Cap capable of secondary liquid injection and battery

Abstract

The utility model discloses a cap capable of secondary liquid injection and a battery. The cap comprises a cap bottom plate, a cap pressing plate, a top cover and a positive pole welding hole, the positive pole welding hole is formed in the center of the cap bottom plate, the cap pressing plate is supported on the cap bottom plate, a top cover mounting hole is formed in the top of the cap pressing plate, and a top cover is mounted in the top cover mounting hole; the projection surface of the top cover on the cap bottom plate covers the positive pole welding hole; a reinforcing rib is mounted on the upper surface of the cap pressing plate; and the projection plane of the reinforcing rib on the cap bottom plate surrounds the positive pole welding hole. According to the cap, secondary liquid injection can be realized, gas generated by formation can be discharged, the possibility of deformation of the cap due to pressure is reduced, the liquid leakage risk is reduced, and the internal pressure of a battery cell is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cap and battery that can be refilled with electrolyte. Background Technology

[0002] A battery cap is a component used to provide a sealed function for the battery and is an important part of ensuring battery safety. Power battery caps protect the safety of power batteries, providing overvoltage, explosion, and overcurrent protection. Through careful design, battery caps can also serve multiple functions, including providing battery sealing, temperature protection, and acting as a safety valve.

[0003] Traditional caps lack secondary injection holes, resulting in low efficiency in primary injection and poor electrolyte wetting. Furthermore, the absence of these holes prevents the release of gases generated during formation, reducing cell lifespan. Additionally, the lack of reinforcing ribs on the top cover of traditional caps increases the likelihood of deformation after sealing, raising the risk of leakage. Utility Model Content

[0004] The purpose of this invention is to provide a cap and battery that can be refilled with liquid to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A cap capable of secondary liquid injection includes a cap base plate, a cap pressure plate, a top cap, and a positive electrode welding hole;

[0007] The positive electrode welding hole is located in the center of the cap base plate, the cap pressure plate is supported on the cap base plate, the top of the cap pressure plate is provided with a top cover mounting hole, and a top cover is installed in the top cover mounting hole; the projection surface of the top cover on the cap base plate covers the positive electrode welding hole.

[0008] The upper surface of the cap plate is equipped with reinforcing ribs, and the projection surface of the reinforcing ribs on the cap base plate surrounds the positive electrode welding hole.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] The cap pressure plate includes a horizontal pressure plate and an inclined support plate; the horizontal pressure plate is attached to the upper surface of the cap base plate; one end of the inclined support plate is connected to the horizontal pressure plate, and the other end is provided with a support platform, the middle of which is a top cover mounting hole.

[0011] The reinforcing rib is installed on the upper surface of the horizontal pressure plate near the inclined support plate.

[0012] Furthermore, the outer end of the cap base plate away from the positive electrode welding hole is folded upward and pressed back against the cap pressure plate to form a folded back pressure end.

[0013] Furthermore, a sealing ring is provided on the outer periphery of the folded-back pressing end of the cap base plate. The sealing ring includes an outer ring with an L-shaped longitudinal section and a bottom ring. The outer ring is wrapped around the outer side of the folded-back pressing end of the cap base plate, and the bottom ring is attached to the bottom of the outer edge of the cap base plate.

[0014] Furthermore, the cap plate is provided with pressure relief holes.

[0015] The projection of the pressure relief hole on the cap base plate is located between the projection of the reinforcing rib on the cap base plate and the outer end of the cap base plate.

[0016] Furthermore, the cap base plate is provided with explosion-proof markings at the positions corresponding to the projection of the pressure relief hole on the cap base plate.

[0017] The bottom of the outer end of the cap base plate is provided with a groove, and the bottom surface of the sealing ring is provided with a convex ring that corresponds to and matches the groove, and the convex ring is embedded in the groove.

[0018] This utility model also protects a battery that includes the aforementioned cap.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention provides a cap that can be refilled with electrolyte. The cap has a secondary electrolyte injection hole formed by the positive electrode welding hole. It can be welded to the positive electrode to provide conductivity, and can also be used for secondary electrolyte injection. After formation, the gas generated during formation can be discharged, thereby improving the safety and lifespan of the battery cell.

[0021] The upper surface of the cap plate of this invention is equipped with reinforcing ribs. The projection surface of the reinforcing ribs on the cap base plate surrounds the positive electrode welding hole. The reinforcing ribs and the positive electrode welding hole cooperate with each other to ensure the normal internal pressure of the cell and jointly improve the safety of battery use.

[0022] The cap of this invention can keep the electrolyte inside the battery cell in an abundant state, increase the service life of the battery cell, and has reliable sealing and good overcurrent capacity. Attached Figure Description

[0023] Figure 1 : A cross-sectional view of the cap of this utility model that can be refilled with liquid.

[0024] Figure 2 : Schematic diagram of the cross-sectional structure of the cap plate.

[0025] Figure 3: Schematic diagram of the cross-sectional structure of the sealing ring.

[0026] In the diagram: 1-Top cover, 2-Cap pressure plate, 3-Reinforcing rib, 4-Cap bottom plate, 5-Pressure relief hole, 6-Sealing ring, 7-Explosion-proof markings, 8-Positive electrode welding hole, 9-Horizontal pressure plate, 10-Slanted support plate, 11-Outer ring, 12-Bottom ring, 13-Folded back pressure end, 14-Groove, 15-Convex ring, 16-Support platform. Detailed Implementation

[0027] The present invention will be further described in detail below through embodiments, but it should not be construed as the scope of the present invention being limited to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0028] In the description of this utility model, it should also be noted that:

[0029] The orientations or positional relationships described herein are based on the relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] This invention provides a cap that can be refilled, such as... Figure 1 As shown, it includes a cap base plate 4, a cap pressure plate 2, a top cover 1, and a positive electrode welding hole 8;

[0031] The positive electrode welding hole 8 is located in the center of the cap base plate 4. The cap pressure plate 2 is supported on the cap base plate 4. The top of the cap pressure plate 2 is provided with a top cover 1 mounting hole, and the top cover 1 is installed in the top cover 1 mounting hole. The projection surface of the top cover 1 on the cap base plate 4 covers the positive electrode welding hole 8. The upper surface of the cap pressure plate 2 is provided with a reinforcing rib 3. The projection surface of the reinforcing rib 3 on the cap base plate 4 surrounds the positive electrode welding hole 8.

[0032] The positive electrode welding hole 8 is used to weld to the positive electrode post, which serves as a conductive function. Secondly, it forms a secondary liquid injection hole in the positive electrode post, through which secondary liquid can be injected. After formation, the gas generated during formation can be discharged, improving the safety and lifespan of the battery cell.

[0033] The gases generated during the formation stage are mainly due to the accumulation of gases caused by the electrochemical reactions during the first charge of the battery. These gases can cause problems such as battery volume expansion and increased impedance, leading to battery performance degradation. If the internal pressure of the battery continues to rise, it will not only affect the stability and safety of the battery, but may also lead to battery explosion or combustion in extreme cases, releasing toxic and harmful gases.

[0034] The reinforcing rib 3 strengthens the sealing of the cap, resulting in a small deformation coefficient during sealing, reliable sealing, reduced possibility of cap deformation due to pressure, and lower risk of leakage.

[0035] The secondary electrolyte injection hole structure of the cap and the setting of the reinforcing rib 3 work together to ensure the normal internal pressure of the cell and jointly improve the safety of battery use. The cap of this utility model can keep the electrolyte inside the cell in a sufficient state, increasing the cell's service life. Among them, the projection surface of the reinforcing rib 3 on the cap base plate 4 surrounds the positive electrode welding hole 8, so that although the reinforcing rib 3 is only locally set, it can achieve the best pressure bearing effect, ensuring the safety performance of the battery while simplifying the structure.

[0036] In some implementations, such as Figure 2 As shown, the cap pressure plate 2 includes a horizontal pressure plate 9 and an inclined support plate 10; the horizontal pressure plate 9 is attached to the upper surface of the cap base plate 4; one end of the inclined support plate 10 is connected to the horizontal pressure plate 9, and the other end is provided with a support platform 16, the middle of which is the mounting hole for the top cover 1.

[0037] The reinforcing rib 3 is installed on the upper surface of the horizontal pressure plate 9 near the inclined support plate 10.

[0038] In some embodiments, the outer end of the cap base plate 4 away from the positive electrode welding hole 8 is folded upward and pressed back against the cap pressure plate 2 to form a folded back pressure end 13. The design of the folded back pressure end 13 makes the cap have better pressure bearing and sealing capabilities.

[0039] In some embodiments, a sealing ring 6 is provided on the outer periphery of the folded back pressure end 13 of the cap base plate 4, and the sealing ring 6 further ensures the airtightness after sealing.

[0040] Specifically, the sealing ring 6 includes an outer ring 11 with an L-shaped longitudinal section and a bottom ring 12, such as... Figure 3 As shown, the outer ring 11 wraps around the outer side of the folded back pressing end 13 of the cap base plate 4, and the bottom ring 12 is attached to the bottom of the outer edge of the cap base plate 4.

[0041] In some embodiments, the cap plate 2 is provided with a pressure relief hole 5.

[0042] The projection of the pressure relief hole 5 on the cap base plate 4 is located between the projection of the reinforcing rib 3 on the cap base plate 4 and the outer end of the cap base plate 4.

[0043] In some embodiments, an explosion-proof etched line 7 is provided on the cap base plate 4 at a position corresponding to the projection of the pressure relief hole 5 on the cap base plate 4. The pressure relief hole 5 and the explosion-proof etched line 7 cooperate to ensure the internal pressure of the battery cell and improve the safety performance of the battery cell. When the internal pressure of the battery rises abnormally, the pressure relief hole opens to release the internal pressure. When the internal pressure of the battery reaches a certain level, the etched area of ​​the explosion-proof etched line will rupture in a preset manner. The cooperation between the pressure relief hole and the explosion-proof etched line effectively prevents the risk of explosion and ensures its safety when the battery faces abnormal conditions (such as overcharging, short circuit, etc.) that cause a sharp rise in pressure.

[0044] The bottom of the outer end of the cap base plate 4 is provided with a groove 14, and the bottom ring 12 of the sealing ring 6 is provided with a convex ring 15 that corresponds to and matches the groove 14. The convex ring 15 is embedded in the groove 14.

[0045] This invention also provides a battery comprising the aforementioned cap. In specific applications, an aluminum cap base plate 4 is preferably used, and the aluminum cap base plate 4 and the cap pressure plate 2 are connected by laser wire welding to improve current carrying capacity. Tests have shown that batteries using the cap of this invention can achieve a maximum current carrying capacity of 10C.

[0046] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present utility model's technical solution and based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A refillable cap, characterized by: The cap bottom plate, the cap pressing plate, the top cover and the positive pole column welding hole are included. The positive pole column welding hole is arranged in the center of the cap bottom plate, the cap pressing plate is supported on the cap bottom plate, the top of the cap pressing plate is provided with a top cover mounting hole, and the top cover mounting hole is mounted with the top cover. The upper surface of the cap pressing plate is mounted with a reinforcing rib, and the projection of the reinforcing rib on the cap bottom plate surrounds the positive pole column welding hole.

2. The refillable cap of claim 1, wherein: The cap pressing plate includes a horizontal pressing plate and an inclined supporting plate, the horizontal pressing plate is attached to the upper surface of the cap bottom plate, one end of the inclined supporting plate is connected to the horizontal pressing plate, and the other end is provided with a supporting table, and the middle part of the supporting table is a top cover mounting hole.

3. The refillable cap of claim 2, wherein: The reinforcing rib is mounted on the upper surface of the end of the horizontal pressing plate close to the inclined supporting plate.

4. The refillable cap of claim 1, wherein: The outer end of the cap bottom plate away from the positive pole column welding hole is upwardly folded and back-pressed to the cap pressing plate, forming a folded back-pressing end.

5. The refillable cap of claim 4, wherein: The outer periphery of the folded back-pressing end of the cap bottom plate is provided with a sealing ring, the sealing ring includes an outer side ring and a bottom ring with an L-shaped longitudinal section, the outer side ring is wrapped around the outer side of the folded back-pressing end of the cap bottom plate, and the bottom ring is attached to the bottom of the outer end edge of the cap bottom plate.

6. The refillable cap of claim 1, wherein: The cap pressing plate is provided with a pressure relief hole.

7. The refillable cap of claim 6, wherein: The projection of the pressure relief hole on the cap bottom plate is located between the projection of the reinforcing rib on the cap bottom plate and the outer end of the cap bottom plate.

8. The refillable cap of claim 6, wherein: The cap bottom plate is provided with an anti-explosion marking line at a position corresponding to the projection of the pressure relief hole on the cap bottom plate.

9. The refillable cap of claim 5, wherein: The outer end of the cap bottom plate is provided with a groove, the bottom ring of the sealing ring is provided with a convex ring corresponding to the groove, and the convex ring is embedded in the groove.

10. A battery, characterized by: The cap includes the cap bottom plate, the cap pressing plate, the top cover and the positive pole column welding hole. The positive pole column welding hole is arranged in the center of the cap bottom plate, the cap pressing plate is supported on the cap bottom plate, the top of the cap pressing plate is provided with a top cover mounting hole, and the top cover mounting hole is mounted with the top cover. The upper surface of the cap pressing plate is mounted with a reinforcing rib, and the projection of the reinforcing rib on the cap bottom plate surrounds the positive pole column welding hole. The cap pressing plate includes a horizontal pressing plate and an inclined supporting plate, the horizontal pressing plate is attached to the upper surface of the cap bottom plate, one end of the inclined supporting plate is connected to the horizontal pressing plate, and the other end is provided with a supporting table, and the middle part of the supporting table is a top cover mounting hole. The reinforcing rib is mounted on the upper surface of the end of the horizontal pressing plate close to the inclined supporting plate. The outer end of the cap bottom plate away from the positive pole column welding hole is upwardly folded and back-pressed to the cap pressing plate, forming a folded back-pressing end. The outer periphery of the folded back-pressing end of the cap bottom plate is provided with a sealing ring, the sealing ring includes an outer side ring and a bottom ring with an L-shaped longitudinal section, the outer side ring is wrapped around the outer side of the folded back-pressing end of the cap bottom plate, and the bottom ring is attached to the bottom of the outer end edge of the cap bottom plate. The cap pressing plate is provided with a pressure relief hole. The projection of the pressure relief hole on the cap bottom plate is located between the projection of the reinforcing rib on the cap bottom plate and the outer end of the cap bottom plate. The cap bottom plate is provided with an anti-explosion marking line at a position corresponding to the projection of the pressure relief hole on the cap bottom plate. The outer end of the cap bottom plate is provided with a groove, the bottom ring of the sealing ring is provided with a convex ring corresponding to the groove, and the convex ring is embedded in the groove. The cap includes the cap bottom plate, the cap pressing plate, the top cover and the positive pole column welding hole.

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