Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. The battery module comprises a shell; the battery cell stacking body is arranged in the internal space of the shell, and the battery cell stacking body comprises a plurality of battery cells which are arranged along a first direction; and the buffer assembly is arranged at at least one end of the battery cell stacking body along a second direction, the buffer assembly is connected with the shell, and the second direction intersects with the first direction. According to the battery module and the battery pack provided by the invention, the buffer assembly arranged on at least one side of the battery cell stacking body along the second direction can prevent the battery cell stacking body from moving relative to the shell to a certain extent. After the end part of the battery module falls downwards and the battery cell stacking body is in contact with the buffer assembly, the buffer assembly can provide supporting force for the battery cell stacking body and at least partially counteracts inertia force acting on the battery cell stacking body, so that the aim of buffering is fulfilled. The deformation of the battery cell stack is reduced, the naked battery cell of the battery cell is prevented from penetrating through the aluminum plastic film, and the risk of fire and explosion caused by liquid leakage of the battery cell is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] In the related art, the bottom, top, and side walls of the existing cell stack in a soft-pack battery module can all be bonded to the shell. However, the ends of the existing cell stack are spaced apart from the shell, and the shell does not contain a structure that can support the ends of the cell stack. When the ends of the soft-pack battery module are impacted, the bare cells in the cell stack may become dislocated and break through the aluminum-plastic film that wraps the bare cells, causing the cell stack to leak and fail, posing a risk of fire and explosion.

[0003] Therefore, how to support the battery cell stack in the end direction of the soft-pack battery module has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery module and a battery pack.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a battery module, including: a shell; a cell stack arranged in the internal space of the shell, the cell stack including a plurality of cell stacks arranged along a first direction; and a buffer assembly arranged at at least one end of the cell stack along a second direction, the buffer assembly being connected to the shell, and the second direction intersects with the first direction.

[0006] Optionally, the battery cell includes a battery cell body, and along the second direction, an orthographic projection of the buffer assembly on the battery cell stack overlaps with an end portion of at least one of the battery cell bodies.

[0007] Optionally, the battery cell further includes a tab, which extends from the end of the battery cell body in a direction away from the battery cell body; the buffer assembly includes at least one buffer body, and the buffer body is provided with a tab avoidance space for the tab to pass through.

[0008] Optionally, the buffer body is disposed between adjacent tabs, and along the first direction, the avoidance spaces are located on two opposite sides of the buffer body.

[0009] Optionally, the buffer assembly includes at least two buffer bodies spaced apart and distributed along the first direction, the at least two buffer bodies are fixedly connected, and the tab avoidance space is defined between adjacent buffer bodies.

[0010] Optionally, the middle portions of the mutually adjacent side walls of the adjacent buffer bodies are spaced apart to define through holes between the adjacent buffer bodies, and the through holes are configured as the tab avoidance spaces.

[0011] Optionally, along the third direction, a redundant portion is provided on at least one side of the battery cell body, and the redundant portion is bent along the first direction. A redundant avoidance space is provided at the end of at least one buffer body in the same buffer assembly, and the redundant avoidance space is used to accommodate the redundant portion; the third direction is perpendicular to the first direction and the second direction respectively.

[0012] Optionally, the battery cell stack includes at least one battery cell group, each battery cell group includes an even number of battery cells; in the same battery cell group, the redundant parts of the battery cells are bent toward the outer side walls of the adjacent battery cell group; the buffer assembly corresponds one-to-one to the battery cell groups, and the buffer assembly includes a first buffer body and an even number of second buffer bodies arranged on both sides of the first buffer body along the first direction, and the end of each second buffer body is provided with the redundant avoidance space.

[0013] Optionally, the battery cell group includes four battery cells, and the buffer assembly includes one first buffer body and two second buffer bodies.

[0014] Optionally, the shell includes two cover plates spaced apart along a third direction, and the battery cell stack is arranged between the two cover plates; along the third direction, the end of at least one of the buffer bodies in the buffer assembly is provided with a connecting structure, and the buffer body is fixedly connected to at least one of the cover plates through the connecting structure.

[0015] Optionally, along the third direction, a heat-melting column passing through the adjacent cover plate is provided at the end of the buffer body, and the heat-melting column constitutes the connection structure.

[0016] Based on the same inventive concept, the second aspect of the present application further provides a battery pack, comprising the battery membrane group as described in the first aspect.

[0017] As can be seen from the above, the battery module and battery pack provided by this application, the buffer assembly provided at at least one end of the battery cell stack along the second direction can, to a certain extent, hinder the movement of the battery cell stack relative to the shell. After the end of the battery module falls downward and the battery cell stack contacts the buffer assembly, the buffer assembly can provide support for the battery cell stack, at least partially offsetting the inertial force acting on the battery cell stack, thereby achieving the purpose of buffering. This helps to reduce the deformation of the battery cell stack, prevent the bare battery cell from penetrating the aluminum-plastic film, and reduce the risk of leakage, fire, and explosion of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is an exploded schematic diagram of a battery module according to an embodiment of the present application;

[0020] Figure 2 A schematic top view of a battery module according to an embodiment of the present application;

[0021] Figure 3 A three-dimensional schematic diagram of a cell group and a buffer assembly of a battery module according to an embodiment of the present application;

[0022] Figure 4 A three-dimensional schematic diagram of multiple buffer components of a battery module according to an embodiment of the present application;

[0023] Figure 5 This is an exploded schematic diagram of multiple buffer components and cover plates of a battery module according to an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 10. Housing; 1. Side plate; 2. End plate; 3. Cover plate; 301. Upper cover; 302. Bottom plate; 303. Connecting through hole; 4. Side adhesive layer; 5. Upper adhesive layer; 6. Lower adhesive layer;

[0026] 20. Battery cell stack; 21. Battery cell group; 22. Battery cell; 221. Battery cell body; 222. Tab; 223. Redundant part;

[0027] 30. Buffer assembly; 31. Buffer body; 31a. First buffer body; 31b. Second buffer body; 32. Tab avoidance space; 33. Redundant avoidance space; 34. Connection structure. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that the relative arrangement of the components, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

[0030] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like 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.

[0033] like Figure 1 As shown, Figure 1 The exploded schematic diagram of the battery module of the embodiment of the present application is shown. The battery module includes a shell 10 and a battery cell stack 20. The battery cell stack 20 is arranged in the internal space of the shell 10. The battery cell stack 20 includes a first direction (such as Figure 1 A plurality of battery cells 22 are arranged in the X direction.

[0034] by Figure 1 Taking the illustrated structure and orientation as an example for further explanation, the housing 10 may include two side panels 1 spaced apart along a first direction, with the battery cell stack 20 positioned between the two side panels 1. Side adhesive layers 4 may be disposed between the battery cell stack 20 and the side panels 1, such that the battery cell stack 20 is bonded and secured to the two side panels 1 via the side adhesive layers 4. For example, the side adhesive layers 4 may be double-sided adhesive foam.

[0035] The housing 10 may further include an upper cover 301 disposed above the cell stack 20, and a bottom plate 302 disposed below the cell stack 20. An upper adhesive layer 5 (e.g., formed by applying glue to the upper surface of the cell stack 20) is disposed on the upper surface of the cell stack 20, such that the cell stack 20 is bonded to the upper cover 301 via the upper adhesive layer 5. Similarly, a lower adhesive layer 6 is disposed on the lower surface of the cell stack 20, such that the cell stack 20 is bonded to the bottom plate 302 via the lower adhesive layer 6.

[0036] The housing 10 may further include two spaced end plates 2 , which are perpendicular to the two side plates 1 . The battery cell stack 20 is disposed between the two end plates 2 , with a space between the battery cell stack 20 and the end plates 2 .

[0037] In conjunction with the background art, since the cell stack 20 is in contact with the two side panels 1, the upper cover 301, and the bottom plate 302, when the battery module is impacted from the side, the two side panels 1 will provide support for the cell stack 20, preventing the cells 22 in the cell stack 20 from moving toward the side panels 1. Similarly, the upper cover 301 and the bottom plate 302 will also support the cell stack 20 when the battery module falls, preventing the cells 22 in the cell stack 20 from moving toward the upper cover 301 or toward the bottom plate 302.

[0038] However, the inventors found that due to the space between the battery cell stack 20 and the end plate 2, when the battery module is impacted at the end, the battery cell stack 20 inside the housing 10 may move in the second direction (such as Figure 1 Since the battery cell stack 20 is bonded and fixed to the side plate 1, the upper cover 301 and the bottom plate 302, the aluminum-plastic film of each battery cell 22 in the battery cell stack 20 is not easy to move further, while the bare battery cell in the aluminum-plastic film will continue to move under the action of inertia force, causing the bare battery cell to break through the aluminum-plastic film and pass out, thereby posing a risk of battery cell 22 leakage, fire and explosion.

[0039] In order to avoid the above problems, the battery module of this embodiment further includes a buffer component 30. The buffer component 30 is arranged along the second direction (eg Figure 1 The buffer assembly 30 is arranged at at least one end of the battery cell stack 20 in the Y direction, which is perpendicular to the X direction, and is connected to the shell 10.

[0040] Illustratively, the buffer assembly 30 may be connected to at least one of the side plate 1 , the upper cover 301 , the bottom plate 302 and the end plate 2 .

[0041] Exemplarily, the buffer assembly 30 may be fixedly connected or slidably connected to the housing 10 .

[0042] For example, the buffer assembly 30 can be connected to the housing 10 by welding, plugging, snapping, hot-melt connection, integral molding connection, or fastener connection.

[0043] In the battery module of this embodiment, the buffer assembly 30, disposed along the second direction at at least one end of the cell stack 20, can, to a certain extent, hinder movement of the cell stack 20 relative to the housing 10. For example, if the end of the battery module falls downward and the cell stack 20 contacts the buffer assembly 30, the buffer assembly 30 can provide support for the cell stack 20, at least partially offsetting the inertial force acting on the cell stack 20, thereby achieving a cushioning effect. This helps to reduce deformation of the cell stack 20, prevent the bare cells of the battery cells 22 from penetrating the aluminum-plastic film, and reduce the risk of leakage, fire, and explosion from the battery cells 22.

[0044] like Figure 2 , Figure 2 The schematic diagram of the top view of the buffer assembly 30 and the battery cell stack 20 is shown. In some embodiments, the battery cell 22 includes a battery cell body 221; Figure 2 In the Y direction), the orthographic projection of the buffer assembly 30 on the battery cell stack 20 overlaps with the end portion of at least one battery cell body 221.

[0045] Illustratively, the battery cell body 221 includes a bare battery cell and an aluminum-plastic film wrapping the bare battery cell.

[0046] Exemplarily, the battery module may include at least two buffer assemblies 30, each buffer assembly 30 corresponding to one battery cell body 221; or, the battery module may include at least two buffer assemblies 30, each buffer assembly 30 corresponding to at least two battery cell bodies 221; or, the battery module may include one buffer assembly 30, and the buffer assembly 30 corresponds to at least two battery cell bodies 221.

[0047] For example, along the second direction, the buffer assembly 30 and the end of the battery cell body 221 may be spaced apart.

[0048] For example, along the second direction, the spacing distance between the buffer assembly 30 and the end surface of the battery cell body 221 (ie, the surface of the aluminum-plastic film at the end of the battery cell body 221 ) may be 2 mm to 4 mm.

[0049] The buffer assembly 30 will only provide support force to the cell stack 20 to achieve the purpose of buffering after it abuts the cell stack 20. It can be understood that this support force needs to act on the position with higher strength in the cell stack 20. For the battery cells 22 in the cell stack 20, the cell body 221 is the part with higher strength in the battery cell 22. In this embodiment, the position of the buffer assembly 30 corresponds to the end of the cell body 221. When the cell stack 20 approaches the buffer assembly 30, the buffer assembly 30 can abut the corresponding end of the cell body 221 to generate support force for the cell stack 20, thereby achieving the purpose of buffering the moving cell stack 20.

[0050] like Figure 3 As shown, Figure 3 A schematic perspective view of a portion of a battery cell 22 and a buffer assembly 30 is shown. In some embodiments, the battery cell 22 further includes a tab 222 extending from an end of the battery cell body 221 away from the battery cell body 221. The buffer assembly 30 includes at least one buffer body 31, which is provided with a tab clearance space 32 for the tab 222 to pass through.

[0051] Exemplarily, the buffer body 31 may be an injection molded part.

[0052] Illustratively, both ends of the battery cell body 221 along its length direction are provided with tabs 222 , and the tabs 222 of adjacent battery cells 22 can be connected by tabs to achieve electrical connection between the adjacent battery cells 22 .

[0053] Exemplarily, the thickness of the buffer body 31 is 4 mm to 12 mm.

[0054] Illustratively, in the thickness direction of the buffer body 31, the tab avoidance space 32 passes through the buffer body 31 to form openings on the surfaces of the buffer body 31 on opposite sides. The tab 222 is inserted into the tab avoidance space 32 through one of the openings, passes through the tab avoidance space 32, and then extends out through the other opening to enable the tab 222 to pass through the buffer body 31.

[0055] As will be appreciated, in order to ensure that the buffer assembly 30 abuts the cell stack 20 at the initial stage of movement, the buffer body 31 can be positioned near the end of the cell 22. This requires the tab 222 at the end of the cell body 221 to pass through the buffer body 31 and connect on the side of the buffer body 31 away from the cell body 221. To ensure that the tab 222 can smoothly pass through the buffer body 31, this embodiment provides a tab avoidance space 32 on the buffer body 31 to ensure that the tab 222 has sufficient room to move, thus preventing the tab 222 from tearing when the buffer assembly 30 abuts the cell stack 20.

[0056] like Figure 3 As shown, in some embodiments, the buffer body 31 is disposed between two adjacent tabs 222, along a first direction (eg Figure 3 The tab avoidance spaces 32 are located on opposite sides of the buffer body 31 .

[0057] For example, the buffer body 31 is along the third direction (eg Figure 3 The strip structure extends in the Z direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0058] In this embodiment, the buffer body 31 is arranged between adjacent tabs 222. The same buffer body 31 can correspond to two adjacent battery cell bodies 221. That is, when the battery cell stack 20 moves, the same buffer body 31 can simultaneously abut against the corresponding two battery cell bodies 221 to provide support. This helps to reduce the number of buffer bodies 31 set in the battery module, reducing the preparation cost and assembly difficulty of the battery module. At the same time, the tab avoidance spaces 32 correspond to the battery cells 22 and are located on opposite sides of the buffer body 31 along the first direction, so that the tabs 222 of each battery cell 22 are aligned with the tab avoidance spaces 32, and the tabs 222 pass through the buffer body 31 through the tab avoidance spaces 32.

[0059] like Figure 4 As shown, Figure 4 The schematic diagram of the buffer assembly 30 is shown. In some embodiments, the buffer assembly 30 includes at least two Figure 4 The buffer bodies 31 are spaced apart and distributed in the X direction in the middle, at least two buffer bodies 31 are fixedly connected, and a tab avoidance space 32 is defined between adjacent buffer bodies 31.

[0060] Exemplarily, the two buffer bodies 31 may be directly connected or indirectly connected via other structural members.

[0061] For example, the two buffer bodies 31 may be fixedly connected by integral molding, welding, bonding, plugging, or fastener connection.

[0062] For example, the side walls of two adjacent buffer bodies 31 that are close to each other can be spaced apart as a whole or partially; the space between the two side walls can be constructed as a tab avoidance space 32 .

[0063] The fixed connection of at least two buffer bodies 31 can improve the overall strength of the buffer assembly 30, allowing the buffer assembly 30 to more reliably support the battery cell stack 20. Furthermore, the fixed connection of at least two buffer bodies 31 can reduce the number of alignments between the buffer bodies 31 and the housing 10 during assembly, thereby reducing the difficulty of battery module assembly and improving assembly efficiency.

[0064] like Figure 4 As shown, in some embodiments, the middle portions of the mutually adjacent side walls of adjacent buffer bodies 31 are spaced apart to define through holes between the adjacent buffer bodies 31 , and the through holes are configured as tab avoidance spaces 32 .

[0065] At least one of the adjacent side walls of the buffer body 31 close to each other is provided with a groove in the middle, and the groove is provided along the thickness direction of the buffer body 31 (for example, Figure 4The groove extends (in the Y direction) to opposite sides of the buffer body 31. The groove and the sidewall of the opposing buffer body 31 define a through hole that serves as a tab clearance space 32. Furthermore, the upper and lower portions of the groove can directly contact the sidewall of the opposing buffer body 31, thereby achieving direct contact and connection between adjacent buffer bodies 31.

[0066] The structure of the tab avoidance space 32 of this embodiment can make the overall structure of the buffer assembly 30 more compact, and provide a structural basis for the direct contact connection between adjacent buffer bodies 31, which is conducive to simplifying the overall structure of the buffer assembly 30.

[0067] It should also be noted that the location where the groove is provided on the buffer body 31 can also be separately constructed as the tab avoidance space 32. Specifically, Figure 4 The groove on the left side wall of the buffer body 31 located on the far left can also be constructed as a tab avoidance space 32, and the tab 222 of the battery cell 22 can pass through the buffer body 31 through the tab avoidance space 32 constructed separately by the groove.

[0068] like Figure 3 As shown, in some embodiments, along the third direction, a redundant portion 223 is provided on at least one side of the battery cell body 221, and the redundant portion 223 is bent along the first direction. A redundant avoidance space 33 is provided at the end of at least one buffer body 31 in the same buffer assembly 30, and the redundant avoidance space 33 is used to accommodate the redundant portion 223.

[0069] Exemplarily, the redundant portion 223 is a portion of the aluminum-plastic film of the battery cell 22 that extends beyond the bare battery cell along the third direction, and is a thin, bendable structure.

[0070] Exemplarily, a groove is provided at the end of the buffer body 31 to reduce the height (dimension along the third direction) of at least part of the buffer body 31 , and the groove at the end of the buffer body 31 is configured as a redundant avoidance space 33 .

[0071] The redundant portion 223 can be located at the top and bottom of the cell body 221. Along the third direction, the orthographic projection of the redundant portion 223 on the buffer body 31 partially overlaps with the end portion of the buffer body 31. To prevent interference between the redundant portion 223 and the buffer body 31, in this embodiment, a redundant avoidance space 33 is provided at the end of the buffer body 31 to accommodate the redundant portion 223.

[0072] like Figure 2 In some embodiments, the cell stack 20 includes at least one cell group 21, each cell group 21 includes an even number of cells 22; in the same cell group 21, the redundant portion 223 of the cell 22 is bent toward the outer side wall of the adjacent cell group 21; the buffer assembly 30 corresponds to the cell group 21 one by one. Figure 3The buffer assembly 30 includes a first buffer body 31a and an even number of second buffer bodies 31b arranged on both sides of the first buffer body 31a along the first direction, and a redundant avoidance space 33 is provided at the end of each second buffer body 31b.

[0073] Exemplarily, the height of the first buffer body 31 a is greater than the height of the second buffer body 31 b .

[0074] In the same battery cell group 21, an even number of battery cells 22 can be divided into two equal parts, and the redundant parts 223 of the two parts of battery cells 22 are bent in opposite directions. Figure 3 As can be understood, there is no redundant portion 223 between the two battery cells 22 in the middle of the battery cell group 21. Therefore, the corresponding buffer body 31 in the middle of the buffer assembly 30, that is, the end of the first buffer body 31a, does not need to be provided with a redundant avoidance space 33. However, there is a redundant portion 223 between the other two adjacent battery cells 22 in the battery cell group 21. Therefore, the ends of the other buffer bodies 31 in the buffer assembly 30, that is, the second buffer body 31b, all need to be provided with a redundant avoidance space 33.

[0075] It should also be noted that if Figure 2 Between adjacent battery cell groups 21, there will be two redundant parts 223 on the same side (such as above or below) along the third direction. If a buffer body 31 is set between two adjacent battery cell groups 21, a larger part of the end of the buffer body 31 needs to be provided with a redundant avoidance space 33, so that the thickness of the structure set at some positions of the buffer body 31 is relatively thin, which is not conducive to forming a reliable connection between the buffer body 31 and the shell 10, and will also cause difficulties in the overall molding of the buffer assembly 30 (for example, the thickness of some positions is relatively thin and cannot be injection molded). Therefore, the buffer body 31 may not be set between two adjacent battery cell groups 21.

[0076] like Figure 2 In some embodiments, the battery cell group 21 includes four battery cells 22. Figure 4 The buffer assembly 30 includes a first buffer body 31a and two second buffer bodies 31b.

[0077] In this embodiment, the two second buffer bodies 31b are fixedly connected to the first buffer body 31a, and the three can form a whole, thereby providing high strength to the buffer assembly 30. At the same time, it can also avoid the problems of high production costs caused by the excessive number of buffer bodies 31 included in the buffer assembly 30, and low assembly efficiency caused by the difficulty in aligning the buffer assembly 30 with the housing 10.

[0078] like Figure 5 , Figure 5The exploded view of the buffer assembly 30, the upper cover 301 and the bottom plate 302 is shown. In some embodiments, the housing 10 includes a Figure 5 The two cover plates 3 are spaced apart in the Z direction. Figure 1 , the battery cell stack 20 is arranged between the two cover plates 3. Figure 5 Along the third direction, a connection structure 34 is provided at the end of at least one buffer body 31 in the buffer assembly 30 , and the buffer body 31 is fixedly connected to at least one cover plate 3 through the connection structure 34 .

[0079] Illustratively, the two cover plates 3 include an upper cover 301 and a bottom plate 302 .

[0080] Exemplarily, the connection structure 34 can be a buckle, a plug-in column or a hot melt column protruding from the end of the buffer body 31; or, the connection structure 34 can also be a groove, a slot or a threaded hole for installing a screw set at the end of the buffer body 31.

[0081] Illustratively, a connection structure 34 is provided at the end of each buffer body 31 in the buffer assembly 30 .

[0082] Exemplarily, both ends of each buffer body 31 in the buffer assembly 30 are provided with connection structures 34 , that is, the buffer assembly 30 can be connected to the two cover plates 3 respectively.

[0083] For example, along the second direction (such as Figure 5 Buffer assemblies 30 are provided on both sides of the battery cell stack 20.

[0084] The connecting structure 34 is arranged at the end of the buffer body 31 along the third direction, so that the buffer assembly 30 is Figure 5 Any position (in the X direction) between the two cover plates 3 (in the middle or on both sides) can be reliably connected to the cover plates 3 via the connection structure 34, thereby fixing the buffer assembly 30 in the interior space of the housing 10. When the battery cell stack 20 moves, the buffer assembly 30, which is fixed relative to the housing 10, can generate a supporting force for the battery cell stack 20.

[0085] like Figure 5 In some embodiments, along the third direction, a heat-melting column passing through the adjacent cover plate 3 is provided at the end of the buffer body 31 , and the heat-melting column constitutes a connecting structure 34 .

[0086] Exemplarily, a through-hole 303 is provided at a corresponding position of the cover plate 3 for the hot melt column to pass through.

[0087] When assembling the battery module of this embodiment, the individual single cells 22 can be arranged and stacked along the first direction to obtain a cell stack 20. Afterwards, a preset pre-tightening force is applied to the cell stack 20 by a clamp, and two side panels 1 are installed on the cell stack 20. Afterwards, the upper cover 301 is installed on the cell stack 20, and the upper cover 301 is welded and fixed to the two installed side panels 1. After the upper cover 301 is installed, each buffer assembly 30 is plugged into the upper cover 301 through the hot melt column at one end of the buffer body 31. After all the buffer assemblies 30 are connected, the bottom plate 302 is installed on the cell stack 20. During the installation process, the hot melt column at the other end of all the buffer bodies 31 is plugged into the bottom plate 302. After completion, the bottom plate 302 and the two side panels 1 are welded and fixed.

[0088] After installing the upper cover 301 and the bottom plate 302, the hot melt pins can be melted to achieve a reliable fixed connection between the buffer assembly 30 and the upper cover 301 and the bottom plate 302. Finally, the two end plates 2 are installed, and each end plate 2 is snap-connected to the two side plates 1 respectively.

[0089] From the above, it can be seen that the connection between the buffer assembly 30 and the cover plate 3 is achieved by using the hot melt column. The connection process is relatively simple, which helps to reduce the difficulty of assembling the battery module.

[0090] Based on the same inventive concept and in combination with the description of the battery modules of the above embodiments, this embodiment provides a battery pack having the corresponding technical effects of the battery membrane groups of the above embodiments, which will not be described in detail here.

[0091] A battery pack includes the battery membrane group as described in the above embodiments.

[0092] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0093] The various embodiments in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The description of this application is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the application and to enable those skilled in the art to understand the application and design various embodiments with various modifications suitable for specific applications.

[0095] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0096] While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0097] The embodiments of the present 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 the present application should be included in the scope of protection of this application.

Claims

1. A battery module, characterized in that: include: case; A battery cell stack is disposed in the interior space of the housing, wherein the battery cell stack includes a plurality of battery cells arranged along a first direction; as well as A buffer assembly is provided at at least one end of the battery cell stack along a second direction, the buffer assembly is connected to the shell, and the second direction intersects with the first direction.

2. The battery module according to claim 1, wherein: The battery cell includes a battery cell body, and along the second direction, an orthographic projection of the buffer assembly on the battery cell stack coincides with an end portion of at least one of the battery cell bodies.

3. The battery module according to claim 2, characterized in that: The battery cell further includes a tab extending from the end of the battery cell body in a direction away from the battery cell body; the buffer assembly includes at least one buffer body, and the buffer body is provided with a tab avoidance space for the tab to pass through.

4. The battery module according to claim 3, characterized in that: The buffer body is arranged between adjacent tabs, and along the first direction, the avoidance spaces are located on two opposite sides of the buffer body.

5. The battery module according to claim 3, wherein: The buffer assembly includes at least two buffer bodies spaced apart and distributed along a first direction. The at least two buffer bodies are fixedly connected, and the tab avoidance space is defined between adjacent buffer bodies.

6. The battery module according to claim 5, characterized in that: The middle parts of the mutually close side walls of the adjacent buffer bodies are spaced apart to define through holes between the adjacent buffer bodies, and the through holes are configured as the tab avoidance spaces.

7. The battery module according to claim 3, characterized in that: Along the third direction, a redundant portion is provided on at least one side of the battery cell body, and the redundant portion is bent along the first direction. A redundant avoidance space is provided at the end of at least one buffer body in the same buffer assembly, and the redundant avoidance space is used to accommodate the redundant portion; the third direction is perpendicular to the first direction and the second direction respectively.

8. The battery module according to claim 7, characterized in that: The battery cell stack includes at least one battery cell group, each battery cell group includes an even number of battery cells; in the same battery cell group, the redundant parts of the battery cells are bent toward the outer side walls of the adjacent battery cell group; the buffer assembly corresponds to the battery cell group one by one, and the buffer assembly includes a first buffer body and an even number of second buffer bodies arranged on both sides of the first buffer body along a first direction, and the end of each second buffer body is provided with the redundant avoidance space.

9. The battery module according to claim 8, characterized in that: The battery cell group includes four battery cells, and the buffer assembly includes one first buffer body and two second buffer bodies.

10. The battery module according to claim 3, characterized in that: The shell includes two cover plates spaced apart along a third direction, and the battery cell stack is arranged between the two cover plates; along the third direction, the end of at least one of the buffer bodies in the buffer assembly is provided with a connecting structure, and the buffer body is fixedly connected to at least one of the cover plates through the connecting structure.

11. The battery module according to claim 10, characterized in that: Along the third direction, a heat-melting column passing through the adjacent cover plate is provided at the end of the buffer body, and the heat-melting column constitutes the connection structure.

12. A battery pack, characterized in that: The invention comprises the battery membrane assembly according to any one of claims 1 to 11.

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