Battery top cover capable of preventing liquid leakage

Abstract

The utility model provides a battery top cover capable of preventing liquid leakage. A sealing ring is a step ring consisting of an upper vertical section, a transverse connecting section and a lower vertical section; a boss is arranged in the middle of the pole, the sealing ring wraps the outer side wall of the boss, the bottom wall of the boss and the partial side wall, located at the lower end of the boss, of the pole, the pole is installed in the installation hole in a sealed mode through the sealing ring, and the turnover ring is turned over towards the direction of the pole and used for preventing the pole from moving upwards; the upper plastic coats the turnover ring in a hot melting injection molding manner, and the gap between the turnover ring and the pole is filled with the upper plastic in an injection molding manner; according to the utility model, the opposite positions of the pole and the metal ring are coated by the sealing ring for multiple sealing, so that the sealing failure of the battery core caused by the abnormal laser welding of the metal ring is effectively prevented, and the short circuit phenomenon between the pole and the bottom plate caused by impurities in the battery core entering the pole in the working process of the battery core can be prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lithium ion battery especially relates to a battery top cover of leakage prevention. BACKGROUND

[0002] With the development of new energy, the requirement of energy density of the existing battery is further improved, and the new energy power battery is usually a secondary battery, which refers to the battery that can be activated by charging after discharging.

[0003] The existing lithium battery is a high-energy-density battery, and the electrolyte inside the battery is a flammable and explosive substance. Therefore, the sealing ring plays a very important role in the design, manufacture and use of the battery top cover.

[0004] The existing top cover design has a certain risk of welding gas leakage between the pole and the bottom plate during the battery working process. In the long-term working process, if there are corrosion cavities or pinholes in the welding position, it will cause the pole to leak during the battery working process, which will cause a series of adverse reactions (such as: battery gas leakage, electrolyte evaporation, etc.). Further, it will cause the performance of the battery to decline, and even may cause safety risks.

[0005] Therefore, we propose a battery top cover to solve the problem of the risk of pole leakage. CONTENT OF THE UTILITY MODEL

[0006] The utility model discloses a battery top cover of leakage prevention, which solves the problem of the risk of pole leakage.

[0007] A battery top cover of leakage prevention, comprising: a top cover sheet having a through mounting hole, a metal ring welded to the bottom of the mounting hole, and a folding ring at the upper end of the mounting hole; a lower plastic assembled on the back of the top cover sheet; a sealing ring composed of an upper vertical section, a horizontal connecting section, and a lower vertical section; a pole having a boss in the middle, the sealing ring covering the outer sidewall of the boss, the bottom wall of the boss, and the part of the sidewall of the pole below the lower end of the boss, the pole being sealed and installed in the mounting hole by the sealing ring, the folding ring being folded towards the pole and used to prevent the pole from moving upwards; an upper plastic hot melt injection molded on the folding ring, the upper plastic injection filling the gap between the folding ring and the pole; the positions of the pole and the metal ring opposite to each other are sealed by the sealing ring, effectively preventing the sealing failure of the battery caused by abnormal laser welding of the metal ring, and preventing the impurities inside the battery from entering the inside of the pole during the working process of the battery, causing short circuit between the pole and the bottom plate.

[0008] Further preferably, the upper vertical section is wrapped around the outer sidewall of the boss, and the upper vertical section seals the gap between the folded ring and the outer sidewall of the boss.

[0009] Further preferably, the horizontal connecting section seals the gap between the bottom of the boss and the metal ring.

[0010] Further preferably, the lower vertical section seals the gap between the sidewall of the pole and the sidewall of the metal ring.

[0011] Further preferably, the lower plastic top end is provided with a plurality of fixing buckles on both sides.

[0012] Further preferably, the bottom end of the top cover sheet is provided with a fixing hole matched with the lower plastic fixing buckle.

[0013] Further preferably, the surface of the top cover sheet is provided with a waist-shaped hole and a liquid injection hole.

[0014] Further preferably, the waist-shaped hole is provided with an anti-explosion valve, and the top end of the anti-explosion valve is provided with a protective sheet.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] The utility model discloses a sealing ring is designed into the step ring that comprises an upper vertical section, a horizontal connecting section and a lower vertical section, and the middle and lower parts of the pole are wrapped in sequence by the upper vertical section, the horizontal connecting section and the lower vertical section, and the gap between the middle and lower parts of the pole and the folded ring and the metal ring is sealed by the sealing ring multiple times. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the explosion schematic view of the utility model;

[0018] Figure 2 It is the assembly schematic view of the utility model;

[0019] Figure 3 It is the sectional view of the utility model;

[0020] Figure 4 It is Figure 3 It is the enlarged schematic view at A;

[0021] Figure 5 It is the sectional view of the sealing ring.

[0022] In the figure: top cover sheet 1, sealing ring 2, pole 3, upper plastic 4, metal ring 5, lower plastic 6, explosion-proof valve 7, protective mold 8, mounting hole 11, folded ring 12, upper vertical section 21, horizontal connecting section 22, lower vertical section 23, boss 31, lower side wall 32. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0024] REFERENCE Figures 1-5 A battery top cover capable of preventing liquid leakage comprises: a top cover sheet 1, wherein a through mounting hole 11 is arranged on the top cover sheet 1, a metal ring 5 is welded at the bottom of the mounting hole 11, and a folded ring 12 is arranged at the upper end of the mounting hole 11; a lower plastic 6, which is assembled on the back of the top cover sheet 1; a sealing ring 2, which is a stepped ring composed of an upper vertical section 21, a horizontal connecting section 22 and a lower vertical section 23; a pole 3, wherein the middle part of the pole 3 is provided with a boss 31, the sealing ring 2 is wrapped on the outer side wall of the boss 31, the bottom wall of the boss 31 and part of the side wall of the pole 3 located at the lower end of the boss 31, the pole 3 is sealedly installed in the mounting hole 11 through the sealing ring 2, the folded ring 12 is folded towards the pole 3 and is used for preventing the pole 3 from moving upward; an upper plastic 4, which is hot melt injection molded and wrapped on the folded ring 12, and the upper plastic 4 injection fills the gap between the folded ring 12 and the pole 3.

[0025] The sealing ring is designed as a stepped ring composed of an upper vertical section 21, a horizontal connecting section 22 and a lower vertical section 23, the upper vertical section 21, the horizontal connecting section 22 and the lower vertical section 23 wrap the middle and lower parts of the pole in sequence, the gap between the middle and lower parts of the pole 3 and the folded ring 12 and the metal ring 5 is sealed by the sealing ring, if the welding of the bottom welding area of the top cover is poor and gas leakage occurs, the upper vertical section 21 and the lower vertical section 23 wrapped on the pole can effectively seal the gap between the pole and the folded ring 12 and the gap between the pole and the side wall of the metal ring 5, thereby avoiding the phenomenon that the whole battery cell leaks gas and liquid due to poor welding of the bottom welding area.

[0026] In addition to preventing electrolyte leakage, the sealing ring can also keep the internal environment of the battery stable, the normal operation of the battery requires a stable environment, the role of the sealing ring is to keep the internal environment of the battery stable, thereby improving the efficiency and service life of the battery, and thereby improving the safety and reliability of the battery product.

[0027] The opposite positions of the pole column 3 and the metal ring 5 are covered and sealed by the sealing ring, abnormal laser welding of the metal ring is effectively prevented, the sealing of the battery cell is not affected, and the impurities in the battery cell can be prevented from entering the pole column in the working process, and the short circuit phenomenon between the pole column and the bottom plate is avoided.

[0028] The upper vertical section 21 is covered on the outer side wall of the boss 31, and the upper vertical section 21 seals the gap between the folded ring 12 and the outer side wall of the boss 31.

[0029] In the embodiment, the gap between the outer side wall of the boss 31 and the folded ring 12 is sealed by the upper vertical section 21 to realize the first sealing.

[0030] The horizontal connecting section 22 seals the gap between the bottom of the boss 31 and the metal ring 5.

[0031] In the embodiment, the gap between the bottom of the boss 31 and the metal ring 5 is sealed by the horizontal connecting section 22 to realize the second sealing.

[0032] The lower vertical section 23 seals the gap between the side wall of the pole column 3 and the side wall of the metal ring 5.

[0033] In the embodiment, the gap between the side wall of the pole column 3 and the side wall of the metal ring 5 is sealed by the lower vertical section 23 to realize the third sealing.

[0034] In the embodiment, the thickness of the upper vertical section 21, the horizontal connecting section 22 and the lower vertical section 23 can be set according to the gap between the pole column and the folded ring 12 and the metal ring 5, and the thickness of the three sections can be the same or different.

[0035] The sealing ring is designed as a stepped ring composed of the upper vertical section 21, the horizontal connecting section 22 and the lower vertical section 23 to realize three sealing, if the welding of the top cover bottom welding area is poor and gas leakage occurs, at this time, the upper vertical section 21 (the first sealing) and the lower vertical section 23 (the third sealing) wrapped on the pole column can effectively seal the gap between the pole column and the folded ring 12 and the gap between the pole column and the side wall of the metal ring 5, and the gas leakage and liquid leakage phenomenon of the whole battery cell caused by the poor welding of the bottom welding area is avoided.

[0036] A plurality of fixing buckles are arranged on both sides of the top end of the lower plastic 6, and a fixing hole matched with the fixing buckles of the lower plastic 6 is arranged at the bottom end of the top cover sheet 1.

[0037] In the embodiment: the lower plastic 6 is provided with a plurality of fixing buckle structures at the top end of both sides, the top cover sheet 1 is provided with a fixing hole matched with the fixing buckle on the lower plastic 6, and the mounting mode of the top cover sheet 1 and the lower plastic 6 is that the fixing buckle and the fixing hole are assembled in place first, and then the top cover sheet 1 and the lower plastic 6 are assembled, the assembling mode is buckle or ultrasonic hot melting, and preferably the ultrasonic hot melting is adopted to assemble the top cover sheet 1 and the lower plastic 6.

[0038] The surface of the top cover sheet 1 is provided with a waist-shaped hole and a liquid injection hole, the waist-shaped hole is provided with an explosion-proof valve, and the top end of the explosion-proof valve is provided with a protection sheet.

[0039] In the embodiment: the waist-shaped hole on the top cover sheet 1 is used for explosion-proof valve assembly welding, the explosion-proof valve is provided with a protection sheet, the protection sheet is pasted above the explosion-proof valve, the explosion-proof valve can be broken when the internal pressure of the battery cell reaches a critical point, which can effectively prevent the explosion of the battery cell due to excessive internal pressure, and the protection sheet can protect the explosion-proof valve from the outside, which can effectively prevent the explosion-proof valve from being affected by the outside.

Claims

1. A liquid leakage-proof battery top cover, characterized in that, It includes: A top cover sheet, which is provided with a through mounting hole, the bottom of the mounting hole is welded with a metal ring, and the upper end of the mounting hole is provided with a folded ring; A lower plastic, which is assembled on the back of the top cover sheet; A sealing ring, which is composed of a stepped ring of an upper vertical section, a horizontal connecting section and a lower vertical section; A pole, which has a boss in the middle part, the sealing ring is wrapped on the outer sidewall of the boss, the bottom wall of the boss and the part of the pole below the lower end of the boss, the pole is sealed and installed in the mounting hole through the sealing ring, the folded ring is folded towards the pole and is used to prevent the pole from moving upward; An upper plastic, which is hot melt injection molded and wrapped on the folded ring, the upper plastic injection fills the gap between the folded ring and the pole.

2. The battery cover of claim 1, wherein, The upper vertical section is wrapped on the outer sidewall of the boss, and the upper vertical section seals the gap between the folded ring and the outer sidewall of the boss.

3. A battery cover that prevents liquid leakage according to claim 2, wherein The horizontal connecting section seals the gap between the bottom of the boss and the metal ring.

4. The battery cover of claim 3, wherein the cover is made of a material that is resistant to liquid penetration. The lower vertical section seals the gap between the sidewall of the pole and the sidewall of the metal ring.

5. The battery cover of claim 1, wherein the cover is made of a material that is resistant to liquid penetration. The lower plastic is provided with a plurality of fixing buckles on both sides of the top end.

6. A battery cover that prevents liquid leakage according to claim 5, wherein The bottom end of the top cover sheet is provided with a fixing hole matched with the upper fixing buckle of the lower plastic.

7. The battery cover of claim 1, wherein the cover is made of a material that is resistant to liquid penetration. The surface of the top cover sheet is provided with a waist-shaped hole and a liquid injection hole.

8. A battery cover that prevents liquid leakage according to claim 7, wherein The waist-shaped hole is provided with an explosion-proof valve, and the top end of the explosion-proof valve is provided with a protective sheet.

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