Insulating spacer for lithium battery cover plate
By designing an insulating gasket on the lithium battery cover and combining an insulating layer, a flame retardant layer and a graphene layer, the problem of poor thermal insulation of lithium battery foam is solved, flame retardancy, insulation and efficient heat dissipation are achieved, and the safety and life of the battery are improved.
Patent Information
- Application Number
- CN202422332719.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The foam materials in existing lithium batteries have poor thermal insulation effects and are unable to effectively block heat when the battery cell experiences thermal runaway, resulting in insufficient safety.
An insulating gasket is used, including an insulating layer, a flame retardant layer and a graphene layer. The insulating layer is made of thermoplastic resin, the flame retardant layer uses nano-magnesium hydroxide flame retardant, and the graphene layer is graphene aerogel. Combined with the glue layer, it achieves tight bonding and provides insulation, flame retardancy and efficient heat dissipation functions.
It achieves a flame retardant effect when the battery cell is under thermal runaway, delays combustion, improves safety, and provides sufficient breathing space and heat dissipation effect through the high elasticity and high heat dissipation capacity of the graphene layer, thereby extending the life of the battery cell.
Smart Images
Figure CN223487294U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to an insulating gasket for a lithium battery cover. Background Technology
[0002] Lithium-ion batteries are a type of rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Lithium-ion batteries are characterized by high energy density, high output voltage, low self-discharge, excellent cycle performance, and high charging efficiency. They are a pollution-free, green battery. Insulating pads are used in the production process of lithium-ion batteries. The main function of the insulating pads is to prevent short circuits between the positive and negative electrodes of the battery, making them an important component of the battery cell.
[0003] Currently, foam-like materials are often used to separate each cell module in power battery modules or battery packs. Double-sided adhesive is attached to both sides of the foam, and it is attached between two cell modules during use. Because foam has good compressibility and resilience, as well as insulation, it can provide breathing space for the cell during charging and discharging and absorb the expansion of the cell. However, the heat insulation effect of foam is not good enough. When the cell experiences thermal runaway, it is difficult to play an effective role in heat insulation. Utility Model Content
[0004] The main purpose of this utility model is to provide an insulating gasket for lithium battery cover plates to solve the above-mentioned technical problems and achieve flame retardant, insulation and heat dissipation effects.
[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0006] An insulating gasket for a lithium battery cover includes an insulating gasket and a battery casing. The insulating gasket is installed in the battery casing, which includes a housing and an end cap. The end cap is installed on the upper surface of the housing, and the insulating gasket is installed on the end cap and the bottom of the housing. The insulating gasket includes an insulating layer, a flame-retardant layer, a graphene layer, a first adhesive layer, and a second adhesive layer. The insulating layer is bonded to the lower end of the flame-retardant layer and the upper end of the graphene layer through the first adhesive layer, and the upper end of the flame-retardant layer is bonded to the lower end of the graphene layer through the second adhesive layer.
[0007] As a preferred technical solution, the end cap is provided with a mounting groove for placing an insulating pad.
[0008] As a preferred technical solution, the battery casing further includes a cover plate, which is installed on the upper end of the end cap.
[0009] As a preferred technical solution, the opening of the placement groove is provided with a step, and the cover plate abuts against the step.
[0010] As a preferred technical solution, the end cap, the insulating gasket, and the cover plate are provided with through holes.
[0011] As a preferred technical solution, the inner surface of the end cap is provided with an internal thread, and the outer surface of the housing is provided with an external thread, wherein the internal thread and the external thread are matched and connected.
[0012] As a preferred technical solution, the inner surface of the end cap is further provided with a protrusion, the protrusion being disposed at the end of the internal thread, and the housing is provided with a groove, the groove being disposed at the end of the external thread, and the protrusion being engaged in the groove.
[0013] As a preferred technical solution, the housing is further provided with a boss, which is arranged around the outer surface of the housing and abuts against the lower end of the end cap.
[0014] The beneficial effects of this utility model are as follows: The insulating gasket for the lithium battery cover plate has an insulating layer, a flame-retardant layer, and a graphene layer. The insulating layer is made of thermoplastic resin and has excellent properties such as anti-aging, chemical resistance, weather resistance, and ultraviolet radiation resistance. The flame-retardant layer uses environmentally friendly flame-retardant materials, specifically nano-level magnesium hydroxide flame retardant, to achieve a flame-retardant effect. After thermal runaway of the battery cell, it can delay combustion and improve safety. The graphene layer is a graphene aerogel layer. Graphene aerogel has high elasticity and high heat dissipation capacity. It can shrink along its own thickness direction, providing sufficient breathing space for the battery cell module during charging and discharging, and providing good heat dissipation for the battery cell module, preventing the battery cell module from working at high temperatures and extending the battery cell's lifespan. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the insulating gasket for the lithium battery cover plate according to this utility model;
[0016] Figure 2 This is a cross-sectional view of the end cap involved in this utility model;
[0017] Figure 3 This is a cross-sectional view of the insulating gasket involved in this utility model;
[0018] Figure 4 This is a schematic diagram of the structure of the shell involved in this utility model. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0020] Please combine Figure 1 , Figure 2 and Figure 3 As shown, an insulating gasket for a lithium battery cover includes an insulating gasket 2 and a battery casing 1. The insulating gasket 2 is installed in the battery casing 1. The battery casing 1 includes a housing 11, an end cap 12, and a cover plate 13. The end cap 12 is installed on the upper surface of the housing 11, and the cover plate 13 is installed on the upper end face of the end cap 12. The insulating gasket 2 is installed at the bottom of the end cap 12 and the housing 11. The battery cell is assembled in the battery casing 1, thereby protecting the positive and negative terminals of the battery cell. In particular, the end cap 12 is installed in the battery casing 1. The cover 12 is provided with a mounting groove 121 for placing the insulating gasket 2. The shape of the mounting groove 121 matches the shape of the insulating gasket 2, so that the insulating gasket 2 can be tightly placed in the mounting groove 121. The insulating gasket 2 includes a first insulating layer 21, a flame-retardant layer 23, a graphene layer 25, a second insulating layer 26, a first adhesive layer 22, and a second adhesive layer 24. The first insulating layer 21 is bonded to the lower end of the flame-retardant layer 23 by the first adhesive layer 22, and the second insulating layer 26 is bonded to the lower end of the flame-retardant layer 23 by the first adhesive layer 25. The first adhesive layer 22 is bonded to the upper end of the graphene layer 25. The upper end of the flame-retardant layer 23 is bonded to the lower end of the graphene layer 25 through the second adhesive layer 24. The first insulating layer 21 and the second insulating layer 26 are made of thermoplastic resin and have excellent properties such as anti-aging, chemical resistance, weather resistance, and ultraviolet radiation resistance. The first adhesive layer 22 is acrylic ceramic thermally conductive adhesive, and the second adhesive layer 24 is flame-retardant PET double-sided adhesive. The flame-retardant layer 23 uses environmentally friendly flame-retardant materials, specifically using nano-level magnesium hydroxide flame retardant, thereby achieving a flame-retardant effect. After thermal runaway of the battery cell, it can delay combustion and improve safety. The graphene layer 25 is a graphene aerogel layer. Graphene aerogel has high elasticity and high heat dissipation capacity. It can shrink along its own thickness direction, providing sufficient breathing space for the battery cell module during charging and discharging, and providing good heat dissipation for the battery cell module, preventing the battery cell module from working at high temperatures and extending the battery cell's lifespan.
[0021] Please continue to combine Figure 1 , Figure 2 and Figure 4As shown, specifically, a step 124 is provided at the opening of the mounting groove 121, and the cover plate 13 abuts against the step 124. The cover plate 13 is fixed to the end cover 12 by riveting, thereby preventing the cover plate 13 from loosening and separating from the end cover 12. The end cover 12, the insulating gasket 2, and the cover plate 13 are provided with through holes 3, which allow the positive electrode of the power core to extend out. The inner surface of the end cover 12 is provided with an internal thread 122, and the outer surface of the housing 11 is provided with an external thread 111. The internal thread 122 and the external thread 111 are matched and connected, thereby threading the end cover 12 to the housing 11 to fix the end cover 12 to the housing 11. As a preferred technical solution in this embodiment, a protrusion 123 is further provided on the inner surface of the end cap 12. The protrusion 123 is located at the end of the internal thread 122. A groove 112 is provided on the housing 11, located at the end of the external thread 111. When the end cap 12 is threadedly connected to the housing 11, the protrusion 123 is engaged in the groove 112, thereby preventing the end cap 12 from separating from the housing 11. A boss 113 is also provided on the housing 11. The boss 113 is circumferentially disposed on the outer surface of the housing 11 and abuts against the lower end of the end cap 12, thereby limiting the installation depth of the end cap 12 to ensure that the protrusion 123 can be accurately engaged in the groove 112.
[0022] The embodiments described above are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model should be included within the scope of this utility model patent application.
Claims
1. An insulating gasket for a lithium battery cover, comprising an insulating gasket and a battery casing, wherein the insulating gasket is installed in the battery casing, characterized in that, The battery casing includes a housing and an end cap. The end cap is mounted on the upper surface of the housing. An insulating gasket is mounted on the end cap and the bottom of the housing. The insulating gasket includes an insulating layer, a flame-retardant layer, a graphene layer, a first adhesive layer, and a second adhesive layer. The insulating layer is bonded to the lower end of the flame-retardant layer and the upper end of the graphene layer through the first adhesive layer. The upper end of the flame-retardant layer is bonded to the lower end of the graphene layer through the second adhesive layer.
2. The insulating gasket for a lithium battery cover according to claim 1, characterized in that, The end cap is provided with a mounting groove for placing an insulating pad.
3. The insulating gasket for a lithium battery cover plate according to claim 2, characterized in that, The battery casing also includes a cover plate, which is installed on the upper end of the end cap.
4. The insulating gasket for a lithium battery cover according to claim 3, characterized in that, The opening of the placement groove is provided with a step, and the cover plate abuts against the step.
5. The insulating gasket for a lithium battery cover according to claim 4, characterized in that, The end cap, the insulating gasket, and the cover plate are provided with through holes.
6. The insulating gasket for a lithium battery cover according to claim 1, characterized in that, The inner surface of the end cap is provided with an internal thread, and the outer surface of the housing is provided with an external thread, wherein the internal thread and the external thread are matched and connected.
7. The insulating gasket for a lithium battery cover according to claim 6, characterized in that, The inner surface of the end cap is also provided with a protrusion, which is located at the end of the internal thread. The housing is provided with a groove, which is located at the end of the external thread. The protrusion is engaged in the groove.
8. The insulating gasket for a lithium battery cover according to claim 7, characterized in that, The housing is also provided with a boss, which is arranged around the outer surface of the housing and abuts against the lower end of the end cap.