CN219286546U - A battery assembly and battery pack - Google Patents

Abstract

The utility model discloses a battery assembly and a battery pack, comprising: a battery module, the battery module includes a plurality of battery cells arranged in sequence; A first shell and a second shell, the first shell includes a first shell and a first heat sink, the second shell includes a second shell and a second heat sink, the first heat sink and the second heat sink The sheets form a plurality of housing compartments for housing the battery cells. The first cooling fin and the second cooling fin that are arranged oppositely form a storage compartment for accommodating the battery cell. While fixing the battery cell, the heat of the battery can be absorbed through the cooling fin to realize rapid heat dissipation of the battery module; through the cooling fin and the The casing is combined to form a casing, which is convenient for modular installation, has strong flexibility, high expandability, and is easier to realize high-speed automation.

Description

A battery assembly and battery pack

technical field

The utility model generally relates to the technical field of batteries, in particular to a battery assembly and a battery pack.

Background technique

As a green and environmentally friendly new energy source, secondary ion batteries have the advantages of good reliability, high safety, small size, light weight, etc., and are widely used in electronic products, electric vehicles, military products and other fields. Cylindrical batteries are popular because of their winding processing, simple structure, and high production efficiency.

At present, the assembly of cylindrical batteries is relatively complicated, with a low degree of automation and high labor costs. In the current existing battery packs, it is usually necessary to assemble multiple battery cells into a battery module, which can generally be four, eight or sixteen, etc. After the battery cells form a battery module, there will be The phenomenon of uneven heat and temperature distribution, if the heat is not discharged in time, will lead to the decline of battery performance, which will directly affect the use effect and life of the battery.

Utility model content

In view of the above defects or deficiencies in the prior art, it is desired to provide a battery assembly and a battery pack, which can be easily installed and improve the heat dissipation effect of the battery module.

In a first aspect, the present application provides a battery assembly, comprising:

A battery module, the battery module including a plurality of battery cells arranged in sequence;

The casing, the casing includes a first casing and a second casing respectively arranged on both sides of the battery module, the first casing includes a first casing and a first heat sink, and the second casing includes a second casing and the second cooling fins, the first cooling fins and the second cooling fins form a plurality of accommodation chambers for accommodating the battery cells.

Optionally, the battery cell includes an end surface and a side surface, and a pole is provided on the end surface; the accommodating chamber is in contact with the side surface of the battery cell; the first casing and the second casing cover The end face of the battery cell is provided with a port at a position corresponding to the end face, and the pole of the battery cell is exposed from or passes through the port.

Optionally, the end face includes a first end face and a second end face, the first heat sink and the second heat sink are provided with a first boundary toward the first end face, the first heat sink and the second heat sink The sheet is provided with a second boundary in the direction of the second end surface, there is a distance between the first boundary and the first end surface in the height direction of the battery cell, and the second boundary and the second end surface are in the height direction of the battery cell There is a distance in the height direction of .

Optionally, the battery cell is fixedly arranged on the receiving compartment by a heat-conducting structural adhesive.

Optionally, also include:

The connecting piece arranged on the end face of the battery cell, the connecting piece is used to realize the electrical connection of different battery cells, the connecting piece is arranged outside the casing, and the poles of the battery cell A column is connected to the connector.

Optionally, the connecting member includes a first connecting member, and the first connecting member is used to connect pole posts of two adjacent battery cells in the battery module.

Optionally, the connecting piece includes a second connecting piece, and the second connecting piece includes a first connecting portion fixedly connected to a pole of one battery cell and a second connecting portion perpendicular to the first connecting portion. The connecting part, the second connecting part is provided with connecting terminals for realizing external electrical connection.

Optionally, the first heat sink includes a first surface and a second surface oppositely arranged, the first surface is provided with heat dissipation fins, and the second surface is provided with a plurality of receiving grooves, and the heat dissipation The heat dissipation pad is attached to the second surface of the receiving groove facing the battery cell, and the heat dissipation pad includes a plurality of receiving grooves arranged in an array, and the receiving grooves on the first heat sink are used to communicate with The accommodation slots at corresponding positions on the second heat sink cooperate to form the accommodation chamber.

Optionally, both the first heat dissipation fin and the second heat dissipation fin include a heat dissipation substrate, and the heat dissipation substrate is continuously bent multiple times to form the plurality of receiving grooves.

Optionally, the battery cell is fixedly arranged on the receiving groove by a heat-conducting structural adhesive.

Optionally, the first housing and the first cooling fins, the second housing and the second cooling fins are all integral structures, and the first cooling fins and the second cooling fins are made of metal Material, the first casing and the second casing are made of plastic.

Optionally, the first housing is provided with a first heat dissipation port, the second housing is provided with a second heat dissipation port, the first heat dissipation port at least completely exposes the first heat sink, and the second The heat dissipation opening at least fully exposes the second heat dissipation fin.

In a second aspect, the present application provides a battery pack, including the battery assembly as described above.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

The battery assembly and the battery pack provided by the embodiment of the utility model form a storage compartment for accommodating the battery cell through the first heat sink and the second heat sink arranged oppositely, and can absorb the heat of the battery through the heat sink while fixing the battery cell , to achieve rapid heat dissipation of the battery module; the shell is formed by combining the heat sink and the shell, which is convenient for modular installation, has strong flexibility, high expandability, and is easier to realize high-speed automation.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a schematic structural view of a battery assembly provided by an embodiment of the present invention;

Fig. 2 is an exploded schematic diagram of a battery assembly provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a battery cell provided by an embodiment of the present invention;

Figure 4-5 is a schematic structural diagram of a first shell/second shell provided by an embodiment of the present invention;

6-7 are schematic structural views of a first housing/second housing provided by an embodiment of the present invention;

Figures 8-10 are schematic structural views of a first heat sink/second heat sink provided by an embodiment of the present invention;

Fig. 11 is a schematic structural diagram of a battery assembly provided by an embodiment of the present invention.

In the figure,

1000. Battery components;

100. Battery module; 200. Shell; 300. Connector; 400. Box body;

10. A battery cell; 101. A first battery cell; 102. A second battery cell;

110, end face; 120, side face;

20, pole; 201, first pole; 202, second pole;

30. The first shell; 40. The second shell; 50. The storage bin; 60. The first heat dissipation port; 70. The second heat dissipation port;

301, the first shell; 302, the first heat sink; 310, the first surface; 320, the second surface;

311, heat dissipation fins; 321, heat dissipation substrate;

401, the second shell; 402, the second heat sink;

410, main body; 411, top frame; 412, bottom frame; 413, side frame;

501, receiving slot; 502, frame; 503, port;

601, the first connecting piece; 602, the second connecting piece;

610, the first output pole; 620, the second output pole;

621, the first connection part; 622, the second connection part; 623, the connection terminal.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Please refer to Figure 1-2 for details. This application provides a battery assembly 1000, including:

A battery module 100, the battery module 100 includes a plurality of battery cells 10 arranged in sequence;

The casing 200, the casing 200 includes a first casing 30 and a second casing 40 respectively arranged on both sides of the battery module 100, the first casing 30 includes a first casing 301 and a first cooling fin 302, the The second housing 40 includes a second shell 401 and a second heat sink 402 , the first heat sink 302 and the second heat sink 402 form a plurality of storage chambers 50 for containing the battery cells 10 .

The battery assembly 1000 provided in the embodiment of the present application forms a storage compartment 50 for accommodating the battery cell 10 through the first heat sink 302 and the second heat sink 402 arranged oppositely, and can absorb the battery cell 10 through the heat sink while fixing the battery cell 10. The heat of the battery realizes rapid heat dissipation of the battery module 100; the casing 200 is formed by combining the heat sink and the casing, which is convenient for modular installation, has strong flexibility, high expandability, and is easier to realize high-speed automation.

In this application, the number of battery cells 10 on the battery module 100 may be multiple, and the number of connectors 300 on the battery module 100 may be one or more. For example, the battery module 100 includes eight batteries arranged in an array Monomer 10. At the same time, the shape of the battery cell 10 is not limited. The battery cell 10 can be a square battery or a cylindrical battery, and the shape of the storage bin 50 is adapted to the shape of the battery cell 10 . Cylindrical cells are exemplarily described in this application.

3 shows a structure of a battery cell 10, the battery cell 10 includes an end surface 110 and a side surface 120, the end surface 110 is arranged at both ends of the side surface 120, and the battery cell 10 is Pole posts 20 are disposed on the two end surfaces 110 . In this embodiment, the accommodating chamber 50 is in contact with the side surface 120 of the battery cell 10; There is a port 503 for electrical connection of the pole 20 with the outside.

In the embodiment of the present application, the cooling fins are arranged on both sides of the side surface 120 of the battery cell 10, and the storage bin 50 provided on the cooling fin contacts the side surface 120 of the battery cell 10 to dissipate heat, so that the problem of heat dissipation on a curved surface is solved. , high cooling efficiency.

In the embodiment of the present application, as shown in FIGS. 4-5 , the first housing 301 and the second housing 401 have the same structure, both including a main body 410 and a The main body 410 is a vertical frame body, the main body 410 is arranged in a direction parallel to the axis of the battery cell 10 , the frame body includes a top frame 411 and a bottom frame 412 corresponding to the end surface 110 of the battery cell 10 , Two side frames 413 are arranged along the radial direction of the battery cell 10 . The port 503 is arranged on the top frame 411 and the bottom frame 412. The application does not limit the shape of the port 503. The port 503 can be semicircular. When the first shell 30 and the second When the shells 40 are in contact, the port 503 on the first shell 30 and the port 503 on the second shell 40 combine to form a circular opening for the pole 20 to pass through.

The main body 410 on the first housing 30 is arranged on the side of the first cooling fin 302 away from the storage compartment 50 , and the main body 410 on the second housing 40 is arranged on the side of the second cooling fin 402 away from the storage compartment 50 . One side of the storage bin 50 described above.

Optionally, as shown in FIGS. 6-7 , the first housing 30 is provided with a first heat dissipation opening 60 , and the second housing 40 is provided with a second heat dissipation opening 70 . The heat dissipation efficiency of the battery assembly 1000 can be improved through the provided heat dissipation vents.

In a specific application, the first heat dissipation vent 60 and the second heat dissipation vent 70 may be disposed on the main body 410 or on the frame. In the embodiment of the present application, the shape and quantity of the vents are not limited. The vents in the present application are circular, elliptical, square, polygonal, a shape composed of curves, or a shape composed of curves and straight lines or For other irregular shapes, the cooling vent can be a larger opening or the cooling vent can also be composed of multiple small openings. Set it according to the need in the specific application.

In an optional embodiment, the first heat dissipation opening 60 at least fully exposes the first heat dissipation fin 302 , and the second heat dissipation opening 70 at least completely exposes the second heat dissipation fin 402 . In this application, by controlling the opening area of the first heat dissipation port 60 and the second heat dissipation port 70, the first heat dissipation port 60 can cover the edge of the first heat dissipation fin 302, and the second heat dissipation port 70 can cover the edge of the second heat dissipation fin 402. Generally, the edge of the heat sink is sharp and may scratch the external device. In this application, the setting of the first heat dissipation port 60 and the second heat dissipation port 70 can prevent scratches; in addition, it can also prevent the metal heat sink from contacting the external The contact of the metal device produces a short circuit, which plays the role of electrical isolation. At the same time, when the shell and the heat sink are fixedly connected, the outer peripheries of the first heat sink and the second heat sink can be fixed to the shell, which is convenient for fixing and installation.

In the embodiment of the present application, as shown in FIGS. A plurality of receiving grooves 501 are provided on the two surfaces 320, and the receiving grooves 501 on the first heat sink 302 are used to cooperate with the receiving grooves 501 at corresponding positions on the second heat sink 402 to form the The storage bin 50 is described.

In this embodiment, the structure of the second heat sink 402 is the same as that of the first heat sink 302 . Wherein the first heat dissipation fin 302 and the second heat dissipation fin 402 both include a heat dissipation substrate 321, and the heat dissipation substrate 321 forms the plurality of accommodating grooves 501 after continuous multiple bending, wherein an arc is formed on the first surface 310 The accommodating groove 501 and the second surface 320 are provided with heat dissipation fins 311 to achieve heat dissipation of the battery cell 10 while fixing and accommodating the battery cell 10 , thereby improving heat dissipation efficiency.

Wherein, the heat dissipation fins 311 can be a single piece, multiple pieces or similar heat absorbing plates parallel to each other, and the heat dissipation fins 311 can be made of aluminum plate material. The heat dissipation fins 311 are fixedly disposed on the heat dissipation substrate 321 (the first surface 310 ).

The shape of the accommodating groove 501 is the same as that of the side surface 120 of the battery cell 10 , and the connection between the accommodating groove 501 and the adjacent accommodating groove 501 is an arc shape, which prevents the side surface 120 of the battery cell 10 from being damaged. Extrusion, used to achieve effects such as heat insulation, heat dissipation, shock absorption and suction. The height of the receiving groove 501 may be lower than the radius of the battery, that is, the heat dissipation substrate 321 on the first heat dissipation fin 302 and the heat dissipation substrate 321 on the second heat dissipation fin 402 are parallel to each other in a direction perpendicular to the main body 410 of the housing 200 . not in contact.

In the embodiment of the present application, the material of the heat dissipation substrate 321 is not limited. In some embodiments, the heat dissipation substrate 321 can be made of the same material as the heat dissipation fins 311, and the heat dissipation substrate 321 is a metal plate. The sheet metal process is bent to form a plurality of receiving grooves 501 arranged continuously. The shape of the heat dissipation fin is the same as that of the heat dissipation substrate 321 at one end close to the first surface 310 , and the height of the heat dissipation fin is flush with the other end far away from the first surface 310 .

In addition, since the heat dissipation substrate 321 can space two adjacent battery cells 10 , a heat dissipation air duct is formed between the battery cells 10 and the battery cells 10 through the space. The heat of the battery can be dissipated through the heat dissipation air duct so that the heat can be exported to the outside of the battery module 100 , improving the heat dissipation effect and helping to increase the service life of the battery module 100 .

The first heat dissipation fin 302 includes a frame 502, which is arranged around the heat dissipation substrate 321, and can be fixed around the heat dissipation substrate 321 by welding during application, and can be used for fixing with the first housing 301 or Compression, for example, facilitates integral molding of the heat sink and the housing. The height of the heat dissipation substrate 321 along the axis of the battery cell 10 is less than or equal to the height of the battery cell 10 .

In this embodiment, the end face 110 includes a first end face and a second end face, the first heat sink 302 and the second heat sink 402 are provided with a first boundary toward the first end face, and the first heat sink The fin and the second cooling fin are provided with a second boundary toward the second end surface, the first boundary and the first end surface have a distance in the height direction of the battery cell 10, and the second boundary and the second end surface There is a distance in the height direction of the battery cells 10 .

Optionally, the battery cells 10 are fixedly arranged on the accommodation compartment 50 (accommodation groove 501 ) by means of thermally conductive structural glue. While the battery cells 10 are fixed by the heat-conducting structural adhesive, the housing compartment 50 is in contact with the surface of the battery cells 10 to absorb heat, so that the heat sink can dissipate heat for multiple battery cells 10 at the same time, improving heat dissipation efficiency.

Optionally, the first housing 301 and the first heat sink 302, the second housing 401 and the second heat sink 402 are all integral structures, and the first heat sink 302 and the first heat sink 302 The two heat sinks 402 are made of metal, and the first housing 301 and the second housing 401 are made of plastic. For example, put the heat sink made of metal into the injection mold, and inject the plastic material into the mold to form an injection-molded integrated structure.

During installation, the first housing 301 and the first heat sink 302, the second housing 401 and the second heat sink 402 are injection-molded integral structures, and the plastic material surrounds the first heat sink 302 is arranged to form the first heat dissipation opening 60 , and the plastic material is arranged around the second heat dissipation fin 402 to form the second heat dissipation opening 70 .

In the embodiment of the present application, the first heat sink 302 and the second heat sink 402 are made of metal materials with good electrical conductivity, such as copper, copper alloy, aluminum or aluminum alloy. The first housing 301 and the second housing 401 may be made of insulating plastic parts, such as one or more materials of PP or PPS. Through integral molding, the formation of the battery assembly 1000 does not require precise positioning, and the installation of the battery assembly 1000 can be realized only by fixing the battery cells 10 in the receiving groove 501 , which is convenient for modular installation, strong in flexibility, and high in expandability.

Please continue to refer to Figures 1-2. In the embodiment of the present application, the battery assembly 1000 further includes: a connecting piece 300 arranged on the end surface 110 of the battery cell 10, and the connecting piece 300 is used to realize different For the electrical connection of the battery cell 10 , the connector 300 is disposed outside the housing 200 , and the pole 20 of the battery cell 10 is connected to the connector 300 through the port 503 .

Through the port 503 provided on the shell 200, the connection between the connector 300 and the pole 20 can be facilitated. When multiple battery cells 10 are connected into a module, the batteries need to be assembled in series or in parallel through the connector 300. The connector 300 The two ends of 300 are respectively welded to the electrode posts 20 of different battery cells 10 to achieve series or parallel connection.

There are two poles 20 in the battery for outputting electric energy to the outside, one is the positive pole 20 and the other is the negative pole 20 . In this embodiment, the two poles 20 are respectively the first pole 201 and the second pole 202. The first pole 201 can be the positive pole 20 or the negative pole 20. Correspondingly, the second pole 202 is the negative pole. 20 or positive pole 20.

In the embodiment of the present application, the connector 300 is made of a metal material with good electrical conductivity, such as copper, copper alloy, aluminum or aluminum alloy. The connection between the connector 300 and the battery post 20 is fixedly connected by welding. During the welding process, the post 20 passes through the port 503 and protrudes outside the casing 200 .

Optionally, the connector 300 includes a first connector 601 for connecting the poles 20 of two adjacent battery cells 10 in the battery module 100 . The electrical connection inside the battery assembly 1000 can be facilitated through the first connecting member 601 .

The first connecting piece 601 is flat, and the first connecting piece 601 is used to connect the pole 20 ( first pole 201 ) and another pole 20 (second pole 202 ) of the battery cell 10 (for example, the second battery cell 102 ).

It should be noted that the first battery cell 101 and the second battery cell 102 refer to the two battery cells 10 covered by a single connector 300, or in other words, the battery module 100 has multiple batteries. The two adjacent batteries can be referred to as a first battery cell 101 and a second battery cell 102 respectively. Here, the battery covered on the left side of the connector 300 is referred to as the first battery cell 101 , and the battery covered on the right side of the connector 300 is referred to as the second battery cell 102 for exemplary description. The electrical connection between the battery cells 10 and the battery module 100 and external components (such as other battery modules 100 ) can both use the first connecting member 601 .

Optionally, the connecting member 300 includes a second connecting member 602, and the second connecting member 602 includes a first connecting portion 621 fixedly connected to a pole 20 of one battery cell 10 and a first connecting portion 621 connected to the first The connecting portion 621 is perpendicular to the second connecting portion 622 , and the second connecting portion 622 is provided with a connecting terminal 623 for realizing external electrical connection. The electrical connection between the battery assembly 1000 and external electrical components can be facilitated through the second connecting member 602 .

The battery module 100 includes a first output pole 610 and a second output pole 620, and the first output pole 610 and the second output pole 620 are respectively provided with second connectors 602 for realizing the battery module The electrical connection between the battery module 100 and the battery module 100 , or the electrical connection between the battery module 100 and other electrical components is not limited in this application.

It can be understood that the first output pole 610 can be connected to the positive pole of the battery cell 10, and be electrically connected with other battery modules 100 or other electrical components through the second connecting piece 602, so that the first output pole 610 Formed as the positive pole of the battery module 100 , the second output pole 620 is directly connected to the negative pole of the cell, so that the second output pole 620 is formed as the negative pole of the battery module 100 . Of course, the first output pole 610 and the second output pole 620 can be interchanged.

The second connecting part 602 is L-shaped, the first connecting part 621 and the second connecting part 622 can be formed as a plate, the first connecting part 621 and the second connecting part 622 can be vertical, and the first connecting part 621 is used for It is welded with the pole 20, and the second connecting portion 622 is used for electrical connection with other external electrical components.

In the embodiment of the present application, the arrangement of the connection terminal 623 on the second connection portion 622 is not limited. The connection terminal 623 may be a terminal post protruding from the second sealing cover, or may be a connection hole. The present application shows that the second connecting portion 622 is provided with two wiring threaded holes, and the wiring bolts can be used to realize fixing and electrical connection through the threads on the wiring threaded holes during wiring. Only one end of the second connection part 622 is connected to the battery pole 20, and by means of the connection terminal 623, problems such as alignment accuracy, welding accuracy, and sealing accuracy that occur when the battery pole 20 is welded to the second connection piece 602 can be avoided. , Improve the electrical connection effect.

Based on the same idea, the present application provides a battery pack, including the battery assembly 1000 described above. In this application, as shown in FIG. 11, the pair of batteries may include one or more battery assemblies 1000, and the battery pack may also include a battery case 400, which can prevent liquid or other foreign matter from affecting the battery module. Charging or discharging of the group 100 . For example, the box body 400 may include an upper cover and a box shell, and the upper cover and the box shell are fastened together. The shapes of the upper cover and the case can be determined according to the shapes of multiple battery modules 100 . Components such as a cooling fan and a high voltage electrical box may also be arranged on the battery box 400 .

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying No device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terminology used herein is only for describing specific implementation purposes, and is not intended to limit the utility model. Terms such as "disposed" appearing herein may mean that one component is directly attached to another component or that one component is attached to another component through an intermediary. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in that other embodiment or stated otherwise.

The present utility model has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of illustration and description, and are not intended to limit the present utility model to the scope of the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teaching of the utility model, and these variations and modifications all fall within the protection scope of the utility model.

Claims (12)

1. A battery pack, characterized in that, comprising: A battery module, the battery module including a plurality of battery cells arranged in sequence; The casing, the casing includes a first casing and a second casing respectively arranged on both sides of the battery module, the first casing includes a first casing and a first heat sink, and the second casing includes a second casing and the second cooling fins, the first cooling fins and the second cooling fins form a plurality of accommodation chambers for accommodating the battery cells. 2. The battery assembly according to claim 1, wherein the battery cell includes an end surface and a side surface, and the end surface is provided with a pole; the storage chamber is in contact with the side surface of the battery cell; The first shell and the second shell cover the end faces of the battery cells and open ports at positions corresponding to the end faces, and the poles of the battery cells are exposed from the ports or pass through the ports. port. 3. The battery assembly according to claim 2, wherein the end face includes a first end face and a second end face, and the first heat sink and the second heat sink are provided with a first end face toward the first end face. Boundary, the first cooling fin and the second cooling fin are provided with a second boundary toward the direction of the second end surface, there is a distance between the first boundary and the first end surface in the height direction of the battery cell, and the first There is a distance between the two boundaries and the second end surface in the height direction of the battery cell. 4 . The battery assembly according to claim 2 , wherein the battery cells are fixed and arranged on the storage compartment by thermally conductive structural glue. 5. The battery pack according to claim 2, further comprising: The connecting piece arranged on the end face of the battery cell, the connecting piece is used to realize the electrical connection of different battery cells, the connecting piece is arranged outside the casing, and the poles of the battery cell A column is connected to the connector. 6 . The battery assembly according to claim 5 , wherein the connecting member comprises a first connecting member, and the first connecting member is used to connect two adjacent battery cells in the battery module pole. 7 . The battery assembly according to claim 5 , wherein the connecting member comprises a second connecting member, and the second connecting member includes a first connecting portion fixedly connected to a pole of one of the battery cells and a second connection portion perpendicular to the first connection portion, the second connection portion is provided with a connection terminal for external electrical connection. 8. The battery assembly according to claim 1, wherein the first heat dissipation fin comprises a first surface and a second surface oppositely disposed, the first surface is provided with heat dissipation fins, and the second A plurality of accommodation grooves are provided on the surface, and the accommodation grooves on the first heat sink are used to cooperate with the accommodation grooves at corresponding positions on the second heat dissipation fin to form the accommodation chamber. 9. The battery assembly according to claim 8, wherein the first heat dissipation fin and the second heat dissipation fin both include a heat dissipation substrate, and the heat dissipation substrate is continuously bent multiple times to form the plurality of housings. groove. 10. The battery assembly according to claim 1, wherein the first case and the first heat sink, the second case and the second heat sink are all integral structures, and the first A heat sink and the second heat sink are made of metal, and the first shell and the second shell are made of plastic. 11. The battery assembly according to claim 10, wherein a first heat dissipation port is provided on the first casing, a second heat dissipation port is provided on the second casing, and the first heat dissipation port is at least completely The first cooling fin is exposed, and the second cooling opening at least fully exposes the second cooling fin. 12. A battery pack, comprising the battery assembly according to any one of claims 1-11.

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