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Secondary battery, battery pack, and vehicle

A technology for secondary batteries and battery packs, applied in secondary batteries, primary batteries, battery electrodes, etc., can solve the problems of difficulty in achieving low battery resistance, low ionic conductivity, and lack of high current discharge performance.

Inactive Publication Date: 2018-10-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since non-aqueous electrolytes have lower ionic conductivity than aqueous electrolytes, it is difficult to reduce the resistance of batteries
In addition, since the solvent of the non-aqueous electrolyte, that is, the organic solvent, is easily decomposed at high temperature and has insufficient thermal stability, the high-temperature cycle life performance of the battery is reduced.
Based on the above facts, the use of solid electrolytes in non-aqueous electrolytes has been studied, but since the ionic conductivity of solid electrolytes is lower than that of non-aqueous electrolytes, batteries with excellent high-current discharge performance cannot be obtained.

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
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no. 1 Embodiment approach

[0024] According to the first embodiment, there is provided a secondary battery including a positive electrode, a negative electrode, a separator, a first electrolyte, and a second electrolyte. The separator is arranged at least between the positive electrode and the negative electrode. The first electrolyte exists at least in the positive electrode. In addition, the first electrolyte contains a lithium salt and an aqueous solvent. The second electrolyte exists at least in the negative electrode. The second electrolyte contains bisfluorosulfonimide salt and an aqueous solvent.

[0025] Bisfluorosulfonyl imide salts, especially lithium bisfluorosulfonyl imide, have excellent solubility in aqueous solvents and dissolve at high concentrations (for example, 8 moL / L or more) in aqueous solvents, so the stability of the second electrolyte can be improved. ionic conductivity. As a result, since the resistance in the negative electrode is reduced, the large current performance of ...

no. 2 Embodiment approach

[0130] According to the second embodiment, it is possible to provide an assembled battery using a secondary battery as a unit cell. As the secondary battery, the secondary battery of the first embodiment can be used.

[0131] Examples of the battery pack include a battery pack including a plurality of unit cells electrically connected in series or in parallel as a constituent unit, a unit including a plurality of unit cells electrically connected in series, or A battery pack or the like of a unit composed of a plurality of unit cells electrically connected in parallel. In a battery pack, multiple types of unit cells or multiple types of cells may be combined.

[0132] A battery pack may also be accommodated in the housing. As the case, a metal can, a plastic container, or the like formed of aluminum alloy, iron, stainless steel, or the like can be used. In addition, the plate thickness of the container is preferably set to 0.5 mm or more.

[0133] Examples of the form in w...

no. 3 Embodiment approach

[0137] According to the third embodiment, it is possible to provide a battery pack including at least one secondary battery according to the first embodiment and a circuit unit for controlling charging and discharging of the secondary battery. A plurality of secondary batteries may be electrically connected in series, in parallel, or a combination of series and parallel. When a battery pack is formed from a plurality of secondary batteries, the battery pack of the second embodiment can be used.

[0138] A battery pack may have a circuit unit connected to a secondary battery before being mounted on a vehicle such as an automobile or an electronic device, but the battery pack in the embodiment includes a battery pack in which a circuit unit included in a vehicle such as an automobile is connected to a secondary battery. As an example of the circuit unit, a protection circuit is included. The protection circuit has a function of controlling charge and discharge of the lithium se...

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Abstract

The invention relates to a secondary battery, a battery pack and a vehicle. A secondary battery with excellent large current performance, circulation performance and storage performance is provided. According to one approach, the secondary battery includes a positive electrode, a negative electrode, a separator, a first electrolyte and a second electrolyte. The separator is arranged at least between the positive electrode and the negative electrode. The first electrolyte is contained at least in the positive electrode. The first electrolyte includes a lithium salt and an aqueous solvent. The second electrolyte is contained at least in the negative electrode. The second electrolyte includes a bis(fluorosulfonyl)imide salt and an aqueous solvent.

Description

technical field [0001] Embodiments of the present invention relate to a secondary battery, a battery pack, and a vehicle. Background technique [0002] Non-aqueous electrolyte batteries using lithium metal, lithium alloys, lithium compounds, or carbonaceous materials as negative electrodes are expected as high-energy-density batteries, and research and development are being actively conducted. So far, there are LiCoO-containing 2 or LiMn 2 o 4 Lithium ion batteries having a positive electrode as an active material and a negative electrode including a carbonaceous material that intercalates and deintercalates lithium ions are widely used for portable devices. [0003] On the other hand, when mounted on vehicles such as automobiles and trains, from the perspective of storage performance in a high-temperature environment (60°C or higher), cycle performance, and long-term reliability of high output, chemical A material with excellent stability, electrochemical stability, str...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M10/0566H01M10/0565H01M2/10B60L11/18
CPCB60L58/10H01M10/0563H01M10/0565H01M10/0566H01M50/20H01M4/485H01M6/045H01M10/052H01M10/054H01M10/0568H01M10/058H01M2220/20Y02E60/10Y02T10/70Y02P70/50H01M10/049
Inventor 高见则雄关隼人松野真辅
Owner KK TOSHIBA
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