Lithium battery cover plate structure

Abstract

The utility model relates to a kind of lithium battery cover plate structure, belong to lithium battery technical field.The lithium battery cover plate structure, comprising: cover plate body and the explosion-proof valve of being set in the middle place of cover plate body;Explosion-proof mechanism, the pressure block of being set in the explosion-proof valve inside is included in the explosion-proof mechanism, adjusting assembly is set between the pressure block and cover plate body, the upper surface of the cover plate body is set with adsorption box at explosion-proof valve;By setting the mounting block of carrying safety block into detachable, explosion-proof valve of cover plate can be conveniently replaced alone after being opened, without scrapping entire cover plate assembly.This way, when explosion-proof valve starts, only needs to replace mounting block, greatly reduces maintenance cost;By setting clamping block cooperation installation slot can quickly replace mounting block, improve the maintenance efficiency of cover plate.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a lithium battery cover structure. Background Technology

[0002] The lithium battery cover is a key component of hard-shell lithium batteries, used to seal the casing, conduct current, and ensure safety. Its main structure includes a metal cover body, positive and negative terminals, an explosion-proof valve, a filling hole, and insulating components. Among them, the explosion-proof valve is the core component that ensures battery safety. It is usually a serrated metal sheet. When the internal pressure of the battery exceeds a set value due to overcharging or overheating, the valve body ruptures to prevent the battery from exploding. However, in traditional explosion-proof valves, after the valve body ruptures, the serrated metal sheet deforms and breaks, making it unusable and costly.

[0003] As shown in the reference case "A Lithium Battery Cover Plate" (publication number CN221530096U), this utility model, by opening an injection port on the cover plate assembly and separating the injection port and the negative pressure extraction port by a first protrusion, allows for negative pressure extraction during cell injection, controlling the internal pressure of the battery to maintain a negative pressure, thereby improving battery injection efficiency, reducing injection time, and simplifying the injection process. Furthermore, integrating both the injection port and the negative pressure extraction port within the injection port reduces the area occupied by the negative pressure extraction port on the cover plate assembly.

[0004] Although the above application can improve the efficiency of battery liquid injection and simplify the liquid injection process by separating the liquid injection hole from the negative pressure hole, the metal plate of the explosion-proof valve in the application is located in the middle of the cover plate assembly. This means that once the explosion-proof valve is activated, the entire cover plate needs to be scrapped, resulting in high usage costs. Utility Model Content

[0005] Therefore, it is necessary to provide a lithium battery cover structure to address the issue of high operating costs of explosion-proof valves.

[0006] A lithium battery cover structure includes: a cover body and an explosion-proof valve disposed in the middle of the cover body;

[0007] An explosion-proof mechanism includes a pressure block disposed inside the explosion-proof valve, an adjustment component disposed between the pressure block and the cover plate body, and an adsorption box disposed on the upper surface of the cover plate body at the explosion-proof valve.

[0008] In one embodiment, the pressure block is a cone with its tip pointing downwards, and a rubber ring is provided on the surface of the pressure block. A rubber groove is provided on the inner wall of the cover plate body at a corresponding position.

[0009] The adjustment assembly includes two opposing positioning blocks fixedly connected to the surface of the cover plate body. In one embodiment, the positioning blocks have an "L"-shaped cross-section, and the top of the positioning blocks extends toward the center of the pressure block.

[0010] In one embodiment, a sliding rod is slidably connected to the inner wall of the positioning block, the bottom end of the sliding rod is fixedly connected to the pressure block, and a spring is sleeved around the sliding rod, the spring being fixedly connected between the top wall of the positioning block and the pressure block.

[0011] In one embodiment, the top end of the slide rod is provided with a mounting groove, and the top end of the slide rod is provided with a mounting block. A locking block is fixedly connected to the center of the lower surface of the mounting block, and the mounting block is installed on the top end of the slide rod by the locking block cooperating with the mounting groove.

[0012] In one embodiment, the lower surface of the mounting block has an annular groove, and two safety blocks are fixedly connected inside the annular groove. The upper surface of the positioning block has two trigger blocks fixedly connected, and the trigger blocks match the annular groove.

[0013] In one embodiment, the adsorption box is provided with a first adsorption chamber and a second adsorption chamber, the first adsorption chamber containing ceramic fibers and the second adsorption chamber containing activated carbon.

[0014] In one embodiment, the lower part of the first adsorption chamber is connected to an explosion-proof valve, the upper part of the first adsorption chamber is connected to a second adsorption chamber, and the second adsorption chamber is connected to the outside through a vent hole on the surface of the adsorption box. Beneficial effects

[0015] By making the mounting block carrying the safety block detachable, the explosion-proof valve on the cover can be easily replaced individually after opening, without scrapping the entire cover assembly. This means that when the explosion-proof valve is activated, only the mounting block needs to be replaced, significantly reducing maintenance costs. Furthermore, the use of a locking block in conjunction with the mounting groove allows for quick replacement of the mounting block, improving the maintenance efficiency of the cover.

[0016] By setting up an adsorption box, the gas released after the explosion-proof valve is opened can be effectively adsorbed and purified. The released gas will pass through activated carbon and ceramic fibers, which can quickly adsorb and neutralize harmful gases, reduce gas concentration, reduce the harm caused by the emission of toxic gases to the environment or operators, and improve the safety of the working environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation of the positioning component of this utility model;

[0020] Figure 3 This is a schematic diagram of the trigger state of the pressure block of this utility model;

[0021] Figure 4 This is a schematic diagram of the overall structure of the positioning component of this utility model;

[0022] Figure 5 This is a cross-sectional view of the adsorption box of this utility model;

[0023] Figure 6 This is a schematic diagram of the installation of the present invention and a lithium battery.

[0024] Figure label:

[0025] 100. Cover plate body; 200. Explosion-proof mechanism; 210. Pressure block; 220. Adjustment component; 221. Positioning block; 222. Slide rod; 2221. Mounting groove; 2222. Trigger block; 2223. Spring; 223. Mounting block; 2231. Locking block; 2232. Annular groove; 2233. Safety block; 230. Adsorption box; 231. First adsorption chamber; 232. Second adsorption chamber. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] The following is combined with Figures 1-6 This invention describes the structure of a lithium battery cover plate.

[0028] In one embodiment, a lithium battery cover structure includes: a cover body 100 and an explosion-proof valve disposed in the middle of the cover body 100.

[0029] The explosion-proof mechanism 200 includes a pressure block 210 disposed inside the explosion-proof valve, an adjustment component 220 disposed between the pressure block 210 and the cover plate body 100, and an adsorption box 230 disposed on the upper surface of the cover plate body 100 at the explosion-proof valve.

[0030] The lithium battery cover plate in this device is model 32160 lithium battery cover plate. The cover plate structure is mainly composed of the following components:

[0031] The main body of the aluminum alloy cover plate is made of aluminum alloy and is installed on the top of the battery casing. The bare battery cells are fixed by laser welding and sealed to prevent internal material leakage and external environmental influence.

[0032] The copper-aluminum composite electrode is made of copper and aluminum. It is installed at both ends of the cover plate surface and connects the battery cell tabs to the external circuit to enable the conduction of charging and discharging current.

[0033] The explosion-proof valve is mainly composed of pressure block 210, which is installed in the middle of the cover plate. It opens to release pressure when the internal air pressure of the battery rises abnormally, thereby reducing the risk of explosion.

[0034] The electrolyte injection port is made of metal sealing material and is installed next to the explosion-proof valve. It is used to seal after electrolyte is injected to maintain the internal environment of the battery.

[0035] The insulating component, made of conductive PPS plastic, is installed between the positive terminal and the cover plate to reduce the potential difference, prevent electro-corrosion, and improve battery life.

[0036] like Figure 3 , Figure 4 and Figure 5As shown, the pressure block 210 is conical with its tip pointing downwards. A rubber ring is provided on the surface of the pressure block 210, and a rubber groove is formed on the inner wall of the cover plate body 100 at a corresponding position. The adjustment assembly 220 includes two opposing positioning blocks 221 fixedly connected to the surface of the cover plate body 100. The cross-section of the positioning blocks 221 is L-shaped, and the top of the positioning blocks 221 extends towards the center of the pressure block 210. A slide rod 222 is slidably connected to the inner wall of the positioning blocks 221. The bottom end of the slide rod 222 is connected to the pressure block 210, and a spring 2223 is sleeved around the slide rod 222. The spring 2223 is fixedly connected between the top wall of the positioning block 221 and the pressure block 210. The top of the slide rod 222 has a mounting groove 2221, and a mounting block 223 is provided at the top of the slide rod 222. A locking block 2231 is fixedly connected to the center of the lower surface of the mounting block 223. The mounting block 223 is installed at the top of the slide rod 222 through the locking block 2231 cooperating with the mounting groove 2221. The lower surface of the mounting block 223 has an annular groove 2232, and two safety blocks 2233 are fixedly connected inside the annular groove 2232. Two trigger blocks 2222 are fixedly connected to the upper surface of the positioning block 221, and the trigger blocks 2222 match the annular groove 2232.

[0037] In this embodiment, the locking block 2231 consists of a horizontal plate and a support column, while the mounting groove 2221 consists of a straight opening at the top of the slide rod 222 and a 90-degree fan-shaped section inside the slide rod 222 to provide space for the horizontal rod to rotate. When the locking block 2231 is inserted into the slot, the horizontal plate needs to be aligned with the straight opening at the top of the slide rod 222, and the support column needs to be inserted into the circular groove on the inner wall of the slide rod 222. Then, the mounting block 223 is rotated, which drives the support column and the horizontal plate to rotate, causing the horizontal plate to rotate 90 degrees. At this time, the upper part of the horizontal plate is in a closed state, thus forming a locking connection to complete the installation. The safety block 2233 is fixed to the inner wall of the mounting block 223 and the lower surface of the mounting block 223. The surfaces are flush, and the shapes of the two trigger blocks 2222 match the shape formed by the annular groove 2232 and the safety block 2233. When the mounting block 223 is installed into the slide bar 222, the trigger blocks 2222 will be inserted into the annular groove 2232 simultaneously, and the safety block 2233 will pass through the gap between the two trigger blocks 2222. Then, the mounting block 223 is rotated, and the mounting block 223 will drive the safety block 2233 to rotate simultaneously, so that the safety block 2233 moves to the bottom of the trigger block 2222. As the gas pressure inside the lithium battery increases, the upward force of the mounting block 223 increases. When the gas pressure reaches a certain value, the trigger block 2222 will pull the safety block 2233 out of the annular groove 2232, thereby completing the pressure relief.

[0038] It should be noted that the explosion-proof mechanism 200 of this device optimizes the traditional metal sheet into an adjustment component 220 combined with a metal block. The explosion-proof mechanism 200 of this device is located above the cover plate and its height does not exceed the pole column. Therefore, this device will not affect the installation of other components of the cover plate or the installation of the cover plate itself. At the same time, after adding the adjustment component 220, the corresponding data needs to be adjusted according to different cover plate installation requirements to avoid affecting the normal use of the explosion-proof valve.

[0039] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the adsorption box 230 is provided with a first adsorption chamber 231 and a second adsorption chamber 232. The first adsorption chamber 231 contains ceramic fibers, and the second adsorption chamber 232 contains activated carbon. The lower part of the first adsorption chamber 231 is connected to an explosion-proof valve, and the upper part of the first adsorption chamber 231 is connected to the second adsorption chamber 232. The second adsorption chamber 232 is connected to the outside through ventilation holes on the surface of the adsorption box 230.

[0040] In this embodiment, after the explosion-proof valve is opened, the pressure block 210 is pushed upward by the air pressure, pushing the cover plate outward. At this time, the gas will flow outward along the lower surface of the pressure block 210. Since the lower part of the pressure block 210 is conical, the gas will flow into the adsorption box 230 along its surface. After entering the adsorption box 230, the gas will flow upward and first pass through the ceramic fiber. The ceramic fiber will adsorb the corrosive gas in the gas and react. The gas passing through the ceramic fiber will then enter the second adsorption chamber 232 and come into contact with the activated carbon. At this time, the activated carbon can adsorb the organic matter in the gas. The device removes harmful components from the gas, including compounds, volatile harmful substances, and odor molecules. The purified gas is then discharged through the vents on the side of the second adsorption chamber 232. The cover plate body 100 has mounting clips on both sides, and the inner walls of the corresponding lithium battery casing have matching mounting slots. When installing the device with the lithium battery casing, the device is placed over the lithium battery casing, the corresponding components are welded to the lithium battery, and the mounting clips are inserted into the corresponding slots. Then, sealant is applied to the gap between the cover plate body 100 and the lithium battery casing, and the gap is welded to complete the installation.

[0041] Working principle: When the internal pressure of the battery increases due to overcharging or overheating, the increased pressure will apply pressure to the pressure block 210, pushing the pressure block 210 upward. At the same time, the pressure block 210 pushes the slide rod 222 upward. When the pressure reaches a certain value, the safety block 2233 will be pulled off from the annular groove 2232 by the trigger block 2222. Under the action of gas pressure, the pressure block 210 will quickly move upward, driving the slide rod 222 to move and compress the spring 2223. The elastic force of the spring 2223 will reduce the impact force when the pressure block 210 pops out of the cover plate.

[0042] When the explosion-proof valve is opened, it can be reused by replacing the mounting block 223 and installing it at the top of the slide rod 222. Specifically, the pressure block 210 and the slide rod 222 are reset, and the locking block 2231 of the replaced mounting block 223 is aligned with the mounting groove 2221 at the top of the slide rod 222 and inserted. When rotated 90 degrees, the locking block 2231 is engaged at the top of the slide rod 222. At the same time, when the locking block 2231 is inserted into the groove, the trigger block 2222 is simultaneously inserted into the annular groove 2232. When the mounting block 223 is rotated, the trigger block 2222 rotates synchronously in the annular groove 2232 until the annular groove 2232 moves above the sensing block, and the cover can be reused.

[0043] It should be noted that the spring 2223 and the cover plate body 100 mentioned above are both devices with relatively mature existing technology. The specific models can be selected according to actual needs, and will not be elaborated here.

[0044] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery cover structure, characterized in that, include: The cover plate body (100) and the explosion-proof valve disposed in the middle of the cover plate body (100); An explosion-proof mechanism (200) includes a pressure block (210) disposed inside the explosion-proof valve. An adjustment component (220) is disposed between the pressure block (210) and the cover plate body (100). An adsorption box (230) is disposed on the upper surface of the cover plate body (100) at the explosion-proof valve.

2. The lithium battery cover structure according to claim 1, characterized in that, The pressure block (210) is a cone with its tip pointing downwards. A rubber ring is provided on the surface of the pressure block (210), and a rubber groove is provided on the inner wall of the cover plate body (100) at the corresponding position.

3. The lithium battery cover structure according to claim 1, characterized in that, The adjustment assembly (220) includes two opposing positioning blocks (221) fixedly connected to the surface of the cover body (100). The positioning blocks (221) have an "L" shaped cross-section and the top of the positioning blocks (221) extends toward the center of the pressure block (210).

4. The lithium battery cover structure according to claim 3, characterized in that, The inner wall of the positioning block (221) is slidably connected to a slide rod (222). The bottom end of the slide rod (222) is fixedly connected to the pressure block (210). A spring (2223) is sleeved around the slide rod (222). The spring (2223) is fixedly connected between the top wall of the positioning block (221) and the pressure block (210).

5. The lithium battery cover structure according to claim 4, characterized in that, The top end of the slide rod (222) is provided with a mounting groove (2221), and the top end of the slide rod (222) is provided with a mounting block (223). A locking block (2231) is fixedly connected to the center of the lower surface of the mounting block (223). The mounting block (223) is installed on the top end of the slide rod (222) through the locking block (2231) and the mounting groove (2221).

6. The lithium battery cover structure according to claim 5, characterized in that, The mounting block (223) has an annular groove (2232) on its lower surface. Two safety blocks (2233) are fixedly connected inside the annular groove (2232). Two trigger blocks (2222) are fixedly connected to the upper surface of the positioning block (221). The trigger blocks (2222) match the annular groove (2232).

7. The lithium battery cover structure according to claim 1, characterized in that, The adsorption box (230) is provided with a first adsorption chamber (231) and a second adsorption chamber (232). The first adsorption chamber (231) contains ceramic fibers, and the second adsorption chamber (232) contains activated carbon.

8. The lithium battery cover structure according to claim 7, characterized in that, The first adsorption chamber (231) is connected to the explosion-proof valve at the bottom and to the second adsorption chamber (232) at the top. The second adsorption chamber (232) is connected to the outside through the ventilation holes on the surface of the adsorption box (230).

Images