CN-224204225-U - Battery pack, battery device and electricity utilization device

Abstract

The utility model discloses a battery pack, a battery device and an electricity utilization device, and relates to the technical field of batteries. The battery pack comprises a battery core, a thermal expansion piece and a heating piece, wherein the thermal expansion piece is arranged on at least one side of the battery core and is used for generating expansion deformation to squeeze the battery core when being heated, and the heating piece is used for heating the thermal expansion piece. The battery pack disclosed by the utility model is beneficial to improving the energy output of the battery pack by applying controllable restraint force to the battery cells.

Inventors

• WU LEI
• FENG LICHEN
• LI YALEI
• YAN QIJIA
• HE BEIJUN

Assignees

• 比亚迪股份有限公司

Dates

Publication Date

20260505

Application Date

20250321

Claims (15)

1. 1. A battery pack, comprising: a battery cell; The thermal expansion piece is arranged on at least one side of the battery cell and is used for generating expansion deformation to squeeze the battery cell when being heated; And the heating piece is used for heating the thermal expansion piece.
2. 2. The battery pack of claim 1, further comprising a thermal separator positioned between the cells and the thermal expansion member.
3. 3. The battery of claim 1, wherein the thermal expansion member is a shape memory alloy member that is a single pass shape memory alloy member or a double pass shape memory alloy member.
4. 4. The battery pack according to claim 1, wherein the cells are plate-like bodies extending in a first direction, the thermal expansion member is arranged in a second direction with the cells, and the thermal expansion member is disposed toward a largest face of the cells.
5. 5. The battery pack of claim 1, wherein the number of cells is at least two, the at least two cells and the thermal expansion member are arranged in a row along the second direction, and the thermal expansion member is located on at least one side of the cells in the same row.
6. 6. The battery pack of claim 5, wherein the heating element is disposed on a side of the thermal expansion member remote from the cells.
7. 7. The battery pack according to claim 1, wherein at least two cells are provided, and a buffer layer is provided between two adjacent cells.
8. 8. The battery pack according to any one of claims 1 to 7, further comprising an outer frame; And a containing cavity is formed in the outer frame, and the battery cell, the thermal expansion piece and the heating piece are positioned in the containing cavity.
9. 9. The battery pack according to claim 8, wherein the outer frame is circumferentially surrounded to form four sides, at least one of the sides is composed of brackets, and a space is provided between two opposite brackets in the same side to form a heat dissipation surface.
10. 10. The battery pack according to claim 9, wherein the outer frame has end faces at both ends in a longitudinal direction thereof, at least one of the end faces is composed of brackets, and a space is provided between two brackets disposed opposite to each other in the same end face to form a heat dissipation surface.
11. 11. The battery according to any one of claims 1 to 7, wherein the heating member is a heating film attached to the thermal expansion member.
12. 12. The battery pack of any one of claims 1-7, wherein the battery pack has a controller, the heating element being electrically connected to the controller to control the state of the heating element by the cell capacity of the cell.
13. 13. The battery pack according to any one of claims 1-7, wherein the cells are arranged in a plurality of rows, the thermal expansion members being provided at both ends of each row of the cells, and the plurality of rows of the cells being arranged in a third direction.
14. 14. A battery device, characterized by comprising: A tray, at least one set of said battery packs according to any one of claims 1-13, provided on said tray.
15. 15. An electrical device comprising a battery pack according to any one of claims 1-13, or comprising a battery device according to claim 14.

Description

Battery pack, battery device and electricity utilization device Technical Field The utility model relates to the technical field of batteries, in particular to a battery pack, a battery device and an electricity utilization device. Background In the prior art, after a period of use, the capacity of the battery core can be rapidly reduced, and the electric quantity can be only replaced after being consumed. When people retrieve the battery, often still can detect residual electric quantity, and the electric energy utilization ratio of the battery when using still promotes the space. How to improve the electric energy utilization rate of the battery in use is one of the directions to be improved in the prior art. Disclosure of utility model The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the first aspect of the present utility model is to provide a battery pack, which applies a restraining force to the battery cells, so as to help to improve the energy output of the battery pack. A second aspect of the present utility model is directed to a battery device having the above-described battery pack. A third aspect of the present utility model is directed to an electric device having the above-described battery pack, or an electric device having the above-described battery device. The battery pack comprises an electric core, a thermal expansion piece and a heating piece, wherein the thermal expansion piece is arranged on at least one side of the electric core and is used for generating expansion deformation to squeeze the electric core when being heated, and the heating piece is used for heating the thermal expansion piece. According to the battery pack provided by the embodiment of the utility model, the thermal expansion piece is arranged, and the expansion deformation extrusion of the battery core is generated when absorbing heat, so that the contact compactness and the electrochemical reaction efficiency of chemical substances in the battery core are improved, the energy output and the utilization rate of the battery pack are further improved, and the heating piece is arranged, so that the thermal expansion piece can be heated according to the requirement, the thermal expansion piece is controlled, and the flexibility of the battery pack is improved. The battery pack according to some alternative embodiments of the present utility model further includes a thermal separator positioned between the cells and the thermal expansion member. In some alternative embodiments, the thermal expansion member is a shape memory alloy member that is either a single pass shape memory alloy member or a double pass shape memory alloy member. According to some alternative embodiments of the utility model, the battery cell is a plate-shaped body extending along a first direction, the thermal expansion member and the battery cell are arranged along a second direction, and the thermal expansion member is disposed toward a maximum surface of the battery cell. Optionally, the number of the electric cores is at least two, at least two electric cores and the thermal expansion piece are arranged in a row along the second direction, and the thermal expansion piece is positioned on at least one side of the electric cores in the same row. Further alternatively, the heating element is disposed on a side of the thermal expansion element away from the battery cell. According to some alternative embodiments of the present utility model, the battery pack includes at least two battery cells, and a buffer layer is disposed between two adjacent battery cells. According to some alternative embodiments of the utility model, the battery pack further comprises an outer frame, wherein a containing cavity is formed in the outer frame, and the battery cell, the thermal expansion piece and the heating piece are located in the containing cavity. In some alternative embodiments, the outer frame is circumferentially surrounded to form four sides, at least one side is composed of brackets, and a space is reserved between two opposite brackets in the same side to form a radiating surface. Specifically, two ends of the outer frame along the length direction of the outer frame are end faces, and at least one end face consists of a bracket; and in the same end face, a space is reserved between the two opposite brackets so as to form a radiating surface. In some alternative embodiments, the heating element is a heating film attached to the thermal expansion element. Further, the battery pack is provided with a controller, and the heating element is electrically connected with the controller so as to control the state of the heating element according to the cell capacity of the cell. Further alternatively, the electric cores are arranged in multiple rows, the thermal expansion pieces are arranged at two ends of each row of electric cores, and the multiple rows of electric cores are arr