CN113571808A

CN113571808A - Battery module

Info

Publication number: CN113571808A
Application number: CN202010354748.7A
Authority: CN
Inventors: 朱晓琼; 卞悦; 刘森; 裘聪; 黎英; 徐志龙; 朱正礼; 姜炜; 王人杰
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-10-29

Abstract

The invention discloses a battery module, comprising: a module housing; the battery cores are arranged in the module shell; the phase change material is used for filling gaps between the inner wall of the module shell and each electric core and at least part of gaps between two adjacent electric cores; a heating member in contact with the phase change material. By adopting the structure, the phase-change material increases the contact area between the heating component and each battery cell, and can more quickly transfer the heat generated by the heating component to the battery cells so as to promote the quick temperature rise of each battery cell; the phase-change material is relatively uniformly distributed in the battery module, and particularly when the phase-change material is in a liquid state, the phase-change material can have better fluidity, so that each part of the battery cell can keep relatively consistent temperature; in addition, the phase-change material can absorb and store heat dissipated by each battery core through phase-change reaction, and can slowly release the stored heat under a low-temperature environment to play a role in heat preservation.

Description

Battery module

Technical Field

The invention relates to the technical field of batteries, in particular to a battery module.

Background

The operating temperature of the battery has a great influence on the reliability, the service life and the service performance of the battery, and generally, the operating temperature of the battery is required to be maintained in a relatively stable temperature range, for example, in a range of 25 ℃ to 40 ℃, so that the reliability, the service life and the service performance of the battery are excellent.

However, in the course of daily use, the environmental temperature often varies greatly due to regional differences, day-and-night differences, seasonal changes, and the like, and particularly, when the environmental temperature is low, the performance of the battery is greatly restricted, and therefore, it is necessary to subject the battery to a warm-up treatment in a low-temperature environment. In view of the above, a conventional solution is to add a heating film on the bottom, top, or side of the battery module to transfer the heat of the heating film to the battery through heat conduction, so as to raise the temperature of the battery to a temperature range with better performance.

However, due to the limited contact area between the heating film and the battery and the low thermal conductivity of the battery, the battery still has a great influence on the performance of the battery due to the problems of long heating time, low heating rate, large temperature difference between the position close to the heat source and the position far away from the heat source, and the like when the heating film is used for heating.

Therefore, how to provide a solution to improve or overcome the above-mentioned drawbacks still remains a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a battery module which can realize rapid temperature rise of each battery cell, relatively uniform temperature of each part of each battery cell and play a role in heat preservation.

In order to solve the above technical problem, the present invention provides a battery module, including: a module housing; the battery cores are arranged in the module shell; the phase change material is used for filling gaps between the inner wall of the module shell and each electric core and at least part of gaps between two adjacent electric cores; a heating member in contact with the phase change material.

By adopting the structure, the phase-change material equivalently increases the contact area between the heating component and each battery cell, and can more quickly transfer the heat generated by the heating component to the battery cells so as to promote the quick temperature rise of each battery cell; and phase change material distributes relatively evenly in the battery module, especially when being liquid, phase change material can have better mobility, can fill each inside clearance of battery module for each position homoenergetic of electricity core can keep the temperature of relatively unanimity, can avoid appearing the great problem of different position difference in temperature to a great extent.

In addition, phase change material can absorb and store the heat that each electric core loses through the phase transition reaction, and under low temperature environment, phase change material can release the heat of storage again slowly through the phase transition reaction to reduce the heat loss rate of battery module when low temperature, and then can play and carry out heat retaining effect to each electric core.

Optionally, the heating component is a heating film, and the heating film is located at the bottom of each battery cell.

Optionally, the battery pack further comprises a heat pipe, wherein the heat pipe can extend between two adjacent battery cores, and the heat pipe is in contact with the heating component.

Optionally, the heat pipe is L-shaped, a transverse portion of the L-shaped heat pipe is in contact with the heating component, and a vertical portion of the L-shaped heat pipe is located between two adjacent electric cores.

Optionally, the phase change material is paraffin.

Optionally, the battery module is a power battery.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a connection structure diagram of the battery cell, the heat pipe and the heating film.

The reference numerals in fig. 1-3 are illustrated as follows:

1, a module shell;

2, a battery cell;

3 a phase change material;

4 heating the part;

5 heat pipe, 51 horizontal part, 52 vertical part.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As used herein, the term "plurality" refers to an indefinite plurality, typically two or more; and when the term "plurality" is used to indicate a quantity of a particular element, it does not indicate a quantitative relationship between such elements.

Referring to fig. 1 to 3, fig. 1 is a schematic structural view of a battery module according to an embodiment of the present invention, fig. 2 is an exploded view of fig. 1, and fig. 3 is a structural view of a connection structure between a battery cell and a heat pipe and a heating film.

As shown in fig. 1 to 3, the present invention provides a battery module including: a module housing 1; the battery cores 2 are arranged in the module shell 1; the phase change material 3 is used for filling gaps between the inner wall of the module shell 1 and each electric core 2 and at least part of gaps between two adjacent electric cores 2; and a heating member 4 in contact with the phase change material 3.

By adopting the structure, the phase-change material 3 equivalently increases the contact area between the heating part 4 and each electric core 2, and can more quickly transfer the heat generated by the heating part 4 to the electric core 2 so as to promote the quick temperature rise of each electric core 2; and phase change material 3 distributes in the battery module evenly relatively, especially when being liquid, phase change material 3 can have better mobility, can fill each inside clearance of battery module for each position homoenergetic of electricity core 2 can keep the temperature of relatively unanimity, can avoid appearing the great problem of different position difference in temperature to a great extent.

In addition, phase change material 3 can absorb and store the heat that each electric core 2 loses through the phase transition reaction, and under low temperature environment, phase change material 3 can release the heat of storage slowly through the phase transition reaction again to reduce the heat rate of losing of battery module when low temperature, and then can play and carry out heat retaining effect to each electric core 2.

The phase-change material 3 herein mainly refers to a material that can absorb heat to change from a solid state to a liquid state during a heating process, and can release heat to the outside to change from a liquid state to a solid state when the ambient temperature is low after the heating process, and the embodiment of the present invention does not limit the specific kind of the phase-change material 3, and in the specific implementation, a person skilled in the art can set the material according to actual needs; for example, paraffin or the like may be used as the phase change material 3.

During initial installation, the phase change material 3 may exist in a solid state, and in conjunction with fig. 2, it may be processed into a frame shape and disposed on the periphery of each cell 2 to facilitate installation; and in the use, because phase change reaction, phase change material 3 can flow in the clearance between each electric core 2 and the clearance between electric core 2 and the module shell 1 after generating liquid state, and at this moment, if phase change material 3 becomes solid state by the liquid state again, its structural style and initial state will have great difference.

The heating component 4 may specifically be a heating film, which may be located at the bottom of each battery cell 2, or located at the upper portion or the side portion of each battery cell 2, and may be determined specifically by combining with the actual situation. Preferably, as shown in fig. 2, the heating component 4 may be disposed at the bottom of each battery cell 2, so that interference generated by the wiring structure at the top of each battery cell 2 when the heating component is disposed at the top can be avoided, insufficient size of the module housing 1 caused by occupation of the internal space of the module housing 1 when the heating component is disposed at the side can also be avoided, and meanwhile, the heating component 4 may be in contact with each battery cell 2, so that the heating component 4 can directly heat each battery cell 2.

Further, a heat pipe 5 may be further included, the heat pipe 5 may extend between two adjacent electric cores 2, and the heat pipe 5 may be in contact with the heating component 4. It can be known that the phase change reaction also occurs inside the heat pipe 5, the heat conduction efficiency is extremely high, and the heat generated by the heating component 4 can be rapidly transferred between the two adjacent electric cores 2, so that the heat transfer area is increased, and the heat transfer efficiency is improved.

Specifically, the heat pipe 5 may be an L-shaped plate-shaped heat pipe, and preferably an ultra-thin heat pipe (generally, a heat pipe 5 having a flat shape and a thickness of less than 2 mm) is used to reduce the space occupied by the heat pipe 5, wherein the horizontal portion 51 of the L-shape may be in contact with the heating member 4, and the vertical portion 52 of the L-shape may be located between two adjacent electric cores 2 to directly heat the two adjacent electric cores 2.

Here, the size of the L-shaped heat pipe 5 is not limited in the embodiment of the present invention, and in the specific implementation, a person skilled in the art may set the size according to actual needs. Preferably, both the horizontal portion 51 and the vertical portion 52 of the heat pipe 5 may have a relatively large area, and as shown in fig. 3, the vertical portion 52 may completely cover one side surface of the battery cell 2 to increase the heat exchange area between the heat pipe 5 and the battery cell 2 as much as possible.

It should be emphasized that the embodiment of the present invention is not limited to the application of the battery module, and may be used as a battery module of a power battery, a battery module of a low-voltage battery for starting a vehicle in a vehicle, and the like.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A battery module, comprising:

a module housing (1);

the battery cores (2) are arranged in the module shell (1);

the phase change material (3) is used for filling gaps between the inner wall of the module shell (1) and the electric cores (2) and at least part of gaps between two adjacent electric cores (2);

a heating means (4) in contact with the phase change material (3).

2. The battery module according to claim 1, wherein the heating member (4) is a heating film, and the heating film is located at the bottom of each battery cell (2).

3. The battery module according to claim 1, further comprising a heat pipe (5), wherein the heat pipe (5) can extend between two adjacent battery cells (2), and the heat pipe (5) is in contact with the heating component (4).

4. The battery module according to claim 3, wherein the heat pipe (5) is L-shaped, a transverse portion (51) of the L-shaped is in contact with the heating component (4), and a vertical portion (52) of the L-shaped is located between two adjacent battery cells (2).

5. The battery module according to any one of claims 1 to 4, wherein the phase change material (3) is paraffin.

6. The battery module according to any one of claims 1 to 4, wherein the battery module is a power battery.