 and does not pass through the side plate assembly 2300, the dimension of the side plate assembly 2300 in the second direction (i.e., the thickness of the side plate assembly 2300) can be designed to be smaller. This not only reduces the material cost of the side plate assembly 2300, but also helps to improve the energy density of the battery pack and the utilization rate of the internal space.

[0063] Figure 6 A partial exploded view of the second type of battery pack is shown.

[0064] like Figure 4 and Figure 6 In some embodiments, the side plate assembly 2300 extends along a first direction, and the mounting flange 2322 extends from one end of the side plate assembly 2300 to the other end along the first direction; a plurality of first fasteners 3000 are provided along the first direction.

[0065] For example, on the same mounting flange 2322, the first fasteners 3000 are evenly spaced from one end of the mounting flange 2322 to the other end along a first direction.

[0066] In this embodiment, extending the mounting flange 2322 as much as possible helps to improve the connection strength between the mounting flange 2322 and the lower housing 1100, further improving the connection reliability between the cell assembly module 2000 and the housing 1000. During battery pack handling or use, this prevents the cell assembly module 2000 from separating from the housing 1000, thereby improving the safety of the battery pack.

[0067] like Figure 4 and Figure 6 In some embodiments, the mounting flange 2322 is provided continuously or intermittently along the first direction.

[0068] When mounting flanges 2322 are continuously installed, the overall structural strength of mounting flanges 2322 is greater, which can further improve the connection strength and reliability between mounting flanges 2322 and housing 1000.

[0069] For the same mounting flange 2322, even if multiple first fasteners 3000 are correspondingly provided, a certain gap needs to be maintained between two adjacent first fasteners 3000 to facilitate the assembly and disassembly of the first fasteners 3000. The mounting flange 2322 between two adjacent first fasteners 3000 has little impact on the connection strength between the cell module 2000 and the housing 1000, so this part of the mounting flange 2322 can be removed; that is, the mounting flange 2322 can also be intermittently installed. This helps to reduce the material cost of forming the mounting flange 2322 while ensuring the connection strength between the cell module 2000 and the housing 1000.

[0070] like Figure 5 and Figure 6 In some embodiments, the lower housing 1100 has a connecting seat 1110 protruding from the plate surface, and a first fastener 3000 passing through the mounting flange 2322 is connected to the top of the connecting seat 1110.

[0071] For example, the lower housing 1100 has a plate surface with a connecting seat 1110, which is the surface of the lower housing 1100 facing the battery pack module 2000.

[0072] For example, the connector 1110 may be a boss structure with a flat top.

[0073] For example, the connector 1110 and the lower housing 1100 can be connected by welding, snap-fitting, adhesive bonding, fastener connection or integral molding.

[0074] For example, the mounting flange 2322 can abut against the top of the connector 1110.

[0075] Since the connector 1110 protrudes from the plate surface of the lower housing 1100, the structure for connecting with the first fastener 3000 (such as a threaded hole or a snap-fit ​​hole) can be provided on the top surface of the connector 1110 instead of the plate surface of the lower housing 1100, which helps to reduce the length of the first fastener 3000 and reduce the assembly difficulty of the cell assembly module 2000 and the housing 1000.

[0076] Compared to the vertical gap between the lower housing 1100 and the mounting flange 2322, the vertical gap between the top of the connecting seat 1110 and the mounting flange 2322 is smaller. Understandably, the smaller the gap, the more reliably the first fastener 3000 can secure the mounting flange 2322. Therefore, the connection between the first fastener 3000 and the top of the connecting seat 1110 helps improve the connection reliability between the battery cell module 2000 and the housing 1000.

[0077] like Figure 6 In some embodiments, multiple connectors 1110 are spaced apart along a first direction.

[0078] The multiple connectors 1110 are spaced apart, which on the one hand allows the connectors 11110 to match the mounting flanges 2322 extending along the first direction, which helps to improve the connection reliability between the battery cell module 2000 and the housing 1000. On the other hand, due to factors such as machining precision, the first fastener 3000 will generate a certain stress when connected to the connector 1110. The multiple connectors 1110 are spaced apart, which makes it easier to release this stress and prevent the housing 1000 or the side plate assembly 2300 from deforming due to stress.

[0079] Figure 7 A partial exploded view of the cell assembly module 2000 of the first type of battery pack is shown. Figure 8 Showing Figure 7 An enlarged schematic diagram of section C.

[0080] like Figure 7 and Figure 8 In some embodiments, each side plate group 2300 includes a plurality of side plate segments 2310 distributed along a first direction and detachably connected. The side plate segments 2310 located on both sides of the same cell stack 2100 are detachably connected to a connecting beam 2200 located at at least one end of the corresponding cell stack 2100, and clamp and fix the cell stack 2100 when connected.

[0081] For example, two adjacent side plate segments 2310 can be detachably connected end to end by means of fasteners or snap-fit. The side plate segments 2310 and the connecting beam 2200 can also be detachably connected end to end by means of fasteners or snap-fit.

[0082] A pair of side plate segments 2310 are provided for the same cell stack 2100. Under the action of the connecting beam 2200 connected to it, the pair of side plate segments 2310 can reliably clamp and fix the cell stack 2100.

[0083] The side plate assembly 2300 in this embodiment adopts a modular design. The length of the side plate assembly 2300 can be adjusted by increasing or decreasing the number of side plate segments 2310, so that the side plate assembly 2300 can provide a stable clamping force for different numbers of battery cell stacks 2100. At the same time, the modular design can also effectively reduce the number of specifications of the side plate assembly 2300 and reduce material management costs.

[0084] In addition, the adjacent side plate sections 2310 and the side plate section 2310 and the connecting beam 2200 are detachable, which makes the battery cell module 2000 have good maintainability.

[0085] like Figure 7 and Figure 8 In some embodiments, in the same side plate assembly 2300, the head of one of two adjacent side plate segments 2310 is stacked with the tail of the other to form a stacked structure 2340; the connecting beam 2200 corresponds to the stacked structure 2340; the battery cell assembly module 2000 includes a second fastener 2400, which penetrates the stacked structure 2340 along a second direction and is connected to the corresponding connecting beam 2200.

[0086] For example, the second fastener 2400 may include a bolt, screw, threaded post, or rod structure with a snap-fit ​​connector. Accordingly, the second fastener 2400 may be threaded or snap-fit ​​connected to the end of the connecting beam 2200.

[0087] For example, in the same side panel group 2300, the surfaces of all side panel segments 2310 that are close to the cell stack 2100 are in the same plane.

[0088] For example, the thickness of the head and / or tail of the side plate segment 2310 can be half the thickness of the middle portion of the side plate segment 2310, so that the total thickness of the laminated structure 2340 can be the same as the thickness of the middle portion of the side plate segment 2310.

[0089] Taking the second fastener 2400 as a bolt as an example, the bolt's threaded shank can penetrate the stacked structure 2340 laterally from the outside to the inside. That is, the same bolt can pass through two adjacent side plate segments 2310 to fix the relative positions of the two adjacent side plate segments 2310 along a direction perpendicular to the second direction. The end of the threaded shank away from the nut extends out of the stacked structure 2340 and can be threadedly connected to the end of the connecting beam 2200. The nut is located on the outside of the stacked structure 2340 to press the side plate assembly 2300 against the end of the connecting beam 2200, thereby reliably connecting the side plate assembly 2300 with the connecting beam 2200 to clamp the cell stack 2100.

[0090] In this embodiment, the two adjacent side plate segments 2310 and the corresponding connecting beam 2200 can be fixed to each other by the same second fastener 2400, which can reduce the number of fasteners in the battery pack. This not only helps to reduce the material cost of the battery pack, but also simplifies the assembly process of the battery pack and improves the assembly efficiency.

[0091] like Figure 1 and Figure 7 In some embodiments, the cell pack module 2000 further includes a battery management system, which includes multiple slave control boards. Each side panel segment 2310 is equipped with a slave control board, and the slave control board is electrically connected to the cell stack 2100 corresponding to the side panel segment 2310.

[0092] For example, the control panel and side panel segment 2310 can be connected by adhesive, snap-fit ​​or by fasteners (e.g., screws).

[0093] It should be noted that for the same side panel group 2300, the side panel segments 2310 included therein correspond one-to-one with the cell stack 2100, so the slave control board connected to the side panel segment 2310 can also correspond one-to-one with the cell stack 2100.

[0094] The slave control board is electrically connected to multiple cells 2110 in the corresponding cell stack 2100, enabling it to collect voltage and temperature data from each connected cell 2110 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.

[0095] The slave control board is connected to the side plate segment 2310, which can fix the slave control board in a preset position and form a reliable connection with the battery cell 2110 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 space utilization inside the battery cell module 2000 and increases the energy density of the battery pack.

[0096] like Figure 1 In some embodiments, cell 2110 includes pouch cell.

[0097] The two side plate assemblies 2300 can clamp the multiple cells 2110 stacked in the cell stack 2100. Even if the cell 2110 is a soft-pack cell, the multiple soft-pack cells in the cell stack 2100 can be kept in a stacked state, which is convenient for assembly and transportation.

[0098] like Figure 1 and Figure 3 In some embodiments, the battery cell module 2000 also includes a strap 2500, which secures the two side plate assemblies 2300 together.

[0099] For example, the strap 2500 may include metal straps and / or plastic straps.

[0100] For example, the strap 2500 can be wrapped around the two side plate groups 2300 and the cell stack 2100 between the two side plate groups 2300 to bind and secure the two side plate groups 2300; or, the two ends of the strap 2500 can be connected to the two side plate groups 2300 one by one (e.g., hook, weld or fastener connection) to bind and connect the two side plate groups 2300.

[0101] The straps 2500 can also provide tension to the two side plate assemblies 2300, so that the two side plate assemblies 2300 can reliably clamp the cell stack 2100. When both the connecting beam 2200 and the straps 2500 are provided in the battery pack, the connecting beam 2200 and the straps 2500 can work together on the two side plate assemblies 2300 to further improve the structural strength and stability of the cell assembly module 2000.

[0102] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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: Box; 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 between two adjacent battery cell stacks; the two side plate assemblies are located on both sides of the battery cell stacks distributed along the second direction, and the two side plate assemblies are connected and clamped to fix the battery cell stacks through the connecting beams; The side panel assembly has a connecting structure, which is connected and fixed to the housing by a first fastener.

2. The battery pack according to claim 1, characterized in that, The housing includes a plate-shaped lower housing, and the connecting structure includes a mounting through hole that extends through the side plate assembly along the height direction of the battery cell. The first fastener passes through the mounting through hole through the side plate assembly and is connected to the lower housing. The top of the first fastener presses the side plate assembly in the direction toward the lower housing.

3. The battery pack according to claim 2, characterized in that, The top of the side plate assembly has a receiving groove for receiving the top of the first fastener.

4. The battery pack according to claim 1, characterized in that, The enclosure includes a plate-shaped lower enclosure; The connection structure includes a mounting flange protruding from the side plate assembly along the second direction, a first fastener passing through the mounting flange and connected to the lower housing, and the top of the first fastener pressing the mounting flange in the direction toward the lower housing.

5. The battery pack according to claim 4, characterized in that, The side plate assembly extends along the first direction, and the mounting flange extends from one end of the side plate assembly to the other end along the first direction; a plurality of the first fasteners are provided along the first direction.

6. The battery pack according to claim 5, characterized in that, The mounting flange is provided continuously or intermittently along the first direction.

7. The battery pack according to claim 4, characterized in that, The lower housing has a connecting seat protruding from the plate surface, and the first fastener passing through the mounting flange is connected to the top of the connecting seat.

8. The battery pack according to claim 7, characterized in that, The connecting seats are arranged at intervals along the first direction.

9. 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 beam located at at least one end of the corresponding cell stack and clamp and fix the cell stack when connected.

10. The battery pack according to claim 9, characterized in that, In the same side plate assembly, the head of one of two adjacent side plate segments is stacked with the tail of the other to form a stacked structure; the connecting beam corresponds to the stacked structure. The cell assembly module includes a second fastener that penetrates the stacked structure along the second direction and is connected to the corresponding connecting beam.

11. The battery pack according to claim 9, 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.

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

13. The battery pack according to claim 1, characterized in that, The battery cell module also includes straps, and the two side plate assemblies are secured together by the straps.

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