Battery module

a battery module and battery technology, applied in the field of batteries, can solve the problems of difficult to apply uniform pressure to each battery, battery capacity loss and cycle performance deterioration, and the pressure applied tends to vary between the batteries positioned at both ends and those positioned in the vicinity of the center, so as to prevent the distance between the electrodes from increasing, reduce the loss of battery capacity and cycle performance deterioration, and efficiently release the effect of high-rate discharg
US20080299453A1Inactive Publication Date: 2008-12-04SANYO ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
US Β· United States
Patent Type
Applications(United States)
Current Assignee / Owner
SANYO ELECTRIC CO LTD
Publication Date
2008-12-04
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A battery module has a plurality of prismatic batteries (2) stacked in a thickness direction. Two plates (3, 4) are provided between each of the batteries (2), and each of the batteries (2) is compressed by shifting the two plates (3, 4) in directions away from each other. A pair of frame members (10, 20) having opposing surfaces (11, 21) extending along the stacking direction of the batteries (2) are disposed face to face so as to sandwich the batteries (2) in a direction perpendicular to the stacking direction of the batteries. Wedge-shaped spacers (12, 22) inserted between the two plates (3, 4) are provided respectively on the opposing surfaces. By narrowing the gap between the pair of frame members (10, 20), the spacers (12, 22) are allowed to advance inwardly between the two plates (3, 4) so that the two plates are shifted in directions away from each other, whereby the batteries are compressed.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a battery module in which a plurality of prismatic batteries are retained in a compressed state.

[0003] 2. Description of Related Art

[0004] A battery module has a laminate type casing member and incorporates a plurality of prismatic lithium-ion batteries accommodated in the casing member, each having a plurality of electrode plates laminated with separators sandwiched between them. This type of battery module has a large capacity and shows good performance at high rate current. For this reason, the battery has been used for robots, electric vehicles, and backup power sources, for example.

[0005] In the laminate type prismatic lithium-ion batteries such as described above, expansion and shrinkage of the electrode plates occur during charge and discharge. When the distance between the electrode plates increases, electron conductivity lowers in the positive electrode active material layer and th...

Claims

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