Power storage device and vehicle

Patent metadata

Field	Value
Publication number	US-2024405308-A1
Application number	US-202218695496-A
Country	US
Kind code	A1
Filing date	Sep 20, 2022
Priority date	Oct 1, 2021
Publication date	Dec 5, 2024
Grant date	—

Abstract

A power storage device that is less likely to be influenced by an ambient temperature is provided. The power storage device capable of being charged and discharged even in a low-temperature environment is provided. A first secondary battery capable of being charged and discharged even at low temperatures and a general second secondary battery are adjacent to each other in the power storage device. The power storage device having such a structure can use, as an internal heat source in a low-temperature environment, heat generated by charge and discharge of the secondary battery capable of being charged and discharged even at low temperatures. Specifically, the power storage device includes the first secondary battery and the second secondary battery adjacent to each other, the first secondary battery has flexibility, and a value of discharge capacity in discharge at −40° C. is higher than or equal to 50% of a value of discharge capacity in discharge at 25° C.

First claim

1 . A power storage device comprising a first secondary battery and a second secondary battery,
wherein the first secondary battery is used in a first temperature range, wherein the second secondary battery is used in a second temperature range, wherein a lower limit of the first temperature range is lower than a lower limit of the second temperature range, wherein an upper limit of the first temperature range is higher than the lower limit of the second temperature range, wherein an upper limit of the second temperature range is higher than the upper limit of the first temperature range, wherein the first temperature range and the second temperature range each comprise 25° C., and wherein a value of discharge capacity when the first secondary battery is discharged at the lower limit of the first temperature range is higher than or equal to 50% of a value of discharge capacity when the first secondary battery is discharged at 25° C.

2 . The power storage device according to claim 1 ,
wherein the power storage device further comprises a temperature sensor and a control circuit, wherein the temperature sensor is configured to detect a temperature of the second secondary battery, and wherein the control circuit is configured to set the temperature of the second secondary battery within the second temperature range by heat generated by the first secondary battery in a case where a temperature detected by the temperature sensor is lower than the second temperature range.

3 . The power storage device according to claim 2 ,
wherein the second secondary battery is configured to be preheated by the first secondary battery, and wherein the second secondary battery is configured to start discharge to an outside after the temperature of the second secondary battery is set within the second temperature range.

4 . The power storage device according to claim 3 ,
wherein the lower limit of the first temperature range is lower than or equal to −20° C.

5 . The power storage device according to claim 3 ,
wherein the first secondary battery has flexibility.

6 . The power storage device according to claim 5 ,
wherein the first secondary battery comprises a stack and an exterior body, wherein the exterior body has a film-like shape and is folded in half so as to sandwich the stack, and wherein the exterior body comprises a plane in contact with the stack and a plane in contact with the second secondary battery.

7 . The power storage device according to claim 5 ,
wherein the second secondary battery is a cylindrical secondary battery or an angular secondary battery.

8 . The power storage device according to claim 5 ,
wherein the power storage device comprises a plurality of first secondary batteries and a plurality of second secondary batteries, and wherein a number of the plurality of the first secondary batteries is smaller than a number of the plurality of the second secondary batteries.

9 . The power storage device according to claim 5 , comprising a thermal conductive material between the first secondary battery and the second secondary battery.

10 . A vehicle comprising the power storage device according to claim 1 .

11 . A power storage device comprising a first secondary battery and a plurality of second secondary batteries,
wherein the first secondary battery is configured to be bent and in contact with side surfaces of the plurality of the second secondary batteries, wherein the first secondary battery is used in a first temperature range, wherein each of the plurality of the second secondary batteries is used in a second temperature range, wherein a lower limit of the first temperature range is lower than a lower limit of the second temperature range, wherein an upper limit of the first temperature range is higher than the lower limit of the second temperature range, wherein an upper limit of the second temperature range is higher than the upper limit of the first temperature range, wherein the first temperature range and the second temperature range each comprise 25° C., and wherein a value of discharge capacity when the first secondary battery is discharged at the lower limit of the first temperature range is higher than or equal to 50% of a value of discharge capacity when the first secondary battery is discharged at 25° C.

12 . The power storage device according to claim 11 ,
wherein the power storage device further comprises a temperature sensor and a control circuit, wherein the temperature sensor is configured to detect a temperature of each of the plurality of the second secondary batteries, and wherein the control circuit is configured to set the temperature of each of the plurality of the second secondary batteries within the second temperature range by heat generated by the first secondary battery in a case where a temperature detected by the temperature sensor is lower than the second temperature range.

13 . The power storage device according to claim 12 ,
wherein each of the plurality of the second secondary batteries is configured to be preheated by the first secondary battery, and wherein each of the plurality of the second secondary batteries is configured to start discharge to an outside after the temperature of each of the plurality of the second secondary batteries is set within the second temperature range.

14 . The power storage device according to claim 13 ,
wherein the lower limit of the first temperature range is lower than or equal to −20° C.

15 . The power storage device according to claim 13 ,
wherein the first secondary battery has flexibility.

16 . The power storage device according to claim 15 ,
wherein the first secondary battery comprises a stack and an exterior body, wherein the exterior body has a film-like shape and is folded in half so as to sandwich the stack, and wherein the exterior body comprises a plane in contact with the stack and a plane in contact with each of the plurality of the second secondary batteries.

17 . The power storage device according to claim 15 ,
wherein each of the plurality of the second secondary batteries is a cylindrical secondary battery or an angular secondary battery.

Assignees

• Semiconductor Energy Lab

Inventors

• Momma Yohei
• Kakehata Tetsuya
• Ishitani Tetsuji
• Iwaki Yuji
• Tajima Ryota
• Yoshitomi Shuhei

Classifications

• H01M10/6571

  Resistive heaters (arrangements for heating the battery by its resistance to the internal current H01M10/637) · CPC title

• H01M10/637

  characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching (means for preventing undesired use or discharge H01M50/572) · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M2220/20

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

• H01M10/653

  characterised by electrically insulating or thermally conductive materials · CPC title