Battery pack and electric vehicle

Patent metadata

Field	Value
Publication number	US-11569544-B2
Application number	US-202117200269-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 16, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A battery pack includes a first battery case accommodating a plurality of cells, and a second battery case laminated above the first battery case and accommodating a plurality of cells. The first battery case has a first through-hole on an upper surface. The second battery case has a second through-hole on a bottom surface which communicates with the first through-hole. The battery pack includes a communication port composed of the first through-hole and the second through-hole, a gas discharge valve which is provided only in either the first battery case or the second battery case and opens when internal pressure of the battery pack is higher than a predetermined value, and a temperature sensor provided on a gas flow path connected to the gas discharge valve.

First claim

What is claimed is:

1. A battery pack comprising:
a first battery case accommodating a plurality of cells; and
a second battery case laminated above the first battery case and accommodating a plurality of cells, wherein
the first battery case has a first through-hole on an upper surface,
the second battery case has a second through-hole on a bottom surface which communicates with the first through-hole, and
the battery pack includes,
a communication port composed of the first through-hole and the second through-hole,
a gas discharge valve which is provided only in either the first battery case or the second battery case and opens when internal pressure of the battery pack is higher than a predetermined value, and
a temperature sensor provided on a gas flow path connected to the gas discharge valve.

2. The battery pack according to claim 1 , wherein
the temperature sensor is arranged in a vicinity of the gas discharge valve or in a vicinity of the communication port.

3. The battery pack according to claim 1 , wherein
the plurality of cells accommodated in the first battery case and the plurality of cells accommodated in the second battery case each have a gas release valve on an upper surface, and
the gas discharge valve is provided in the second battery case.

4. The battery pack according to claim 1 , wherein
a conductive member which electrically connects the plurality of cells accommodated in the first battery case and the plurality of cells accommodated in the second battery case is arranged in the communication port.

5. An electric vehicle which includes the battery pack according to claim 1 , wherein
the battery pack is arranged below a floor panel, and
the gas discharge valve is provided on a lateral side of the battery pack in a vehicle width direction.

6. The electric vehicle according to claim 5 , wherein
a floor surface facing the gas discharge valve of the floor panel is inclined downward as it goes away from the gas discharge valve.

7. The electric vehicle according to claim 5 , wherein
the first battery case includes at least two battery modules arranged side by side in a front-rear direction of the electric vehicle, and
the communication port is arranged between the two battery modules adjacent to each other in the front-rear direction.

8. The electric vehicle according to claim 5 , wherein
the first battery case accommodates a plurality of battery modules in which the plurality of cells are stacked, and
the communication port is arranged outside in the vehicle width direction with respect to the battery module located on an outermost side in the vehicle width direction.

9. The electric vehicle according to claim 5 , wherein
the battery pack is arranged below a rear seat, and
the floor panel has a vertical wall portion facing the battery pack in front of the battery pack.

10. The electric vehicle according to claim 9 , wherein
a fuel tank is provided behind the battery pack.

11. The electric vehicle according to claim 10 , wherein
the gas discharge valve is located at a front end of a lateral side of the second battery case.

Assignees

• Honda Motor Co Ltd

Inventors

• Okada Tomoyuki
• YASUDA Tomofumi
• Itaya Hiroki

Classifications

• B60K2001/0438

  Arrangement under the floor · CPC title

• H01M50/249

  specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M10/486

  for measuring temperature · CPC title

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title