CN-122000608-A - Battery pack

Abstract

A battery pack includes a battery cell having a safety valve that opens the valve and discharges gas to the outside due to an increase in internal pressure, an exhaust passage through which the gas discharged from the safety valve flows, a heat insulating member that is provided so as to cover the safety valve, and a holding member that holds the heat insulating member, wherein a storage portion is provided at a position opposite to the heat insulating member in a wall portion of the exhaust passage, the heat insulating member insulates the exhaust passage from the battery cell when the safety valve is not opened, and separates the gas discharged from the safety valve from the holding member and stores the gas in the storage portion when the safety valve is opened, and insulates the gas discharged from the safety valve from the wall portion of the exhaust passage.

Inventors

• Shan Xiaxiu

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251029

Priority Date

20241101

Claims (4)

1. 1. A battery pack, characterized in that, the battery pack is provided with: A battery cell having a safety valve that opens a valve due to an increase in internal pressure and discharges gas to the outside; a battery module in which a plurality of the battery cells are arranged; A case accommodating the battery module; An exhaust passage through which the gas discharged from the safety valve flows; A heat insulating member provided so as to cover the relief valve and facing the exhaust passage, and A holding member provided between the battery cell and the case, holding the heat insulating member, A receiving portion is provided in a wall portion of the exhaust passage at a position opposed to the heat insulating member, The heat insulating member insulates the exhaust passage from the battery cell when the safety valve is not opened, and insulates the gas discharged from the safety valve from the wall of the exhaust passage when the safety valve is opened by separating the gas discharged from the safety valve from the holding member and storing the gas in the storage portion.
2. 2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells, The heat insulating member stored in the storage portion is interposed between a wall portion of the exhaust passage and the gas discharged from the safety valve of the valve toward the storage portion while receiving the gas.
3. 3. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells, When the safety valve is opened in any one of the plurality of battery cells, the other battery cells are thermally insulated from the gas in the exhaust passage by the thermal insulation member held by the holding member.
4. 4. The battery pack of claim 3, wherein the battery pack comprises a plurality of battery cells, The battery pack includes a common plate disposed below the case, The exhaust passage is divided by the housing and the common plate, An exhaust hole opening to the exhaust passage is provided at the bottom of the housing, The safety valve is disposed at the lower surface of the battery cell, The holding member is disposed between the lower surface of the battery cell and the bottom of the case, The heat insulating member faces the exhaust passage through the exhaust hole, The storage portion is provided on the common plate and includes a plurality of protrusions protruding toward the battery cell side.

Description

Battery pack Technical Field The present invention relates to a battery pack. Background International publication 2020/110448 discloses that in a battery pack in which an exhaust duct is provided above a battery module, an impact absorbing layer is provided on a surface of the exhaust duct, which surface faces a safety valve of a battery cell, to protect the exhaust duct from high-temperature gas emitted from the safety valve. Disclosure of Invention In the structure described in international publication No. 2020/110448, since a heat insulating member for insulating heat between the battery cell and the gas in the exhaust duct is not provided, when the gas is discharged from the abnormal battery cell to the exhaust duct, the normal cell is heated from the gas in the exhaust duct. In this case, the normal cells are heated to a high temperature and abnormal heat generation starts, and the abnormal heat generation of the battery cells may be linked. Therefore, it is conceivable to provide a heat insulating member for insulating heat between the battery cell and the gas in the exhaust duct. However, if a heat insulating member for insulating the battery cell from the gas in the exhaust duct is added to a structure provided with a heat insulating member for protecting the exhaust duct as in the structure described in international publication 2020/110448, the cost increases. The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a battery pack capable of protecting a wall portion of an exhaust passage and a battery cell from high-temperature gas emitted from the battery cell while suppressing an increase in cost. The battery pack of the present invention is characterized by comprising a battery cell having a safety valve that opens and discharges gas to the outside due to an increase in internal pressure, a battery module in which a plurality of the battery cells are arranged, a case that houses the battery module, an exhaust passage through which gas discharged from the safety valve flows, a heat insulating member that is provided so as to cover the safety valve and faces the exhaust passage, and a holding member that is provided between the battery cell and the case and holds the heat insulating member, wherein a housing portion is provided at a position facing the heat insulating member in a wall portion of the exhaust passage, the heat insulating member insulates the exhaust passage from the battery cell when the safety valve is not opened, and the gas discharged from the safety valve is separated from the holding member and housed in the housing portion by the gas discharged from the safety valve when the safety valve is opened, and insulates the gas discharged from the safety valve from the wall portion of the exhaust passage. In the present invention, the wall portion of the exhaust passage and the battery cell can be protected from the high-temperature gas emitted from the battery cell while suppressing an increase in cost. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like parts, and in which: fig. 1 is a diagram schematically showing a battery pack of an embodiment; fig. 2 is a view showing a heat insulating member for insulating heat between a battery cell and an exhaust passage; fig. 3 is a view showing a state in which the heat insulating member separated from the holding member is housed in the housing portion to insulate the wall portion of the exhaust passage from the gas when the safety valve is opened; fig. 4 is a diagram showing a structure of the housing portion; fig. 5 is a diagram schematically showing a battery pack according to a modification; fig. 6 is a diagram showing a case where the safety valve is opened in the battery pack according to the modification. Detailed Description Hereinafter, a battery pack according to an embodiment of the present invention will be described in detail. The present invention is not limited to the embodiments described below. Fig. 1 is a diagram schematically showing a battery pack according to an embodiment. The battery pack 1 is an electric storage device in which a battery module 3 formed by stacking a plurality of battery cells 2 is housed in a case 4. The battery pack 1 is mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle. In the electric vehicle, the electric power stored in the battery pack 1 is supplied to a motor for running to run. The battery pack 1 includes a battery module 3, a case 4, a common plate 5, a heat insulating member 6, a holding member 7, and an exhaust passage 8. The battery module 3 is a battery pack in which a plurality of battery cells 2 are arranged. The battery module 3 has a laminate in which the battery cells 2 and the cooler 9 are alternately lami