Battery cover plate and battery
A dual-layer insulation system with a high-temperature-resistant inner insulator and plastic outer sleeve addresses the issue of insulation loss in battery cover plates, ensuring safety by maintaining insulation at high temperatures.
Patent Information
- Application Number
- CN202421922150.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing battery cover plates have low melting point of plastic insulating parts under high temperature conditions, resulting in failure of insulation function, which can easily cause short circuits between the conductive electrode columns and the optical aluminum plates, and have poor safety.
The temperature-resistant insulating parts composed of insulated linings made of high-temperature resistant materials and insulated jackets made of plastic materials are arranged on the outside of the conductive electrode column and the insulated jacket sleeve is arranged on the outside of the inner lining to form a double-layer insulating structure to ensure that the insulation function does not fail under high temperature conditions.
Under high temperature conditions, the insulating lining can still maintain the insulation function of the conductive electrode column, avoid short circuits, and improve the safety and reliability of the battery.
Smart Images
Figure CN223109185U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery cover plate and a battery. Background Art
[0002] As an important part of a lithium battery, the structural design of the battery cover plate not only affects the basic performance of the battery, such as capacity and charge-discharge efficiency, but also is directly related to the safety and long-term reliability of the battery. The main structural components of the battery cover plate include conductive electrode posts, light aluminum plates, insulating parts, explosion-proof valves, etc.
[0003] Among them, the insulating part is used to insulate the conductive electrode posts, usually made of plastic materials, to prevent short circuits caused by contact between the insulating part and the light aluminum plate. The explosion-proof valve is used to allow the high-temperature and high-pressure gas inside the battery to break through the explosion-proof valve when thermal runaway occurs inside the battery, thereby achieving the purpose of pressure relief and protection.
[0004] However, after the battery is used in long-term cycles, before the high-temperature and high-pressure gas inside the battery breaks through the explosion-proof valve, the temperature inside the battery will gradually rise, causing the internal heat to gradually transfer to the insulating part made of plastic material. Since the melting point of the plastic material is relatively low and cannot withstand high temperatures, the insulating part will melt at high temperatures, causing the insulating part to lose its insulating function for the conductive electrode posts, exposing the conductive electrode posts, and easily causing direct contact between the conductive electrode posts and the light aluminum plate, thereby triggering a short circuit and having poor safety. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a battery cover plate and a battery, which have good insulation and high safety in a high-temperature environment.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] On the one hand, a battery cover plate is provided, and the battery cover plate includes:
[0008] Conductive electrode posts;
[0009] A temperature-resistant insulating part, the temperature-resistant insulating part includes an insulating inner lining and an insulating outer cover. The insulating inner lining is made of a high-temperature-resistant material and is sleeved outside the conductive electrode posts. The insulating outer cover is made of plastic material and is sleeved outside the insulating inner lining;
[0010] A cover plate body, a through hole is opened on the cover plate body, the conductive electrode posts are inserted into the through hole, and the side of the cover plate body facing away from the electrode group abuts against the insulating inner lining and the insulating outer cover and is used to carry the insulating inner lining and the insulating outer cover.
[0011] Optionally, the conductive electrode post includes a post body, a first limiting flange, and a second limiting flange. The first limiting flange is provided on a side of the post body facing away from the electrode group and extends in a direction away from the central axis of the post body. The second limiting flange is provided on a side of the post body close to the electrode group and extends in a direction away from the central axis of the post body. The insulating inner sleeve is sleeved on the post body, and both the insulating inner lining and the insulating outer sleeve are clamped between the first limiting flange and the cover plate body.
[0012] Optionally, a surface of the insulating inner lining facing the first limiting flange is lower than a surface of the insulating outer sleeve facing the first limiting flange, so as to form a limiting groove on the temperature-resistant insulating member. A limiting platform is formed on a side of the first limiting flange facing the second limiting flange, and the limiting platform extends in a direction close to the second limiting flange. The limiting platform is inserted into the limiting groove and abuts against the surface of the insulating inner lining facing the first limiting flange.
[0013] Optionally, the battery cover plate further includes a seal. The seal includes a seal body, and the seal body is sleeved on the post body and is clamped between the insulating inner lining and the second limiting flange.
[0014] Optionally, the seal further includes a seal flange. The seal flange is provided on a side of the seal body close to the second limiting flange and extends in a direction away from the central axis of the post body, and the seal flange is clamped between the cover plate body and the second limiting flange.
[0015] Optionally, a width dimension of the insulating outer sleeve in a first direction is B, and an overlapping width dimension of the insulating outer sleeve and the first limiting flange in the first direction is b, and b / B≥0.5 is satisfied.
[0016] Optionally, a height dimension of the insulating inner lining in a second direction is h, and a height dimension of the insulating outer sleeve in the second direction is H, and 0.3mm≤h<H is satisfied.
[0017] Optionally, the insulating outer sleeve is formed on the outside of the insulating inner lining by an injection molding process.
[0018] Optionally, the insulating inner lining is a ceramic ring.
[0019] On the other hand, a battery is further provided. The battery includes the battery cover plate as described in any one of the above, and the battery further includes the electrode group and a housing. The battery cover plate is covered on the housing to form a storage chamber for accommodating the electrode group.
[0020] Advantageous effects of the present utility model:
[0021] The present utility model provides a battery cover plate. By sleeving a temperature-resistant insulating member composed of an insulating inner lining and an insulating outer sheath on the outside of the conductive electrode post, when under high-temperature conditions, even if the insulating outer sheath made of plastic material melts, the insulating inner lining made of high-temperature-resistant material on the inner side of the insulating outer sheath can still achieve the insulating function of the conductive electrode post under high-temperature conditions, thereby avoiding the short-circuit problem caused by insulation failure under high-temperature conditions. At the same time, an insulating outer sheath made of plastic material is arranged on the outside of the insulating inner lining, thereby playing a protective role for the insulating inner lining and preventing the insulating inner lining from being damaged due to assembly or a certain external factor.
[0022] The present utility model also provides a battery. By applying the above-mentioned battery cover plate, even under high-temperature conditions, the insulating performance of the conductive electrode post can still be ensured, thereby improving the safety of the battery during use. Brief Description of the Drawings
[0023] Figure 1 is the structural exploded view of the battery cover plate provided by the present utility model;
[0024] Figure 2 is the partial structural cross-sectional view of the battery cover plate provided by the present utility model;
[0025] Figure 3 is Figure 2 the enlarged structural view of part A in
[0026] Figure 4 is the structural schematic diagram of the conductive electrode post in the battery cover plate provided by the present utility model;
[0027] Figure 5 is the structural schematic diagram of the seal in the battery cover plate provided by the present utility model.
[0028] In the figure:
[0029] 1. Conductive electrode post; 11. Post main body; 12. First limiting flange; 13. Second limiting flange; 14. Limiting platform;
[0030] 2. Temperature-resistant insulating member; 21. Insulating inner lining; 22. Insulating outer sheath;
[0031] 3. Cover plate main body;
[0032] 4. Seal; 41. Seal main body; 42. Seal flange. Detailed Description of the Embodiment
[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.
[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the upper surface of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "on the lower surface of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.
[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.
[0037] As an important part of a lithium battery, the structural design of the battery cover not only affects the basic performance of the battery, such as capacity and charge-discharge efficiency, but also is directly related to the safety and long-term reliability of the battery. The main structural components of the battery cover include conductive electrode posts, light aluminum plates, insulating parts, explosion-proof valves, etc.
[0038] Among them, the insulating part is used to insulate the conductive electrode posts. Usually, plastic materials are used to prevent short circuits caused by the contact between the insulating part and the light aluminum plate. The explosion-proof valve is used to allow the high-temperature and high-pressure gas inside the battery to break through the explosion-proof valve when thermal runaway occurs inside the battery, thereby achieving the purpose of pressure relief and protection.
[0039] However, after the battery is used in long-term cycling, before the high-temperature and high-pressure gas inside it breaks through the explosion-proof valve, the temperature inside the battery will gradually rise, causing the internal heat to gradually transfer to the insulating part made of plastic material. Since the melting point of the plastic material is relatively low and cannot withstand high temperatures, the insulating part will melt at high temperatures, causing the insulating part to lose its insulating function for the conductive electrode post, exposing the conductive electrode post, which easily causes the conductive electrode post to come into direct contact with the light aluminum plate, thus triggering a short circuit and having poor safety.
[0040] Therefore, in order to avoid insulation failure and short-circuit problems caused by the melting of the insulating part under high-temperature conditions, this embodiment provides a battery cover plate.
[0041] As Figures 1 to 5 shown, the battery cover plate includes a conductive electrode post 1, a heat-resistant insulating part 2, and a cover plate body 3. The heat-resistant insulating part 2 includes an insulating inner lining 21 and an insulating outer sleeve 22. The insulating inner lining 21 is made of high-temperature-resistant material and is sleeved outside the conductive electrode post 1. The insulating outer sleeve 22 is made of plastic material and is sleeved outside the insulating inner lining 21. A through hole is provided on the cover plate body 3, and the conductive electrode post 1 is inserted into the through hole. The side of the cover plate body 3 facing away from the electrode group abuts against the insulating inner lining 21 and the insulating outer sleeve 22 and is used to carry the insulating inner lining 21 and the insulating outer sleeve 22.
[0042] By sleeving a heat-resistant insulating part 2 composed of an insulating inner lining 21 and an insulating outer sleeve 22 outside the conductive electrode post 1, when in a high-temperature condition, even if the insulating outer sleeve 22 made of plastic material melts, the insulating inner lining 21 made of high-temperature-resistant material inside the insulating outer sleeve 22 can still achieve the insulating function for the conductive electrode post 1 under high-temperature conditions, thus avoiding short-circuit problems caused by insulation failure under high-temperature conditions. At the same time, an insulating outer sleeve 22 made of plastic material is arranged outside the insulating inner lining 21, thereby playing a protective role for the insulating inner lining 21 and preventing the insulating inner lining 21 from being damaged due to assembly or certain external factors.
[0043] Among them, this battery cover plate can be applied to various different types of batteries, such as cylindrical batteries, blade batteries, or square shell batteries. In this embodiment, this battery cover plate is applied to a cylindrical battery. In this embodiment, the shape of the cover plate body 3 is circular.
[0044] Optionally, as Figure 3 、 Figure 4As shown, the conductive electrode 1 includes a pole body 11, a first limiting flange 12 and a second limiting flange 13. The first limiting flange 12 is arranged on the side of the pole body 11 away from the pole group and extends in a direction away from the central axis of the pole body 11. The second limiting flange 13 is arranged on the side of the pole body 11 close to the pole group and extends in a direction away from the central axis of the pole body 11. The insulating lining 21 is sleeved on the pole body 11, and the insulating lining 21 and the insulating outer sleeve 22 are both sandwiched between the first limiting flange 12 and the cover body 3.
[0045] By respectively arranging the first limiting flange 12 and the second limiting flange 13 on both sides of the pole body 11, the first limiting flange 12 and the second limiting flange 13 are respectively located on the inner and outer sides of the cover body 3, thereby realizing the fixation between the conductive pole 1 and the cover body 3, and the heat-resistant insulating part 2 composed of the insulating lining 21 and the insulating outer jacket 22 is arranged between the first limiting flange 12 and the cover body 3, thereby realizing the fixation of the heat-resistant insulating part 2.
[0046] In this embodiment, the conductive electrode 1 is manufactured by an integrated molding process so as to simultaneously obtain the electrode body 11, the first limiting flange 12 and the second limiting flange 13. In other embodiments, a welding process may also be used to weld the first limiting flange 12 and the second limiting flange 13 to both sides of the electrode body 11.
[0047] Alternatively, if Figure 3 As shown, the surface of the insulating lining 21 facing the first limit flange 12 is lower than the surface of the insulating outer sleeve 22 facing the first limit flange 12, so as to form a limit groove on the temperature-resistant insulating part 2, and a limit platform 14 is formed on the side of the first limit flange 12 facing the second limit flange 13, and the limit platform 14 extends in a direction close to the second limit flange 13, and the limit platform 14 is inserted in the limit groove and abuts against the surface of the insulating lining 21 facing the first limit flange 12.
[0048] By making the surface of the insulating lining 21 facing the first limiting flange 12 lower than the surface of the insulating jacket 22 facing the first limiting flange 12, on the one hand, when the conductive electrode column 1 is subjected to force, the force applied to the conductive electrode column 1 can be first transmitted to the insulating jacket 22, and the insulating jacket 22 is made of plastic material, so it has a certain elasticity and can buffer the pressure, thereby protecting the insulating lining 21. On the other hand, by forming a limiting groove on the heat-resistant insulating part 2 that cooperates with the limiting platform 14, it is convenient to position the heat-resistant insulating part 2 and the conductive electrode column 1 during assembly, and the heat-resistant insulating part 2 is limited to avoid the temperature-resistant insulating part 2 from moving and affecting the insulation effect.
[0049] Alternatively, if Figure 3 , Figure 5As shown, the battery cover plate further includes a seal 4. The seal 4 includes a seal main body 41. The seal main body 41 is sleeved on the pole main body 11 and is clamped between the insulating inner lining 21 and the second limiting flange 13. By sleeving the seal main body 41 on the pole main body 11 and clamping the seal main body 41 between the insulating inner lining 21 and the second limiting flange 13, the gap between the pole main body 11 and the cover plate body 3 is filled to achieve sealing and prevent the electrolyte inside the battery from leaking. In this embodiment, the seal 4 is made of rubber material.
[0050] Optionally, as Figure 3 , Figure 5 shown, the seal 4 further includes a seal flange 42. The seal flange 42 is provided on the side of the seal main body 41 close to the second limiting flange 13 and extends in a direction away from the central axis of the pole main body 11. The seal flange 42 is clamped between the cover plate body 3 and the second limiting flange 13. By forming the seal flange 42 on the side of the seal main body 41 close to the second limiting flange 13 and extending in a direction away from the central axis of the pole main body 11, and clamping the seal flange 42 between the cover plate body 3 and the second limiting flange 13, the gap between the second limiting flange 13 and the cover plate body 3 is filled to achieve sealing, and through the mutual cooperation of the seal main body 41 and the seal flange 42, the sealing area is increased and the sealing effect is improved. In this embodiment, the seal 4 is made by an injection molding process so as to obtain the seal main body 41 and the seal flange 42 at the same time.
[0051] Optionally, as Figure 3 shown, the width dimension of the insulating jacket 22 in the first direction is B, and the overlapping width dimension of the insulating jacket 22 and the first limiting flange 12 in the first direction is b, and b / B≥0.5 is satisfied. By limiting the width dimension B of the insulating jacket 22 in the first direction and the overlapping width dimension b of the insulating jacket 22 and the first limiting flange 12 in the first direction, and making the two satisfy b / B≥0.5, it is ensured that there is a large enough overlapping area between the insulating jacket 22 and the first limiting flange 12, so as to ensure the fixing effect of the first limiting flange 12 on the insulating jacket 22.
[0052] Optionally, as Figure 3 shown, the height dimension of the insulating inner lining 21 in the second direction is h, and the height dimension of the insulating jacket 22 in the second direction is H, and 0.3mm≤h≤H is satisfied. By limiting the height dimension h of the insulating inner lining 21 in the second direction and the height dimension H of the insulating jacket 22 in the second direction, and making the two satisfy 0.3mm≤h<H, on the one hand, it is ensured that the insulating inner lining 21 has a sufficient thickness, so that it has a good insulating effect, and on the other hand, it is avoided that the height of the insulating inner lining 21 is higher than that of the insulating jacket 22, so that the insulating jacket 22 cannot protect the insulating inner lining 21.
[0053] Optionally, the insulating jacket 22 is formed on the outer side of the insulating lining 21 by an injection molding process. By forming the insulating jacket 22 on the outer side of the insulating lining 21 through the injection molding process, the insulating lining 21 and the insulating jacket 22 are formed as a whole, so that there is no need to separately assemble the insulating lining 21 and the insulating jacket 22 later, simplifying the assembly process.
[0054] Optionally, the insulating lining 21 is a ceramic ring. By using the ceramic ring as the insulating lining 21, it has good insulation and high heat resistance, so that it can still have high insulation under high temperature conditions. Among them, in addition to using the ceramic ring as the insulating lining 21, a special silicone rubber with the brand number MKC-65P can also be used to make the insulating lining 21.
[0055] In this embodiment, a battery is also provided. The battery includes the above-mentioned battery cover plate. The battery further includes a pole group and a housing. The battery cover plate is covered on the housing to form a storage chamber for accommodating the pole group. By applying the above-mentioned battery cover plate, the battery can ensure the insulation performance of the conductive electrode post 1 even under high temperature conditions, thereby improving the safety during the use of the battery.
[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. Battery cover plate, characterized in that, The battery cover plate includes: A conductive electrode post (1); A temperature-resistant insulating member (2), the temperature-resistant insulating member (2) includes an insulating inner lining (21) and an insulating outer sleeve (22), the insulating inner lining (21) is made of a high-temperature resistant material and is sleeved outside the conductive electrode post (1), and the insulating outer sleeve (22) is made of a plastic material and is sleeved outside the insulating inner lining (21); A cover plate body (3), a through hole is formed on the cover plate body (3), the conductive electrode post (1) is inserted into the through hole, and one side of the cover plate body (3) facing away from the electrode group abuts against the insulating inner lining (21) and the insulating outer sleeve (22), and is used for carrying the insulating inner lining (21) and the insulating outer sleeve (22).
2. The battery cover plate according to claim 1, characterized in that, The conductive electrode post (1) includes a post body (11), a first limiting flange (12) and a second limiting flange (13), the first limiting flange (12) is arranged on the side of the post body (11) facing away from the electrode group and extends in a direction away from the central axis of the post body (11), the second limiting flange (13) is arranged on the side of the post body (11) close to the electrode group and extends in a direction away from the central axis of the post body (11), the insulating inner lining (21) is sleeved on the post body (11), and both the insulating inner lining (21) and the insulating outer sleeve (22) are clamped between the first limiting flange (12) and the cover plate body (3).
3. The battery cover plate according to claim 2, characterized in that, The surface of the insulating inner lining (21) facing the first limiting flange (12) is lower than the surface of the insulating outer sleeve (22) facing the first limiting flange (12), so as to form a limiting groove on the temperature-resistant insulating member (2), a limiting platform (14) is formed on one side of the first limiting flange (12) facing the second limiting flange (13), the limiting platform (14) extends in a direction close to the second limiting flange (13), and the limiting platform (14) is inserted into the limiting groove and abuts against the surface of the insulating inner lining (21) facing the first limiting flange (12).
4. The battery cover plate according to claim 2, characterized in that, The battery cover plate further includes a sealing member (4), the sealing member (4) includes a sealing body (41), the sealing body (41) is sleeved on the post body (11) and is clamped between the insulating inner lining (21) and the second limiting flange (13).
5. The battery cover plate according to claim 4, characterized in that, The sealing member (4) further includes a sealing flange (42), the sealing flange (42) is arranged on the side of the sealing body (41) close to the second limiting flange (13) and extends in a direction away from the central axis of the post body (11), and the sealing flange (42) is clamped between the cover plate body (3) and the second limiting flange (13).
6. The battery cover plate according to claim 2, characterized in that, The width dimension of the insulating outer sleeve (22) in the first direction is B, and the overlapping width dimension of the insulating outer sleeve (22) and the first limiting flange (12) in the first direction is b, and it satisfies that b / B≥0.
5.
7. The battery cover plate according to claim 1, wherein, The height dimension of the insulating inner lining (21) in the second direction is h, and the height dimension of the insulating outer sheath (22) in the second direction is H, and it satisfies that 0.3 mm ≤ h < H.
8. The battery cover plate according to claim 1, characterized in that, The insulating outer sheath (22) is formed on the outer side of the insulating inner lining (21) by an injection molding process.
9. The battery cover plate according to claim 1, characterized in that, The insulating inner lining (21) is a ceramic ring.
10. A battery, characterized in that, The battery includes the battery cover plate according to any one of claims 1-9. The battery further includes the electrode group and the housing. The battery cover plate is covered on the housing to form a storage chamber for accommodating the electrode group.