Lithium battery explosion-proof cover plate with positive electrode conduction and pressure relief function

Abstract

The utility model provides a lithium battery explosion -proof cover plate with positive electrode conductivity and pressure -relief function relates to battery cover plate technical field, including battery component, battery component top surface is equipped with explosion -proof cover plate, the surface of explosion -proof cover plate is equipped with pressure -relief valve, the surface of explosion -proof cover plate is equipped with first pressure -relief groove, adopts pressure -relief valve, first pressure -relief groove and second pressure -relief hole, when the pressure weakly rises because of slight overcharge or temperature rise inside the battery, the silica gel membrane of elastic pressure -relief valve is slightly opened to the outside under pressure, a small amount of gas is released, after pressure reduction, spring pulls back valve body reset, keeps the integrity and sealability of explosion -proof cover plate, is applicable to repeatedly low pressure scene, when the internal pressure rapidly rises because of violent impact, short circuit or serious overcharge of battery, high pressure acts on stress first pressure -relief groove and second pressure -relief hole, the groove breaks down because of thin wall and stress concentration and is preferentially broken, forms directional pressure -relief passage, releases gas fast, avoids whole explosion and flies, reduces the harm to surrounding environment and personnel.

Description

Technical Field

[0001] This utility model relates to the field of battery cover technology, and in particular to an explosion-proof cover for lithium batteries with positive electrode conductivity and pressure relief functions. Background Technology

[0002] According to the utility model disclosed in Chinese Patent Publication No. CN208608238U, an explosion-proof lithium battery cover plate includes a battery anode, a battery cathode, a cover plate reinforcing plate, fixing bolts, a battery cover plate, a handle hinge, a battery handle, an explosion-proof lithium battery, a battery reinforcing plate, a battery base, a control button, a control panel, indicator lights, and a display screen. This utility model provides an explosion-proof lithium battery cover plate. By rotating a control knob, the control knob drives the knob base to rotate. When the knob base rotates, it drives the transmission threaded rod to rotate, causing the threaded transmission gear to move on the transmission threaded rod. The moving threaded transmission gear drives the transmission rod to move through the transmission rod connecting block. When the transmission rod moves, it pulls the battery fixing block, causing the battery fixing block to retract under the restriction of the limit block against the thrust of the return spring, thus loosening its fixation to the battery and facilitating opening for maintenance.

[0003] The aforementioned documents and existing technologies have the following technical problems: When the internal pressure of existing lithium battery explosion-proof covers rises abnormally, the pressure relief mechanism often fails to respond in a timely manner or is too simplistic, leading to the overall explosion of the battery, which poses a safety hazard and increases the risk of personal injury and equipment damage. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lithium battery explosion-proof cover with positive electrode conductivity and pressure relief functions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function, comprising a battery assembly, an explosion-proof cover provided on the top surface of the battery assembly, a pressure relief valve provided on the surface of the explosion-proof cover, a first pressure relief groove provided on the surface of the explosion-proof cover, a second pressure relief hole provided on the surface of the explosion-proof cover, a terminal post provided on the surface of the explosion-proof cover, and a conductive post provided on the bottom surface of the explosion-proof cover, wherein the terminal post is electrically connected to the conductive post.

[0006] Preferably, the battery assembly includes a lithium battery body and a battery management system (BMS), with the BMS located on the side of the lithium battery body.

[0007] Preferably, the surface of the lithium battery body is provided with a positive electrode, and the shape and position of the conductive pillar are adapted to the positive electrode.

[0008] Preferably, the terminal is positioned above the conductive post, and the terminal is electrically connected to the lithium battery body through the conductive post.

[0009] Preferably, the explosion-proof cover has mounting holes on its surface, and mounting bolts are provided on the surface of the mounting holes.

[0010] Preferably, the lithium battery body and the battery management system (BMS) are electrically connected, and the first pressure relief groove and the second pressure relief hole are located above the lithium battery body.

[0011] Preferably, the four sides of the explosion-proof cover are rounded, and the shape and position of the explosion-proof cover correspond to the battery assembly.

[0012] Beneficial effects In this invention, a pressure relief valve, a first pressure relief groove, and a second pressure relief hole are used. When the internal pressure of the battery increases slightly due to a minor overcharge or temperature rise, the silicone diaphragm of the elastic pressure relief valve is pressed and slightly opens outward to release a small amount of gas. After the pressure decreases, the spring pulls the valve body back to its original position, maintaining the integrity and sealing of the explosion-proof cover. This is suitable for repeated low-pressure scenarios. When the internal pressure of the battery rises rapidly due to a violent impact, short circuit, or severe overcharge, the high pressure acts on the stress of the first pressure relief groove and the second pressure relief hole. The groove ruptures preferentially due to its thin wall and stress concentration, forming a directional pressure relief channel to quickly release gas, preventing the battery from exploding and reducing harm to the surrounding environment and personnel. The explosion-proof cover is for single use and needs to be replaced, but the low-pressure relief valve can be reset and reused multiple times, balancing economy and safety. Attached Figure Description

[0013] Figure 1 This is an axonometric view of the present invention; Figure 2 This is a perspective view of the present utility model; Figure 3 This is a top view of the present invention; Figure 4 This is an exploded view of the present invention.

[0014] Legend: 1. Battery assembly; 101. Lithium battery body; 102. Battery management system (BMS); 2. Explosion-proof cover; 3. Pressure relief valve; 4. First pressure relief groove; 5. Second pressure relief hole; 6. Positive electrode; 7. Conductive post; 8. Mounting hole; 9. Mounting bolt; 10. Terminal post. Detailed Implementation

[0015] 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.

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1: Reference Figure 1-4 A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function includes a battery assembly 1. The battery assembly 1 includes a lithium battery body 101 and a battery management system (BMS) 102. The BMS 102 is located on the side of the lithium battery body 101. The lithium battery body 101 and the BMS 102 are electrically connected. The battery assembly 1 serves as the mounting base for the explosion-proof cover 2. It includes the lithium battery body 101 and the BMS 102 and is responsible for the energy storage and management system of the lithium battery body 101. The lithium battery body 101 is the core part of the battery assembly 1, which stores energy and generates internal pressure changes. The BMS 102 is electrically connected to the lithium battery body 101 and is responsible for monitoring the battery status and controlling the safe operation of the lithium battery body 101 through signals.

[0018] The top surface of the battery assembly 1 is provided with an explosion-proof cover 2. The four sides of the explosion-proof cover 2 are rounded. The shape and position of the explosion-proof cover 2 correspond to the battery assembly 1. The surface of the explosion-proof cover 2 is provided with mounting holes 8. The surface of the mounting holes 8 is provided with mounting bolts 9. The battery body 101 and the battery management system BMS 102 are provided with threaded holes at positions corresponding to the mounting holes 8. The shape and position of the explosion-proof cover 2 correspond to the battery assembly 1. It plays the role of sealing the lithium battery body 101, providing conductivity and pressure relief for the positive electrode 6 [1]. The explosion-proof cover 2 is for single use and needs to be replaced to ensure overall safety after high pressure relief. Through the mounting holes 8 and mounting bolts 9, the explosion-proof cover 2 is firmly connected to the battery assembly 1 to maintain structural stability.

[0019] The explosion-proof cover 2 is equipped with a pressure relief valve 3. This valve is an elastic pressure relief valve, employing a silicone diaphragm and spring structure, and is installed on the surface of the explosion-proof cover 2. When the internal pressure of the lithium battery body 101 slightly increases due to minor overcharging or temperature rise, the silicone diaphragm is pressed open slightly to release a small amount of gas. After the pressure decreases, the spring pulls the valve back to its original position, maintaining the integrity and sealing of the explosion-proof cover 2. This design is suitable for repeated low-pressure scenarios. The surface of the explosion-proof cover 2 has a first pressure relief groove 4 and a second pressure relief hole 5. The first pressure relief groove 4 and the second pressure relief hole 5 are located above the lithium battery body 101. These are designed as thin-walled stress concentration areas. When the internal pressure of the lithium battery body 101 rises rapidly and the pressure relief valve 3 cannot release pressure in time, the first pressure relief groove 4 and the second pressure relief hole 5 rupture under stress concentration, forming a directional pressure relief channel to release gas, preventing the entire battery from exploding and reducing the impact on the surrounding environment and personnel. The explosion-proof cover 2 has terminals 10 on its surface and conductive posts 7 on its bottom surface. Terminals 10 and conductive posts 7 are electrically connected. The lithium battery body 101 has a positive electrode 6 on its surface. The shape and position of the conductive posts 7 are adapted to the positive electrode 6. Terminals 10 are located above the conductive posts 7 and are electrically connected to the lithium battery body 101 through the conductive posts 7. The terminals 10 and conductive posts 7 serve as a connection interface for external circuits, transmitting the electrical energy of the lithium battery body 101 to external loads or charging devices through the conductive posts 7. The conductive posts 7 are electrically connected to the positive electrode 6 and the terminals 10, forming a current output path for the positive electrode 6, ensuring normal battery operation. The positive electrode 6, as the positive terminal for the electrical energy output of the lithium battery body 101, is matched and connected to the conductive posts 7 to transmit internal electrical energy to the conductive system of the explosion-proof cover 2. The negative terminal for the electrical energy output of the lithium battery body 101 can be directly led out from the side or bottom. Specific Implementation Example 2: A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function is disclosed based on the basic structure in Specific Embodiment 1. The operation of the device is as follows: When the internal pressure of the lithium battery body 101 increases slightly due to slight overcharging or temperature rise, the silicone diaphragm of the elastic pressure relief valve 3 is pressed and slightly opens outward to release a small amount of gas to relieve the pressure. After the pressure decreases, the spring pulls back the valve body to reset, maintaining the integrity and sealing of the explosion-proof cover 2. It is suitable for repeated low-pressure scenarios. When the internal pressure of the lithium battery body 101 increases rapidly due to violent impact, short circuit or severe overcharging, the high pressure acts on the first pressure relief groove 4 and the second pressure relief hole 5. These thin-walled stress concentration areas break first, forming a directional pressure relief channel to quickly release gas and prevent the explosion-proof cover 2 from being blown away or causing harm to the surrounding environment and personnel. During this process, the terminal 10 is electrically connected to the positive electrode 6 through the conductive post 7 to ensure that electrical energy is continuously transmitted to the external load or charging equipment. The explosion-proof cover 2 is a disposable structure that needs to be replaced after high pressure relief, thus taking into account both economy and safety.

[0021] In summary: Employing a pressure relief valve 3, a first pressure relief groove 4, and a second pressure relief hole 5, when the internal pressure of the lithium battery body 101 slightly increases due to minor overcharging or temperature rise, the silicone diaphragm of the elastic pressure relief valve 3 is pressed open slightly outward, releasing a small amount of gas. After the pressure decreases, the spring pulls the valve body back to reset, maintaining the integrity and sealing of the explosion-proof cover 2. This is suitable for repeated low-pressure scenarios. When the internal pressure of the lithium battery body 101 rises rapidly due to violent impact, short circuit, or severe overcharging, the high pressure acts on the stress of the first pressure relief groove 4 and the second pressure relief hole 5. The groove ruptures preferentially due to its thin wall and stress concentration, forming a directional pressure relief channel to quickly release gas, preventing the entire battery from exploding and reducing harm to the surrounding environment and personnel. The explosion-proof cover 2 is for single use and needs to be replaced, but the low-pressure relief valve 3 can be reset and used multiple times, balancing economy and safety.

[0022] 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.

[0023] 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 explosion-proof cover with positive electrode conductivity and pressure relief function, comprising a battery assembly (1), characterized in that: The top surface of the battery assembly (1) is provided with an explosion-proof cover plate (2), the surface of the explosion-proof cover plate (2) is provided with a pressure relief valve (3), the surface of the explosion-proof cover plate (2) is provided with a first pressure relief groove (4), the surface of the explosion-proof cover plate (2) is provided with a second pressure relief hole (5), the surface of the explosion-proof cover plate (2) is provided with a terminal post (10), the bottom surface of the explosion-proof cover plate (2) is provided with a conductive post (7), the terminal post (10) is electrically connected to the conductive post (7), and the first pressure relief groove (4) and the second pressure relief hole (5) are located above the lithium battery body (101).

2. The explosion-proof cover for a lithium battery with positive electrode conductivity and pressure relief function as described in claim 1, characterized in that: The battery assembly (1) includes a lithium battery body (101) and a battery management system (BMS) (102), and the battery management system (BMS) (102) is provided on the side of the lithium battery body (101).

3. The explosion-proof cover for a lithium battery with positive electrode conductivity and pressure relief function according to claim 2, characterized in that: The surface of the lithium battery body (101) is provided with a positive electrode (6), and the shape and position of the conductive post (7) are adapted to the positive electrode (6).

4. A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function according to claim 3, characterized in that: The terminal (10) is located above the conductive post (7), and the terminal (10) is electrically connected to the lithium battery body (101) through the conductive post (7).

5. A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function according to claim 1, characterized in that: The explosion-proof cover (2) has mounting holes (8) on its surface, and mounting bolts (9) are provided on the surface of the mounting holes (8).

6. A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function according to claim 2, characterized in that: The lithium battery body (101) and the battery management system (BMS) (102) are electrically connected.

7. A lithium battery explosion-proof cover with positive electrode conductivity and pressure relief function according to claim 1, characterized in that: The four sides of the explosion-proof cover (2) are rounded, and the shape and position of the explosion-proof cover (2) correspond to the battery assembly (1).

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