Secondary battery

A secondary battery and current collector foil technology, which is applied in the direction of secondary batteries, batteries, 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 high output performance Effect

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 accelerato

Method used

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no. 1 example

[0040] use figure 1 and figure 2 A first embodiment of the present invention will be described. figure 1 is a perspective view showing a secondary battery (lithium ion secondary battery) according to the present embodiment; figure 2 (1) is shown along the figure 1 A cross-sectional view of the A-A' line, (2) is shown along the figure 1 Cutaway view of line BB'.

[0041] The secondary battery 1 of the present invention is mounted in, for example, an electric vehicle. The secondary battery 1 includes a substantially rectangular parallelepiped case 11 and a cover portion 12 disposed in an opening portion of the case 11 for sealing the case 11 . like figure 2 As shown, the housing 11 accommodates the electrode body 13 . In addition, an electrolytic solution 14 is injected into the casing 11 , and the electrode body 13 is immersed in the electrolytic solution 14 . The electrode body 13 is formed by laminating and winding a positive electrode plate and a negative electrod...

no. 2 example

[0068] In the above-mentioned first embodiment, the current collector foil 33 and the second positive electrode layer 32 are electrically connected by cutting out the protruding portion 34, but in this embodiment, as Figure 4 As shown, the difference is that the current collector foil 33A and the second positive electrode layer 32A are electrically connected by 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 side of the separator are omitted.

[0069] In this embodiment, after the first positive electrode layer 31A and the second positive electrode layer 32A are formed on the current collector foil 33A, the rod-shaped conductive member 35A is inserted from the surface side of the second positive electrode layer 32A. The conductive member 35A is a rod-shaped member longer than the thickness of the first positive electrode layer 31A. For the conductive m...

no. 3 example

[0073] In the above-mentioned second embodiment, the rod-shaped conductive member 35A is inserted from the surface side of the second positive electrode layer 32A to form a conductive path through the conductive member 35A, but in this embodiment, as Figure 5 As shown, the difference from the second embodiment is that a rod-shaped conductive member 35B is inserted from the current collector foil 33B side to form a conductive path through the conductive member 35B. In this embodiment, for convenience of description, the current collector foil and positive electrode active material layer on the side of the separator are omitted.

[0074] like Figure 5 As shown in (1), in this embodiment, after the first positive electrode layer 31B and the second positive electrode layer 32B are formed on the current collector foil 33B, the rod-shaped conductive member 35B is inserted through the opening 36B formed on the current collector foil 33B. . The conductive member 35B is the same as...

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Abstract

The invention provides a secondary battery which can maintain capacity and has a high output performance. The secondary battery comprises an electrode body. The electrode body comprises a collector foil and an active material layer formed on the collector foil. Metal irons of metal contained in the active material layer are employed as movable irons. The active material layer at least is composed of two layers. A first active material layer (a first positive electrode layer) at one side of the collector foil has high capacity compared with a second active material layer (a second positive electrode layer) at the other side. The second active material layer has high output compared with the first active material layer and is connected with the collector foil through a scooping projection part as a conductive part.

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): H01M10/0525H01M4/13H01M4/36
CPCY02E60/122H01M4/13H01M4/366H01M10/0525Y02E60/10H01M4/661H01M4/70H01M2220/20
Inventor 北田耕嗣田川嘉夫
Owner MITSUBISHI MOTORS CORP
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