Lithium battery of preventing electrolyte leakage

Abstract

The utility model provides a prevent electrolyte leakage type lithium cell relates to lithium cell protection technical field, including lithium cell shell, the positive pole interface is equipped with to lithium cell shell front end, the negative pole interface is equipped with to lithium cell shell front end, the pressure relief group piece is equipped with to lithium cell shell front end, the pressure relief group piece includes fixed disc, the fixed disc surface is fixed with fixed pin, the fixed disc is connected with lithium cell shell fixedly through fixed pin, the fixed disc inner wall is fixed with the communicating pipe, the communicating pipe inner wall is set up with the hole groove, the hole groove upper end surface is connected with the communicating groove, the movable air plug is slidably connected in the communicating groove, the movable air plug upper end surface is fixed with high pressure spring, high pressure spring other end is connected with the communicating groove top fixedly, the communicating groove upper end is connected with the pressure relief hole, through being additionally established pressure relief group piece in the lithium cell, thereby realizes the explosion of avoiding lithium cell because of high pressure, causes the personnel casualty.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery protection technology, and in particular to a lithium battery designed to prevent electrolyte leakage. Background Technology

[0002] With the development of microelectronics technology and the increasing number of devices, high demands are being placed on power supplies. Lithium batteries are widely used due to their superior energy storage and charging performance. Their internal structure mainly consists of a positive electrode film, a diaphragm, and a negative electrode film bonded together, forming the inner core film. This inner core film is rolled or folded into a layered structure and located inside the battery casing.

[0003] In existing technologies, lithium batteries are considered high-energy batteries. They have the advantage of high energy storage density, which is about 6-7 times that of lead-acid batteries. They also have a long service life, which can reach more than 6 years. They have a very low self-discharge rate and are lightweight, making them convenient to use. However, some lithium batteries use a fully sealed outer protective shell for better overall sealing. This can prevent high-pressure gas from escaping, which can eventually lead to an explosion and affect the lifespan of the lithium battery. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lithium battery that prevents electrolyte leakage.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: It includes a lithium battery casing, with a positive terminal interface and a negative terminal interface at the front end of the lithium battery casing. A pressure relief block is also provided at the front end of the lithium battery casing. The pressure relief block includes a fixed disc, with a fixing pin fixed to its surface. The fixed disc is fixedly connected to the lithium battery casing via the fixing pin. A connecting pipe is fixed to the inner wall of the fixed disc, and a slot is formed in the inner wall of the connecting pipe. A connecting groove is connected to the upper end of the slot. A movable air plug is slidably connected inside the connecting groove. A high-pressure spring is fixed to the upper end of the movable air plug, and the other end of the high-pressure spring is fixedly connected to the top of the connecting groove. A pressure relief hole is connected to the upper end of the connecting groove. In the prior art, lithium batteries are a type of high-energy battery. It boasts a high energy storage density, several times that of lead-acid batteries, a long service life exceeding 100 years, a very low self-discharge rate, and a lightweight design, making it convenient to use. However, some existing lithium batteries employ a fully sealed outer protective casing for optimal sealing, preventing the release of high-pressure gas and potentially leading to explosions over time, thus affecting the battery's lifespan. By adding a pressure relief block inside the lithium battery, when the internal pressure exceeds the rated pressure, the high pressure pushes the movable air plug forward along the pressure relief device's groove. The pressurized gas is then released through the connecting hole and pressure relief hole. When the pressure returns to normal, the high-pressure spring pushes the movable air plug back to its original position, thereby preventing the lithium battery from exploding due to high pressure and causing personal injury.

[0006] Preferably, the upper surface of the lithium battery casing has a square groove, and a fixing plate is detachably connected to the inside of the square groove by bolts. The front end of the lithium battery casing has a hole, and a fixing ring is fixed to the inner wall of the hole. The lithium battery casing is detachably connected to a positive terminal interface through the fixing plate, and a negative terminal interface is detachably installed on the lithium battery casing through the fixing plate. In the prior art, when the lithium battery is subjected to significant vibration, the terminal post is prone to vertical movement relative to the inner plug of the seal, which can create gaps between the terminal post and the inner plug of the seal, leading to electrolyte leakage and potential fire. This utility model uses a fixing ring and a fixing plate to fix the lithium battery terminal post, and utilizes the high roughness of the fixing plate itself and the pressure adjustment of the fixing plate to prevent electrolyte leakage when the lithium battery is subjected to significant vibration.

[0007] Preferably, the lithium battery casing has heat dissipation holes on both sides to increase the heat dissipation of the lithium battery, thereby reducing the risk of fire caused by high battery temperature.

[0008] Preferably, the surface of the fixing ring is provided with an anti-slip rubber sleeve, which, through its high adaptability, further improves the electrolyte sealing performance.

[0009] Preferably, the lithium battery casing material is a durable and impact-resistant material, which prevents damage caused by impacts during lithium battery operation.

[0010] Preferably, the inner diameter of the fixing ring is smaller than the outer diameter of the positive terminal interface, and the inner diameter of the fixing ring is smaller than the outer diameter of the negative terminal interface. By making the diameter of the fixing ring smaller than the diameter of the interface, the interface is more stable during installation.

[0011] Preferably, the diameter of the connecting groove is larger than the diameter of the hole groove. By making the diameter of the connecting groove larger than that of the hole groove, the movement of the movable air plug becomes smoother.

[0012] Beneficial effects

[0013] 1. In existing technologies, lithium batteries are characterized by high energy density, approximately 6-7 times that of lead-acid batteries, long service life (up to 6 years or more), low self-discharge rate, and lightweight design, making them convenient to use. However, some lithium batteries employ a fully sealed outer casing for better overall sealing, which prevents high-pressure gas from escaping and can eventually lead to explosion, affecting the battery's lifespan. By adding a pressure relief block inside the lithium battery, when the internal pressure exceeds the rated pressure, the high pressure pushes the movable gas plug forward along the pressure relief device's groove. The pressurized gas is then discharged through the connecting hole and pressure relief hole. When the pressure returns to normal, the high-pressure spring pushes the movable gas plug back to its original position, thus preventing the lithium battery from exploding due to high pressure and causing personal injury.

[0014] 2. In the prior art, when lithium batteries are subjected to significant vibration, the terminals are prone to vertical movement relative to the inner seal, which can create gaps between the terminals and the inner seal, leading to electrolyte leakage and potentially causing a fire. This invention uses a fixing ring and a fixing plate to fix the lithium battery terminals. By utilizing the high roughness of the fixing plate and the pressure adjustment of the fixing plate, the leakage of electrolyte from the lithium battery when subjected to significant vibration is prevented. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the pressure relief block of this utility model;

[0017] Figure 3 This is a schematic diagram of the fixing structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the interface of this utility model.

[0019] Legend:

[0020] 1. Lithium battery casing; 2. Positive terminal interface; 3. Negative terminal interface; 4. Pressure relief block; 5. Fixing disc; 6. Fixing pin; 7. Connecting pipe; 8. Hole and slot; 9. Connecting groove; 10. Movable air plug; 11. High-pressure spring; 12. Pressure relief hole; 13. Square groove; 14. Fixing piece; 15. Fixing ring; 16. Heat dissipation hole. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0022] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific implementation examples:

[0024] Reference Figure 1-4 A lithium battery designed to prevent electrolyte leakage includes a lithium battery casing 1, a positive terminal interface 2 and a negative terminal interface 3 at the front end of the lithium battery casing 1, and a pressure relief block 4 at the front end of the lithium battery casing 1. The pressure relief block 4 includes a fixed disc 5, a fixing pin 6 fixed to the surface of the fixed disc 5, and the fixed disc 5 is fixedly connected to the lithium battery casing 1 through the fixing pin 6. A connecting pipe 7 is fixed to the inner wall of the fixed disc 5, and a slot 8 is opened in the inner wall of the connecting pipe 7. A connecting groove 9 is connected to the upper end of the slot 8. A movable air plug 10 is slidably connected inside the connecting groove 9. A high-pressure spring 11 is fixed to the upper end of the movable air plug 10, and the other end of the high-pressure spring 11 is fixedly connected to the top of the connecting groove 9. A pressure relief hole 12 is connected to the upper end of the connecting groove 9. The lithium battery casing 1 is made of a durable and impact-resistant material, and the diameter of the connecting groove 9 is larger than the diameter of the slot 8.

[0025] The upper surface of the lithium battery casing 1 has a square groove 13, and a fixing plate 14 is detachably connected to the inside of the square groove 13 by bolts. The front end of the lithium battery casing 1 has a hole, and a fixing ring 15 is fixed to the inner wall of the hole. The positive terminal interface 2 is detachably connected to the lithium battery casing 1 through the fixing plate 14. The negative terminal interface 3 is detachably installed on the lithium battery casing 1 through the fixing plate 14. Heat dissipation holes 16 are provided on both sides of the lithium battery casing 1. The surface of the fixing ring 15 is provided with an anti-slip rubber sleeve. The inner diameter of the fixing ring 15 is smaller than the outer diameter of the positive terminal interface 2 and the inner diameter of the fixing ring 15 is smaller than the outer diameter of the negative terminal interface 3.

[0026] In existing technologies, lithium batteries are characterized by high energy density, several times that of lead-acid batteries, long service life (up to six years or more), low self-discharge rate, and light weight, making them convenient to use. However, some lithium batteries use a fully sealed outer casing for better overall sealing, which prevents high-pressure gas from escaping and can eventually lead to explosion, affecting the battery's lifespan. By adding a pressure relief block 4 inside the lithium battery, when the internal pressure exceeds the rated pressure, the high pressure pushes the movable air plug 10 forward along the pressure relief device slot 8. The pressurized gas is then discharged through the connecting hole and pressure relief hole 12. When the pressure returns to normal, the high-pressure spring 11 pushes the movable air plug 10 back to its original position, thus preventing the lithium battery from exploding due to high pressure and causing personal injury.

[0027] The working principle of this utility model is as follows: When the internal pressure of the lithium battery exceeds the rated pressure, the high pressure pushes the movable air plug 10 forward along the pressure relief device groove 8, and the pressurized gas is discharged through the connecting hole and the pressure relief hole 12. When the pressure returns to normal, the high pressure spring 11 pushes the movable air plug 10 back to its original position, thereby controlling the internal pressure of the lithium battery.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lithium battery designed to prevent electrolyte leakage, comprising a lithium battery casing (1), wherein the front end of the lithium battery casing (1) is provided with a positive electrode interface (2) and the front end of the lithium battery casing (1) is provided with a negative electrode interface (3), characterized in that: The front end of the lithium battery casing (1) is provided with a pressure relief block (4). The pressure relief block (4) includes a fixed disc (5). A fixing pin (6) is fixed on the surface of the fixed disc (5). The fixed disc (5) is fixedly connected to the lithium battery casing (1) through the fixing pin (6). A connecting pipe (7) is fixed on the inner wall of the fixed disc (5). A hole groove (8) is opened on the inner wall of the connecting pipe (7). A connecting groove (9) is connected to the upper end of the hole groove (8). A movable air plug (10) is slidably connected inside the connecting groove (9). A high-pressure spring (11) is fixed on the upper end of the movable air plug (10). The other end of the high-pressure spring (11) is fixedly connected to the top of the connecting groove (9). A pressure relief hole (12) is connected to the upper end of the connecting groove (9).

2. The electrolyte leakage-proof lithium battery according to claim 1, characterized in that: The upper surface of the lithium battery casing (1) is provided with a square groove (13), and a fixing plate (14) is fixed inside the square groove (13) by bolts. The front end of the lithium battery casing (1) is provided with a hole, and a fixing ring (15) is fixed to the inner wall of the hole. The lithium battery casing (1) is detachably connected to a positive electrode interface (2) through the fixing plate (14), and the lithium battery casing (1) is detachably installed with a negative electrode interface (3) through the fixing plate (14).

3. The electrolyte leakage-proof lithium battery according to claim 1, characterized in that: The lithium battery casing (1) has heat dissipation holes (16) on both sides.

4. The electrolyte leakage-proof lithium battery according to claim 2, characterized in that: The surface of the fixed ring (15) is provided with an anti-slip rubber sleeve.

5. The electrolyte leakage-proof lithium battery according to claim 1, characterized in that: The lithium battery casing (1) is made of a durable and impact-resistant material.

6. The electrolyte leakage-proof lithium battery according to claim 2, characterized in that: The inner diameter of the fixed ring (15) is smaller than the outer diameter of the positive terminal interface (2), and the inner diameter of the fixed ring (15) is smaller than the outer diameter of the negative terminal interface (3).

7. The electrolyte leakage-proof lithium battery according to claim 1, characterized in that: The diameter of the connecting groove (9) is larger than the diameter of the hole groove (8).

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