Battery cap with anti-corrosion structure and sodium ion cylindrical battery

Abstract

The utility model provides a battery cap with an anti-corrosion structure and a sodium ion cylindrical battery. The battery cap with the anti-corrosion structure comprises a top cover, a metal sheet, an insulating ring, a bottom cover, a sealing ring and a protective layer, the metal sheet wraps the periphery of the top cover in a surrounding mode and is partially located on the outer side of the top cover, and the sealing ring wraps the periphery of the metal sheet and the periphery of the bottom cover in a surrounding mode. The sealing ring is further connected with the bottom cover in a sealing mode so that a metal exposure area can be formed on the metal sheet, and the protection layer is located on the outer side of the top cover and connected to the metal sheet. The protective layer is additionally arranged to cover the metal sheet exposed on the outer side of the battery cap, so that the metal sheet can be isolated from an external medium, and compared with a traditional battery cap, corrosion of metal caused by chemical reaction due to direct contact between the metal on the outer side of the battery cap and the external medium can be effectively prevented, and the service life of the battery cap is prolonged. The safety performance and the service life of the battery are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery caps, and in particular to a battery cap with an anti-corrosion structure and a sodium ion cylindrical battery. Background Art

[0002] When a sodium ion cylindrical battery is placed in seawater, corrosion and bubbling will occur at the cap. This is because the aluminum at the edge of the cap reacts with seawater and corrodes. Chloride ions are adsorbed on the surface of the oxide film to replace oxygen elements and generate AlCl3, which is easily soluble in water, thus forming pores. Since there are trace amounts of impurities such as iron, silicon, and copper in aluminum, when aluminum comes into contact with an electrolyte solution (such as a NaCl solution), it will be corroded by the action of the primary battery.

[0003] In the prior art, the exposed metal (such as aluminum) on the outside of the battery cap is usually not protected. For example, the Chinese patent with application number CN202222874462.9 discloses a battery cap, which includes a top cap, an explosion-proof plate, a perforated plate and a plugging member. Among them, the top cap is formed with a plurality of exhaust holes, and the plurality of exhaust holes are arranged at intervals. The sheet body surrounds and covers the periphery of the top cap to form an exhaust cavity, and the exhaust cavity is connected to each exhaust hole. The sheet body is formed with a first connecting hole, and the exhaust cavity is connected to the first connecting hole. The perforated plate is located on the side of the sheet body away from the top cap, the perforated plate is connected to the protruding portion, the perforated plate is formed with a second connecting hole, and the first connecting hole is connected to the second connecting hole. The plugging member includes a plug body and a waterproof breathable membrane, the plug body is formed with a breathable channel, the waterproof breathable membrane is located in the breathable channel and connected to the plug body, the exhaust cavity is connected to the breathable channel, the plug body is sequentially penetrated in the first connecting hole and the second connecting hole, and the plug body is respectively connected to the sheet body and the perforated plate.

[0004] The battery cap has good exhaust performance and makes the battery safer to use. It improves the exhaust performance of the battery and the safety of the battery by adding an exhaust structure. However, it does not solve the problem of how to protect the exposed metal on the outside of the battery cap. When the external metal is corroded (such as: chemically reacting with seawater when placed in seawater), the current will be out of control, the battery temperature will rise, the battery will be rapidly consumed, and it may even cause leakage. Battery leakage can also cause excessive current, heating, fire and explosion, reducing the safety performance of the battery.

[0005] Therefore, a corrosion-resistant battery cap structure is needed to improve the safety performance of the battery. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a battery cap and a sodium ion cylindrical battery with an anti-corrosion structure.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A battery cap with an anti-corrosion structure includes a top cover, a metal sheet, an insulating ring, a bottom cover and a sealing ring. The metal sheet is electrically connected to the top cover and the bottom cover respectively. The metal sheet surrounds and wraps the periphery of the top cover and is partially located outside the top cover. The insulating ring is clamped and connected between the metal sheet and the bottom cover. The sealing ring surrounds and wraps the periphery of the metal sheet and the periphery of the bottom cover. The sealing ring is also hermetically connected to the bottom cover to form a metal exposed area on the metal sheet. The battery cap with the anti-corrosion structure further includes a protective layer. The protective layer is located outside the top cover and connected to the metal sheet, and at least part of the protective layer is located within the metal exposed area.

[0009] In one embodiment, the projected area of the protective layer on the metal sheet is greater than or equal to the area of the metal exposed area.

[0010] In one embodiment, the protective layer is bonded to the metal sheet.

[0011] In one embodiment, the protective layer is a waterproof coating layer.

[0012] In one embodiment, the thickness of the waterproof coating layer is 1 mm - 5 mm.

[0013] In one embodiment, the protective layer is electroplated on the metal sheet.

[0014] In one embodiment, the protective layer is a silver protective layer.

[0015] In one embodiment, the thickness of the silver protective layer is 1 mm - 5 mm.

[0016] In one embodiment, the insulating ring and the sealing ring are rubber rings.

[0017] A sodium-ion cylindrical battery includes the battery cap with the anti-corrosion structure according to any one of the above embodiments.

[0018] Compared with the prior art, the present disclosure has at least the following advantages:

[0019] For the above-mentioned battery cap with the anti-corrosion structure, by adding a protective layer to cover the metal sheet exposed outside the battery cap, that is, the protective layer shields the metal exposed area, so that the exposed part of the metal sheet can be isolated from the external medium. Compared with the traditional battery cap, it can effectively prevent the direct contact between the metal outside the battery cap and the external medium, thereby reducing the probability of chemical reaction of the exposed part of the metal sheet and causing metal corrosion, and improving the safety performance and service life of the battery. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related accompanying drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic cross-sectional structure diagram of a battery cap with an anti-corrosion structure in an embodiment;

[0022] Figure 2 is Figure 1 Partial enlarged schematic diagram at A of the shown cross-sectional structure diagram;

[0023] Figure 3 Schematic top view structure diagram of a sodium-ion cylindrical battery with a normal cap in an embodiment. Detailed implementation manners

[0024] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant accompanying drawings. The preferred embodiments of the present disclosure are shown in the accompanying drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure content of the present disclosure understood more thoroughly and comprehensively.

[0025] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] The present disclosure provides a battery cap with an anti-corrosion structure, which includes a top cover, a metal sheet, an insulating ring, a bottom cover and a sealing ring. The metal sheet is electrically connected to the top cover and the bottom cover respectively. The metal sheet surrounds and wraps the periphery of the top cover and partially extends outside the top cover. The insulating ring is clamped and connected between the metal sheet and the bottom cover. The sealing ring surrounds and wraps the periphery of the metal sheet and the periphery of the bottom cover, and the sealing ring is also hermetically connected to the bottom cover to form a metal exposure area on the metal sheet. The battery cap with the anti-corrosion structure further includes a protective layer, which is located outside the top cover and connected to the metal sheet, and at least part of the protective layer is located within the metal exposure area.

[0028] For the above-mentioned battery cap with an anti-corrosion structure, by adding a protective layer to cover the metal sheet exposed outside the battery cap, that is, the protective layer shields the metal exposure area, so that the exposed part of the metal sheet can be isolated from the external medium. Compared with the traditional battery cap, it can effectively prevent the direct contact between the metal outside the battery cap and the external medium, thereby reducing the probability of chemical reaction of the exposed part of the metal sheet and causing metal corrosion, and improving the safety performance and service life of the battery.

[0029] To better understand the technical solutions and beneficial effects of the present disclosure, the following further elaborates on the present disclosure with specific embodiments:

[0030] As Figures 1 to 3 shown, a battery cap 10 with an anti-corrosion structure in an embodiment includes a top cover 100, a metal sheet 200, an insulating ring 300, a bottom cover 400 and a sealing ring 500. The metal sheet 200 is electrically connected to the top cover 100 and the bottom cover 400 respectively. The metal sheet 200 surrounds and wraps the periphery of the top cover 100 and partially extends outside the top cover 100. The insulating ring 300 is clamped and connected between the metal sheet 200 and the bottom cover 400. The sealing ring 500 surrounds and wraps the periphery of the metal sheet 200 and the periphery of the bottom cover 400, and the sealing ring 500 is also hermetically connected to the bottom cover 400 to form a metal exposure area 201 on the metal sheet 200. The battery cap 10 with the anti-corrosion structure further includes a protective layer 600, which is located outside the top cover 100 and connected to the metal sheet 200, and at least part of the protective layer 600 is located within the metal exposure area 201.

[0031] In this embodiment, three groups of experiments were designed to test the protection effects of the protective layer 600 and the cap without the protective layer 600 respectively: three groups of sodium-ion cylindrical battery cells of the same batch, with the same capacity, voltage, and positive and negative electrodes. One group of battery cells used a normal cap, one group had a layer of waterproof coating added to the aluminum metal on the edge of the cap, and the material of the waterproof coating layer was water-based asphalt-based waterproof coating. One group had a layer of silver plated on the aluminum metal on the edge of the cap. The three groups of batteries were placed in seawater. The results were as follows:

[0032] In the first group of experiments, corrosion and bubbling occurred at the cap of the sodium-ion battery with a normal cap.

[0033] In the second group of experiments, no corrosion or bubbling occurred at the cap of the sodium-ion battery with the waterproof coating added.

[0034] In the third group of experiments, no corrosion or bubbling occurred at the cap of the sodium-ion battery with silver plating.

[0035] It can be seen that adding a layer of waterproof coating or plating a layer of silver on the metal sheet 200 outside the cap can protect the metal sheet 200. However, for the sodium-ion battery with a normal cap, corrosion will occur. The metal outside the cap reacts chemically with the external medium, resulting in corrosion and bubbling at the cap of the sodium-ion battery, which easily affects the safety performance of the battery and reduces the service life of the battery.

[0036] For the above-mentioned battery cap 10 with an anti-corrosion structure, by adding a protective layer 600 to cover the metal sheet 200 exposed outside the battery cap, that is, the protective layer 600 blocks the metal exposure area 201, so that the exposed part of the metal sheet 200 can be isolated from the external medium. Compared with the traditional battery cap, it can effectively prevent the direct contact between the metal outside the battery cap and the external medium, thereby reducing the probability of chemical reaction of the exposed part of the metal sheet 200 and causing metal corrosion, and improving the safety performance and service life of the battery.

[0037] As Figures 1 to 3 shown, in one of the embodiments, the projected area of the protective layer 600 on the metal sheet 200 is greater than or equal to the area of the metal exposure area 201. In this embodiment, the projected area of the protective layer 600 on the metal sheet 200 is greater than or equal to the area of the metal exposure area 201, that is, the protective layer 600 completely covers the metal exposure area 201 of the metal sheet 200 to completely isolate the metal exposure area 201 from the external medium and effectively prevent the direct contact between the metal exposure area 201 and the external medium.

[0038] As Figure 1 and Figure 2As shown, in one embodiment, the protective layer 600 is a waterproof coating layer. The waterproof coating layer is adhered to the metal sheet 200, and the thickness of the waterproof coating layer is 1 mm - 5 mm. In this embodiment, the material of the waterproof coating layer is a water-based asphalt-based waterproof coating. By completely coating the metal sheet 200 exposed outside the cap with the water-based asphalt-based waterproof coating, the metal sheet 200 outside the cap is isolated from direct contact with the external medium, effectively preventing the corrosion of the metal sheet 200 and improving the safety performance and service life of the battery. Further, the thickness of the waterproof coating layer is 1 mm - 5 mm. In this embodiment, the thickness of the waterproof coating layer is 3 mm. It can be understood that if the thickness of the waterproof coating layer is too thin, the protective effect of the waterproof coating layer is poor, and it cannot effectively isolate the metal sheet 200 from direct contact with the external medium, and it is easy to cause wear of the waterproof coating layer due to rubbing, further reducing the protective effect of the waterproof coating layer; if the thickness of the waterproof coating layer is too thick, the overall weight of the battery cap is too high, it cannot be adapted to the subsequent assembly of the battery, and it causes unnecessary material waste. In other embodiments, the material of the waterproof coating layer can also be polyurethane waterproof coating, water-based polyvinyl chloride tar waterproof coating, polyvinyl chloride elastic waterproof coating, soap solution emulsified asphalt, solvent-based rubber asphalt waterproof coating, asphalt-based waterproof materials, rubber and plastic waterproof materials, etc.

[0039] As Figure 1 and Figure 2 shown, in one embodiment, the protective layer 600 is a silver protective layer. The silver protective layer is electroplated on the metal sheet 200, and the thickness of the silver protective layer is 1 mm - 5 mm. In this embodiment, the silver protective layer is composed of metallic silver. By plating silver on the metal sheet 200 outside the cap, the metal sheet 200 outside the cap is isolated from direct contact with the external medium, effectively preventing the corrosion of the metal sheet 200 and improving the safety performance and service life of the battery. Further, the thickness of the silver protective layer is 1 mm - 5 mm. In this embodiment, the thickness of the silver protective layer is 3 mm. It can be understood that if the thickness of the silver protective layer is too thin, the protective effect of the silver protective layer is poor, and it cannot effectively isolate the metal sheet 200 from direct contact with the external medium, and it is easy to cause wear of the silver protective layer due to rubbing, further reducing the protective effect of the silver protective layer; if the thickness of the silver protective layer is too thick, the overall weight of the battery cap is too high, it cannot be adapted to the subsequent assembly of the battery, and it causes unnecessary material waste. In other embodiments, insoluble metal materials such as copper, lead, and nickel can also be plated on the metal sheet 200.

[0040] As Figure 1 and Figure 2As shown, in one embodiment, the insulating ring 300 is a rubber ring. In this embodiment, the insulating ring 300 is a rubber ring, and the rubber ring has good insulating properties. By arranging the rubber ring to be clamped and connected between the metal sheet 200 and the bottom cover 400, it can effectively prevent the electric energy inside the battery from leaking outside the cap, making the battery inside have higher stability, thereby improving the safety performance and service life of the battery.

[0041] As Figure 1 and Figure 2 As shown, in one embodiment, the sealing ring 500 is a rubber ring. In this embodiment, the sealing ring 500 is a rubber ring, and the rubber ring has good sealing properties. By arranging the rubber ring to surround and cover the periphery of the metal sheet 200 outside the cap, the sealing performance of the battery cap can be higher, effectively preventing external media from eroding the internal space of the battery, making the sealing and safety performance of the battery higher, and improving the safety performance and service life of the battery.

[0042] This application also provides a sodium-ion cylindrical battery, including the battery cap 10 with an anti-corrosion structure in any of the above embodiments.

[0043] Compared with the prior art, the present disclosure has at least the following advantages:

[0044] For the above-mentioned battery cap 10 with an anti-corrosion structure, by adding a protective layer 600 to cover the metal sheet 200 exposed outside the battery cap, that is, the protective layer shields the metal exposure area 201, so that the exposed part of the metal sheet 200 can be isolated from the external medium. Compared with the traditional battery cap, it can effectively prevent the direct contact between the metal outside the battery cap and the external medium, thereby reducing the probability of chemical reaction occurring on the exposed part of the metal sheet 200 and causing metal corrosion, and improving the safety performance and service life of the battery.

[0045] The above embodiments only represent several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several deformations and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A battery cap with an anti-corrosion structure, comprising a top cover, a metal sheet, an insulating ring, a bottom cover and a sealing ring. The metal sheet is electrically connected to the top cover and the bottom cover respectively. The metal sheet surrounds and wraps the periphery of the top cover and partially extends outside the top cover. The insulating ring is clamped and connected between the metal sheet and the bottom cover. The sealing ring surrounds and wraps the periphery of the metal sheet and the periphery of the bottom cover. The sealing ring is also hermetically connected to the bottom cover to form a metal exposure area on the metal sheet. It is characterized in that, The battery cap with an anti-corrosion structure further comprises a protective layer. The protective layer is located outside the top cover and connected to the metal sheet, and at least part of the protective layer is located within the metal exposure area.

2. The battery cap with an anti-corrosion structure according to claim 1, characterized in that, The projected area of the protective layer on the metal sheet is greater than or equal to the area of the metal exposure area.

3. The battery cap with an anti-corrosion structure according to claim 1, characterized in that, The protective layer is adhered to the metal sheet.

4. The battery cap with an anti-corrosion structure according to claim 3, characterized in that, The protective layer is a waterproof coating layer.

5. The battery cap with an anti-corrosion structure according to claim 4, wherein, The thickness of the waterproof coating layer is 1 mm - 5 mm.

6. The battery cap with an anti-corrosion structure according to claim 1, wherein, The protective layer is electroplated on the metal sheet.

7. The battery cap with an anti-corrosion structure according to claim 6, characterized in that, The protective layer is a silver protective layer.

8. The battery cap with an anti-corrosion structure according to claim 7, wherein, The thickness of the silver protective layer is 1 mm - 5 mm.

9. The battery cap with an anti-corrosion structure according to claim 1, characterized in that, The insulating ring and the sealing ring are rubber rings.

10. A sodium-ion cylindrical battery, comprising the battery cap with an anti-corrosion structure according to any one of claims 1 - 9.

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