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Battery module

A technology of battery modules and unit cells, which is applied in the direction of lithium batteries, secondary batteries, battery pack components, etc., and can solve problems such as increased internal resistance of batteries, obstacles to large-scale batteries, heavy-load characteristics of batteries, and poor low-temperature characteristics

Inactive Publication Date: 2014-03-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the lithium secondary battery, not only the internal resistance of the battery becomes large, but also the heavy load characteristics and low temperature characteristics of the battery are inferior to those of the aqueous solution system, and it becomes an obstacle to increase the size of the battery due to problems such as heat generation.

Method used

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Embodiment Construction

[0028] The battery module of the present invention is characterized in that it includes two or more unit cells, and includes an airtight case for accommodating the two or more unit cells and a fluid, the unit cells include a stack unit and a battery case, and the stack unit At least a positive electrode, an electrolyte layer, and a negative electrode are stacked, and the above-mentioned battery case accommodates the stacked unit of one unit or two or more units, and two or more of the above-mentioned unit cells are stacked in substantially the same direction as the stacking direction of the stacked unit. A gap member into which the fluid can flow is provided between the unit cells.

[0029] It is known that in a battery, particularly a solid battery using a solid electrolyte, the pressure applied to the electrodes has a large influence on charge and discharge performance. With the conventional method of applying mechanical pressure to fasten electrode laminates along the lamin...

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Abstract

Provided is a battery module having a configuration allowing approximately equal pressure to be applied to each electrode contained in the module. A stack unit comprises a stack of at least a positive electrode, an electrolyte layer, and a negative electrode, and a unit battery comprises a battery case housing one or more of said stack units. This battery module is provided with two or more unit batteries and with a sealed casing which houses said two or more unit batteries and a fluid, and is characterized in that the two or more unit batteries are stacked in the approximately the same direction as the stacking direction of the stack units, and, between the stacked unit batteries, gap members are provided allowing inflow of the fluid.

Description

technical field [0001] The present invention relates to a battery module having a structure capable of applying substantially equal pressure to electrodes included in the module. Background technique [0002] A secondary battery is a battery that converts electrical energy into chemical energy and stores (charges) by passing a current in the opposite direction to that of discharge, in addition to converting the reduced portion of chemical energy accompanying chemical reactions into electrical energy and discharging it. . Among secondary batteries, lithium secondary batteries are widely used as power sources for notebook personal computers, mobile phones, and the like due to their high energy density. [0003] In a lithium secondary battery, when graphite (represented as C) is used as the negative electrode active material, the reaction of the following formula (I) proceeds at the negative electrode during discharge. [0004] Li x C→C+xLi ＋ +xe - (I) [0005] (In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/00H01M2/10H01M50/209
CPCH01M2/1094H01M10/052H01M2/1061Y02E60/122H01M50/209Y02E60/10H01M50/24Y02P70/50
Inventor 笹冈友阳
Owner TOYOTA JIDOSHA KK
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