Explosion-proof steel shell battery structure

Abstract

The utility model discloses an explosion-proof steel shell battery structure which comprises a shell assembly and an insulation assembly, the shell assembly comprises a cover plate, an explosion-proof foil and a steel shell, the cover plate is installed on the steel shell, an explosion-proof hole is formed in the cover plate, the explosion-proof hole is communicated with an inner cavity of the steel shell, the explosion-proof foil is welded to the cover plate through laser, and the explosion-proof foil covers the explosion-proof hole; the insulation assembly comprises a center fixing piece and an insulation part, the center fixing piece is arranged on the insulation part, and the cover plate is installed on the insulation part. In the production process of the laser sealing process, the explosion-proof foil sheet can be arranged on the cover plate and covers the explosion-proof hole, so that the safety of the steel shell battery welded by laser can be effectively improved, and when the internal pressure is too large, the internal pressure can be released in time through the explosion-proof hole to achieve the explosion-proof purpose; and the explosion risk of the steel shell battery is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel-cased battery structures, and in particular to an explosion-proof steel-cased battery structure. Background Technology

[0002] In the field of steel-cased batteries, such as the 11390 series, 78240 series, 58530 series, 1260X series, and 9295X series small batteries, the manufacturing process typically includes a three-piece set: an upper shell, a lower shell, and a rubber ring. If excessive internal pressure occurs, the rubber ring, due to its flexibility, causes the upper and lower shells to stretch outwards, thus alleviating the problem of excessive internal pressure, or the battery may burst open directly at the rubber ring location. However, laser-welded sealed battery structures do not employ this three-piece structure. Therefore, the pressure resistance and explosion-proof performance of these batteries is weaker than that of traditional steel-cased batteries, resulting in a lower safety factor and poorer stability. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an explosion-proof steel-cased battery structure.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] An explosion-proof steel-cased battery structure includes:

[0006] The housing assembly includes a cover plate, an explosion-proof foil sheet, and a steel shell. The cover plate is installed on the steel shell and has an explosion-proof hole that communicates with the internal cavity of the steel shell. The explosion-proof foil sheet is laser-welded to the cover plate and covers the explosion-proof hole.

[0007] An insulating assembly, comprising a central fixing member and an insulating component, wherein the central fixing member is disposed on the insulating component and the cover plate is mounted on the insulating component.

[0008] In one embodiment, the thickness of the explosion-proof foil is 0.08 mm to 0.18 mm.

[0009] In one embodiment, the number of explosion-proof foil sheets is at least one.

[0010] In one embodiment, a battery cell is also included, which is housed within the internal cavity of the steel casing.

[0011] In one embodiment, the insulating assembly further includes an insulating pad disposed on the central fixing member.

[0012] In one embodiment, the insulating component has a through hole, the insulating gasket has a mounting hole, the central fixing member passes through the through hole and the mounting hole in sequence, the central fixing member has a fixing groove, and the insulating gasket is fitted into the fixing groove.

[0013] In one embodiment, the insulating component includes an insulating column and an insulating ring, the insulating ring being disposed on the insulating column, and the insulating ring and the insulating column together forming a mounting groove, the cover plate having a central hole, and the cover plate being fitted onto the mounting groove.

[0014] In one embodiment, the explosion-proof foil is welded to the outer surface of the cover plate.

[0015] In one embodiment, the explosion-proof foil is welded to the cover plate, and the explosion-proof foil is located on the inner surface of the cover plate.

[0016] In one embodiment, two explosion-proof foil sheets are provided, and the two explosion-proof foil sheets are respectively welded to the inner and outer surfaces of the explosion-proof holes of the cover plate.

[0017] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0018] This utility model relates to an explosion-proof steel-shell battery structure. During the production process of laser sealing, explosion-proof foil can be set on the cover plate and covered over the explosion-proof hole, thereby effectively improving the safety of the laser-welded steel-shell battery. When the internal pressure is too high, the internal pressure can be released in time through the explosion-proof hole to achieve the purpose of explosion prevention, thereby reducing the risk of steel-shell battery explosion. Attached Figure Description

[0019] Figure 1 This is a structural diagram of an explosion-proof steel-cased battery structure according to one embodiment of the present invention;

[0020] Figure 2 for Figure 1 The diagram shown is a structural diagram of an explosion-proof steel-cased battery.

[0021] Figure 3 for Figure 1 The diagram shown is a structural diagram of an explosion-proof steel-cased battery.

[0022] Figure 4 for Figure 1 The diagram shows the structure of an explosion-proof steel-cased battery. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0024] Small battery structures generally consist of three parts: an upper shell, a lower shell, and a rubber ring. If the internal pressure is too high, the rubber ring, due to its flexibility, will cause the upper and lower shells to stretch outwards, thereby alleviating the problem of excessive internal pressure, or the battery may burst open directly from the rubber ring.

[0025] However, laser-sealed steel-cased battery structures lack the three-piece steel casing, making pressure relief difficult to control. Assuming no explosion-proof diaphragm is installed, the weakest point in the battery's pressure resistance is the insulating pillar in the center of the cover plate; the rest of the casing lacks pressure relief points, resulting in a lower safety factor compared to the three-piece steel casing structure. Therefore, installing an explosion-proof diaphragm can address these drawbacks. Furthermore, by adjusting the explosion-proof pressure according to the diaphragm's thickness, and by incorporating explosion-proof diaphragms and pressure relief holes, the safety of laser-sealed batteries can be significantly improved.

[0026] The 11390, 78240, 58530, 1260X, and 9295X e-cigarette batteries are primarily batteries that utilize laser sealing technology. Laser sealing offers relatively poor explosion-proof safety; therefore, matching an explosion-proof sheet can improve the safety factor. Adjusting the thickness and setting the required explosion-proof pressure value for the battery can also be beneficial.

[0027] Further, please refer to Figures 1-4 An explosion-proof steel-cased battery structure includes: a casing assembly 10 and an insulating assembly 20. It should be noted that the casing assembly is used to protect the battery; the insulating assembly 20 is used to provide insulation.

[0028] The housing assembly 10 includes a cover plate 11, an explosion-proof foil 12, and a steel shell 13. The cover plate is mounted on the steel shell and has an explosion-proof hole 14 that communicates with the internal cavity of the steel shell. The explosion-proof foil is laser-welded to the cover plate and covers the explosion-proof hole. It should be noted that the steel shell has high strength and good sealing performance, providing a space for the electrodes, electrolyte, and other components inside the battery. This effectively prevents the intrusion of external substances and can withstand a certain amount of internal pressure, ensuring the structural integrity of the battery during normal use. The cover plate, mounted on the steel shell, ensures the airtightness of the battery's interior. The explosion-proof hole on the cover plate, communicating with the internal cavity of the steel shell, is an important channel for releasing internal battery pressure. When the internal pressure of the battery rises sharply due to abnormal conditions, gas can be discharged through the explosion-proof hole, preventing excessive pressure buildup inside the battery. The explosion-proof foil is firmly fixed to the cover plate by laser welding and covers the explosion-proof hole. Laser welding offers advantages such as high welding strength and excellent sealing, ensuring a secure and reliable connection between the explosion-proof foil and the cover plate. Under normal circumstances, the explosion-proof foil seals the explosion-proof vent, preventing electrolyte leakage and the entry of external air into the battery. When the internal pressure of the battery exceeds a set safety threshold, the explosion-proof foil ruptures under pressure, allowing gas to escape rapidly through the explosion-proof vent, thereby reducing the internal pressure of the battery and preventing serious accidents such as battery explosions.

[0029] The insulating assembly 20 includes a central fixing member 21 and an insulating component 22. The central fixing member is disposed on the insulating component, and the cover plate is mounted on the insulating component. It should be noted that the cover plate is mounted on the insulating component, which effectively isolates the cover plate from the electrical connection between it and other components inside the battery, preventing current leakage to the outside of the battery through the cover plate. The central fixing member also works in conjunction with the insulating component to further enhance the insulation effect and ensure battery safety.

[0030] Thus, during the production process of laser sealing, explosion-proof foil can be set on the cover plate and covered over the explosion-proof hole, which can effectively improve the safety of the laser-welded steel-cased battery. When the internal pressure is too high, the internal pressure can be released in time through the explosion-proof hole to achieve the purpose of explosion prevention and reduce the risk of steel-cased battery explosion.

[0031] In this embodiment, the thickness of the explosion-proof foil is 0.08mm to 0.18mm. Its explosion-proof pressure is 2MPa to 12MPa. Preferably, the thickness of the explosion-proof foil is 0.10mm, 0.12mm, or 0.15mm.

[0032] It should also be noted that at least one explosion-proof foil is required. Of course, the number of explosion-proof foils can be adjusted according to the actual explosion-proof pressure; multiple explosion-proof foils can increase the explosion-proof pressure and further improve stability.

[0033] It should be noted that the explosion-proof steel-cased battery structure also includes a battery cell 30, which is housed within the internal cavity of the steel casing. The battery cell is used to provide electrical energy.

[0034] The insulating component 20 further includes an insulating gasket 23, which is disposed on the central fixing member. The insulating component has a through hole, and the insulating gasket has a mounting hole. The central fixing member passes through the through hole and the mounting hole sequentially, and has a fixing groove. The insulating gasket is fitted into the fixing groove. In this embodiment, the central fixing member is a rivet. Specifically, the insulating gasket effectively isolates the high-voltage current that may be generated inside the battery from the external environment, thereby preventing the risk of current leakage or short circuit. The central fixing member, through its passage through the through hole and the mounting hole, not only achieves a firm connection between the insulating component and the insulating gasket, but also ensures the stability and reliability of the entire insulating component structure. Furthermore, the fixing groove on the rivet tightly houses the insulating gasket; this "nested" structure greatly enhances the stability of the connection and the insulation effect. Meanwhile, the insulating gasket 23, together with the central fixing member 21 and the cover plate 11, forms a seal, isolating the battery cavity from the external environment, preventing electrolyte leakage and preventing external environmental substances (such as moisture and air) from entering the battery, thus ensuring good battery performance. The insulating gasket 23 electrically insulates the cover plate 11 from the central fixing member 21, preventing short circuits in the battery.

[0035] The insulating component 22 includes an insulating column 221 and an insulating ring 222. The insulating ring is disposed on the insulating column, and the insulating ring and the insulating column together form a mounting groove. A central hole is provided on the cover plate, and the cover plate is fitted onto the mounting groove. The insulating column 221 and the insulating ring 222 are integrally formed. Specifically, the insulating component 22 adopts a combined structure of the insulating column 221 and the insulating ring 222. The insulating column, as a supporting structure, provides the necessary mechanical strength and stability, while the insulating ring is arranged around the column, and the two together form a unique mounting groove. This not only facilitates precise alignment and fitting with the central hole on the cover plate, but also ensures a tight fit between the cover plate and the insulating component through the optimization of its shape and size, thereby effectively preventing interference from the external environment to the internal circuitry of the battery.

[0036] In one embodiment, the explosion-proof foil is welded to the outer surface of the cover plate. In this embodiment, the explosion-proof foil is laser-welded to the cover plate, which effectively improves welding convenience and reliability. The explosion-proof hole can also serve as a liquid injection hole for convenient liquid injection operations.

[0037] In another embodiment, the explosion-proof foil is welded to the cover plate, and the explosion-proof foil is located on the inner surface of the cover plate. In this embodiment, welding the explosion-proof foil inside the housing can effectively achieve the explosion-proof function. In this case, battery electrolyte filling can be performed first, and then the entire cover can be welded.

[0038] In the third embodiment, two explosion-proof foil sheets are provided, and the two sheets are respectively welded to the inner and outer surfaces of the explosion-proof holes in the cover plate. In this embodiment, the explosion-proof pressure is greater with both inner and outer foil sheets, resulting in a higher safety factor. In this case, the battery electrolyte filling process can be performed first, and then the entire cover can be welded.

[0039] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A structure for an explosion-proof steel-cased battery, characterized in that, include: The housing assembly includes a cover plate, an explosion-proof foil sheet, and a steel shell. The cover plate is installed on the steel shell and has an explosion-proof hole that communicates with the internal cavity of the steel shell. The explosion-proof foil sheet is laser-welded to the cover plate and covers the explosion-proof hole. An insulating assembly, comprising a central fixing member and an insulating component, wherein the central fixing member is disposed on the insulating component and the cover plate is mounted on the insulating component.

2. The explosion-proof steel-cased battery structure according to claim 1, characterized in that, The thickness of the explosion-proof foil is 0.08mm to 0.18mm.

3. The explosion-proof steel-cased battery structure according to claim 1, characterized in that, The number of explosion-proof foil sheets shall be at least one.

4. The explosion-proof steel-cased battery structure according to claim 1, characterized in that, It also includes battery cells, which are housed within the internal cavity of the steel casing.

5. The explosion-proof steel-cased battery structure according to claim 1, characterized in that, The insulating assembly also includes an insulating gasket, which is disposed on the central fixing member.

6. The explosion-proof steel-cased battery structure according to claim 5, characterized in that, The insulating component has a through hole, the insulating gasket has a mounting hole, the central fixing member passes through the through hole and the mounting hole in sequence, the central fixing member has a fixing groove, and the insulating gasket is fitted into the fixing groove.

7. The explosion-proof steel-cased battery structure according to claim 6, characterized in that, The insulating component includes an insulating column and an insulating ring. The insulating ring is disposed on the insulating column, and the insulating ring and the insulating column together form a mounting groove. A central hole is provided on the cover plate, and the cover plate is fitted onto the mounting groove.

8. The explosion-proof steel-cased battery structure according to any one of claims 1 to 7, characterized in that, The explosion-proof foil is welded to the outer surface of the cover plate.

9. The explosion-proof steel-cased battery structure according to any one of claims 1 to 7, characterized in that, The explosion-proof foil is welded to the cover plate, and the explosion-proof foil is located on the inner surface of the cover plate.

10. The explosion-proof steel-cased battery structure according to any one of claims 1 to 7, characterized in that, Two explosion-proof foil sheets are provided, and the two explosion-proof foil sheets are respectively welded to the inner and outer surfaces of the explosion-proof holes of the cover plate.

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