Battery cover plate and battery

Abstract

The utility model discloses a battery cover plate and a battery. The battery cover plate is connected with a pole of a battery cell and comprises a cover plate body, a second sealing plate and a first sealing piece, the cover plate body and the second sealing plate are arranged in a stacked mode, the vertical projection of the second sealing plate on the cover plate body at least covers 80% of the area of the cover plate body, the cover plate body is provided with a pole through hole, and the pole through hole is communicated with the first sealing piece. The second sealing plate is provided with a second through hole, and the position of the pole through hole is opposite to that of the second through hole; the second sealing plate is arranged around the first sealing piece, the first sealing piece is inserted into the pole through hole, the pole penetrates through the pole through hole, and the upper surface of the second sealing plate is attached to the lower surface of the cover plate. According to the battery cover plate and the battery provided by the invention, the sealing performance is relatively high, the electrolyte can be effectively prevented from flowing out from the interior of the battery shell, the conditions of short circuit and ignition of the battery are reduced, and the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a battery cover and a battery. Background Art

[0002] In existing battery cover technologies, gaps exist between the insulating plate and the sealant. When high voltage is applied to the battery, electrolyte can easily leak through the gaps and enter the gap between the terminal and the battery cover. This can create electrical contact between the terminal and the metal cover, leading to a short circuit and potential fire. Therefore, there is an urgent need for a battery cover with enhanced sealing properties to prevent electrolyte leakage and improve battery safety. Utility Model Content

[0003] The battery cover and battery provided in the present application can inhibit the electrolyte from flowing out from the inside of the battery shell, reduce the occurrence of short circuits and fires in the battery, and improve the safety of the battery.

[0004] The present application provides a battery cover plate connected to the pole of a battery cell. The cover plate body, a first sealant, and a second sealing plate are stacked, the cover plate body and the second sealing plate covering at least 80% of the cover plate body in its vertical projection. The cover plate body is provided with a pole through-hole for receiving the pole, and the second sealing plate is provided with a second through-hole, the pole through-hole being positioned opposite the second through-hole. The second sealing plate is arranged around the first sealant, the first sealant being inserted into the pole through-hole, and the upper surface of the second sealing plate is in contact with the lower surface of the cover plate. At least a portion of the first sealant covers the inner wall of the pole through-hole.

[0005] In the above embodiment, the second sealing plate's vertical projection on the cover body covers at least 80% of the cover body, effectively isolating the cover body from the battery cell and reducing the risk of short circuits. The first sealing member, located within the terminal through-hole, seals the gap between the terminal and the cover body, reducing the risk of electrolyte overflowing the battery cover, which could result in the terminal and cover body being immersed in electrolyte and causing a short circuit and spark, thereby improving battery safety.

[0006] In one embodiment, the first sealing member and the second sealing plate are integrally provided.

[0007] In one embodiment, the first sealing member and the second sealing plate are provided separately.

[0008] In one embodiment, the first sealing member includes a first circular ring and a second circular ring that are connected to each other and penetrate each other, the first circular ring is located in the pole through hole, the second circular ring is connected to the second sealing plate, and the outer diameter a of the first circular ring and the outer diameter b of the second circular ring satisfy: a<b.

[0009] In one embodiment, a first groove is provided on the side of the cover plate body facing the second sealing plate, and the second ring is embedded in the first groove; or a second groove is provided on the side of the second sealing plate facing the cover plate body, and the second ring is embedded in the second groove.

[0010] In one embodiment, the first seal includes a second sub-seal and a convex ring, the convex ring is fixedly connected to the side of the second sealing plate facing the cover plate body, the convex ring is connected to the second through hole, the convex ring is inserted into the pole through hole, and the second sub-seal is arranged on the inner wall of the convex ring.

[0011] In one embodiment, the first seal further includes a third sub-seal, and the third sub-seal is located between the inner wall of the pole through hole and the outer wall of the protruding ring.

[0012] In one embodiment, the first sealing member and the second sealing plate are made of the same material, and the first sealing member and the second sealing plate are fixedly connected by hot melting or adhesive bonding.

[0013] In one embodiment, the first sealing member and the second sealing plate are made of different materials, and the first sealing member and the second sealing plate are fixedly connected by hot melting or adhesive bonding.

[0014] In one embodiment, the first sealing member and the second sealing plate are made of the same material, and the first sealing member and the second sealing plate are an integrally formed structure.

[0015] An embodiment of the present application also provides a battery, which includes a shell, a battery cell and the above-mentioned battery cover, wherein the battery cover and the shell are combined to form a accommodating cavity, the battery cell is arranged in the accommodating cavity, and the second sealing plate is located between the battery cell and the cover body; the battery cell includes a pole, and the pole is passed through the pole through hole and the second through hole, at least part of the first sealing member is located between the outer wall of the pole and the inner wall of the pole through hole, and the first sealing member is used to seal the gap between the pole and the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a battery cover provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of another battery cover provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of another battery cover provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of another battery cover provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of another battery cover provided in an embodiment of the present application;

[0021] Figure 6 A schematic diagram of another battery cover provided in an embodiment of the present application;

[0022] Figure 7 A schematic diagram of a battery provided in an embodiment of the present application.

[0023] Reference numerals:

[0024] 100-pole; 1-cover body; 2-second sealing plate; 3-first sealing member; 101-pole through hole; 201-second through hole; 301-first sub-seal; 303-second sub-seal; 304-third sub-seal; 305-convex ring; 3021-first circular ring; 3022-second circular ring; 102-first groove; 202-second groove; 10-housing; 20-battery cell. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this application clearer, the present application is further described in detail with reference to the accompanying drawings.

[0026] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the", and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0027] References in this specification to "one embodiment" or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. The terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically stated.

[0028] Figure 1 A schematic diagram of the structure of a battery cover provided in an embodiment of the present application is shown in FIG. Figure 1As shown, an embodiment of the present application provides a battery cover that is connected to the battery cell's pole 100. The battery cover comprises: a cover body 1, a first sealing member 3, and a second sealing plate 2. The cover body 1 and the second sealing plate 2 are stacked, with the upper surface of the second sealing plate 2 abutting against the lower surface of the cover body 1. The cover body 1 is a metal plate and is provided with a pole through-hole 101 for passing the battery cell's pole. The second sealing plate 2 is provided with a second through-hole 201, with the pole through-hole 101 and the second through-hole 201 positioned opposite each other. Because the battery cell occupies a large portion of the battery space, the vertical projection of the second sealing plate 2 on the cover body 1 covers at least 80% of the area of ​​the cover body 1, thereby effectively isolating the cover body 1 from the battery cell and reducing the occurrence of short circuits. The battery cell's pole 100 passes through the second through-hole 201 and the pole through-hole 101 in sequence and is fixed to the battery cover. The second sealing plate 2 is disposed around the first sealing member 3, which is inserted into the terminal through-hole 101, so that the terminal 100 is tightly fitted with the first sealing member 3. The first sealing member 3, located within the terminal through-hole 101, can block the gap between the terminal 100 and the cover body 1, thereby reducing the possibility of electrolyte overflowing from the battery cover, which could result in the terminal 100 and the cover body 1 being immersed in the electrolyte and causing a short circuit and spark, thereby improving battery safety.

[0029] When assembling the battery, the upper surface of the second sealing plate 2 can be mounted in contact with the lower surface of the cover body 1 to reduce the risk of electrolyte entering between the cover body 1 and the second sealing plate 2 .

[0030] It is worth noting that the battery usually has two poles, including a positive pole and a negative pole. The above-mentioned battery cover includes two groups of through holes, namely the pole through hole 101 and the second through hole 201 that are positioned opposite each other as a group of through holes for the positive pole and the negative pole to pass through respectively. In this application, the positive pole and the negative pole can be passed through any group of through holes, and the two groups of through holes are not distinguished. The above-mentioned first seal 3 inserted into the pole through hole 101 can be understood as: part of the first seal 3 is inserted into the pole through hole 101, and it can also be understood as the first seal 3 is completely inserted into the pole through hole 101.

[0031] Please continue to refer to Figure 1 In one embodiment, the first seal 3 may include a first subseal 301. The first subseal 301 is an annular seal disposed on the inner wall of the electrode through-hole 101. When the electrode 100 is assembled in the electrode through-hole 101, the first subseal 301 is located between the outer wall of the electrode 100 and the inner wall of the electrode through-hole 101. The first subseal 301 blocks the gap between the electrode 100 and the electrode through-hole 101 to prevent the electrolyte from flowing out of the electrode through-hole 101.

[0032] When selecting the material for the first subseal 301, a flexible material can be chosen. During assembly, the pole 100, the cover body 1, and the first subseal 301 can be assembled using an interference fit. The pole 100 and the cover body 1 can simultaneously compress the first subseal 301. Because the first subseal 301 is flexible and deforms under compression, its two sides can closely adhere to the pole 100 and the cover body 1, respectively, improving sealing performance.

[0033] Figure 2 A schematic diagram of another battery cover provided in an embodiment of the present application is shown as follows: Figure 2 As shown, in another embodiment, the first seal 3 may include a first circular ring 3021 and a second circular ring 3022 that are concentrically arranged and interconnected. The first circular ring 3021 is located in the pole through-hole 101, and the second circular ring 3022 is fixedly connected to the second sealing plate 2. The diameter a of the first circular ring 3021 and the diameter b of the second circular ring 3022 satisfy: a<b, that is, the axial cross-section of the first seal 3 is T-shaped. When assembling the battery, the pole 100 passes through the second through-hole 201, the second circular ring 3022 and the first circular ring 3021 in sequence. The first circular ring 3021 is located between the outer wall of the pole 100 and the inner wall of the pole through-hole 101, and plays a sealing role to prevent the electrolyte from flowing out. In addition, since the outer diameter of the second circular ring 3022 is larger than that of the first circular ring 3021, the first seal 3 forms a step structure. If the electrolyte enters between the second sealing plate 2 and the cover body 1 from the peripheral side of the second sealing plate 2, it needs to bypass the second ring 3022 to reach the first ring 3021. In this way, the flow path of the electrolyte is longer, allowing the user to take timely measures when signs of accidental leakage are found.

[0034] When selecting the material for the first seal 3, a flexible material can be selected. This way, during assembly, the first ring 3021 is in an interference fit. The pole 100 and the cover body 1 can simultaneously squeeze the first ring 3021, causing it to deform, so that the two sides of the first ring 3021 fit tightly against the pole 100 and the cover body 1, respectively, improving sealing performance. At the same time, the second ring 3022 deforms under the pressure of the cover body 1 and the second sealing plate 2, and can also maintain a good fit with the cover body 1 and the second sealing plate 2, reducing the outflow of electrolyte.

[0035] Figure 3 A schematic diagram of another battery cover provided in an embodiment of the present application is shown as follows: Figure 3As shown, in a further embodiment, a first groove 102 may be provided on the side of the cover body 1 facing the second sealing plate 2. The first groove 102 is concentrically arranged with the pole through hole 101, and the first groove 102 is adapted to the second circular ring 3022 or its diameter is slightly smaller than the outer diameter of the second circular ring 3022. The second circular ring 3022 is embedded in the first groove 102. In this way, the lower surface of the cover body 1 and the lower surface of the first sealing member 3 form a flat surface, so that the second sealing plate 2 and the cover body 1 are more closely attached. At the same time, since the first sealing member 3 is flexible, the second circular ring 3022 and the first groove 102 can be assembled in an interference fit manner, which can reduce the situation where the electrolyte enters the first groove 102 and improve safety.

[0036] Figure 4 A schematic diagram of another battery cover provided in an embodiment of the present application is shown as follows: Figure 4 As shown, or in a parallel technical solution, a second groove 202 can also be provided on the side of the second sealing plate 2 facing the cover plate body 1. The second groove 202 is arranged concentrically with the second through hole 201, and the second groove 202 is adapted to the second ring 3022. The second ring 3022 is embedded in the second groove 202 to achieve the same sealing effect.

[0037] Figure 5 A schematic diagram of another battery cover provided in an embodiment of the present application is shown as follows: Figure 5 As shown, in another embodiment, the first seal 3 may include a second sub-seal 303 and a raised ring 305. The raised ring 305 is fixedly connected to the side of the second sealing plate 2 facing the cover body 1. The raised ring 305 and the second sealing plate 2 may be an integral structure. The raised ring 305 is inserted into the terminal through-hole 101, and the second sub-seal 303 is disposed on the inner wall of the raised ring 305. When the battery is assembled, the second sub-seal 303 is located between the outer wall of the terminal 100 and the inner wall of the raised ring 305, thereby blocking the gap between the terminal 100 and the raised ring 305 and preventing the outflow of electrolyte.

[0038] Figure 6 A schematic diagram of another battery cover provided in an embodiment of the present application is shown as follows: Figure 6 As shown, in a further embodiment, the first seal 3 may further include a third sub-seal 304, which is located between the inner wall of the terminal through-hole 101 and the outer wall of the protruding ring 305. The third sub-seal 304 can block the gap between the protruding ring 305 and the terminal through-hole 101, preventing the electrolyte between the second sealing plate 2 and the cover plate body 1 from flowing out of the terminal through-hole 101.

[0039] The first sealing member 3 and the second sealing plate 2 can be made of pressure-resistant materials such as fluororubber and polyphenylene sulfide (PPS). Fluororubber is highly chemically stable and offers the best media resistance of any elastomer currently available. PPS is a specialty engineering plastic with excellent overall performance. PPS offers excellent high-temperature resistance, corrosion resistance, radiation resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability, and superior electrical properties.

[0040] In one embodiment, the first sealing member 3 and the second sealing plate 2 can be integrally provided to achieve a strict seal and prevent the electrolyte from entering between the cover body 1 and the terminal 100. The first sealing member 3 and the second sealing plate 2 can be made of the same material, for example, both are made of fluororubber or both are made of PPS. The first sealing member 3 and the second sealing plate 2 are fixedly connected by hot melt or adhesive, or the first sealing member 3 and the second sealing plate 2 can also be an integrally molded structure.

[0041] Because fluororubber is more expensive than PPS, the second sealing plate 2 is larger than the first sealing member 3. In one embodiment, the first sealing member 3 and the second sealing plate 2 can be made of different materials. For example, the second sealing plate 2 can be made of the relatively low-cost PPS material, while the first sealing member 3 can be made of fluororubber, to reduce overall costs. The first sealing member 3 and the second sealing plate 2 can still be integrally formed. For example, the first sealing member 3 and the second sealing plate 2 can be adhesively bonded to form a single, integral component.

[0042] In other embodiments, the first sealing member 3 and the second sealing plate 2 may be provided separately, that is, they are not connected by bonding or hot-melt fixing.

[0043] In some of the aforementioned embodiments, the first circular ring 3021, the second circular ring 3022, the first subseal 301, the second subseal 303, and the third subseal 304 are preferably made of fluororubber, which is soft and can improve sealing performance. The second sealing plate 2 and the raised ring 305 are preferably made of PPS. The second subseal 303 and the third subseal 304 can also be fixedly connected to the raised ring 305 by adhesive bonding or hot melt.

[0044] Figure 7 A schematic diagram of a battery provided in an embodiment of the present application is shown in FIG. Figure 7As shown, an embodiment of the present application also provides a battery, which includes a shell 10, a battery cell 20 and a battery cover, and the battery cover is covered with the shell 10 and fixedly connected by welding to form a accommodating cavity. The battery cell 20 is arranged in the accommodating cavity, and the battery cell 20 is immersed in the electrolyte. The second sealing plate 2 is located between the battery cell and the cover body 1. The battery cell includes a pole 100, and the pole 100 is passed through the pole through-hole 101 and the second through-hole 201. At least part of the first sealing member 3 is located between the outer wall of the pole 100 and the inner wall of the pole through-hole 101. The first sealing member 3 is used to seal the gap between the pole 100 and the cover body 1. Specifically, the edge of the cover body 1 is welded to the edge of the shell opening. Although the second sealing plate 2 has a certain high temperature resistance, the welding temperature is much higher than the heating temperature of the battery. The vertical projection of the cover body 1 covers at least 80% of the area of ​​the cover body 1. During assembly, the second sealing plate 2 can be placed in the middle area of ​​the cover body 1, so that the edge of the cover body 1 is not blocked. This ensures better welding between the cover body 1 and the housing 10. In addition, the edge of the second sealing plate 2 is separated from the edge of the cover body by a certain distance. This prevents the high temperature of welding from damaging the second sealing plate 2, effectively isolating the battery cells 20 from the cover body 1, and improving battery reliability.

[0045] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A battery cover, characterized in that: include: A cover body, a first sealing member, and a second sealing plate, wherein the cover body and the second sealing plate are stacked, and the second sealing plate covers at least 80% of the area of ​​the cover body when perpendicularly projected onto the cover body. The cover body is provided with a pole through-hole for receiving a pole, and the second sealing plate is provided with a second through-hole, and the pole through-hole and the second through-hole are located opposite each other. The second sealing plate is arranged around the first sealing member, the first sealing member is inserted into the pole through hole, and the upper surface of the second sealing plate is in contact with the lower surface of the cover plate body.

2. The battery cover according to claim 1, characterized in that: The first sealing member and the second sealing plate are integrally provided.

3. The battery cover according to claim 1, characterized in that: The first sealing member and the second sealing plate are provided separately.

4. The battery cover according to claim 1, characterized in that: The first sealing member includes a first circular ring and a second circular ring that are connected to each other and pass through each other. The first circular ring is located in the pole through hole, and the second circular ring is connected to the second sealing plate. The outer diameter a of the first circular ring and the outer diameter b of the second circular ring satisfy: a<b.

5. The battery cover according to claim 4, characterized in that: A first groove is provided on a side of the cover plate body facing the second sealing plate, and the second ring is embedded in the first groove; Alternatively, a second groove is provided on a side of the second sealing plate facing the cover plate body, and the second ring is embedded in the second groove.

6. The battery cover according to claim 1, characterized in that: The first seal includes a second sub-seal and a convex ring. The convex ring is fixedly connected to the side of the second sealing plate facing the cover plate body. The convex ring is connected to the second through hole. The convex ring is inserted into the pole through hole. The second sub-seal is arranged on the inner wall of the convex ring.

7. The battery cover according to claim 6, characterized in that: The first seal further includes a third sub-seal, and the third sub-seal is located between the inner wall of the pole through hole and the outer wall of the protruding ring.

8. The battery cover according to claim 2, characterized in that: The first sealing member and the second sealing plate are made of the same material, and are fixedly connected to each other by hot melting or bonding.

9. The battery cover according to claim 2, characterized in that: The first sealing member and the second sealing plate are made of different materials, and the first sealing member and the second sealing plate are fixedly connected by hot melting or adhesive bonding.

10. The battery cover according to claim 2, characterized in that: The first sealing member and the second sealing plate are made of the same material, and the first sealing member and the second sealing plate are an integrally formed structure.

11. A battery, characterized in that: The battery cover comprises a housing, a battery cell, and the battery cover according to any one of claims 1 to 10, wherein the battery cover and the housing are combined to form a receiving cavity, the battery cell is arranged in the receiving cavity, and the second sealing plate is located between the battery cell and the cover body; The battery cell includes a pole, which is inserted into the pole through-hole and the second through-hole. At least part of the first seal is located between the outer wall of the pole and the inner wall of the pole through-hole. The first seal is used to seal the gap between the pole and the cover body.

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