CN210897365U

CN210897365U - Battery module and battery pack

Info

Publication number: CN210897365U
Application number: CN201921096048.1U
Authority: CN
Inventors: 殷玉婷; 顾江娜; 李相哲; 许玉林; 王爱淑
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-06-30
Anticipated expiration: 2029-07-12

Abstract

The application discloses battery module and battery package, battery module includes: the heat conducting strips are embedded in gaps among the battery monomers and are in contact arrangement with at least two battery monomers simultaneously; the heat conducting strip is provided with a first end and a second end which are far away from each other, and the first end is abutted to the water cooling plate; and the contact area of the battery monomer and the heat conducting strip is increased gradually from the first end to the second end. Each battery monomer temperature homogeneity is high in the battery module of this application, can promote the life of battery module and battery package.

Description

Battery module and battery pack

Technical Field

The present application relates to a battery module and a battery pack.

Background

The battery pack of the electric automobile mainly comprises a battery box and a battery module accommodated in the battery box, and the battery pack is heated and warmed during charging and discharging, so a liquid cooling system is required to be adopted for cooling the battery pack.

In a battery pack with a cylindrical battery pack, there are two ways to dissipate heat from the cylindrical batteries, one is the cylindrical end face and the other is the cylindrical face. The end faces of the cylindrical battery are divided into positive and negative electrodes. The positive electrode has an explosion-proof valve and cannot form good contact with a cooling system. And the positive and negative electrodes need to form a passage between the batteries through welding or contact with a flow guide structure, so that the addition of a cooling structure on the positive and negative electrodes is difficult. Therefore, the cylindrical surface of the battery is generally selected for heat dissipation. The cylinder face is generally not provided with an electrical connection element, and the area is large, thereby being beneficial to heat dissipation.

Generally, a cylindrical battery module arranged in a matrix is formed by placing a heat conduction structure between battery cells, extending one end of the heat conduction structure to the side of the module, and abutting against a water cooling plate to dissipate heat.

The structure can effectively dissipate heat, but the temperature difference of the module can be obviously increased along with the increase of the number of layers of the module. The increased temperature difference may result in different performance of each battery cell, such as capacity, internal resistance, lifetime, etc. This can lead to a reduction in the overall performance of the battery pack, as well as a reduction in life. Therefore, a reasonable heat conduction structure needs to be designed, so that the temperature of the battery is uniform.

Disclosure of Invention

The purpose of the application is: in order to solve the problems, the battery module and the battery pack provided with the battery module are provided, the temperature uniformity of each battery monomer in the battery module is high, and the service lives of the battery module and the battery pack can be prolonged.

The technical scheme of the application is as follows:

a battery module, comprising:

a plurality of battery cells arranged in a matrix, and

the heat conducting strips are embedded in gaps among the battery monomers and are in contact arrangement with at least two battery monomers simultaneously;

the heat conducting strip is provided with a first end and a second end which are far away from each other, and the first end is abutted to the water cooling plate;

and the contact area of the battery monomer and the heat conducting strip is increased gradually from the first end to the second end.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the battery monomer is cylindrical structure, the surface system of heat conduction strip has a plurality of along from first end to the cambered surface type recess of second end direction interval arrangement in proper order, the free outer peripheral face of battery with the groove wall contact of cambered surface type recess arranges.

The area of each arc-surface groove wall surface on the heat conducting strip is sequentially increased along the direction from the first end to the second end.

The radius of each battery monomer is the same, the radius of each cambered groove is the same, and the groove depth of each cambered groove on the heat conduction strip is gradually reduced from the first end to the second end.

The thickness of the heat conducting strip is gradually reduced from the first end to the second end.

And heat-conducting glue is filled in the cambered surface type groove.

The surfaces of the left side and the right side of the heat conducting strip are respectively provided with a plurality of cambered surface grooves which are sequentially arranged from the first end to the second end at intervals.

The cambered surface type grooves on the surfaces of the left side and the right side of the heat conducting strip are symmetrically arranged.

The heat conducting strip is made of aluminum.

A battery pack comprises a battery box and a battery module which is accommodated in the battery box and has the structure.

The application has the advantages that:

according to the method, the heat conduction contact area between the heat conduction strip and each battery monomer is designed in a differentiated mode, and the heat conduction contact area between the heat conduction strip and each battery monomer which is closer to the water cooling plate is smaller; the battery monomer of keeping away from the water-cooling board more, the heat conduction area of contact with the heat conduction strip is big more to make the free temperature of each battery more homogeneous in the battery module, the difference in temperature is less, has promoted the life of battery module and battery package.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a battery module according to an embodiment of the present disclosure;

fig. 2 is a side view of a battery module according to an embodiment of the present application;

FIG. 3 is a schematic perspective view of a thermal strip according to an embodiment of the present application;

FIG. 4 is a side view of a thermally conductive strip in an embodiment of the present application;

wherein: 1-single battery, 2-heat conducting strip, 201-first end, 202-second end, 203-cambered groove and 3-water cooling plate.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 to 4 show a preferred embodiment of the battery module of the present application, which includes a plurality of cylindrical battery cells 1 and a battery holder (not shown) supporting the battery cells. The battery cells 1 are arranged in a matrix and spaced apart from each other by a small distance. A plurality of heat conducting strips 2 are embedded in the gaps between the battery cells 1, and each heat conducting strip 2 is in simultaneous contact with a plurality of battery cells 1 to absorb and conduct heat of the battery cells 1. In order to lead out the heat absorbed by the heat conducting strip 2, a water cooling plate 3 is arranged on the side part of the battery module, one end of the heat conducting strip 2 is abutted against the water cooling plate 3, so that the heat absorbed by the heat conducting strip is led out to the water cooling plate 3, and then the heat is taken out by the cooling water flowing in the water cooling plate. For convenience of describing the technical solution of the present embodiment, the end of the heat conducting strip 2 abutting against the water-cooled plate 3 is referred to as a first end 201, and the end of the heat conducting strip 2 away from the first end is referred to as a second end 202.

The key improvement of the embodiment is as follows: the contact area between each battery cell 1 and the heat conducting strip 2 increases gradually from the first end 201 to the second end 202. Namely, the closer the battery unit 1 is to the water cooling plate 3, the smaller the heat conduction contact area of the battery unit 1 and the heat conduction strip 2 is; the farther away from the water-cooled plate 3 the battery cell 1 has a larger heat-conducting contact area with the heat-conducting strip 2.

Considering that the battery cells are cylindrical, in order to make each battery cell 1 have a sufficiently large heat-conducting contact area with the heat-conducting strip 2, the present embodiment forms a plurality of arc-shaped grooves 203 on the surface of each heat-conducting strip 2. Wherein, each cambered groove 203 on the heat conducting strip 2 positioned in the middle is divided into two groups which are symmetrically arranged on the left and right side surfaces of the heat conducting strip 2; the arc-shaped grooves 203 on the heat conducting strip 2 located at the side part are only distributed on the side, facing the battery cell 1, of the heat conducting strip 2. The cambered grooves 203 on the heat conducting strip 2 are sequentially arranged at intervals along the direction from the first end 201 to the second end 202, and the outer peripheral surface of the cylindrical battery unit 1 is arranged in contact with the groove wall surface of the cambered grooves 203.

Furthermore, the area of the groove wall surface of each arc-shaped groove 203 on the heat conducting strip 2 increases gradually along the direction from the first end 201 to the second end 202, so as to realize the differential design of the contact area between the heat conducting strip 2 and each battery cell 1.

Considering that each battery cell 1 in the battery module generally adopts the same type of battery, and the length and radius of each battery cell 1 are completely the same, the radius of each arc-shaped groove 203 on the heat conducting strip 2 is also the same in this embodiment, so as to be adapted to each battery cell 1. The groove depth of each cambered groove 203 on the heat conduction strip 2 is gradually reduced from the first end 201 to the second end 202, so that the difference design of the groove wall area of each cambered groove 203 is realized.

Because of the battery monomer 1 symmetry in the battery module arranges, the distance between adjacent battery monomer 1 is the same, and the groove depth of each cambered surface type recess 203 on the heat conduction strip increases progressively once in specific direction, for guaranteeing that every cambered surface type recess 203 all can paste with corresponding battery monomer 1 and lean on the contact completely coincideing, the thickness of heat conduction strip 2 reduces gradually from first end 201 to second end 202 in this embodiment.

According to the calculation formula of the thermal resistance: and R is L/(lambda S), L is a transmission path, lambda is a heat conductivity coefficient, and S is a heat conduction contact area. The contact area and the number of layers can be calculated according to a formula. Assuming that the number of layers of the battery monomer is n, the number of layers where a certain battery monomer is located is x, the number of layers of the battery monomer closest to the water cooling plate is 1, and assuming that the contact area of the nth layer of the battery monomer is S, the contact area S of the xth layer of the battery core is S_xShould be that

In practical application, the contact area can be adjusted within a proper range to achieve the optimal effect

The cambered groove 203 can be filled with heat-conducting glue to fill up a small gap between the cambered groove 203 and the single battery 1, so that the contact between the cambered groove 203 and the single battery 1 is improved.

The heat conducting strip 2 is made of aluminum with low price and high heat conductivity.

And a heat-conducting silica gel pad is clamped between the heat-conducting strip 2 and the water-cooling plate 3, and the heat-conducting silica gel pad and the water-cooling plate are indirectly abutted and arranged.

The battery module of the embodiment can be installed in a battery box to manufacture a power battery pack of an electric automobile.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A battery module, comprising:

a plurality of battery cells (1) distributed in a matrix form, and

the heat conducting strips (2) are embedded in gaps among the battery monomers (1) and are simultaneously in contact with at least two battery monomers (1);

the heat conducting strip (2) is provided with a first end (201) and a second end (202) which are far away from each other, and the first end (201) is abutted with the water cooling plate (3);

the battery is characterized in that the contact area between the battery cell (1) and the heat conducting strip (2) is gradually increased from the first end (201) to the second end (202).

2. The battery module according to claim 1, wherein the battery cell (1) has a cylindrical structure, the surface of the heat conducting strip (2) is provided with a plurality of cambered grooves (203) which are sequentially arranged at intervals along the direction from the first end (201) to the second end (202), and the outer peripheral surface of the battery cell (1) is arranged in contact with the wall surface of the cambered groove (203).

3. The battery module according to claim 2, wherein the area of the groove wall surface of each cambered groove (203) on the heat conducting strip (2) is gradually increased along the direction from the first end (201) to the second end (202).

4. The battery module according to claim 3, wherein the radius of each battery cell (1) is the same, the radius of each arc-shaped groove (203) is the same, and the groove depth of each arc-shaped groove (203) on the heat conducting strip (2) decreases from the first end (201) to the second end (202) in sequence.

5. The battery module according to claim 4, wherein the thickness of the heat conducting strip (2) is gradually reduced from the first end (201) to the second end (202).

6. The battery module according to claim 2, wherein the arc-shaped grooves (203) are filled with a thermally conductive paste.

7. The battery module according to claim 2, wherein the left and right surfaces of the heat conducting strip (2) are respectively formed with a plurality of the arc-shaped grooves (203) which are sequentially arranged at intervals in a direction from the first end (201) to the second end (202).

8. The battery module according to claim 7, wherein the cambered grooves (203) on the left and right side surfaces of the heat conducting strip (2) are symmetrically arranged.

9. The battery module according to claim 1, wherein the heat conducting strip (2) is aluminum.

10. A battery pack, comprising a battery box and a battery module accommodated in the battery box, wherein the battery module is the battery module according to any one of claims 1 to 9.