CN215119055U

CN215119055U - Power battery top cap

Info

Publication number: CN215119055U
Application number: CN202121552350.0U
Authority: CN
Inventors: 路宝; 王媛; 詹新举; 窦元运
Original assignee: Wuhu Etc Battery Ltd
Current assignee: Wuhu Etc Battery Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2021-12-10
Anticipated expiration: 2031-07-08

Abstract

The utility model discloses a power battery top cap relates to power battery's technical field, including the top cap piece, the positive post, the negative pole post, the explosion-proof piece, heat conduction cover and top open the post, wherein, both sides about the top cap piece are installed respectively to positive post and negative pole post, the centre of top cap piece is equipped with the pressure release mouth of rectangle between two parties, explosion-proof piece horizontal welding is in the downside of pressure release mouth, heat conduction cover distributes under the weak structure of explosion-proof piece, heat conduction cover is hemispherical casing, the upper portion welding of the inboard of heat conduction cover has the support frame, the vertical welding in centre of support frame has the guide ring, the bottom of the inboard of heat conduction cover is fixed with elastic stock solution, be equipped with the sodium chloride solution in the stock solution bag, top open the post is fixed in the upside of stock solution bag between two parties, the vertical setting of top open the post and slip cartridge in the guide ring. When the power battery's inside takes place the thermal runaway, the liquid storage bag is propped open to the hot steam of sodium chloride solution after being heated back production, and then drives the weak department of structure that the back opened post rose and back opened the explosion-proof piece, realizes the pressure release.

Description

Power battery top cap

Technical Field

The utility model relates to a power battery's technical field, concretely relates to power battery top cap.

Background

The lithium ion power battery is a novel high-energy battery successfully developed in the 20 th century. The negative electrode of the battery is made of materials such as graphite, and the positive electrode is made of materials such as lithium iron phosphate, lithium cobaltate, lithium titanate and the like. It has high energy, high battery voltage, wide working temperature range, long storage life and other advantages, and may be used widely in military and civil small electric appliance.

At present, in order to ensure the safety of the power battery, a pressure relief opening is formed in the middle of a battery top cover, and an explosion-proof piece is welded at the position of the pressure relief opening, so that the safety performance of the power battery can be improved to a certain extent. However, under special conditions such as overcharge or internal thermal runaway of the power battery, the internal air pressure is increased, and a gap generated by the rupture of the explosion-proof sheet is small, so that the internal air pressure cannot be removed in time, the whole battery is exploded, and the battery is damaged irreparably.

Disclosure of Invention

The utility model aims at providing a power battery top cap to solve the above-mentioned defect that leads to among the prior art.

The utility model provides a power battery top cap, includes top cap piece, anodal post, anodal aluminium piece, negative pole post, negative pole aluminium piece, explosion-proof piece, heat conduction cover and top open column, wherein:

the left side and the right side of the top cover plate are symmetrically provided with circular mounting holes, the middle part of the positive pole column is formed into an I-shaped positive pole nanometer injection molding plastic sleeve through an NMT technology, the positive pole nanometer injection molding plastic sleeve is clamped at the mounting hole at the left side, the top end of the positive pole column is connected with a positive pole aluminum block, the middle part of the negative pole column is formed into an I-shaped negative pole nanometer injection molding plastic sleeve through an NMT technology, the negative pole nanometer injection molding plastic sleeve is clamped at the mounting hole at the right side, and the top end of the negative pole column is connected with a negative pole aluminum block;

the middle of the top cover plate is provided with a rectangular pressure relief opening in the middle, the explosion-proof sheet is horizontally welded at the lower side of the pressure relief opening, the upper side and the lower side of the explosion-proof sheet are symmetrically provided with rectangular milling grooves, the left end and the right end of each milling groove are used as structural weaknesses of the explosion-proof sheet, the heat conduction cover is provided with a pair of heat conduction covers which are correspondingly distributed under the two structural weaknesses of the explosion-proof sheet, each heat conduction cover is a hemispherical shell, the opening of each heat conduction cover is upward, the top edge of each heat conduction cover is provided with a circular heat cover nano injection plastic ring formed by an NMT technology, the heat cover nano injection plastic rings are fixed at the lower side of the top cover plate, each heat cover nano injection plastic ring is correspondingly provided with a notch groove at the overlapping part of the explosion-proof sheet, the upper part of the inner side of each heat conduction cover is welded with a cross-shaped support frame, the middle of each support frame is vertically welded with a guide ring, and the bottom of the inner side of each heat conduction cover is fixed with an elastic liquid storage bag, the liquid storage bag is filled with sodium chloride solution, the ejection column is fixed on the upper side of the liquid storage bag in the middle, and the ejection column is vertically arranged and is inserted in the guide ring in a sliding manner.

Preferably, the outer wall of the heat conducting cover is uniformly welded with heat conducting fins.

Preferably, the edge welding of the upside of top flap at the pressure release mouth has the ring of placing of rectangle, place the inboard level of ring and place the screening glass.

Preferably, the top cover plate is symmetrically provided with round liquid injection holes at the left side and the right side of the pressure relief opening.

Compared with the prior art, the utility model provides a power battery top cap has following advantage: when power battery's inside emergence thermal runaway, the temperature of inside atmospheric pressure and electrolyte all can rise thereupon, hot electrolyte can pass through the mode synchronous transfer of water bath heating with part heat and give the sodium chloride solution in heat conduction cover and the stock solution bag, the sodium chloride solution is heated and is produced hot steam and struts the stock solution bag, and then drives the weak department of structure that the back opened the post and rises and back opened the explosion-proof piece, inside atmospheric pressure can in time be followed the opening part discharge on both sides, thereby prevent that power battery from taking place thorough explosion.

Drawings

Fig. 1 is a schematic structural diagram of the overall assembly of the present invention.

Fig. 2 is a schematic structural diagram of the overall explosion of the present invention.

Fig. 3 is a schematic structural view of the explosion-proof sheet of the present invention.

Fig. 4 is a schematic structural diagram of the heat conducting cover of the present invention.

Wherein:

1-top cover sheet; 1 a-mounting holes; 1 b-a pressure relief vent; 1 c-a liquid injection hole; 2-positive pole column; 3-positive pole nanometer injection plastic cover; 4-positive electrode aluminum block; 5-a negative pole column; 6-negative pole nanometer injection plastic cover; 7-negative pole aluminum block; 8-explosion-proof piece; 8 a-milling a groove; 9-placing a ring; 10-a protective sheet; 11-a heat conducting shield; 12-a thermally conductive sheet; 13-heat covering nanometer injection molding plastic ring; 13 a-a notch groove; 14-a support frame; 15-a guide ring; 16-a liquid storage bag; 17-open the column.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

As shown in fig. 1 to 4, a power battery top cap includes top cap piece 1, positive pole post 2, positive pole aluminium piece 4, negative pole post 5, negative pole aluminium piece 7, explosion-proof piece 8, heat conduction cover 11 and top open post 17, wherein:

the left side and the right side of the top cover plate 1 are symmetrically provided with circular mounting holes 1a, the middle part of the positive pole column 2 is formed into an I-shaped positive pole nanometer injection plastic sleeve 3 through an NMT technology, the positive pole nanometer injection plastic sleeve 3 is clamped at the mounting hole 1a at the left side, the top end of the positive pole column 2 is connected with a positive pole aluminum block 4, the middle part of the negative pole column 5 is formed into an I-shaped negative pole nanometer injection plastic sleeve 6 through an NMT technology, the negative pole nanometer injection plastic sleeve 6 is clamped at the mounting hole 1a at the right side, and the top end of the negative pole column 5 is connected with a negative pole aluminum block 7;

the middle of the top cover plate 1 is provided with a rectangular pressure relief opening 1b in the middle, the explosion-proof piece 8 is horizontally welded on the lower side of the pressure relief opening 1b, the upper and lower bilateral symmetry of the explosion-proof piece 8 is provided with rectangular milling grooves 8a, the left and right ends of the milling grooves 8a are taken as the structural weak positions of the explosion-proof piece 8, the heat conducting cover 11 is provided with a pair of heat conducting covers and correspondingly distributed under the two structural weak positions of the explosion-proof piece 8, the heat conducting cover 11 is a hemispherical shell, the opening of the heat conducting cover is upward arranged, the top edge of the heat conducting cover 11 is formed into a circular heat cover nano injection molding plastic ring 13 through an NMT technology, the heat cover nano injection molding plastic ring 13 is fixed on the lower side of the top cover plate 1, the heat cover nano injection molding plastic ring 13 is correspondingly provided with a notch 13a at the overlapping position of the explosion-proof piece 8, and the upper part of the inner side of the heat conducting cover 11 is welded with a cross-shaped support frame 14, the vertical welding in the middle of support frame 14 has guide ring 15, the bottom of the inboard of heat conduction cover 11 is fixed with elastic stock solution bag 16, be equipped with the sodium chloride solution in the stock solution bag 16, top open column 17 is fixed in the upside of stock solution bag 16 in the middle of, top open column 17 is vertical to be set up and slip cartridge in guide ring 15.

In this embodiment, the heat conducting fins 12 are uniformly welded to the outer wall of the heat conducting cover 11. The contact area between the heat conducting cover 11 and the electrolyte can be increased by adding the heat conducting fins 12, so that the heat conducting effect is improved.

In this embodiment, a rectangular placing ring 9 is welded at the edge of the pressure relief opening 1b on the upper side of the top cover sheet 1, and a protection sheet 10 is horizontally placed on the inner side of the placing ring 9. Protection of the explosion-proof sheet is achieved by attaching the protective sheet 10.

In this embodiment, the top lid sheet 1 is provided with circular injection holes 1c symmetrically on both left and right sides of the pressure release port 1 b. The injection hole 1c is opened to inject the electrolyte.

In this embodiment, this kind of power battery top cap is when the practical application: when power battery's inside emergence thermal runaway, the temperature of inside atmospheric pressure and electrolyte all can rise thereupon, hot electrolyte can pass through the mode synchronous transfer of water bath heating with part heat and give the sodium chloride solution in heat conduction cover 11 and the liquid storage bag 16, the sodium chloride solution is heated and is produced hot steam and struts liquid storage bag 16, and then drive the weak department of structure that the back opened post 17 rises and back opened explosion-proof piece 8, inside atmospheric pressure can in time be followed the opening part on both sides and discharged, thereby prevent that power battery from taking place thorough explosion.

The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.

Claims

1. The utility model provides a power battery top cap which characterized in that: including top cap piece (1), anodal post (2), anodal aluminium piece (4), negative pole post (5), negative pole aluminium piece (7), explosion-proof piece (8), heat conduction cover (11) and top open post (17), wherein:

the left side and the right side of the top cover plate (1) are symmetrically provided with circular mounting holes (1a), the middle part of the positive pole column (2) is formed into an I-shaped positive pole nanometer injection molding plastic sleeve (3) through an NMT technology, the positive pole nanometer injection molding plastic sleeve (3) is clamped at the mounting hole (1a) at the left side, the top end of the positive pole column (2) is connected with a positive pole aluminum block (4), the middle part of the negative pole column (5) is formed into an I-shaped negative pole nanometer injection molding plastic sleeve (6) through an NMT technology, the negative pole nanometer injection molding plastic sleeve (6) is clamped at the mounting hole (1a) at the right side, and the top end of the negative pole column (5) is connected with a negative pole aluminum block (7);

the middle of the top cover plate (1) is provided with a rectangular pressure relief opening (1b) in the middle, the explosion-proof piece (8) is horizontally welded on the lower side of the pressure relief opening (1b), the upper side and the lower side of the explosion-proof piece (8) are symmetrically provided with rectangular milling grooves (8a), the left end and the right end of each milling groove (8a) serve as structural weak positions of the explosion-proof piece (8), the heat conducting cover (11) is provided with a pair of heat conducting covers and correspondingly distributed under the two structural weak positions of the explosion-proof piece (8), the heat conducting cover (11) is a hemispherical shell, the opening of each heat conducting cover is upwards arranged, the top edge of each heat conducting cover (11) is provided with a circular heat conducting cover nanometer injection molding plastic ring (13) through NMT technology molding, the heat conducting cover nanometer injection molding plastic ring (13) is fixed on the lower side of the top cover plate (1), and the heat conducting cover nanometer injection molding plastic ring (13) is correspondingly provided with a notch groove (13a) at the overlapping position of the explosion-proof piece (8), support frame (14) of "ten" style of calligraphy are welded to the upper portion of the inboard of heat conduction cover (11), the vertical welding in centre of support frame (14) has guide ring (15), the bottom of the inboard of heat conduction cover (11) is fixed with elastic stock solution bag (16), be equipped with the sodium chloride solution in stock solution bag (16), top open post (17) are fixed in the upside of stock solution bag (16) between two parties, top open post (17) vertical setting and slip cartridge in guide ring (15).

2. The power battery top cover according to claim 1, characterized in that: the outer wall of the heat conducting cover (11) is uniformly welded with heat conducting fins (12).

3. The power battery top cover according to claim 1, characterized in that: the edge welding of the upside of top sheet (1) at pressure release mouth (1b) has the ring (9) of placing of rectangle, place the inboard level of ring (9) and placed screening glass (10).

4. The power battery top cover according to claim 1, characterized in that: the top cover piece (1) is symmetrically provided with round liquid injection holes (1c) at the left side and the right side of the pressure relief opening (1 b).