CN218827443U

CN218827443U - Liquid cooling board, battery package and electric vehicle

Info

Publication number: CN218827443U
Application number: CN202222655074.1U
Authority: CN
Inventors: 朱列群; 胡世超; 张耀升; 王欢欢; 赖庆
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-04-07
Anticipated expiration: 2032-10-09

Abstract

The application discloses liquid cooling board, battery package and electric vehicle. The liquid cooling plate is applied to the battery pack and comprises a first insulating plate, a second insulating plate and a liquid flowing pipeline; the first insulating plate and the second insulating plate are stacked, and the liquid flow pipeline is clamped between the first insulating plate and the second insulating plate; the liquid flow conduit is configured to: liquid used for cooling or heating the battery core in the battery pack flows in the liquid flow pipeline; the liquid flow pipeline is bent and spirally arranged and forms a gap part; the liquid cooling plate further comprises a filler layer, and the filler layer is filled in the gap portion. The liquid cooling plate provided by the embodiment of the application can improve the insulating property of the battery pack, so that the use safety of the battery pack is improved.

Description

Liquid cooling board, battery package and electric vehicle

Technical Field

The application relates to the technical field of power batteries, in particular to a liquid cooling plate, a battery pack and an electric vehicle.

Background

The power source of the electric automobile is a lithium ion battery, and the lithium ion battery has the advantages of high energy density, long cycle, high energy conversion efficiency and the like; the stability, life, safety and reliability of the lithium ion battery are important bases for new energy automobile power consideration, and therefore, the improvement of various performances of the lithium ion battery is always a key point of attention in the industry.

The optimum working temperature range of the lithium ion battery is narrow, and if the optimum working temperature range is exceeded, the basic performance of the battery is obviously reduced, so that the service life and the safety of the battery are influenced. For example, lithium ion batteries provide electric energy by severe chemical reactions occurring inside the batteries during operation, and generate a large amount of heat during charging and discharging, which causes the temperature of the batteries to rise, and the temperature of the batteries directly affects the safety, the charging and discharging capacity, the efficiency, the cycle life and other performances of the batteries, thereby affecting the working performance of the whole vehicle. For example, when the ambient temperature is too low, not only the discharge performance and the charge acceptance of the battery are greatly reduced due to the influence of the low-temperature environment, but also the lithium precipitation phenomenon of the negative electrode can be caused by the low-temperature charge, the capacity of the battery is rapidly reduced, and in extreme cases, the short circuit of the positive electrode and the negative electrode can even be caused.

In order to provide a more balanced working environment for the battery, a liquid cooling plate is often required to be used for cooling or heating the battery. However, the liquid cooling plate in the prior art is made of pure aluminum alloy, which not only has poor insulation safety performance and heavy weight, but also has the problem of poor sealing performance with the vehicle body.

In view of the above, a new technical solution is needed to solve at least one of the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a new solution for a liquid cooling panel, a battery pack and an electric vehicle.

According to a first aspect of the present application, there is provided a liquid cooling plate applied to a battery pack, the liquid cooling plate including a first insulating plate, a second insulating plate, and a liquid flow pipe;

the first insulating plate and the second insulating plate are stacked, and the liquid flow pipeline is clamped between the first insulating plate and the second insulating plate;

the liquid flow conduit is configured to: liquid for cooling or heating the battery core in the battery pack flows in the liquid flow pipeline;

the liquid flow pipeline is bent and spirally arranged and forms a gap part; the liquid cooling plate further comprises a filler layer, and the filler layer is filled in the gap portion.

Optionally, the first insulating plate is configured to be connected with cells in a battery pack; the first insulating plate is made of a composite material formed by adding metal powder and/or crystal powder into glass fibers.

Optionally, the second insulating plate is made of glass fiber or carbon fiber.

Optionally, the liquid cooling plate further comprises a water nozzle in communication with the liquid flow conduit.

Optionally, the water nozzle is provided with a water inlet and a water outlet, one end of the liquid flow pipeline is connected with the water inlet, and the other end of the liquid flow pipeline is connected with the water outlet.

Optionally, the material of the liquid flow pipeline is metal.

Optionally, the material of the filler layer is a composite material formed by adding metal powder and/or crystal powder to epoxy resin.

Optionally, the first insulating plate, the second insulating plate, the liquid flow pipe and the filler layer are formed by compression molding or vacuum molding.

According to a second aspect of the present application, there is provided a battery pack comprising a liquid-cooled plate as described in the first aspect.

According to a third aspect of the present application, there is provided an electric vehicle including the battery pack according to the second aspect.

The technical scheme adopted by the application can achieve the following beneficial effects:

the liquid cooling plate provided by the embodiment of the application can improve the insulating property of the battery pack, so that the use safety of the battery pack is improved.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

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

FIG. 1 is a schematic diagram of a liquid-cooled panel according to one embodiment of the present application.

Description of the reference numerals:

1. a liquid-cooled plate; 101. a first insulating plate; 102. a second insulating plate; 103. a liquid flow conduit; 104. a water nozzle; 105. a filler layer.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to FIG. 1, according to one embodiment of the present application, a liquid cold plate is provided. The liquid cooling plate 1 is applied to a battery pack, and the liquid cooling plate 1 comprises a first insulating plate 101, a second insulating plate 102 and a liquid flowing pipeline 103; the first insulating plate 101 and the second insulating plate 102 are stacked, and the liquid flow pipe 103 is interposed between the first insulating plate 101 and the second insulating plate 102; the liquid flow conduit 103 is configured to: liquid for cooling or heating the battery cells in the battery pack flows in the liquid flow pipeline 103.

In the liquid-cooled panel provided in the embodiment of the present application, a liquid flow duct 103 is interposed between the first insulating plate 101 and the second insulating plate 102. When the battery core in the battery pack needs to be cooled, cooling liquid with lower temperature is introduced into the liquid flow pipeline 103; when the electric core in the battery pack needs to be heated and heated, liquid with higher temperature is introduced into the liquid flow pipeline 103.

For the liquid cooling plate provided by the embodiment of the application, the first insulating plate 101 and the second insulating plate 102 with insulating performance are adopted, so that the liquid cooling plate has high insulating safety performance. Even if the battery core in the battery pack leaks or is out of control due to heat, and the insulating layer in the battery pack is damaged, the first insulating plate 101 and the second insulating plate 102 still have an insulating effect, so that the high-voltage short circuit and arc discharge phenomena can be avoided, and the insulating property of the battery pack is improved. In the prior art, the liquid cooling plate is entirely made of pure aluminum alloy, so that if liquid leakage or thermal runaway occurs to a battery core in the battery pack, the aluminum liquid cooling plate as a conductor can cause high-voltage short circuit and arc discharge.

In conclusion, the liquid cooling plate provided by the embodiment of the application can improve the insulating property of the battery pack, so that the use safety of the battery pack is improved.

Referring to fig. 1, in one embodiment, the first insulating plate 101 is configured to be connected to cells in a battery pack; the first insulating plate 101 is made of a composite material formed by adding metal powder and/or crystal powder to glass fiber.

In a specific example, the first insulating plate 101 is used as a structural member directly connected to the battery cell in the battery pack, and is made of a composite material formed by adding metal powder and/or crystal powder to glass fiber, and the composite material has good heat conductivity, so that the liquid cooling plate can provide good temperature regulation effect for the battery pack. Alternatively, the metal powder may be, for example, at least one of Cu powder, al powder, ni powder, and Sn powder; alternatively, the crystalline powder may be, for example, boron nitride powder.

Referring to fig. 1, in one embodiment, the second insulating plate 102 is made of glass fiber or carbon fiber.

In a specific example, the second insulating plate 102 supports the liquid flow pipe 103, and serves as a support body for the whole liquid cooling plate, and the second insulating plate 102 is made of glass fiber or carbon fiber, so that the second insulating plate has high tensile strength and high deformation resistance, and can achieve a good supporting effect.

Referring to fig. 1, in one embodiment, the liquid cooling plate further comprises a water nozzle 104, and the water nozzle 104 is communicated with the liquid flow pipeline 103.

In a specific example, the liquid flowing in the liquid flow pipe 103 for heat exchange with the battery pack enters and exits via the water nozzle 104; that is, the water nozzle 104 is provided with a water inlet and a water outlet, one end of the liquid flow pipe 103 is connected with the water inlet, and the other end of the liquid flow pipe 103 is connected with the water outlet.

Referring to fig. 1, in one embodiment, the liquid flow conduit 103 is bent and coiled and forms a gap portion.

In one specific example, the liquid flow conduit 103 is made of metal to form a closed cavity type flow channel; the liquid flowing pipeline 103 is bent and spirally arranged between the first insulating plate 101 and the second insulating plate 102, so that the contact area between the liquid flowing pipeline 103 and the battery cell in the battery pack is large, and a good heat exchange effect is achieved.

Referring to fig. 1, in one embodiment, the liquid cooling plate further includes a filler layer 105, and the filler layer 105 is filled and disposed in the gap portion.

In a specific example, the gap portion formed by bending and coiling the liquid flow conduit 103 is filled with a filler layer 105, which can fix the liquid flow conduit 103, so that the liquid flow conduit 103 is connected between the first insulating plate 101 and the second insulating plate 102 more firmly.

Referring to fig. 1, in one embodiment, the material of the filler layer 105 is a composite material formed by adding metal powder and/or crystal powder to epoxy resin.

In a specific example, the filler layer 105 is made of a composite material formed by adding metal powder and/or crystal powder to epoxy resin, so that the filler layer 105 not only can fix the liquid flow pipeline 103, but also can perform a good heat conduction function, thereby improving the heat exchange effect between the liquid cooling plate and the battery pack.

Referring to fig. 1, in one embodiment, the first insulating plate 101, the second insulating plate 102, the liquid flow conduit 103, and the packing layer 105 are formed by compression molding or vacuum forming.

In a specific example, when manufacturing the liquid-cooled plate, the second insulating plate 102 is first laid on a mold, the liquid flow pipe 103 is then fixed to the second insulating plate 102, a filler material is then added to the gap formed by bending and coiling the liquid flow pipe 103 to form the filler layer 105, and finally the first insulating plate 101 is laid on the liquid flow pipe 103 and the filler layer 105 and is formed by a compression molding process or a vacuum forming process.

In the above manufacturing process, the filler layer 105 can protect the liquid flow tube 103 from being crushed when the second insulating plate 102 and the first insulating plate 101 are molded.

In the prior art, the flow channel for the liquid to flow through is formed on the liquid cooling plate in an integrated punch forming mode, and the surface of the liquid cooling plate is provided with the bulge corresponding to the flow channel, so that the surface of the liquid cooling plate is uneven, and the sealing effect between the liquid cooling plate and the vehicle body is greatly influenced.

In the liquid-cooled plate provided in the embodiment of the present application, the independent liquid flow pipe 103 is directly sandwiched between the first insulating plate 101 and the second insulating plate 102, and the first insulating plate 101, the second insulating plate 102, and the liquid flow pipe 103 are fixed by molding through a compression molding process or a vacuum molding process, without performing a punching operation on the first insulating plate 101 and the second insulating plate 102, and the surfaces of the first insulating plate 101 and the second insulating plate 102 have no protrusions, so that the surfaces of the first insulating plate 101 and the second insulating plate 102 are flat, and thus, a good sealing performance between the liquid-cooled plate and a vehicle body can be ensured.

The liquid cooling plate provided by the embodiment of the application not only has good insulating property, but also can be effectively sealed with the vehicle body. In addition, the density of the composite material used for the first insulating plate 101 and the second insulating plate 102 in the liquid-cooled plate is much lower than that of a pure aluminum alloy, and therefore, the weight of the liquid-cooled plate is reduced compared to the liquid-cooled plate made of a pure aluminum alloy in the prior art.

According to another embodiment of the present application, there is provided a battery pack including the liquid-cooled plate 1 as described above. The battery core in the battery pack is connected with the liquid cooling plate 1, and heat exchange is carried out between liquid flowing in the liquid flowing pipeline 103 arranged in the liquid cooling plate 1 and the battery core, so that the battery core is subjected to temperature regulation.

According to yet another embodiment of the present application, there is provided an electric vehicle including the battery pack as described above.

In the above embodiments, the differences between the embodiments are described with emphasis, and different optimization features between the embodiments may be combined to form a better embodiment as long as the differences are not contradictory, and in consideration of the brevity of the text, no further description is given here.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A liquid cooling plate is characterized by being applied to a battery pack and comprising a first insulating plate (101), a second insulating plate (102) and a liquid flowing pipeline (103);

the first insulating plate (101) and the second insulating plate (102) are stacked, and the liquid flow pipe (103) is interposed between the first insulating plate (101) and the second insulating plate (102);

the liquid flow conduit (103) is configured to: liquid for cooling or heating the battery cells in the battery pack flows in the liquid flow pipeline (103);

the liquid flow pipeline (103) is bent and spirally arranged and forms a gap part; the liquid cooling plate further comprises a filler layer (105), and the filler layer (105) is filled in the gap portion.

2. The liquid cooled plate of claim 1, wherein the first insulating plate (101) is configured to connect to a cell in a battery pack; the first insulating plate (101) is made of a composite material formed by adding metal powder and/or crystal powder to glass fibers.

3. The liquid cooled plate of claim 2 wherein said second insulating plate (102) is made of fiberglass or carbon fiber.

4. The liquid cooling plate of claim 1, further comprising a water nozzle (104), wherein the water nozzle (104) is in communication with the liquid flow conduit (103).

5. Liquid cooling plate according to claim 4, characterized in that the water nozzle (104) is provided with a water inlet and a water outlet, one end of the liquid flow duct (103) being connected with the water inlet and the other end of the liquid flow duct (103) being connected with the water outlet.

6. The liquid cooled plate of claim 1, wherein the liquid flow conduit (103) is metal.

7. The liquid cooled plate of claim 1, wherein the filler layer (105) is a composite material of epoxy resin with metal powder and/or crystal powder.

8. The liquid cooled plate of claim 1, wherein said first insulating plate (101), said second insulating plate (102), said liquid flow conduit (103) and said filler layer (105) are formed by compression molding or vacuum molding.

9. A battery pack, characterized in that the battery pack comprises a liquid-cooled plate according to any of claims 1-8.

10. An electric vehicle characterized by comprising the battery pack according to claim 9.