Secondary battery

A secondary battery and current collector foil technology, applied in secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve the problems of shortened driving distance, reduced capacity of lithium-ion secondary batteries, and inability to exert full output, etc., to achieve Effect of high output performance and maintaining capacity

Inactive Publication Date: 2014-06-18
MITSUBISHI MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, even if such a lithium-ion secondary battery is installed in an electric vehicle, there is a possibility that it may not be able to exert sufficient output when high output such as a fully open acc

Method used

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Example

[0040] (First embodiment)

[0041] use figure 1 with figure 2 The first embodiment of the present invention will be described. figure 1 Is a perspective view showing the secondary battery (lithium ion secondary battery) according to the present embodiment, figure 2 Middle (1) shows the edge figure 1 A-A′ line cross-sectional view, figure 2 Middle (2) shows the edge figure 1 A cross-sectional view of the line B-B'.

[0042] The secondary battery 1 of the present invention is mounted in, for example, an electric vehicle. The secondary battery 1 includes a case 11 having a substantially rectangular parallelepiped shape and a cover 12 arranged at an opening of the case 11 to seal the case 11. Such as figure 2 As shown, the case 11 accommodates the electrode body 13. In addition, the electrolyte 14 is injected into the casing 11, and the electrode body 13 is immersed in the electrolyte 14. The electrode body 13 is formed by stacking a positive electrode plate and a negative electr...

Example

[0068] (Second embodiment)

[0069] In the above-mentioned first embodiment, the positive electrode collector foil 24 and the second positive electrode layer 32 are electrically connected through the second positive electrode portion 34, but in this embodiment, as Figure 5 As shown, the difference is that the positive electrode current collector foil 24A and the second positive electrode layer 32A are electrically connected through the conductive member 35A. In addition, in this embodiment, for convenience of description, the current collector foil and the positive electrode active material layer on the separator side are omitted.

[0070] In this embodiment, the through hole 33A is formed in the first positive electrode layer 31A, and the inside of the through hole 33A is buried by the conductive member 35A. Therefore, in this embodiment, the second positive electrode layer 32A and the positive electrode current collector foil 24A are connected by the conductive member 35A. The...

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Abstract

The invention provides a secondary battery which has a performance of high output during the maintaining of a capacity. The secondary battery of the embodiment of the invention comprises an electrode body. The electrode body is provided with current collection foil and an active material layer formed at least one surface of the current collection foil. Metal ions of metal contained in the active material layer serve as movable ions, wherein the active material layer forms at least two layers, and comprises a first active material layer formed on the current collection foil, and a second active material layer formed on the first active material layer. The first active material layer is provided with a through hole exposed out of the current collection foil. The capacity of the first active material layer is larger than the capacity of the second active material layer. The output of the second active material layer is higher than the output of the first active material layer. The electrical connection with the current collection foil is achieved through the through hole.

Description

technical field [0001] The present invention relates to a secondary battery. Background technique [0002] Conventionally, secondary batteries such as lithium-ion secondary batteries have been used as batteries for driving engines mounted in electric vehicles such as electric vehicles and plug-in hybrid electric vehicles. Lithium ion secondary batteries move between electrodes as mobile ions during charge and discharge, and since no chemical reaction occurs during charge and discharge, the concentration of the electrolyte does not change. Such a lithium ion secondary battery in which metal ions move as mobile ions in the electrolytic solution during charging is called a rocking chair type secondary battery. [0003] However, in order to increase the good output characteristics of the secondary battery mounted in the electric vehicle to meet the high current output for climbing, accelerating and driving the vehicle at low temperature, or to meet the good input characteristic...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M10/04
CPCH01M4/13H01M4/366H01M4/64H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 田川嘉夫北田耕嗣
Owner MITSUBISHI MOTORS CORP
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