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Lithium ion secondary battery

A secondary battery and lithium-ion technology, which is applied in secondary batteries, secondary battery manufacturing, battery pack components, etc., can solve the problem of difficult winding, low conduction capacity, and long pole piece of single-pole core winding structure. and other issues, to achieve the effect of expanding the heat dissipation surface area, easy preparation process, and improving rate performance

Active Publication Date: 2007-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low conductivity of conventional electrodes is one of the main reasons for the high internal resistance of lithium-ion secondary batteries.
At present, most commercial lithium-ion secondary batteries use a single tab as the current extraction method, but the current extraction and introduction are limited to a limited number of welding points, forming a bottleneck, low conduction capacity, and battery charging and discharging. The current distribution in the process is not uniform enough
[0004] In addition, most of the existing battery pole cores are single-pole cores with wound or laminated structures. However, in the field of high-capacity and high-power batteries, the winding structure of single-pole cores has disadvantages such as long pole pieces and difficult production and winding. , The actual production process of the unipolar core laminated structure is complex, the production and lamination are difficult, and the disadvantages of low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Pole core preparation:

[0047] Positive sheet preparation process: Dissolve PVDF (polyvinylidene fluoride) in NMP (N-methylpyrrolidone), and LiCoO 2 and acetylene black are added to the solution, mixed thoroughly to make a slurry, the composition of which is LiCoO 2 : Acetylene black: PVDF (polyvinylidene fluoride) = 92:4:4. This slurry was uniformly coated on a 20 μm aluminum foil, and dried at 120° C. After cutting and rolling, a positive electrode sheet with a thickness of 120 μm was obtained.

[0048] Negative sheet preparation process: Dissolve PVDF (polyvinylidene fluoride) in NMP (N-methylpyrrolidone), add artificial graphite to the solution, and mix thoroughly to form a slurry, which consists of artificial graphite: PVDF (poly vinylidene fluoride)=95:5. Furthermore, this slurry was uniformly coated on the copper foil of 20 micrometers, and it dried at 120 degreeC. After cutting and rolling, a negative electrode sheet with a thickness of 120 μm was obtai...

Embodiment 2

[0053] The battery pole core described in Example 1 and the battery assembly method similar to Example 1 are adopted, except that the top view of the outer wall of the casing is a cylindrical structure in which five hexagonal structures are arranged side by side and connected to each other as shown in FIG. 3 .

Embodiment 3

[0055] The battery pole core described in Example 1 and the battery assembly method similar to Example 1 are adopted, except that the top view of the outer wall of the housing is a cylindrical structure in which five octagonal structures arranged side by side are connected to each other as shown in FIG. 4 .

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Abstract

The Li-ion secondary cell comprises: an electrode core, the electrolyte, a metal shell, and the end cap assembly. Wherein, the metal shell contains multiple connected inner cavities every with one electrode core.

Description

【Technical field】 [0001] The invention relates to a lithium ion secondary battery, in particular to a power type lithium ion secondary battery with good heat dissipation effect, high mechanical and safety performance and excellent rate performance. 【Background technique】 [0002] With the continuous improvement of the capacity of the lithium-ion secondary battery, its specific energy is also increasing, and the heat generated during the charging and discharging process of the battery is also increasing. Therefore, considering the battery itself, it is required to be able to release The heat generated inside is dissipated. However, currently used lithium-ion secondary battery casings are generally cylindrical or square. The surface area of ​​the shell for heat dissipation is relatively small. During the charging process, especially when overcharging, the heat loss rate is much lower than the heat generation rate, which causes the internal temperature of the battery to rise s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/50H01M50/107H01M50/147H01M50/169H01M50/503H01M50/522H01M50/528H01M50/591
CPCH01M2002/0205Y02E60/122H01M10/5008H01M2/202H01M10/04H01M10/0525H01M2/0202H01M2/0434H01M2/04H01M10/5053H01M10/6554H01M10/617Y02E60/10H01M50/147Y02P70/50H01M50/591H01M50/522H01M50/169H01M50/503H01M50/107H01M10/38
Inventor 沈晞朱建华赖庆韩一力
Owner BYD CO LTD
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