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Secondary battery, battery pack, and vehicle

A technology for secondary batteries and battery packs, applied in secondary batteries, battery/battery traction, secondary battery repair/maintenance, etc., can solve the problem of high energy density of batteries

Active Publication Date: 2018-03-23
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the current situation is that it is difficult to increase the energy density of batteries, and there are no aqueous solution-based secondary batteries that have an energy density exceeding the energy density of lead storage batteries and nickel-metal hydride secondary batteries.

Method used

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  • Secondary battery, battery pack, and vehicle
  • Secondary battery, battery pack, and vehicle
  • Secondary battery, battery pack, and vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0024] According to the first embodiment, a secondary battery is provided. This secondary battery includes a positive electrode, a negative electrode, and an electrolyte containing a solvent containing water and lithium ions. The negative electrode includes a negative electrode current collector containing aluminum and a coating layer containing boehmite provided on at least a part of the surface of the negative electrode current collector. The thickness of the covering layer is not less than 10 nm and not more than 1000 nm.

[0025] When a coating layer containing boehmite is provided on at least a part of the surface of the current collector, the hydrogen overvoltage can be increased compared to the case where such a coating layer is not provided. The reason is not clear, but the inventors of the present invention think as follows. Boehmite has a structure in which the structure of its surface is terminated with hydroxyl groups. It is considered that when hydrogen is gene...

no. 2 Embodiment approach

[0115] According to a second embodiment, a battery pack is provided. This battery pack includes the secondary battery of the first embodiment.

[0116] The battery pack may include one or more secondary batteries (unit cells) of the first embodiment described above. A plurality of secondary batteries that may be included in the battery pack may be electrically connected in series, in parallel, or a combination of series and parallel.

[0117] The battery pack may further include a protection circuit. The protection circuit is a circuit that controls charge and discharge of the secondary battery. Alternatively, a circuit included in a device using a battery pack as a power source (for example, electronic equipment, an automobile, etc.) may be used as a protection circuit for the battery pack.

[0118] In addition, the battery pack may further include external terminals for energization. The external terminal for energization is a terminal for outputting electric current fro...

no. 3 Embodiment approach

[0132] According to a third embodiment, a vehicle is provided. This vehicle includes the battery pack of the second embodiment.

[0133] Examples of vehicles include two- to four-wheeled hybrid electric vehicles, two- to four-wheeled electric vehicles, and assist bicycles and trams.

[0134] Figure 6 An example of a vehicle including the battery pack according to the second embodiment is shown in .

[0135] Figure 6 An automobile 41 shown in , is equipped with a battery pack 42 in an engine room in front of the vehicle body. The installation position of the battery pack in the car is not limited to the engine compartment. For example, the battery pack can also be mounted on the rear of the car body or under the seats.

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Abstract

The embodiments of the present invention relate to a secondary battery, a battery pack, and a vehicle. The present invention provides a secondary battery capable of achieving excellent cycle life performance, a battery pack including the secondary battery, and a vehicle including the battery pack. According to one embodiment, a secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode, and an electrolyte including a water-containing solvent and a lithium ion. The negative electrode includes an aluminum-containing negative electrode current collector and a boehmite-containing cover layer, and the boehmite-containing cover layer is provided on at least a part of a surface of the negative electrode current collector, and has a thickness of 10 nmto 1000 nm.

Description

technical field [0001] Embodiments of the present invention relate to a secondary battery, a battery pack, and a vehicle. Background technique [0002] In recent years, batteries using nonaqueous solvents such as lithium ion secondary batteries have been developed as high energy density secondary batteries. Lithium-ion secondary batteries are superior in energy density and cycle characteristics compared to lead storage batteries and nickel-metal hydride secondary batteries, and are expected to be used as power sources for large-scale power storage such as vehicle power sources such as hybrid cars and electric cars. As an electrolytic solution of a lithium ion secondary battery, nonaqueous solvents, such as ethylene carbonate, diethyl carbonate, and propylene carbonate, are used from a viewpoint of having a wide potential window, for example. Since these solvents are flammable, there is a problem in terms of safety. If the electrolytic solution described above can be replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/38B60L50/64
CPCH01M4/661H01M4/667H01M10/38H01M2300/0002H01M50/233H01M50/296H01M50/553H01M50/231B60L50/64H01M50/55H01M50/224H01M50/209H01M50/227H01M50/249H01M4/38H01M4/48B60L58/10H01M10/36H01M10/425H01M2220/20Y02E60/10Y02T10/70Y02P70/50B60L50/66H01M4/131H01M10/052H01M10/4257H01M10/056H01M4/485H01M50/20H01M50/543H01M50/509H01M2004/021H01M4/0404H01M4/0442H01M4/505H01M4/623H01M4/625H01M4/664H01M2004/027H01M2004/028
Inventor 伊势一树山下泰伸松野真辅高见则雄稻垣浩贵
Owner KK TOSHIBA
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