Battery top cover and battery

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a battery top cover and a battery, the battery top cover comprises a substrate, the substrate is provided with a first mounting hole and a second mounting hole, the inner side of the first mounting hole and the inner side of the second mounting hole are provided with sealing elements, and the first mounting hole and the second mounting hole are provided with sealing elements. One of the first mounting hole and the second mounting hole is provided with a positive pole, the other one of the first mounting hole and the second mounting hole is provided with a negative pole, the upper ends and the lower ends of the positive pole and the negative pole protrude out of the substrate, and the positive pole and the negative pole are sleeved with the sealing element. The battery cover plate can solve the problem of sealing the positive and negative poles of the battery cover plate, improves the safety performance, and is simple in structure and high in air tightness and safety.

Description

Technical Field

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

[0002] With the energy crisis and climate warming worldwide, there is an urgent need for a new energy model in the transportation field. Lithium-ion batteries have attracted wide attention in the transportation field due to their green environmental protection and high energy output. At present, relevant industries worldwide have carried out extensive research on the application of lithium-ion batteries in this field. With the maturity and increasing improvement of electric vehicle technology, the dream of electric vehicles and hybrid vehicles entering daily life has become possible, and huge business opportunities are emerging during the popularization of electric vehicles. The performance of in-vehicle large-capacity power batteries directly affects the overall performance of electric vehicles. This poses higher requirements for in-vehicle power batteries of electric vehicles, such as higher safety, better performance, and lighter weight.

[0003] Currently, the reliability and safety of batteries are also technical difficulties and key points in the production process of large-capacity power batteries. Especially the high sealing performance during the battery production process. Now, large-capacity batteries have more stringent requirements for battery airtightness. If the battery capacity is high, the internal pressure of the battery is relatively high, which makes the assembled parts of the battery prone to liquid leakage or air leakage, causing great potential safety hazards to the battery and problems such as electrolyte volatilization and battery performance and life attenuation. In addition, when a lithium battery is in use, if the sealing performance between the battery terminal and the sealing ring is not good, moisture in the air will be inhaled into the battery and mixed with the electrolyte inside the battery, or the electrolyte inside the battery will volatilize and dry up to form crystals, which will lead to the attenuation of battery performance and cycle life, an increase in internal resistance, affecting various parameter performances of the lithium battery, and ultimately resulting in the battery being unable to continue to be used. In severe cases, it will also cause battery safety problems.

[0004] Based on this, there is an urgent need in this field for a battery top cover and a battery to solve the above technical problems. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to solve the above problems and provide a battery top cover and a battery.

[0006] To solve the above technical problems, the utility model provides a battery top cover, including a substrate, on which a first mounting hole and a second mounting hole are provided. Sealing members are provided inside the first mounting hole and the second mounting hole. One of the first mounting hole and the second mounting hole is equipped with a positive electrode column, and the other is equipped with a negative electrode column. The upper and lower ends of the positive electrode column and the negative electrode column protrude from the substrate, and the sealing member is sleeved on the positive electrode column and the negative electrode column.

[0007] As a further improvement of the present utility model, the material of the seal is polyamide-imide type plastic.

[0008] As a further improvement of the present utility model, a third mounting hole is further provided between the first mounting hole and the second mounting hole, and an explosion-proof valve is installed in the third mounting hole.

[0009] As a further improvement of the present utility model, a back plate is covered on the lower end surface of the substrate, a first annular groove is provided on the lower end surface of the substrate, and a first protruding portion is provided in the first annular groove; a second protruding portion adapted to the first annular groove is provided on the upper end surface of the back plate, and a second annular groove adapted to the first protruding portion is provided in the second protruding portion.

[0010] As a further improvement of the present utility model, the material of the back plate is alumina ceramic.

[0011] As a further improvement of the present utility model, an inner groove is provided on one side of the first mounting hole and the second mounting hole, and a liquid injection hole is provided in the inner groove.

[0012] As a further improvement of the present utility model, a sealing nail is provided in the liquid injection hole, the sealing nail includes a sealing portion and a fixing portion, and the sealing portion is arranged at the lower end of the fixing portion; an internal thread is provided in the liquid injection hole, an external thread is provided on the periphery of the sealing portion, the liquid injection hole is in threaded fit connection with the sealing portion, and the fixing portion is heat-melted in the inner groove.

[0013] As a further improvement of the present utility model, the first mounting hole and the second mounting hole are stepped holes.

[0014] The present utility model also provides a battery, including the above-mentioned battery top cover.

[0015] As a further improvement of the present utility model, it further includes a battery case, and the material of the battery case is plastic.

[0016] The technical effect of the present utility model is: Compared with the prior art, a battery top cover provided by the present utility model has a first mounting hole and a second mounting hole on the substrate, a seal is provided on the inner sides of the first mounting hole and the second mounting hole, and the positive electrode column and the negative electrode column in the first mounting hole and the second mounting hole are sleeved with the seal. The force at the connection between the positive electrode column and the negative electrode column and the substrate is more uniform, which can solve the problem of sealing the positive and negative electrode columns of the battery cover, improve the safety performance, has a simple structure, and high airtightness and safety. By setting the material of the seal to be polyamide-imide type plastic, it can withstand higher temperature rise and pressure compared with polyethylene plastic in the prior art, and will not melt to cause liquid leakage, avoiding battery leakage and improving the safety performance of the battery. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only a part of the embodiments of the present invention, rather than all the embodiments. For those of ordinary skill in the art, without creative efforts, all other drawings obtained based on these drawings belong to the scope of protection of the present invention.

[0018] Figure 1 is a perspective view of a battery top cover provided by an embodiment of the present invention;

[0019] Figure 2 is an exploded view of a battery top cover provided by an embodiment of the present invention;

[0020] Figure 3 is a rear view of a substrate provided by an embodiment of the present invention.

[0021] Among them, 10 is a substrate, 11 is a first mounting hole, 12 is a second mounting hole, 13 is a seal, 14 is a positive electrode post, 15 is a negative electrode post, 16 is a third mounting hole, 161 is an explosion-proof valve, 17 is a first annular groove, 171 is a first protrusion, 18 is an inner groove, 181 is a liquid injection hole, 1811 is a sealing nail, 18111 is a sealing part, 18112 is a fixing part, 20 is a back plate, 21 is a second protrusion, and 211 is a second annular groove. Detailed implementation manners

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the following will further elaborate on the present invention in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the embodiments and specific examples of the present invention; however, this is not the only form for implementing or applying the specific embodiments of the present invention. The embodiments cover the features of multiple specific embodiments and the method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.

[0026] In the description of the present utility model, the orientation or positional relationship indicated by the terms "front", "rear", "top", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] Please refer to Figures 1 - 3 , an embodiment of the present utility model provides a battery top cover to solve the problem of poor sealing of the battery pole column.

[0028] Specifically, please refer to Figure 1 is a perspective view of a battery top cover provided by an embodiment of the present utility model. The present utility model provides a battery top cover, including a substrate 10. The shape of the substrate 10 is rectangular. The substrate 10 is provided with a first mounting hole 11 and a second mounting hole 12. The first mounting hole 11 and the second mounting hole 12 are disposed at both ends of the substrate 10. A sealing member 13 is provided inside the first mounting hole 11 and the second mounting hole 12. One of the first mounting hole 11 and the second mounting hole 12 is provided with a positive electrode column 14, and the other of the first mounting hole 11 and the second mounting hole 12 is provided with a negative electrode column 15. It can be understood that when the first mounting hole 11 is provided with the positive electrode column 14, the second mounting hole 12 is provided with the negative electrode column 15, and when the second mounting hole 12 is provided with the positive electrode column 14, the first mounting hole 11 is provided with the negative electrode column 15. The upper and lower ends of the positive electrode column 14 and the negative electrode column 15 protrude from the substrate 10, and the sealing member 13 is sleeved on the positive electrode column 14 and the negative electrode column 15.

[0029] It should be noted that a seal 13 is provided inside the first mounting hole 11 and the second mounting hole 12. The shape of the seal 13 can be sheet-like. The sheet-like seal 13 fits against the inner walls of the first mounting hole 11 and the second mounting hole 12 to seal the connection between the positive electrode post 14 and the negative electrode post 15 and the substrate 10. Or the shape of the seal 13 can also be ring-shaped. The outer wall of the ring-shaped seal 13 fits against the inner walls of the first mounting hole 11 and the second mounting hole 12 to seal the connection between the positive electrode post 14 and the negative electrode post 15 and the substrate 10. Further, a plurality of the ring-shaped seals 13 can be provided. The plurality of ring-shaped seals 13 are arranged at intervals, and the outer walls of the plurality of ring-shaped seals 13 all fit against the inner walls of the first mounting hole 11 and the second mounting hole 12 to seal the connection between the positive electrode post 14 and the negative electrode post 15 and the substrate 10, further improving the sealing effect.

[0030] A battery top cover provided by the present utility model has a first mounting hole 11 and a second mounting hole 12 provided on a substrate 10, and a seal 13 is provided inside the first mounting hole 11 and the second mounting hole 12. The positive electrode post 14 and the negative electrode post 15 in the first mounting hole 11 and the second mounting hole 12 are sleeved with the seal 13. The force at the connection between the positive electrode post 14 and the negative electrode post 15 and the substrate 10 is more uniform, which can solve the problem of sealing the positive and negative electrode posts 15 of the battery cover plate, improve the safety performance, has a simple structure, and high airtightness and safety.

[0031] As a further improvement of the present utility model, the material of the seal 13 is polyamide-imide type plastic. By setting the material of the seal 13 to be polyamide-imide type plastic, compared with polyethylene plastic in the prior art, it can withstand higher temperature rise and pressure, and will not melt to cause liquid leakage, avoiding battery leakage and improving the safety performance of the battery.

[0032] As a further improvement of the present utility model, a third mounting hole 16 is further provided between the first mounting hole 11 and the second mounting hole 12 for mounting an explosion-proof valve 161 to prevent explosion and improve the safety performance.

[0033] As a further improvement of the present utility model, please refer to Figures 2 - 3, a backplane 20 is provided on the lower end face of the substrate 10. A first annular groove 17 is provided on the lower end face of the substrate 10, and a first protrusion 171 is provided in the first annular groove 17; a second protrusion 21 adapted to the first annular groove 17 is provided on the upper end face of the backplane 20, and a second annular groove 211 adapted to the first protrusion 171 is provided in the second protrusion 21. By providing the first annular groove 17 on the lower end face of the substrate 10 and the first protrusion 171 in the first annular groove 17; providing the second protrusion 21 adapted to the first annular groove 17 on the upper end face of the backplane 20 and the second annular groove 211 adapted to the first protrusion 171 in the second protrusion 21, when the backplane 20 and the substrate 10 are installed and assembled, the first annular groove 17 is fixedly engaged with the second protrusion 21, and the first protrusion 171 is engaged with the second annular groove 211, ensuring the connection stability between the backplane 20 and the substrate 10.

[0034] As a further improvement of the present invention, the material of the backplane 20 is alumina ceramic. By setting the material of the backplane 20 to be alumina ceramic, the hardness of the battery top cover is improved, the melting point of the back of the cover plate is increased, and since alumina ceramic has the characteristics of high temperature resistance and corrosion resistance, the high temperature resistance performance of the battery top cover can be further improved, and its good insulation property reduces the possibility of electric leakage and improves the safety performance.

[0035] As a further improvement of the present invention, an inner groove 18 is provided on one side of the first mounting hole 11 and the second mounting hole 12, and a liquid injection hole 181 is provided in the inner groove 18 to facilitate the smooth pouring of the battery liquid. By providing the liquid injection hole 181 in the inner groove 18, it is ensured that the battery liquid can be accurately poured into the liquid injection hole 181 when pouring the battery liquid, avoiding flowing to other positions and requiring cleaning, which affects the processing efficiency.

[0036] As a further improvement of the present utility model, a sealing nail 1811 is arranged in the liquid injection hole 181. The sealing nail 1811 includes a sealing part 18111 and a fixing part 18112. The sealing part 18111 is arranged at the lower end of the fixing part 18112. An internal thread is provided in the liquid injection hole 181, and an external thread is provided on the circumferential side of the sealing part 18111. The liquid injection hole 181 is in threaded fit connection with the sealing part 18111, and the fixing part 18112 is heat-melted in the inner groove 18. By arranging the sealing nail 1811 in the liquid injection hole 181, after the battery liquid is poured, the sealing nail 1811 can better seal the liquid injection hole 181. An inner groove 18 is arranged on the substrate 10. Generally, the inner groove 18 is circular and is concentric with the liquid injection hole 181. The sealing part 18111 of the sealing nail 1811 is inserted into the liquid injection hole 181, and the sealing part 18111 can seal the liquid injection hole 181.

[0037] As a further improvement of the present utility model, the first mounting hole 11 and the second mounting hole 12 are stepped holes. By setting the first mounting hole 11 and the second mounting hole 12 as stepped holes, the sealing member 13 can be better fixed, preventing the sealing member 13 from falling off, further enhancing the sealing of the connection between the positive electrode post 14 and the negative electrode post 15 and the substrate 10 by the sealing member 13, and improving the safety performance.

[0038] The present utility model also provides a battery. The battery includes a battery case and the above-mentioned battery top cover. The battery has all the beneficial effects of the battery top cover. The material of the battery case is plastic, which improves the safety performance of the battery.

[0039] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0040] The above embodiments only represent the preferred embodiments of the present utility model. The description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A battery top cover, characterized in that: It includes a substrate, a first mounting hole and a second mounting hole are provided on the substrate, a sealing member is provided inside the first mounting hole and the second mounting hole, a positive electrode column is installed in one of the first mounting hole and the second mounting hole, a negative electrode column is installed in the other of the first mounting hole and the second mounting hole, upper and lower ends of the positive electrode column and the negative electrode column protrude from the substrate, and the sealing member is sleeved on the positive electrode column and the negative electrode column.

2. The battery top cover according to claim 1, characterized in that: The sealing element is made of polyamide-imide plastic.

3. The battery top cover according to claim 1, characterized in that: A third mounting hole is further provided between the first mounting hole and the second mounting hole, and an explosion-proof valve is installed in the third mounting hole.

4. The battery top cover according to claim 1, characterized in that: The lower end surface of the substrate is covered with a back plate, and the lower end surface of the substrate is provided with a first annular groove, and a first protrusion is provided in the first annular groove; the upper end surface of the back plate is provided with a second protrusion matching with the first annular groove, and a second annular groove adapted to the first protrusion is provided in the second protrusion.

5. The battery top cover according to claim 4, characterized in that: The material of the back plate is alumina ceramic.

6. The battery top cover according to claim 1, characterized in that: An inner groove is provided on one side of the first mounting hole and the second mounting hole, and a liquid injection hole is provided in the inner groove.

7. The battery top cover according to claim 6, characterized in that: A sealing nail is arranged in the injection hole, and the sealing nail includes a sealing part and a fixing part, and the sealing part is arranged at the lower end of the fixing part; an internal thread is arranged in the injection hole, and an external thread is arranged on the peripheral side of the sealing part; the injection hole is threadedly connected with the sealing part, and the fixing part is hot-melted in the inner groove.

8. The battery top cover according to claim 1, characterized in that: The first mounting hole and the second mounting hole are stepped holes.

9. A battery, characterized in that: It comprises a battery casing and a battery top cover as claimed in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that The battery housing is made of plastic.

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