Search

EP-4738574-A1 - BATTERY AND ELECTRIC DEVICE

EP4738574A1EP 4738574 A1EP4738574 A1EP 4738574A1EP-4738574-A1

Abstract

The present application discloses a battery and an electric device. The battery includes: a battery cell (20) provided with a first pressure relief mechanism (21); a housing (10) provided with an inner cavity (11); a first separator plate (30) mounted in the housing (10) to separate the inner cavity (11) into a first chamber (111) and a second chamber (112), where the battery cell (20) is mounted in the first chamber (111), the first separator plate (30) is provided with a through hole (31), the first chamber (111) is communicated with the second chamber (112) through the through hole (31), and the first pressure relief mechanism (21) is communicated with the through hole (31) to allow an ejected substance ejected from the battery cell (20) to flow into the second chamber (112); and a cooling device mounted in the second chamber (112), where the cooling device is configured to cool the ejected substance flowing into the second chamber (112). Application of the technical solution of the present application solves the problems that high-temperature substances ejected during thermal runaway of current batteries not only have the risk of being ignited, but also generate continuous thermal shock and radiation to the periphery of the battery, and great thermal harm is caused.

Inventors

  • LI, JINGJING
  • CHEN, XIAOBO
  • HU, Lu

Assignees

  • Contemporary Amperex Technology Co., Limited

Dates

Publication Date
20260506
Application Date
20240702

Claims (13)

  1. A battery, characterized by comprising: a battery cell provided with a first pressure relief mechanism; a housing provided with an inner cavity; a first separator plate mounted in the housing to separate the inner cavity into a first chamber and a second chamber, wherein the battery cell is mounted in the first chamber, the first separator plate is provided with a through hole, the first chamber is communicated with the second chamber through the through hole, and the first pressure relief mechanism is disposed opposite to the through hole to allow an ejected substance ejected from the battery cell to flow into the second chamber; and a cooling device mounted in the second chamber, wherein the cooling device is configured to cool the ejected substance flowing into the second chamber.
  2. The battery according to claim 1, wherein the cooling device comprises a liquid cooling plate, and the liquid cooling plate is mounted in the second chamber; and/or the first separator plate is disposed as the liquid cooling plate.
  3. The battery according to claim 2, wherein the cooling device further comprises a plurality of second separator plates, each of the second separator plates is mounted in the second chamber, two adjacent second separator plates are spaced apart to form a partitioned space, and two adjacent partitioned spaces are communicated with each other.
  4. The battery according to claim 3, wherein one end of each of the second separator plates abuts against the liquid cooling plate, and/or the other end of each of the second separator plates abuts against an inner wall of the housing.
  5. The battery according to claim 3, wherein a plurality of partitioned spaces are sequentially communicated head to tail to form a flow channel.
  6. The battery according to claim 5, wherein the cooling device further comprises a liquid cooling tube, the liquid cooling tube has a first end, a second end, and a cooling tube section connected between the first end and the second end, the cooling tube section is disposed to extend along a flow path of the flow channel, and the first end and the second end respectively pass through the second chamber.
  7. The battery according to any one of claims 3 to 6, wherein the second separator plate is a plate made of metal.
  8. The battery according to any one of claims 3 to 6, wherein the cooling device further comprises an endothermic phase-change material, and the endothermic phase-change material is disposed on the second separator plate.
  9. The battery according to any one of claims 2 to 6, wherein the cooling device further comprises a liquid pump, the liquid pump is configured to pump a cooling liquid to the liquid cooling plate, a pressure sensor and/or a temperature sensor are/is mounted in the second chamber, and the pressure sensor and/or the temperature sensor are/is electrically connected to the liquid pump.
  10. The battery according to claim 1 or 2, wherein the cooling device comprises an endothermic phase-change material, and the endothermic phase-change material is disposed in the second chamber.
  11. The battery according to claim 1 or 2, wherein the cooling device comprises a liquid cooling tube, the liquid cooling tube has a first end, a second end, and a cooling tube section connected between the first end and the second end, the cooling tube section is mounted in the second chamber, and the first end and the second end respectively pass through the second chamber.
  12. The battery according to claim 1, wherein the battery further comprises a second pressure relief mechanism, the second pressure relief mechanism is mounted on a chamber wall of the second chamber, and the second pressure relief mechanism is configured to discharge the ejected substance in the second chamber to the outside.
  13. An electric device, characterized by comprising the battery according to any one of claims 1 to 12.

Description

The present application claims priority to Chinese Patent Application No. 202321806441.1, filed with the China National Intellectual Property Administration on July 11, 2023, entitled "BATTERY AND ELECTRIC DEVICE", the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of new energy batteries, and in particular, to a battery and an electric device. BACKGROUND A battery is designed with an avoidance cavity and an explosion-proof valve. When the battery experiences thermal runaway, ejected substances resulting from thermal runaway of the battery accumulate in the avoidance cavity, and after certain pressure is reached, the explosion-proof valve is opened, and the ejected substances are ejected from the explosion-proof valve. The ejected substances resulting from thermal runaway of the battery generally contain a large amount of high-temperature solid particles and combustible gas, which have the risk of being ignited, and generate continuous thermal shock and radiation to the periphery of the battery, and great thermal harm is caused. SUMMARY An objective of embodiments of the present application is to provide a battery and an electric device, comprising but not limited to solving the problems that high-temperature substances ejected during thermal runaway of current batteries not only have the risk of being ignited, but also generate continuous thermal shock and radiation to the periphery of the battery, and great thermal harm is caused. An embodiment of the present application employs technical solutions below. According to a first aspect of the present application, a battery is provided, comprising: a battery cell provided with a first pressure relief mechanism;a housing provided with an inner cavity;a first separator plate mounted in the housing to separate the inner cavity into a first chamber and a second chamber, wherein the battery cell is mounted in the first chamber, the first separator plate is provided with a through hole, the first chamber is communicated with the second chamber through the through hole, and the first pressure relief mechanism is disposed opposite to the through hole to allow an ejected substance ejected from the battery cell to flow into the second chamber; anda cooling device mounted in the second chamber, wherein the cooling device is configured to cool the ejected substance flowing into the second chamber. In the battery provided in this embodiment of the present application, the housing is separated into the first chamber and the second chamber by using the first separator plate, the first chamber is configured to mount battery cells for assembly to form a key component part of the battery, and the second chamber is formed as an avoidance cavity configured to accommodate the ejected substance ejected from the battery cell when the battery experiences thermal runaway. Moreover, the cooling device is disposed in the second chamber, and when the ejected substance flows into the second chamber, the cooling device can exchange heat with the ejected substance, thereby cooling the ejected substance to make the temperature of the ejected substance lower than an ignition temperature. In this way, even if the ejected substance is discharged from the second chamber to the outside to be in contact with the air, the ejected substance will not be ignited, thereby reducing continuous thermal impact and radiation generated to the periphery of the battery by the ejected substance generated when the battery experiences thermal runaway, and greatly reducing harm of the high-temperature ejected substance to the battery. In some embodiments, the cooling device comprises a liquid cooling plate, and the liquid cooling plate is mounted in the second chamber; and/or the first separator plate is disposed as the liquid cooling plate. A cooling liquid flowing in the liquid cooling plate is used to cool the high-temperature ejected substance generated by the battery cell during thermal runaway, so that the ejected substance is cooled, and the temperature of the ejected substance is reduced to below the ignition temperature. In some embodiments, the cooling device further comprises a plurality of second separator plates, each of the second separator plates is mounted in the second chamber, two adjacent second separator plates are spaced apart to form a partitioned space, and two adjacent partitioned spaces are communicated with each other. In some embodiments, one end of each of the second separator plates abuts against the liquid cooling plate, and/or the other end of each of the second separator plates abuts against an inner wall of the housing. In some embodiments, a plurality of partitioned spaces are sequentially communicated head to tail to form a flow channel. The plurality of second separator plates are used to assist the liquid cooling plate in absorbing heat of the ejected substance, thereby greatly improving effic