CN218456107U

CN218456107U - Secondary battery shell and secondary battery using same

Info

Publication number: CN218456107U
Application number: CN202222502619.5U
Authority: CN
Inventors: 李峥; 韩波; 冯玉川; 陈凯; 何泓材
Original assignee: Suzhou Qingtao New Energy S&T Co Ltd
Current assignee: Suzhou Qingtao New Energy S&T Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-02-07
Anticipated expiration: 2032-09-21

Abstract

The utility model belongs to the technical field of secondary battery, a secondary battery shell and use secondary battery of this shell is disclosed, the secondary battery shell includes the casing, casing one side is and opens the setting, shells inner wall divide into anti-corrosion coating adhesion area and welding area, welding area does shells inner wall is close to the one side that the casing opened the side, anti-corrosion coating adhesion area glues and is covered with anti-corrosion coating. The utility model discloses can prevent electrolyte and the contact of aluminium system shell with the help of the anti-corrosion coating that sets up on shells inner wall to help reducing the condition that aluminium system shell takes place electrochemical corrosion and chemical corrosion. The utility model provides a secondary battery includes as above-mentioned secondary battery shell to can effectively avoid secondary battery inside electrochemical corrosion and the chemical corrosion of taking place, and then help promoting secondary battery's life.

Description

Secondary battery shell and secondary battery using same

Technical Field

The utility model relates to a secondary battery technical field especially relates to secondary battery shell and use secondary battery of this shell.

Background

With the development of technology, secondary batteries that can be used for a long time have been widely used in devices such as electric vehicles, mobile terminals, and electric bicycles. The secondary batteries on the market mainly include nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead storage) batteries, lithium ion batteries, polymer lithium ion batteries, and the like.

In the prior art, an aluminum shell is generally adopted for a lithium ion battery, and because the distance between aluminum metal lattice octahedrons of the battery shell is close to that of lithium metal, lithium intercalation reaction is easily generated between the aluminum metal lattice octahedrons and lithium ions under the lithium intercalation potential of the aluminum metal to generate an AlLi alloy, so that electrochemical corrosion is generated on an aluminum shell of the lithium ion aluminum shell battery.

In addition, the chemical corrosion of the aluminum shell is slow chemical corrosion at the inner side edge at the initial stage of the aluminum shell, specifically, the HF in the electrolyte inside the battery reacts with the aluminum oxide on the surface layer of the aluminum shell to generate ALF3, the generated fluoride by-products are accumulated continuously along with the chemical corrosion reaction, and due to the good lithium ion channel condition (more electrolyte at the bottom and the side wall), the distance between the battery cell and the aluminum shell is shortened by the metal foreign matters in the battery cell until the metal foreign matters contact with the negative plate to form an electronic channel, so that the electrochemical corrosion reaction is induced to occur.

Therefore, the above problems need to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve among the prior art lithium ion battery shell and easily take place electrochemical corrosion's problem, and provide the secondary battery of secondary battery shell and applied this shell.

To achieve the purpose, the utility model adopts the following technical proposal: the secondary battery shell comprises a shell, wherein one side of the shell is open, the inner wall of the shell is divided into an anti-corrosion layer attachment area and a welding area, the welding area is that the inner wall of the shell is close to one side of the open side of the shell, and the anti-corrosion layer attachment area is adhered with an anti-corrosion layer.

Preferably, the thickness of the corrosion protection layer is 40-200 μm.

Preferably, the anti-corrosion layer is a PP layer or a chloroprene rubber layer or an ethylene propylene rubber layer.

Preferably, the welding area is formed by extending 8-15mm from the open side end of the shell along the inner wall of the shell to the inside of the shell.

The secondary battery comprises a cover plate, a battery cell and a secondary battery shell, wherein the cover plate is used for plugging the open side of the shell of the secondary battery shell, and the battery cell is installed in the secondary battery shell.

Preferably, the cover plate is integrally formed with a clamping block, and the clamping block is clamped with the shell in an adaptive mode on the open side.

Preferably, the cover plate is provided with a pole, and the pole is connected with the battery core.

Preferably, the cover plate is provided with a mounting hole, and the pole is located in the mounting hole.

Preferably, the cover plate is provided with an explosion-proof valve.

Preferably, the cover plate is provided with a liquid injection hole.

The utility model has the advantages that:

an anti-corrosion layer is provided on an inner wall of the secondary battery case, and the anti-corrosion layer separates the secondary battery case from an electrolyte inside the secondary battery. On one hand, the anti-corrosion layer is helpful for preventing the electrolyte from communicating with the aluminum shell and the anode to form an ion path to cause electrochemical corrosion; on the other hand, the corrosion-prevention layer blocks the electrolyte, and thus the electrolyte can be prevented from contacting the aluminum case and causing chemical corrosion.

In addition, a welding area is reserved on one side, close to the open side of the shell, of the inner wall of the shell, and a certain installation room can be reserved for the assembly of a subsequent secondary battery shell, so that the subsequent assembly of the shell is facilitated, and the assembly efficiency of the secondary battery is improved.

Drawings

Fig. 1 is an axial view of the overall structure of a secondary battery in an embodiment of the present invention;

fig. 2 is a schematic diagram of the internal structure of the secondary battery case in the embodiment of the present invention.

In the figure: 1. a housing; 10. a housing open side; 11. an anti-corrosion layer attachment region; 12. a welding area; 2. an anti-corrosion layer; 3. a cover plate; 31. a clamping block; 32. an explosion-proof valve; 33. a liquid injection hole; 34. a pole column; 35. and (7) installing holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

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.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

Example (b):

referring to fig. 1 and 2, the present embodiment provides a secondary battery case including a case 1, wherein one side of the case 1 is open. The housing 1 is provided in a hollow shape of a rectangular parallelepiped, and the housing opening side 10 of the housing 1 is one side along the length direction thereof. The inner walls of the shell 1 are all provided with an anti-corrosion layer 2. It will be appreciated that the provision of the corrosion protection layer 2 on the inner wall of the housing 1 prevents the electrolyte from contacting the aluminium casing, thereby helping to reduce the occurrence of galvanic and chemical corrosion of the aluminium casing.

Further, the inner wall of the case 1 is divided into an anti-corrosion layer adhesion region 11 and a welding region 12, and the welding region 12 is the side of the inner wall of the case 1 close to the case open side 10. Specifically, the welding region 12 is formed by extending 8-15mm from the end of the open side 10 of the casing along the inner wall of the casing 1 into the casing 1, and the rest of the inner wall of the casing 1 is the corrosion-resistant layer adhesion region 11. Based on the above, the welding region 12 formed by extending 8-15mm from the end of the open side 10 of the case to the inside of the case 1 along the inner wall of the case 1 leaves a certain installation space for the subsequent assembly of the case 1, so that the subsequent assembly of the case 1 is facilitated, and the assembly efficiency of the secondary battery is improved. It is to be noted that the distance that the welding area 12 extends into the housing 1 is suitably selected within the above-mentioned numerical range depending on the size of the housing 1. Preferably, the welding area 12 extends into the housing 1 over a distance of 8mm, 10mm, 12mm, which is more convenient for practical operation.

Preferably, the thickness of the corrosion protection layer 2 is 40-200 μm, and the corrosion protection layer 2 is a PP layer. The anti-corrosion layer 2 is adhered on the anti-corrosion layer adhesion region 11, and the anti-corrosion layer 2 fills the anti-corrosion layer adhesion region 11. It can be understood that the PP layer is a good electrical insulator while having good chemical resistance, and the PP layer is relatively cheap, thereby contributing to reducing the production cost of the secondary battery case while ensuring that the corrosion prevention layer 2 has application properties satisfying the secondary battery case. In addition, the thickness of the corrosion prevention layer 2 is set to 40 to 200 μm, which ensures good corrosion prevention of the corrosion prevention layer 2 during the use of the secondary battery. It should be noted that the specific thickness of the corrosion prevention layer 2 may be appropriately selected within the above numerical range according to the use scenario of the secondary battery in practical applications. Preferably, the thickness of the corrosion protection layer 2 is 50 μm, 100 μm, 150 μm, 200 μm, and the above four corrosion protection layers 2 are more convenient for practical operation.

It is understood that in other embodiments, the corrosion protection layer 2 may be a neoprene layer, and the corrosion protection layer 2 may also be an ethylene propylene rubber layer. The chloroprene rubber layer has good ageing resistance, heat resistance, oil resistance and chemical corrosion resistance, so that the service life of the secondary battery shell is prolonged. Meanwhile, the ethylene propylene rubber has good electrical insulation performance, corona resistance, aging resistance, heat resistance and corrosion resistance, thereby being beneficial to prolonging the service life of the secondary battery shell. Of course, the corrosion protection layer 2 can be made of other insulating and corrosion-resistant materials.

The implementation principle of the secondary battery shell of the embodiment of the application is as follows: in practical use, the anti-corrosion layer 2 is arranged on the inner wall of the secondary battery shell, and the anti-corrosion layer 2 separates the secondary battery shell from electrolyte inside the secondary battery. On one hand, the anti-corrosion layer 2 helps to prevent the electrolyte from communicating with the aluminum shell and the anode to form an ion path to cause electrochemical corrosion; on the other hand, the corrosion prevention layer 2 blocks the electrolyte, and thus the electrolyte can be prevented from contacting the aluminum case and causing chemical corrosion.

The embodiment of the application also discloses a secondary battery using the secondary battery shell.

Referring to fig. 1, the secondary battery includes a cover plate 3, a cell, and the above-mentioned secondary battery case, the cover plate 3 is used to seal the open side 10 of the case of the secondary battery case, and the cell is installed in the secondary battery case. Specifically, the cover plate 3 is provided in a long shape, and the cover plate 3 is welded integrally with the welding region 12 on the case 1. It can be understood that, in the secondary battery manufactured by using the casing 1 with the anti-corrosion layer 2, the anti-corrosion layer 2 can effectively prevent electrochemical corrosion and chemical corrosion from occurring inside the secondary battery, thereby contributing to prolonging the service life of the secondary battery.

Specifically, the cover plate 3 is provided with a pole 34, and the pole 34 is connected with the battery cell. The cover plate 3 is provided with a mounting hole 35, and the pole 34 is positioned in the mounting hole 35. The cover plate 3 is integrally formed with two bosses which are respectively positioned at two ends of the cover plate 3. Two mounting holes 35 are formed, and the two mounting holes 35 are formed in the two bosses respectively. Polar columns 34 are coaxially arranged in the two mounting holes 35, one of the two polar columns 34 is a positive polar column, and the other polar column is a negative polar column. It can be understood that the positive electrode terminal and the negative electrode terminal are provided on the cover plate 3, which is more convenient for the secondary battery to be connected with external components for conduction. In addition, all set up anodal utmost point post and negative pole utmost point post in mounting hole 35, help reducing the condition that anodal utmost point post negative pole post takes place to damage because of colliding with.

Further, the cover plate 3 is provided with an explosion-proof valve 32, the cover plate 3 is further provided with a liquid injection hole 33, and the explosion-proof valve 32 and the liquid injection hole 33 are both positioned between the two poles 34. In this embodiment, the explosion-proof valve 32 and the liquid injection hole 33 are both in the prior art and will not be described. In practical use, gas generated by chemical reaction in the secondary battery can be discharged out of the secondary battery case through the explosion-proof valve 32, and the secondary battery can be rapidly prevented from exploding in response to excessive internal pressure. In addition, in the production process of the secondary battery, the electrolyte is injected into the secondary battery through the injection hole 33, so that the operation of injecting the electrolyte can be performed more efficiently and accurately.

In order to promote the efficiency of secondary battery assembly, integrated into one piece has joint piece 31 on apron 3, and joint piece 31 and the open 10 looks adaptations joints of side of casing, and joint piece 31 is located apron 3 and deviates from the one side at its own lug place.

Before the cover plate 3 is packaged, the clamping block 31 is clamped with the open side 10 of the shell in a matched mode, namely the cover plate 3 and the clamping block 31 are pre-fixed, and then the cover plate 3 and the shell 1 are welded into a whole, so that on one hand, welding operation of operators is facilitated; on the other hand, the sealing performance of the connection part of the cover plate 3 and the shell 1 is 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. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. 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. The secondary battery shell is characterized by comprising a shell (1), wherein one side of the shell (1) is open, the inner wall of the shell (1) is divided into an anti-corrosion layer attachment area (11) and a welding area (12), the welding area (12) is the side, close to the shell open side (10), of the inner wall of the shell (1), and the anti-corrosion layer attachment area (11) is adhered with an anti-corrosion layer (2).

2. The secondary battery case according to claim 1, wherein the thickness of the corrosion prevention layer (2) is 40 to 200 μm.

3. The secondary battery case according to claim 1, wherein the corrosion prevention layer (2) is a PP layer or a neoprene layer or an ethylene propylene rubber layer.

4. The secondary battery case according to claim 1, wherein the welding region (12) is formed by extending 8-15mm from the end of the case open side (10) along the inner wall of the case (1) into the case (1).

5. A secondary battery, characterized in that it comprises a cover plate (3), a cell and a secondary battery case according to any one of claims 1 to 4, said cover plate (3) being adapted to close off a case open side (10) of said secondary battery case, said cell being mounted in said secondary battery case.

6. The secondary battery according to claim 5, wherein the cover plate (3) is integrally formed with a clamping block (31), and the clamping block (31) is in adaptive clamping connection with the open side (10) of the shell.

7. The secondary battery according to claim 6, wherein a pole post (34) is disposed on the cover plate (3), and the pole post (34) is connected with the battery cell.

8. The secondary battery according to claim 7, wherein the cover plate (3) is provided with a mounting hole (35), and the pole (34) is located in the mounting hole (35).

9. The secondary battery according to claim 5, wherein an explosion-proof valve (32) is provided on the cap plate (3).

10. The secondary battery according to claim 5, wherein the lid plate (3) is provided with a liquid injection hole (33).