CN209747688U

CN209747688U - Battery module

Info

Publication number: CN209747688U
Application number: CN201920996864.1U
Authority: CN
Inventors: 郑石雄; 李鹏飞
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2019-12-06
Anticipated expiration: 2029-06-28

Abstract

the application relates to the technical field of energy storage devices, in particular to a battery module. The battery module includes: a module main body provided with a plurality of unit cells; the cooling assembly is arranged at the bottom of the module main body; a heat conductive material disposed between the unit cells and the cooling assembly; the cooling assembly comprises a bearing plate, wherein a first bulge is arranged on the bearing plate, and a cavity for accommodating the heat conduction material is formed by the first bulge and the bearing plate in a surrounding manner; along direction of height (Z), first arch with the unit cell butt, first arch is provided with the through-hole, the through-hole with the cavity intercommunication. This application makes the heat conduction material pour into or place behind the cavity through being provided with first arch on cooling module's the loading board to can flow from the through-hole according to the heat conduction material, reach the technological requirement with the coating area of sign heat conduction material, and then solved current heat conduction material and can't make the coating area reach the problem of technological requirement.

Description

battery module

Technical Field

the application relates to the technical field of energy storage devices, in particular to a battery module.

Background

the lithium ion battery is gradually replacing the nickel-hydrogen battery due to the advantages of high energy density, good cycle performance, environmental friendliness and the like, and is widely applied to various consumer electronics industries, electric automobile industries and energy storage fields.

in the prior art, the traditional battery module only controls the temperature of the module through the water cooling plate, and because the heat dissipation conditions of the unit batteries are different, the traditional battery module lacks management of difference. Meanwhile, the coating manner (e.g., coating thickness or coating area) of the heat conductive material disposed between the water cooling plate and the unit cell may not satisfy the above-mentioned heat dissipation condition with difference, for example, the coating thickness is too single, and the coating area is not maximized.

Therefore, a battery module is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

the application provides a battery module to solve the problem that current heat conduction material can't make the coating area reach the technological requirement.

The application provides a battery module, include:

a module main body provided with a plurality of unit cells stacked in a longitudinal direction (X);

The cooling assembly is arranged at the bottom of the module main body;

A heat conductive material disposed between the unit cells and the cooling assembly;

the cooling assembly comprises a bearing plate, wherein a first bulge is arranged on the bearing plate, and a cavity for accommodating the heat conduction material is formed by the first bulge and the bearing plate in a surrounding manner;

Along direction of height (Z), first arch with the unit cell butt, first arch is provided with the through-hole, the through-hole with the cavity intercommunication.

preferably, the height of both ends of the loading plate is lower than the height of the middle of the loading plate along the width direction (Y).

preferably, along the width direction (Y), an included angle C formed between the tangent plane of the lowest point of the two ends of the bearing plate and the tangent plane of the highest point of the middle of the bearing plate is 1-5 degrees.

preferably, the cooling assembly further comprises a cooling substrate disposed below the carrier plate in a height direction (Z);

a second bulge is arranged on the cooling substrate and surrounds the outer side of the first bulge;

An overflow groove is formed between the second bulge and the first bulge and is communicated with the cavity through the through hole.

Preferably, there is a gap between the second protrusion and the unit cell in the height direction (Z).

preferably, the first and second protrusions are abutted with the unit cells, respectively, in a height direction (Z), and the second protrusion is made of a material including a transparent material.

preferably, a cooling flow channel is further arranged on the cooling substrate, and the cooling flow channel is connected with a liquid inlet and a liquid outlet.

Preferably, a plurality of through holes are uniformly distributed on the first bulge;

along the height direction (Z), the top surface of the first protrusion is recessed downwards to form the through hole.

the through hole is formed through the inside of the first protrusion along the height direction (Z).

Preferably, the heat conducting material is heat conducting glue or heat conducting resin.

has the advantages that:

This application is through being provided with first arch on cooling module's the loading board, and first arch and loading board enclose into the cavity that is used for holding the heat conduction material, make the heat conduction material pour into or place behind the cavity to can flow from the through-hole according to the heat conduction material, reach the technological requirement with the coating area of sign heat conduction material, and then solved current heat conduction material and can't make the coating area reach the problem of technological requirement.

it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

fig. 1 is a schematic structural diagram of a battery module provided in the present application;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is a schematic structural view of the cooling module of FIG. 1;

FIG. 5 is an enlarged view of the point B in FIG. 4;

Fig. 6 is a cross-sectional view of the cooling assembly of fig. 1.

Reference numerals:

M-a battery module;

1-a module body;

11-a unit cell;

2-a cooling assembly;

21-a carrier plate;

211 — a first protrusion;

212-a cavity;

213-a through hole;

22-cooling the substrate;

221-a second protrusion;

222-an overflow tank;

223-a gap;

224-cooling channels;

225-liquid inlet;

226-a liquid outlet;

3-heat conducting material.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

in the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

As shown in fig. 1, which is a schematic structural diagram of a battery module provided in the present application, the battery module M can be used as a power source of an electric device (e.g., an electric vehicle). This battery module M includes module main part 1, cooling module 2 and heat conduction material 3, wherein:

a plurality of unit cells 11 stacked one on another in the length direction (X) are provided in the module main body 1, and may be arranged in parallel and/or in series. The cooling module 2 is provided on the module main body 1, and may be provided on a side surface (specifically, a side surface along the width direction (Y)) of the module main body 1 or may be provided on a bottom surface of the module main body 1, for example, and in the present application, it is preferable that the cooling module 2 is provided on the bottom surface of the module main body 1. In this case, the unit cells 11 may have end plates at both ends in the longitudinal direction (X) and side plates at both ends in the width direction (Y), and the cooling module 2 may be fixed to the bottom surface of the module main body 1 by, for example, welding, screwing, and/or gluing.

Referring to fig. 2, the heat conductive material 3 is disposed between the unit cells 11 and the cooling module 2, so that the thermal contact resistance between the unit cells 11 and the cooling module 2 can be reduced to improve the heat transfer efficiency. Further, the heat conductive material 3 may be a heat conductive adhesive, and may also be a heat conductive resin, and the present application preferably selects a heat conductive adhesive, so that it is advantageous to fix the cooling module 2 at the bottom of the module main body 1. Specifically, when the heat conducting material 3 is a heat conducting glue, the heat conducting glue is a single-component, heat conducting and room temperature curing organic silicon adhesive sealant material, and the condensation reaction is carried out on moisture in the air, so that low molecules are released to cause crosslinking and curing, and the high-performance elastomer is vulcanized. The heat-conducting glue can be silica gel which is prepared by mixing organic silica gel serving as a main body and polymer materials such as filling materials, heat-conducting materials and the like, and has good heat-conducting and electric-insulating properties.

referring to fig. 3, the cooling assembly 2 includes a carrier plate 21, a first protrusion 211 is disposed on the carrier plate 21, a cavity 212 for accommodating the heat conductive material 3 is defined by the first protrusion 211 and the carrier plate 21, the first protrusion 211 is disposed with a through hole 213, and the through hole 213 is communicated with the cavity 212. This application is through being provided with first arch 211 on cooling module 2's loading board 21, and first arch 211 and loading board 21 enclose into the cavity 212 that is used for holding heat conduction material 3, make heat conduction material 3 pour into or place behind cavity 212 to can flow from through-hole 213 according to heat conduction material 3 or not, reach the technological requirement with the coating area of sign heat conduction material 3, and then solved the problem that current heat conduction material can't make the coating area reach the technological requirement.

it can be understood that the carrier plate 21 may be integrally formed with the first protrusion 211 or may be separately formed, and the present application preferably integrally forms the carrier plate and the first protrusion, so that the processing cost can be reduced to some extent.

Further, the cooling assembly 2 further includes a cooling substrate 22, and the cooling substrate 22 is disposed below the carrier plate 21 along the height direction (Z); a second protrusion 221 is arranged on the cooling substrate 22, and the second protrusion 221 surrounds the outer side of the first protrusion 211; an overflow groove 222 is formed between the second protrusion 221 and the first protrusion 211, and the overflow groove 222 communicates with the cavity 212 through the through hole 213. In order to prevent the heat conduction material 3 from affecting the appearance of the battery module M after flowing out of the through hole 213 or polluting other product structures, the overflow groove 222 is communicated with the through hole 213, so that the heat conduction material flowing out of the through hole 213 can enter the overflow groove 222, and the good appearance effect of the battery module M is maintained.

further, in order to facilitate the staff to observe whether the overflow groove 222 has the heat conductive material 3 flowing out, an embodiment may be (see fig. 3), in which the first protrusion 211 abuts against the bottom surface of the unit cell 11 and the second protrusion 221 has a gap 223 with the bottom surface of the unit cell 11 along the height direction (Z). That is to say, through setting up gap 223, make things convenient for the staff to observe whether overflow glue has in the overflow launder 222, and then can confirm whether the coating area of heat conduction material 3 satisfies the technological requirement.

another embodiment may be that, along the height direction (Z), the first protrusion 211 and the second protrusion 221 respectively abut against the bottom surfaces of the unit cells 11, and the second protrusion 221 is made of a transparent material, so that the worker can also be assisted in judging the coating area of the heat conductive material 3 by the transparent second protrusion 221. In this embodiment, the second protrusion 221 may be formed by a two-shot molding process or a two-color molding process, which is not described herein again. It will be appreciated that when this embodiment is employed, there is no concern that the thermally conductive material 3 will continue to overflow from the overflow trough 222 through the gap 223.

it should be noted that the heat conductive material 3 can be accommodated in the cavity 212 in advance, and when the cooling module 2 is assembled to the module body 1, the heat conductive material 3 can be pressed open by the supporting plate 21, and whether the coating area of the heat conductive material 3 meets the process requirement is represented by whether the heat conductive material flows out of the through hole 213. After the cooling module 2 is assembled to the module body 1 in advance, glue may be injected (i.e., the thermally conductive material 3 may be injected) into the cavity 212 from one side of the first protrusion 211 or one of the through holes 213 by using a glue injector, and then whether the thermally conductive material 3 flows out from the opposite side or the other through holes 213 may be observed. Both of the above solutions can achieve the purpose of coating, and are not specifically limited herein.

Referring to fig. 1, 2 and 4, the cooling element 2 may be made of metal material with high thermal conductivity, such as aluminum or steel, or may have a plurality of cooling channels 224 for accommodating cooling liquid therein, which is advantageous for increasing the cooling efficiency. Further, the cooling liquid may be a cooling liquid having an antifreezing property or water. In particular implementations, the cooling fluid in the cooling channel 224 may be flowing or non-flowing. In the case of a flowing cooling liquid, the cooling substrate 22 of the cooling module 2 is further provided with a liquid inlet 225 and a liquid outlet 226, and the liquid inlet 225 and the liquid outlet 226 are respectively communicated with the cooling flow channel 224 and provide power for the flow of the cooling liquid in the cooling flow channel 224 by using a water pump (not shown).

Further, the cooling flow passage 224 is in direct contact with the carrier plate 21 to better cool the carrier plate 21. The carrier plate 21 is preferably of a solid structure and may be made of a metal material having high thermal conductivity, such as aluminum or steel.

Referring to fig. 4 and 5, a plurality of through holes 213 are uniformly distributed on the first protrusion 211, and the top surface of the first protrusion 211 is recessed downward along the height direction (Z) to form the through holes 213. It is understood that a through hole 213 may be formed inside the first protrusion 211, for example, the through hole 213 may be a circular through hole 213, a through hole 213 with a plurality of rectangular openings, or another through hole 213. Compared with the through hole 213 formed through the inside of the first protrusion 211, the through hole 213 formed by recessing the top surface of the first protrusion 211 downward can more effectively represent whether the heat conductive material 3 really meets the process requirement of the coating area, otherwise, the coating thickness or the coating area cannot meet the process requirement.

Referring to fig. 4 to 6, along the width direction (Y), the supporting plate 21 is arched, that is, the heights of the two ends of the supporting plate 21 are lower than the height of the middle of the supporting plate 21. This is because the middle portion of the unit cell 11 in the width direction (Y) dissipates heat more slowly, resulting in a higher temperature, and therefore it is necessary to dissipate heat as quickly as possible from the middle portion of the unit cell 11 in the width direction (Y), so as to reduce the coating thickness of the heat conductive material 3, to bring the unit cell 11 closer to the cooling module 2, and to facilitate heat dissipation. On the contrary, the two end portions of the unit cell 11 in the width direction (Y) disperse heat faster, resulting in a lower temperature relative to the middle portion, so that it is necessary to prevent the two end portions of the unit cell 11 in the width direction (Y) from dissipating heat too fast, and thus the coating thickness of the heat conductive material 3 is properly increased, so that the unit cell 11 is farther from the cooling module 2, thereby facilitating the reduction of the heat dissipation rate.

Furthermore, along the width direction (Y), an included angle C formed between the tangent plane at the lowest point of the two ends of the bearing plate 21 and the tangent plane at the highest point in the middle of the bearing plate 21 is 1-5 degrees, so that the differential control of the coating thickness of the heat conduction material 3 is realized.

In conclusion, the present application utilizes the through hole 213 to realize the differentiated control of the coating area of the heat conductive material 3 and utilizes the arched bearing plate 21 to realize the differentiated control of the coating thickness of the heat conductive material 3, and finally realizes the effective control of the temperature of the unit cell 11.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, comprising:

A module main body (1) provided with a plurality of unit cells (11) stacked in a stack in the longitudinal direction (X);

A cooling component (2) arranged at the bottom of the module main body (1);

a heat conductive material (3) disposed between the unit cells (11) and the cooling assembly (2);

the cooling assembly (2) comprises a bearing plate (21), a first protrusion (211) is arranged on the bearing plate (21), and a cavity (212) for accommodating the heat conduction material (3) is enclosed by the first protrusion (211) and the bearing plate (21);

Along direction of height (Z), first arch (211) with cell (11) butt, first arch (211) is provided with through-hole (213), through-hole (213) with cavity (212) intercommunication.

2. the battery module according to claim 1, wherein the height of both ends of the loading plate (21) is lower than the height of the middle of the loading plate (21) in the width direction (Y).

3. the battery module according to claim 2, wherein an angle C formed between a tangent plane of the lowest point of the two ends of the carrier plate (21) and a tangent plane of the highest point in the middle of the carrier plate (21) is 1-5 ° in the width direction (Y).

4. The battery module according to claim 1, wherein the cooling assembly (2) further comprises a cooling base plate (22), the cooling base plate (22) being disposed below the carrier plate (21) in a height direction (Z);

a second bulge (221) is arranged on the cooling substrate (22), and the second bulge (221) surrounds the outer side of the first bulge (211);

An overflow groove (222) is formed between the second protrusion (221) and the first protrusion (211), and the overflow groove (222) is communicated with the cavity (212) through the through hole (213).

5. the battery module according to claim 4, wherein a gap (223) is provided between the second protrusion (221) and the unit cell (11) in the height direction (Z).

6. The battery module according to claim 4, wherein the first protrusion (211) and the second protrusion (221) abut against the unit cells (11), respectively, in the height direction (Z), and the second protrusion (221) is made of a material including a transparent material.

7. The battery module according to claim 4, wherein a cooling channel (224) is further disposed on the cooling substrate (22), and a liquid inlet (225) and a liquid outlet (226) are connected to the cooling channel (224).

8. the battery module according to claim 1, wherein a plurality of through holes (213) are uniformly distributed on the first protrusion (211);

the top surface of the first protrusion (211) is recessed downward in the height direction (Z) to form the through-hole (213).

9. The battery module according to claim 1, wherein a plurality of through holes (213) are uniformly distributed on the first protrusion (211);

The through hole (213) is formed through the inside of the first protrusion (211) in the height direction (Z).

10. The battery module according to any one of claims 1 to 9, wherein the thermally conductive material (3) is a thermally conductive paste or a thermally conductive resin.