A single cell

Abstract

The present invention relates to the technical field of battery safety, and specifically discloses a single cell battery, which includes a top cover; a safety valve, the safety valve is fixedly installed on the top cover, and a notch is provided on the safety valve. The notch is a connected ring shape. The inner side of the notch is the pressure relief part of the safety valve, and the outer side of the notch is the connection part of the safety valve to achieve rapid pressure relief; a connecting piece, the first end of the connecting piece is fixedly connected to the top cover, and the second end is fixedly connected to the safety valve. The connecting piece is used to keep the top cover and the pressure relief part of the safety valve connected when the pressure relief part of the safety valve completely detaches from the safety valve. By setting the ring-shaped notch and the connecting piece, when thermal runaway occurs inside the battery body, the safety valve can be completely torn to rapidly relieve pressure. At this time, the connecting piece can prevent the safety valve from completely detaching from the top cover and causing damage to the internal accessories of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery safety, and specifically to a single cell battery. Background Art

[0002] Currently, with the rapid development of new energy technologies, lithium batteries, as the core components for energy storage, are widely used in electric vehicles, portable electronic devices, and large-scale energy storage systems. However, an important safety issue faced by lithium batteries during use is thermal runaway, which may lead to a sharp increase in internal pressure, and further cause serious consequences such as battery swelling, leakage, and even explosion. In order to quickly discharge the internal flue gas when thermal runaway occurs, a safety valve is usually provided on the battery cover. The safety valve can be opened to discharge the internal flue gas of the battery. However, in order to prevent the safety valve from detaching from the cover and damaging the internal accessories of the battery pack, only part of the safety valve is provided with a notch. The notch can be opened for pressure relief, but there is always a part of the safety valve that cannot be opened. As a result, the pressure relief rate of the battery is affected, and danger is likely to occur. Therefore, designing a battery cover that can quickly respond to internal thermal runaway of the battery, ensure rapid pressure relief when the pressure reaches a dangerous threshold, and at the same time can control the dynamic behavior of the safety valve during the opening process to prevent it from flying off and causing additional hazards is an urgent problem to be solved in battery technology. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery safety valve to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A single cell battery, comprising:

[0006] A cover;

[0007] A safety valve, which is fixedly installed on the cover. The safety valve is provided with a notch, and the notch is a continuous ring shape. The inner side of the notch is the pressure relief part of the safety valve, and the outer side of the notch is the connection part of the safety valve. The pressure relief part of the safety valve is used to tear along the notch and completely detach from the safety valve under the action of the internal flue gas of the battery to achieve rapid pressure relief;

[0008] A connecting member, the first end of the connecting member is fixedly connected to the cover, and the second end is fixedly connected to the safety valve. The connecting member is used to keep the cover and the pressure relief part of the safety valve connected when the pressure relief part of the safety valve completely detaches from the safety valve.

[0009] Optionally, the cover is provided with an installation hole, and a first inner groove opening is provided at the top of the installation hole. The first end of the connecting member is fixedly connected in the first inner groove opening.

[0010] Optionally, a second inner groove opening is provided at the bottom of the mounting hole, and the safety valve is fixedly installed in the second inner groove opening.

[0011] Optionally, the connecting member is a flexible connecting component.

[0012] Optionally, the maximum length of the connecting member is less than the maximum displacement distance of the safety valve.

[0013] Optionally, the mounting hole is provided at the center of the top cover.

[0014] Optionally, the notch is provided on the side of the safety valve away from the top cover.

[0015] Optionally, the notch can be one of a trapezoid or an inverted V shape.

[0016] Optionally, when the notch is in an inverted V shape, the included angle between the inner walls of the notch is between 30° and 45°.

[0017] Optionally, the thickness of the notch is 0.1 - 0.5 times the thickness of the safety valve.

[0018] The present invention has at least the following beneficial effects:

[0019] In this solution, by providing a safety valve with an annular notch, when thermal runaway occurs inside the battery body, the flue gas inside the battery impacts the top cover. At this time, the bottom of the safety valve is subjected to pressure, causing the gas inside the battery to completely tear the safety valve along the notch, thereby opening a larger opening, which can quickly release pressure in an emergency. At the same time, the movement of the safety valve is controlled by the connecting member to prevent the safety valve from flying out and damaging the internal accessories of the battery pack, which can effectively protect the safety of the battery pack while achieving rapid pressure relief, significantly improving the safety and reliability of battery use. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the top cover of the present invention;

[0023] Figure 3 It is a schematic structural diagram of the safety valve of the present invention;

[0024] Figure 4Schematic diagram of the partial cross-section structure at the mounting hole of the top cover of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the present invention when the notch at the bottom of the safety valve is an inverted V shape;

[0026] Figure 6 Schematic diagram of the structure of the present invention when the notch at the bottom of the safety valve is a trapezoid.

[0027] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0028] 1. Battery body; 101. Protective housing; 102. Battery core; 103. Top cover; 1031. Mounting hole; 10311. First inner groove opening; 10312. Second inner groove opening; 2. Connecting piece; 3. Safety valve; 301. Notch. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1-6 , the present invention discloses a single battery, including: a top cover 103; a safety valve 3, the safety valve 3 is fixedly installed on the top cover 103, a notch 301 is opened on the safety valve 3, the notch 301 is a connected ring shape, the inner side of the notch 301 is the pressure relief part of the safety valve 3, the outer side of the notch 301 is the connecting part of the safety valve 3, and the pressure relief part of the safety valve 3 is used to tear along the notch 301 and completely separate from the safety valve 3 under the action of the flue gas in the battery to achieve rapid pressure relief; a connecting piece 2, the first end of the connecting piece 2 is fixedly connected to the top cover 103, and the second end is fixedly connected to the safety valve. The connecting piece 2 is used to keep the top cover 103 and the pressure relief part of the safety valve 3 connected when the pressure relief part of the safety valve 3 completely separates from the safety valve 3.

[0031] In this embodiment, when thermal runaway occurs in the battery body, the flue gas inside the battery impacts the top cover. At this time, the bottom of the safety valve is under pressure, causing the gas in the battery to completely tear the safety valve along the notch, thereby opening a larger opening, which can quickly release pressure in an emergency. At the same time, the movement of the safety valve is controlled by the connecting piece to prevent the safety valve from flying out and damaging the internal accessories of the battery pack, which can effectively protect the safety of the battery pack while achieving rapid pressure relief, and significantly improve the safety and reliability of battery use.

[0032] In some embodiments, referring to Figure 1 , Figure 2 , the battery body 1 includes a protective housing 101 and a battery core 102. The battery core 102 is installed inside the protective housing 101, and the top cover 103 is fixedly installed on the top of the protective housing 101. The battery core 102 is a battery cell formed by winding. The protective housing 101 is mainly used to protect necessary components such as the internal battery core 102, and the material of the protective housing 101 can be selected from one of aluminum alloy, polypropylene or polycarbonate.

[0033] The battery core 102 is placed inside the protective housing 101 to ensure the stability of the electrochemical performance.

[0034] In some embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , a mounting hole 1031 is provided at the center inside the top cover 103. The mounting hole 1031 is oblong. A first inner groove opening 10311 is provided at the top of the mounting hole 1031, and a second inner groove opening 10312 is provided at the bottom of the mounting hole 1031. The safety valve 3 is fixedly installed on the inner wall of the second inner groove opening 10312. The first end of the connecting member 2 is fixedly connected to the inner wall of the first inner groove opening 10311, and the second end of the connecting member 2 is fixedly connected to the top of the safety valve 3. By setting the mounting hole 1031 as an oblong hole, the exhaust area can be increased, so that the pressure relief rate is higher. By providing the second inner groove opening 10312, it can be used to install the safety valve 3. By providing the first inner groove opening 10311, it can be used to install the connecting member 2. By providing the connecting member 2, the safety valve 3 can be pulled to prevent the safety valve 3 from flying out directly and detaching from the top cover 103 during pressure relief.

[0035] It should be noted that the first end of the connecting member 2 is fixed to the inner wall of the first inner groove opening 10311 inside the top cover 103 by welding or bonding, and the second end is also fixed to the top of the safety valve 3. The length of the connecting member 2 needs to be just right, which can not only effectively limit the flying distance of the safety valve 3 when it is opened for pressure relief, but also does not affect the normal pressure relief process. Specifically, the maximum length of the connecting member 2 is less than the maximum displacement distance allowed by the safety valve 3.

[0036] The top cover 103 is fixedly installed on the top of the protective housing 101. A long oblong mounting hole 1031 is provided at the center inside the top cover. The first inner groove opening 10311 at the top of the mounting hole and the second inner groove opening 10312 at the bottom reserve space for the installation of the safety valve 3 and the connecting member 2.

[0037] The safety valve 3 is fixedly installed on the inner wall of the second inner groove opening 10312 to ensure that it is exactly above the top of the battery core 102. Subsequently, both ends of the connecting member 2 are firmly fixed to the first inner groove opening 10311 and the top of the safety valve 3, completing the integration of the entire safety valve system.

[0038] Among them, the connecting member 2 is preferably a flexible connecting component, such as a spring, a steel wire rope or a high-strength rope. The length of the connecting member 2 can be set according to the maximum displacement distance of the safety valve 3, and it is only necessary to prevent the pressure relief part of the safety valve 3 from colliding with the internal accessories of the battery pack.

[0039] In some embodiments, referring to Figure 5 , Figure 6 , the notch 301 can be one of a trapezoid or an inverted V shape. When the notch 301 is in the shape of an inverted V, the inner wall angle of the notch 301 is between 30° and 45°. By setting the inner wall angle of the inverted V to be between 30° and 45°, the notch 301 in the shape of an inverted V is easier to tear. Since the pressures on each part of the safety valve 3 are different, in order to make the safety valve 3 open as much as possible at the same time, for example, the notch 301 on the two arc parts where the pressure is small is thinner, and the notch 301 on the middle straight part is thicker, so that the safety valve 3 can be fully opened. By setting the notch 301 to be a trapezoid or an inverted V shape, the notch 301 can be more easily torn. The depth of the notch 301 is 0.1 - 0.5 times the thickness of the safety valve 3, ensuring that the safety valve 3 will not be torn due to the vibration of the battery pack, and can be torn and relieved of pressure under the action of the internal flue gas pressure.

[0040] In some embodiments, referring to Figure 5 , Figure 6 , the overall shape of the notch 301 is annular, and the safety valves 3 are all oblong holes, so that the notch 301 can adapt to the shape of the safety valve 3, and the area surrounded by the notch 301 is as large as possible, so as to facilitate the gas in the battery to tear the safety valve 3 along the notch 301, achieving the effect of rapid pressure relief.

[0041] Working principle: When thermal runaway occurs inside the battery body 1 during use, the battery core 102 inside the protective housing 101 generates heat and produces gas. The flue gas accumulates inside the protective housing 101 and impacts the top cover 103. At this time, the bottom of the safety valve 3 is under pressure. By setting a notch 301 at the bottom of the safety valve 3, the gas inside the battery tears the safety valve 3 along the notch 301. By making the arc-shaped parts on both sides of the notch 301 thinner and the middle straight part thicker, the safety valve 3 can be opened as simultaneously as possible along the notch 301 after being under pressure. And by setting a circular notch 301, the safety valve 3 can be almost completely opened to achieve the effect of rapid pressure relief. At the same time, by installing a connecting piece 2 on the inner wall of the first inner groove opening 10311 according to the maximum displacement distance of the safety valve 3, the safety valve 3 can be pulled to prevent the safety valve 3 from flying out directly and detaching from the top cover 103 during pressure relief, thereby preventing the safety valve 3 from splashing and affecting the internal accessories of the battery pack.

[0042] During the pressure relief process, the connecting piece 2 plays a crucial safety control role. Its first end is fixed to the first inner groove opening 10311 of the top cover 103, and the second end is fixed to the top of the safety valve 3, ensuring that when the safety valve is torn and opened for pressure relief by the pressure, its moving distance can be effectively limited, preventing the safety valve from completely detaching from the battery top cover due to inertia or excessive air pressure impact, causing potential safety hazards or damaging surrounding equipment.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single cell battery, characterized in that: include: Top cover (103); A safety valve (3), the safety valve (3) being fixedly mounted on the top cover (103), the safety valve (3) being provided with a notch (301), the notch (301) being a connected ring, the inner side of the notch (301) being a pressure relief portion of the safety valve (3), the outer side of the notch (301) being a connecting portion of the safety valve (3), the pressure relief portion of the safety valve (3) being used to tear along the notch (301) under the action of smoke in the battery and completely detach from the safety valve (3), so as to achieve rapid pressure relief; a connecting member (2), wherein a first end of the connecting member (2) is fixedly connected to the top cover (103), and a second end of the connecting member (2) is fixedly connected to the safety valve (3), and the connecting member (2) is used to maintain the connection between the top cover (103) and the pressure relief part of the safety valve (3) when the pressure relief part of the safety valve (3) is completely separated from the safety valve (3); The connecting member (2) is a flexible connecting member; The flexible connection member is a spring or a steel wire rope or a high-strength rope; The maximum length of the connecting piece (2) is smaller than the maximum displacement distance of the safety valve (3).

2. The single cell according to claim 1, characterized in that: The top cover (103) is provided with a mounting hole (1031), the top of the mounting hole (1031) is provided with a first inner groove opening (10311), and the first end of the connecting member (2) is fixedly connected in the first inner groove opening (10311).

3. The single cell according to claim 2, characterized in that: A second inner groove opening (10312) is provided at the bottom of the mounting hole (1031), and the safety valve (3) is fixedly mounted in the second inner groove opening (10312).

4. The single cell according to claim 2, characterized in that: The mounting hole (1031) is arranged at the center of the top cover (103).

5. The single cell according to claim 1, characterized in that: The notch (301) is arranged on a side of the safety valve (3) away from the top cover (103).

6. The single cell according to claim 5, characterized in that: The notch (301) may be in the shape of a trapezoid or an inverted V.

7. The single cell according to claim 6, characterized in that: When the notch (301) is in an inverted V shape, the inner wall angle of the notch (301) is between 30° and 45°.

8. The single cell according to claim 7, characterized in that: The thickness of the notch (301) is 0.1-0.5 times the thickness of the safety valve (3).

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