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Electric storage device

A technology of storage components and power generation elements, which is applied to electrical components, battery pack components, circuits, etc., can solve problems such as recovery from deterioration, and achieve the effect of reducing and suppressing transient deterioration

Active Publication Date: 2014-10-01
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in Patent Document 1, it is considered that the deterioration is caused by the expansion and contraction of the positive electrode and the negative electrode accompanying the cycle, and it becomes remarkable in the case of a cycle with a large SOC (State of Charge, battery state of charge), However, as a result of the study of the present inventors regarding the transient deterioration which is the subject of the present application, it is clear that the transient deterioration is remarkable in a cycle in which the SOC range is narrowed. It becomes more noticeable when a large current cycle of charging (discharging) or higher is performed, and if it is subjected to a full charge-discharging cycle at a low charge-discharging rate, there is a characteristic of deterioration and recovery.
This is a phenomenon different from the normal cycle deterioration that is the problem in Patent Document 1.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] refer to Figure 1 to Figure 6 , the non-aqueous electrolyte secondary battery 1 which is an example of the energy storage device according to the embodiment of the present invention will be described. The non-aqueous electrolyte secondary battery 1 is preferably for vehicles, more preferably for hybrid vehicles.

[0037] Such as Figure 1 ~ Figure 3 As shown, the non-aqueous electrolyte secondary battery 1 of the present embodiment includes: a container 2; an electrolytic solution 3 accommodated in the container 2; an external gasket 5 mounted on the container 2; and a power generating element 10 accommodated in the container 2. ; and the external terminal 21 electrically connected to the power generating element 10 .

[0038] Such as figure 1 As shown, the container 2 has: a main body (casing) 2a for accommodating the power generating element 10; and a lid 2b for covering the main body 2a. The main body part 2a and the cover part 2b are formed of a stainless steel...

Embodiment approach 2

[0107] Such as Figure 7 As shown, the vehicle-mounted storage battery system 100 in this embodiment includes: the non-aqueous electrolyte secondary battery 1 as the energy storage element of the first embodiment; Section 102. Specifically, the vehicle-mounted battery system 100 includes: a battery module 101 having a plurality of nonaqueous electrolyte secondary batteries 1; control unit 102 .

[0108] When this vehicle-mounted battery system 100 is mounted on a vehicle 110, as Figure 7 As shown, the control unit 102 and the vehicle control device 111 that controls the engine, motor, drive system, electrical system, etc. are connected through an on-vehicle communication network 112 such as an on-vehicle LAN or CAN. The control unit 102 communicates with the vehicle control device 111 , and can control the battery system 100 based on information obtained through the communication. Accordingly, a vehicle including the battery system 100 can be realized.

[0109] As descri...

Embodiment

[0111] In the present example, the effect of the stress of the separator at a compression depth of 5% of the thickness of the negative electrode mixture layer within a predetermined range was studied.

[0112] First, the measurement methods of various values ​​in the examples of the present invention and the comparative examples are described below.

[0113] (thickness of negative electrode mixture layer)

[0114] The thickness of the negative electrode 13 and the thickness after the negative electrode mixture layer 13B is peeled off from the negative electrode 13 are measured, and the difference is divided by 2 to obtain the thickness Ln of the negative electrode mixture layer 13B (one-sided mixture layer thickness). The thickness was measured using a micrometer (manufactured by MITSUTOYO).

[0115] (5% compressive stress)

[0116] The diaphragm is subjected to a load unloading test using a load unloading test device (manufactured by Shimazu Seisakusho, model: MCT-211) usi...

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Abstract

Provided are an electric storage device that reduces temporary deterioration, and an electric storage apparatus that includes a plurality of such electric storage devices. An electric storage device includes: a container; an electrode assembly contained in the container, the electrode assembly including a positive electrode having a positive electrode substrate and a positive electrode active material layer that is formed on the positive electrode substrate and contains a positive electrode active material, a negative electrode having a negative electrode substrate and a negative electrode active material layer that is formed on the negative electrode substrate and contains a negative electrode active material, and a separator interposed between the positive and negative electrodes; and an electrolyte contained in the container, wherein the separator is configured such that a stress caused at a specific compressed depth in the separator, which corresponds to 5% of the thickness of the negative electrode active material layer, is 0.5 MPa or more and 14 MPa or less. An electric storage apparatus includes a plurality of electric storage devices described above.

Description

technical field [0001] The present invention relates to an electric storage element and a vehicle-mounted storage battery system, more specifically, to a storage battery comprising: a positive electrode having a positive electrode active material; a negative electrode having a negative electrode active material; and a diaphragm arranged between the positive electrode and the negative electrode. Electrical components and battery systems for vehicles. Background technique [0002] In recent years, batteries such as lithium-ion batteries, nickel-hydrogen batteries, and capacitors such as electric double-layer capacitors have been used as power sources for various devices such as automobiles and motorcycles, portable terminals, and notebook personal computers. storage element. Such an electric storage device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-265666 (Patent Document 1). [0003] Patent Document 1 discloses a non-aqueous electrolyte sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/14H01G11/06H01G11/52H01M50/406H01M50/414H01M50/417H01M50/434H01M50/451H01M50/489
CPCH01M2/1686H01M2/1673H01M2/1646H01M10/0525H01M4/587H01M2/1653H01M50/46H01M50/451H01M50/489H01M50/414H01M50/417H01M50/434H01M50/406H01M10/0587H01M50/446H01M50/431H01M50/463Y02E60/10Y02T10/70
Inventor 宫崎明彦
Owner GS YUASA INT LTD