Shell assembly of battery, battery monomer and battery pack with battery monomer

Abstract

The utility model discloses a shell assembly of a battery, a battery monomer and a battery pack with the battery monomer, the shell assembly of the battery comprises: a shell body, the shell body comprises a first shell and a second shell, the first shell defines a first cavity for placing a pole group, and the second shell defines a second cavity for placing a pole group; the second shell is located on the outer side of the first shell and defines a second cavity together with the first shell, and at least one end of the first cavity and at least one end of the second cavity in the length direction of the shell body are open; the cover plate is arranged at the open end, in the length direction, of the shell body and used for blocking the first cavity and the second cavity; the cover plate is provided with the connector, the connector is provided with a first connector and a second connector, the first connector is communicated with the second cavity, and the second connector is located on the outer side of the cover plate. According to the shell assembly of the battery, the structure is simple, the volume utilization rate of the battery monomer can be improved, the heat exchange area of a cooling medium and the battery monomer is increased, the heat exchange efficiency is improved, the temperature rise rate is reduced, and the safety and the reliability of the battery monomer are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell component, a battery monomer and a battery pack having the same. Background Art

[0002] As environmental and energy issues become increasingly serious, people pay more and more attention to the research and development and production of electric vehicles. The popularity of new energy electric vehicles has greatly increased, but due to the shortage of charging supporting infrastructure, charging anxiety has become a prominent problem. In order to solve the problem of charging anxiety, people often increase the fast charging rate of the battery cell. Therefore, the temperature rise control problem under fast charging has become a bottleneck problem restricting the development of fast charging. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery shell assembly, which can improve the volume utilization rate of the battery cell, increase the heat exchange area, improve the heat exchange efficiency, reduce the temperature rise rate, and improve the safety and reliability of the battery cell.

[0004] The utility model also provides a battery cell, which includes the battery shell assembly mentioned above.

[0005] The utility model also provides a battery pack, which includes the above-mentioned battery monomer.

[0006] The shell assembly of the battery according to the embodiment of the utility model includes: a shell body, the shell body includes a first shell and a second shell, the first shell defines a first cavity for placing a pole group, the second shell is located on the outside of the first shell and defines a second cavity together with the first shell, the first cavity and the second cavity are open at least at one end along the length direction of the shell body; a cover plate, the open end of the shell body in the length direction is provided with the cover plate, which is used to block the first cavity and the second cavity; a connector, the cover plate is provided on the cover plate, the connector has a first interface and a second interface, the first interface is connected to the second cavity, and the second interface is located on the outside of the cover plate.

[0007] According to the battery shell assembly of the embodiment of the utility model, a second cavity is provided on the outside of the first cavity, and the cooling medium flows in the second cavity and exchanges heat with the internal structure of the battery cell. The structure is simple, and the volume utilization rate of the battery cell can be improved, the heat exchange area between the cooling medium and the battery cell is increased, the heat exchange efficiency is improved, the temperature rise rate of the battery cell is reduced, and the safety and reliability of the battery cell are improved.

[0008] In addition, the battery housing assembly according to the utility model may also have the following additional technical features:

[0009] In some embodiments, the open ends of the inner wall surfaces of the first shell and the second shell along the length direction of the shell body have grooves, the side of the groove close to the cover plate is open, and the side of the cover plate facing the shell body has a protrusion that cooperates with the groove.

[0010] In some embodiments, the second shell extends along the circumferential direction of the first shell, and a plurality of partitions spaced apart along the circumferential direction of the second cavity are provided in the second cavity. The plurality of partitions are used to divide the second cavity into a plurality of sub-cavities spaced apart along the circumferential direction of the first shell, and each of the sub-cavities is open at least at one end along the length direction of the shell body.

[0011] In some embodiments, along the length direction of the shell body, one end of the partition facing the cover plate is retracted into the wall surface of the groove away from the cover plate.

[0012] In some embodiments, both ends of the first cavity and the second cavity along the length direction of the shell body are open, and each of the cover plates is provided with a joint, and one of the two joints is rotated 180° in a plane perpendicular to the length direction of the shell body to have the same position and angle as the other joint.

[0013] In some embodiments, the first cavity and the second cavity are open at one end along the length direction of the shell body, and two joints are provided on the cover plate, which are respectively provided at both ends of the cover plate along the thickness direction of the shell body and are both connected to the second cavity.

[0014] The utility model also provides a battery cell having the above embodiment.

[0015] According to the battery cell of the embodiment of the utility model, by providing the above-mentioned battery shell assembly, by providing a second cavity outside the first cavity, the cooling medium flows in the second cavity and exchanges heat with the internal structure of the battery cell. The structure is simple, and the volume utilization rate of the battery cell can be improved, the heat exchange area between the cooling medium and the battery cell is increased, the heat exchange efficiency is improved, the temperature rise rate of the battery cell is reduced, and the safety and reliability of the battery cell are improved.

[0016] The battery pack according to the embodiment of the present invention includes: a battery module, the battery module includes a plurality of battery cells, and the battery cells are the above-mentioned battery cells.

[0017] According to the battery pack of the embodiment of the utility model, by providing the above-mentioned battery cell and providing a second cavity outside the first cavity, the cooling medium flows in the second cavity and exchanges heat with the internal structure of the battery cell. The structure is simple, and the volume utilization rate of the battery cell can be improved, the heat exchange area between the cooling medium and the battery cell can be increased, the heat exchange efficiency can be improved, the temperature rise rate of the battery cell can be reduced, and the safety and reliability of the battery cell can be improved.

[0018] In addition, the battery pack according to the utility model may also have the following additional technical features:

[0019] In some embodiments, at least part of the battery cells are arranged in sequence along the thickness direction of the shell body, and the surfaces close to each other in two adjacent battery cells form at least part of the second shell of each other, and a plurality of fins arranged at intervals along the width direction of the shell body are provided between the first shells of two adjacent battery cells, and the fins include a first fin and a second fin, the first fin is provided at both ends of the second cavity along the width direction of the shell body, and the two ends of the first fin along the thickness direction of the shell body are respectively connected to the first shells of the two adjacent battery cells, the second fin is located between the two first fins, and one end of the second fin along the thickness direction of the shell body is connected to one of the two adjacent battery cells; or, the second shell of each battery cell is independently provided.

[0020] In some embodiments, at least part of the battery cells are arranged in sequence along the thickness direction of the shell body, and at least part of the connectors also have a third interface, and the third interface is located on the outside of the cover plate, and the second interface and the third interface are respectively facing the two sides of the thickness direction of the shell body, and the second interface and the third interface of the middle one of the three adjacent battery cells are respectively connected to the third interface and the second interface of the two battery cells on both sides, and one end of the second interface and the third interface facing the adjacent battery cell does not exceed the central axis of the adjacent battery cell in the thickness direction.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a three-dimensional diagram of a battery housing assembly according to a first embodiment of the utility model;

[0024] Figure 2 is an exploded view of a battery housing assembly according to a first embodiment of the utility model;

[0025] Figure 3 It is a rear view of the cover plate and the connector of the battery housing assembly according to the first embodiment of the utility model;

[0026] Figure 4 It is a front view of the shell body of the shell assembly of the battery according to the first embodiment of the utility model;

[0027] Figure 5 is a three-dimensional view of a shell body of a battery shell assembly according to a first embodiment of the utility model;

[0028] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0029] Figure 7 It is a right side view of the housing assembly of the battery according to the first embodiment of the utility model;

[0030] Figure 8 is along Figure 7 Sectional view along the midline BB;

[0031] Fig. 9 is a top view of a battery cell according to a first embodiment of the utility model;

[0032] Fig.10 is a three-dimensional diagram of a battery pack according to an embodiment of the utility model;

[0033] Fig.11 is a top view of a battery pack according to an embodiment of the utility model, wherein only the cover plate and the connector at one end of the battery housing assembly in the length direction are shown;

[0034] Fig.12 is a schematic structural diagram of a shell body of a battery shell assembly according to a second embodiment of the utility model;

[0035] Fig.13 It is a schematic structural diagram of a shell body of a battery shell assembly according to a third embodiment of the utility model.

[0036] Reference numerals:

[0037] 1000, battery pack;

[0038] 100. Battery cell;

[0039] 10. Shell assembly;

[0040] 1. Shell body; 11. First shell; 111. First cavity; 112. Groove; 12. Second shell; 121. Second cavity; 122. Partition; 13. Fin; 131. First fin; 132. Second fin;

[0041] 2. Cover plate; 21. Protrusion;

[0042] 3. Connector; 31. First interface; 32. Second interface; 33. Third interface. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The housing assembly 10 of a battery according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0048] like Figure 1 As shown, the housing assembly 10 of the battery according to the embodiment of the present utility model includes a housing body 1 , a cover plate 2 and a connector 3 .

[0049] Specifically, refer to the attached Figure 2 and attached Figure 4 As shown, the shell body 1 includes a first shell 11 and a second shell 12. The first shell 11 defines a first cavity 111 for placing and protecting the electrode group. The second shell 12 is located outside the first shell 11 and defines a second cavity 121 together with the first shell 11. The first cavity 111 and the second cavity 121 are connected along the length direction of the shell body 1 (see Appendix 1). Figure 2 The first cavity 111 and the second cavity 121 extend in at least one end along the length direction of the shell body 1, and are open.

[0050] Further, see Attachment Figure 7 As shown, the open end of the shell body 1 in the length direction is provided with a cover plate 2 for sealing the first cavity 111 and the second cavity 121. Figure 7 As shown, a joint 3 is provided on the cover plate 2, and the joint 3 has a first interface 31 and a second interface 32. The first interface 31 is connected to the second cavity 121, and the second interface 32 is located on the outside of the cover plate 2. The setting of the joint 3 allows the cooling medium to flow into the second cavity 121 or flow out of the second cavity 121.

[0051] It is understandable that, referring to the Figure 2 and attached Figure 8 As shown, both ends of the first cavity 111 and the second cavity 121 along the length direction of the shell body 1 are open, and each cover plate 2 is provided with a joint 3. The cooling medium flows into the joint 3 from the second interface 32 at one end of the shell body 1 in the length direction, and flows into the second cavity 121 through the first interface 31. The cooling medium exchanges heat with the internal structure of the shell assembly 10 and flows to the other end along the length direction of the shell body 1, and then flows out of the second cavity 121 from the first interface 31 at the other end of the shell body 1 in the length direction, and finally flows out of the shell assembly 10 through the second interface 32.

[0052] Of course, the utility model is not limited to this. The first cavity 111 and the second cavity 121 may be open at one end along the length direction of the shell body 1, and two joints 3 are provided on the cover plate 2. The cooling medium flows into one joint 3 from the second interface 32 at the open end of the shell body 1 in the length direction of the shell body 1, and flows into the second cavity 121 through the first interface 31. The cooling medium exchanges heat with the internal structure of the shell assembly 10 and flows to the other joint 3 along the circumferential direction of the shell body 1, flows out of the second cavity 121 through the first interface 31, and finally flows out of the shell assembly 10 through the second interface 32.

[0053] It can be understood that by providing a second cavity 121 outside the first cavity 111, the cooling medium flows in the second cavity 121 and exchanges heat with the internal structure of the battery cell 100. The structure is simple, and the volume utilization of the battery cell 100 can be improved, the heat exchange area between the cooling medium and the battery cell 100 can be increased, the heat exchange efficiency can be improved, the temperature rise rate of the battery cell 100 can be reduced, and the safety and reliability of the battery cell 100 can be improved.

[0054] According to the battery shell assembly 10 of the embodiment of the utility model, a second cavity 121 is provided on the outside of the first cavity 111, and the cooling medium flows in the second cavity 121 and exchanges heat with the internal structure of the battery cell 100. The structure is simple, and the volume utilization rate of the battery cell 100 can be improved, the heat exchange area between the cooling medium and the battery cell 100 is increased, the heat exchange efficiency is improved, the temperature rise rate of the battery cell 100 is reduced, and the safety and reliability of the battery cell 100 are improved.

[0055] In some embodiments of the present invention, refer to the attached Figure 6 As shown, the open end of the inner wall surface of the first shell 11 and the second shell 12 along the length direction of the shell body 1 has a groove 112, and the groove 112 extends in a ring shape along the circumferential direction of the shell body 1. The side of the groove 112 close to the cover plate 2 is open, and the side of the cover plate 2 facing the shell body 1 has a protrusion 21 that cooperates with the groove 112. The protrusion 21 extends in a ring shape along the circumferential direction of the cover plate 2. The cooperation between the protrusion 21 and the groove 112 can play a positioning role, which is convenient for the assembly of the cover plate 2 and the shell body 1. It can be understood that, referring to the attached Figure 3 As shown, the protrusion 21 forms a "U"-shaped structure. The protrusion 21 cooperates with the groove 112 of the first shell 11 to prevent the electrolyte from overflowing from the first cavity 111, and the protrusion 21 cooperates with the groove 112 of the second shell 12 to prevent the cooling medium from overflowing from the second cavity 121, thereby ensuring the sealing effect of the battery shell assembly 10.

[0056] In a further embodiment of the present invention, refer to the attached Figure 4 and attached Figure 5As shown, the second shell 12 extends in a ring shape along the circumferential direction of the first shell 11, and a plurality of partitions 122 spaced apart along the circumferential direction of the second cavity 121 are provided in the second cavity 121. In a length direction perpendicular to the shell body 1, the plurality of partitions 122 extend along the radial direction of the second cavity 121, and the two ends of the extension direction are respectively connected to the outer circumferential wall of the first shell 11 and the inner circumferential wall of the second shell 12. The plurality of partitions 122 are used to divide the second cavity 121 into a plurality of sub-cavities spaced apart along the circumferential direction of the first shell 11, and each sub-cavity is open at least at one end along the length direction of the shell body 1. The arrangement of the plurality of sub-cavities can well ensure the directional flow of the cooling medium, ensure the heat exchange effect between the cooling medium and the internal structure of the battery cell 100, and further reduce the temperature rise rate of the battery cell 100.

[0057] In a further embodiment of the present invention, refer to the attached Figure 6 As shown, along the length direction of the shell body 1, one end of the partition 122 facing the cover plate 2 is retracted into the wall of the groove 112 away from the cover plate 2 to ensure that the ends of the multiple sub-cavities close to the cover plate 2 are connected, so as to facilitate the cooling medium to flow from the joint 3 into the multiple sub-cavities or out of the multiple sub-cavities respectively.

[0058] In a further embodiment of the present invention, refer to the attached Fig. 9 As shown, the first cavity 111 and the second cavity 121 are open at both ends along the length direction of the shell body 1, and each cover plate 2 is provided with a joint 3. One of the two joints 3 is rotated 180° in a plane perpendicular to the length direction of the shell body 1 to have the same position and angle as the other joint 3, which can facilitate the production and processing of the battery shell assembly 10 and the layout of the battery pack 1000.

[0059] In a further embodiment of the present invention, the first cavity 111 and the second cavity 121 are open at one end along the length direction of the shell body 1, and the cover plate 2 is provided with two joints 3, which are respectively provided at the cover plate 2 along the thickness direction of the shell body 1 (see attached Fig.11 Both ends of the battery casing 10 (in the direction d shown) are connected to the second cavity 121, which can facilitate the production and processing of the battery shell assembly 10 and the layout of the battery pack 1000.

[0060] The present invention further provides a battery cell 100 having the battery housing assembly 10 of the above embodiment.

[0061] According to the battery cell 100 of the embodiment of the utility model, by providing the above-mentioned battery shell assembly 10, by providing the second cavity 121 outside the first cavity 111, the cooling medium flows in the second cavity 121 and exchanges heat with the internal structure of the battery cell 100. The structure is simple, and the volume utilization rate of the battery cell 100 can be improved, the heat exchange area between the cooling medium and the battery cell 100 is increased, the heat exchange efficiency is improved, the temperature rise rate of the battery cell 100 is reduced, and the safety and reliability of the battery cell 100 are improved.

[0062] The present invention further provides a battery pack 1000 having the battery cell 100 of the above embodiment.

[0063] like Fig.10 and attached Fig.11 As shown, the battery pack 1000 according to the embodiment of the utility model includes a battery module, and the battery module includes a plurality of battery cells 100. The battery cells 100 are the above-mentioned battery cells 100, which can ensure the energy storage density of the battery pack 1000 and the storage capacity of the battery pack 1000. In a specific example, referring to the attached Fig.10 and attached Fig.11 As shown, the battery pack 1000 is provided with two battery modules spaced apart along the length direction of the shell body 1, and each battery module includes a plurality of battery modules spaced apart along the thickness direction of the shell body 1 (see attached Fig.11 The battery cells 100 are arranged in the direction d as shown.

[0064] According to the battery pack 1000 of the embodiment of the utility model, by providing the above-mentioned battery cell 100, by providing the second cavity 121 outside the first cavity 111, the cooling medium flows in the second cavity 121 and exchanges heat with the internal structure of the battery cell 100. The structure is simple, and the volume utilization rate of the battery cell 100 can be improved, the heat exchange area between the cooling medium and the battery cell 100 is increased, the heat exchange efficiency is improved, the temperature rise rate of the battery cell 100 is reduced, and the safety and reliability of the battery cell 100 are improved.

[0065] In some embodiments of the present invention, refer to the attached Fig.13 As shown, at least some of the battery cells 100 are arranged in sequence along the thickness direction of the shell body 1, and the surfaces of two adjacent battery cells 100 close to each other form at least part of the second shell 12 of each other, and there is a gap between the first shells 11 of the two adjacent battery cells 100 along the width direction of the shell body 1 (see attached Fig.13The fins 13 include a first fin 131 and a second fin 132. The first fin 131 is disposed at both ends of the second cavity 121 along the width direction of the shell body 1. Both ends of the first fin 131 along the thickness direction of the shell body 1 are respectively connected to the first shells 11 of two adjacent battery cells 100 by laser welding to form a closed second cavity 121, thereby ensuring the sealing of the second cavity 121.

[0066] Further, see Attachment Fig.13 As shown, the second fin 132 is located between the two first fins 131, which can increase the contact area between the cooling medium and the shell assembly 10 and improve the heat exchange efficiency. One end of the second fin 132 along the thickness direction of the shell body 1 is connected to one of the two adjacent battery cells 100, which can facilitate the flow of the cooling medium.

[0067] It should be noted that the second shells 12 may be independently provided at both ends of the shell body 1 in the width direction, so as to fully utilize the space in the battery pack 1000 and improve the heat exchange efficiency of the battery cell 100 .

[0068] In some embodiments of the present invention, refer to the attached Figure 4 and attached Fig.12 As shown, the second shell 12 of each battery cell 100 is independently provided, which can facilitate the production and processing of the battery cell 100 and simplify the assembly process of the battery pack 1000 .

[0069] In some embodiments of the present invention, refer to the attached Fig. 9 and attached Fig.10 As shown, at least part of the battery cells 100 are arranged in sequence along the thickness direction of the shell body 1, and at least part of the connector 3 also has a third interface 33, the third interface 33 is located on the outside of the cover plate 2, the second interface 32 and the third interface 33 are respectively facing the two sides in the thickness direction of the shell body 1, and the second interface 32 and the third interface 33 of the middle one of the three adjacent battery cells 100 are respectively connected to the third interface 33 and the second interface 32 of the two battery cells 100 on both sides, and the second interface 32 of the battery cell 100 is used to receive the cooling medium transmitted from the third interface 33 of the previous battery cell 100, and the third interface 33 is used to transmit part of the received cooling medium to the second interface 32 of the next battery cell 100.

[0070] Further, see Attachment Fig. 9 As shown, the ends of the second interface 32 and the third interface 33 facing the adjacent battery cell 100 do not exceed the thickness direction of the adjacent battery cell 100 (see the attached Fig. 9The central axis of the battery pack 1000 (in the direction d shown) can facilitate the arrangement of the battery pack 1000 and avoid mutual interference between two adjacent battery cells 100, which affects the normal flow of the cooling medium. It should be noted that the second interface 32 and the third interface 33 of two adjacent battery cells 100 are connected by a hose to ensure the normal flow of the cooling medium.

[0071] It should be noted that when assembling the battery pack 1000 , the battery housing assembly 10 is first sealed to ensure the sealing of the battery cells 100 , and then the connectors 3 between the multiple battery cells 100 are installed and connected.

[0072] In other embodiments of the present invention, the length direction of the battery cell 100 (see attached Figure 2 The two ends of the connector 3 in the c direction are respectively the first end and the second end. When the connector 3 does not have the third interface 33, the cooling medium flows into the connector 3 from the second interface 32 of the first end, flows into the second cavity 121 through the first interface 31, and then flows out of the second cavity 121 from the first interface 31 of the second end, and then flows into the connector 3 through the second interface 32 of the second end of the adjacent battery cell 100, flows into the second cavity 121 through the first interface 31, and flows out of the second cavity 121 from the first interface 31 of the first end of the adjacent battery cell 100, forming an "S"-shaped flow path, ensuring the normal flow of the cooling medium, and avoiding the cooling medium in the second cavity 121 from being stationary and not participating in the circulation due to flow resistance problems.

[0073] The other structures and operations of the battery housing assembly 10 , the battery cell 100 and the battery pack 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery housing assembly, characterized in that: include: A shell body, the shell body comprising a first shell and a second shell, the first shell defining a first cavity for placing a pole group, the second shell being located outside the first shell and defining a second cavity together with the first shell, the first cavity and the second cavity being open at at least one end along the length direction of the shell body; A cover plate, which is provided at the open end of the shell body in the length direction and is used to seal the first cavity and the second cavity; A connector is provided on the cover plate, and the connector has a first interface and a second interface, the first interface is connected to the second cavity, and the second interface is located outside the cover plate.

2. The battery housing assembly according to claim 1, characterized in that: The open ends of the inner wall surfaces of the first shell and the second shell along the length direction of the shell body have grooves, the side of the groove close to the cover plate is open, and the side of the cover plate facing the shell body has a protrusion that matches the groove.

3. The battery housing assembly according to claim 2, characterized in that: The second shell extends along the circumferential direction of the first shell, and a plurality of partitions spaced apart along the circumferential direction of the second cavity are provided in the second cavity. The plurality of partitions are used to divide the second cavity into a plurality of sub-cavities spaced apart along the circumferential direction of the first shell, and each of the sub-cavities is open at least at one end along the length direction of the shell body.

4. The battery housing assembly according to claim 3, characterized in that: Along the length direction of the shell body, one end of the partition plate facing the cover plate is retracted into the wall surface of the groove away from the cover plate.

5. The battery housing assembly according to claim 1, characterized in that: The first cavity and the second cavity are open at both ends along the length direction of the shell body, and each cover plate is provided with a joint. One of the two joints is rotated 180° in a plane perpendicular to the length direction of the shell body to have the same position and angle as the other joint.

6. The battery housing assembly according to claim 1, characterized in that: The first cavity and the second cavity are open at one end along the length direction of the shell body, and the cover plate is provided with two joints, which are respectively arranged at two ends of the cover plate along the thickness direction of the shell body and are both connected to the second cavity.

7. A battery cell, characterized in that: A housing assembly comprising a battery according to any one of claims 1-6.

8. A battery pack, characterized in that: include: A battery module, comprising a plurality of battery cells, wherein the battery cells are the battery cells according to claim 7.

9. The battery pack according to claim 8, characterized in that: At least part of the battery cells are arranged in sequence along the thickness direction of the shell body, and the surfaces of two adjacent battery cells close to each other form at least part of the second shell of each other. A plurality of fins are provided between the first shells of two adjacent battery cells and are spaced apart along the width direction of the shell body, the fins comprising a first fin and a second fin, the first fin being provided at both ends of the second cavity along the width direction of the shell body, the two ends of the first fin along the thickness direction of the shell body being respectively connected to the first shells of the two adjacent battery cells, the second fin being located between the two first fins, and one end of the second fin along the thickness direction of the shell body being connected to one of the two adjacent battery cells; Alternatively, the second shell of each of the battery cells is independently provided.

10. The battery pack according to claim 8, characterized in that: At least some of the battery cells are arranged in sequence along the thickness direction of the shell body, at least some of the connectors also have a third interface, the third interface is located on the outside of the cover plate, the second interface and the third interface are respectively facing the two sides in the thickness direction of the shell body, the second interface and the third interface of the middle one of the three adjacent battery cells are respectively connected to the third interface and the second interface of the two battery cells on both sides, One end of the second interface and the third interface facing the adjacent battery cell does not exceed the center axis of the adjacent battery cell in the thickness direction.

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