CN215816255U

CN215816255U - Battery explosion-proof valve, battery top cover with same and battery

Info

Publication number: CN215816255U
Application number: CN202121757900.2U
Authority: CN
Inventors: 李海; 刘灿; 陈俊
Original assignee: Guangzhou Zhipeng Manufacturing Co ltd
Current assignee: Guangzhou Zhipeng Manufacturing Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-02-11
Anticipated expiration: 2031-07-29

Abstract

The utility model relates to a battery explosion-proof valve, a battery top cover with the same and a battery. The position department that the stress is great on the nick is provided with the nick rib, and the thickness of the explosion-proof valve gap of nick rib department is greater than the thickness of the explosion-proof valve gap of nick department, avoids the fracture to appear in the great position of stress on the explosion-proof valve gap, has solved the problem that the valve body crackle can appear under the condition that the internal gas pressure of electricity core does not reach the pressure release threshold value, has protected the airtight function of battery explosion-proof valve. Meanwhile, the material of one surface of the battery explosion-proof valve facing the inside of the battery core is subjected to anticorrosion treatment, so that the corrosion of electrolyte, impurities or gas in the battery core on the material of the explosion-proof valve is avoided.

Description

Battery explosion-proof valve, battery top cover with same and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery explosion-proof valve, a battery top cover with the same and a battery.

Background

Under the condition of thermal runaway, the battery can quickly release electric energy and chemical energy stored in the battery, so that electrolyte and chemical substances in the battery are quickly decomposed to generate a large amount of gas, and further the pressure in the battery is sharply increased. In order to avoid explosion caused by over-high pressure of the inner wall of the battery, the battery is often provided with a battery explosion-proof valve for pressure relief.

The battery explosion-proof valve is a safety device integrated in a battery structure, the function of the explosion-proof valve is to provide a cell safety pressure relief threshold value, and the pressure relief valve is opened in time when the pressure in the cell reaches the threshold value, so that the risk of overvoltage explosion inside the cell is avoided. Meanwhile, when the pressure in the battery core is lower than the threshold value, the airtight state is kept, and the influence of the external environment on the inside of the battery core is isolated.

At present, a metal sheet is generally used as a base body of the battery explosion-proof valve, a weak structure is manufactured on the metal sheet in a stamping mode and the like, and the pressure relief threshold value of the explosion-proof valve is adjusted and controlled by controlling the residual thickness and width of notches of the stamping and post-annealing treatment. The problem that this technique exists at present is that the explosion-proof valve nick of making is homogeneous structure, and when the pressure was higher in the electric core, the inflation that the charge-discharge brought can bring the respiratory effect of inside atmospheric pressure, appears the circulation increase and the reduction of atmospheric pressure in the electric core promptly. This respiration effect can lead to the little bloating and the shrink of explosion-proof valve, causes constantly accumulated stress to weak structure nick, the nick of homogeneity can be because the difference of stress appears in the position that its place valve body is different, the nick in the great position of stress is changeed and is appeared the fracture, lead to appearing the valve body crackle promptly under the condition that the interior atmospheric pressure of electric core does not reach the pressure release threshold value, the airtight function of electric core explosion-proof valve will be destroyed to this crackle, the risk that leads to electric core performance to descend and the incident appears exists.

Meanwhile, the metal material used by the explosion-proof valve also has the corrosion problem in the use process of the battery cell, for example, hydrofluoric acid in electrolyte is corroded, and particularly, the notch of the valve is thinner, and a small amount of corrosion also can cause the reduction of the pressure relief threshold of the valve body, so that the abnormal valve opening or crack problem of the battery cell explosion-proof valve occurs. Thereby causing cell performance degradation and risk of safety failure.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

The utility model aims to provide a battery explosion-proof valve, a battery top cover with the same and a battery, which can eliminate or weaken the risk of microcracks caused by the breathing effect of the charge and discharge expansion of a battery cell in the use process of the battery explosion-proof valve.

The utility model provides a battery explosion-proof valve which comprises an explosion-proof valve ring and an explosion-proof valve cover, wherein the explosion-proof valve ring is arranged at the outer edge of the explosion-proof valve cover in a surrounding manner, nicks are arranged on the explosion-proof valve cover, nick reinforcing parts are arranged on the nicks, and the thickness of the explosion-proof valve cover at the nick reinforcing parts is larger than that of the explosion-proof valve cover at the nicks.

Further, the battery explosion-proof valve further comprises a first valve cover reinforcing rib and a second valve cover reinforcing rib, the first valve cover reinforcing rib and the second valve cover reinforcing rib are arranged on the explosion-proof valve cover, and the first valve cover reinforcing rib and the second valve cover reinforcing rib are symmetrical about the long axis of the explosion-proof valve cover and are opposite in opening direction.

Further, the notch reinforcing part is provided on the notch of the opening side of the second valve cover reinforcing rib or the notches of both ends of the long axis of the explosion-proof valve cover.

Further, the battery explosion-proof valve also comprises a connecting part, the connecting part is positioned on the nick on the opening side of the first valve cover reinforcing rib, and the thickness of the explosion-proof valve cover at the connecting part is equal to that of the explosion-proof valve cover.

Further, the notch is annularly arranged on the outer edge of the explosion-proof valve cover.

Further, the first valve cover reinforcing rib and the second valve cover reinforcing rib are semicircular, and the first valve cover reinforcing rib and the second valve cover reinforcing rib are located inside the notch.

Furthermore, the nicks, the nick reinforcing part, the first valve cover reinforcing rib and the second valve cover reinforcing rib are formed on the explosion-proof valve cover in a punching mode.

Further, the thickness of the explosion-proof valve ring is 0.3-2mm, the thickness of the explosion-proof valve cover is 0.2-1mm, the thickness of the explosion-proof valve cover at the positions of the first valve cover reinforcing rib and the second valve cover reinforcing rib is 0.1-1mm, the thickness of the explosion-proof valve cover at the notch position is 0.05-0.3mm, and the thickness of the explosion-proof valve cover at the notch reinforcing part is 0.1-0.3 mm.

The utility model also provides a battery top cover which comprises the positive pole column, the negative pole column and the battery explosion-proof valve, wherein the positive pole column, the negative pole column and the battery explosion-proof valve are fixedly arranged on the battery top cover.

The utility model also provides a battery, which comprises the battery top cover.

According to the battery explosion-proof valve, the battery top cover and the battery, the notch reinforcing part is arranged at the position, with larger stress, of the notch, so that the structural strength of the notch is enhanced. The thickness of the explosion-proof valve cover of nick rib department is greater than the thickness of the explosion-proof valve cover of nick department, avoids appearing the fracture in the great position of stress on the explosion-proof valve cover, can eliminate or weaken this battery explosion-proof valve because the little crack risk that electric core charge-discharge inflation's respiratory effect leads to in the use, has solved the problem that the valve body crackle can appear under the condition that the internal gas pressure of electric core does not reach the pressure release threshold value, has protected the airtight function of battery explosion-proof valve. In addition, the material of the battery explosion-proof valve towards the inside one side of the battery core is subjected to anticorrosive treatment, so that the corrosion of electrolyte, impurities or gas in the battery core on the material of the explosion-proof valve is avoided. Through the improvement, abnormal opening of the explosion-proof valve in the using process and rapid reduction of the explosion-proof pressure relief threshold value can be avoided.

Drawings

Fig. 1 is a schematic structural view of a battery explosion-proof valve in embodiment 1;

FIG. 2 is a schematic view showing the construction of a battery explosion-proof valve in embodiment 2;

FIG. 3 is a schematic structural view of a battery explosion-proof valve in embodiment 3;

FIG. 4 is a schematic structural view of a battery explosion-proof valve in embodiment 4;

fig. 5 is a schematic structural view of a battery top cover.

1. An explosion-proof valve ring; 2. an explosion-proof valve cover; 3. a positive post; 4. a negative pole post; 5. encoding bits; 6. an explosion-proof hole; 21. scoring; 22. a first bonnet stiffener; 23. a second valve cover reinforcing rib; 24. a connecting portion; 25. a first score reinforcement; 26. a second score reinforcement; 100. a battery explosion-proof valve; 200. and a battery top cover.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

The first embodiment is as follows:

referring to fig. 1-4, the battery explosion-proof valve 100 according to the present invention includes an explosion-proof valve ring 1 and an explosion-proof valve cover 2, wherein the explosion-proof valve ring 1 is disposed around the outer edge of the explosion-proof valve cover 2, and the explosion-proof valve cover 2 is provided with a notch 21. The anti-explosion valve ring 1 is a waist-shaped ring, the anti-explosion valve cover 2 is a sheet formed by metal punch forming, the nick 21 is formed by punch forming in the anti-explosion valve cover 2, the nick 21 is annularly arranged on the anti-explosion valve cover 2 and extends along the outer edge of the anti-explosion valve cover 2, and the shape of the nick 21 is the same as that of the anti-explosion valve ring 1. The thickness of the explosion-proof valve cover 2 at the nick 21 is smaller, and when the pressure in the battery cell reaches the safety pressure relief threshold value of the battery cell and needs to be timely exploded for pressure relief, the explosion-proof valve cover is easier to burst at the position.

With continued reference to fig. 1-4, the score 21 is provided with a score reinforcement portion, the thickness of the explosion-proof valve cover 2 at the score reinforcement portion is greater than the thickness of the explosion-proof valve cover 2 at the score 21, the score reinforcement portion is formed by punching from the explosion-proof valve cover 2, and the score reinforcement portion is disposed at a position of the explosion-proof valve cover 2 where the stress is greater. The notch reinforcing part is provided on the notch 21 on the opening side of the second valve cover reinforcing rib 23 or the notches 21 on both ends of the major axis of the explosion-proof valve cover 2, and is used for reinforcing the structural strength of the notch reinforcing part. Because the thickness of the explosion-proof valve cover 2 of nick rib department is greater than the thickness of the explosion-proof valve cover 2 of nick 21 department, through be provided with the nick rib that thickness is greater than nick 21 in the great position of stress, avoid the fracture to appear in the great position of stress on explosion-proof valve cover 2, solved the problem that the valve body crackle can appear under the condition that the interior gas pressure of electricity core does not reach the pressure release threshold value, protected the airtight function of battery explosion-proof valve 100.

Further, the battery explosion-proof valve 100 provided by the utility model further comprises a first valve cover reinforcing rib 22 and a second valve cover reinforcing rib 23, wherein the first valve cover reinforcing rib 22 and the second valve cover reinforcing rib 23 are arranged on the explosion-proof valve cover 2 and are positioned inside the nicks 21. In the present embodiment, the first and second valve

cover reinforcing ribs

22 and 23 are semicircular, and the first and second valve

cover reinforcing ribs

22 and 23 are symmetrical with respect to the long axis of the explosion-proof valve cover 2 and have opposite opening orientations. In this embodiment, the first and second valve

cover reinforcing ribs

22 and 23 are press-formed from the explosion-proof valve cover 2. The arrangement of the first valve cover reinforcing ribs 22 and the second valve cover reinforcing ribs 23 can prevent the battery explosion-proof valve 100 from deforming and cracking in the transportation process, can also avoid the tearing and too large explosion-proof value reduction caused by too large amplitude of the battery explosion-proof valve 100 in a breath test experiment, prevents the risk of deformation and cracking of the battery explosion-proof valve 100 in the production process, and prolongs the service life of the battery explosion-proof valve 100.

Further, the present invention provides a battery explosion-proof valve 100 further comprising a connecting portion 24, wherein the connecting portion 24 is located on the nick 21 on the opening side of the first valve cover reinforcing rib 22, and the thickness of the explosion-proof valve cover 2 at the connecting portion 24 is equal to the thickness of the explosion-proof valve cover 2.

In the embodiment, the thickness of the explosion-proof valve ring 1 is 0.3-2mm, the thickness of the explosion-proof valve cover 2 is 0.2-1mm, the thickness of the explosion-proof valve cover 2 at the positions of the first valve cover reinforcing rib 22 and the second valve cover reinforcing rib 23 is 0.1-1mm, the thickness of the explosion-proof valve cover 2 at the position of the nick 21 is 0.05-0.3mm, and the thickness of the explosion-proof valve cover 2 at the position of the nick reinforcing part is 0.1-0.3 mm. When the pressure in the battery core reaches the threshold value of the safety pressure relief of the battery core and needs to be opened in time for pressure relief, the nick 21 and the nick reinforcing part on the explosion-proof valve cover 2 can burst. Referring to fig. 1, in the present embodiment, the score reinforcing part includes a first score reinforcing part 25, the first score reinforcing part 25 is in a short strip shape, and the first score reinforcing part 25 is disposed at a middle position of the score 21 on the opening side of the second valve cover reinforcing rib 23.

In addition, the material of the inner side (i.e., the surface facing the inside of the battery cell) of the battery explosion-proof valve 100 is subjected to an anti-corrosion treatment, and the anti-corrosion treatment is performed by electrophoresis, an anodic oxidation pretreatment, fluorocarbon spraying, coating of an anti-corrosion material, and the like. The corrosion of electrolyte, impurities or gas in the battery cell to the material of the battery explosion-proof valve 100 is avoided, so that the abnormal opening of the battery explosion-proof valve 100 in the use process can be avoided.

Example two:

this embodiment is basically the same as the first embodiment, and is mainly different in the number and the arrangement positions of the score reinforcement parts. Referring to fig. 2, in the present embodiment, the score reinforcing part includes a first score reinforcing part 25 and a second score reinforcing part 26, the first score reinforcing part 25 and the second score reinforcing part 26 are in a short strip shape, and the first score reinforcing part 25 and the second score reinforcing part 26 are disposed on the score 21 on the opening side of the second valve cover reinforcing rib 23 and are close to two ends of the first valve cover reinforcing rib 23.

Example three:

this embodiment is substantially the same as the first embodiment, and is mainly different in the shape and the arrangement position of the score reinforcement portion. Referring to fig. 3, in the present embodiment, the score reinforcing portion includes a first score reinforcing portion 25, the first score reinforcing portion 25 is in a long shape, and the first score reinforcing portion 25 is disposed on the score 21 on the opening side of the second valve cover reinforcing rib 23, extends along the score 21 on the opening side of the second valve cover reinforcing rib 23, and extends from a position close to one end of the second valve cover reinforcing rib 23 to a position close to the other end of the second valve cover reinforcing rib 23.

Example four:

this embodiment is basically the same as the first embodiment, and is mainly different in the number and the arrangement positions of the score reinforcement parts. Referring to fig. 4, in the present embodiment, the score reinforcement portion includes a first score reinforcement portion 25 and a second score reinforcement portion 26, the first score reinforcement portion 25 and the second score reinforcement portion 26 are in a short strip shape, and the first score reinforcement portion 25 and the second score reinforcement portion 26 are respectively disposed on the scores 21 at two ends of the long axis of the explosion-proof valve cover 2.

Referring to fig. 5, the present invention further provides a battery top cap 200, which includes a positive post 3, a negative post 4, a coding bit 5, the battery explosion-proof valve 100, and an explosion-proof valve protection cover (not shown) disposed on the battery explosion-proof valve 100. Wherein, the positive pole column 3, the negative pole column 4 and the coding bit 5 are fixedly arranged on the battery top cover 200; the battery top cover 200 further includes an explosion-proof hole 6, and the battery explosion-proof valve 100 is fittingly installed in the explosion-proof hole 6.

The utility model also provides a battery, which comprises the battery top cover 200.

In summary, the battery explosion-proof valve 100 of the present application is provided with the notch reinforcement part at the position of the notch 21 where the stress is large, so as to reinforce the structural strength of the notch. The thickness of the explosion-proof valve cover 2 of nick rib department is greater than the thickness of the explosion-proof valve cover 2 of nick 21 department, avoid appearing the fracture in the great position of stress on the explosion-proof valve cover 2, can eliminate or weaken this battery explosion-proof valve 100 because the little crack risk that the respiratory effect of electric core charge-discharge inflation leads to in the use, the problem that the valve body crackle can appear under the condition that the internal gas pressure of electric core does not reach the pressure release threshold value has been solved, the airtight function of battery explosion-proof valve 100 has been protected. In addition, the material of the one side of battery explosion-proof valve 100 towards the inside of the battery core is subjected to anticorrosive treatment, so that the corrosion of electrolyte, impurities or gas in the battery core to the material of the explosion-proof valve is avoided. Through the improvement, abnormal opening of the explosion-proof valve in the using process and rapid reduction of the explosion-proof pressure relief threshold value can be avoided.

In this document, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms can be understood in a specific case to those of ordinary skill in the art.

As used herein, the ordinal adjectives "first", "second", "third", etc., used to describe an element are merely to distinguish between similar elements, and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

In this document, the terms "far", "near", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for the sake of clarity of the technical solutions and convenience of description, and thus, should not be construed as limiting the present invention.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A battery explosion-proof valve (100), characterized by: including explosion-proof valve ring (1) and explosion-proof valve gap (2), explosion-proof valve ring (1) encircles and locates the outer fringe of explosion-proof valve gap (2), be provided with nick (21) on explosion-proof valve gap (2), be provided with nick rib on nick (21), the thickness of explosion-proof valve gap (2) of nick rib department is greater than the thickness of explosion-proof valve gap (2) of nick (21) department.

2. The battery explosion-proof valve (100) of claim 1, wherein: still include first valve gap strengthening rib (22) and second valve cap strengthening rib (23), first valve gap strengthening rib (22) with second valve cap strengthening rib (23) set up on explosion-proof valve lid (2), just first valve gap strengthening rib (22) with second valve cap strengthening rib (23) about explosion-proof valve lid (2) major axis symmetry and opening orientation are opposite.

3. The battery explosion-proof valve (100) of claim 2, wherein: the notch reinforcing part is arranged on a notch (21) on the opening side of the second valve cover reinforcing rib (23) or notches (21) at two ends of the long shaft of the explosion-proof valve cover (2).

4. The battery explosion-proof valve (100) of claim 3, wherein: still include connecting portion (24), connecting portion (24) are located on nick (21) of the opening side of first valve gap strengthening rib (22), the thickness of explosion-proof valve lid (2) of connecting portion (24) department equals the thickness of explosion-proof valve lid (2).

5. The battery explosion-proof valve (100) of claim 1, wherein: the nick (21) is annularly arranged on the outer edge of the explosion-proof valve cover (2).

6. The battery explosion-proof valve (100) of claim 2, wherein: the first valve cover reinforcing rib (22) and the second valve cover reinforcing rib (23) are semicircular, and the first valve cover reinforcing rib (22) and the second valve cover reinforcing rib (23) are located inside the notch (21).

7. The battery explosion-proof valve (100) of claim 3, wherein: nick (21), nick rib reinforcement first valve gap strengthening rib (22) with second valve gap strengthening rib (23) stamping forming in on the explosion-proof valve gap (2).

8. The battery explosion-proof valve (100) of claim 4, wherein: the thickness of explosion-proof valve lid (1) is 0.3-2mm, the thickness of explosion-proof valve lid (2) is 0.2-1mm, the thickness of explosion-proof valve lid (2) of first valve lid strengthening rib (22) with second valve lid strengthening rib (23) department is 0.1-1mm, the thickness of explosion-proof valve lid (2) of nick (21) department is 0.05-0.3mm, the thickness of explosion-proof valve lid (2) of nick rib department is 0.1-0.3 mm.

9. A battery top cap (200), characterized by: comprising a positive post (3), a negative post (4) and the battery explosion-proof valve (100) according to any one of claims 1 to 8, the positive post (3), the negative post (4) and the battery explosion-proof valve (100) being fixedly mounted on the battery top cover (200).

10. A battery, characterized by: comprising a battery top cover (200) as claimed in claim 9.