Battery top cover and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery, the battery top cover comprises a cover body and an explosion-proof valve, the top surface of the cover body is provided with a boss, the boss is provided with a placing groove for accommodating the explosion-proof valve, and the top surface of the boss is hermetically connected with a protective film for sealing the placing groove and covering the explosion-proof valve. The boss is arranged on the top face of the cover body, the containing groove is formed in the boss, so that the anti-explosion valve can be contained in the containing groove, the top face of the boss is covered with the protective film to close the containing groove, and therefore the anti-explosion valve is covered, the boss and the protective film can prevent electrolyte from immersing during liquid injection, pollution and corrosion of the anti-explosion valve are avoided, and the service life of the anti-explosion valve is prolonged. And the use effect of the anti-explosion valve is ensured. The utility model also discloses a battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a battery. Background Art

[0002] With the progress of technology, battery technology is also constantly innovating. The application of new materials and new processes has significantly improved the performance of batteries such as energy density, cycle life, and safety. It plays an important role in the fields of transportation, energy storage equipment, communication, electronic products, etc.

[0003] In order to better enjoy the convenience brought by the battery and ensure safety during use, safety is an important factor that must be considered in the design and use of the battery. Among them, lithium batteries are widely used due to their advantages such as high energy density, low self-discharge rate, long cycle life, and environmental friendliness. An explosion-proof valve is usually set in the battery top cover, and the explosion-proof valve is used as a key protection device to ensure the safety of lithium batteries.

[0004] However, during the production and manufacturing process of existing lithium batteries, it is inevitable that electrolyte overflows during liquid injection, resulting in the explosion-proof valve being easily contaminated or even corroded by the electrolyte, thereby affecting the pressure relief value of the explosion-proof valve and bringing potential safety hazards, reducing the safety of lithium batteries. Summary of the Utility Model

[0005] One of the purposes of the utility model is to provide a battery top cover. Aiming at the deficiencies of the above-mentioned existing technologies, it aims to solve the technical problem of potential safety hazards caused by electrolyte contamination and corrosion of the explosion-proof valve during liquid injection of lithium batteries.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A battery top cover includes a cover body and an explosion-proof valve. A boss is provided on the top surface of the cover body. A placement groove for accommodating the explosion-proof valve is provided in the boss. A protective film is hermetically connected to the top surface of the boss to seal the placement groove and cover the explosion-proof valve.

[0008] The utility model is further provided that: an adhesive patch is pasted on the bottom surface of the protective film, and the adhesive patch is bonded to the top surface of the boss to hermetically fix the protective film and the boss.

[0009] The utility model is further provided that: a pressure relief hole is provided below the placement groove, and the placement groove is communicated with the pressure relief hole.

[0010] The utility model is further provided that: there is an extension section between the edge of the pressure relief hole and the edge of the placement groove, and the explosion-proof valve is placed above the extension section.

[0011] The utility model is further provided that: the set height of the top surface of the extension section is lower than the set height of the top surface of the cover body.

[0012] The present utility model is further configured such that there is a gap for welding and fixing the explosion-proof valve between the side surface of the explosion-proof valve and the side surface of the placement groove.

[0013] The present utility model is further configured such that the top surface of the explosion-proof valve and the top surface of the boss are coplanar, and the adhesive patch covers the top surfaces of the boss and part of the explosion-proof valve so that the adhesive patch covers the gap.

[0014] The present utility model is further configured such that the boss has an upper surface which is a horizontally connected horizontal plane, and the adhesive patch and the protective film are sequentially attached to the upper surface.

[0015] The present utility model is further configured such that the boss further has a vertical outer side surface which is a horizontal plane or a concave curved surface.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] The present utility model includes a cover body and an explosion-proof valve. A boss is provided on the top surface of the cover body. The boss is provided with a placement groove for accommodating the explosion-proof valve. The top surface of the boss is hermetically connected with a protective film to seal the placement groove and cover the explosion-proof valve. In the present application, by providing a boss on the top surface of the cover body and providing a placement groove on the boss, the explosion-proof valve can be accommodated in the placement groove, and then the placement groove is closed by covering the top surface of the boss with the protective film, so as to cover the explosion-proof valve. When injecting liquid, the boss and the protective film can block the intrusion of the electrolyte, avoid the pollution and corrosion of the explosion-proof valve, and ensure the use effect of the explosion-proof valve.

[0018] The second object of the present utility model is to provide a battery, which includes a housing and the above-mentioned battery top cover, and the battery top cover is covered above the housing. Since the battery adopts the above-mentioned battery top cover structure, the battery of the present application can also solve the problem that the explosion-proof valve is contaminated by the electrolyte, can avoid the safety hazard caused by the influence on the explosion-proof valve, and improves the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is the overall structural schematic diagram of the battery top cover in the present utility model;

[0021] Figure 2 is the cross-sectional view of the battery top cover in the present utility model;

[0022] Figure 3 is Figure 2The enlarged view at position A in [Chinese context];

[0023] Figure 4 is a schematic structural view of the cover body in the present utility model;

[0024] Figure 5 is a schematic view of the overall structure of the battery in the present utility model.

[0025] The details of the reference numerals involved in the above-mentioned drawings are as follows:

[0026] 1 - Battery, 2 - Housing, 3 - Battery top cover;

[0027] 4 - Cover body, 41 - Boss, 411 - Upper surface, 412 - Outer side surface, 42 - Placing groove, 43 - Pressure relief hole, 44 - Extension section, 45 - Gap, 46 - Liquid injection hole;

[0028] 5 - Explosion-proof valve, 6 - Protective film, 7 - Adhesive patch. Detailed implementation manners

[0029] In the description of the present application, terms such as "installation", "connection", "coupling", "fixing", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "coupling" can be a direct coupling or an indirect coupling through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] In the description of the present application, technical terms such as "center", "longitudinal", "transverse", "vertical", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application.

[0031] In order to more clearly understand the above objects, technical solutions, and advantages of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application, and a detailed understanding of how to solve the problems proposed in the above background technology will be obtained.

[0032] At present, the battery 1 generally includes a housing 2, an electrode core, and a battery top cover 3. The electrode core is disposed within the housing 2, and the battery top cover 3 is disposed at the opening of the housing 2 for sealing the housing 2. A pole column is penetrated through the battery top cover 3, and the pole ear on the electrode core is connected to the pole column to achieve electrical conduction between the inside and the outside of the battery 1. An explosion-proof valve 5 is provided on the battery top cover 3. When the internal air pressure of the battery 1 is relatively large, the battery 1 will open the explosion-proof valve 5 to discharge the gas outside the housing 2.

[0033] However, during the production and manufacturing process of the existing lithium battery 1, it is inevitable that the electrolyte overflows during liquid injection, resulting in the explosion-proof valve 5 being easily contaminated or even corroded by the electrolyte, thus affecting the explosion-proof valve 5 and bringing potential safety hazards.

[0034] To solve the above technical problems, the present utility model provides a battery top cover 3. A boss 41 capable of installing the explosion-proof valve 5 is provided on the cover body 4, which can effectively prevent the electrolyte from flowing into the explosion-proof valve 5 and causing contamination and corrosion. It should also be noted that in the present utility model, the side of the battery top cover 3 away from the housing 2 is the upper side, and the side of the battery top cover 3 close to the housing 2 is the lower side to define up and down. At the same time, the explosion-proof valve 5 is a light aluminum sheet explosion-proof valve, which can be composed of a support ring and an explosion-proof sheet.

[0035] In a first aspect, please refer to Figures 1 to 4 , the present utility model provides a battery top cover 3, including a cover body 4 and an explosion-proof valve 5. A boss 41 is provided on the top surface of the cover body 4. The boss 41 is provided with a placement groove 42 for accommodating the explosion-proof valve 5. A protective film 6 is hermetically connected to the top surface of the boss 41 to seal the placement groove 42 and cover the explosion-proof valve 5.

[0036] Specifically, including but not limited to, the cover body 4 is a rectangular plate formed by stamping. The boss 41 is arranged at the center of the cover body 4. The boss 41 can be integrally formed with the cover body 4 by stamping or a split structure by welding. In this embodiment, the boss 41 is set as an elliptical ring structure. Of course, in actual production, the boss 41 can also be set as a circle, a square, etc. according to production needs to better match different shapes and structures of the explosion-proof valve 5 and realize the installation of the explosion-proof valve 5. The boss 41 extends vertically upward along the top surface of the cover plate, and a placement groove 42 is opened on the boss 41. The explosion-proof valve 5 can be accommodated in the placement groove 42. It should be noted that the placement groove 42 opened on the boss 41 penetrates the entire boss 41 and partially penetrates into the cover body 4, that is, the bottom surface of the placement groove 42 is lower than the top surface of the cover body 4. In this embodiment, the protective film 6 can cover the entire placement groove 42, thereby sealing the placement groove 42 and covering the explosion-proof valve 5. The protective film 6 can play a role in sealing the entire placement groove 42, so as to protect the explosion-proof valve 5 when the boss 41 blocks the electrolyte. The protective film 6 also covers the welding area of the explosion-proof valve 5, which can prevent the electrolyte or other substances from polluting and corroding and reducing the weld strength. In some embodiments, the protective film can also cover the entire boss 41 to further enhance the sealing and protection effect of the explosion-proof valve 5.

[0037] Through the above solution, the placement groove 42 and the protective film 6 cooperate with each other to be closed, which can prevent the intrusion of the electrolyte during liquid injection, avoid the pollution and corrosion of the explosion-proof valve 5, and ensure the use effect of the explosion-proof valve 5.

[0038] As a specific improvement embodiment, in this embodiment, a liquid injection groove is also opened on the battery top cover 3, and a liquid injection hole 46 for liquid injection is opened on the liquid injection groove. When starting to inject liquid into the liquid injection hole 46, the inner wall of the liquid injection groove can form a preliminary liquid blocking effect, which can further improve the liquid blocking effect.

[0039] As a specific improvement embodiment, an adhesive patch 7 is pasted on the bottom surface of the protective film 6, and the adhesive patch 7 is adhered to the top surface of the boss 41 to seal and fix the protective film 6 and the boss 41.

[0040] Specifically, including but not limited to, such as Figure 1 and Figure 3As shown, in this embodiment, the protective film 6 can be selected as a protective film 6 well-known to those skilled in the art, and no definition is given here. For example: polyester film, biaxially oriented polypropylene film, polyvinylidene fluoride film, etc. At the same time, the adhesive patch 7 can also be selected as an adhesive patch 7 well-known to those skilled in the art, and no definition is given here. For example: polyimide film substrate, polypropylene film substrate, double-layer composite substrate, etc. The selection of the above two materials must have excellent insulation, heat resistance, and electrolyte corrosion resistance. Of course, it can also be selected according to actual production needs; the adhesive patch 7 is also set as an oval ring structure. The adhesive patch 7 corresponds to the convex platform 41, so that the outer edge of the adhesive patch 7 is tangent to the outer edge of the convex platform 41, and the adhesive part of the adhesive patch 7 covers the entire top of the convex platform 41 and then extends inward. Based on this, the entire convex platform 41 and the protective film 6 are hermetically connected through the adhesive patch 7 to ensure the adhesive area and adhesive effect with the convex platform 41.

[0041] Through the above solution, the setting of the convex platform 41 can improve the structural strength, and at the same time, the adhesive patch 7 can tightly connect the protective film 6 and the convex platform 41 to prevent the protective film 6 from falling off and the intrusion of the electrolyte.

[0042] As a specific embodiment of the improvement, a pressure relief hole 43 is opened below the placement groove 42, and the pressure relief hole 43 communicates with the placement groove 42 below.

[0043] Specifically, including but not limited to, such as Figure 3 and Figure 4 As shown, a pressure relief hole 43 is provided corresponding to the cover body 4 in the placement groove 42, and the pressure relief hole 43 is provided below the placement groove 42, that is, the pressure relief hole 43 extends vertically along the lower part of the cover body 4 until the pressure relief hole 43 can penetrate the cover body 4. It should be noted that the overall size of the pressure relief hole 43 is smaller than the overall size of the placement groove 42, that is, the projection of the pressure relief hole 43 on the cover body 4 should be within the projection range of the placement groove 42 on the cover body 4. Then, when the explosion-proof valve 5 is placed in the placement groove 42, it can ensure that the gas inside the housing 2 can quickly pass through the pressure relief hole 43.

[0044] Through the above solution, the pressure relief hole 43 can penetrate the cover body 4, so that the pressure relief hole 43 can communicate with the inside of the housing 2, ensuring that when the internal air pressure is relatively large, the explosion-proof valve 5 protection device can be immediately triggered to achieve rapid pressure relief.

[0045] As a specific embodiment of the improvement, there is an extension section 44 between the edge of the pressure relief hole 43 and the edge of the placement groove 42, and the explosion-proof valve 5 is placed above the extension section 44.

[0046] Specifically, including but not limited to, the extension section 44 can be used to place the support ring of the explosion-proof valve 5, so that while the explosion-proof valve 5 is accommodated in the placement groove 42, the entire pressure relief hole 43 directly faces the explosion-proof sheet of the explosion-proof valve 5, avoiding the flow resistance of the gas formed by the placement groove 42, enabling the explosion-proof valve 5 to be quickly opened, and the gas to be discharged from the placement groove 42, ensuring the stability and rationality of the structure.

[0047] As a specific implementation of the improvement, the set height of the top surface of the extension section 44 is lower than the set height of the top surface of the cover body 4.

[0048] Specifically, including but not limited to, since the bottom surface of the placement groove 42 is lower than the top surface of the cover body 4, and the bottom surface of the placement groove is the top surface of the extension section at this time, the set height of the top surface of the extension section 44 is lower than the set height of the top surface of the cover body 4. Then, when the thickness of the explosion-proof valve 5 is the same, the height of the boss 41 can be reduced, thereby reducing the overall thickness of the battery top cover 3, which is beneficial to improving the energy density of the battery 1.

[0049] As a specific implementation of the improvement, there is a gap 45 between the side surface of the explosion-proof valve 5 and the side surface of the placement groove 42 for welding and fixing the explosion-proof valve 5.

[0050] Specifically, including but not limited to, the setting of the placement groove 42 can also perform preliminary limit fixation on the explosion-proof valve 5, which is beneficial to the positioning installation and welding of the explosion-proof valve 5. Then, to ensure that the explosion-proof valve 5 is accommodated in the placement groove 42, it is necessary to ensure that the overall size of the explosion-proof valve 5 is smaller than the overall size of the placement groove 42. Therefore, there is a gap 45 between their side surfaces. This gap 45 can be used to weld and fix the explosion-proof valve 5, and the placement groove 42 can also form a preliminary positioning for the welding of the explosion-proof valve 5. After the gap 45 is filled by welding, the fixed connection between the explosion-proof valve 5 and the cover body 4 is realized, which can prevent the shaking and falling off of the explosion-proof valve 5.

[0051] As a specific implementation of the improvement, the top surface of the explosion-proof valve 5 and the top surface of the boss 41 are coplanar, and the adhesive patch 7 covers the top surfaces of the boss 41 and part of the explosion-proof valve 5 so that the adhesive patch 7 covers the gap 45.

[0052] Specifically, including but not limited to, the overall thickness of the explosion-proof valve 5 is the same as the opening depth of the placement groove 42, ensuring that the explosion-proof valve 5 can be integrally accommodated in the placement groove 42. At this time, the top surface of the explosion-proof valve 5 and the top surface of the boss 41 are on the same horizontal plane, and while the adhesive patch 7 covers the boss 41, it also extends inward partially, that is, the adhesive patch 7 also covers part of the top surface of the explosion-proof valve 5. Therefore, in this embodiment, the adhesive patch 7 can cover part of the support ring of the explosion-proof valve 5, thereby covering the gap 45, which can further limit and fix the explosion-proof valve 5 and improve the sealing performance. At this time, the adhesive patch 7 and the protective film 6 cover the gap 45 in sequence, which can avoid the pollution of the welding part.

[0053] As a specific embodiment of the improvement, the boss 41 has an upper surface 411, and the upper surface 411 is a horizontally connected horizontal plane. The adhesive patch 7 and the protective film 6 are sequentially attached to the upper surface 411.

[0054] Specifically, including but not limited to, in this embodiment, the horizontal direction is along the length direction of the battery top cover 3, and the upper surface 411 of the boss 41 is set as a flat horizontal plane, which is beneficial to the adhesion between the boss 41 and the adhesive patch 7. When the set height of the boss 41 reaches the minimum value, it can avoid wrinkles on the adhesive patch 7 or the protective film 6 and ensure the sealing effect between the boss 41 and the protective film 6 and the adhesive patch 7.

[0055] As a specific embodiment of the improvement, the boss 41 also has a vertical outer side surface 412, and the outer side surface 412 is a horizontal plane or a concave curved surface.

[0056] Specifically, including but not limited to, in this embodiment, the vertical direction is along the height direction of the battery top cover 3, and the outer curved surface of the boss 41 is a flat horizontal plane, which can form a dike-breaking liquid-blocking structure. The side surfaces of the adhesive patch 7 or / and the protective film 6 are coplanar with the outer side surface 412 of the boss 41, which can enhance the liquid-blocking effect of the boss 41. In some embodiments, the outer side surface 412 can also be set as a concave curved surface. At this time, the connection part between the boss 41 and the cover body 4 can be set as a curved surface, and the upward extending part of the curved surface along the outer side surface 412 forms a landslide-type liquid-blocking structure, thereby enhancing the liquid-blocking effect of the boss 41.

[0057] In a second aspect, referring to Figure 5 , the present invention also provides a battery 1, which includes a housing 2 and any of the above battery top covers 3. There is an electric core (not shown) in the housing 2, and the battery top cover 3 is arranged at the opening of the housing 2. A boss 41 is provided on the cover body 4 of the battery top cover 3, a placement groove 42 is opened on the boss 41, an explosion-proof valve 5 is arranged in the placement groove 42, a pressure relief hole 43 is arranged below the explosion-proof valve 5, and the pressure relief hole 43 is communicated with the inside of the housing 2 of the battery 1. Finally, the protective film 6 covers the entire upper part of the boss 41, thereby solving the problem that the explosion-proof valve 5 is polluted by the electrolyte, avoiding potential safety hazards caused by the explosion-proof valve 5 being affected, having good sealing performance and high safety.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. Any technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and retouches should also be regarded as within the protection scope of the present invention.

Claims

1. A battery top cover, characterized in that, It includes a cover body and an explosion-proof valve. A boss is provided on the top surface of the cover body. The boss is provided with a placement groove for accommodating the explosion-proof valve. A protective film is hermetically connected to the top surface of the boss to seal the placement groove and cover the explosion-proof valve.

2. The battery top cover according to claim 1, characterized in that, A sticking patch is pasted on the bottom surface of the protective film. The sticking patch is adhered to the top surface of the boss so that the protective film and the boss are hermetically fixed.

3. The battery top cover according to claim 2, characterized in that, A pressure relief hole is provided below the placement groove. The placement groove communicates with the pressure relief hole.

4. The battery top cover according to claim 3, characterized in that, There is an extension section between the edge of the pressure relief hole and the edge of the placement groove. The explosion-proof valve is placed above the extension section.

5. A battery top cover according to claim 4, characterized in that The set height of the top surface of the extension section is lower than the set height of the top surface of the cover body.

6. The battery top cover according to claim 4, characterized in that, There is a gap for welding and fixing the explosion-proof valve between the side surface of the explosion-proof valve and the side surface of the placement groove.

7. The battery top cover according to claim 6, wherein, The top surface of the explosion-proof valve and the top surface of the boss are coplanar. The sticking patch covers the top surfaces of the boss and part of the explosion-proof valve so that the sticking patch covers the gap.

8. The battery top cover according to claim 2, characterized in that, The boss has an upper surface. The upper surface is a horizontally connected horizontal plane. The sticking patch and the protective film are sequentially attached to the upper surface.

9. The battery top cover according to claim 8, characterized in that, The boss also has a vertical outer side surface. The outer side surface is a horizontal plane or a concave curved surface.

10. A battery, characterized in that, It includes a housing and the battery top cover according to any one of claims 1-9 above covered on the housing.

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