Battery modules, battery packs, and power consumption devices

Abstract

To provide a battery module which improves the reliability of a battery.SOLUTION: A battery module comprises a shell, a cell assembly, and an elastic member, and the shell is provided with a first wall and a second wall which are arranged opposite to each other in a first direction. The cell assembly is housed in the shell and supported by the first wall. The elastic member and the cell assembly are arranged along a second direction together and in the first direction, and a gap exists between the elastic member and the second wall. The elastic member exceeds the battery cell assembly. The first wall of the shell supports the cell assembly, and a gap exists between the elastic member and the second wall in the first direction, and as a result, the elastic member can be conveniently assembled in the shell, and the risk of interference between the elastic member and the wall part of the shell is reduced. In the first direction, the elastic member exceeds the cell assembly, and as a result, when the battery module is subjected to external extrusion, impact, and other acting forces, the elastic member can bear external extrusion and impact before the cell assembly.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] This application relates to the field of battery technology, and particularly to battery modules, battery packs, and power-consuming devices.

Background Art

[0002] Batteries are widely used in fields such as portable electronic devices, electric vehicles, power tools, drones, and energy storage devices. As the application environment and conditions become increasingly complex, the requirements for battery reliability are getting higher.

Summary of the Invention

[0003] Embodiments of this application provide a battery module, a battery pack, and a power-consuming device to enhance the reliability of the battery.

[0004] Embodiments of this application provide a battery module including a housing, a cell assembly, and an elastic member. The housing has a first wall and a second wall oppositely arranged along a first direction. The cell assembly is housed in the housing and supported by the first wall. The elastic member is arranged along a second direction together with the cell assembly. There is a gap between the elastic member and the second wall along the first direction, and the elastic member extends beyond the cell assembly.

[0005] In the above technical solution, since the first wall of the housing supports the cell assembly and there is a gap between the elastic member and the second wall along the first direction, it facilitates the assembly of the elastic member into the housing and reduces the risk of interference between the elastic member and the wall of the housing. Along the first direction, since the elastic member extends beyond the cell assembly, when the battery module receives an external acting force such as pressing or impact, the elastic member can receive the external pressing or impact earlier than the cell assembly, reducing the damage to the cell assembly caused by the external acting force and enhancing the reliability of the battery module.

[0006] In one or more selective embodiments described above, the cell assembly comprises a plurality of cell units, which are stacked along a second direction. Each cell unit comprises a cell and a holder. The holder includes a first extension, which covers a portion of the cell. At least one first extension is located between the cell and the second wall along the first direction. The elastic member extends beyond the first extension along the first direction.

[0007] In the above proposed technology, the first extension can protect the cell by covering a portion of it, thereby reducing the risk of damage to the cell. Along the first direction, the first extension is located between the cell and the second wall, and the elastic member extends beyond the first extension. This allows the elastic member to receive external forces such as pressure or impact before the first extension when the battery module is subjected to such forces, thereby reducing damage to the cell due to external forces and increasing the reliability of the battery module.

[0008] In one or more of the above-described selective embodiments, the holder comprises a second extension, the second extension covering a portion of the cell. Along the first direction, at least one second extension is located between the cell and the first wall.

[0009] In the above proposed technology, the second extension can protect the cell by covering a portion of it, thereby reducing the risk of damage to the cell. By positioning at least one second extension between the cell and the first wall, the cell and the first wall come into indirect contact through the second extension, thus avoiding the risk of wear caused by direct contact between the cell and the first wall.

[0010] In one or more of the above-described selective embodiments, the cell comprises a cell case, an electrode assembly, and electrode terminals. The cell case comprises a main body and a first sealing portion. The electrode assembly is provided on the main body. The electrode terminals protrude out of the cell case from the first sealing portion. The first extension covers a portion of the first sealing portion, and / or the second extension covers a portion of the first sealing portion.

[0011] In the above proposed technology, the first extension can cover a part of the first sealing part, and / or the second extension can cover a part of the first sealing part, thereby protecting the first sealing part, improving the sealing performance of the cell, and thereby improving the reliability of the cell.

[0012] In one or more of the above-described selective embodiments, the cell case comprises two second sealing portions arranged opposite each other along a first direction. The two second sealing portions are located on either side of the main body, respectively, along the first direction. A first extension covers a portion of one second sealing portion and a portion of the main body, and / or a second extension covers a portion of another second sealing portion and a portion of the main body.

[0013] In the above proposed technology, the cell case is provided with two second sealing parts arranged opposite to each other along a first direction, which is advantageous not only for facilitating the assembly and molding of the cell but also for improving the sealing performance of the cell. The first extension can protect the second sealing part and the main body by covering a part of one second sealing part and a part of the main body, thereby reducing the risk of damage to the cell due to external forces such as pressing or impact. The second extension can protect the second sealing part and the main body by covering a part of another second sealing part and a part of the main body, thereby reducing the risk of damage to the cell due to external forces such as pressing or impact.

[0014] In one or more of the above-described selective embodiments, the holder includes a connecting portion, which connects a first extension and a second extension.

[0015] In the above proposed technology, the connecting portion connects the first extension portion and the second extension portion, which not only creates an integrated structure for the first extension portion, the second extension portion, and the connecting portion, but also has the advantage of improving the stability of the fitting between the holder and the cell.

[0016] In one or more of the above-described selective embodiments, the holder is integrally molded with the cell.

[0017] In the above proposed technology, integral molding of the holder with the cell not only facilitates connection between the holder and the cell, but also has advantages in that the holder has relatively good structural strength and a relatively stable connection relationship between the cell and the holder.

[0018] In one or more of the above-described selective embodiments, the elastic member comprises a base, a second connector, and at least one buffer portion. The base is connected to the cell assembly. The buffer portion connects the base to the second connector. Along the first direction, the second connector extends beyond the cell assembly, and / or the buffer portion extends beyond the cell assembly.

[0019] In the above proposed technology, along the first direction, the second connection portion extends beyond the cell assembly, and / or the buffer portion extends beyond the cell assembly. This allows the second connection portion and / or the buffer portion to receive external pressure or impact before the cell assembly when the battery module is subjected to external forces such as pressing or impact, thereby reducing damage to the cell assembly due to external forces and improving the reliability of the battery module.

[0020] In one or more of the above-described selective embodiments, the buffer portion comprises at least one first bending means provided between the base portion and the second connecting portion. The first bending means comprises a first segment and a second segment connected to each other. The angle between the first segment and the second segment is B, and 0° <B<90°である。

[0021] In the above proposed technology, the first segment and the second segment of the buffer are connected and arranged at an angle, which facilitates the deformation of the buffer and absorbs the force acting due to the expansion of the cell.

[0022] In one or more of the above-described selective embodiments, the elastic member is housed in the housing, and the second connection is fixed to the housing.

[0023] In the above proposed technology, the structure of the battery module is made more compact by housing the elastic member within the casing. By fixing the second connection part to the casing, the stability of the elastic member within the casing can be increased, and the risk of movement can be reduced.

[0024] In one or more of the above-described selective embodiments, the elastic member comprises two extensions extending beyond both ends of the base in a third direction. The two extensions are fixed to the housing. The first, second, and third directions are perpendicular to each other.

[0025] In the above-described technical proposal, when the cell expands, the second connection portion deforms along a direction away from the cell assembly to adapt to the cell expansion, thereby providing space for the cell to deform.

[0026] In one or more of the above-described selective embodiments, the housing is provided with a fixing portion, and the elastic member is positioned between the cell assembly and the fixing portion along the second direction.

[0027] In the above proposed technology, by providing the fixing portion on the side of the elastic member away from the cell assembly, the risk of separation between the cell assembly and the elastic member can be reduced, as can the risk of the elastic member and the cell assembly detaching from the housing. This is advantageous for integrally forming the housing, cell assembly, and elastic member, and makes the structure of the housing, cell assembly, and elastic member more compact.

[0028] In one or more of the above selective embodiments, it has an opening at one end along the second direction of the housing. The fixing part is provided at the end of the housing having the opening.

[0029] In the above technical solution, by providing the fixing part at the end of the housing having the opening, the cell assembly and the elastic member can be restricted within the housing, and the housing, the cell assembly and the elastic member are made into an integral structure. After the front cover is removed, it facilitates the independent removal and installation of the front cover without affecting the relative positional relationship between the cell assembly and the elastic member.

[0030] In one or more of the above selective embodiments, the housing includes a third wall and a fourth wall arranged opposite to each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The fixing part includes a first fixing part and a second fixing part provided at intervals along the third direction. The first fixing part and the second fixing part are respectively connected to the third wall and the fourth wall. The second connecting part abuts against the first fixing part and the second fixing part.

[0031] In the above technical solution, by connecting the first fixing part and the second fixing part to the third wall and the fourth wall arranged opposite to each other along the third direction respectively, the risk of interference between the first fixing part and the second fixing part and other structures can be reduced. By jointly restricting the position of the elastic member by the first fixing part and the second fixing part, the elastic member can abut more stably between the fixing part and the cell assembly.

[0032] In one or more of the above selective embodiments, the fixing part includes a third fixing part and a fourth fixing part provided at intervals along the first direction. The third fixing part and the fourth fixing part are respectively connected to the first wall and the second wall. The second connecting part abuts against the third fixing part and the fourth fixing part.

[0033] In the above proposed technology, the third and fourth fixing parts are connected to the first and second walls, respectively, thereby reducing the risk of interference between the third and fourth fixing parts and other structures. The third and fourth fixing parts work together to confine the cell assembly and elastic member within the housing, thereby reducing the risk of the cell assembly and elastic member detaching from the housing, and allowing the elastic member to contact the fixing part and the cell assembly more stably.

[0034] In one or more of the above-described selective embodiments, the elastic member comprises a plurality of buffer portions and a plurality of second connecting portions. The plurality of buffer portions are spaced apart along a first direction. Each second connecting portion is connected to the base via one buffer portion.

[0035] In the above proposed technology, the number of buffer sections and second connection sections may be multiple, making it easier to absorb the force acting due to the expansion and deformation of the cell.

[0036] In one or more of the above-described selective embodiments, the elastic member comprises two buffer portions and two second connecting portions. The two buffer portions are spaced apart along the first direction. The two second connecting portions are spaced apart along the first direction. Each of the two buffer portions is connected to both ends of the base along the first direction.

[0037] In the above proposed technology, both the buffer portion and the second connection portion are two in number, and the two buffer portions are arranged at intervals along the first direction, thereby allowing for rational use of the assembly space.

[0038] In one or more of the above-described selective embodiments, a reinforcing rib is provided at the base.

[0039] In the above proposed technology, reinforcing ribs are provided at the base to ensure high strength and reduce the risk of damage to the base.

[0040] In one or more of the above-described selective embodiments, the base, the buffer portion, and the second connecting portion are formed by bending a plate material.

[0041] In the above proposed technology, the base, buffer portion, and second connecting portion are formed by bending and shaping a plate material, which simplifies the structure, simplifies processing and manufacturing, strengthens the connection between the base and the buffer portion, and strengthens the connection between the buffer portion and the second connecting portion.

[0042] In one or more of the above-described selective embodiments, the cell is a softpack cell.

[0043] In one or more of the above-described selective embodiments, the embodiments of the present application provide a battery pack. The battery pack comprises a front cover connected to a housing and a battery module as described in any one of the above embodiments.

[0044] In the above proposed technology, the front cover, by being connected to the housing, not only serves to protect the internal structure of the housing but also has the advantage of improving the sealing performance of the battery pack, thereby improving the reliability of the battery pack.

[0045] Embodiments of the present invention further provide a power consumption device, the power consumption device comprising at least one battery pack described in any one embodiment described above.

[0046] In the above-described technical proposal, the reliability of the battery module and battery pack described in any one of the embodiments is good, which is advantageous for improving the reliability of the power consumption device to which power is supplied by this battery module and battery pack. [Brief explanation of the drawing]

[0047] To more clearly explain the technical concept of the embodiments of this application, the necessary drawings for the embodiments are briefly described below. It should be understood that the following drawings only show some embodiments of this application. [Figure 1]Figure 1 is a schematic diagram of a battery pack according to several embodiments of the present invention. [Figure 2] Figure 2 is an exploded view of a battery pack according to some embodiments of the present invention. [Figure 3] Figure 3 is an exploded view of a housing according to several embodiments of the present invention. [Figure 4] Figure 4 is a schematic diagram of the structure of a second wall according to some embodiments of the present invention. [Figure 5] Figure 5 is a schematic diagram of a part of the structure of a battery module according to some embodiments of the present invention. [Figure 6] Figure 6 is a schematic diagram of the cell structure according to some embodiments of the present invention. [Figure 7] Figure 7 is an exploded view of a cell according to some embodiments of the present invention. [Figure 8] Figure 8 is a cross-sectional view of a battery pack according to several embodiments of the present invention. [Figure 9] Figure 9 is an enlarged view of A1 in Figure 8. [Figure 10] Figure 10 is a schematic diagram of the structure of a cell unit according to some embodiments of the present invention. [Figure 11] Figure 11 is an enlarged view of A2 in Figure 10. [Figure 12] Figure 12 is a schematic diagram of the structure of a cell unit from a different perspective according to some embodiments of the present application. [Figure 13] Figure 13 is an enlarged view of A3 in Figure 12. [Figure 14] Figure 14 is a schematic diagram of the structure of a cell assembly according to some embodiments of the present invention. [Figure 15] Figure 15 is a schematic diagram of the fitting between a part of the housing and the elastic member. [Figure 16] Figure 16 is a schematic diagram of a part of the structure of a battery module according to another embodiment of the present application. [Figure 17] Figure 17 is a schematic diagram of the structure of an elastic member according to some embodiments of the present invention. [Figure 18]Figure 18 is a schematic diagram of the structure of an elastic member from a different perspective according to some embodiments of the present application. [Figure 19] Figure 19 shows an elastic member according to some embodiments of the present application, viewed along a second direction. [Figure 20] Figure 20 shows an elastic member according to some embodiments of the present application, viewed along the direction opposite to the second direction. [Modes for carrying out the invention]

[0048] Hereinafter, in order to further clarify the object, technical proposal, and advantages of the embodiments of the present invention, the technical proposal relating to the embodiments of the present invention will be clearly and completely described with reference to the drawings of the embodiments of the present invention. It will be clear that the embodiments described are not all embodiments, but merely some embodiments of the present invention. In general, the components of the embodiments of the present invention shown in the drawings can be arranged and designed in a variety of different configurations.

[0049] Therefore, the following detailed description of embodiments of the present application relating to the drawings is not intended to limit the scope of protection of the present application, but merely to illustrate selected embodiments of the present application. The embodiments and features of the embodiments in the present application can be combined with each other, as long as they do not contradict each other.

[0050] It should be noted that similar symbols and letters represent the same terms in the following diagrams, so once a term is defined in one diagram, further definition and explanation are not required in subsequent diagrams.

[0051] Furthermore, in the description of the embodiments of this application, the directions and positional relationships indicated are based on the directions and positional relationships shown in the drawings, or the directions and positional relationships in which the product relating to this application is normally arranged when it is used, or directions and positional relationships that a person skilled in the art would generally understand. This is merely for the purpose of facilitating and simplifying the description of this application, and does not express or imply that the devices or elements mentioned necessarily have a specific direction, or are configured and operated in a specific direction, and therefore should not be understood as limiting this application. In addition, terms such as "first," "second," and "third" are used solely to distinguish the descriptions and should not be understood as expressing or implying relative importance.

[0052] Currently, with the development of the market, the applications of battery modules are expanding more and more. Battery modules are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as power tools, drones, and energy storage devices. As the application fields of battery modules gradually expand, the market demand for them continues to grow.

[0053] The development of battery module technology requires simultaneous consideration of multiple design elements, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery module becomes a crucial consideration as environmental conditions and / or internal conditions of the battery module change.

[0054] As the operating environments for battery modules become increasingly complex, they are susceptible to external forces such as pressure and impact. When these external forces are transmitted through the casing to the cells inside the battery module, the cells can be damaged, resulting in a decrease in the reliability of the battery module.

[0055] Based on the above considerations, an embodiment of the present invention provides a battery module to solve the problem of reduced reliability of the battery module due to external forces. The battery module comprises a housing, a cell assembly, and an elastic member. The housing has a first wall and a second wall that are arranged opposite each other along a first direction. The cell assembly is housed within the housing and supported by the first wall. The elastic member is provided within the housing and is arranged together with the cell assembly along a second direction. Along the first direction, there is a gap between the elastic member and the second wall, and the elastic member extends beyond the cell assembly.

[0056] The first wall of the housing supports the cell assembly, and a gap exists between the elastic member and the second wall along the first direction, facilitating the assembly of the elastic member into the housing and reducing the risk of interference between the elastic member and the housing wall. Along the first direction, the elastic member extends beyond the cell assembly, allowing it to receive external forces such as pressure and impact before the cell assembly when the battery module is subjected to such forces. This reduces damage to the cell assembly from external forces and enhances the reliability of the battery module.

[0057] Embodiments of the present invention provide a power consumption device that uses a battery pack or battery module as a power source. The power consumption device may be, but is not limited to, an electronic device, a power tool, an electric vehicle, a drone, or an energy storage device. Here, electronic devices may include mobile phones, tablets, laptops, etc. Power tools may include electric drills, electric saws, etc. Electric vehicles may include electric cars, electric motorcycles, electric bicycles, etc.

[0058] For the sake of explanation, some electrode terminals are not shown bent in the diagram.

[0059] As shown in Figures 1 and 2, an embodiment of the present invention provides a battery pack 100 comprising a front cover 10 and a battery module 20.

[0060] The battery module 20 comprises a housing 21 and a cell assembly 22. The cell assembly 22 is housed within the housing 21. The housing 21 has a first wall 213 and a second wall 214 that are positioned opposite each other along a first direction X. The first wall 213 supports the cell assembly 22.

[0061] A housing space 211 is formed in the housing 21. The cell assembly 22 is housed within the housing space 211.

[0062] In some embodiments, the housing 21 may be a one-piece molded structure. An opening 212 is formed at one end of the housing space 211 along the second direction Y, and the front cover 10 covers the opening 212. By covering the opening 212 of the housing 21 of the battery module 20, the front cover 10 not only protects the structure inside the housing 21 but is also advantageous in improving the sealing performance of the battery pack 100, thereby improving the reliability of the battery pack 100. The second direction Y is perpendicular to the first direction X.

[0063] The front cover 10 covers the opening 212 by being connected to the housing 21. The front cover 10 and the housing 21 may be connected by a removable connection, such as a bolt connection or a snap connection, to facilitate the removal of the front cover 10 and to facilitate independent maintenance of the housing 21 and the front cover 10. The front cover 10 and the housing 21 may be connected by a fixed connection, such as a welded connection or an adhesive connection, to improve the connection stability between the front cover 10 and the housing 21 and the sealing performance between the housing 21 and the front cover 10.

[0064] In other embodiments, the housing 21 may be formed by connecting several independent members in a certain connection direction.

[0065] The front cover 10 is provided with an input terminal 10a and an output terminal 10b, which are electrically connected to the total positive and total negative terminals of the cell assembly 22, respectively. The input terminal 10a and output terminal 10b are for electrically connecting to external devices to charge the battery pack 100 or to release the electrical energy from the battery pack 100.

[0066] The battery pack 100 further comprises a circuit board 30. The circuit board 30 is located between the front cover 10 and the cell assembly 22 along a second direction Y. Optionally, the circuit board 30 may include a BMS (Battery Management System) board. Circuit elements, such as information gathering components, can be provided on the circuit board 30.

[0067] As shown in Figures 2 and 3, the housing 21 comprises a plurality of wall sections that together form the housing space 211. The plurality of wall sections may be integrally molded to form the housing 21. The housing 21 may be formed using integral molding methods such as casting, injection molding, or press working.

[0068] Multiple wall sections may be formed as a whole by integrally molding some of the wall sections and connecting them with other wall sections in a certain connection relationship, so as to form a housing 21 having a storage space 211.

[0069] In other embodiments, each wall of the housing 21 can be provided separately and connected by a certain connection method to form the housing 21. The connection method between the wall sections may include, but is not limited to, welding or adhesive connections.

[0070] As shown in Figures 2 and 3, the housing 21 comprises a first wall 213, a second wall 214, a third wall 215, a fourth wall 216, and a fifth wall 217. The first wall 213 and the second wall 214 are positioned opposite each other along a first direction X. The third wall 215 and the fourth wall 216 are positioned opposite each other along a third direction Z. The opening 212 and the fifth wall 217 are positioned opposite each other along a second direction Y. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0071] The first wall 213 is subjected to the gravity of the cell assembly 22 in order to support the cell assembly 22. The third wall 215 and the fourth wall 216 are connected to the ends of the first wall 213 along the third direction Z, respectively. The first wall 213, the third wall 215, and the fourth wall 216 can be molded as a single unit.

[0072] The second wall 214 is connected to the end of the third wall 215 opposite to the first wall 213, and to the end of the fourth wall 216 opposite to the first wall 213. The second wall 214 and the third wall 215 may be detachable connections to facilitate maintenance and replacement of the second wall 214 and the third wall 215. The detachable connections may be bolted connections, snap connections, etc.

[0073] The second wall 214 and the third wall 215 may be fixedly connected to facilitate the manufacturing and molding of the second wall 214 and the third wall 215. The fixed connection may be a welded connection, an adhesive connection, or the like.

[0074] The second wall 214 and the fourth wall 216 may be connected by a removable connection to facilitate maintenance and replacement of the second wall 214 and the fourth wall 216. The removable connection may be a bolted connection, a snap connection, or the like.

[0075] The second wall 214 and the fourth wall 216 may be fixedly connected to facilitate the manufacturing and molding of the second wall 214 and the fourth wall 216. The fixed connection may be a welded connection, an adhesive connection, or the like.

[0076] The first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 are all connected to the fifth wall 217. The fifth wall 217 and the opening 212 are positioned opposite each other along the second direction Y.

[0077] The first wall 213, the second wall 214, the third wall 215, the fourth wall 216, and the fifth wall 217 may be fixed connections such as welded connections or adhesive connections.

[0078] The first wall 213, the second wall 214, the third wall 215, the fourth wall 216, and the fifth wall 217 may be detachable connections to facilitate maintenance and replacement of the various parts of the housing 21. The detachable connections may be bolt connections, snap connections, or the like.

[0079] In other embodiments, the first wall 213, the second wall 214, the third wall 215, the fourth wall 216, and the fifth wall 217 may be integrally molded to facilitate the manufacturing and molding of the housing 21, thereby providing the housing 21 with better structural strength.

[0080] As shown in Figures 2 and 3, two first position limiting members 2131 are provided on the first wall 213, and the two first position limiting members 2131 are spaced apart along the third direction Z.

[0081] The first position limiting member 2131 protrudes from the inner surface of the first wall 213. When the cell assembly 22 is supported by the first wall 213, the two first position limiting members 2131 can restrict the movement of the cell assembly 22 along the third direction Z and the direction opposite to the third direction Z. This increases the stability of the cell assembly 22 within the housing 21.

[0082] The first position limiting member 2131 may be formed by press working from the outer surface of the first wall 213. In the press working process, a recess is formed on the outer surface of the first wall 213, and the first position limiting member 2131 protruding from the inner surface of the first wall 213 is formed.

[0083] The inner surface of the first wall 213 refers to the surface of the first wall 213 that faces the cell assembly 22 along the first direction X. The outer surface of the first wall 213 refers to the surface of the first wall 213 that is away from the cell assembly 22 along the direction opposite to the first direction X.

[0084] As shown in Figure 4, two second position limiting members 2141 are provided on the second wall 214. The two second position limiting members 2141 are spaced apart along the third direction Z.

[0085] The second position limiting member 2141 protrudes from the inner surface of the second wall 214. The two second position limiting members 2141 can restrict the movement of the cell assembly 22 along the third direction Z and the direction opposite to the third direction Z. This increases the stability of the cell assembly 22 within the housing 21.

[0086] The second position limiting member 2141 can be formed by press working from the outer surface of the second wall 214. In the press working process, a recess is formed on the outer surface of the second wall 214, forming the second position limiting member 2141 that protrudes from the inner surface of the second wall 214.

[0087] The inner surface of the second wall 214 refers to the surface of the second wall 214 that faces the cell assembly 22 in the direction opposite to the first direction X. The outer surface of the second wall 214 refers to the surface of the second wall 214 that is away from the cell assembly 22 in the direction X.

[0088] As shown in Figures 5 and 6, the cell assembly 22 comprises a plurality of cell units 221, which are stacked along a second direction Y. "Pluripotent" refers to two or more units. Each cell unit 221 comprises a cell 2211. The cell 2211 may be a hard-shell cell or a soft-pack cell.

[0089] Figures 6 and 7 show the case where cell 2211 is a soft pack cell. As shown in Figures 6 and 7, cell 2211 comprises a cell case 22111, an electrode assembly 22112, and electrode terminals 22113. The electrode assembly 22112 is housed inside the cell case 22111. The material of the cell case 22111 may be an aluminum plastic film or a metal plastic film, etc.

[0090] In some embodiments, the cell case 22111 comprises a main body 22111a and a first sealing portion 22111b, the first sealing portion 22111b being connected to a first end face 2211a of the main body 22111a along a third direction Z. The electrode assembly 22112 is housed within the main body 22111a. The electrode terminals 22113 are connected to the electrode assembly 22112 and protrude out of the cell case 22111 from the first sealing portion 22111b.

[0091] Cell 2211 has two electrode terminals 22113, both of which are connected to electrode assembly 22112, and the polarity of the two electrode terminals 22113 is opposite. That is, one electrode terminal 22113 is the positive terminal and the other electrode terminal 22113 is the negative terminal.

[0092] In some embodiments, the two electrode terminals 22113 may be located at the same end along the third direction Z of the cell 2211. By having the two electrode terminals 22113 extend out of the cell case 22111 from the same first sealing portion 22111b, it becomes easier to rationally arrange the cell assembly 22 within the housing 21, making full use of the internal space of the housing 21 and facilitating electrical connections between the two electrode terminals 22113 and other structures. In this case, the cell case 22111 may have one first sealing portion 22111b.

[0093] As shown in Figures 5 to 7, in other embodiments, the two electrode terminals 22113 may be located at opposite ends of the cell 2211. The cell case 22111 comprises two first sealing portions 22111b. The two first sealing portions 22111b are located on either side of the main body portion 22111a along a third direction Z. One first sealing portion 22111b is connected to the first end face 2211a of the main body portion 22111a, and the other first sealing portion 22111b is connected to the second end face 2211b of the main body portion 22111a. The first end face 2211a and the second end face 2211b are arranged opposite each other along the third direction Z. By having the two electrode terminals 22113 located at opposite ends of the cell 2211, the risk of short-circuiting the cell assembly 22 can be reduced.

[0094] In some embodiments, the cell case 22111 comprises two second sealing portions 22111c arranged opposite each other along a first direction X. The two second sealing portions 22111c are located on either side of the main body portion 22111a along the first direction X. This not only facilitates the assembly and molding of the cell 2211 but is also advantageous in improving the sealing performance of the cell 22211.

[0095] Multiple cells 2211 may be connected in series or in parallel, or some cells 2211 in a group of multiple cells 2211 may be connected in series and others may be connected in parallel.

[0096] As shown in Figure 5, the cell assembly 22 further comprises a first conductive member 222 and a second conductive member 223. The first conductive member 222 is electrically connected to one electrode terminal 22113 of the cell 2211 so as to form the total positive electrode of the cell assembly 22. The second conductive member 223 is electrically connected to the other electrode terminal 22113 of the cell 2211 so as to form the total negative electrode of the cell assembly 22. The total positive electrode and the total negative electrode are electrically connected to the input terminal 10a and the output terminal 10b, respectively.

[0097] In some embodiments, as shown in Figures 2, 8, and 9, the battery module 20 further comprises an elastic member 23. The elastic member 23 is arranged together with the cell assembly 22 along a second direction Y. Here, along the first direction X, a gap Q1 exists between the elastic member 23 and the second wall 214, and the elastic member 23 extends beyond the cell assembly 22.

[0098] The first wall 213 of the housing 21 supports the cell assembly 22, and a gap exists between the elastic member and the second wall along the first direction X, facilitating the assembly of the elastic member 23 into the housing 21 and reducing the risk of interference between the elastic member 23 and the wall of the housing 21. Along the first direction X, the elastic member 23 extends beyond the cell assembly 22, so that when the battery module 20 is subjected to external forces such as pressing or impact, the elastic member 23 can receive the external pressing or impact before the cell assembly 22, reducing damage to the cell assembly 22 due to external forces and increasing the reliability of the battery module 20.

[0099] In some embodiments, the elastic member 23 is configured to provide expansion space for the cell assembly 22. The elastic member 23 is compressible or expandable in a second direction Y. When a cell 2211 expands, the cell assembly 22 presses against the elastic member 23, compressing the elastic member 23 along the second direction Y, thereby absorbing the amount of expansion of the cell 2211 and providing space for the expansion of the cell 2211. The elastic member 23 can also be used to keep each cell unit 221 in contact with the other, which makes the structure of the cell assembly 22 more compact and reduces the risk of movement of the cell units 221 within the housing 21.

[0100] Along the first direction X, the cell assembly 22 has a first end 22a closest to the second wall 214, and the elastic member 23 extends beyond the first end 22a. That is, the elastic member 23 extends beyond the end of the cell assembly 22 closest to the second wall 214. In this way, when the battery module 20 is subjected to an external force in the first direction X, the elastic member 23 is always able to receive the external force before the cell assembly 22, thereby reducing damage to the cell assembly 22 and improving the reliability of the battery module 20.

[0101] The material of the elastic member 23 includes, but is not limited to, metal, plastic, etc.

[0102] In an embodiment in which the battery pack 100 includes a circuit board 30, the elastic member 23 is provided between the cell assembly 22 and the circuit board 30 along the second direction Y.

[0103] As shown in Figures 10 to 13, in some embodiments, the cell unit 221 includes a holder 2212. The holder 2212 is provided on the cell 2211.

[0104] In some embodiments, the holders 2212 of two adjacent cell units 221 may be in contact along a second direction Y. The contact of the holders 2212 of two adjacent cell units 221 can mitigate the problem of damage due to contact friction between adjacent cells 2211, thereby increasing the reliability of the cells 2211 and extending the service life of the cells 2211.

[0105] Of course, in other embodiments, the main body portions 22111a of the cell cases 22111 of two adjacent cell units 221 may be in contact.

[0106] The holder 2212 is closer to the second wall 214 than to the cell 2211 along the first direction X. The end of the holder 2212 facing the second wall 214 is the first end 22a. By extending beyond the end of the holder 2212 facing the second wall 214, the elastic member 23 can receive external forces such as pressure or impact before the holder 2212 when the battery module 20 is subjected to such forces, thereby reducing damage to the cell 2211 due to external forces and thereby increasing the reliability of the battery module 20.

[0107] In some embodiments, the holder 2212 includes a first extension 22121 that covers a portion of the cell 2211.

[0108] In some embodiments, at least one first extension 22121 is located between the cell 2211 and the second wall 214 along a first direction X. Along the first direction X, the elastic member 23 extends beyond the first extension 22121.

[0109] Along the first direction X, one end of the first extension 22121 facing the second wall 214 is the first end 22a of the cell assembly 22. When the battery module 20 is subjected to external forces such as pressing or impact, the elastic member 23 can receive the external pressing or impact before the holder 2212, thereby reducing damage to the cell 2211 due to external forces and improving the reliability of the battery module 20.

[0110] The first extension 22121 covers a portion of the cell case 22111, thereby providing good protection for the cell 2211 and reducing the risk of damage to the cell 2211 when the battery module 20 is subjected to external forces such as pressure or impact.

[0111] In some embodiments, the first extension 22121 protects the first sealing portion 22111b by covering a part of it, thereby reducing the risk of damage to the cell 2211 due to external forces such as pressing or impact.

[0112] In some embodiments, the first extension 22121 protects the second sealing portion 22111c and the main body portion 22111a by covering a portion of one second sealing portion 22111c and a portion of the main body portion 22111a, thereby reducing the risk of damage to the cell 2211 due to external forces such as pressing or impact.

[0113] The number of first extensions 22121 may be one or more. As shown in Figures 10 and 11, there are two first extensions 22121. The two first extensions 22121 are spaced apart along the third direction Z, and each first extension 22121 covers a portion of the first sealing portion 22111b, a portion of the main body portion 22111a, and a portion of the second sealing portion 22111c. This can serve to better protect the cell 2211 and also reduce the weight of the cell unit 221.

[0114] In some embodiments, the holder 2212 includes a second extension 22122, as shown in Figures 12 and 13. The second extension 22122 covers a portion of the cell 2211.

[0115] In some embodiments, at least one second extension 22122 can serve to protect the cell 2211 by being positioned between the cell 2211 and the first wall 213 along a first direction X.

[0116] The second extension 22122 covers a portion of the cell case 22111, thereby providing good protection for the cell 2211 and reducing the risk of damage to the cell 2211 when the battery module 20 is subjected to external forces such as pressure or impact.

[0117] In some embodiments, the cells 2211 are connected in series, with the first extensions 22121 and the second extensions 22122 alternating sequentially along the second direction Y (as shown in Figure 14).

[0118] In some embodiments, the second extension 22122 protects the first sealing portion 22111b by covering a part of it, thereby reducing the risk of damage to the cell 2211 due to external forces such as pressing or impact.

[0119] In some embodiments, the first extension 22121 covers a portion of the first sealing portion 22111b, and the second extension 22122 covers a portion of the first sealing portion 22111b.

[0120] In some embodiments, the second extension 22122 protects the second sealing portion 22111c and the main body portion 22111a by covering a portion of another second sealing portion 22111c and a portion of the main body portion 22111a, thereby reducing the risk of damage to the cell 2211 due to external forces such as pressing or impact.

[0121] The number of second extensions 22122 may be one or more. As shown in Figures 10, 11, 12, and 13, there are two second extensions 22122. The two second extensions 22122 are spaced apart along the third direction Z. Each second extension 22122 covers a portion of the first sealing portion 22111b, a portion of the main body portion 22111a, and a portion of the second sealing portion 22111c. This can serve to better protect the cell 2211 and also reduce the weight of the cell unit 221.

[0122] In some embodiments, the holder 2212 includes a connecting portion 22123 that connects a first extension 22121 and a second extension 22122. This arrangement is advantageous not only for forming an overall structure with the first extension 22121, the second extension 22122, and the connecting portion 22123, but also for improving the stability of the fit between the holder 2212 and the cell 2211.

[0123] In an embodiment where there are two first extensions 22121 and two second extensions 22122, there may be two connecting portions 22123. One connecting portion 22123 connects one first extension 22121 to one second extension 22122, and the other connecting portion 22123 connects the other first extension 22121 to the other second extension 22122.

[0124] The connecting portion 22123 may cover a part of the first sealing portion 22111b and a part of the main body portion 22111a. This can better protect the cell 2211 and is also advantageous in improving the sealing performance of the cell 2211.

[0125] In some embodiments, the connecting portion 22123 covers at least a portion of the first end face 2211a, thereby limiting deformation of the main body portion 22111a, reducing the risk of bulging deformation at the first end face 2211a, and improving the reliability of the battery module 20.

[0126] In some embodiments, the connector 22123 covers a portion of the first seal 22111b, which is advantageous for enhancing protection to the first seal 22111b.

[0127] There are various ways in which the holder 2212 can be attached to the cell 2211. For example, the holder 2212 can be bonded to the cell 2211, or it can be welded to the cell 2211.

[0128] In some embodiments, the holder 2212 is integrally molded with the cell 2211, which not only facilitates the connection between the holder 2212 and the cell 2211, but also benefits the holder 2212 from having good structural strength and a stable connection between the cell 2211 and the holder 2212. Here, integral molding means that the holder 2212 and the cell 2211 are directly fixed together. Methods of integral molding include, but are not limited to, injection molding processes.

[0129] In some embodiments, after an injection process provides insulating material around the cell 2211, the insulating material hardens to form a holder 2212, and the holder 2212 and cell 2211 are bonded together. For example, the cell 2211 is placed in a mold, insulating material is poured into the mold, the insulating material hardens to form a holder 2212, and after it is bonded to the cell 2211, the holder 2212 and cell 2211 are removed from the mold.

[0130] In some embodiments, the insulating material includes, but is not limited to, a sealant and an effervescent gum.

[0131] In some embodiments, the injection molding process includes the following: placing the cell 2211 in a mold; an injection molding apparatus heating and melting an insulating material; the molten insulating material flowing into the mold; the insulating material curing to form a holder 2212, which is then bonded to the cell 2211, after which the holder 2212 and cell 2211 are removed from the mold. Selectively, the insulating material includes polyamide.

[0132] In some embodiments, the holder 2212 is an insulating holder, which can reduce the risk of short circuits between the holder 2212 and the cell 2211.

[0133] In some embodiments, as shown in Figures 15 and 16, a fixing portion 24 is provided on the housing 21. The elastic member 23 is located between the cell assembly 22 and the fixing portion 24 along a second direction Y. The fixing portion 24 is provided on the side of the elastic member 23 away from the cell assembly 22, thereby reducing the risk of separation of the cell assembly 22 and the elastic member 23, and also reducing the risk of the elastic member 23 and the cell assembly 22 detaching from the housing 21, which is advantageous for integrally forming the housing 21, cell assembly 22 and elastic member 23, and making the structure of the housing 21, cell assembly 22 and elastic member 23 more compact.

[0134] Along the second direction Y, one end of the elastic member 23 abuts against the cell assembly 22. The elastic member 23 and the cell assembly 22 may be in direct contact, i.e., the elastic member 23 and the cell assembly 22 may be in indirect contact. For example, a buffer member Q2 is provided between the elastic member 23 and the cell assembly 22, and the elastic member 23 and the cell assembly 22 are in indirect contact via the buffer member Q2. The buffer member Q2 may be made of foam.

[0135] Along the second direction Y, the other end of the elastic member 23 abuts against the fixing part 24. The elastic member 23 and the fixing part 24 may be in direct contact, that is, the elastic member 23 and the fixing part 24 may be in direct contact. The elastic member 23 and the fixing part 24 may be in indirect contact. For example, a buffer member Q2 is provided between the elastic member 23 and the fixing part 24, and the elastic member 23 and the fixing part 24 are in indirect contact via the buffer member Q2. The buffer member Q2 may be made of foam.

[0136] As shown in Figures 17 to 20, in some embodiments, the elastic member 23 comprises a base portion 231, a second connecting portion 232, and at least one buffer portion 233, the base portion 231 being connected to the cell assembly 22, and the buffer portion 233 connecting the base portion 231 and the second connecting portion 232.

[0137] In some embodiments, along the first direction X, the second connection portion 232 extends beyond the cell assembly 22, and / or the buffer portion 233 extends beyond the cell assembly 22.

[0138] The base 231 is connected to the cell assembly 22. In some embodiments, the base 231 is connected to the cell unit 221 closest to the elastic member 23 in the cell assembly 22. Selectively, the base 231 is connected in contact with the cell unit 221. Selectively, the base 231 and the cell unit 221 may be used to connect to other components. The base 231 is positioned to apply pressure to the cell unit 221.

[0139] In some embodiments, the projection of the main body 22111a is located within the base 231 along a first direction X, which is advantageous for the base 231 to apply pressure to the main body 22111a.

[0140] The second connector 232 may be connected to the fixing part 24. Selectively, the second connector 232 may be connected in contact with the fixing part 24. Selectively, the second connector 232 and the fixing part 24 may be used to connect to other components.

[0141] As cell 2211 expands, the distance between the base 231 and the second connection 232 along the second direction Y changes, and the buffer 233 can adapt to the change in distance between the base 231 and the second connection 232, thereby adapting to the expansion of cell 2211.

[0142] The base portion 231 abuts against the cell assembly 22, and the second connecting portion 232 abuts against the fixing portion 24, thereby facilitating the interaction between the cell assembly 22 and the fixing portion 24 and the elastic member 23, and the buffer portion 233 can adapt to changes in the distance between the base portion 231 and the second connecting portion 232, providing space for the expansion of the cell 2211.

[0143] The structure of the buffer portion 233 varies. For example, the buffer portion 233 may have a semi-circular arc structure, an S-shaped structure, or a Z-shaped structure. As shown in Figures 17 to 20, in some embodiments, the buffer portion 233 is a bent structure provided between the base portion 231 and the second connecting portion 232. This simplifies the structure, simplifies manufacturing, and allows for good adaptation to changes in the distance between the base portion 231 and the second connecting portion 232.

[0144] As shown in Figures 17 and 18, in some embodiments, the buffer portion 233 includes at least one first bending means 233a provided between the base portion 231 and the second connecting portion 232. The first bending means 233a includes a first segment 2331 and a second segment 2332 that are connected to each other. The first segment 2331 and the second segment 2332 are arranged to form an angle.

[0145] The buffer portion 233 is provided such that the first segment 2331 and the second segment 2332 are connected and form an angle, facilitating the deformation of the buffer portion 233 and absorbing the acting force due to the expansion of the cell 2211.

[0146] The angle between the first segment 2331 and the second segment 2332 is B, where 0° < B < 90°. That is, the first segment 2331 and the second segment 2332 may be arranged to form an acute angle.

[0147] The buffer portion 233 may include one first bending means 233a or may include a plurality of first bending means 233a. In an embodiment where the buffer portion 233 includes a plurality of first bending means 233a, the plurality of first bending means 233a are sequentially connected along the second direction Y, which is advantageous for increasing the adjustment range of the distance between the base 231 and the second connection portion 232, and thereby enabling better adaptation to the expansion of the cell 2211.

[0148] One of the first bending means 233a among the plurality of first bending means 233a is connected to the base 231, and the other first bending means 233a among the plurality of first bending means 233a is connected to the second connection portion 232.

[0149] FIG. 18 shows the case where the buffer portion 233 includes one first bending means 233a. One end of the first segment 2331 away from the second segment 2332 in this first bending means 233a is connected to the base 231, and one end of the second segment 2332 away from the first segment 2331 is connected to the second connection portion 232. The angle between the first segment 2331 and the base 231 is provided as an acute angle, and the angle between the second segment 2332 and the second connection portion 232 is provided as an acute angle. The buffer portion 233, the base 231, and the second connection portion 232 including one first bending means 233a form an M-shaped elastic member 23.

[0150] As cell 2211 expands, the distance along the second direction Y between the base 231 and the second connection 232 decreases, the angle between the first segment 2331 and the second segment 2332 decreases, the angle between the base 231 and the first segment 2331 decreases, and the angle between the second connection 232 and the second segment 2332 decreases.

[0151] The elastic member 23 may have one buffer portion 233 or multiple buffer portions 233. In an embodiment in which the elastic member 23 has multiple buffer portions 233, at least one buffer portion 233 extends beyond the cell assembly 22 along the first direction X.

[0152] As shown in Figures 17 to 20, the multiple buffer sections 233 are arranged at intervals along the first direction X. Each buffer section 233 connects the base section 231 to the second connecting section 232. By connecting the multiple buffer sections 233 between the base section 231 and the second connecting section 232, the system can adapt well to changes in the distance between the base section 231 and the second connecting section 232.

[0153] As shown in Figures 17 to 20, in an embodiment in which the elastic member 23 comprises a plurality of buffer portions 233, the elastic member 23 further comprises a plurality of second connecting portions 232. One second connecting portion 232 is provided corresponding to each buffer portion 233. Each second connecting portion 232 is connected to the base portion 231 via one buffer portion 233. The number of buffer portions 233 and second connecting portions 232 may be multiple. This is advantageous for absorbing the force acting due to the expansion deformation of the cell 2211.

[0154] Exemplary, as shown in Figures 17 to 20, the elastic member 23 comprises two buffer portions 233 and two second connecting portions 232. The two buffer portions 233 are spaced apart along a first direction X. The two second connecting portions 232 are spaced apart along the first direction X. Each of the two buffer portions 233 is connected to both ends of the base portion 231 along the first direction X. Since there are two buffer portions 233 and two second connecting portions 232, and the two buffer portions 233 are spaced apart along the first direction X, the assembly space can be used rationally.

[0155] As shown in Figures 17 to 20, in some embodiments, reinforcing ribs 2311 are provided on the base 231 so that the base 231 has high strength and is less susceptible to damage.

[0156] The shape of the reinforcing rib 2311 may be a long, strip-like structure extending along the first direction X. There may be one or more reinforcing ribs 2311. In embodiments where there are multiple reinforcing ribs 2311, the multiple reinforcing ribs 2311 are arranged at intervals along the third direction Z. Figures 17, 19, and 20 show the case where there are four reinforcing ribs 2311.

[0157] There are various methods for forming the elastic member 23. For example, the base 231, the second connecting portion 232, and the cushioning portion 233 are independent parts and are connected together by a detachable or fixed connection to form the elastic member 23. In other embodiments, the elastic member 23 may be integrally molded. For example, the base 231, the cushioning portion 233, and the second connecting portion 232 are formed by bending a sheet of material. This simplifies the structure, simplifies processing and manufacturing, strengthens the connection between the base 231 and the cushioning portion 233, and strengthens the connection between the cushioning portion 233 and the second connecting portion 232.

[0158] In some embodiments, the elastic member 23 is housed in the housing 21, and the second connecting portion 232 is fixed to the housing 21.

[0159] In some embodiments, fastening includes, but is not limited to, contact, bonding, welding, locking with fasteners, and snap connections.

[0160] In some embodiments, the elastic member 23 is secured by the housing 21. After the front cover 10 is removed, the elastic member 23 is secured to the housing 21. This facilitates maintenance and replacement of the battery pack 100.

[0161] In some embodiments, the base 231 has a second end 2312 facing the second wall 214, and the second connecting portion 232 has a third end 2321 facing the second wall 214. One of at least one buffer portion 233 connects the second end 2312 and the third end 2321. The second end 2312 and / or the third end 2321 are the ends of the elastic member 23 closest to the second wall 214 (see Figure 9).

[0162] The third end 2321 and the second end 2312 may be located at the same height in the second direction Y. The distance between the third end 2321 and the second wall 214 is the same as the distance between the second end 2312 and the second wall 214. In this case, when the battery module 20 is subjected to an external force, the third end 2321 and the second end 2312 can work together to resist the external force, thereby allowing the elastic member 23 to withstand greater external pressing and impact forces, reducing the risk of the elastic member 23 being crushed by the external force, and thereby reducing damage to the cell assembly 22.

[0163] In some embodiments, the third end 2321 and the second wall 214 may be located at different heights. That is, the third end 2321 may be closer to the second wall 214 than the second end 2312, or the second end 2312 may be closer to the second wall 214 than the third end 2321.

[0164] In some embodiments, the fixing portion 24 is provided at one end of the housing 21 having an opening 212. This allows the cell assembly 22 and the elastic member 23 to be confined within the housing 21, making the housing 21, cell assembly 22, and elastic member 23 an integrated structure. After the front cover 10 is removed, the front cover 10 can be easily removed and installed independently without affecting the relative positional relationship between the cell assembly 22 and the elastic member 23.

[0165] As shown in Figures 2, 3, 15, and 16, the fixing portion 24 comprises a first fixing portion 241 and a second fixing portion 242, which are spaced apart along the third direction Z. The first fixing portion 241 and the second fixing portion 242 are connected to the third wall 215 and the fourth wall 216, respectively. The second connecting portion 232 abuts against the first fixing portion 241 and the second fixing portion 242.

[0166] The first fixing portion 241 and the second fixing portion 242 are connected to the third wall 215 and the fourth wall 216, respectively, which are positioned opposite each other along the third direction Z, thereby reducing the risk of interference between the first fixing portion 241 and the second fixing portion 242 and other structures. The first fixing portion 241 and the second fixing portion 242 work together to position the elastic member 23, allowing the elastic member 23 to contact the fixing portion 24 and the cell assembly 22 more stably.

[0167] In some embodiments, the fixing portion 24 includes a first fixing portion 241. The first fixing portion 241 is connected to one end of the third wall 215 located at the opening 212 of the housing 21. The first fixing portion 241 and the third wall 215 may be provided separately and connected integrally. The connection between the first fixing portion 241 and the third wall 215 may be a fixed connection, such as a welded connection or an adhesive connection, to improve the stability of the connection between the first fixing portion 241 and the third wall 215. The connection between the first fixing portion 241 and the third wall 215 may be a removable connection, such as a bolted connection, to facilitate maintenance and replacement of the first fixing portion 241. If either the third wall 215 or the first fixing portion 241 is damaged, only the damaged one needs to be replaced, saving costs.

[0168] In other embodiments, the first fixing portion 241 and the third wall 215 may be integrally molded. The first fixing portion 241 may also be a folded structure provided at the end of the third wall 215, which facilitates the manufacturing and molding of the first fixing portion 241.

[0169] In some embodiments, the fixing portion 24 includes a second fixing portion 242. The second fixing portion 242 is connected to one end of the fourth wall 216 located at the opening 212 of the housing 21. The second fixing portion 242 and the fourth wall 216 may be provided separately and connected integrally. The connection between the second fixing portion 242 and the fourth wall 216 may be a fixed connection, such as a welded connection or an adhesive connection, to increase the stability of the connection between the second fixing portion 242 and the fourth wall 216. The connection between the second fixing portion 242 and the fourth wall 216 may be a removable connection, such as a bolted connection, to facilitate maintenance and replacement of the second fixing portion 242. If either the fourth wall 216 or the second fixing portion 242 is damaged, only the damaged one needs to be replaced, saving costs.

[0170] In other embodiments, the second fixing portion 242 and the fourth wall 216 may be integrally molded. The second fixing portion 242 may also be a folded structure provided at the end of the fourth wall 216, which facilitates the manufacturing and molding of the second fixing portion 242.

[0171] In some embodiments, in a third direction Z, the elastic member 23 has an extension 2322 that extends beyond the base 231. The extension 2322 is connected to a second connecting portion 232. The extension 2322 is fixed to the housing 21. Selectively, the extension 2322 extends beyond the base 231 in the direction opposite to the third direction Z. Selectively, the extension 2322 extends beyond the base 231 in the third direction Z.

[0172] In some embodiments, the elastic member 23 comprises two extensions 2322. The two extensions 2322 are connected to both sides of a second connecting portion 232 along a third direction Z. One extension 2322 is fixed to a first fixing portion 241. Selectively, the extension 2322 abuts against the first fixing portion 241. The other extension 2322 is fixed to a second fixing portion 242. Selectively, the extension 2322 abuts against the second fixing portion 242.

[0173] In some embodiments, one of the two extensions 2322 extends beyond one end of the base 231 along the third direction Z, and the other of the two extensions 2322 extends beyond the other end of the base 231 along the direction opposite to the third direction Z.

[0174] When cell 2211 expands, the two extended portions 2322 come into contact with the first fixed portion 241 and the second fixed portion 242, respectively, forming a cantilever structure. This not only prevents the elastic member 23 from detaching from the first fixed portion 241 and the second fixed portion 242, but also allows it to adapt to the expansion of cell 2211.

[0175] Therefore, since each extension portion 2322 is fixed to the first fixing portion 241 and the second fixing portion 242 respectively, when the cell 2211 expands, the second connecting portion 232 can deform away from the cell assembly 22 to adapt to the expansion of the cell 2211, providing space for the deformation of the cell 2211.

[0176] In some embodiments, the fixing portion 24 comprises a third fixing portion 243 and a fourth fixing portion 244, spaced apart along a first direction X. The third fixing portion 243 and the fourth fixing portion 244 are connected to a first wall 213 and a second wall 214, respectively. The second connecting portion 232 abuts against the third fixing portion 243 and the fourth fixing portion 244.

[0177] The third fixing part 243 and the fourth fixing part 244 are connected to the first wall 213 and the second wall 214, respectively, thereby reducing the risk of interference between the third fixing part 243 and the fourth fixing part 244 and other structures. The third fixing part 243 and the fourth fixing part 244 work together to confine the cell assembly 22 and the elastic member 23 within the housing 21, thereby reducing the risk of the cell assembly 22 and the elastic member 23 detaching from the housing 21, and thereby allowing the elastic member 23 to contact the fixing part 24 and the cell assembly 22 more stably.

[0178] In some embodiments, the fixing portion 24 includes a third fixing portion 243. The third fixing portion 243 is connected to one end of the first wall 213 located at the opening 212 of the housing 21. The third fixing portion 243 protrudes into the inner surface of the first wall 213 in a direction toward the second wall 214 from the first wall 213. The third fixing portion 243 and the first wall 213 may be provided separately and connected integrally. The connection between the third fixing portion 243 and the first wall 213 may be a fixed connection, such as a welded connection or an adhesive connection, to increase the stability of the connection between the third fixing portion 243 and the first wall 213. The connection between the third fixing portion 243 and the first wall 213 may be a removable connection, such as a bolted connection, to facilitate maintenance and replacement of the third fixing portion 243. If either the first wall 213 or the third fixing portion 243 is damaged, only the damaged one needs to be replaced, saving costs.

[0179] In other embodiments, the third fixing portion 243 and the first wall 213 may be integrally molded. The third fixing portion 243 may also be a folded structure provided at the end of the first wall 213, which facilitates the manufacturing and molding of the third fixing portion 243.

[0180] The number of third fixing parts 243 may be one or more. In embodiments where there are multiple third fixing parts 243, the multiple third fixing parts 243 are arranged at intervals along the third direction Z. Figures 2, 3, 15, and 16 show the case where there are two third fixing parts 243.

[0181] In some embodiments, the fixing portion 24 includes a fourth fixing portion 244. The fourth fixing portion 244 is connected to one end of the second wall 214 located at the opening 212 of the housing 21. The fourth fixing portion 244 protrudes into the inner surface of the second wall 214 in a direction toward the first wall 213. The fourth fixing portion 244 and the second wall 214 may be provided separately and connected integrally. The connection between the fourth fixing portion 244 and the second wall 214 may be a fixed connection, such as a welded connection or an adhesive connection, to increase the stability of the connection between the fourth fixing portion 244 and the second wall 214. The connection between the fourth fixing portion 244 and the second wall 214 may be a removable connection, such as a bolted connection, to facilitate maintenance and replacement of the fourth fixing portion 244. If either the second wall 214 or the fourth fixing portion 244 is damaged, only the damaged one needs to be replaced, saving costs. In other embodiments, the fourth fixing portion 244 and the second wall 214 may be integrally molded. The fourth fixing portion 244 may also be a folded structure provided at the end of the second wall 214, which facilitates the manufacturing and molding of the fourth fixing portion 244.

[0182] The number of fourth fixing parts 244 may be one or more. In embodiments where there are multiple fourth fixing parts 244, the multiple fourth fixing parts 244 are arranged at intervals along the third direction Z. Figures 2, 3, 15, and 16 show the case where there are two fourth fixing parts 244.

[0183] In some embodiments, the battery module 20 further comprises a first insulating member 25 (shown in Figure 2). The first insulating member 25 is positioned between the first wall 213 and the cell assembly 22 along a first direction X. The first insulating member 25 can serve to insulate between the first wall 213 and the cell assembly 22, preventing friction between the cell assembly 22 and the first wall 213, and extending the service life of the housing 21. The projection of the cell assembly 22 along the first direction X lies within the projection of the first insulating member 25. Thus, even after the cell assembly 22 expands and moves a certain distance within the housing 21, the first insulating member 25 remains positioned between the first wall 213 and the cell assembly 22.

[0184] Embodiments of the present invention further provide a power consumption device comprising a battery module and / or a battery pack described in any one of the above embodiments.

[0185] Since the reliability of the battery module 20 and battery pack 100 described in any one of the above embodiments is good, it is advantageous for improving the reliability of power consumption devices to which power is supplied by this battery module 20 and battery pack 100.

[0186] The foregoing describes only preferred embodiments of the Application and does not limit it. Various modifications and changes are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the Application are included within the scope of protection. [Explanation of Symbols]

[0187] 100 battery packs, 10 Front cover, 10a Input terminal, 10b Output terminal, 20 battery modules, 21 cabinets, 211 containment space, 212 aperture, 213 The first wall, 2131 First position limiting member, 214 The second wall, 2141 Second position limiting member, 215 The third wall, 216 The fourth wall, 217 The fifth wall, 22-cell assembly, 221 cell units, 2211 cells, 2211a First end face, 2211b Second end face, 2211 Cell Case, 22111a Main body, 22111b First sealing part, 22111c Second sealing section, 22112 Electrode Assembly, 22113 Electrode terminal, 2212 holder, 22121 First extension, 22122 Second extension, 22123 Connection part, 222 First conductive member, 223 Second conductive member, 22a First end, 23 Elastic members, 231 base, 2311 Reinforcement rib, 2312 Second end, 232 Second connection section, 2321 Third end, 2322 Extension, 233 buffer section, 233a First bending means, 2331 First segment, 2332 Second segment, 24 fixed part, 241 First fixing part, 242 Second fixing part, 243 Third fixing part, 244 The fourth fixing part, 25 First insulating member, 30 circuit boards, X First direction, Y Second direction, Z, the third direction, Q1 Gap, Q2 Cushioning material.

Claims

1. It is a battery module, A housing having a first wall and a second wall arranged opposite to each other along a first direction, A cell assembly housed in the aforementioned housing and supported by the first wall, The assembly comprises elastic members arranged together with the cell assembly along a second direction perpendicular to the first direction, Along the first direction, a gap exists between the elastic member and the second wall, and the elastic member extends beyond the cell assembly. The cell assembly comprises a plurality of cell units, the plurality of cell units stacked along a second direction, each cell unit comprises a cell and a holder, the holder comprises a first extension, the first extension covers a portion of the cell, At least one of the first extensions is located between the cell and the second wall along the first direction, The elastic member extends beyond the first extension along the first direction, The holder comprises a second extension, the second extension covering a portion of the cell, Along the first direction, at least one of the second extensions is located between the cell and the first wall, A battery module characterized by the following features.

2. The cell comprises a cell case, an electrode assembly, and electrode terminals, the cell case comprises a main body and a first sealing portion, the electrode assembly is provided on the main body, and the electrode terminals protrude out of the cell case from the first sealing portion. The first extension covers a portion of the first sealing portion, and / or The second extension covers a part of the first sealing portion. The battery module according to claim 1, characterized in that

3. The cell case comprises two second sealing portions arranged opposite to each other along the first direction, and the two second sealing portions are located on both sides of the main body along the first direction. The first extension covers a portion of one of the second sealing portions and a portion of the main body, and / or The second extension covers a part of another second sealing part and a part of the main body. The battery module according to claim 2, characterized in that

4. The holder includes a connecting portion, the connecting portion connecting the first extension and the second extension. A battery module according to any one of claims 1 to 3, characterized in that

5. The holder is integrally molded with the cell. A battery module according to any one of claims 1 to 3, characterized in that

6. The elastic member comprises a base, a second connecting portion, and at least one buffer portion, the base being connected to the cell assembly, and the buffer portion connecting the base and the second connecting portion. Along the first direction, the second connection extends beyond the cell assembly, and / or the buffer extends beyond the cell assembly. A battery module according to any one of claims 1 to 3, characterized in that

7. The buffer portion comprises at least one first bending means, the first bending means comprising a first segment and a second segment connected to each other, the angle between the first segment and the second segment being B, where 0° < B < 90°. The battery module according to claim 6, characterized in that

8. The elastic member is housed in the housing, and the second connecting portion is fixed to the housing. The battery module according to claim 6, characterized in that

9. The elastic member has two extensions extending beyond both ends of the base in a third direction, the two extensions being fixed to the housing, and the first, second, and third directions being perpendicular to each other. The battery module according to claim 8, characterized in that

10. It is a battery pack, A battery module according to any one of claims 1 to 3, The housing comprises a front cover connected to the housing, A battery pack characterized by the following features.

11. A power consumption device, A battery pack comprising at least one of the claims 10, A power consumption device characterized by the following features.

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