Assembled battery
An assembled battery has a battery block configured by stacking a plurality of single batteries, and fixing components fixing the plurality of the single batteries. The fixing components include a pair of end plates disposed at both ends in a stacked direction of the plurality of the single batteries, and a metal band making the plurality of the single batteries in a compressed state by coupling end parts of the pair of the end plates each other. Each of the pair of the end plates has a peripheral part and a central part. The pair of the end plates respectively contact both end single batteries located at both ends in the stacked direction at the peripheral parts, and are respectively separated from both end single batteries at the central parts.
1. An assembled battery comprising:
a battery block configured by stacking a plurality of single batteries; and
fixing components fixing the plurality of the single batteries,
wherein the fixing components include a pair of end plates disposed at both ends in a stacked direction of the plurality of the single batteries and in an elongated direction of the battery block, and a metal band configured to compress the plurality of the single batteries by coupling end parts of the pair of the end plates to each other,
each of the pair of the end plates has a peripheral part and a central part, and
the pair of the end plates respectively contact both end single batteries located at both ends in the stacked direction at the peripheral parts, and are respectively separated from both end single batteries at the central parts,
wherein one of the end plates is configured of at least two kinds of different metal materials, and one of the at least two kinds of different materials having a higher hardness is disposed at an inner side contacting the battery block,
wherein the at least two kinds of different metal materials are steel and aluminum, and the one of the at least two kinds of different metal materials having a higher hardness is steel,
wherein the steel has a recess at the central part, the aluminum has a recess at the central part corresponding to the recess of the steel and a plate surface at an outer side.
2. The assembled battery according to claim 1 ,
wherein in one of the end plates, a through hole is provided at the central part.
3. The assembled battery according to claim 1 ,
wherein in one of the end plates, a part is provided at the central part.
4. The assembled battery according to claim 3 ,
wherein in the one of the end plates, the part is formed such that the recess is provided on a surface of the one of the end plates facing the plurality of the single batteries.
5. The assembled battery according to claim 4 ,
wherein a maximum depth of the recess is 0.03 mm or more, and is 10% or less of a thickness in a portion other than the recess.
6. The assembled battery according to claim 1 ,
wherein a portion of one of the end plates contacting the battery block, is adjacent to the metal band.
7. The assembled battery according to claim 1 ,
wherein a recess is provided at a central part of one of the end plates facing the plurality of the single batteries,
wherein an inclination angle of a periphery of the recess is greater than 10 degrees to not hinder swell of one or more of the single batteries.
8. The assembled battery according to claim 7 , wherein the inclination angle of a periphery of the recess is less than or equal to 90 degrees.