Power supply device, electric vehicle and power storage device including power supply device, and method of manufacturing power supply device

Patent metadata

Field	Value
Publication number	US-12132219-B2
Application number	US-201917439856-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Mar 29, 2019
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A power supply device includes a battery stack body in which a plurality of secondary battery cells are stacked, a pair of end plates covering both end surfaces of the battery stack body, and a plurality of fastening members disposed on the side surface of the battery stack body and fasten the end plates to each other. Fastening member includes plate-shaped bar extended in a stack direction of the secondary battery cells, and locking blocks fixed to both ends of plate-shaped bar. Locking block is formed to be thicker than plate-shaped bar, is joined to an end surface of plate-shaped bar, and protrudes toward an outer peripheral surface of the end plate. The end plate is provided with a stopper portion abutting on locking block on a part close to the battery stack body of a fitting portion to which locking block is guided, and locking block is locked to the stopper portion to fasten the end plate with fastening member.

First claim

The invention claimed is:

1. A power supply device comprising:
a battery stack body including a plurality of secondary battery cells each including a prismatic exterior can are stacked;
a pair of end plates covering both end surfaces of the battery stack body, the both ends surfaces being ends along stacking of the battery stack body; and
a plurality of fastening members each disposed on a corresponding one of side surfaces of the battery stack body to fasten the end plates to each other, the side surfaces facing each other, wherein
each of the plurality of fastening members includes
a plate-shaped bar being elongated along a stacking of the plurality of secondary battery cells, and
locking blocks fixed to both ends of the plate-shaped bar, the both ends being ends along a length of the plate-shaped bar,
each of the locking blocks is thicker than the plate-shaped bar, is joined to an end surface of the plate-shaped bar, and protrudes toward an outer peripheral surface of a corresponding one of the end plates relative to an inner surface of the plate-shaped bar,
each of the end plates includes:
a fitting portion on an outer peripheral surface of the end plate, the fitting portion guides a corresponding one of the locking blocks, and
a stopper portion that abuts on the corresponding one of the locking blocks on a part close to the battery stack body of the fitting portion,

each of the locking blocks is locked to the stopper portion of a corresponding one of the plurality of fastening members to fasten a corresponding one of the end plates with the corresponding one of the plurality of fastening members, and
a joint part between each of the locking blocks and the plate-shaped bar is disposed in a same plane on an outer surface of a corresponding one of the plurality of fastening members.

2. The power supply device according to claim 1 , wherein each of the locking blocks is joined to an end surface of the plate-shaped bar in a continuous linear shape.

3. The power supply device according to claim 2 , wherein each of the locking blocks is joined to an end surface of the plate-shaped bar by laser welding or metal inert gas welding.

4. The power supply device according to claim 1 , wherein each of the locking blocks is fixed to an outer peripheral surface of a corresponding one of the end plates via a plurality of bolts.

5. The power supply device according to claim 1 , wherein the plate-shaped bar and each of the locking blocks are any of iron, an iron alloy, SUS, aluminum, an aluminum alloy.

6. The power supply device according to claim 1 , wherein
the plate-shaped bar is bent inward at one or both of upper and lower end edge parts, and
bent pieces covering upper and lower surfaces of the battery stack body are disposed.

7. The power supply device according to claim 1 , wherein
each of the locking blocks is higher in rigidity than the plate-shaped bar, and
the plate-shaped bar is higher in stretchability than each of the locking blocks.

8. An electric vehicle including the power supply device according to claim 1 , the electric vehicle comprising:
the power supply device;
a motor for traveling being supplied electric power from the power source device;
a vehicle body mounting the power supply device and the motor; and
a wheel driven by the motor to cause the vehicle body to travel.

9. A power storage device including the power supply device according to claim 1 , the power storage device comprising:
the power supply device; and
a power supply controller that controls charging and discharging of the power supply device, wherein the power supply controller enables charging of the plurality of secondary battery cells by external electric power and cause the plurality of secondary battery cells to charge.

10. A method of manufacturing a power supply device including
a battery stack body including a plurality of secondary battery cells each including a prismatic exterior can are stacked,
a pair of end plates covering both end surfaces of the battery stack body, the both ends surfaces being ends along stacking of the battery stack body; and
a plurality of fastening members each disposed on a corresponding one of side surfaces of the battery stack body to fasten the end plates to each other, the side surfaces facing each other, the method of steps comprising:
obtaining the plurality of fastening members by linearly joining locking blocks formed to be thicker than a plate-shaped bar on both ends, the both ends being ends along a length of the plate-shaped bar, the plate-shaped bar being elongated along stacking of the secondary battery cells; and
covering both end surfaces of the battery stack body with a pair of end plates including a stopper portion for locking each of the locking blocks is formed, and fastening the end plates to each other by the plurality of fastening members.

11. The method of manufacturing the power supply device according to claim 10 , wherein during obtaining the plurality of fastening members, joining, by welding, each of the locking blocks to an end surface of the plate-shaped bar.

12. A power supply device comprising:
a battery stack body including a plurality of secondary battery cells each including a prismatic exterior can are stacked;
a pair of end plates covering both end surfaces of the battery stack body, the both ends surfaces being ends along stacking of the battery stack body; and
a plurality of fastening members each disposed on a corresponding one of side surfaces of the battery stack body to fasten the end plates to each other, the side surfaces facing each other, wherein
each of the plurality of fastening members includes
a plate-shaped bar being elongated along a stacking of the plurality of secondary battery cells, and
locking blocks fixed to both ends of the plate-shaped bar, the both ends being ends along a length of the plate-shaped bar,
each of the locking blocks is thicker than the plate-shaped bar, is joined to an end surface of the plate-shaped bar, and protrudes toward an outer peripheral surface of a corresponding one of the end plates relative to an inner surface of the plate-shaped bar,
each of the end plates includes:
a fitting portion on an outer peripheral surface of the end plate, the fitting portion guides a corresponding one of the locking blocks, and
a stopper portion that abuts on the corresponding one of the locking blocks on a part close to the battery stack body of the fitting portion,

each of the locking blocks is locked to the stopper portion of a corresponding one of the plurality of fastening members to fasten a corresponding one of the end plates with the corresponding one of the plurality of fastening members,
a protrusion amount (d) of each of the locking blocks with respect to an inner surface of the plate-shaped bar is larger than a height (h) of the stopper portion, and
a gap is disposed between a tip end surface of the stopper portion and an inner surface of the plate-shaped bar.

13. The power supply device according to claim 12 , wherein each of the locking blocks is joined to an end surface of the plate-shaped bar in a continuous linear shape.

14. The power supply device according to claim 13 , wherein each of the locking blocks is joined to an end surface of the plate-shaped bar by laser welding or metal inert gas welding.

15. The power supply device according to claim 12 , wherein each of the locking blocks is fixed to an outer peripheral surface of a corresponding one of the end plates via a plurality of bolts.

16. The power supply device according to claim 12 , wherein t

Assignees

• Sanyo Electric Co

Inventors

• YAMASHIRO Go

Classifications

• H01M50/262

  with fastening means, e.g. locks · CPC title

• H01M50/224

  Metals · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/44 Primary

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• B60K1/04

  of the electric storage means for propulsion · CPC title