CN220172246U - Single battery, battery pack and vehicle - Google Patents

Abstract

The utility model provides a single battery, a battery pack and a vehicle, wherein the single battery comprises: a housing defining a receiving cavity; the battery cell is arranged in the accommodating cavity; the positive pole post and the negative pole post are respectively arranged on the outer surface of the shell, the positive pole post is electrically connected with the positive pole of the electric core, the negative pole post is electrically connected with the negative pole of the electric core, and the negative pole post protrudes out of the outer surface of the shell along the first direction; the first connecting piece and second connecting piece, at least a portion of first connecting piece and at least a portion of second connecting piece are spaced apart along first direction, and first connecting piece is connected with the negative pole post electricity, and the second connecting piece is connected with the casing electricity, and first connecting piece is connected with the second connecting piece complex in order to electrically connect negative pole post and casing. The single battery has the advantages that the structure of the combination of the first connecting piece and the second connecting piece is simple, and the reliability is high and the connection is convenient when the first connecting piece and the second connecting piece are connected with the corresponding negative pole column and the shell.

Description

Single battery, battery pack and vehicle

Technical Field

The present utility model relates to the field of battery technology, and more particularly, to a single battery, a battery pack having the single battery, and a vehicle having the battery pack.

Background

The battery can be assembled by casing and electric core, wherein, can set up the casing into the steel casing to reduce the wall thickness of casing when guaranteeing casing intensity, improve the space utilization of battery. However, the steel shell has high potential iron melting risk, and the safety of the battery is affected, so that the steel shell is usually designed to be negatively charged so as to avoid iron melting corrosion. However, the structure for negatively charging the battery case in the related art is complicated, the cost is high, and the assembly is inconvenient.

Disclosure of Invention

An object of the present utility model is to provide a new technical solution for a single battery, which can at least solve one of the problems of complexity, high cost and inconvenient assembly of the decoupling strands for negatively charging the battery case in the prior art.

It is still another object of the present utility model to provide a battery pack including the above-described unit cells.

It is still another object of the present utility model to provide a vehicle including the above battery pack.

According to a first aspect of the present utility model, there is provided a unit cell comprising: a housing defining a receiving cavity; the battery cell is arranged in the accommodating cavity; the positive pole post and the negative pole post are respectively arranged on the outer surface of the shell, the positive pole post is electrically connected with the positive pole of the electric core, the negative pole post is electrically connected with the negative pole of the electric core, and the negative pole post protrudes out of the outer surface of the shell along the first direction; the first connecting piece and the second connecting piece, at least a portion of first connecting piece with at least a portion of second connecting piece is followed the first direction is spaced apart, first connecting piece with the negative pole post electricity is connected, the second connecting piece with the casing electricity is connected, and first connecting piece with the second connecting piece is connected in order to electrically connect negative pole post with the casing.

Optionally, the first connecting piece is welded with the negative electrode post, and the second connecting piece is welded with the outer surface of the shell.

Optionally, the melting point of the first connecting piece is the same as the melting point of the negative electrode post, and the melting point of the second connecting piece is the same as the melting point of the shell.

Optionally, the negative electrode post and the first connecting piece are respectively formed into aluminum parts, and the housing and the second connecting piece are respectively formed into steel parts.

Optionally, the housing comprises: a housing defining the receiving cavity, the housing having an opening in communication with the receiving cavity; the cover plate is covered at the opening, the positive pole column and the negative pole column are arranged on the first side surface of the cover plate, which is far away from the accommodating cavity, and the second connecting piece is connected with the first side surface of the cover plate.

Optionally, the negative electrode post protrudes from the first side surface of the cover plate along the first direction, at least a portion of the first connecting piece is formed into a first plate body, at least a portion of the second connecting piece is formed into a second plate body, the first plate body and the second plate body extend along the second direction respectively and are spaced apart along the first direction, a side surface of the first plate body, which is close to the second plate body, is connected with a side surface of the negative electrode post, which is far away from the cover plate, and a side surface of the second plate body, which is far away from the first plate body, is connected with the first side surface of the cover plate.

Optionally, a portion of the first connecting member and/or the second connecting member is formed as a third plate extending in the first direction, in which one end of the third plate is connected to an end of the first plate and the other end of the third plate is connected to an end of the second plate.

Optionally, the third plate body includes a first plate portion and a second plate portion arranged along the first direction, the first plate portion is formed as a part of the first connecting member, the second plate portion is formed as a part of the second connecting member, in the first direction, one end of the first plate portion is connected with an end of the first plate body, one end of the second plate portion is connected with an end of the second plate body, and the other end of the first plate portion is connected with the other end of the second plate portion in a composite manner.

Optionally, the first connecting piece and the second connecting piece are integrally formed parts compounded by hot aluminum.

According to a second aspect of the present utility model, there is provided a battery pack comprising the unit cells according to any one of the above embodiments.

According to a third aspect of the present utility model, there is provided a vehicle comprising the battery pack according to any one of the above embodiments.

According to the single battery, the first connecting piece and the second connecting piece are matched to electrically connect the negative pole column and the outer surface of the shell, so that the surface of the shell is negatively charged, the corrosion risk of the shell can be effectively reduced, the safety of the battery cell is improved, and the composite structure of the first connecting piece and the second connecting piece is simple. In addition, the first connecting piece and the second connecting piece are in compound connection, so that materials of the connecting pieces directly connected with the negative pole column and the shell are different, and reliability and convenience in the process that the first connecting piece and the second connecting piece are electrically connected with the corresponding negative pole column or shell are improved.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a perspective view of a unit cell according to an embodiment provided by the present utility model;

FIG. 2 is an enlarged view of the encircled portion of FIG. 1 at A;

fig. 3 is an exploded view of a unit cell according to an embodiment provided by the present utility model;

fig. 4 is a perspective view of a partial structure of a unit cell according to an embodiment provided by the present utility model;

fig. 5 is a perspective view of a first connector and a second connector according to one embodiment provided by the present utility model.

Reference numerals

A single battery 100;

a housing 10; a housing 11; a cover plate 12; a liquid injection hole 121; an explosion-proof valve 122;

a cell 20; a positive electrode tab 21; negative electrode tab 22.

A positive electrode post 30; a positive electrode mounting block 31;

a negative electrode column 40; a negative electrode mounting block 41;

a first connector 50; a first plate 51; a first plate portion 52;

a second connector 60; a second plate body 61; a second plate portion 62;

and a connection structure 70.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Hereinafter, a unit cell 100 according to an embodiment of the present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 5, a unit cell 100 according to an embodiment of the present utility model includes: the battery pack comprises a housing 10, a battery cell 20, a positive electrode post 30, a negative electrode post 40, a first connecting piece 50 and a second connecting piece 60.

Specifically, the housing 10 defines a housing cavity, the battery cell 20 is disposed in the housing cavity, the positive electrode post 30 and the negative electrode post 40 are disposed on the outer surface of the housing 10, the positive electrode post 30 is electrically connected with the positive electrode of the battery cell 20, the negative electrode post 40 is electrically connected with the negative electrode of the battery cell 20, the negative electrode post 40 protrudes from the outer surface of the housing 10 along the first direction, at least a portion of the first connecting member 50 is spaced apart from at least a portion of the second connecting member 60 along the first direction, the first connecting member 50 is electrically connected with the negative electrode post 40, the second connecting member 60 is electrically connected with the housing 10, and the first connecting member 50 is connected with the second connecting member 60 to electrically connect the negative electrode post 40 and the housing 10.

In other words, the unit cell 100 according to the embodiment of the present utility model is mainly composed of the case 10, the battery cell 20, the positive electrode post 30, the negative electrode post 40, the first connection member 50, and the second connection member 60. Wherein, the interior of the shell 10 can be provided with a containing cavity, the containing cavity can be a closed cavity, and the battery cell 20 can be contained in the containing cavity. In addition, electrolyte can be contained in the containing cavity.

The battery cell 20 may have a positive electrode tab 21 and a negative electrode tab 22, the housing 10 may be provided with a positive electrode post 30 and a negative electrode post 40, the positive electrode post 30 may be electrically connected with the positive electrode tab 21 of the battery cell 20 to lead the positive electrode of the battery cell 20 out of the accommodating cavity, and the negative electrode post 40 may be electrically connected with the negative electrode tab 22 of the battery cell 20 to lead the negative electrode of the battery cell 20 out of the accommodating cavity. The positive and negative poles of the battery cell 20 are led out through the positive pole post 30 and the negative pole post 40, so that the single battery 100 can be conveniently connected with other electrical equipment.

A part or all of the negative electrode posts 40 may extend in the first direction and protrude from the outer surface of the case 10, and the negative electrode posts 40 protruding from the outer surface of the case 10 may be connected to the positive electrode posts 30 or the negative electrode posts 40 of the adjacent unit batteries 100 through connection pieces, or may be connected to other electrical devices.

In addition, the negative electrode post 40 and the case 10 may be electrically connected by the first and second connection members 50 and 60. Specifically, the first connection member 50 may be electrically connected to the negative electrode post 40, the second connection member 60 may be electrically connected to the housing 10, and the first connection member 50 and the second connection member 60 may be connected to each other by a combination connection method including but not limited to. The negative electrode post 40 is electrically connected with the casing 10, so that the surface of the casing 10 is negatively charged, the risk of corrosion of the casing 10 is reduced, and the safety of the single battery 100 is improved.

It should be noted that, the first connecting piece 50 and the second connecting piece 60 are in composite connection, and the connecting pieces made of two different materials are composited in a composite manner including but not limited to thermal compositing, and the composited first connecting piece 50 and the composited second connecting piece 60 have preset bonding strength so as to ensure the reliability of the connection between the two connecting pieces.

In addition, since the negative electrode post 40 protrudes from the outer surface of the case 10 in the first direction, a part or all of the first connection member 50 may be spaced apart from a part or all of the second connection member 60 in the first direction, and it may be convenient that a part or all of the first connection member 50 is opposite to the negative electrode post 40 and a part or all of the second connection member 60 is opposite to the outer surface of the case 10, so that the first connection member 50 and the second connection member 60 may be adapted to the corresponding negative electrode post 40 or case 10.

Therefore, according to the single battery 100 of the embodiment of the utility model, the first connecting piece 50 and the second connecting piece 60 are arranged to be matched to electrically connect the negative electrode post 40 and the outer surface of the casing 10, so that the surface of the casing 10 is negatively charged, the corrosion risk of the casing 10 can be effectively reduced, the safety of the battery cell 20 is improved, and the composite structure of the first connecting piece 50 and the second connecting piece 60 is simple. In addition, the first and second connection members 50 and 60 are provided to be combined and connected, and materials of the connection members directly connected to the negative electrode post 40 and the case 10 may be made different, so as to improve reliability and convenience when the first and second connection members 50 and 60 are electrically connected to the corresponding negative electrode post 40 or case 10.

In some embodiments, the positive and negative electrode posts 30 and 40 may include a post body and a mounting block, respectively, on which the post body may be mounted. For convenience of explanation, the mounting blocks in the positive electrode post 30 may be defined as positive electrode mounting blocks 31, and the mounting blocks in the negative electrode post 40 may be defined as negative electrode mounting blocks 41. The first connection member 50 may be connected with the negative electrode mounting block 41, thereby achieving connection between the first connection member 50 and the negative electrode post 40.

According to some alternative embodiments of the present utility model, the first connection member 50 is welded to the negative electrode post 40, and the second connection member 60 is welded to the outer surface of the case 10, which is advantageous in improving the strength and reliability of the connection between the first connection member 50 and the negative electrode post 40 and between the second connection member 60 and the case 10, so that the electrical connection between the negative electrode post 40 and the case 10 is more reliable. Alternatively, the first connector 50 may be welded with the negative electrode mounting post 41.

In addition, a welding process may be used when assembling the battery cell 20 and the case 10, so that two connection members are provided to be welded with the corresponding negative electrode post 40 or the case 10, which is advantageous in simplifying the manufacturing process of the unit cell 100.

According to one embodiment of the present utility model, the melting point of the first connection member 50 is the same as that of the negative electrode post 40, and the melting point of the second connection member 60 is the same as that of the case 10.

Specifically, by providing the first connection member 50 and the negative electrode post 40 to have the same melting point, and the second connection member 60 and the case 10 to have the same melting point, it is possible to facilitate welding between each connection member and the corresponding negative electrode post 40 or case 10.

In addition, the anode post 40 and the casing 10 may be made of materials having different melting points, that is, the melting points of the anode post 40 and the casing 10 may be different, so that the melting points of the first connector 50 and the second connector 60 may be different, and by providing two connectors having different melting points to be welded with the corresponding anode post 40 or casing 10, respectively, the welding difficulty may be reduced, the welding cost may be reduced, and the welding strength may be improved.

According to other embodiments of the present utility model, the negative electrode post 40 and the first connection member 50 are respectively formed as aluminum members, and the case 10 and the second connection member 60 are respectively formed as steel members.

For example, the anode mounting block 41 in the anode stem 40 may be formed as an aluminum block, and a portion of the aluminum block may protrude from the outer surface of the case 10 such that the first side of the aluminum block is spaced apart from the outer surface of the case 10 in the first direction.

The casing 10 may be formed as a steel case, and the steel case is higher in structural strength under the same space utilization condition as compared with an aluminum case, and the wall thickness of the steel case may be smaller than that of the aluminum case under the same structural strength condition, thereby saving the space occupied by the casing 10, improving the space utilization of the battery cell 20, and improving the energy density of the unit battery 100. In addition, the steel shell has the advantage of lower cost.

Through being connected negative pole post 40 with the steel casing electricity, can make the steel casing negatively charged to avoid casing 10 positively charged, thereby effectively reduce the risk that casing 10 takes place to melt the iron corrosion, improve the security of electric core 20. Meanwhile, since the steel shell is negatively charged, the insulating film in the single battery 100 can be omitted, so that the insulating film assembly process in the production process of the single battery 100 is omitted, the cost of the single battery 100 is further reduced, and the production yield of the single battery 100 is improved.

In addition, the first connection member 50 may be made of aluminum material, and the second connection member 60 may be made of steel material, so that the first connection member 50 and the negative electrode post 40 may have the same melting point, and the second connection member 60 and the case 10 may have the same melting point, facilitating welding of each connection member and the corresponding negative electrode post 40 or case 10.

Because the welding cost of the cathode post 40 and the shell 10, which are made of a single metal and different materials, is high, the steel-aluminum composite connection structure 70 is formed by compounding the first connecting piece 50 made of aluminum and the second connecting piece 60 made of steel between the cathode post 40 and the shell 10, so that the cost for electrically connecting the cathode post 40 and the shell 10 can be effectively reduced.

In some embodiments of the present utility model, the housing 10 includes: the shell 11 and the cover plate 12, wherein the shell 11 is limited with holding the chamber, and shell 11 has the opening that communicates with holding the chamber, and the cover plate 12 lid is located the opening part, and positive post 30 and negative post 40 are located the first side that the cover plate 12 kept away from holding the chamber, and the second connecting piece 60 is connected with the first side of cover plate 12.

In other words, the case 10 of the present embodiment may be mainly composed of the case 11 and the cover plate 12, wherein the case 11 may have a receiving cavity and an opening, the opening may communicate with the receiving cavity, and the battery cell 20 may be fitted into the receiving cavity through the opening. The cover plate 12 may be provided at an opening of the housing 11 to close the accommodating chamber in cooperation with the housing 11. The cover plate 12 and the housing 11 may be sealed with insulation to prevent leakage of electrolyte in the receiving chamber.

Specifically, the positive electrode post 30 and the negative electrode post 40 may be disposed on the cover plate 12, respectively, and a side surface of the cover plate 12 away from the accommodating cavity may be a first side surface of the cover plate 12, and a side surface of the cover plate 12 close to the accommodating cavity may be a second side surface of the cover plate 12.

The first connecting piece 50 can be connected with one side of the cathode post 40 far away from the shell 10, and the second connecting piece 60 can be connected with the first side of the cover plate 12, so that the first connecting piece 50 and the second connecting piece 60 can be connected closely, the size of the connecting structure 70 formed by compounding the first connecting piece 50 and the second connecting piece 60 is reduced, and the cost of the connecting structure 70 is reduced.

Alternatively, the aluminum block formed as the negative electrode post 40 may be stamped and formed, and the cover plate 12 may be a stamped steel plate.

In some embodiments, the specific process of assembling the unit cell 100 may be as follows.

The aluminum block is connected with the cover plate 12, the first connecting piece 50 and the second connecting piece 60 are compounded to form a connecting structure 70, then the first connecting piece 50 and the negative pole 40 in the compounded connecting structure 70 are welded, the second connecting piece 60 and the cover plate 12 are welded, then the battery cell 20 and the cover plate 12 are assembled through laser welding, finally the welding is assembled by the battery cell 20 and the shell 11 of the cover plate 12, the negative pole of the battery cell 20 is led out from the negative pole 40, and the surface of the shell 10 is negatively charged.

In some alternative embodiments, the cover plate 12 may be further provided with a liquid injection hole 121 and an explosion-proof valve 122, the liquid injection hole 121 may be used for injecting electrolyte into the accommodating cavity, and the explosion-proof valve 122 may perform pressure relief when the pressure in the accommodating cavity is too high.

According to some alternative embodiments of the present utility model, the negative electrode post 40 protrudes from the first side of the cap plate 12 in the first direction, at least a portion of the first connection member 50 is formed as a first plate body 51, at least a portion of the second connection member 60 is formed as a second plate body 61, the first plate body 51 and the second plate body 61 extend in the second direction and are spaced apart in the first direction, one side of the first plate body 51 near the second plate body 61 is connected with one side of the negative electrode post 40 away from the cap plate 12, and one side of the second plate body 61 away from the first plate body 51 is connected with the first side of the cap plate 12.

Specifically, a portion of the negative electrode post 40 may protrude from the first side surface of the cap plate 12 in the first direction, that is, a side surface of the negative electrode post 40 remote from the case 10 and the first side surface of the cap plate 12 may form a drop in the first direction.

A part or all of the first connection member 50 may be formed as the first plate body 51, a part or all of the second connection member 60 may be formed as the second plate body 61, and the first plate body 51 may extend in the second direction, and the first plate body 51 and the second plate body 61 may be parallel to each other. The first plate body 51 may be connected to a side surface of the negative electrode post 40 spaced apart from the first side surface of the cap plate 12, and the second plate body 61 may be connected to the first side surface of the cap plate 12, and thus, the first plate body 51 and the second plate body 61 may be spaced apart in the first direction,

it should be noted that, the composite connection between the first connection member 50 and the second connection member 60 may be a direct composite connection or an indirect composite connection, which is not limited herein, and when all of the first connection member 50 is formed as the first plate 51 and all of the second connection member 60 is formed as the second plate 61, the first connection member 50 and the second connection member 60 may be compositely connected by other connection structures 70 so as to connect the first plate 51 and the second plate 61 spaced apart in the first direction.

In the present embodiment, by providing the first plate body 51 connected to the anode post 40 and the second plate body 61 connected to the cover plate 12, the area where the first plate body 51 is connected to the anode post 40 and the area where the second plate body 61 is connected to the cover plate 12 can be increased, thereby facilitating improvement of the reliability of the connection between the first plate body 51 and the anode post 40 and between the second plate body 61 and the cover plate 12.

According to other embodiments of the present utility model, a portion of the first and/or second connection members 50, 60 is formed as a third plate extending in the first direction, one end of the third plate being connected to an end of the first plate 51 and the other end of the third plate being connected to an end of the second plate 61.

Specifically, the specific structure of the first and second connection members 50 and 60 may include, but is not limited to, the following.

In the first case, the whole of the first connection member 50 is formed as the first plate body 51, a part of the second connection member 60 is formed as the second plate body 61, and a further part of the second connection member 60 is formed as the third plate body;

in the second case, the entirety of the second connection member 60 is formed as the second plate body 61, a part of the first connection member 50 is formed as the first plate body 51, and a further part of the first connection member 50 is formed as the third plate body;

in case three, a part of the first connection member 50 is formed as the first plate body 51, a part of the second connection member 60 is formed as the second plate body 61, and a further part of the first connection member 50 is formed as the third plate body in cooperation with a further part of the second connection member 60.

The third plate body may be formed by the first connection member 50 and/or the second connection member 60, and the first plate body 51 and the second plate body 61 spaced apart in the first direction may be connected using the third plate body such that the first plate body 51 and the second plate body 61 are closely connected.

In addition, the third plate body may extend along the first direction, so that the connection structure 70 formed by combining the first connection member 50 and the second connection member 60 is substantially in a "Z" shape, so that the connection structure 70 formed by combining has advantages of compactness and high reliability.

In some embodiments, the first direction and the second direction may be perpendicular to each other, that is, the first plate 51 and the third plate may be perpendicular to each other, and the second plate 61 and the third plate may be perpendicular to each other, so as to enhance the strength of the composite connection structure 70.

Alternatively, when the connection structure 70 is manufactured, steel materials may be hot-melted and cast on an aluminum plate, and a steel-aluminum composite plate is formed by extrusion, and then the steel-aluminum composite plate is cut into a shape with one end being a steel plate and one end being an aluminum plate, and then the steel-aluminum composite plate is bent into the Z-shaped connection structure 70 by a stamping mode.

In some embodiments of the present utility model, the third plate body includes a first plate portion 52 and a second plate portion 62 arranged in a first direction, the first plate portion 52 is formed as a part of the first connection member 50, the second plate portion 62 is formed as a part of the second connection member 60, one end of the first plate portion 52 is connected to an end of the first plate body 51, one end of the second plate portion 62 is connected to an end of the second plate body 61, and the other end of the first plate portion 52 is compositely connected to the other end of the second plate portion 62.

That is, in the present embodiment, a part of the first connection member 50 is formed as the first plate body 51, a further part of the first connection member 50 may be formed as the first plate body 52, a part of the second connection member 60 is formed as the second plate body 61, a further part of the second connection member 60 may be formed as the second plate body 62, and the first plate body 52 and the second plate body 62 may constitute the third plate body.

Specifically, the first plate 51 and the second plate 61 may be staggered in the first direction, the first plate 52 may be located at a side of the second plate 62 away from the second plate 61, an end of the first plate 52 away from the second plate 62 may be connected to an end of the first plate 51, and an end of the second plate 62 away from the first plate 52 may be connected to an end of the second plate 61.

In other words, the first connecting member 50 and the second connecting member 60 may be respectively formed into a bending structure, and the bending positions are respectively set on the first connecting member 50 and the second connecting member 60, so that the strength of the connecting structure 70 formed by compounding the first connecting member 50 and the second connecting member 60 can be improved, and the fracture of the compounding part caused by bending the compounding part of the first connecting member 50 and the second connecting member 60 during punching is avoided.

According to other embodiments of the present utility model, the first and second connection members 50 and 60 are integrally formed with each other by thermal aluminum to enhance the connection strength between the first and second connection members 50 and 60.

The embodiment of the utility model also provides a battery pack including the unit battery 100 according to any one of the above embodiments. The number of the unit cells 100 in the battery pack may be plural. Since the single battery 100 according to the embodiment of the present utility model has the above technical effects, the battery pack according to the embodiment of the present utility model also has the corresponding technical effects, that is, the surface of the case 10 is negatively charged, so that the corrosion risk of the case 10 can be effectively reduced, the safety of the battery cell 20 is improved, and the reliability and convenience of the first connection member 50 and the second connection member 60 when electrically connected with the corresponding negative electrode post 40 or the case 10 are improved.

The embodiment of the utility model also provides a vehicle, which comprises the battery pack according to the embodiment. Since the battery pack according to the embodiment of the present utility model has the above technical effects, the vehicle according to the embodiment of the present utility model also has the corresponding technical effects, that is, the surface of the case 10 is negatively charged, so that the risk of corrosion of the case 10 can be effectively reduced, the safety of the battery cell 20 can be improved, and the reliability and convenience of the first connection member 50 and the second connection member 60 when electrically connected with the corresponding negative electrode post 40 or the case 10 can be improved.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (11)

1. A single cell, characterized by comprising:

a housing defining a receiving cavity;

the battery cell is arranged in the accommodating cavity;

the positive pole post and the negative pole post are respectively arranged on the outer surface of the shell, the positive pole post is electrically connected with the positive pole of the electric core, the negative pole post is electrically connected with the negative pole of the electric core, and the negative pole post protrudes out of the outer surface of the shell along the first direction;

the first connecting piece and the second connecting piece, at least a portion of first connecting piece with at least a portion of second connecting piece is followed the first direction is spaced apart, first connecting piece with the negative pole post electricity is connected, the second connecting piece with the casing electricity is connected, and first connecting piece with the second connecting piece is connected in order to electrically connect negative pole post with the casing.

2. The cell according to claim 1, wherein the first connector is welded to the negative electrode post and the second connector is welded to an outer surface of the case.

3. The unit cell according to claim 2, wherein the first connecting member has a melting point identical to that of the negative electrode post, and the second connecting member has a melting point identical to that of the case.

4. The unit cell according to claim 3, wherein the negative electrode post and the first connection member are respectively formed as aluminum members, and the case and the second connection member are respectively formed as steel members.

5. The unit cell according to any one of claims 1 to 4, wherein the case comprises:

a housing defining the receiving cavity, the housing having an opening in communication with the receiving cavity;

the cover plate is covered at the opening, the positive pole column and the negative pole column are arranged on the first side surface of the cover plate, which is far away from the accommodating cavity, and the second connecting piece is connected with the first side surface of the cover plate.

6. The battery cell as defined in claim 5, wherein the negative electrode post protrudes from a first side of the cap plate in the first direction, at least a portion of the first connecting member is formed as a first plate, at least a portion of the second connecting member is formed as a second plate, the first plate and the second plate extend in the second direction and are spaced apart in the first direction, a side of the first plate adjacent to the second plate is connected to a side of the negative electrode post remote from the cap plate, and a side of the second plate remote from the first plate is connected to the first side of the cap plate.

7. The unit cell according to claim 6, wherein a part of the first connection member and/or the second connection member is formed as a third plate body extending in the first direction in which one end of the third plate body is connected to an end of the first plate body and the other end of the third plate body is connected to an end of the second plate body.

8. The cell according to claim 7, wherein the third plate body includes a first plate portion and a second plate portion arranged in the first direction, the first plate portion is formed as a part of the first connecting member, the second plate portion is formed as a part of the second connecting member, one end of the first plate portion is connected to an end of the first plate body in the first direction, one end of the second plate portion is connected to an end of the second plate body, and the other end of the first plate portion is compositely connected to the other end of the second plate portion.

9. The cell of claim 5, wherein the first connector and the second connector are a thermally aluminum composite integral part.

10. A battery pack, comprising: the unit cell of any one of claims 1-9.

11. A vehicle, characterized by comprising: the battery pack of claim 10.