CN-122000639-A - Battery pack

CN122000639ACN 122000639 ACN122000639 ACN 122000639ACN-122000639-A

Abstract

The present invention relates to a battery pack. The battery pack includes a plurality of battery cells, a plurality of bus bars, a first total terminal bus bar, a second total terminal bus bar, a junction box, a battery pack case, a harness assembly, a refrigerant flow path, a temperature sensor, and a temperature detection cable. The first total terminal bus bar extends from the vicinity of the first corner toward the junction box arrangement space. The temperature sensor is disposed in the bottom wall at a position away from the junction box arrangement space. The wiring path of the temperature detection cable is set to extend from the position where the temperature sensor is arranged along one side wall so as to avoid the wire harness assembly in the upper region of the cell arrangement space, and to extend toward the junction box arrangement space so as to avoid the first corner inward.

Inventors

INAMURA TAKASHI
TOYAMA TAKATOSHI

Assignees

泰星能源解决方案有限公司

Dates

Publication Date: 20260508
Application Date: 20251107
Priority Date: 20241108

Claims (8)

1. A battery pack, wherein the battery pack comprises: a plurality of battery cells each constituted by an electric storage device; a plurality of bus bars connecting the plurality of battery cells in series; A first total terminal bus bar connected with a first total terminal, the first total terminal being an electrical connection end portion of the plurality of battery cells connected in series; A second total terminal bus bar connected with a second total terminal, the second total terminal being an electrical connection end of the plurality of battery cells connected in series; a junction box connected with the first total terminal bus bar and the second total terminal bus bar; A battery pack case having a battery cell arrangement space in which the plurality of battery cells are arranged and a junction box arrangement space in which the junction box is arranged; a harness assembly that is formed by bundling voltage detection lines connected to the plurality of bus bars; A refrigerant flow path; a temperature sensor provided in the vicinity of the refrigerant flow path, and A temperature detection cable extending from the temperature sensor toward the junction box arrangement space, The battery pack case has a bottom wall and a pair of side walls rising from the bottom wall and facing each other, The battery cell arrangement space is provided at a single side in a direction along the pair of side walls in the battery pack case, The terminal box arrangement space is disposed at opposite sides of the battery cell arrangement space in a direction along the pair of side walls in the battery pack body, A wire harness assembly arrangement region in which the wire harness assembly is arranged is provided above the battery cell arrangement space, The first total terminal is provided at a first corner that is set on the side of the cell arrangement space that is close to the junction box arrangement space and on a first side wall side of the pair of side walls, The second total terminal is provided at a second corner portion, which is set at a side of the battery cell arrangement space away from the junction box arrangement space and at a second side wall side of the pair of side walls opposite to the first side wall, The first total terminal bus bar extends from the vicinity of the first corner toward the junction box, The second total terminal bus bar extends from the second corner along the second side wall of the pair of side walls toward the junction box, The refrigerant flow path is provided in the bottom wall so that the refrigerant flows through a predetermined path, The temperature sensor is disposed in the bottom wall of the battery cell arrangement space at a position apart from the junction box arrangement space, The wiring path of the temperature detection cable is set to extend from a position where the temperature sensor is disposed along the first side wall so as to avoid the harness assembly arrangement region in an upper region of the battery cell arrangement space, and toward the junction box arrangement space so as to avoid the first corner toward the inside.
2. The battery pack according to claim 1, wherein, The wiring path of the temperature detection cable is set to pass between the cell arrangement space and the first total terminal bus bar and below the first total terminal bus bar after avoiding the first corner inward.
3. The battery pack according to claim 1 or 2, wherein, An insulating portion is provided between the first total terminal bus bar and the bottom wall of the battery pack case, The temperature detection cable passes between the insulating portion and the bottom wall.
4. The battery pack according to claim 3, wherein, The insulating part has a guide extending downward on a lower surface of the insulating part.
5. The battery pack according to claim 4, wherein, The guide member has a pair of guide portions sandwiching the temperature detection cable, The first total terminal bus bar has a portion extending along one of the pair of guide portions.
6. The battery pack according to claim 1 or 2, wherein, A cover is provided over the plurality of battery cells, The cover includes a total terminal cover portion covering at least a part of a portion where the first total terminal bus bar is mounted, The total terminal cover part is configured to be openable and closable relative to the cover, The temperature detection cable passes under the first total terminal bus bar while avoiding the total terminal cover from a portion along the first side wall of the battery pack case.
7. The battery pack according to claim 6, wherein, The temperature sensing cable passes outside the cover.
8. The battery pack according to claim 1 or 2, wherein, The interval of the pair of side walls of the battery pack case corresponds to the size of the plurality of battery cells in the direction in which the pair of side walls face each other.

Description

Battery pack Technical Field The present invention relates to a battery pack. Background Japanese patent application laid-open No. 2013-125612 discloses a battery pack including a module group, a voltage detection line, and a temperature detection line. The module group includes a plurality of stacked unit cells, and is formed in a box shape. The voltage detection line measures the voltage of the single cell in the module. The temperature detection line measures the temperature of the unit cells in the module. The main surface on the side of the module, on which the current lines are arranged longest, is provided with current lines parallel to any one of the sides constituting the main surface. The voltage detection line portion parallel to the current line and the temperature detection line portion parallel to the current line are disposed on a surface other than the main surface. In this battery pack, the influence of electromagnetic noise caused by the current lines is eliminated. In addition, voltage detection and temperature detection can be performed with high accuracy. Japanese patent application laid-open No. 2023-124438 discloses a battery Pack of a so-called Cell-to-Pack structure in which a plurality of battery cells are directly accommodated in a battery Pack case. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-125612 Patent document 2 Japanese patent application laid-open No. 2023-124438 In a Cell-to-Pack structure battery Pack, in order to increase energy density, a container is disposed in a battery case without any gap. Therefore, in the battery case, there is a concern that the housed object interferes with the wiring. Disclosure of Invention The battery pack disclosed herein includes a plurality of battery cells, a plurality of bus bars, a first total terminal bus bar, a second total terminal bus bar, a junction box, a battery pack case, a harness assembly, a refrigerant flow path, a temperature sensor, and a temperature detection cable. Each of the plurality of battery cells is constituted by an electric storage device. The plurality of bus bars connect the plurality of battery cells in series. The first total terminal bus bar is connected with a first total terminal, which is an electrical connection end portion of a plurality of battery cells connected in series. The second total terminal bus bar is connected with a second total terminal, which is an electrical connection end portion of the plurality of battery cells connected in series. The first and second total terminal bus bars are connected with the junction box. The battery case includes a cell arrangement space in which a plurality of cells are arranged and a junction box arrangement space in which a junction box is arranged. The wire harness assembly is configured by bundling voltage detection wires connected to a plurality of bus bars. The temperature sensor is disposed in the vicinity of the refrigerant flow path. The temperature detection cable extends from the temperature sensor toward the junction box arrangement space. The battery pack case has a bottom wall and a pair of side walls facing each other. A pair of side walls stand up from the bottom wall. The cell arrangement space is provided on a single side in a direction along a pair of side walls in the battery case. The terminal box arrangement space is disposed on opposite sides of the battery cell arrangement space in a direction along a pair of side walls within the battery case. A wire harness assembly arrangement region in which the wire harness assembly is arranged is provided above the battery cell arrangement space. The first total terminal is arranged at the first corner. The second total terminal is provided at a second corner portion of the side of the battery cell arrangement space that is away from the junction box arrangement space and a second side wall side of the pair of side walls that is opposite to the first side wall. The first corner is set on the side of the cell arrangement space, which is close to the junction box arrangement space, and on a first side wall side of the pair of side walls. The second corner is set on a side of the cell arrangement space away from the junction box arrangement space and on a second side wall side of the pair of side walls opposite to the first side wall. The first total terminal bus bar extends from the vicinity of the first corner toward the junction box. The second total terminal bus bar extends from the second corner toward the junction box along a second side wall of the pair of side walls. The refrigerant flow path is provided in the bottom wall so that the refrigerant flows through a predetermined path. The temperature sensor is disposed in a bottom wall of the cell arrangement space at a position apart from the junction box arrangement space. The routing path of the temperature detection cable is set to be along the first side wall from the position wh