CN213989024U

CN213989024U - Single battery and battery module

Info

Publication number: CN213989024U
Application number: CN202023313122.6U
Authority: CN
Inventors: 于贺; 娄佳训; 高顺航; 于东朋; 马远; 祖春吉; 侯远强; 蔡奂
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-08-17
Anticipated expiration: 2030-12-31

Abstract

The utility model relates to a power battery technical field discloses a battery cell and battery module. The single battery comprises a pole group, a shell, a cover plate and an insulating piece. The two ends of the shell are open and hollow, and the pole group is arranged in the shell. The cover plate comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively plugged at two ends of the shell, a liquid injection hole and a first pole column are arranged on the first cover plate, an explosion-proof valve and a second pole column are arranged on the second cover plate, and the liquid injection hole and the explosion-proof valve are arranged towards the same side of the shell. An insulator is disposed between the cover plate and the pole set. The utility model discloses can realize placing explosion-proof valve and notes liquid hole up simultaneously, avoid explosion-proof valve and annotate the liquid hole and soak in electrolyte, improve battery cell's security.

Description

Single battery and battery module

Technical Field

The utility model relates to a power battery technical field especially relates to a battery cell and battery module.

Background

With the development of new energy technology, lithium batteries are widely used in various fields. In the existing lithium battery, a part adopts a cover plate on which a positive pole and a negative pole are arranged simultaneously, and an explosion-proof valve and a liquid injection hole are arranged between the two poles; the other part adopts the both ends of battery cell respectively to set up a apron, is equipped with a utmost point post on every apron. For the single battery with cover plates arranged at two ends, when the single battery is placed, the two cover plates face to two ends of the horizontal direction, so that if the explosion-proof valve is soaked in electrolyte, exhaust is easily caused to be unsmooth, the liquid injection hole is arranged in the middle, liquid injection difficulty can also be caused, the liquid injection hole is soaked in the electrolyte for a long time, risks such as electrolyte leakage are caused, and safety is reduced.

Accordingly, a single battery and a battery module are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery cell and battery module, be convenient for place explosion-proof valve and notes liquid hole simultaneously up, avoided explosion-proof valve and notes liquid hole to soak in electrolyte, improved battery cell's security.

To achieve the purpose, the utility model adopts the following technical proposal:

a cell, comprising:

a pole group;

the two ends of the shell are open and the shell is hollow, and the pole group is arranged in the shell;

the cover plate comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively plugged at two ends of the shell, a liquid injection hole and a first pole column are arranged on the first cover plate, an explosion-proof valve and a second pole column are arranged on the second cover plate, and the liquid injection hole and the explosion-proof valve are arranged towards the same side of the shell;

an insulator disposed between the cover plate and the pole group.

Preferably, a first sealing ring is arranged between the first pole and the first cover plate.

Preferably, a second sealing ring is arranged between the second pole and the second cover plate.

Preferably, a third sealing ring is arranged between the explosion-proof valve and the second cover plate.

Preferably, a sealing nail is arranged in the liquid injection hole.

Preferably, the first cover plate is a negative electrode cover plate, the first pole is a negative electrode pole, the second cover plate is a positive electrode cover plate, and the second pole is a positive electrode pole.

Preferably, the cover plate and the shell are both made of metal.

Preferably, the housing is rectangular in cross-section.

A battery module comprises the single battery.

Preferably, the openings at the two ends of the shell are arranged along the horizontal direction, the liquid injection hole in the first cover plate is arranged above the first pole, and the explosion-proof valve in the second cover plate is arranged above the second pole.

The utility model has the advantages that: the liquid injection hole and the explosion-proof valve are arranged towards the same side of the shell, the liquid injection hole and the explosion-proof valve can be arranged towards the upper side simultaneously, the liquid injection hole and the explosion-proof valve are prevented from being soaked in electrolyte, the exhaust smoothness of the explosion-proof valve is guaranteed, the risk of leakage of the electrolyte from the liquid injection hole is reduced, the safety of the single batteries is improved, two pole columns are arranged downwards simultaneously, the busbar between the single batteries is convenient to arrange, and the practicability is improved.

Drawings

Fig. 1 is an exploded view of a single battery provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first cover plate according to an embodiment of the present invention.

In the figure:

1. a housing; 2. a first cover plate; 3. a second cover plate; 4. a liquid injection hole;

5. a first pole column; 6. an explosion-proof valve; 7. a second pole; 8. a first insulator.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present embodiment provides a unit cell. Specifically, as shown in fig. 1 to 2, the unit cell includes a pole group, a case 1, a cap plate, and an insulating member. The two ends of the shell 1 are open and hollow, and the pole group is arranged in the shell 1. The cover plate comprises a first cover plate 2 and a second cover plate 3, the first cover plate 2 and the second cover plate 3 are respectively plugged at two ends of the shell 1, a liquid injection hole 4 and a first pole post 5 are arranged on the first cover plate 2, an explosion-proof valve 6 and a second pole post 7 are arranged on the second cover plate 3, and the liquid injection hole 4 and the explosion-proof valve 6 are arranged towards the same side of the shell 1. An insulator is disposed between the cover plate and the pole set. To annotate liquid hole 4 and explosion-proof valve 6 towards the same one side setting of casing 1, can realize annotating liquid hole 4 and explosion-proof valve 6 and move towards the top setting simultaneously, avoided annotating liquid hole 4 and explosion-proof valve 6 to soak in electrolyte, guaranteed explosion-proof valve 6's exhaust unblocked, also reduced the risk that electrolyte leaked from annotating liquid hole 4, the security of battery cell has been improved, and two utmost point posts arrange downwards simultaneously, the arrangement of the busbar between the battery cell of also being convenient for, the practicality has been improved. And set up the insulating part between apron and utmost point group, guaranteed the insulating nature between utmost point group and the apron, avoided the apron to go up electrified, further improved the security.

It can be understood that the first pole post 5 is disposed through the first cover plate 2 and electrically connected to one end of the pole set, and the second pole post 7 is disposed through the second cover plate 3 and electrically connected to the other end of the pole set.

In the present embodiment, as shown in fig. 1, the insulating member includes a first insulating member 8 and a second insulating member, the first insulating member 8 being provided on the first cover plate 2, and the second insulating member being provided on the second cover plate 3.

In this embodiment, the first cover plate 2 is a negative electrode cover plate, the first electrode post 5 is a negative electrode post, the second cover plate 3 is a positive electrode cover plate, and the second electrode post 7 is a positive electrode post. In other embodiments, the first cover plate 2 may be a positive cover plate, the first electrode post 5 may be a positive electrode post, the second cover plate 3 may be a negative cover plate, and the second electrode post 7 may be a negative electrode post, which is not limited herein.

Preferably, the material of apron and casing 1 is the metal, has guaranteed apron and casing 1's structural strength, and accessible laser welding is connected between apron and the casing 1, and joint strength is higher and the leakproofness of junction is better. The cover plate and the shell 1 are preferably made of aluminum, so that the cover plate is light in weight, high in strength and easy to obtain.

In this embodiment, the cross section of the casing 1 is rectangular, and both ends of the casing 1 are plugged by the cover plates to form a rectangular parallelepiped. In particular, the casing 1 has four side walls, the filler hole 4 being arranged towards the same side wall as the explosion-proof valve 6. And the distance between the liquid injection hole 4 and the edge of the first cover plate 2 can be adaptively adjusted according to the injection amount of the electrolyte, and similarly, the distance between the explosion-proof valve 6 and the edge of the second cover plate 3 can also be adaptively adjusted according to the injection amount of the electrolyte, which is not limited herein. In other embodiments, the cross-section of the housing 1 may also be circular, elliptical, etc.

Specifically, a sealing nail is arranged in the liquid injection hole 4. Set up sealed nail and guaranteed that the inside electrolyte of battery cell can not flow by annotating liquid hole 4, avoided electrolyte to cover on battery cell's surface to reduce the possibility of battery cell short circuit, improved the security.

Preferably, a first sealing ring is arranged between the first pole 5 and the first cover plate 2. Set up first sealing washer between first utmost point post 5 and first apron 2, guaranteed battery cell's sealing performance. It can be understood that the material of the first sealing ring is preferably rubber, and the sealing performance and the durability are better.

Preferably, a second sealing ring is arranged between the second pole post 7 and the second cover plate 3. And a second sealing ring is arranged between the second pole post 7 and the second cover plate 3, so that the sealing performance of the single battery is ensured. It can be understood that the material of the second sealing ring is preferably rubber, and the sealing performance and the durability are better.

Preferably, a third sealing ring is arranged between the explosion-proof valve 6 and the second cover plate 3. And a third sealing ring is arranged between the explosion-proof valve 6 and the second cover plate 3, so that the sealing performance of the single battery is ensured. It can be understood that the third sealing ring is preferably made of rubber, and has better sealing performance and durability.

The embodiment also provides a battery module. The battery module comprises the single battery.

Preferably, the openings at the two ends of the casing 1 are arranged along the horizontal direction, the liquid injection hole 4 on the first cover plate 2 is arranged above the first pole post 5, and the explosion-proof valve 6 on the second cover plate 3 is arranged above the second pole post 7. When above-mentioned battery cell arranges inside the battery module in, the lateral wall that annotates liquid hole 4 and explosion-proof valve 6 on the casing 1 back to each other sets up down, make annotate liquid hole 4 highly be higher than first utmost point post 5, explosion-proof valve 6 highly be higher than second utmost point post 7, can realize annotating liquid hole 4 and explosion-proof valve 6 and set up towards the top simultaneously, avoided annotating liquid hole 4 and explosion-proof valve 6 to soak in electrolyte, be favorable to the utmost point group all to soak in electrolyte in annotating the part below liquid hole 4, the unblocked of exhausting of explosion-proof valve 6 has been guaranteed, the risk of electrolyte from annotating liquid hole 4 leakage has also been reduced, the security of battery cell has been improved, the practicality has been improved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cell, comprising:

a pole group;

the electrode group comprises a shell (1), two ends of the shell are opened and the shell is hollow, and the electrode group is arranged in the shell (1);

the cover plate comprises a first cover plate (2) and a second cover plate (3), the first cover plate (2) and the second cover plate (3) are respectively plugged at two ends of the shell (1), the first cover plate (2) is provided with a liquid injection hole (4) and a first pole column (5), the second cover plate (3) is provided with an explosion-proof valve (6) and a second pole column (7), and the liquid injection hole (4) and the explosion-proof valve (6) are arranged towards the same side of the shell (1);

an insulator disposed between the cover plate and the pole group.

2. The single battery according to claim 1, characterized in that a first sealing ring is arranged between the first pole (5) and the first cover plate (2).

3. The single battery according to claim 1, characterized in that a second sealing ring is arranged between the second pole (7) and the second cover plate (3).

4. The single battery according to claim 1, characterized in that a third sealing ring is arranged between the explosion-proof valve (6) and the second cover plate (3).

5. The single battery according to claim 1, characterized in that a sealing nail is arranged in the liquid injection hole (4).

6. The cell according to claim 1, wherein the first cover plate (2) is a negative electrode cover plate, the first terminal (5) is a negative electrode terminal, the second cover plate (3) is a positive electrode cover plate, and the second terminal (7) is a positive electrode terminal.

7. The single battery according to claim 1, wherein the cover plate and the housing (1) are both made of metal.

8. The cell according to claim 1, characterised in that the cross section of the casing (1) is rectangular.

9. A battery module comprising the unit battery according to any one of claims 1 to 8.

10. The battery module according to claim 9, wherein the openings at both ends of the case (1) are arranged in a horizontal direction, the liquid injection hole (4) in the first cover plate (2) is arranged above the first terminal post (5), and the explosion-proof valve (6) in the second cover plate (3) is arranged above the second terminal post (7).