High-temperature-resistant lithium ion battery and production process thereof
By adopting the design of a three -layer diaphragm, cellulose diaphragm and optimizing the positive and negative forms, the problem of decreased performance of traditional lithium -ion batteries at high temperature and shortening life span, realized the good adaptability and long cycle life of high temperature environments, Essence
Patent Information
- Application Number
- CN202411567302.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-01-28
AI Technical Summary
Traditional lithium-ion batteries have deteriorated performance and shortened cycle life under high temperature environments, and the diaphragm may soften, deform and cause short circuits at high temperatures, affecting the safety and cycle stability of the battery.
Adopt a three -layer diaphragm and cellulose diaphragm, and the carbon black conductors, carbon nanotubes and specific adhesives are added to the formula of positive and negative electrodes to optimize the design of aluminum shells and plugs, and improve the production process to improve the adaptation of batteries at high temperature. Sexual and stability.
In a high temperature of 90 degrees, lithium -ion batteries can maintain a performance of more than 80%of 5C/1C cycle of 200%to ensure good adaptability and cycle stability under different temperature conditions.
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of lithium ion batteries, and more specifically, to a high temperature resistant lithium ion battery and a production process thereof. Background Art
[0002] With the rapid development of science and technology, lithium-ion batteries, as key components for energy storage and conversion, have been widely used in electric vehicles, portable electronic devices, energy storage systems, etc. However, traditional lithium-ion batteries have problems such as performance degradation and shortened cycle life in high-temperature environments, which limits their application in certain specific environments, such as high-temperature working environments or occasions that require long-term high-temperature storage.
[0003] At present, most lithium-ion batteries on the market use single-layer or multi-layer polypropylene, polyethylene and other materials as separators. These separators may soften and deform at high temperatures, causing internal short circuits in the battery, which in turn affects the safety and cycle stability of the battery. In addition, the formulation of the positive and negative electrodes also directly affects the performance of the battery, especially the cycle stability at high temperatures. Traditional conductive agents and binders may lose their activity or decompose at high temperatures, resulting in reduced battery performance.
[0004] Therefore, it is particularly important to develop a lithium-ion battery that can maintain high performance and long cycle life in a high temperature environment. By optimizing the formulation of the diaphragm material, the positive and negative electrodes, and improving the production process, the adaptability and stability of lithium-ion batteries in a high temperature environment can be significantly improved, thereby broadening its application range. Summary of the invention
[0005] In view of the deficiencies in the prior art, the present invention aims to provide a high temperature resistant lithium ion battery and a production process thereof.
[0006] To achieve the above object, the present invention provides the following technical solutions: A high temperature resistant lithium ion battery, comprising an aluminum shell, a diaphragm, a positive electrode, a negative electrode, a guide pin and a rubber plug; The diaphragm uses a three-layer diaphragm and a cellulose diaphragm; The formula of the positive electrode is active material, carbon black conductive agent, carbon nanotubes and binder, and the weight ratio is 90~98:0~4:0~3:1~3; The formula of the negative electrode is active material, carbon black conductive agent, carbon nanotubes, and binder, and the weight ratio is 90~98:0~4:0~3:1~4.
[0007] Furthermore, the outer diameter of the aluminum shell is 3.8~4.0 mm, and the wall thickness is 0.1~0.2 mm.
[0008] Furthermore, the thickness of the diaphragm is 10~25um, and the three-layer diaphragm is a PP-PE-ceramic diaphragm.
[0009] Furthermore, the active material of the positive electrode uses one or more of lithium cobalt oxide, ternary lithium, lithium manganese oxide, and lithium iron phosphate. The length of the positive electrode plate is 15~50mm and the thickness is 50~150um.
[0010] Furthermore, the active material of the positive electrode uses lithium titanate, and the length of the negative electrode is 15~60mm and the thickness is 50~150um.
[0011] Furthermore, the diameter of the rubber plug is 3.3-3.8 mm, the height is 1.6-2.6 mm, the hole spacing is 1.4-1.8 mm, the hole diameter is 0.7-1.0 mm, and the rubber plug is made of butyl rubber or EPDM rubber.
[0012] Furthermore, a production process of a high temperature resistant lithium ion battery comprises the following steps: Active material, carbon black conductive agent, carbon nanotubes and binder are selected as the positive electrode formula according to a weight ratio of 90~98:0~4:0~3:1~3, and active material, carbon black conductive agent, carbon nanotubes and binder are selected as the negative electrode formula according to a weight ratio of 90~98:0~4:0~3:1~4. Positive electrode sheet, negative electrode sheet, diaphragm width, aluminum shell, rubber plug and high-temperature electrolyte are selected to make a battery. The positive electrode sheet width is 11mm, the negative electrode sheet width is 11.5mm, the diaphragm width is 12.5mm, and the aluminum shell is φ3.9*15mm. After the production is completed, a high-temperature resistant lithium-ion battery is obtained.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The high temperature resistant lithium ion battery manufactured by the present invention maintains more than 80% after 200 cycles of 5C / 1C under a high temperature environment of 90 degrees, and maintains more than 80% after 200 cycles of 5C / 1C under the conditions of normal temperature charging / high temperature 90 degrees discharging, thereby ensuring the good adaptability and cycle stability of the high temperature resistant lithium ion battery under different temperature conditions. DETAILED DESCRIPTION
[0014] Embodiment 1, a high temperature resistant lithium ion battery, characterized in that it includes an aluminum shell, a diaphragm, a positive electrode, a negative electrode, a guide pin, and a rubber plug. The diaphragm uses a three-layer diaphragm and a cellulose diaphragm. The formula of the positive electrode is an active substance and a binder, and the weight ratio is 90:1. The formula of the negative electrode is an active substance and a binder, and the weight ratio is 90:1. The outer diameter of the aluminum shell is 3.8mm and the wall thickness is 0.1mm. The thickness of the diaphragm is 10um, and the three-layer diaphragm is a PP-PE-ceramic diaphragm. The active material of the positive electrode uses lithium cobalt oxide, and the length of the positive electrode pole piece is 15mm and the thickness is 50um. The active material of the positive electrode uses lithium titanate, and the length of the negative electrode pole piece is 15mm and the thickness is 50um. The diameter of the rubber plug is 3.3mm, the height is 1.6mm, the hole spacing is 1.4mm, the pore diameter is 0.7mm, and the rubber plug is made of butyl rubber.
[0015] Embodiment 2, a high temperature resistant lithium ion battery, including an aluminum shell, a diaphragm, a positive electrode, a negative electrode, a guide pin, and a rubber plug. The diaphragm uses a three-layer diaphragm and a cellulose diaphragm. The formula of the positive electrode is an active substance, a carbon black conductive agent, a carbon nanotube, and a binder, and the weight ratio is 98:4:3:3. The formula of the negative electrode is an active substance, a carbon black conductive agent, a carbon nanotube, and a binder, and the weight ratio is 98:4:3:4. The outer diameter of the aluminum shell is 4.0mm and the wall thickness is 0.2mm. The thickness of the diaphragm is 25um, and the three-layer diaphragm is a PP-PE-ceramic diaphragm. The active material of the positive electrode uses ternary, and the length of the positive electrode pole piece is 50mm and the thickness is 150um. The active material of the positive electrode uses lithium titanate, and the length of the negative electrode pole piece is 60mm and the thickness is 150um. The diameter of the rubber plug is 3.8mm, the height is 2.6mm, the hole spacing is 1.8mm, the hole diameter is 1.0mm, and the rubber plug material is EPDM rubber.
[0016] Example 3, positive electrode formula: 96.5% lithium cobalt oxide, 1% SP, 1% carbon nanotubes, 1.5% PVDF, negative electrode formula: 95% lithium titanate, 1% SP, 1% carbon nanotubes, 3% PVDF. The width of the positive electrode sheet is 11mm, the width of the negative electrode sheet is 11.5mm, the width of the diaphragm is 12.5mm, the aluminum shell is φ3.9*15mm, the EPDM rubber plug, the high-temperature electrolyte, the 04150-5mAh battery is made, and the 5C / 1C cycle is measured at a high temperature of 90 degrees and maintained at more than 80% for 200 times, and the 5C / 1C cycle is measured at room temperature and high temperature of 90 degrees. 200 times to maintain more than 80%.
[0017] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
[0018] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A high temperature resistant lithium ion battery, characterized in that: Including aluminum shell, diaphragm, positive electrode, negative electrode, guide needle and rubber plug; The diaphragm uses a three-layer diaphragm and a cellulose diaphragm; The formula of the positive electrode is active material, carbon black conductive agent, carbon nanotubes, and binder, and the weight ratio is 90~98:0~4:0~3:1~3; The formula of the negative electrode is active material, carbon black conductive agent, carbon nanotubes, and binder, and the weight ratio is 90~98:0~4:0~3:1~4.
2. A high temperature resistant lithium ion battery according to claim 1, characterized in that: The outer diameter of the aluminum shell is 3.8~4.0mm and the wall thickness is 0.1~0.2mm.
3. A high temperature resistant lithium ion battery according to claim 1, characterized in that: The thickness of the diaphragm is 10~25um, and the three-layer diaphragm is PP-PE-ceramic diaphragm.
4. A high temperature resistant lithium ion battery according to claim 1, characterized in that: The active material of the positive electrode uses one or more of lithium cobalt oxide, ternary lithium, lithium manganese oxide, and lithium iron phosphate. The length of the positive electrode plate is 15~50mm and the thickness is 50~150um.
5. A high temperature resistant lithium ion battery according to claim 1, characterized in that: The active material of the positive electrode is lithium titanate, and the length of the negative electrode is 15~60mm and the thickness is 50~150um.
6. A high temperature resistant lithium ion battery according to claim 1, characterized in that: The diameter of the rubber plug is 3.3~3.8mm, the height is 1.6~2.6mm, the hole spacing is 1.4~1.8mm, the hole diameter is 0.7~1.0mm, and the rubber plug is made of butyl rubber or EPDM rubber.
7. A production process for a high temperature resistant lithium ion battery, applied to a high temperature resistant lithium ion battery according to any one of claims 1 to 6, characterized in that: The steps include: Active material, carbon black conductive agent, carbon nanotubes and binder are selected as the positive electrode formula according to a weight ratio of 90~98:0~4:0~3:1~3, and active material, carbon black conductive agent, carbon nanotubes and binder are selected as the negative electrode formula according to a weight ratio of 90~98:0~4:0~3:1~4. Positive electrode sheet, negative electrode sheet, diaphragm width, aluminum shell, rubber plug and high-temperature electrolyte are selected to make a battery. The positive electrode sheet width is 11mm, the negative electrode sheet width is 11.5mm, the diaphragm width is 12.5mm, and the aluminum shell is φ3.9*15mm. After the production is completed, a high-temperature resistant lithium-ion battery is obtained.