CN219832777U

CN219832777U - Battery pack with flexible heat exchanger and electric vehicle

Info

Publication number: CN219832777U
Application number: CN202320636465.0U
Authority: CN
Inventors: 郑时红; 赵云鹏; 茅新波
Original assignee: Zhejiang Yifei Technology Co ltd
Current assignee: Zhejiang Yifei Technology Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-10-13
Anticipated expiration: 2033-03-23

Abstract

The utility model relates to a battery assembly with a flexible heat exchanger and an electric vehicle. The battery assembly comprises at least one battery pack which is arranged in parallel, the battery pack comprises at least one battery, a flexible heat exchanger is arranged outside the battery pack, the flexible heat exchanger comprises a flexible substrate and heat exchange tubes, the heat exchange tubes are arranged on the flexible substrate, and the heat exchange tubes are arranged between a first collecting tube and a second collecting tube in parallel. The utility model has the technical advantages of convenient package and transportation, high heat exchange efficiency and small occupied space.

Description

Battery pack with flexible heat exchanger and electric vehicle

Technical Field

The utility model relates to a battery assembly with a flexible heat exchanger and an electric vehicle.

Background

The battery pack of the electric vehicle is a power source, and the quality of the working performance of the battery pack directly determines the whole vehicle performance of the electric vehicle. When the battery assembly works in a high-temperature environment or performs high-current charge and discharge, the temperature of the battery can rise rapidly, and the battery pack needs to be cooled rapidly at the moment so as to exchange generated heat, otherwise, the service life of the battery can be reduced, and even safety problems such as fire explosion and the like can be caused. Generally, the heat exchanger needs to be contacted with the battery as large as possible, so that the air thermal resistance of the heat exchanger and the battery is reduced, and the heat exchange is ensured to be sufficient.

Conventional battery pack heat dissipation devices are generally filled in gaps of the columnar batteries, and heat is transferred through contact portions of the heat dissipation devices and the batteries so as to exchange heat emitted by the batteries. For example, chinese patent application 201811613033.8 discloses a liquid cooling thermal management structure for a cylindrical power battery, in which a water inlet main pipe and a water outlet main pipe are respectively disposed at two sides of an inner portion of a battery box, and each battery module is disposed in a determinant, and the battery modules are disposed in a determinant by each battery assembly; in the battery assembly, the electric cores are distributed on four corners, gaps among the electric cores are filled with heat conducting materials to form a heat conducting star-shaped block, the center of the heat conducting star-shaped block is provided with vertical tubules, and the vertical tubules of the battery assembly in the same row are connected into a liquid heat exchange tube through horizontal tubules; the liquid heat exchange tube is communicated with the water inlet main tube and the water outlet main tube at two ends; the heat conducting star blocks in the same row are arranged at different heights, and the heat insulation impact-proof thin plates are arranged to surround the battery assemblies into a unit body with the closed side walls. The technology has the defects that the heat conduction star-shaped block has higher hardness and cannot form close contact with the battery, so that the heat exchange efficiency is reduced; can not be folded, and is inconvenient for packaging and transportation; the horizontal tubules for connecting the batteries are arranged in the up-down direction of the batteries, so that the space occupied by the battery pack is larger; the number of the vertical tubules is only one, and the size is larger, so that the specific surface area of heat exchange is lower, and the heat exchange efficiency is reduced.

Therefore, there is a need in the art for a battery assembly that can be used in an electric vehicle that is convenient to package and transport, has high heat exchange efficiency, and occupies a small space.

Disclosure of Invention

The battery assembly and the electric vehicle with the flexible heat exchanger have the technical advantages of convenience in packaging and transportation, high heat exchange efficiency and small occupied space.

The utility model relates to a battery assembly with a flexible heat exchanger, which comprises at least one battery pack arranged in parallel, wherein the battery pack comprises at least one battery, the flexible heat exchanger is arranged outside the battery pack, the flexible heat exchanger comprises a flexible substrate and a heat exchange tube, the heat exchange tube is arranged on the flexible substrate, and the heat exchange tube is arranged between a first collecting tube and a second collecting tube in parallel.

The first header pipe and the second header pipe can be connected with an external heat exchange assembly to form a heat exchange circulation system; a baffle plate can be arranged in at least one of the first header and the second header; a heat-conducting adhesive can be arranged between the flexible heat exchanger and the outside of the battery pack, or the flexible heat exchanger can be directly arranged outside the battery pack, or the flexible heat exchanger is arranged on the inner wall of a battery box of the battery assembly; the equivalent diameter of the heat exchange tube can be 0.1-4 mm, preferably 0.2-2 mm; the heat exchange tube may be disposed inside the flexible substrate, or the heat exchange tube may be partially exposed from the flexible substrate; the battery assembly may include two or more battery packs, and the flexible heat exchanger may be disposed on the battery packs continuously or at intervals; each of the battery packs may include one or two rows of cells.

The utility model also relates to an electric vehicle comprising a battery assembly, which is a battery assembly as described above.

The flexible base layer of the flexible heat exchanger can be tightly attached to the heat exchange surface formed by the heat exchange tube and the outer surface of the battery to form a good thermal contact relationship, a heat exchange medium flows in from the collecting pipe, the heat of the battery is absorbed by the heat exchange surface contacted with the outer surface of the battery to cool the battery, the heat exchange medium with the heat flows out from the collecting pipe, enters the heat exchanger of the external heat radiating unit, and after fully heat exchange with the external heat exchanger, the heat exchange medium is cooled and flows back into the battery pack again to realize the cooling of the battery. Specifically, the utility model has the following technical advantages:

(1) The flexible heat exchanger can be tightly attached to the surface of the battery, and can adapt to the fluctuation of the surface of the battery, so that the heat exchange efficiency of the battery can be improved, the heat of the battery can be emitted as soon as possible, and the service life and the use safety of the battery are improved;

(2) The equivalent diameter of the heat exchange tube of the flexible heat exchanger is smaller than 4mm, so that the flexible heat exchanger is easy to fold, convenient to package, transport and install, the specific surface area of the heat exchange tube can be greatly increased, the heat exchange efficiency is improved, the material usage amount is reduced, and the manufacturing and installation cost can be reduced.

Drawings

Fig. 1 is a schematic view of a battery pack with a flexible heat exchanger of the present utility model.

Fig. 2 is a schematic view of a flexible heat exchanger of the present utility model.

Fig. 3 is a schematic view of a battery assembly with a flexible heat exchanger of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be arbitrarily combined with each other.

As shown in fig. 1-3, there is shown a schematic view of a battery assembly with a flexible heat exchanger. As shown in the figure, the battery assembly comprises at least one battery pack which is arranged in parallel, the battery pack comprises at least one battery 1, the outside of the battery pack is wrapped with a flexible heat exchanger 3, the flexible heat exchanger 3 and the outside of the battery pack can be adhered through a heat-conducting adhesive 2, and the flexible heat exchanger 3 can be directly wrapped outside the battery pack, so that heat is mainly dissipated in a heat conduction mode. In another embodiment, the flexible heat exchanger 3 may also be laid on the inner wall of the battery box, and the battery assembly may be placed in the battery box. The heat emitted by the battery assembly is convected into the air inside the battery box through heat convection, and then the heat in the air inside the battery box is transferred out through the flexible heat exchanger.

The heat-conducting glue 2 can be made of materials in the prior art, and will not be described in detail. The flexible heat exchanger 3 includes a flexible substrate 30 and a heat exchange tube 31, the heat exchange tube 31 being disposed on the flexible substrate 30. The heat exchange tubes 31 are arranged in parallel between the first header 4 and the second header 5, and the heat exchange tubes 31 and the first header 4 and the second header 5 can be welded and connected. The heat exchange medium flows in through the header in a converging manner, flows in parallel between the parallel pipelines, and flows out through the header in a converging manner. According to the requirement, a baffle plate can be arranged in at least one of the first header 4 and the second header 5, so that the heat exchange medium can flow in stages in the heat exchange tube, the heat exchange efficiency can be better improved, and the prior art in the field is omitted. At this time, there may be a case where the first header 4 or the second header 5 has both the function of the header in pipe or the header out pipe.

The heat exchange tube 31 may be embedded or embedded in the flexible substrate 30, or may be partially exposed from the flexible substrate 30. The flexible substrate 30 is made of the existing material with good heat conduction performance, and in order to meet the requirement of heat conduction, good thermal contact needs to be formed between the heat exchange tube 31 and the flexible substrate 30 and between the flexible substrate 30 and the heat conduction glue 2. The first header 4 and the second header 5 are connected with an external heat exchange assembly, and cooling of the battery is realized through circulation of a heat exchange medium. In the present utility model, the equivalent diameter of the heat exchange tube 31 of the flexible heat exchanger is 0.1 to 4mm, preferably 0.2 to 2.0mm, and may be 1.0mm, for example. The smaller the inner diameter of the tube is, the thinner the tube wall of the heat exchanger is, the better flexibility is realized, the folding, the transportation and the installation are convenient, the heat exchanger can be in closer fit contact with the heat conducting glue on the surface of the battery, the larger heat exchange area can be obtained, the heat exchange effect is improved, and the cost is reduced.

When the battery has more than two groups, a plurality of collecting inlet pipes and a plurality of collecting outlet pipes can be connected, and the connected collecting inlet pipes and collecting outlet pipes are respectively connected with a heat radiating unit outside the battery group, so that the refrigeration cycle of the heat exchange medium is realized. As shown in fig. 3, the first headers 4 of the plurality of groups of cells may be connected, the second headers 5 of the plurality of groups of cells may be connected, and then connected to the inlet and outlet of the heat exchanger of the external heat sink unit, respectively. As shown in fig. 3, each of the battery packs arranged in parallel is one row, and those skilled in the art will recognize that two rows of batteries may be used as one group; the flexible heat exchanger is not arranged outside a row of batteries between two adjacent battery packs wrapped with the flexible heat exchanger, and one skilled in the art knows that the flexible heat exchanger can also be arranged outside each battery pack. That is, the flexible heat exchangers of the present utility model may be arranged at intervals or may be arranged continuously.

The utility model also relates to an electric vehicle comprising a battery assembly with a flexible heat exchanger as described above. The utility model relates to the improvement of a battery assembly, and other battery assemblies can adopt the prior art and are not repeated.

Although the embodiments of the present utility model are described above, the embodiments are only used for facilitating understanding of the present utility model, and are not intended to limit the present utility model. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims

1. The battery assembly with the flexible heat exchanger comprises at least one battery pack which is arranged in parallel, and at least one battery is arranged in the battery pack.

2. The cell assembly of claim 1, wherein the first header and the second header are connected to an external heat exchange assembly to form a heat exchange circulation system.

3. The battery assembly of claim 2, wherein a baffle is disposed within at least one of the first header and the second header.

4. A battery assembly according to any one of claims 1-3, characterized in that a heat conducting glue is arranged between the flexible heat exchanger and the outside of the battery pack, or the flexible heat exchanger is arranged directly on the outside of the battery pack, or the flexible heat exchanger is arranged on the inner wall of the battery box of the battery assembly.

5. The battery pack according to claim 4, wherein the equivalent diameter of the heat exchange tube is 0.1 to 4mm.

6. The battery pack according to claim 4, wherein the equivalent diameter of the heat exchange tube is 0.2 to 2mm.

7. The battery assembly of any one of claims 1-3, 5-6, wherein the heat exchange tube is disposed inside the flexible substrate or partially exposed from the flexible substrate.

8. The battery assembly of any one of claims 1-3, 5-6, wherein the battery assembly comprises more than two battery packs, the flexible heat exchanger being disposed on the battery packs either continuously or at intervals.

9. The battery assembly of claim 8, wherein each of the battery packs comprises one or two rows of cells.

10. An electric vehicle comprising a battery assembly, characterized in that the battery assembly is a battery assembly according to any one of claims 1-9.