CN-224217537-U - Battery pack and vehicle

CN224217537UCN 224217537 UCN224217537 UCN 224217537UCN-224217537-U

Abstract

The application provides a battery pack and a vehicle, the battery pack includes: the battery comprises a shell, a plurality of battery cells and a phase change structural member. The shell comprises a heat transfer shell plate, a plurality of battery cells are distributed in the shell and are electrically connected, the phase change structural member is positioned in the shell and comprises a heat conduction encapsulation body and a phase change material, the heat conduction encapsulation body is in contact heat conduction with the outer surface of each battery cell and is in heat conduction with the heat transfer shell plate, the heat conduction encapsulation body is provided with an inner cavity, and the phase change material is accommodated in the inner cavity. The battery pack is beneficial to at least improving the problem of low activity of the battery monomer in a low-temperature environment to a certain extent, and is also beneficial to improving the problem of aggravation of heat generation reaction of the battery monomer in a high-temperature environment.

Inventors

Jiang Kaikang
JIANG YAN
SUN CHANGCHUN
YU ZEQI
CHENG FEI

Assignees

浙江吉利控股集团有限公司
浙江远程新能源商用车集团有限公司
浙江远程商用车研发有限公司

Dates

Publication Date: 20260508
Application Date: 20250506

Claims (13)

1. A battery pack, comprising: a housing comprising a heat transfer shell plate; The battery units are distributed in the shell and are electrically connected; The phase-change structure part is positioned in the shell and comprises a heat-conducting encapsulation body and phase-change materials, wherein the heat-conducting encapsulation body is arranged between the surfaces of the battery monomers and the heat transfer shell plates, is in contact with the outer surfaces of each battery monomer and is used for realizing heat conduction, and is in heat conduction with the heat transfer shell plates, the heat-conducting encapsulation body is provided with an inner cavity, and the phase-change materials are accommodated in the inner cavity.
2. The battery pack of claim 1, wherein the plurality of cells are divided into a plurality of cell rows, each row of the cell rows including at least one of the cells; The heat conduction packaging body comprises first packaging sections, and one first packaging section of the heat conduction packaging body is arranged between every two adjacent rows of battery cell rows; The inner cavity comprises sub-inner cavities positioned in the first packaging sections, and the sub-inner cavities of the plurality of first packaging sections of the heat conduction packaging body are communicated.
3. The battery pack according to claim 2, wherein the heat conductive package further comprises a second package segment connected between adjacent two of the first package segments and located on the same side in the length direction of the two first package segments, and the inner cavity comprises a conduction cavity located in the second package segment, the conduction cavity communicating with sub-inner cavities of adjacent two of the first package segments.
4. The battery pack according to claim 3, wherein the plurality of second package segments are provided, and two second package segments connected to the same first package segment are located at both ends of the first package segment in the length direction.
5. The battery pack of claim 2, wherein the cells of each adjacent two rows of the cell rows are in thermal contact with the first enclosure section between the two rows of cell rows, and/or each first enclosure section has a vent therethrough that is non-conductive with the interior cavity.
6. The battery pack of claim 1, comprising a thermally conductive assembly between the heat transfer shell and the plurality of battery cells, the thermally conductive assembly in thermal contact with both the plurality of battery cells and the thermally conductive enclosure and in thermal contact with the heat transfer shell.
7. The battery pack of claim 6, wherein the thermally conductive assembly comprises a flexible thermally conductive insulating pad in thermal conduction contact with the plurality of battery cells and the thermally conductive enclosure.
8. The battery pack of claim 7, wherein the thermally conductive assembly comprises a thermally conductive plate laminated and thermally conductive between the flexible thermally conductive insulating pad and the thermally conductive shell plate, the thermally conductive plate having a thermal conductivity greater than a thermal conductivity of the flexible thermally conductive insulating pad.
9. The battery pack of claim 8, wherein the thermally conductive assembly comprises a thermally conductive tube disposed between the thermally conductive plate and the flexible thermally conductive insulating pad, the thermally conductive tube having a thermal conductivity greater than a thermal conductivity of the thermally conductive plate.
10. The battery pack of claim 9, wherein a surface of the heat conductive plate facing the flexible heat conductive insulating pad has a groove, and the heat conductive tube is disposed in the groove and in thermal conduction contact with the flexible heat conductive insulating pad.
11. The battery pack of claim 1, wherein the housing comprises a first housing shell and a second housing shell, the first housing shell and the second housing shell being paired and detachably secured together; the second enclosure has the heat transfer shell plate.
12. The battery pack of claim 11, wherein the first housing case comprises an outer sheath, a first insulating adhesive layer, a buffer insulating layer, and a second insulating adhesive layer in this order from an outer surface of the first housing case to an inner surface of the first housing case, and/or, One of a positioning groove and a positioning boss is arranged on the end face of the first shell facing the second shell, the second shell is provided with a side plate surrounding the heat transfer shell plate, the other one of the positioning groove and the positioning boss is arranged on the end face of the side plate facing the first shell, the positioning boss is matched with the positioning groove, and/or, The second housing is a metal piece.
13. A vehicle characterized by comprising a battery pack according to any one of claims 1-12.

Description

Battery pack and vehicle Technical Field The application relates to the technical field of vehicles, in particular to a battery pack and a vehicle. Background With the enhancement of environmental protection consciousness and the adjustment of energy structures, the development and popularization speed of electric vehicles are remarkably increased, and the power of the electric vehicles is not separated from a battery pack. The performance of a battery pack of a vehicle is very sensitive to ambient temperature. Under the low temperature environment, the activity of the battery monomer in the battery pack is lower, so that the capacity of the battery monomer is often reduced, the charge-discharge multiplying power is reduced, and even the charge-discharge can not be normally carried out, thereby reducing the service life of the battery pack and influencing the service state and the endurance mileage of the vehicle. And the battery monomer is in the power supply or charge and discharge process because of taking place energy conversion, has a part of energy to release with heat energy, leads to the thermal reaction of battery monomer to aggravate under high temperature environment, and the risk of thermal runaway of battery monomer increases. Disclosure of utility model The application provides a battery pack and a vehicle, which are beneficial to improving the problem of low activity of a battery monomer in a low-temperature environment at least to a certain extent and improving the problem of aggravation of heat generation reaction of the battery monomer in a high-temperature environment. In a first aspect, the application provides a battery pack comprising a housing, a plurality of battery cells, and a phase change structure. The shell comprises a heat transfer shell plate, a plurality of battery cells are distributed in the shell and are electrically connected, the phase change structural member is positioned in the shell and comprises a heat conduction encapsulation body and a phase change material, the heat conduction encapsulation body is arranged between the surfaces of the battery cells and the heat transfer shell plate, the heat conduction encapsulation body is in contact with the outer surface of each battery cell and is in heat conduction with the heat transfer shell plate, the heat conduction encapsulation body is provided with an inner cavity, and the phase change material is accommodated in the inner cavity. According to the battery pack disclosed by the embodiment of the application, the phase-change structural member is arranged in the shell and comprises the heat-conducting packaging body and the phase-change material arranged in the heat-conducting packaging body, and the heat-conducting packaging body is in contact with the outer surface of each battery cell for heat conduction. In this way, when the battery cells are powered or charged and discharged, heat released by energy conversion of the battery cells can be transferred to the phase change material through the heat conduction packaging body, the phase change material absorbs the heat to change from a first physical state to a second physical state, and the heat is stored, so that the auxiliary heat dissipation effect of the battery cells is improved, meanwhile, redundant heat can be conducted to the outer side of the shell through heat conduction of the heat conduction packaging body and the heat conduction shell plate, the heat dissipation effect of the battery cells is improved, the problem of heat accumulation in a high-temperature environment is avoided, and the use reliability of the battery pack in the high-temperature environment is improved. In the low-temperature environment, the heat stored in the phase change material can be released by utilizing the reverse phase change of the phase change material (namely, the phase change material is changed from the second physical state to the first physical state), so that the heating and heat preservation effects on a plurality of battery monomers are achieved, the risks of capacity attenuation, reduction of charge and discharge multiplying power and even incapability of normal charge and discharge of the battery monomers in the low-temperature environment are reduced, and the endurance mileage of a vehicle in the low-temperature environment and the service life of the battery are improved. In one implementation manner of the first aspect of the application, the plurality of battery cells are divided into a plurality of battery cell rows, each battery cell row comprises at least one battery cell, the heat conduction package body comprises a first package section, one first package section of the heat conduction package body is arranged between every two adjacent battery cell rows, the inner cavity comprises a sub-inner cavity positioned in the first package section, and the sub-inner cavities of the plurality of first package sections of the heat conduction package body are communica