Battery module, battery pack, and electric equipment

Abstract

To provide a battery module which improves the reliability of a battery.SOLUTION: A battery module includes a battery cell assembly, an elastic member, and a buffer member; the battery cell assembly includes a plurality of battery cell units which are laminated in a first direction, and each battery cell unit includes a battery cell and a first holder. The battery cell includes a battery cell shell, an electrode assembly, and an electrode terminal; the battery cell shell includes a main body portion and a first sealing portion; and the main body portion is provided with a first end surface and is connected to the first end surface along the first sealing portion. The first holder includes a first covering portion, and the first covering portion covers at least a part of the first end face. The elastic member and the battery cell assembly are arranged along a first direction, and in the first direction, the buffer member is arranged between the elastic member and the battery cell assembly. The buffer member includes a first portion, the first portion exceeds the first end face close to the buffer member in the second direction, and the first direction is perpendicular to the second direction.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] The present invention 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 applied in the fields of portable electronic devices, electric vehicles, power tools, drones, energy storage equipment, etc. As application environments and conditions become more and more complex, higher battery reliability is required. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE DISCLOSURE Embodiments of the present invention provide a battery module, a battery pack and a power consuming device to improve battery reliability. [Means for solving the problem]

[0004] In a first aspect, a battery module includes a battery cell assembly, an elastic member, and a cushioning member, the battery cell assembly includes a plurality of battery cell units stacked along a first direction, each battery cell unit includes a battery cell and a first holder, the battery cell includes a battery cell case, an electrode assembly, and an electrode terminal, the battery cell case includes a main body portion and a first sealing portion, the electrode terminal protrudes from the battery cell case via the first sealing portion, the main body portion has a first end surface, the first sealing portion is connected to the first end surface, the first holder includes a first covering portion, the first covering portion covers at least a portion of the first end surface, the elastic member and the battery cell assembly are arranged along the first direction, and the cushioning member is arranged between the elastic member and the battery cell assembly along the first direction, where the cushioning member includes a first portion, and along a second direction, the first portion exceeds the first end surface close to the cushioning member, and the first direction and the second direction are perpendicular.

[0005] In the above technical solution, the buffer member includes a first portion that exceeds the first end face close to the buffer member, and thus, along the first direction, at least a part of the first portion is located between the elastic member and the first covering portion that is closest to the elastic member. When the battery cell expands, the first covering portion that is closest to the elastic member moves along the direction approaching the elastic member and abuts against the elastic member via the first portion of the buffer member, thereby restricting the first covering portion from moving further in the direction approaching the elastic member, which is advantageous in limiting the amount of expansion of the first sealing portion along the first direction and reducing the risk of poor sealing of the first sealing portion, thereby improving the reliability of the battery module.

[0006] In one or more preferred embodiments above, along the second direction, the first portion extends beyond the first covering portion closer to the cushioning member.

[0007] In the above technical solution, the first portion extends beyond the first covering portion close to the buffer member along the second direction, so that the first portion can accommodate a wider range of deformation of the first holder.

[0008] In one or more of the preferred embodiments described above, the main body portion exceeds the first covering portion in the first direction.

[0009] In the above technical solution, when viewed along the second direction, in the first direction, the main body portion exceeds the first covering portion, so that two adjacent battery cell units have a large space at a position corresponding to the first sealing portion, which is advantageous for heat dissipation and expansion of the battery cells during cycling.

[0010] In one or more preferred embodiments described above, the main bodies of adjacent battery cells are in contact.

[0011] In the above technical solution, the main bodies of adjacent battery cells are in contact with each other, so that when the battery cells expand, the adjacent main bodies come into contact with each other, which is advantageous in that the battery cells press against each other.

[0012] In one or more preferred embodiments above, the elastic member includes a base, a connecting portion, and at least one buffer portion, the base and the connecting portion being spaced apart along a first direction, the base being connected to the buffer member, and the base extending beyond the first portion along a second direction.

[0013] In the above technical solution, the base extends beyond the first portion along the second direction, so that the base can apply a reaction force to the first portion on the side of the first portion that is away from the battery cell assembly, and can act to regulate the position of the cushioning member.

[0014] In one or more of the preferred embodiments described above, the buffer portion includes a first folded structure, the first folded structure including a first folded portion and a second folded portion that are adjacent to each other, and the first folded portion and the second folded portion are arranged to form an angle.

[0015] In the above technical solution, the buffer portion is configured so that the first folded portion and the second folded portion are connected to form an angle, which makes it easy for the buffer portion to deform and absorb the acting force caused by the expansion of the battery cell.

[0016] In one or more preferred embodiments described above, a portion of the first sealing portion is separated from the first covering portion, and a gap is present between the first sealing portion and the base portion.

[0017] In the above technical solution, there is a gap between the first sealing part and the base, which facilitates heat dissipation and provides space for the expansion of the battery cell.

[0018] In one or more preferred embodiments described above, the buffer portion is arranged to provide space for expansion of the battery cell.

[0019] In the above technical solution, the buffer part is arranged to provide space for the expansion of the battery cell, so that when the battery cell expands, the base and the connection part compress the buffer part, and the distance between the base and the connection part becomes smaller, thereby providing space for the expansion of the battery cell.

[0020] In one or more preferred embodiments described above, the battery module further includes a case, the connection portion is fixed to the case, and the battery cell assembly, the elastic member, and the cushioning member are all housed within the case.

[0021] In the above technical solution, the battery cell assembly, the elastic member, and the cushioning member are accommodated in the case, making the structure of the battery module more compact, and the connection part is fixed to the case, which improves the stability of the elastic member in the case and reduces the risk of rattling.

[0022] In one or more preferred embodiments described above, the cushioning member includes a second portion, the first portion extends from the second portion, and along the first direction, a projection of the second portion and a projection of the main portion have an overlapping portion.

[0023] In the above technical solution, the projection of the second part and the projection of the main body part have an overlapping portion along the first direction, so that when the battery cell expands, the main body part, together with the elastic member, presses the second part to deform the second part, thereby providing space for the expansion of the battery cell.

[0024] In the one or more preferred embodiments described above, the first covering portion covers at least a portion of the first sealing portion.

[0025] In the above technical solution, the first covering portion covers at least a portion of the first sealing portion, thereby acting as a limiting force on the first sealing portion and reducing the risk of poor sealing of the first sealing portion due to internal air pressure of the battery cell.

[0026] In one or more preferred embodiments described above, the first holder is integrally formed with the battery cell.

[0027] In the above technical solution, the first holder is integrally molded with the battery cell, which not only facilitates the connection between the first holder and the battery cell, but also has the advantage that the first holder has excellent structural strength and the battery cell and the first holder have a stable connection relationship.

[0028] In one or more preferred embodiments described above, the first holder is integrally injection molded with the battery cell.

[0029] In the above technical solution, the first holder is injection molded integrally with the battery cell, which not only facilitates the connection between the first holder and the battery cell, but also has the advantage that the first holder has excellent structural strength and the battery cell and the first holder have a stable connection relationship.

[0030] In one or more preferred embodiments described above, the battery module further includes a case, the battery cell assembly, the elastic member, and the cushioning member are all provided within the case, the case is provided with a positional restriction portion, the elastic member is located between the cushioning member and the positional restriction portion along the first direction, the elastic member includes a base, a connecting portion, and at least one cushioning portion, the base and the connecting portion are provided at an interval along the first direction, and abut against the cushioning member and the positional restriction portion, respectively, and the cushioning portion connects the base and the connecting portion.

[0031] In the above technical solution, the position restricting part is provided on the side of the elastic member away from the cushioning member, thereby reducing the risk of separation of the elastic member, the cushioning member, and the battery cell assembly, and further reducing the risk of the elastic member, the battery cell assembly, and the cushioning member coming off the case, and it is advantageous for the case, the battery cell assembly, the elastic member, and the cushioning member to be integrally formed, making the structures of the case, the battery cell assembly, the elastic member, and the cushioning member more compact. The base and the connection part abut against the cushioning member and the position restricting part respectively, facilitating the interaction between both the cushioning member and the position restricting part and the elastic member, and the cushioning part can accommodate the change in distance between the base and the connection part, providing space for the expansion of the battery cell.

[0032] In the one or more preferred embodiments described above, the number of buffer parts and the number of connecting parts are both plural, and each of the connecting parts is connected to the base part via one buffer part.

[0033] In the above technical solution, the number of the buffer parts and the connecting parts may be multiple, which makes it easier to absorb the acting force caused by the expansion and deformation of the battery cells.

[0034] In one or more preferred embodiments described above, the number of buffer parts and connecting parts is two, the two buffer parts are respectively connected to two edges of the base in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0035] In the above technical solution, the number of buffer parts and the number of connection 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.

[0036] In one or more of the preferred embodiments described above, an opening is provided at one end of the case along the first direction, and the position restriction portion is provided at the end of the case where the opening is provided.

[0037] In the above technical solution, the position restricting part is provided at one end of the case where the opening is located, thereby restricting the battery cell assembly, the buffer member, and the elastic member within the case, so that the case, the battery cell assembly, the buffer member, and the elastic member form a single overall structure, and the case, the battery cell assembly, the buffer member, and the elastic member have a stable relative positional relationship, improving the structural stability of the battery module. After the case lid is removed, the relative positional relationship of the battery cell assembly, the buffer member, and the elastic member is not affected, and the case lid can be easily removed and installed independently.

[0038] In one or more of the above preferred embodiments, the case includes a first wall and a second wall arranged opposite each other along the second direction, the position regulating portion includes a first position regulating portion and a second position regulating portion arranged at a distance along the second direction, the first position regulating portion and the second position regulating portion are connected to the first wall and the second wall, respectively, and the connection portion abuts the first position regulating portion and the second position regulating portion.

[0039] In the above technical proposal, the first position restriction portion and the second position restriction portion are connected to the first wall and the second wall, respectively, that are provided opposite to each other along the second direction, thereby reducing the risk that the first position restriction portion and the second position restriction portion will interfere with other structures. The first position restriction portion restricts the position of the elastic member together with the second position restriction portion, so that the elastic member can more stably abut between the position restriction portion and the buffer member.

[0040] In one or more of the above preferred embodiments, along the second direction, the connection portion has two extension portions that extend beyond both ends of the base portion, and the two extension portions abut against the first position regulating portion and the second position regulating portion, respectively.

[0041] In the above technical solution, since the extension portion abuts the first position control portion and the second position control portion respectively, when the battery cell expands, the connection portion can deform in a direction away from the battery cell assembly, thereby accommodating the expansion of the battery cell and providing space for the deformation of the battery cell.

[0042] In one or more preferred embodiments described above, the case further 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 position restriction portion includes a third position restriction portion and a fourth position restriction portion arranged at a distance along the third direction, the third position restriction portion and the fourth restriction portion are connected to the third wall and the fourth wall, respectively, and the connection portion abuts the third position restriction portion and the fourth position restriction portion.

[0043] In the above technical solution, the third position restriction part and the third restriction are connected to the third wall and the fourth wall respectively, thereby reducing the risk of the third position restriction part and the fourth position restriction part interfering with other structures, and the third position restriction part together with the fourth position restriction part restricts the battery cell assembly, the cushioning member, and the elastic member within the case, thereby reducing the risk of the battery cell assembly, the cushioning member, and the elastic member detaching from the case, so that the elastic member can abut more stably between the position restriction part and the cushioning member.

[0044] In one or more of the above preferred embodiments, an embodiment of the present invention provides a battery pack, which includes a case lid and a battery module provided by any of the above embodiments, wherein the case lid is connected to the battery module.

[0045] In the above technical solution, the case cover is connected to the battery module, which not only protects the structure inside the battery module, but also is favorable to improving the sealing performance of the battery pack, thereby improving the reliability of the battery pack. The reliability of the battery module provided by any of the above embodiments is good, and the reliability of the battery pack including this battery module is also good.

[0046] In one or more of the above preferred embodiments, an embodiment of the present invention further provides a power consuming device, the power consuming device including a battery pack as provided by any of the above embodiments.

[0047] In the above technical solution, the reliability of the battery pack provided by any of the above embodiments is good, which is beneficial for improving the reliability of power consumption of the power consuming device powered by the battery module and the battery pack. [Brief description of the drawings]

[0048] In order to more clearly describe the technical solutions of the embodiments of the present invention, the drawings necessary for the embodiments will be briefly described below, which should be understood to illustrate only some embodiments of the present invention.

[0049] [Figure 1] FIG. 1 is a schematic diagram of a battery pack provided by some embodiments of the present invention. [Diagram 2] FIG. 2 is an exploded view of a battery pack provided by some embodiments of the present invention. [Diagram 3] FIG. 3 is an exploded view of a case provided by some embodiments of the present invention. [Figure 4] FIG. 4 is a structural schematic diagram of a second wall provided by some embodiments of the present invention. [Diagram 5] FIG. 5 is a structural schematic diagram of a battery cell assembly provided by some embodiments of the present invention. [Figure 6] FIG. 6 is a structural schematic diagram of a battery cell provided by some embodiments of the present invention. [Figure 7] FIG. 7 is an exploded view of a battery cell provided by some embodiments of the present invention. [Figure 8] FIG. 8 is a structural schematic diagram of a battery cell unit provided by some embodiments of the present invention. [Figure 9] FIG. 9 is an enlarged view of A1 in FIG. [Figure 10] FIG. 10 is a structural schematic diagram of a battery cell unit provided by some embodiments of the present invention from another perspective. [Figure 11] FIG. 11 is an enlarged view of A2 in FIG. [Figure 12] FIG. 12 is a schematic diagram of a combination of a battery cell assembly, an elastic member, and a cushioning member provided by some embodiments of the present invention. [Figure 13] FIG. 13 is an enlarged view of A3 in FIG. [Figure 14] FIG. 14 is an enlarged view of A31 in FIG. [Figure 15] FIG. 15 is a cross-sectional view of a battery pack provided by some embodiments of the present invention. [Figure 16] FIG. 16 is an enlarged view of A4 in FIG. [Figure 17] FIG. 17 is an enlarged view of A41 in FIG. [Figure 18] FIG. 18 is an enlarged view of A5 in FIG. [Figure 19] FIG. 19 is an enlarged view of A51 in FIG. [Figure 20] FIG. 20 is an enlarged view of A6 in FIG. [Figure 21] FIG. 21 is an enlarged view of A61 in FIG. [Figure 22] FIG. 22 is a schematic diagram of a combination of a part of the case and an elastic member. [Diagram 23] FIG. 23 is a structural schematic diagram of a battery module provided by some embodiments of the present invention. [Figure 24] FIG. 24 is a structural schematic diagram of an elastic member provided by some embodiments of the present invention. [Diagram 25] FIG. 25 is a structural schematic diagram of an elastic member provided by some embodiments of the present invention from another perspective. [Figure 26] FIG. 26 is a view along a first direction of an elastic member provided by some embodiments of the present invention. [Figure 27] FIG. 27 is a view of an elastic member provided by some embodiments of the present invention, taken along a direction opposite to a first direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] At present, from the perspective of the development of the market situation, the application of battery modules is becoming more and more widespread. Battery modules are widely used in multiple fields, such as electric vehicles such as electric bicycles, electric motorbikes, and electric cars, as well as electric tools, drones, energy storage equipment, etc. With the expansion of the application fields of battery modules, their market demand is also expanding.

[0055] The development of battery technology must simultaneously consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, with the changes in environmental conditions and internal conditions of the battery, battery reliability must also be considered as one of the important factors.

[0056] As the battery undergoes charge and discharge cycles, the amount of gas inside the battery cells becomes increasingly larger, causing the battery cells to expand more and more. If this expansion is not restricted to a certain extent, the sealed portion of the battery cells will be easily broken through by the gas inside the battery cells, causing poor sealing of the battery cells and affecting the reliability of the battery.

[0057] Based on the above, an embodiment of the present invention provides a battery module to solve the problem of low reliability of a battery due to an increase in internal air pressure of a battery cell, the battery module including a battery cell assembly, an elastic member, and a cushioning member, the battery cell assembly including a plurality of battery cell units stacked along a first direction, each battery cell unit including a battery cell and a first holder, the battery cell including a battery cell case, an electrode assembly, and an electrode terminal, the battery cell case including a main body portion and a first sealing portion, The pole terminal protrudes from the battery cell case through the first sealing portion, the main body portion has a first end surface, the first sealing portion is connected to the first end surface, the first holder includes a first covering portion, the first covering portion covers at least a portion of the first end surface, the elastic member and the battery cell assembly are provided along a first direction, and the buffer member is provided between the elastic member and the battery cell assembly along the first direction, where the buffer member includes a first portion and along a second direction, the first portion extends beyond the first end surface close to the buffer member, and the first direction and the second direction are perpendicular.

[0058] The cushioning member includes a first portion that extends beyond the first end face closest to the cushioning member, and thus, along the first direction, at least a part of the first portion is located between the elastic member and the first covering portion that is closest to the elastic member, and when the battery cell expands, the first covering portion that is closest to the elastic member can move a short distance along the direction approaching the elastic member and abut against the elastic member via the first portion of the cushioning member, thereby restricting further movement of the first covering portion in the direction approaching the elastic member, which is advantageous in limiting the amount of expansion of the first sealing portion along the first direction and reducing the risk of poor sealing of the first sealing portion, thereby improving the reliability of the battery module.

[0059] An embodiment of the present invention provides a power consuming device using a battery pack or battery module as a power source, and the power consuming device may be, but is not limited to, an electronic device, a power tool, an electric vehicle, a drone, an energy storage facility, etc., where 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., and the electric vehicle may include an electric car, an electric motorcycle, an electric bicycle, etc.

[0060] 1 and 2, the battery pack 100 includes a case lid 10 and a battery module 20. The case lid 10 is connected to the battery module 20.

[0061] The case lid 10 is connected to one side of the battery module 20 along the first direction X, and can seal the battery module 20. The case lid 10 seals the side of the battery module 20 along the first direction X, which not only provides a protective effect for the structure within the battery module 20, but also is advantageous in improving the sealing performance of the battery pack 100, thereby improving the reliability of the battery pack 100.

[0062] The case lid 10 is provided with an input terminal 10a and an output terminal 10b, which are electrically connected to a common positive electrode and a common negative electrode, respectively, of the battery cell assembly 22. The input terminal 10a and the output terminal 10b are used to charge the battery pack 100 or to discharge the electric energy of the battery pack 100 by electrically connecting them to an external device.

[0063] In some embodiments, the battery pack 100 includes a circuit board 30 that is connected to the battery cell assemblies 22 .

[0064] In some embodiments, the circuit board 30 includes a Battery Management System (BMS) board. The circuit board 30 may be provided with circuit elements, such as information gathering elements.

[0065] The battery module 20 includes a case 21. An accommodation space 211 is formed in the case 21. The battery cell assembly 22 is accommodated in the accommodation space 211.

[0066] In some embodiments, the case 21 may be an integrally molded structure, and an opening 212 is formed at one end of the accommodation space 211 along the first direction X, and the case lid 10 seals the opening 212. The case lid 10 seals the opening 212 of the case 21 of the battery module 20, which not only provides a protective effect for the structure inside the case 21, but is also advantageous in improving the sealing performance of the battery pack 100, thereby improving the reliability of the battery pack 100.

[0067] The case lid 10 is connected to the case 21 so as to seal the opening 212. The connection between the case lid 10 and the case 21 may be a removable connection such as a bolt connection or a snap connection, which makes it easy to remove the case lid 10 and makes it easy to maintain the case 21 and the case lid 10 independently. The connection between the case lid 10 and the case 21 may be a fixed connection such as a welding connection or an adhesive connection, which improves the connection stability between the case lid 10 and the case 21 and the sealing performance between the case lid 10 and the case 21.

[0068] 2 and 3, case 21 includes a plurality of walls, which commonly form accommodation space 211. The plurality of walls can be integrally molded to form case 21, and case 21 can be formed by an integral molding method such as casting, injection, or punching.

[0069] The plurality of wall portions may be formed such that some of them are integrally molded and other portions are integrally connected in a certain connection relationship to form case 21 having storage space 211.

[0070] In another embodiment, each wall of the case 21 can be provided separately and connected in a certain manner to form the case 21, and the connection between each wall can include, but is not limited to, a welded connection, an adhesive connection, etc.

[0071] As shown in FIGS. 2 and 3 , the case 21 includes a first wall 213 , a second wall 214 , a third wall 215 , a fourth wall 216 , and a fifth wall 217 .

[0072] The first wall 213 and the second wall 214 are provided to face each other along the second direction Y. The third wall 215 and the fourth wall 216 are provided to face each other along the third direction Z.

[0073] The opening 212 and the fifth wall 217 are provided facing each other along the first direction X. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0074] In some embodiments, the third wall 215 supports the gravity of the battery cell assembly 22, thereby supporting the battery cell assembly 22. The first wall 213 and the second wall 214 are connected to both ends of the third wall 215 along the second direction Y, respectively.

[0075] The first wall 213, the second wall 214, and the third wall 215 can be integrally formed. The fourth wall 216 is connected to one end of the first wall 213 remote from the third wall 215 and to one end of the second wall 214 remote from the third wall 215.

[0076] The connection between the fourth wall 216 and the first wall 213 may be a removable connection, such as a bolted connection, a snap connection, or the like, thereby facilitating maintenance and replacement of the fourth wall 216 and the first wall 213.

[0077] The connection between the second wall 214 and the fourth wall 216 may be a fixed connection, such as a welded connection, an adhesive connection, or the like, which facilitates manufacturing and forming of the second wall 214 and the fourth wall 216 .

[0078] The connection between the fourth wall 216 and the second wall 214 may be a removable connection, such as a bolted connection, a snap connection, or the like, thereby facilitating maintenance and replacement of the second wall 214 and the fourth wall 216 .

[0079] 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, and the fifth wall 217 and the opening 212 of the storage space 211 are arranged opposite each other along the first direction X.

[0080] The first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 are each fixedly connected to the fifth wall 217, which may be, for example, a welded connection, an adhesive connection, or the like.

[0081] The first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 may each be removably connected to the fifth wall 217 to facilitate maintenance and replacement of each portion of the case 21, and the removably connections may be bolt connections, snap connections, etc.

[0082] In another embodiment, the first wall 213, the second wall 214, the third wall 215, and the fourth wall 216 can be integrally molded with the fifth wall 217, thereby making the case 21 easier to manufacture and providing the case 21 with greater structural strength.

[0083] As shown in FIGS. 2 and 3, the third wall 215 is provided with two first fixing portions 2151, and the two first fixing portions 2151 are provided in the second direction Y at an interval therebetween.

[0084] The first fixing portions 2151 protrude from the inner surface of the third wall 215. When the battery cell assembly 22 is supported by the third wall 215, the two first fixing portions 2151 can restrict the battery cell assembly 22 from moving along the second direction Y and the direction Y' opposite to the second direction Y, thereby improving the stability of the battery cell assembly 22 within the case 21.

[0085] The first fixing portion 2151 can be formed by punching out from the outer surface of the third wall 215, and during the punching process, a recess is formed in the outer surface of the third wall 215, and the first fixing portion 2151 protruding from the inner surface of the third wall 215 is formed.

[0086] The inner surface of the third wall 215 is the surface of the third wall 215 that faces the battery cell assembly 22 along the third direction Z, and the outer surface of the third wall 215 is the surface of the third wall 215 that faces away from the battery cell assembly 22 along the opposite direction to the third direction Z.

[0087] As shown in FIG. 4, the fourth wall 216 is provided with two second fixing portions 2161, and the two second fixing portions 2161 are provided in the second direction Y at an interval therebetween.

[0088] The second fixing portions 2161 protrude from the inner surface of the fourth wall 216. The two second fixing portions 2161 can restrict the battery cell assembly 22 from moving along the second direction Y and the direction Y' opposite to the second direction Y, thereby improving the stability of the battery cell assembly 22 within the case 21.

[0089] The second fixing portion 2161 can be formed by punching out from the outer surface of the fourth wall 216, and during the punching process, a recess is formed in the outer surface of the fourth wall 216 and the second fixing portion 2161 protruding from the inner surface of the fourth wall 216 is formed.

[0090] The inner surface of the fourth wall 216 is the surface of the fourth wall 216 that faces the battery cell assembly 22 along the direction opposite to the third direction Z, and the outer surface of the fourth wall 216 is the surface of the fourth wall 216 that faces away from the battery cell assembly 22 along the third direction Z.

[0091] As shown in FIGS. 5 and 6, the battery cell assembly 22 includes a plurality of battery cell units 221, which are stacked along a first direction X. The term "plural" means two or more than two. Each battery cell unit 221 includes a battery cell 2211. The battery cell 2211 may be a hard-shell battery cell or a soft-pack battery cell. The battery cell 2211 includes a battery cell case 22111, an electrode assembly 22112, and an electrode terminal 22113. The electrode assembly 22112 is accommodated in the battery cell case 22111. The material of the battery cell case 22111 may be aluminum plastic film, steel plastic film, etc.

[0092] 6 and 7 show a case where the battery cell 2211 is a soft-pack battery cell. As shown in FIG. 6 and FIG. 7, the battery cell case 22111 includes a main body portion 22111a and a first sealing portion 22111b, and in the second direction Y, the main body portion 22111a has a first end surface 2211a. The first sealing portion 22111b is connected to the first end surface 2211a. Along the second direction Y, the first sealing portion 22111b protrudes from the first end surface 2211a. The electrode assembly 22112 is accommodated in the main body portion 22111a. The electrode terminal 22113 is connected to the electrode assembly 22112 and extends from the first sealing portion 22111b to the outside of the battery cell case 22111.

[0093] The battery cell 2211 includes 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.

[0094] In some embodiments, the two electrode terminals 22113 may be located at the same end of the battery cell 2211 in the second direction Y, and both electrode terminals 22113 extend from the same first sealing portion 22111b to the outside of the battery cell case 22111, thereby facilitating a rational arrangement of the battery cell assembly 22 within the case 21, making full use of the internal space of the case 21, and facilitating other structures to electrically connect to the two electrode terminals 22113.

[0095] As shown in FIGS. 5 to 7, in another embodiment, the two electrode terminals 22113 can be located at both opposing ends of the battery cell 2211. The battery cell case 22111 includes two first sealing portions 22111b, and the two first sealing portions 22111b are located on both sides of the main body portion 22111a in the second direction Y. 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 provided opposite to each other along the second direction Y. By respectively positioning the two electrode terminals 22113 at both opposing ends of the battery cell 2211, the risk of a short circuit in the battery cell assembly 22 can be reduced.

[0096] In some embodiments, the battery cell case 22111 includes two second sealing portions 22111c provided opposite each other along the third direction Z, and the two second sealing portions 22111c are located on both sides of the main body portion 22111a along the third direction Z. This not only facilitates assembly and molding of the battery cell 2211, but is also advantageous in improving the sealing performance of the battery cell 2211.

[0097] The multiple battery cells 2211 may be in series or in parallel, or some of the multiple battery cells 2211 may be in series and others may be in parallel.

[0098] As shown in FIG. 5, the battery cell assembly 22 further includes a first conductive member 222 and a second conductive member 223, in which the first conductive member 222 is electrically connected to one electrode terminal 22113 of the battery cell 2211 to form a common positive electrode of the battery cell assembly 22, and the second conductive member 223 is electrically connected to another electrode terminal 22113 of the battery cell 2211 to form a common negative electrode of the battery cell assembly 22, and the common positive electrode and the common negative electrode are electrically connected to the input terminal 10a and the output terminal 10b, respectively.

[0099] 5 and 8 to 10, in some embodiments, the battery cell unit 221 further includes a first holder 2212. The first holder 2212 is provided on the battery cell 2211.

[0100] In some embodiments, the main body parts 22111a of the battery cells 2211 in two adjacent battery cell units 221 are in contact and connected, so that when the battery cells 2211 expand, the adjacent main body parts 22111a abut and the battery cells 2211 are advantageously pressed against each other.

[0101] In some embodiments, the first holder 2212 includes a first covering portion 22121. The first covering portion 22121 covers at least a portion of the first end surface 2211a, thereby limiting deformation of the main body portion 22111a, reducing the risk of drum deformation of the first end surface 2211a, and improving the reliability of the battery module 20. The first covering portion 22121 can be connected to the first end surface 2211a, or can be bonded only to the first end surface 2211a.

[0102] In this embodiment, the first holder 2212 includes two first covering portions 22121, and the two first covering portions 22121 are located on both sides of the first sealing portion 22111b that face each other in the first direction X. The two first covering portions 22121 each cover a part of the first end surface 2211a that is located on both sides of the first sealing portion 22111b. The two first covering portions 22121 are located on both sides of the first sealing portion 22111b that face each other in the first direction X, thereby enhancing protection of the battery cell 2211.

[0103] In some embodiments, a portion of one first sealing portion 22111b is separated from the first covering portion 22121 connected to the first sealing portion 22111b. Note that the first covering portion 22121 covers a portion of the corresponding first sealing portion 22111b, and the portion of the first sealing portion 22111b that is not covered by the first covering portion 22121 can expand when the internal pressure of the battery cell 2211 reaches a certain pressure.

[0104] In some embodiments, the first covering portion 22121 covers at least a portion of the first sealing portion 22111b, thereby acting as a regulating portion for the first sealing portion 22111b, thereby reducing the risk of poor sealing of the first sealing portion 22111b due to internal air pressure of the battery cell 2211, and improving the sealing performance of the battery cell 2211.

[0105] In some embodiments, the main body portion 22111a exceeds the first covering portion 22121 in the first direction X (as shown in FIG. 13 ), so that two adjacent battery cell units 221 have a large space at a position corresponding to the first sealing portion 22111b, which is favorable for heat dissipation and expansion of the battery cell 2211 during cycling.

[0106] The first holder 2212 is further provided with a first notch 22122b, and the first notch 22122b exposes a part of one end of the first sealing portion 22111b that is separated from the main body portion 22111a. This allows the first holder 2212 to function as a pressure relief valve, that is, when the internal pressure of the battery cell 2211 reaches a threshold value, the pressure is released through the first notch 22122b, thereby reducing the risk of thermal runaway of the battery module 20.

[0107] The number of first notches 22122b may be one or more. The multiple first notches 22122b are provided at intervals along the third direction Z.

[0108] In an embodiment in which two electrode terminals 22113 are located at opposite ends of the battery cell 2211 along the second direction Y, as shown in Fig. 11, Fig. 12, and Fig. 13, the battery cell unit 221 includes a second holder 2213, and the second holder 2213 includes a second covering portion 22131. The second covering portion 22131 covers at least a part of the second end surface 2211b, thereby limiting deformation of the main body portion 22111a, reducing the risk of drum deformation at the second end surface 2211b, and improving the reliability of the battery module 20. The second covering portion 22131 can be connected to the second end surface 2211b, or can be bonded only to the second end surface 2211b.

[0109] In this embodiment, the second holder 2213 includes two second covering portions 22131, and the two second covering portions 22131 are located on opposite sides of another first sealing portion 22111b in the first direction X. The two second covering portions 22131 each cover a portion of the second end surface 2211b located on both sides of the first sealing portion 22111b.

[0110] In some embodiments, a part of the first sealing portion 22111b corresponding to the second holder 2213 is separated from the second covering portion 22131. Note that the second covering portion 22131 covers a part of the corresponding first sealing portion 22111b, and the part of the first sealing portion 22111b that is not covered by the second covering portion 22131 can expand when the internal pressure of the battery cell 2211 reaches a certain pressure.

[0111] In some embodiments, the second covering portion 22131 covers at least a portion of the first sealing portion 22111b, thereby acting as a regulating portion for the first sealing portion 22111b and reducing the risk of poor sealing of the first sealing portion 22111b due to the internal air pressure of the battery cell 2211.

[0112] In some embodiments, when viewed along the second direction Y, the main body portion 22111a exceeds the second covering portion 22131 in the first direction X (as shown in FIG. 23 ), so that two adjacent battery cell units 221 have a large space at the position corresponding to the first sealing portion 22111b, which is favorable for heat dissipation and expansion of the battery cell 2211 during cycling.

[0113] Here, the distance between the second covering portion 22131 located on the side of the first sealing portion 22111b facing the elastic member 224 in the two second covering portions 22131 and the elastic member 224 is greater than the distance between the surface of the main body portion 22111a facing the elastic member 224 and the elastic member 224. The distance between the second covering portion 22131 located on the side of the first sealing portion 22111b away from the elastic member 224 in the two second covering portions 22131 and the elastic member 224 is smaller than the distance between the surface of the main body portion 22111a away from the elastic member 224 and the elastic member 224.

[0114] In an embodiment in which the first holder 2212 is provided with the first notch 22122b, the second holder 2213 may not be provided with a notch that functions as a pressure relief valve. Of course, in another embodiment, the second holder 2213 may be provided with a second notch (not shown), and the second notch exposes a part of one end of the first sealing portion 22111b that is separated from the main body portion 22111a. Since the part of the first sealing portion 22111b located at the second notch is not restricted by the second holder 2213, it can function as a pressure relief valve, that is, when the internal pressure of the battery cell 2211 reaches a threshold value, the pressure is released from the second notch, thereby reducing the risk of thermal runaway of the battery module 20.

[0115] The structure of the first holder 2212 may be the same as or different from that of the second holder 2213. In the embodiment of the present invention, the first holder 2212 and the second holder 2213 have different structures.

[0116] There are several types of configurations in which the first holder 2212 is provided to the battery cell 2211, such as a configuration in which the first holder 2212 is adhered to the battery cell 2211, a configuration in which the first holder 2212 is welded to the battery cell 2211, and the like.

[0117] In some embodiments, the first holder 2212 can be integrally molded with the battery cell 2211, which not only facilitates the connection between the first holder 2212 and the battery cell 2211, but also favors that the first holder 2212 has good structural strength and has a stable connection relationship between the battery cell 2211 and the first holder 2212. The integral molding method includes, but is not limited to, an injection process, an injection process.

[0118] In some embodiments, the insulating material is placed around the battery cell 2211 by an injection process, and then the insulating material is cured to form the first holder 2212, and the first holder 2212 and the battery cell 2211 are bonded and fixed. For example, the battery cell 2211 is placed in a mold, the insulating material is injected into the mold, the insulating material is cured to form the first holder 2212, and then the first holder 2212 and the battery cell 2211 are removed from the mold.

[0119] In some embodiments, the insulating material includes, but is not limited to, potting rubber, foam rubber.

[0120] In some embodiments, the injection molding process includes: placing the battery cell 2211 into a mold, heating and melting the insulating material by an injection device, pouring the molten insulating material into the mold, hardening the insulating material to form the first holder 2212 and adhering and fixing with the battery cell 2211, and then removing the first holder 2212 and the battery cell 2211 from the mold. Preferably, the insulating material includes polyamide.

[0121] In some embodiments, the first holder 2212 is an insulating holder, which can reduce the risk of short circuit between the first holder 2212 and the battery cell 2211.

[0122] In an embodiment in which the battery cell unit 221 includes the second holder 2213, the second holder 2213 can be integrally molded with the battery cell 2211, which not only facilitates the connection between the second holder 2213 and the battery cell 2211, but also favors that the second holder 2213 has good structural strength and has a stable connection relationship between the battery cell 2211 and the second holder 2213. The integral molding method includes, but is not limited to, an injection process, an injection process.

[0123] In some embodiments, the insulating material is placed around the battery cell 2211 by an injection process, and then the insulating material is cured to form the second holder 2213, and the second holder 2213 and the battery cell 2211 are bonded and fixed. For example, the battery cell 2211 is placed in a mold, the insulating material is injected into the mold, the insulating material is cured to form the second holder 2213, and then the second holder 2213 and the battery cell 2211 are removed from the mold.

[0124] In some embodiments, the insulating material includes, but is not limited to, potting rubber, foam rubber.

[0125] In some embodiments, the injection molding process includes: placing the battery cell 2211 into a mold, heating and melting the insulating material by an injection device, pouring the molten insulating material into the mold, hardening the insulating material to form the second holder 2213 and adhering and fixing with the battery cell 2211, and then removing the second holder 2213 and the battery cell 2211 from the mold. Preferably, the insulating material includes polyamide.

[0126] In some embodiments, the second holder 2213 is an insulating holder, which can reduce the risk of short-circuiting between the second holder 2213 and the battery cell 2211.

[0127] 14 to 23, in some embodiments, the battery module 20 includes an elastic member 224. The elastic member 224 and the battery cell assemblies 22 are arranged along a first direction X. When the battery module 20 expands, the elastic member 224 is compressed along the first direction X, thereby providing space for the expansion of the battery cell assemblies 22.

[0128] The material of the elastic member 224 includes, but is not limited to, metal, plastic, and the like.

[0129] As shown in FIGS. 12 to 21, in some embodiments, the battery module 20 includes a buffer member 225, which is provided between the elastic member 224 and the battery cell assembly 22 along the first direction X.

[0130] When the battery cell assembly 22 expands, the cushioning member 225 can provide a space for the expansion of the battery cell assembly 22. Not only can the elastic member 224 cooperate with the cushioning member 225 to provide a large space for the expansion of the battery cell assembly 22, but it is also advantageous that the elastic member 224, the cushioning member 225, and the battery cell assembly 22 are always in contact with each other, which is also advantageous for improving the structural compactness of the battery module 20 and reducing the risk of the battery module 20 rattling in the case 21.

[0131] The cushioning material 225 includes, but is not limited to, foam cotton, rubber mat, silica gel, and the like.

[0132] 14 to 19, in some embodiments, the buffer member 225 includes a first portion 2251, and the first portion 2251 extends beyond a first end face 2211a that is closer to the buffer member 225 along the second direction Y. The second direction Y is perpendicular to the first direction X.

[0133] In some embodiments, the first portion 2251 may extend only beyond the first end surface 2211a, without extending beyond the first covering portion 22121, along the second direction Y. The entire first portion 2251 is located between the first covering portion 22121 and the elastic member 224.

[0134] In some embodiments, along the second direction Y, the first portion 2251 exceeds the first covering portion 22121 close to the buffer member 225. It is understood that along the second direction Y, the first portion 2251 exceeds not only the first end surface 2211a but also the surface away from the first end surface 2211a of the first covering portion 22121, and thus, a part of the first portion 2251 is located between the first covering portion 22121 and the elastic member 224, and another part of the first portion 2251 extends from the space between the first covering portion 22121 and the elastic member 224. The first portion 2251 can accommodate a larger deformation of the first holder 2212, and the first covering portion 22121 can abut against the first portion 2251 even after the first holder 2212 generates a larger deformation.

[0135] Therefore, the buffer member 225 includes a first portion 2251 that extends beyond the first end face 2211a, and at least a part of the first portion 2251 is located between the elastic member 224 and the first covering portion 22121 of the first holder 2212 that is closest to the elastic member 224.

[0136] When the battery cell 2211 expands, the first covering portion 22121 can abut against the elastic member 224 via the first part 2251 of the cushioning member 225 if it moves only a small distance in the direction approaching the elastic member 224, thereby restricting the first covering portion 22121 from moving further in the direction approaching the elastic member 224. This is advantageous in limiting the amount of expansion of the first sealing portion 22111b along the first direction X and reducing the risk of poor sealing of the first sealing portion 22111b, thereby improving the reliability of the battery module 20.

[0137] In some embodiments, the cushioning member 225 includes a second portion 2252, and the first portion 2251 extends from the second portion 2252, and along the first direction X, the projection of the second portion 2252 and the projection of the main body portion 22111a have an overlapping portion.

[0138] In addition, the second portion 2252 is located between the main body portion 22111a of the battery cell 2211 that is closest to the elastic member 224 in the battery cell assembly 22 and the elastic member 224. When the battery cell 2211 expands in this manner, the main body portion 22111a presses the second portion 2252 together with the elastic member 224, deforming the second portion 2252 and providing space for the expansion of the battery cell 2211.

[0139] In an embodiment in which the two electrode terminals 22113 are located at opposite ends of the battery cell 2211, respectively, and the second holder 2213 further includes a second covering portion 22131, as shown in Figures 12, 15, and 18 to 21, the buffer member 225 further includes a third portion 2253 along the opposite direction Y' to the second direction Y, and the third portion 2253 extends from the second portion 2252 along the opposite direction Y' to the second direction Y. The third portion 2253 extends beyond the second end face 2211b.

[0140] In some embodiments, the cushioning member 225 includes a third portion 2253 that extends beyond the second end surface 2211b, and at least a portion of the third portion 2253 is located between the elastic member 224 and the second covering portion 22131 of the first holder 2212 closest to the elastic member 224.

[0141] When the battery cell 2211 expands, the second covering portion 22131 moves a small distance in a direction approaching the elastic member 224, and then comes into contact with the elastic member 224 via the third part 2253 of the buffer member 225, thereby restricting the second covering portion 22131 from moving further in the direction approaching the elastic member 224. This is advantageous in limiting the amount of expansion of the first sealing portion 22111b along the first direction X and reducing the risk of poor sealing of the first sealing portion 22111b, thereby improving the reliability of the battery module 20.

[0142] Here, along the direction Y' opposite to the second direction Y, the third portion 2253 can extend beyond only the second end surface 2211b without extending beyond the second covering portion 22131. The entire third portion 2253 is located between the second covering portion 22131 and the elastic member 224.

[0143] In another embodiment, the third portion 2253 exceeds the second covering portion 22131 along the opposite direction Y' of the second direction Y. It is understood that the third portion 2253 exceeds not only the second end surface 2211b but also the surface away from the second end surface 2211b of the second covering portion 22131 along the opposite direction Y' of the second direction Y, and thus a part of the third portion 2253 is located between the second covering portion 22131 and the elastic member 224, and another part of the third portion 2253 extends from the space between the second covering portion 22131 and the elastic member 224 along the opposite direction Y' of the second direction Y. The third portion 2253 can accommodate a larger deformation of the second holder 2213, and the second covering portion 22131 can abut against the third portion 2253 even after the second holder 2213 generates a larger deformation.

[0144] 2, 3, 22, and 23, in some embodiments, the case 21 is provided with a position restriction portion 23, and the elastic member 224 is located between the buffer member 225 and the position restriction portion 23 along the first direction X. By providing the position restriction portion 23 on the side of the elastic member 224 away from the buffer member 225, the risk of the elastic member 224, the buffer member 225, and the battery cell assembly 22 being separated can be reduced, and further, the risk of the elastic member 224, the battery cell assembly 22, and the buffer member 225 being detached from the case 21 can be reduced. This is advantageous in that the case 21, the battery cell assembly 22, the elastic member 224, and the buffer member 225 are integrally formed, and the structure of the case 21, the battery cell assembly 22, the elastic member 224, and the buffer member 225 can be made more compact.

[0145] Here, in the first direction X, one end of the elastic member 224 is fixed to the buffer member 225, and the other end of the elastic member 224 is connected to the position regulating portion 23, thereby improving the stability of the elastic member 224 between the buffer member 225 and the position regulating portion 23.

[0146] In some embodiments, along the first direction X, one end of the elastic member 224 abuts the buffer member 225. The elastic member 224 and the buffer member 225 can be in direct abutment, that is, the elastic member 224 and the buffer member 225 are in direct contact. The elastic member 224 and the buffer member 225 can also be in indirect abutment.

[0147] Along the first direction X, the other end of the elastic member 224 abuts against the position restricting portion 23. The elastic member 224 and the position restricting portion 23 can be in direct abutment, that is, the elastic member 224 and the position restricting portion 23 are in direct contact. The elastic member 224 and the position restricting portion 23 can also be in indirect abutment, for example, a buffer structure is provided between the elastic member 224 and the position restricting portion 23, and the elastic member 224 and the position restricting portion 23 are in indirect abutment via the buffer structure. The buffer structure may be foam cotton.

[0148] As shown in FIGS. 24 to 27, in some embodiments, the elastic member 224 includes a base portion 2241, a connecting portion 2242, and at least one buffer portion 2243, where the base portion 2241 and the connecting portion 2242 are spaced apart from each other along the first direction X, and the buffer portion 2243 connects the base portion 2241 and the connecting portion 2242.

[0149] In some embodiments, along the second direction Y, the base 2241 extends beyond the first portion 2251 , thereby advantageously causing the base 2241 to exert pressure against the battery cell assembly 22 .

[0150] In some embodiments, the base 2241 is connected to the cushioning member 225. Preferably, the base 2241 is in contact with and connected to the cushioning member 225, so that the base 2241 abuts against the cushioning member 225. Preferably, the base 2241 and the cushioning member 225 can be connected via another member.

[0151] In some embodiments, the connection portion 2242 is fixed to the case 21. Preferably, the connection portion 2242 is fixed to the position restriction portion 23.

[0152] In some embodiments, fastening includes, but is not limited to, abutting, gluing, welding, fastening with a fastener, snap connection, and the like.

[0153] In some embodiments, the battery cell assembly 22, the elastic member 224, and the cushioning member 225 are all housed within the case 21, which is advantageous for maintenance of the battery pack 100.

[0154] The connection portion 2242 abuts against the position restriction portion 23. When the battery cell 2211 expands, the distance between the base portion 2241 and the connection portion 2242 along the first direction X changes, and the buffer portion 2243 can accommodate the change in distance between the base portion 2241 and the connection portion 2242, thereby accommodating the expansion of the battery cell 2211. Preferably, the connection portion 2242 is connected in contact with the position restriction portion 23. Preferably, the connection portion 2242 and the position restriction portion 23 can be connected via another member.

[0155] In some embodiments, along the second direction Y, the base 2241 extends beyond the first portion 2251, thereby allowing the base 2241 to exert a reaction force on the first portion 2251 on the side of the first portion 2251 that faces away from the battery cell assembly 22 and to exert a positional regulating effect on the cushioning member 225.

[0156] In some embodiments, along the direction Y' opposite to the second direction Y, the base 2241 extends beyond the third portion 2253, thereby allowing the base 2241 to apply a reaction force to the third portion 2253 on the side of the third portion 2253 that faces away from the battery cell assembly 22 and to exert a positional regulating effect on the cushioning member 225.

[0157] In some embodiments, a portion of the first sealing portion 22111b is separated from the first covering portion 22121, and there is a gap between the first sealing portion 22111b and the base 2241, which may be an air gap Q1, thereby facilitating heat dissipation and providing space for expansion of the battery cell 2211.

[0158] In some embodiments, a portion of the first sealing portion 22111b is separated from the second covering portion 22131, and there is a gap between the first sealing portion 22111b and the base 2241, which may be an air gap Q1, thereby facilitating heat dissipation and providing expansion space for the battery cell 2211.

[0159] The buffer portion 2243 is arranged to provide space for the expansion of the battery cell 2211, and when the battery cell 2211 expands, the base 2241 compresses the buffer portion 2243, and the distance between the base 2241 and the connection portion 2242 becomes smaller, thereby providing space for the expansion of the battery cell 2211.

[0160] There are various types of structures for the buffer part 2243, for example, the buffer part 2243 has a semicircular arc structure, an S-shaped structure, a Z-shaped structure, etc. As shown in Fig. 24 to Fig. 27, in some embodiments, the buffer part 2243 has a bent structure provided between the base part 2241 and the connection part 2242, and the structure is simple, facilitating processing and manufacturing, and can well accommodate changes in the distance between the base part 2241 and the connection part 2242.

[0161] As shown in FIG. 25, in some embodiments, the buffer portion 2243 includes at least one first folding structure 2243a disposed between the base portion 2241 and the connecting portion 2242, and the first folding structure 2243a includes a first folding portion 22431 and a second folding portion 22432 that are adjacent to each other, and the first folding portion 22431 and the second folding portion 22432 are disposed so as to form an angle.

[0162] The buffer part 2243 is provided such that the first bending part 22431 and the second bending part 22432 are connected to form an angle, thereby facilitating the deformation of the buffer part 2243 to absorb the acting force due to the expansion of the battery cell 2211.

[0163] The angle between the first bending part 22431 and the second bending part 22432 is B, where 0° < B < 90°. That is, the first bending part 22431 and the second bending part 22432 can be arranged to form an acute angle.

[0164] The buffer part 2243 may include one first bending structure 2243a or a plurality of first bending structures 2243a. In an embodiment where the buffer part 2243 includes a plurality of first bending structures 2243a, the sequential connection of the plurality of first bending structures 2243a along the first direction X is advantageous for increasing the adjustment range of the distance between the base part 2241 and the connection part 2242, thereby enabling better accommodation of the expansion of the battery cell 2211.

[0165] One of the plurality of first bending structures 2243a among the plurality of first bending structures 2243a is connected to the base part 2241, and another first bending structure 2243a among the plurality of first bending structures 2243a is connected to the connection part 2242.

[0166] FIG. 27 shows the case where the buffer part 2243 includes one first bending structure 2243a. One end of the first bending part 22431 in the first bending structure 2243a that is away from the second bending part 22432 is connected to the base part 2241, and one end of the second bending part 22432 that is away from the first bending part 22431 is connected to the connection part 2242. The first bending part 22431 and the base part 2241 are provided to form an acute angle, and the second bending part 22432 and the connection part 2242 are provided to form an acute angle. The buffer part 2243, the base part 2241, and the connection part 2242 having one first bending structure 2243a form an M-shaped elastic member 224.

[0167] When the battery cell 2211 expands, the distance along the first direction X between the base 2241 and the connection portion 2242 becomes smaller, the angle between the first bend 22431 and the second bend 22432 becomes smaller, the angle between the base 2241 and the first bend 22431 becomes smaller, and the angle between the connection portion 2242 and the second bend 22432 becomes smaller.

[0168] The elastic member 224 may include one buffer portion 2243 or may include multiple buffer portions 2243. In an embodiment in which the elastic member 224 includes multiple buffer portions 2243, the multiple buffer portions 2243 are provided at intervals along the second direction Y, as shown in Figs. 24 to 27. Each buffer portion 2243 connects the base portion 2241 and the connecting portion 2242. The multiple buffer portions 2243 are commonly supported between the base portion 2241 and the connecting portion 2242, and thus can well accommodate changes in the distance between the base portion 2241 and the connecting portion 2242.

[0169] As shown in Figures 24 to 27, in an embodiment in which the elastic member 224 includes a plurality of buffer portions 2243, the elastic member 224 further includes a plurality of connecting portions 2242, one connecting portion 2242 is provided corresponding to each of the buffer portions 2243, and each of the connecting portions 2242 is connected to the base 2241 via one buffer portion 2243. The number of the buffer portions 2243 and the connecting portions 2242 may be multiple, making it easier to absorb the acting force due to the expansion and deformation of the battery cell 2211.

[0170] 24 to 27, the elastic member 224 includes two buffer parts 2243 and two connecting parts 2242, the two buffer parts 2243 are provided at an interval along the third direction Z, the two connecting parts 2242 are provided at an interval along the third direction Z, and the two buffer parts 2243 are respectively connected to both ends of the base part 2241 along the second direction Y. Specifically, the two buffer parts 2243 are respectively connected to two edges of the base part 2241 along the second direction Y. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0171] The number of the buffer parts 2243 and the number of the connection parts 2242 are each two, and the two buffer parts 2243 are spaced apart in the first direction X, so that the assembly space can be utilized efficiently.

[0172] As shown in FIGS. 24-27, in some embodiments, the base 2241 is provided with reinforcing ribs 22411, which makes the base 2241 stronger and less susceptible to damage.

[0173] The reinforcing rib 22411 may have a rib-like structure extending along the third direction Z. The number of reinforcing ribs 22411 may be one or more. In an embodiment in which the number of reinforcing ribs 22411 is more than one, the reinforcing ribs 22411 are provided at intervals along the second direction Y. FIGS. 24, 26, and 27 show a case in which the number of reinforcing ribs 22411 is four.

[0174] There are several methods for forming the elastic member 224, for example, the base 2241, the connecting portion 2242, and the buffer portion 2243 are independent parts from each other, and are integrally connected in the form of a removable connection or a fixed connection to form the elastic member 224. In another embodiment, the elastic member 224 may be integrally formed, for example, the base 2241, the buffer portion 2243, and the connecting portion 2242 are formed by bending a single plate material, so that the structure is simple, processing and manufacturing are easy, the connection between the base 2241 and the buffer portion 2243 is strong, and the connection between the buffer portion 2243 and the connecting portion 2242 is strong.

[0175] In some embodiments, the position regulating portion 23 may be the case lid 10, that is, along the first direction X, the base 2241 and the connection portion 2242 of the elastic member 224 abut against the buffer member 225 and the case lid 10, respectively, and the case lid 10 not only acts to regulate the elastic member 224 from moving along the first direction X, but also acts to seal the opening 212, thereby eliminating the need to provide a separate position regulating portion 23 for the battery module 20 and simplifying the structure of the battery module 20.

[0176] In another embodiment, the position regulating portion 23 and the case lid 10 may be two independent components, and the position regulating portion 23 is provided at one end of the case 21 where the opening 212 is located, thereby regulating the battery cell assembly 22, the cushioning member 225, and the elastic member 224 within the case 21 so that the case 21, the battery cell assembly 22, the cushioning member 225, and the elastic member 224 are an integrated structure, and after the case lid 10 is removed, the relative positional relationship of the battery cell assembly 22, the cushioning member 225, and the elastic member 224 is not affected, making it easy for the case lid 10 to be independently removed and independently attached.

[0177] As shown in Figures 2, 3, 22 and 23, in some embodiments, the position regulating portion 23 includes a first position regulating portion 231 and a second position regulating portion 232, and the first position regulating portion 231 and the second position regulating portion 232 are arranged at an interval in the second direction Y.

[0178] In some embodiments, the first position regulating portion 231 is connected to the first wall 213, the second position regulating portion 232 is connected to the second wall 214, and the connection portion 2242 is fixed to the first position regulating portion 231 and the second position regulating portion 232.

[0179] The first position restricting portion 231 and the second position restricting portion 232 are respectively connected to the first wall 213 and the second wall 214 provided opposite to each other along the second direction Y, thereby reducing the risk that the first position restricting portion 231 and the second position restricting portion 232 will interfere with other structures. The first position restricting portion 231 restricts the position of the elastic member 224 together with the second position restricting portion 232, thereby allowing the elastic member 224 to abut between the position restricting portion 23 and the buffer member 225 more stably.

[0180] The first position restriction portion 231 is connected to one end of the first wall 213 located at the opening 212 of the case 21. The first position restriction portion 231 protrudes from the inner surface of the first wall 213 in a direction approaching the second wall 214.

[0181] The first position restricting portion 231 and the first wall 213 can be provided separately and connected together. The connection between the first position restricting portion 231 and the first wall 213 may be a fixed connection such as a welding connection or an adhesive connection, which improves the connection stability between the first position restricting portion 231 and the first wall 213.

[0182] The connection between the first position regulating portion 231 and the first wall 213 may be a removable connection, such as a bolted connection, which facilitates maintenance and replacement of the first position regulating portion 231, and if either the first wall 213 or the first position regulating portion 231 is damaged, only the damaged one needs to be replaced, thereby saving costs.

[0183] In some embodiments, the first position restricting portion 231 and the first wall 213 can be integrally molded. The first position restricting portion 231 may be a flange structure provided at an end of the first wall 213, which makes it easy to manufacture and mold the first position restricting portion 231.

[0184] 2, 3, 22, and 23, second position restriction portion 232 is connected to one end of second wall 214 located at opening 212 of case 21. Second position restriction portion 232 protrudes from the inner surface of second wall 214 in a direction approaching first wall 213.

[0185] The second position restricting portion 232 and the second wall 214 can be provided separately and connected together. The connection between the second position restricting portion 232 and the second wall 214 may be a fixed connection such as a welding connection or an adhesive connection, which improves the connection stability between the second position restricting portion 232 and the second wall 214.

[0186] The connection between the second position regulating portion 232 and the second wall 214 may be a removable connection, such as a bolted connection, which facilitates maintenance and replacement of the second position regulating portion 232, and if either the second wall 214 or the second position regulating portion 232 is damaged, only the damaged one needs to be replaced, thereby saving costs.

[0187] In some embodiments, the second position restricting portion 232 and the second wall 214 can be integrally molded. The second position restricting portion 232 can be a flange structure provided at an end of the second wall 214, which makes it easier to manufacture and mold the second position restricting portion 232.

[0188] In some embodiments, along the second direction Y, the elastic member 224 includes two extensions 22421 of the connection that extend beyond both ends of the base 2241, and the two extensions 22421 are respectively connected to both ends of the base 2241 in the second direction Y.

[0189] The two extension portions 22421 are fixed to the first position restriction portion 231 and the second position restriction portion 232, respectively.

[0190] Two extension portions 22421 are connected to each connection portion 2242, one of which extends beyond one end of the base portion 2241 along the second direction Y, and the other of which extends beyond the other end of the base portion 2241 along the opposite direction Y' to the second direction Y.

[0191] When the battery cell 2211 expands, the overlapping portion of the base 2241 and the connection portion 2242 protrudes in a direction away from the battery cell assembly 22, and the two extension portions 22421 of the base 2241 abut against the first position regulating portion 231 and the second position regulating portion 232, respectively, thereby forming a cantilever structure, which not only prevents the elastic member 224 from coming off the first position regulating portion 231 and the second position regulating portion 232, but also accommodates the expansion of the battery cell 2211.

[0192] Therefore, since the extension portion 22421 is fixed to the first position control portion 231 and the second position control portion 232, when the battery cell 2211 expands, the connection portion 2242 can deform in a direction away from the battery cell assembly 22 to accommodate the expansion of the battery cell 2211, and can provide space for the deformation of the battery cell 2211.

[0193] In some embodiments, the position regulating portion 23 includes a third position regulating portion 233 and a fourth position regulating portion 234, and the third position regulating portion 233 and the fourth position regulating portion 234 are arranged at an interval along the third direction Z.

[0194] In some embodiments, the third position restricting portion 233 is connected to the third wall 215, and the fourth position restricting portion 234 is connected to the fourth wall 216. The connecting portion 2242 is fixed to the third position restricting portion 233 and the fourth position restricting portion 234.

[0195] The third position restricting portion 233 and the fourth position restricting portion 234 are fixed to the third wall 215 and the fourth wall 216, respectively, thereby reducing the risk of the third position restricting portion 233 and the fourth position restricting portion 234 interfering with other structures. The third position restricting portion 233, together with the fourth position restricting portion 234, restricts the battery cell assembly 22, the buffer member 225, and the elastic member 224 within the case 21, reducing the risk of the battery cell assembly 22, the buffer member 225, and the elastic member 224 coming off the case 21, allowing the elastic member 224 to abut more stably between the position restricting portion 23 and the buffer member 225.

[0196] In some embodiments, the third position restriction portion 233 is connected to one end of the third wall 215 located at the opening 212 of the case 21. The third position restriction portion 233 protrudes from the inner surface of the third wall 215 in a direction approaching the fourth wall 216.

[0197] The third position restricting portion 233 and the third wall 215 can be provided separately and connected together. The connection between the third position restricting portion 233 and the third wall 215 may be a fixed connection such as a welding connection or an adhesive connection, which improves the connection stability between the third position restricting portion 233 and the third wall 215.

[0198] The connection between the third position restricting portion 233 and the third wall 215 may be a removable connection, such as a bolt connection, which facilitates maintenance and replacement of the third position restricting portion 233, and when one of the third wall 215 and the third position restricting portion 233 is damaged, only the damaged one needs to be replaced, which can save costs. In another embodiment, the third position restricting portion 233 and the third wall 215 can be integrally molded. The third position restricting portion 233 may be a flange structure provided at the end of the third wall 215, which facilitates the manufacturing and molding of the third position restricting portion 233.

[0199] The number of third position regulating parts 233 may be one or more. In an embodiment in which the number of third position regulating parts 233 is more than one, the multiple third position regulating parts 233 are provided at intervals along the second direction Y. FIGS. 2, 3, 22, and 23 show the case in which there are two third position regulating parts 233.

[0200] In some embodiments, the fourth position restriction portion 234 is connected to one end of the fourth wall 216 located at the opening 212 of the case 21. The fourth position restriction portion 234 protrudes from the inner surface of the fourth wall 216 in a direction approaching the third wall 215.

[0201] The fourth position restricting portion 234 and the fourth wall 216 can be provided separately and connected together. The connection between the fourth position restricting portion 234 and the fourth wall 216 may be a fixed connection such as a welding connection or an adhesive connection, which improves the connection stability between the fourth position restricting portion 234 and the fourth wall 216.

[0202] The connection between the fourth position regulating portion 234 and the fourth wall 216 may be a removable connection, such as a bolted connection, which facilitates maintenance and replacement of the fourth position regulating portion 234, and if either the fourth wall 216 or the fourth position regulating portion 234 is damaged, only the damaged one needs to be replaced, thereby saving costs.

[0203] In some embodiments, the fourth position restricting portion 234 and the fourth wall 216 can be integrally molded. The fourth position restricting portion 234 can be a flange structure provided at an end of the fourth wall 216, which makes it easier to manufacture and mold the fourth position restricting portion 234.

[0204] The number of fourth position restriction portions 234 may be one or more. In an embodiment in which the number of fourth position restriction portions 234 is more than one, the multiple fourth position restriction portions 234 are provided at intervals along the second direction Y. FIGS. 2, 3, 22, and 23 show a case in which there are two fourth position restriction portions 234.

[0205] In some embodiments, the battery module 20 further includes a first insulating member 24 (shown in FIG. 2 ), which is disposed between the third wall 215 and the battery cell assembly 22 along the third direction Z. The first insulating member 24 can provide insulation between the third wall 215 and the battery cell assembly 22, and can also avoid friction between the battery cell assembly 22 and the third wall 215 to enhance the service life of the case 21. When viewed along the opposite direction to the third direction Z, the projection of the battery cell assembly 22 is within the projection of the first insulating member 24, so that when the battery cell assembly 22 expands, even if the battery cell assembly 22 further moves a certain distance into the case 21, the first insulating member 24 remains between the third wall 215 and the battery cell assembly 22.

[0206] An embodiment of the present invention further provides a power consuming device, which includes the battery pack 100 provided by any of the above embodiments.

[0207] The reliability of the battery pack 100 provided by any of the above embodiments is good, which is advantageous for improving the reliability of power consumption of the power consuming device powered by the battery module 20 and the battery pack 100.

[0208] The above is only a preferred embodiment of the present invention, and is not intended to limit the present application. For those skilled in the art, the present invention can be modified or changed in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention. [Explanation of symbols]

[0209] 100 battery packs, 10 Case lid, 10a input terminal, 10b output end, 20 battery modules, 21 cases, 211 Containment space, 212 aperture, 213 1st wall, 214 2nd wall, 215 Third wall, 2151 1st fixed part, 216 4th wall, 2161 Second fixed part, 217 5th wall, 22 Battery cell assembly, 221 Battery cell unit, 2211 Battery cell, 2211a first end surface, 2211b second end surface, 22111 Battery cell case, 22111a Main body, 22111b 1st sealing part, 22111c Second sealing part, 22112 Electrode Assembly, 22113 Electrode terminal, 2212 First holder, 22121 First covering part, 22122b 1st notch, 2213 Second holder, 22131 Second covering part, 222 first conductive member, 223 second conductive member, 224 Elastic members, 2241 base, 22411 Reinforcing rib, 2242 Connection, 22421 Extension; 2243 buffer section, 2243a First folding structure, 22431 First bending part, 22432 Second folding part, 225 Cushioning material, 2251 Part 1, 2252 Part 2, 2253 third part, 23 Position regulation section, 231 first position regulation portion, 232 second position regulation portion, 233 third position regulation part, 234 fourth position regulation part, 24 first insulating member, 30 circuit boards, X 1st direction, Y second direction, Y' opposite to the second direction, Z 3rd direction, Q1 Air gap.

Claims

1. A battery module including a battery cell assembly, an elastic member, and a cushioning member; The battery cell assembly includes a plurality of battery cell units stacked along a first direction, each of the battery cell units including a battery cell and a first holder; the battery cell includes a battery cell case, an electrode assembly, and an electrode terminal, the battery cell case includes a main body portion and a first sealing portion, and the electrode terminal protrudes from the battery cell case through the first sealing portion; the main body portion has a first end surface, and the first sealing portion is connected to the first end surface; the first holder includes a first covering portion, the first covering portion covering at least a portion of the first end surface, the elastic member is disposed along the first direction with respect to the battery cell assembly, the buffer member is provided between the elastic member and the battery cell assembly along the first direction, the buffer member includes a first portion, the first portion extends beyond a first end surface of the buffer member that is closer to the buffer member along a second direction, and the first direction and the second direction are perpendicular to each other; A battery module comprising:

2. The battery module according to claim 1 , wherein the first portion extends beyond a first covering portion closer to the buffer member along the second direction.

3. The battery module according to claim 1 , wherein the main body portion exceeds the first covering portion in the first direction.

4. The battery module according to claim 3 , wherein the first covering portion covers at least a portion of the first sealing portion.

5. The battery module according to claim 1 , wherein the main bodies of adjacent battery cells are in contact with each other.

6. The elastic member includes a base portion, a connection portion, and at least one buffer portion, the base portion and the connection portion being spaced apart from each other along the first direction, The battery module according to claim 1 , wherein the base is connected to the buffer member, and the base exceeds the first portion along the second direction.

7. 7. The battery module according to claim 6, wherein the buffer portion includes a first folding structure, the first folding structure includes a first folding portion and a second folding portion that are connected together, and the first folding portion and the second folding portion are arranged to form an angle.

8. The battery module according to claim 6 , wherein a portion of the first sealing portion is separated from the first covering portion, and a gap is formed between the first sealing portion and the base portion.

9. The battery module according to claim 6 , wherein the buffer portion is arranged to provide a space for expansion of the battery cells.

10. the battery module further includes a case, the connection portion being fixed to the case; The battery module according to claim 6 , wherein the battery cell assembly, the elastic member, and the cushioning member are all housed within the case.

11. 7. The battery module of claim 6, wherein the cushioning member includes a second portion, the first portion extends from the second portion, and a projection of the second portion and a projection of the main body portion have an overlapping portion along the first direction.

12. The battery module according to claim 6 , wherein the first holder is integrally formed with the battery cell.

13. A battery pack comprising: The battery module according to any one of claims 1 to 5. a case lid connected to the battery module; A battery pack comprising:

14. 1. A power consuming device, comprising:

14. A power consuming device comprising at least one battery pack according to claim 13.

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