KR-20260065503-A - BATTERY PACK

Abstract

The battery pack comprises a battery cell having a safety valve that opens the valve to release gas to the outside upon an increase in internal pressure, an exhaust passage through which the gas released from the safety valve flows, an insulating member provided to cover the safety valve, and a retaining support member that holds and supports the insulating member. A receiving portion is provided in the wall portion of the exhaust passage at a position opposite to the insulating member. The insulating member insulates the space between the exhaust passage and the battery cell when the safety valve is not opened, and when the safety valve is opened, it is separated from the retaining support member by the gas released from the safety valve and received in the receiving portion, thereby insulating the space between the gas released from the safety valve and the wall portion of the exhaust passage.

Inventors

• 야마시타 오사무

Assignees

• 도요타지도샤가부시키가이샤

Dates

Publication Date

20260508

Application Date

20250929

Priority Date

20241101

Claims (4)

1. In the case of battery packs, A battery cell having a safety valve that opens the valve to release gas to the outside upon an increase in internal pressure, and A battery module in which a plurality of the above-mentioned battery cells are arranged side by side, and A case accommodating the above battery module, and An exhaust passage through which gas released from the above safety valve flows, and An insulating member provided to cover the above safety valve and facing the above exhaust passage, and A retaining support member provided between the battery cell and the case, and retaining and supporting the insulating member Equipped, A receiving portion is provided in the wall portion of the above exhaust passage at a position facing the insulation member, and A battery pack characterized in that the above insulating member insulates the space between the exhaust passage and the battery cell when the safety valve is not opened, and when the safety valve is opened, it is separated from the holding support member by the gas released from the safety valve and received in the receiving portion, thereby insulating the space between the gas released from the safety valve and the wall of the exhaust passage.
2. In paragraph 1, A battery pack characterized in that the insulating member received in the receiving portion is interposed between the wall of the exhaust passage and the gas while receiving the gas being discharged from the open safety valve toward the receiving portion.
3. In paragraph 2, A battery pack characterized in that, when the safety valve is opened in any of the plurality of battery cells, the other battery cells are insulated from the gas in the exhaust passage by the insulating member supported by the retaining support member.
4. In paragraph 3, A shear panel positioned below the above case, and The above exhaust passage is partitioned by the above case and the above shear panel, and At the bottom of the above case, an exhaust hole is provided that opens into the exhaust passage, and The above safety valve is provided on the lower surface of the battery cell, and The above-mentioned holding support member is provided between the lower surface of the battery cell and the bottom of the case, and The above-mentioned insulating member faces the exhaust passage through the exhaust hole, and A battery pack characterized by the above-mentioned receiving portion being provided on the shear panel and including a plurality of protrusions protruding toward the battery cell.

Description

Battery Pack The present invention relates to a battery pack. International Publication No. 2020/110448 discloses a battery pack having an exhaust duct above a battery module, wherein a shock-absorbing layer is provided on the surface of the exhaust duct facing the safety valve of the battery cell to protect the exhaust duct from high-temperature gas released from the safety valve. In the configuration described in International Publication No. 2020/110448, since no insulating member is provided to insulate the space between the battery cell and the gas within the exhaust duct, when gas is released from an abnormal battery cell into the exhaust duct, the normal cell absorbs heat from the gas within the exhaust duct. In this case, the normal cell becomes high temperature and begins abnormal heat generation, raising concerns that abnormal heat generation in the battery cells may occur in a chain reaction. Therefore, it is possible to consider providing an insulating member to insulate the space between the battery cell and the gas within the exhaust duct. However, if an insulating member is added to insulate the gas between the battery cell and the exhaust duct in a structure provided with an insulating member that protects the exhaust duct, as described in International Publication No. 2020/110448, the cost increases. The present invention has been made in consideration of the above circumstances and aims to provide a battery pack capable of protecting the wall of the exhaust passage and the battery cell from high-temperature gas emitted from the battery cell while suppressing an increase in cost. A battery pack according to the present invention comprises a battery cell having a safety valve that opens the valve to release gas to the outside upon an increase in internal pressure, a battery module in which a plurality of the battery cells are arranged side by side, a case that accommodates the battery module, an exhaust passage through which gas released from the safety valve flows, an insulating member provided to cover the safety valve and facing the exhaust passage, and a retaining support member provided between the battery cell and the case and holding and supporting the insulating member, wherein a receiving portion is provided in a position opposite to the insulating member in the wall portion of the exhaust passage, and the insulating member insulates the space between the exhaust passage and the battery cell when the safety valve is not opened, and when the safety valve is opened, is separated from the retaining support member by the gas released from the safety valve and accommodated in the receiving portion, thereby insulating the space between the gas released from the safety valve and the wall portion of the exhaust passage. In the present invention, the wall of the exhaust passage and the battery cell can be protected from high-temperature gas emitted from the battery cell while suppressing the increase in cost. The 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 similar elements are indicated by similar reference numerals. FIG. 1 is a schematic drawing illustrating a battery pack in an embodiment. Figure 2 is a drawing illustrating an insulating member that insulates between a battery cell and an exhaust passage. FIG. 3 is a drawing illustrating a state in which an insulating member separated from a retaining support member is received in a receiving portion when the safety valve is opened, insulating the wall of the exhaust passage from the gas. Figure 4 is a drawing illustrating the structure of the receiving section. FIG. 5 is a schematic diagram illustrating a battery pack in a modified example. FIG. 6 is a diagram illustrating the case where the safety valve in the battery pack is opened in a modified example. Hereinafter, a battery pack in an embodiment of the present invention will be described in detail. Furthermore, the present invention is not limited to the embodiments described below. FIG. 1 is a schematic diagram illustrating a battery pack in an embodiment. The battery pack (1) is a storage device that houses a battery module (3), in which a plurality of battery cells (2) are stacked, inside a case (4). The battery pack (1) is mounted in an electrified vehicle such as a battery electric vehicle or a hybrid electric vehicle. In an electrified vehicle, the power stored in the battery pack (1) is supplied to a driving motor to drive. The battery pack (1) comprises a battery module (3), a case (4), a shear panel (5), an insulating member (6), a retaining support member (7), and an exhaust passage (8). The battery module (3) is a battery in which a plurality of battery cells (2) are arranged side by side. The battery module (3) has a laminate in which battery cells (2) and coolers (9) are alternately stacked. The cooler (9) has a flow path thr