Battery module, battery pack, and electric equipment

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 in particular to battery modules, battery packs and power consuming devices. [Background technology]

[0002] Batteries are widely used in the fields of portable electronic devices, electric vehicles, power tools, drones, energy storage devices, etc. As the application environments and conditions become more and more complex, the requirements for battery reliability become higher. Summary of the Invention

[0003] SUMMARY OF THE DISCLOSURE The embodiments of the present application provide a battery module, a battery pack and a power consuming device to enhance the reliability of the battery.

[0004] An embodiment of the present application provides a battery module including a housing, a cell assembly, and an elastic member. The housing has a first wall and a second wall arranged opposite each other along a first direction. The cell assembly is housed in the housing and supported by the first wall. The elastic member is arranged along the second direction together with the cell assembly. Along the first direction, a gap exists between the elastic member and the second wall, and the elastic member exceeds the cell assembly.

[0005] In the above technical solution, 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, which facilitates assembly of the elastic member into the housing and reduces the risk of interference between the elastic member and the wall of the housing. The elastic member exceeds the cell assembly along the first direction, so that when the battery module is subjected to an external force such as pressure or impact, the elastic member can receive the external pressure or impact before the cell assembly, which reduces damage to the cell assembly caused by the external force and improves the reliability of the battery module.

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

[0007] In the above technical solution, the first extension covers a part of the cell, thereby protecting the cell and 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, so that when the battery module receives an external force such as pressure or impact, the elastic member can receive the external force before the first extension, thereby reducing damage to the cell caused by the external force and thereby improving the reliability of the battery module.

[0008] In one or more of the alternative embodiments described above, the holder includes a second extension that covers a portion of the cell, and at least one second extension is located between the cell and the first wall along the first direction.

[0009] In the above technical solution, the second extension can cover a part of the cell, thereby playing a role in protecting the cell and reducing the risk of damage to the cell. At least one second extension is located between the cell and the first wall, so that the cell and the first wall are in indirect contact with each other via the second extension, and the risk of wear caused by direct contact between the cell and the first wall can be avoided.

[0010] In one or more of the alternative embodiments above, the cell includes a cell casing, an electrode assembly, and an electrode terminal. The cell casing includes a body portion and a first sealing portion. The electrode assembly is provided in the body portion. The electrode terminal protrudes from the first sealing portion to the outside of the cell casing. The first extension portion covers a portion of the first sealing portion, and / or the second extension portion covers a portion of the first sealing portion.

[0011] In the above technical solution, the first extension portion covers a portion of the first sealing portion, and / or the second extension portion covers a portion of the first sealing portion, thereby playing a role in protecting the first sealing portion, and improving the sealing performance of the cell, thereby improving the reliability of the cell.

[0012] In one or more of the above optional embodiments, the cell casing includes two second sealing portions arranged opposite each other along the first direction. The two second sealing portions are located on both sides of the body portion along the first direction. The first extension portion covers a portion of one second sealing portion and a portion of the body portion, and / or the second extension portion covers a portion of another second sealing portion and a portion of the body portion.

[0013] In the above technical proposal, the cell case has two second sealing parts arranged opposite to each other along the first direction, which not only facilitates assembly and molding of the cell but also is advantageous in improving the sealing performance of the cell. The first extension part covers a part of one second sealing part and a part of the main body part, thereby playing a role in protecting the second sealing part and the main body part, and can reduce the risk of damage to the cell due to external forces such as pressure and impact. The second extension part covers a part of another second sealing part and a part of the main body part, thereby playing a role in protecting the second sealing part and the main body part, and can reduce the risk of damage to the cell due to external forces such as pressure and impact.

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

[0015] In the above technical proposal, the connection portion connects the first extension portion and the second extension portion, which not only makes the first extension portion, the second extension portion, and the connection portion into an integrated structure, but also has the advantage of increasing the stability of the fit between the holder and the cell.

[0016] In one or more of the alternative embodiments described above, the holder is integrally molded to the cell.

[0017] In the above technical solution, the holder is integrally molded with the cell, which not only facilitates the connection between the holder and the cell, but also has the advantage that the holder has relatively good structural strength and has a relatively stable connection relationship between the cell and the holder.

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

[0019] In the above technical solution, along the first direction, the second connection part exceeds the cell assembly and / or the buffer part exceeds the cell assembly, so that when the battery module is subjected to an external force such as pressure or impact, the second connection part and / or the buffer part can receive the external pressure or impact before the cell assembly, thereby reducing damage to the cell assembly caused by the external force and improving the reliability of the battery module.

[0020] In one or more of the alternative embodiments described above, the buffer portion includes at least one first folding means provided between the base portion and the second connecting portion. The first folding means includes a first segment and a second segment that are interconnected. An angle B between the first segment and the second segment is 0°. <B<90°である。

[0021] In the above technical solution, the first segment and the second segment in the buffer section are connected and arranged at an angle, so that the buffer section can be easily deformed and the force caused by the expansion of the cells can be absorbed.

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

[0023] In the above technical solution, the elastic member is accommodated in the housing, making the structure of the battery module more compact. The second connection part is fixed to the housing, which increases the stability of the elastic member within the housing and reduces the risk of movement.

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

[0025] In the above technical solution, since the extension portion is fixed to the housing, when the cell expands, the second connection portion can deform in a direction away from the cell assembly to accommodate the expansion of the cell, thereby providing space for the deformation of the cell.

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

[0027] In the above technical solution, the fixing portion is provided on the side of the elastic member away from the cell assembly, which can reduce the risk of the cell assembly and the elastic member separating, and can also reduce the risk of the elastic member and the cell assembly detaching from the housing, which is advantageous for forming the housing, cell assembly and elastic member as a single unit, and makes the structures of the housing, cell assembly and elastic member more compact.

[0028] In one or more of the above optional embodiments, the housing has an opening at one end along the second direction, and the fixing portion is provided at the end of the housing having the opening.

[0029] In the above technical solution, the fixing part is provided at one end of the housing having an opening, so that the cell assembly and the elastic member can be confined within the housing, and the housing, the cell assembly and the elastic member are integrated into one structure, which facilitates independent removal and installation of the front cover after the front cover is removed without affecting the relative positional relationship between the cell assembly and the elastic member.

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

[0031] In the above technical solution, the first fixing part and the second fixing part are respectively connected to the third wall and the fourth wall arranged opposite to each other along the third direction, thereby reducing the risk of the first fixing part and the second fixing part interfering with other structures. The first fixing part and the second fixing part cooperate to restrict the position of the elastic member, so that the elastic member can be more stably abutted between the fixing part and the cell assembly.

[0032] In one or more of the above optional embodiments, the fixing portion includes a third fixing portion and a fourth fixing portion spaced apart along the first direction. The third fixing portion and the fourth fixing portion are connected to the first wall and the second wall, respectively. The second connecting portion abuts the third fixing portion and the fourth fixing portion.

[0033] In the above technical solution, the third fixing part and the fourth fixing part are connected to the first wall and the second wall, respectively, thereby reducing the risk of the third fixing part and the fourth fixing part interfering with other structures. The third fixing part and the fourth fixing part cooperate to restrict the cell assembly and the elastic member within the housing, thereby reducing the risk of the cell assembly and the elastic member coming off the housing, so that the elastic member can be more stably abutted between the fixing part and the cell assembly.

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

[0035] In the above technical solution, the number of the buffer parts and the second connecting parts may be plural, which makes it easier to absorb the acting force caused by the expansion and deformation of the cell.

[0036] In one or more of the above optional embodiments, the elastic member includes two buffer parts and two second connecting parts. The two buffer parts are spaced apart along the first direction. The two second connecting parts are spaced apart along the first direction. The two buffer parts are respectively connected to both ends of the base along the first direction.

[0037] In the above technical solution, the number of the buffer parts and the second connecting parts are both two, and the two buffer parts are arranged at an interval along the first direction, thereby making rational use of the assembly space.

[0038] In one or more of the alternative embodiments described above, the base is provided with reinforcing ribs.

[0039] In the above technical solution, a reinforcing rib is provided on the base so that the base has high strength and is less susceptible to damage.

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

[0041] In the above technical proposal, the base, the buffer part and the second connecting part are formed by bending and shaping a plate material, which simplifies the structure, facilitates processing and manufacturing, and also makes the connection between the base and the buffer part strong, as well as the connection between the buffer part and the second connecting part strong.

[0042] In one or more optional embodiments above, the cell is a soft-pack cell.

[0043] In one or more of the above optional embodiments, an embodiment of the present application provides a battery pack, the battery pack including a front cover connected to a housing, and the battery module according to any one of the above embodiments.

[0044] In the above technical solution, the front cover is connected to the housing, which not only plays a role in protecting the structure inside the housing, but also is advantageous in improving the sealing performance of the battery pack, thereby improving the reliability of the battery pack.

[0045] An embodiment of the present application further provides a power consuming device, comprising at least one battery pack according to any one of the above embodiments.

[0046] In the above technical solution, the reliability of the battery module and battery pack described in any one of the above embodiments is good, which is advantageous for improving the reliability of the power consuming device supplied with power by the battery module and battery pack. [Brief description of the drawings]

[0047] In order to more clearly describe the technical solutions of the embodiments of the present application, the drawings necessary for the embodiments will be briefly described below, and it should be understood that the drawings only show some embodiments of the present application. [Figure 1]FIG. 1 is a schematic diagram of a battery pack according to some embodiments of the present application. [Diagram 2] FIG. 2 is an exploded view of a battery pack according to some embodiments of the present application. [Diagram 3] FIG. 3 is an exploded view of a housing according to some embodiments of the present application. [Figure 4] FIG. 4 is a structural schematic diagram of a second wall according to some embodiments of the present application. [Diagram 5] FIG. 5 is a structural schematic diagram of a portion of a battery module according to some embodiments of the present application. [Figure 6] FIG. 6 is a structural schematic diagram of a cell according to some embodiments of the present application. [Figure 7] FIG. 7 is an exploded view of a cell according to some embodiments of the present application. [Figure 8] FIG. 8 is a cross-sectional view of a battery pack according to some embodiments of the present application. [Figure 9] FIG. 9 is an enlarged view of A1 in FIG. [Figure 10] FIG. 10 is a structural schematic diagram of a cell unit according to some embodiments of the present application. [Figure 11] FIG. 11 is an enlarged view of A2 in FIG. [Figure 12] FIG. 12 is a structural schematic diagram of a cell unit from another perspective according to some embodiments of the present application. [Figure 13] FIG. 13 is an enlarged view of A3 in FIG. [Figure 14] FIG. 14 is a structural schematic diagram of a cell assembly according to some embodiments of the present application. [Figure 15] FIG. 15 is a schematic diagram of fitting between a part of a housing and an elastic member. [Figure 16] FIG. 16 is a schematic diagram showing the structure of a portion of a battery module according to another embodiment of the present application. [Figure 17] FIG. 17 is a structural schematic diagram of an elastic member according to some embodiments of the present application. [Figure 18]FIG. 18 is a structural schematic diagram of an elastic member from another viewpoint according to some embodiments of the present application. [Figure 19] FIG. 19 is a view of an elastic member according to some embodiments of the present application viewed in a second direction. [Figure 20] FIG. 20 is a view of an elastic member according to some embodiments of the present application, viewed in a direction opposite to the second direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. It is clear that the described embodiments are merely some of the embodiments of the present invention, rather than all the embodiments. In general, the components of the embodiments of the present application shown in the drawings can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present application in the drawings is not intended to limit the scope of protection of the present application, but merely illustrates selected embodiments of the present application, and the features of the embodiments and the features of the embodiments in the present application can be combined with each other unless they are inconsistent.

[0050] It should be noted that like numerals and letters represent like items in the following figures, so that once an item is defined in one figure, it does not require further definition and explanation in the next figure.

[0051] In the description of the embodiments of the present application, the directions and positional relationships shown are based on the directions and positional relationships shown in the drawings, or the directions and positional relationships in which the products of the present application are usually arranged when used, or the directions and positional relationships that can be generally understood by those skilled in the art. This is merely for the purpose of facilitating and simplifying the description of the present application, and does not expressly or imply that the devices or elements mentioned necessarily have a specific direction, or are constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, terms such as "first", "second", and "third" are used only to distinguish the description, and cannot be understood as expressing or implying relative importance.

[0052] At present, with the development of the market situation, the application of battery modules is becoming more and more widespread. Battery modules are widely used in many fields, such as electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as electric tools, drones, energy storage devices, etc. With the gradual expansion of the application fields of battery modules, the market demand for them is also continuing to expand.

[0053] The development of battery module technology requires simultaneous consideration of multiple design factors, such as performance parameters such as energy density, cycle life, discharge capacity, charge / discharge rate, etc. In addition, the reliability of the battery module is also an important consideration as the environmental conditions and / or the internal conditions of the battery module change.

[0054] As the usage environment of the battery module becomes more and more complicated, the battery module may be subjected to external forces such as pressure, impact, etc. If these external forces are transmitted to the cells inside the battery module through the housing, the cells may be damaged, resulting in a decrease in the reliability of the battery module.

[0055] Based on the above consideration, in order to solve the problem that the reliability of the battery module is reduced by an external acting force, an embodiment of the present application provides a battery module. The battery module includes a housing, a cell assembly, and an elastic member. The housing has a first wall and a second wall arranged opposite each other along a first direction. The cell assembly is accommodated in the housing and supported by the first wall. The elastic member is provided in the housing and is arranged along the second direction together with the cell assembly. Along the first direction, a gap exists between the elastic member and the second wall, and the elastic member exceeds the cell assembly.

[0056] The first wall of the housing supports the cell assemblies, and the presence of a gap between the elastic member and the second wall along the first direction facilitates assembly of the elastic member into the housing and reduces the risk of interference between the elastic member and the wall of the housing. The elastic member exceeds the cell assemblies along the first direction, so that when the battery module is subjected to an external force such as pressure or impact, the elastic member can receive the external pressure or impact before the cell assemblies, thereby reducing damage to the cell assemblies due to the external force and improving the reliability of the battery module.

[0057] An embodiment of the present application provides a power consuming device that uses a battery pack or a battery module as a power source. The power consuming 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, the electronic device may include a mobile phone, a tablet, a laptop, etc. The power tool may include an electric drill, an electric saw, etc. The electric vehicle may include an electric car, an electric motorcycle, an electric bicycle, etc.

[0058] For ease of explanation, some electrode terminals are not shown in the bent state in the drawings.

[0059] As shown in FIGS. 1 and 2, an embodiment of the present application provides a battery pack 100 including a front cover 10 and a battery module 20. As shown in FIG.

[0060] The battery module 20 includes a housing 21 and a cell assembly 22. The cell assembly 22 is provided in the housing 21. The housing 21 has a first wall 213 and a second wall 214 arranged opposite each other along a first direction X. The first wall 213 supports the cell assembly 22.

[0061] An accommodation space 211 is formed in the housing 21. The cell assembly 22 is accommodated in the accommodation space 211.

[0062] In some embodiments, the housing 21 may be an integrally molded structure. An opening 212 is formed at one end of the accommodation 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 serves to protect 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 is connected to the housing 21 to cover the opening 212. The front cover 10 and the housing 21 may be connected in a removable manner, such as a bolt connection or a snap connection, to facilitate 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 in a fixed manner, such as a welding 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 another embodiment, the housing 21 may be formed by connecting several members independent of each other 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 common positive electrode and common negative electrode of the cell assembly 22, respectively. The input terminal 10a and the output terminal 10b are for electrically connecting to an external device so as to charge the battery pack 100 and to discharge the electric energy of the battery pack 100.

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

[0067] 2 and 3, the housing 21 includes a plurality of walls that together define the housing space 211. The plurality of walls may be integrally molded to form the housing 21. The housing 21 may be formed using an integral molding method such as casting, injection molding, or press processing.

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

[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 each wall may include, but is not limited to, a welding connection, an adhesive connection, and the like.

[0070] 2 and 3, the housing 21 includes 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 disposed opposite each other along a first direction X. The third wall 215 and the fourth wall 216 are disposed opposite each other along a third direction Z. The opening 212 and the fifth wall 217 are disposed 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 receives the gravity of the cell assembly 22 to support the cell assembly 22. The third wall 215 and the fourth wall 216 are respectively connected to both ends of the first wall 213 along the third direction Z. The first wall 213, the third wall 215 and the fourth wall 216 may be integrally formed.

[0072] The second wall 214 is connected to an end of the third wall 215 opposite the first wall 213 and to an end of the fourth wall 216 opposite the first wall 213. The second wall 214 and the third wall 215 may be releasably connected to facilitate maintenance and replacement of the second wall 214 and the third wall 215. The releasable connection may be a bolted connection, a snap connection, or the like.

[0073] The second wall 214 and the third wall 215 may be fixedly connected to facilitate manufacturing and forming 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 releasably connected to facilitate maintenance and replacement of the second wall 214 and the fourth wall 216. The releasable 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 manufacturing and forming 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 a fifth wall 217. The fifth wall 217 and the opening 212 are disposed 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 fixedly connected, such as, for example, a welded or adhesive connection.

[0078] The first wall 213, the second wall 214, the third wall 215, the fourth wall 216, and the fifth wall 217 may be releasably connected to facilitate maintenance and replacement of portions of the housing 21. The releasable connections may be bolted 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 manufacturing and molding of the housing 21, thereby providing the housing 21 with better structural strength.

[0080] As shown in FIGS. 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 arranged along the third direction Z at an interval.

[0081] The first position limiting members 2131 protrude 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 limit the movement of the cell assembly 22 along the third direction Z and the direction opposite to the third direction Z. This can increase the stability of the cell assembly 22 within the housing 21.

[0082] The first position limiting member 2131 may be formed by pressing from the outer surface of the first wall 213. In the pressing process, a recess is formed in 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 facing 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 facing away from the cell assembly 22 along the direction opposite to the first direction X.

[0084] 4, two second position limiting members 2141 are provided on the second wall 214. The two second position limiting members 2141 are arranged along the third direction Z at an interval.

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

[0086] The second position limiting member 2141 can be formed by pressing from the outer surface of the second wall 214. In the pressing process, a recess is formed in the outer surface of the second wall 214, and the second position limiting member 2141 protruding from the inner surface of the second wall 214 is formed.

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

[0088] 5 and 6, the cell assembly 22 includes a plurality of cell units 221, which are stacked along the second direction Y. The term "plural" refers to a number of two or more. Each cell unit 221 includes a cell 2211. The cell 2211 may be a hard shell cell or a soft pack cell.

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

[0090] In some embodiments, the cell casing 22111 includes a main body portion 22111a and a first sealing portion 22111b, and the first sealing portion 22111b is connected to a first end surface 2211a of the main body portion 22111a along the third direction Z. The electrode assembly 22112 is housed in the main body portion 22111a. The electrode terminal 22113 is connected to the electrode assembly 22112 and protrudes from the first sealing portion 22111b to the outside of the cell casing 22111.

[0091] The cell 2211 has two electrode terminals 22113, both of which are connected to the electrode assembly 22112, and the polarities of the two electrode terminals 22113 are opposite to each other, that is, one electrode terminal 22113 is a positive terminal and the other electrode terminal 22113 is a negative terminal.

[0092] In some embodiments, the two electrode terminals 22113 may be located at the same end of the cell 2211 along the third direction Z. The two electrode terminals 22113 extend outside the cell casing 22111 from the same first sealing portion 22111b, which facilitates rational arrangement of the cell assembly 22 within the housing 21, enables full utilization of the internal space of the housing 21, and also facilitates electrical connection between other structures and the two electrode terminals 22113. In this case, the cell casing 22111 may include one first sealing portion 22111b.

[0093] As shown in FIGS. 5 to 7, in another embodiment, the two electrode terminals 22113 may be located at both opposing ends of the cell 2211. The cell case 22111 includes two first sealing portions 22111b. The two first sealing portions 22111b are located on both sides of the main body portion 22111a along the third direction Z. One first sealing portion 22111b is connected to the first end surface 2211a of the main body portion 22111a, and the other first sealing portion 22111b is connected to the second end surface 2211b of the main body portion 22111a. The first end surface 2211a and the second end surface 2211b are disposed opposite to each other along the third direction Z. By the two electrode terminals 22113 being located at both opposing ends of the cell 2211, the risk of a short circuit of the cell assembly 22 can be reduced.

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

[0095] The multiple cells 2211 may be connected in series or in parallel, or some of the multiple cells 2211 may be connected in series and other cells 2211 may be connected in parallel.

[0096] 5, the cell assembly 22 further includes 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 to form a 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 to form a 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] 2, 8 and 9, the battery module 20 further includes an elastic member 23. The elastic member 23 is arranged along the second direction Y together with the cell assembly 22. 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 exceeds 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, which facilitates assembly of the elastic member 23 into the housing 21 and reduces the risk of interference between the elastic member 23 and the wall of the housing 21. As the elastic member 23 extends beyond the cell assembly 22 along the first direction X, when the battery module 20 receives an external force such as a pressure or impact, the elastic member 23 can receive the external pressure or impact before the cell assembly 22, thereby reducing damage to the cell assembly 22 due to the external force and improving the reliability of the battery module 20.

[0099] In some embodiments, the elastic member 23 is configured to provide an expansion space for the cell assembly 22. The elastic member 23 is compressible or extensible in the second direction Y. When the cell 2211 expands, the cell assembly 22 presses the elastic member 23, and the elastic member 23 is compressed along the second direction Y, thereby absorbing the expansion amount of the cell 2211 and providing a space for the expansion of the cell 2211. The elastic member 23 can also maintain each cell unit 221 in an abutting state, which makes the structure of the cell assembly 22 more compact and reduces the risk of the cell unit 221 moving loosely 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 can always receive the external force before the cell assembly 22, which can reduce damage to the cell assembly 22 and thereby improve the reliability of the battery module 20.

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

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

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

[0104] In some embodiments, the holders 2212 of two adjacent cell units 221 may abut along the second direction Y. By abutting the holders 2212 of the two adjacent cell units 221, the problem of damage caused by contact friction between the adjacent cells 2211 can be alleviated, the reliability of the cells 2211 can be improved, and the service life of the cells 2211 can be extended.

[0105] Of course, in other embodiments, the main bodies 22111a of the cell casings 22111 of two adjacent cell units 221 may be in contact with each other.

[0106] The holder 2212 is closer to the second wall 214 than the cell 2211 along the first direction X. One end of the holder 2212 facing the second wall 214 is a first end 22a. The elastic member 23 extends beyond the one end of the holder 2212 facing the second wall 214, so that when the battery module 20 receives an external force such as a pressure or an impact, the elastic member 23 can receive the external force before the holder 2212, thereby reducing damage to the cell 2211 due to the external force and thereby improving 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 the first direction X. Along the first direction X, the elastic member 23 extends beyond the first extension 22121.

[0109] An end of the first extension portion 22121 facing the second wall 214 along the first direction X is a first end portion 22a of the cell assembly 22. When the battery module 20 is subjected to an external force such as pressure or impact, the elastic member 23 can receive the external pressure or impact before the holder 2212, thereby reducing damage to the cells 2211 caused by the external force and improving the reliability of the battery module 20.

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

[0111] In some embodiments, the first extension portion 22121 covers a portion of the first sealing portion 22111b, thereby serving to protect the first sealing portion 22111b and reducing the risk of damage to the cell 2211 due to external forces such as pressure or impact.

[0112] In some embodiments, the first extension portion 22121 covers a portion of one second sealing portion 22111c and a portion of the main body portion 22111a, thereby serving to protect the second sealing portion 22111c and the main body portion 2111a, and reducing the risk of damage to the cell 2211 due to external forces such as pressure or impact.

[0113] The number of the first extending portions 22121 may be one or more. As shown in FIG. 10 and FIG. 11, the number of the first extending portions 22121 is two. The two first extending portions 22121 are arranged at an interval along the third direction Z, and each of the first extending portions 22121 covers a part of the first sealing portion 22111b, a part of the main body portion 22111a, and a part of the second sealing portion 22111c. This can serve to better protect the cell 2211, and can also reduce the weight of the cell unit 221.

[0114] 12 and 13, the holder 2212 includes a second extension 22122. The second extension 22122 covers a portion of the cell 2211.

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

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

[0117] In some embodiments, the cells 2211 are connected in series, and the first extensions 22121 and the second extensions 22122 are arranged alternately in sequence along the second direction Y (as shown in FIG. 14).

[0118] In some embodiments, the second extension portion 22122 covers a portion of the first sealing portion 22111b, thereby serving to protect the first sealing portion 22111b and reducing the risk of damage to the cell 2211 due to external forces such as pressure or impact.

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

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

[0121] The number of the second extending portions 22122 may be one or more. As shown in FIG. 10, FIG. 11, FIG. 12, and FIG. 13, the number of the second extending portions 22122 is two. The two second extending portions 22122 are arranged at an interval along the third direction Z. Each of the second extending portions 22122 covers a part of the first sealing portion 22111b, a part of the main body portion 22111a, and a part of the second sealing portion 22111c. This can serve to better protect the cell 2211, and can also reduce the weight of the cell unit 221.

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

[0123] In an embodiment in which the number of each of the first extension portion 22121 and the second extension portion 22122 is two, there may be two connection portions 22123. One connection portion 22123 connects one first extension portion 22121 to one second extension portion 22122, and the other connection portion 22123 connects the other first extension portion 22121 to the other second extension portion 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 connection portion 22123 covers at least a portion of the first end surface 2211a, thereby limiting deformation of the main body portion 22111a, reducing the risk of bulging deformation at the first end surface 2211a, and improving the reliability of the battery module 20.

[0126] In some embodiments, the connecting portion 22123 may advantageously cover a portion of the first sealing portion 22111b, thereby providing added protection to the first sealing portion 22111b.

[0127] There are various methods for providing the holder 2212 to the cell 2211. For example, the holder 2212 may be adhered to the cell 2211, or the holder 2212 may 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 favors that the holder 2212 has good structural strength and has a stable connection relationship between the cell 2211 and the holder 2212. Here, integral molding means that the holder 2212 and the cell 2211 are directly fixed together. The method of integral molding includes, but is not limited to, an injection process and an injection molding process.

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

[0130] In some embodiments, the insulating material includes, but is not limited to, sealants, foaming gums.

[0131] In some embodiments, the injection molding process includes: putting the cell 2211 into a mold, an injection molding machine heats and melts the insulating material, the molten insulating material flows into the mold, the insulating material hardens to form the holder 2212, and after it is bonded and fixed with the cell 2211, the holder 2212 and the cell 2211 are removed from the mold. Optionally, the insulating material includes polyamide.

[0132] In some embodiments, the holder 2212 is an insulating holder, which can reduce the risk of short circuiting 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 the second direction Y. The fixing portion 24 is provided on the side of the elastic member 23 away from the cell assembly 22, which can reduce the risk of the cell assembly 22 and the elastic member 23 being separated, can also reduce the risk of the elastic member 23 and the cell assembly 22 being detached from the housing 21, is advantageous in forming the housing 21, the cell assembly 22 and the elastic member 23 integrally, and makes the structures of the housing 21, the cell assembly 22 and the elastic member 23 more compact.

[0134] One end of the elastic member 23 abuts against the cell assembly 22 along the second direction Y. The elastic member 23 and the cell assembly 22 may be in direct abutment, i.e., the elastic member 23 and the cell assembly 22 are in direct contact with each other. The elastic member 23 and the cell assembly 22 may be in indirect abutment with each other. 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 abutment with each other via the buffer member Q2. The buffer member Q2 may be a foam.

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

[0136] As shown in Figures 17 to 20, in some embodiments, the elastic member 23 includes a base 231, a second connecting portion 232, and at least one buffer portion 233, where the base 231 is connected to the cell assembly 22, and the buffer portion 233 connects the base 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. Optionally, the base 231 is in contact with and connected to the cell unit 221. Optionally, 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 body portion 22111a lies along the first direction X into the base portion 231, which is advantageous for the base portion 231 to apply pressure to the body portion 22111a.

[0140] The second connecting portion 232 may be connected to the fixed portion 24. Optionally, the second connecting portion 232 is in contact with and connected to the fixed portion 24. Optionally, the second connecting portion 232 and the fixed portion 24 may be used to connect to another component.

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

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

[0143] The buffer part 233 may have various structures. For example, the buffer part 233 may have a semicircular arc structure, an S-shaped structure, or a Z-shaped structure. As shown in Figs. 17 to 20, in some embodiments, the buffer part 233 has a bent structure provided between the base part 231 and the second connecting part 232. This simplifies the structure, facilitates processing and manufacturing, and can well adapt to changes in the distance between the base part 231 and the second connecting part 232.

[0144] 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 provided 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 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 portion 231 and the second connection portion 232, and thereby enabling better adaptation to the expansion of the cell 2211.

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

[0149] FIG. 18 shows a 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 portion 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 portion 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 portion 231, and the second connection portion 232 including one first bending means 233a form an M-shaped elastic member 23.

[0150] As the cell 2211 expands, the distance along the second direction Y between the base 231 and the second connecting portion 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 connecting portion 232 and the second segment 2332 decreases.

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

[0152] 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 and the second connecting section 232. By connecting the multiple buffer sections 233 between the base section 231 and the second connecting section 232, it is possible to well adapt to changes in the distance between the base section 231 and the second connecting section 232.

[0153] As shown in Figs. 17 to 20, in an embodiment in which the elastic member 23 includes a plurality of buffer parts 233, the elastic member 23 further includes a plurality of second connecting parts 232. One second connecting part 232 is provided corresponding to each buffer part 233. Each second connecting part 232 is connected to the base part 231 via one buffer part 233. There may be a plurality of buffer parts 233 and second connecting parts 232. This is advantageous in absorbing the acting force due to the expansion and deformation of the cells 2211.

[0154] Exemplarily, as shown in Figs. 17 to 20, the elastic member 23 includes two buffer parts 233 and two second connecting parts 232. The two buffer parts 233 are arranged at an interval along the first direction X. The two second connecting parts 232 are arranged at an interval along the first direction X. The two buffer parts 233 are connected to both ends of the base part 231 along the first direction X, respectively. The number of buffer parts 233 and the number of second connecting parts 232 are both two, and the two buffer parts 233 are arranged at an interval along the first direction X, thereby making it possible to rationally utilize the assembly space.

[0155] As shown in FIGS. 17 to 20, in some embodiments, the base 231 is provided with reinforcing ribs 2311 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 stripe structure extending along the first direction X. The number of reinforcing ribs 2311 may be one or more. In an embodiment in which the number of reinforcing ribs 2311 is more than one, the reinforcing ribs 2311 are arranged at intervals along the third direction Z. FIGS. 17, 19, and 20 show a case in which the number of reinforcing ribs 2311 is four.

[0157] There are various methods for forming the elastic member 23. For example, the base 231, the second connecting portion 232, and the buffer portion 233 are independent parts and are integrally connected by a detachable connection or a fixed connection to form the elastic member 23. In other embodiments, the elastic member 23 may be integrally formed. For example, the base 231, the buffer portion 233, and the second connecting portion 232 are formed by bending a plate material. This simplifies the structure, facilitates processing and manufacturing, and provides a strong connection between the base 231 and the buffer portion 233, as well as a strong connection between the buffer 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 connection portion 232 is fixed to the housing 21.

[0159] In some embodiments, fastening includes, but is not limited to, abutting, gluing, welding, locking with fasteners, snap connections, and the like.

[0160] In some embodiments, the elastic member 23 is fixed by the housing 21. After the front cover 10 is removed, the elastic member 23 remains fixed 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 the 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 ends of the elastic member 23 closest to the second wall 214 (see FIG. 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 cooperate to resist the external force, thereby allowing the elastic member 23 to withstand a larger external pressing force or impact force, reducing the risk of the elastic member 23 being crushed by the external force, and thereby reducing damage to the cell assemblies 22.

[0163] In some embodiments, the third end 2321 and the second wall 214 may be located at different heights, i.e., the third end 2321 is closer to the second wall 214 than the second end 2312, or the second end 2312 is 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 the opening 212. This allows the cell assembly 22 and the elastic member 23 to be confined within the housing 21, and the housing 21, the cell assembly 22 and the elastic member 23 form an integral structure. After the front cover 10 is removed, it becomes easy to remove and attach the front cover 10 independently without affecting the relative positional relationship between the cell assembly 22 and the elastic member 23.

[0165] 2, 3, 15 and 16, the fixing portion 24 includes a first fixing portion 241 and a second fixing portion 242 spaced apart from each other 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 disposed 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 cooperate to limit the position of the elastic member 23, thereby allowing the elastic member 23 to abut between 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 together. The first fixing portion 241 and the third wall 215 may be fixedly connected, for example, by welding or adhesive connection, to increase the connection stability between the first fixing portion 241 and the third wall 215. The first fixing portion 241 and the third wall 215 may be detachably connected, for example, by bolt connection, to facilitate the 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, which saves costs.

[0168] In another embodiment, the first fixing portion 241 and the third wall 215 may be integrally molded. The first fixing portion 241 may be a folded structure provided at an end of the third wall 215, which makes it easier to manufacture and mold 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 together. The second fixing portion 242 and the fourth wall 216 may be fixedly connected, for example, by welding or adhesive connection, to enhance the connection stability between the second fixing portion 242 and the fourth wall 216. The second fixing portion 242 and the fourth wall 216 may be detachably connected, for example, by bolt connection, to facilitate the 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, which saves costs.

[0170] In another embodiment, the second fixing portion 242 and the fourth wall 216 may be integrally molded. The second fixing portion 242 may be a folded structure provided at an end of the fourth wall 216, which makes it easier to manufacture and mold the second fixing portion 242.

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

[0172] In some embodiments, the elastic member 23 includes two extending portions 2322. The two extending portions 2322 are connected to both sides of the second connecting portion 232, respectively, along the third direction Z. One extending portion 2322 is fixed to the first fixing portion 241. Optionally, the extending portion 2322 abuts against the first fixing portion 241. The other extending portion 2322 is fixed to the second fixing portion 242. Optionally, the extending portion 2322 abuts against the second fixing portion 242.

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

[0174] When the cell 2211 expands, the two extension parts 2322 come into contact with the first fixing part 241 and the second fixing part 242, respectively, which corresponds to forming a cantilever structure. This not only prevents the elastic member 23 from coming off the first fixing part 241 and the second fixing part 242, but also allows the elastic member 23 to adapt to the expansion of the cell 2211.

[0175] Therefore, each extension portion 2322 is fixed to the first fixing portion 241 and the second fixing portion 242, respectively, so that when the cell 2211 expands, the second connection portion 232 can deform in a direction away from the cell assembly 22 to accommodate the expansion of the cell 2211, and provide space for the deformation of the cell 2211.

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

[0177] The third fixing portion 243 and the fourth fixing portion 244 are connected to the first wall 213 and the second wall 214, respectively, thereby reducing the risk of interference between the third fixing portion 243 and the fourth fixing portion 244 and other structures. The third fixing portion 243 and the fourth fixing portion 244 cooperate to restrict 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 coming off the housing 21, and thus the elastic member 23 can be more stably abutted between the fixing portion 24 and the cell assembly 22.

[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 from the first wall 213 toward the second wall 214 on the inner surface of the first wall 213. The third fixing portion 243 and the first wall 213 may be provided separately and connected together. The third fixing portion 243 and the first wall 213 may be fixedly connected, for example, by welding or adhesive connection, to enhance the connection stability between the third fixing portion 243 and the first wall 213. The third fixing portion 243 and the first wall 213 may be detachably connected, for example, by bolt connection, to facilitate the 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, which saves costs.

[0179] In another embodiment, the third fixing portion 243 and the first wall 213 may be integrally molded. The third fixing portion 243 may be a folded structure provided at an end of the first wall 213, which makes it easier to manufacture and mold the third fixing portion 243.

[0180] The number of third fixing portions 243 may be one or more. In an embodiment in which the number of third fixing portions 243 is more than one, the third fixing portions 243 are arranged at intervals along the third direction Z. In Figures 2, 3, 15, and 16, the number of third fixing portions 243 is two.

[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 from the second wall 214 toward the first wall 213 on the inner surface of the second wall 214. The fourth fixing portion 244 and the second wall 214 may be provided separately and connected together. The fourth fixing portion 244 and the second wall 214 may be fixedly connected, for example, by welding or adhesive connection, to enhance the connection stability between the fourth fixing portion 244 and the second wall 214. The fourth fixing portion 244 and the second wall 214 may be detachably connected, for example, by bolt connection, to facilitate the 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, which saves costs. In another embodiment, the fourth fixing portion 244 and the second wall 214 may be integrally molded. The fourth fixing portion 244 may be a folded structure provided at an end of the second wall 214, which makes it easier to manufacture and mold the fourth fixing portion 244.

[0182] The number of fourth fixing portions 244 may be one or more. In an embodiment in which the number of fourth fixing portions 244 is more than one, the multiple fourth fixing portions 244 are arranged at intervals along the third direction Z. In Figures 2, 3, 15, and 16, the case in which the number of fourth fixing portions 244 is two is shown.

[0183] In some embodiments, the battery module 20 further includes a first insulating member 25 (shown in FIG. 2 ). The first insulating member 25 is provided between the first wall 213 and the cell assembly 22 along the first direction X. The first insulating member 25 can play a role in insulating between the first wall 213 and the cell assembly 22, and can also prevent friction between the cell assembly 22 and the first wall 213 and enhance the service life of the housing 21. The projection of the cell assembly 22 along the first direction X is located within the projection of the first insulating member 25. In this way, after the cell assembly 22 expands, even if the cell assembly 22 moves a certain distance within the housing 21, the first insulating member 25 is still located between the first wall 213 and the cell assembly 22.

[0184] An embodiment of the present application further provides a power consuming device, comprising a battery module according to any one of the above embodiments and / or a battery pack according to any one of the above embodiments.

[0185] The reliability of the battery module 20 and the battery pack 100 described in any one of the above embodiments is good, which is advantageous in improving the reliability of the power consuming device to which power is supplied by the battery module 20 and the battery pack 100.

[0186] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application. [Explanation of symbols]

[0187] 100 battery packs, 10 Front cover, 10a input terminal, 10b output terminal, 20 battery modules, 21 Case, 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 Cell, 2211a first end surface, 2211b a second end surface; 2211 Cell case, 22111a Main body, 22111b first sealing portion, 22111c a second sealing portion; 22112 Electrode Assembly, 22113 Electrode terminal, 2212 Holder, 22121 First extension, 22122 second extension, 22123 Connection, 222 first conductive member, 223 second conductive member, 22a first end, 23 Elastic member, 231 base, 2311 Reinforcing rib, 2312 second end, 232 second connection part, 2321 third end, 2322 Extension, 233 buffer section, 233a first folding means; 2331 first segment, 2332 second segment, 24 fixed part, 241 first fixed part, 242 second fixed part, 243 third fixed part, 244 fourth fixed part, 25 first insulating member, 30 circuit boards, X first direction, Y the second direction, Z third direction, Q1 Gap, Q2 Cushioning material.

Claims

1. A battery module, a housing having a first wall and a second wall disposed opposite each other along a first direction; a cell assembly received in the housing and supported by the first wall; an elastic member arranged together with the cell assembly along a second direction perpendicular to the first direction; a gap exists between the resilient member and the second wall along the first direction, and the resilient member extends beyond the cell assembly; A battery module comprising:

2. the cell assembly includes a plurality of cell units, the plurality of cell units being stacked and arranged along a second direction, the cell unit including a cell and a holder, the holder including a first extension portion, the first extension portion covering 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 portion along the first direction. The battery module according to claim 1 .

3. The holder includes a second extension portion, the second extension portion covering a portion of the cell; At least one of the second extensions is located between the cell and the first wall along the first direction. The battery module according to claim 2 .

4. the cell comprises a cell case, an electrode assembly, and an electrode terminal, the cell case comprises a body portion and a first sealing portion, the electrode assembly is provided in the body portion, and the electrode terminal protrudes from the first sealing portion to the outside of the cell case; The first extension portion covers a portion of the first sealing portion, and / or The second extension portion covers a part of the first sealing portion. The battery module according to claim 3 .

5. the cell case includes two second sealing portions disposed opposite each other along the first direction, the two second sealing portions being located on both sides of the main body portion along the first direction, The first extension portion covers a portion of one of the second sealing portions and a portion of the main body portion, and / or The second extension portion covers a part of the second sealing portion and a part of the main body portion. The battery module according to claim 4 .

6. The holder includes a connection portion, and the connection portion connects the first extension portion and the second extension portion. The battery module according to any one of claims 3 to 5.

7. The holder is integrally molded with the cell. The battery module according to any one of claims 2 to 5.

8. the elastic member includes 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 portion exceeds the cell assembly and / or the buffer portion exceeds the cell assembly. The battery module according to any one of claims 1 to 5.

9. The buffer section includes at least one first folding means, the first folding means including a first segment and a second segment connected to each other, and an angle between the first segment and the second segment is B, where 0°<B<90°. The battery module according to claim 8 .

10. The elastic member is housed in the housing, and the second connection portion is fixed to the housing. The battery module according to claim 8 .

11. the elastic member includes two extensions extending beyond both ends of the base along a third direction, the two extensions being fixed to the housing, and the first direction, the second direction, and the third direction being perpendicular to each other; The battery module according to claim 10 .

12. A battery pack comprising: The battery module according to any one of claims 1 to 5, A front cover connected to the housing. A battery pack comprising:

13. 1. A power consuming device, comprising: Comprising at least one battery pack according to claim 12.

1. A power consuming device comprising:

Images