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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, secondary battery manufacturing, lithium storage batteries, etc., can solve problems such as tank rupture, voltage rise, and pressure rise

Active Publication Date: 2016-10-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the lithium-ion secondary battery uses an organic electrolyte, if it is in an overcharged state, in addition to the increase in the battery voltage, the pressure of the gas inside the battery will also increase, and the temperature inside the battery will rise, which may cause electrolyte leakage. liquid, tank rupture, etc.

Method used

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Experimental program
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Effect test

no. 1 approach ］

[0025] In the lithium ion secondary battery of this embodiment, a battery with high safety and reliability is realized by arranging an overcharge prevention mechanism inside the battery case in the lithium ion secondary battery.

[0026] That is, the lithium ion secondary battery includes: an electrode assembly formed by winding a positive electrode, a separator, and a negative electrode; an organic electrolyte; a positive electrode lead connected to the positive electrode; a negative electrode lead connected to the negative electrode; and a built-in overcharge prevention mechanism, the battery can is sealed by a cover body, a positive terminal portion fixed to the cover body and connected to the positive electrode lead; and a positive terminal portion fixed to the cover body and connected to the negative electrode lead Connect the negative terminal part.

[0027] Further, the overcharge prevention mechanism includes: a voltage detection unit that detects that the voltage betw...

no. 2 approach ］

[0087] In the above-described embodiment, when the lithium ion secondary battery is in an overcharged state during charging, the fuse body is blown by the action of the overcharge prevention mechanism to cut off the charging current. Charge energy also accumulates and remains in the power generator of the ion secondary battery. In the case of disposing of such a battery, when a situation such as a short circuit between battery electrodes occurs, there is a possibility that energy is released violently and a fire may occur.

[0088]This embodiment is for realizing a mechanism for safely releasing residual energy in an overcharged lithium ion secondary battery.

[0089] The lithium ion secondary battery of this embodiment is as Figure 7 shown, except figure 2 In addition to the configuration of the battery of the illustrated first embodiment, the resistance element 71 is connected in parallel with the fuse body 27 .

[0090] use as a circuit diagram of Figure 8 The operat...

Embodiment 1

[0096] Below, use Figure 4 and will Figure 4 The short circuit closing mechanism part of the enlarged Figure 5 The above embodiments will be described in detail through examples.

[0097] The lithium ion secondary battery of the present embodiment detects an overcharged state based on a rise in voltage.

[0098] First, an electrode assembly was produced by the following method.

[0099] will be composed of LiCoO 2 The constituted positive electrode active material was mixed with a solution obtained by dissolving polyvinylidene chloride in N-methylpyrrolidone to prepare a paste-like positive electrode coating material. The paste-like positive electrode paint was passed through a 70 mesh (mesh) mesh to remove large particles, and then applied to a positive electrode current collector composed of a strip-shaped aluminum foil with a thickness of 12 μm except for the collector tab portion. The front and back sides of the body are dried to form a coating film. The dried str...

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PUM

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Abstract

This embodiment relates to a lithium-ion secondary battery, which is used to avoid damage to the battery due to overcharging and improve safety and reliability. Inside the battery can are built an electrode assembly formed by winding a positive electrode, a separator, and a negative electrode, and an overcharge prevention mechanism. case; a fuse body provided on the positive lead wire or the negative lead wire; and a switch part, the fuse body and the switch part are connected in series to form a short-circuit circuit of the electrode assembly, when charging When the voltage between the positive and negative electrodes becomes equal to or greater than a predetermined value, the voltage detection unit closes the switch member, thereby blowing the fuse body by energy accumulated in the electrode assembly.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. Background technique [0002] In recent years, an automobile using a secondary battery as an energy source has been put into practical use due to the reduction of carbon dioxide emissions, the depletion of fossil fuels such as gasoline, and the like. As such a secondary battery, in addition to being required to have high output, high energy density, reduction in size and weight, and low price, improvements in safety and durability are also indispensable. [0003] As a secondary battery for automobiles with high energy density, a lithium ion secondary battery is known. A typical structure of this high-energy-density lithium ion secondary battery is that an electrode assembly formed by winding a positive electrode and a negative electrode stacked with a separator interposed therebetween is immersed in an organic electrolyte and sealed in a battery can. [0004] Since the lithium ion seco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/34H01M10/04H01M10/052H01M10/0566H01M10/0587H01M10/48H02H7/18H01M50/449H01M50/574H01M50/583H01M50/586
CPCH01M10/0525H01M10/0587H01M10/48H02H7/18H02J7/00H01M50/586H01M50/574H01M50/449H01M50/583H01M10/052H01M10/0566H01M2200/103Y02P70/50Y02E60/10H01M50/446H01M10/425H01M10/63
Inventor 高桥贤一间明田博清濑上清司桥本达也
Owner KK TOSHIBA
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