Liquid-cooled power battery box and power battery

Abstract

The utility model belongs to the technical field of heat dissipation of power batteries, and particularly relates to a liquid-cooled power battery box and a power battery. Comprising a box body and a battery module arranged in an inner cavity of the box body, the box body comprises a box body bottom plate and a box body side wall vertically arranged on the box body bottom plate, and the box body side wall is of a double-layer structure; and the liquid cooling module is arranged in an interlayer between the double-layer structures. According to the scheme, the side wall of the battery box body is arranged to be of the double-layer structure, the liquid cooling assembly is arranged in the interlayer between the double-layer structure to dissipate heat of the battery module, and the liquid cooling assembly is arranged in the interlayer of the side wall of the box body and can be isolated from the battery module in the box body, so that the safety of the battery module is ensured, and meanwhile, the liquid cooling assembly is arranged in the interlayer of the side wall of the box body. The liquid cooling assembly can perform large-area heat exchange with the battery module, so that the consistency of the battery temperature is kept, the temperature difference in the battery box body is reduced, the heat dissipation efficiency of the battery box is greatly improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of power battery heat dissipation, and particularly relates to a liquid-cooled power battery box and a power battery. Background Art

[0002] As the demand for power batteries becomes higher and higher: they must meet the requirements of long battery life and high-rate charge and discharge, the battery generates more heat during use, which will shorten the battery life. In view of the above situation, higher requirements are also placed on the heat dissipation design of the battery box. At present, the industry generally adopts the method of installing a liquid cooling plate on the bottom plate of the battery box. The liquid cooling effect of this design is not efficient because the main heating surface of the battery is the large side surface, and the surface in contact with the liquid cooling plate in the box is the bottom surface of the battery.

[0003] In the prior art, in the disclosed liquid-cooled battery box structure, the liquid cooling components are mostly arranged on the bottom surface of the battery or on the battery box cover. The above method can only dissipate heat on the bottom surface of the battery or the top of the battery. Both of the above solutions have the problem that the heat dissipation surface is too small and the heat dissipation effect is poor. In other battery structures, a liquid cooling plate is installed between the batteries in the battery box. This solution increases the overall size and weight of the battery box, and has many parts. Once leakage occurs, the battery is in danger of being immersed in water. The safety and convenience of this solution are relatively low. Utility Model Content

[0004] The purpose of the utility model is to provide a liquid-cooled power battery box to address the technical defects in the prior art that the position where the liquid cooling component is installed in the battery box has poor heat dissipation effect or poor safety.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A liquid-cooled power battery box comprises a box body, wherein the interior of the box body is a cavity for accommodating a battery module.

[0007] The box body includes a box body bottom plate and a box body side wall vertically arranged on the box body bottom plate, and the box body side wall is a double-layer structure; and also includes a liquid cooling component, and the liquid cooling component is arranged in the interlayer between the double-layer structure.

[0008] In the technical solution of the present invention, the side wall of the battery box is set as a double-layer structure, and the liquid cooling component is set in the interlayer between the double-layer structure. The liquid cooling component surrounds the battery module to dissipate heat for the battery module. The liquid cooling component is set in the interlayer of the side wall of the box, and can be isolated from the battery module inside the box, thereby ensuring the safety of the battery module. Compared with the design method of setting the liquid cooling component on the top cover or the bottom plate in the prior art, in the technical solution of the present application, the liquid cooling component is distributed around the box, which increases the contact area with the battery module, realizes large-area heat exchange with the battery module, maintains the consistency of the battery temperature, reduces the temperature difference in the battery box, greatly improves the heat dissipation efficiency of the battery box, and extends the battery life.

[0009] As a preferred technical solution of the present utility model, the side wall of the box body is an integrally formed structure.

[0010] Preferably, the box body side wall includes an inner side wall and an outer side wall, the inner side wall is a side close to the battery module, the inner side wall has a generally rectangular cross section, and the outer side wall has a generally rectangular cross section.

[0011] Preferably, the horizontal distance between the inner wall and the outer wall is 1.5-2.5 cm.

[0012] Preferably, the liquid cooling assembly includes a liquid cooling pipe, which is integrally formed in the side wall of the box body. The liquid cooling pipe includes a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are located on the same side wall of the box body to facilitate connection with the liquid cooling box.

[0013] Preferably, the liquid cooling assembly further includes a first cooling joint and a second cooling joint, the liquid inlet is connected to the first cooling joint, the liquid outlet is connected to the second cooling joint, and the first cooling joint and the second cooling joint are respectively fixedly connected to the side walls of the box body.

[0014] More specifically, the first cooling joint and the second cooling joint are respectively arranged on the side wall of the box body close to the bottom plate of the box body.

[0015] The first cooling joint is arranged through the side wall of the box body, one side of the first cooling joint is located on the inner side wall, and the other side of the first cooling joint is located on the outer side wall. The first cooling joint and the second cooling joint are used to connect with the liquid cooling box.

[0016] The liquid inlet and the liquid outlet are located at the same position of the side wall of the box body, which facilitates the laying of pipes that connect the first cooling joint and the second cooling joint to the liquid cooling box respectively.

[0017] Preferably, the liquid cooling pipe is wavy or zigzag in the side wall of the box body, so that the liquid cooling medium can fill the cavity of the liquid cooling pipe as much as possible, and the heat exchange with the battery module can be increased as much as possible.

[0018] Preferably, the length of the liquid cooling pipe is 3-5 times the circumference of the cross-section of the side wall of the box body.

[0019] Preferably, the inner diameter of the liquid cooling pipe is 1-2 cm.

[0020] Preferably, the liquid cooling pipe is made of stainless steel.

[0021] Preferably, the liquid cooling medium in the liquid cooling pipe includes any one of water and ethylene glycol solution.

[0022] A power battery comprises the above-mentioned liquid-cooled power battery box.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0024] In the technical solution of the present invention, the side wall of the battery box is set as a double-layer structure, and the liquid cooling component is set in the interlayer between the double-layer structure. The liquid cooling component surrounds the battery module to dissipate heat for the battery module. The liquid cooling component is set in the interlayer of the side wall of the box, and can be isolated from the battery module inside the box, thereby ensuring the safety of the battery module. Compared with the design method of setting the liquid cooling component on the top cover or the bottom plate in the prior art, in the technical solution of the present application, the liquid cooling component is distributed around the box, which increases the contact area with the battery module, realizes large-area heat exchange with the battery module, maintains the consistency of the battery temperature, reduces the temperature difference in the battery box, greatly improves the heat dissipation efficiency of the battery box, and extends the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the side wall interlayer of the box body of the utility model;

[0026] Figure 2 It is a schematic diagram of the liquid cooling pipeline from the top perspective of the box body of the utility model;

[0027] Figure 3 It is a schematic diagram of the external structure of the liquid-cooled power battery box of the utility model;

[0028] Icons: 1-box bottom plate; 2-box side wall; 21-inner wall; 22-outer wall; 3-liquid cooling pipe; 31-liquid inlet; 32-liquid outlet; 4-first cooling joint; 5-second cooling joint. DETAILED DESCRIPTION

[0029] In order to more clearly describe the invention purpose, technical scheme and technical effect advantages in the specific implementation cases of the utility model, the scheme in the specific embodiment will be described in detail in combination with the drawings of the specification of the utility model. The specific technical scheme involved in the following specific embodiments is only for a clear and complete description of the innovative technical scheme of the utility model. It is only a part of the specific implementation scheme that can be adopted by the utility model, not all embodiments, and should not be understood as a limitation on the innovative scheme of the utility model. Any scheme that adopts the same inventive concept of the utility model should be included in the protection scope of the utility model.

[0030] The utility model is described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] Example 1

[0033] This embodiment discloses a liquid-cooled power battery box, such as Figure 1-3 As shown, it includes a box body, the interior of the box body is a cavity for accommodating the battery module, the box body includes a box body bottom plate 1 and a box body side wall 2 vertically arranged on the box body bottom plate 1, the box body side wall 2 is a double-layer structure, and also includes a liquid cooling component, and the liquid cooling component is arranged in the interlayer between the double-layer structure; specifically, the box body side wall 2 is an integrally formed structure. The box body side wall 2 includes an inner side wall 21 and an outer side wall 22, and the inner side wall 21 is a side close to the battery module. The horizontal spacing between the inner side wall 21 and the outer side wall 22, that is, the width of the interlayer is 1.5-2.5cm. In this embodiment, the width of the interlayer is 2cm.

[0034] As a more preferred solution, the liquid cooling component includes a liquid cooling pipe 3, the liquid cooling pipe 3 is integrally formed in the box side wall 2, the liquid cooling pipe 3 includes a liquid inlet 31 and a liquid outlet 32, the liquid inlet and the liquid outlet are located on the same box side wall 2. The liquid cooling component also includes a first cooling joint 4 and a second cooling joint 5, the liquid inlet is connected to the first cooling joint 4, the liquid outlet is connected to the second cooling joint 5, and the first cooling joint 4 and the second cooling joint 5 are respectively fixedly connected to the box side wall 2.

[0035] As a preferred solution, the first cooling joint 4 and the second cooling joint 5 are respectively arranged at positions of the box side wall 2 close to the box bottom plate 1. Figure 3Specifically, the first cooling joint 4 is arranged through the box side wall 2, one side of the first cooling joint 4 is located at the inner side wall 21, and the other side of the first cooling joint 4 is located at the outer side wall 22. The first cooling joint 4 and the second cooling joint 5 are used to connect with the liquid cooling box.

[0036] The liquid inlet and the liquid outlet are located at the same position of the box side wall 2, which facilitates the laying of pipes connecting the first cooling joint 4 and the second cooling joint 5 to the liquid cooling box respectively.

[0037] As a more preferred solution, the liquid cooling pipe 3 is laid in the box side wall 2 in a wavy or zigzag shape. The liquid cooling medium can fill the cavity of the liquid cooling pipe 3 as much as possible, and the heat exchange with the battery module can be increased as much as possible. In a preferred solution, the length of the liquid cooling pipe 3 is 5 times the circumference of the box side wall 2. In this embodiment, the circumference of the box side wall 2 is 1.9m; ​​the length of the liquid cooling pipe 3 is 6.5m.

[0038] In this embodiment, the inner diameter of the liquid cooling pipe 3 is 1.8 cm, and the liquid cooling pipe 3 is made of stainless steel; the liquid cooling medium in the liquid cooling pipe 3 can be water or ethylene glycol solution.

[0039] Example 2

[0040] This embodiment discloses a power battery, including the liquid-cooled power battery box disclosed in Embodiment 1, wherein a battery module is arranged inside the battery box.

[0041] In the technical solution of the above embodiment, the side wall of the battery box is set as a double-layer structure, and the liquid cooling component is set in the interlayer between the double-layer structure. The liquid cooling component surrounds the battery module to dissipate heat for the battery module. The liquid cooling component is set in the interlayer of the side wall of the box, and can be isolated from the battery module inside the box, thereby ensuring the safety of the battery module. Compared with the design method of setting the liquid cooling component on the top cover or the bottom plate in the prior art, in the technical solution of the present application, the liquid cooling component is distributed around the box, which increases the contact area with the battery module, realizes large-area heat exchange with the battery module, maintains the consistency of the battery temperature, reduces the temperature difference in the battery box, greatly improves the heat dissipation efficiency of the battery box, and extends the battery life.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled power battery box, characterized in that: The invention comprises a box body, wherein the interior of the box body is a cavity for accommodating a battery module, the box body comprises a box body bottom plate (1) and a box body side wall (2) vertically arranged on the box body bottom plate (1), the box body side wall (2) is a double-layer structure, and further comprises a liquid cooling component, wherein the liquid cooling component is arranged in the interlayer between the double-layer structure; the box body side wall (2) is an integrally formed structure; the liquid cooling component comprises a liquid cooling pipe (3), wherein the liquid cooling pipe (3) is integrally formed in the box body side wall (2), and the liquid cooling pipe (3) comprises a liquid inlet (31) and a liquid outlet (32); the liquid cooling pipe (3) is wavy or zigzag in the box body side wall (2); and the length of the liquid cooling pipe (3) is 3-5 times the circumference of the cross section of the box body side wall (2).

2. The liquid-cooled power battery box according to claim 1, characterized in that: The liquid cooling assembly further comprises a first cooling joint (4) and a second cooling joint (5), the liquid inlet (31) being in communication with the first cooling joint (4), the liquid outlet (32) being in communication with the second cooling joint (5), and the first cooling joint (4) and the second cooling joint (5) being respectively fixedly connected to the side wall (2) of the box body.

3. The liquid-cooled power battery box according to claim 2, characterized in that: The inner diameter of the liquid cooling pipe (3) is 1-2 cm.

4. The liquid-cooled power battery box according to claim 3, characterized in that: The liquid cooling pipe (3) is made of stainless steel.

5. The liquid-cooled power battery box according to claim 2, characterized in that: The box side wall (2) comprises an inner wall (21) and an outer wall (22), wherein the inner wall (21) is a side close to the battery module, and a horizontal distance between the inner wall (21) and the outer wall (22) is 1.5-2.5 cm.

6. A power battery, characterized in that: A liquid-cooled power battery box comprising any one of claims 1 to 5, wherein a battery module is arranged inside the battery box.

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