Power battery system supporting 800V high voltage

Abstract

The utility model relates to the technical field of power batteries, in particular to a power battery system supporting 800V high voltage, which comprises a box body, a plurality of battery modules are arranged in the box body in parallel, the bottoms of the battery modules are fixedly connected with the box body, liquid cooling plates are arranged on two sides of each battery module, and the liquid cooling plates are fixedly connected with the box body. The liquid cooling plate is directly attached and fixedly connected with the side surface of the battery module, and one side, far away from the battery module, of the liquid cooling plate is an insulating surface. According to the liquid cooling plate, one side, far away from the battery module, of the liquid cooling plate is the insulating surface, so that the liquid cooling plate can be directly attached to the side surface of the battery module, the heat exchange efficiency of the liquid cooling plate is improved, the manufacturing process of the liquid cooling plate is simplified, and the cost of the liquid cooling plate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a power battery system supporting 800V high voltage. Background Art

[0002] Currently, the 800V high-voltage power battery system, a new milestone in electric vehicle technology, significantly improves charging efficiency and overall vehicle energy efficiency by increasing system voltage. This technology primarily serves the next generation of pure electric vehicles (BEVs), significantly reducing current losses during transmission and supporting high-rate fast charging. However, high-voltage charging technology involves high voltages and places extremely high demands on the structure's withstand voltage, insulation, and heat dissipation performance, resulting in high manufacturing costs and complex processes for power battery systems.

[0003] The Chinese invention patent application with application publication number CN109524588A discloses a modular liquid-cooled battery module, which fixes multiple battery cells through aluminum guard plates and steel strips at both ends, and arranges liquid cooling plates on both sides of the module. The two ends of the liquid cooling plate are connected to the aluminum guard plates, and a second insulating sheet is arranged between the aluminum guard plates and the battery cells. A third insulating sheet is arranged between the liquid cooling plate and the battery cells. The modular liquid-cooled battery module ensures the insulation of the battery module through the second insulating sheet and the third insulating sheet, but the third insulating sheet increases the distance between the liquid cooling plate and the battery cells, which will affect the heat exchange efficiency of the liquid cooling plate, making the heat dissipation pressure of the 800V high-voltage power battery system greater. Utility Model Content

[0004] The purpose of this utility model is to address the defects of the existing technology and provide a power battery system that supports 800V high voltage, which is beneficial to improve the heat exchange efficiency of the liquid cooling plate, simplify the liquid cooling plate manufacturing process, and reduce the cost of the liquid cooling plate.

[0005] In order to solve the above technical problems, the utility model provides a power battery system that supports 800V high voltage, including a box body, in which multiple battery modules are arranged in parallel, the bottom of the battery module is fixedly connected to the box body, and liquid cooling plates are provided on both sides of the battery module. The liquid cooling plates are directly fitted and fixedly connected to the side surfaces of the battery module, and the side of the liquid cooling plate away from the battery module is an insulating surface.

[0006] In some embodiments, thermal insulation cotton is provided on the side of the liquid cooling plate away from the battery module.

[0007] Furthermore, the two liquid cooling plates between two adjacent battery modules share a thermal insulation cotton.

[0008] In some embodiments, the bottom of the liquid cooling plate is fixedly connected to the box via foamed silicone.

[0009] In some embodiments, the liquid cooling plate includes a bonding plate and an insulating plate arranged in parallel, a flow channel is provided on the insulating plate, and the bonding plate is bonded to the side surface of the battery module.

[0010] Furthermore, a liquid inlet and a liquid outlet are provided on the insulating plate, and the liquid inlet and the liquid outlet are respectively close to two ends of the insulating plate.

[0011] Furthermore, a glue groove is provided on one side edge of the laminating plate close to the insulating plate, a sealant is provided in the glue groove, and the laminating plate and the insulating plate are connected by the sealant.

[0012] Furthermore, the insulating board comprises a composite plastic board.

[0013] In some embodiments, the bottom of the battery module is fixedly connected to the box body by a thermally conductive structural adhesive.

[0014] In some embodiments, mounting beams are fixedly provided on both sides of the box.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model sets the side of the liquid cooling plate away from the battery module as an insulating surface, so that the liquid cooling plate can be directly attached to the side of the battery module, which is beneficial to improving the heat exchange efficiency of the liquid cooling plate.

[0017] 2. The utility model can further improve the heat exchange efficiency of the liquid cooling plate by providing thermal insulation cotton.

[0018] 3. The liquid cooling plate of the present invention is fixedly connected to the side of the battery module, and the bottom of the liquid cooling plate is fixedly connected to the box body through foamed silicone. The foamed silicone has the characteristics of high elasticity and softness. It can not only fix the liquid cooling plate and the battery module to the bottom of the box body, but also serve as a buffer layer between the battery module, the liquid cooling plate and the box body.

[0019] 4. The liquid cooling plate of the present invention includes a laminated plate and an insulating plate. The liquid cooling plate itself has insulation capabilities and does not require an additional insulating structure, making the structure of the power battery system simpler.

[0020] 5. The liquid cooling plate of the present invention is different from the existing technology. The liquid cooling plate in the existing technology often adopts stamping, brazing, and profile extrusion cold plates, which are expensive and complex in process. In the liquid cooling plate of the present invention, the bonding plate is directly bonded to the insulating plate by opening a glue groove, which simplifies the process.

[0021] 6. The insulation plate of the present invention adopts a composite plastic plate. Compared with the aluminum plate in the prior art, it has certain mechanical strength and high pressure insulation performance, strong thermal insulation ability, reduces the heat exchange between the cooling medium and the outside world, and is conducive to improving the heat exchange efficiency of the liquid cooling plate. In addition, the cost is also lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the liquid cooling plate of the present invention.

[0024] Figure numerals: 1-box; 2-upper cover; 3-battery module; 4-liquid cooling plate; 41-bonding plate; 42-insulating plate; 43-glue groove; 44-liquid inlet; 45-liquid outlet; 5-foamed silica gel; 6-thermal insulation cotton; 7-mounting beam. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0026] like Figure 1 As shown, the utility model provides a power battery system supporting 800V high voltage, including a box body 1 and an upper cover 2, the upper cover 2 is sealed and fixedly arranged at the bottom of the box body 1, a plurality of battery modules 3 are arranged in parallel in the box body 1, the bottom of the battery module 3 is fixedly connected to the box body 1, and liquid cooling plates 4 are arranged on both sides of the battery module 3, that is, the liquid cooling plates 4 are arranged parallel to the length direction of the battery module 3, the liquid cooling plates 4 are directly fitted and fixedly connected to the side of the battery module 3, and the side of the liquid cooling plate 4 away from the battery module 3 is an insulating surface.

[0027] Compared with the prior art, the present invention does not require an insulating structure between the liquid cooling plate 4 and the battery module 3. By setting the side of the liquid cooling plate 4 away from the battery module 3 as an insulating surface, the liquid cooling plate 4 can be directly attached to the side of the battery module 3, which is beneficial to improving the heat exchange efficiency of the liquid cooling plate 4.

[0028] In some embodiments, thermal insulation cotton 6 is provided on the side of the liquid cooling plate 4 away from the battery module 3. The thermal insulation cotton 6 completely covers the side of the liquid cooling plate 4, reducing the heat exchange between the liquid cooling plate 4 and the outside world, and can further improve the heat exchange efficiency of the liquid cooling plate 4.

[0029] Furthermore, the two liquid cooling plates 4 between two adjacent battery modules 3 share a thermal insulation cotton 6 .

[0030] In some embodiments, the bottom of the liquid cooling plate 4 is fixedly connected to the box body 1 through the foamed silicone 5. The foamed silicone 5 has the characteristics of high elasticity and softness. Since the liquid cooling plate 4 is fixedly connected to the battery module 3, the foamed silicone 5 can not only fix the liquid cooling plate 4 and the battery module 3 at the bottom of the box body 1, but also serve as a buffer layer between the battery module 3 and the liquid cooling plate 4 and the box body 1.

[0031] In some embodiments, the liquid cooling plate 4 includes a parallel laminating plate 41 and an insulating plate 42. The insulating plate 42 has a flow channel, and the laminating plate 41 is in contact with the side of the battery module 3. The insulating plate 42 is located on the side of the liquid cooling plate 4 away from the battery module 3, which provides the liquid cooling plate 4 with inherent insulation capabilities. This eliminates the need for additional insulation on the side of the liquid cooling plate 4 away from the battery module 3, simplifying the structure of the power battery system.

[0032] In addition, existing stamping, brazing, and profile extrusion cold plates may be used, and an insulating layer may be provided on the side of the cold plate away from the battery module 3 .

[0033] Furthermore, a liquid inlet 44 and a liquid outlet 45 are formed on the insulating plate 42 , and the liquid inlet 44 and the liquid outlet 45 are respectively close to two ends of the insulating plate 42 .

[0034] Furthermore, a glue groove 43 is formed on one side edge of the laminating plate 41 close to the insulating plate 42 , and a sealant is provided in the glue groove 43 , and the laminating plate 41 and the insulating plate 42 are connected by the sealant.

[0035] The laminating plate 41 can be cut and formed from AL-3003 material, with a 2mm-wide adhesive groove 43 milled on its surface. This liquid cooling plate 4 differs from existing technologies, which often use stamping, brazing, or extrusion, resulting in high costs and complex processes. In this liquid cooling plate 4, the laminating plate 41 is directly bonded to the insulating plate 42 via the adhesive groove 43, simplifying the process.

[0036] Furthermore, the insulating plate 42 comprises a composite plastic plate. The insulating plate 42 should possess a certain mechanical strength and high-voltage insulation performance. The insulating plate 42 can be formed from a mixture of PC and fiberglass materials, enabling it to withstand a burst pressure of 250 kPa. PC and fiberglass are lower in cost than aluminum and offer greater thermal insulation, which helps reduce heat exchange between the cooling medium and the outside world, further improving the heat exchange efficiency of the liquid cooling plate 4.

[0037] Furthermore, the bottom of the battery module 3 is fixedly connected to the box body 1 by means of a heat-conducting structural adhesive.

[0038] Furthermore, mounting beams 7 are fixedly provided on both sides of the box body 1 .

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power battery system supporting 800V high voltage, characterized by: The invention comprises a box body (1), wherein a plurality of battery modules (3) are arranged in parallel in the box body (1), the bottom of the battery module (3) is fixedly connected to the box body (1), and liquid cooling plates (4) are arranged on both sides of the battery module (3), the liquid cooling plates (4) are directly attached and fixedly connected to the side surfaces of the battery module (3), and the side of the liquid cooling plate (4) away from the battery module (3) is an insulating surface.

2. The 800V high-voltage power battery system according to claim 1, characterized in that: A heat-insulating cotton (6) is provided on the side of the liquid cooling plate (4) away from the battery module (3).

3. The 800V high-voltage power battery system according to claim 2, characterized in that: The two liquid cooling plates (4) between two adjacent battery modules (3) share a common thermal insulation cotton (6).

4. The 800V high-voltage power battery system according to claim 1, characterized in that: The bottom of the liquid cooling plate (4) is fixedly connected to the box (1) via foamed silica gel (5).

5. The power battery system supporting 800V high voltage according to any one of claims 1 to 4, characterized in that: The liquid cooling plate (4) comprises a laminating plate (41) and an insulating plate (42) arranged in parallel, a flow channel is provided on the insulating plate (42), and the laminating plate (41) is laminating to the side surface of the battery module (3).

6. The 800V high-voltage power battery system according to claim 5, characterized in that: A liquid inlet (44) and a liquid outlet (45) are provided on the insulating plate (42), and the liquid inlet (44) and the liquid outlet (45) are respectively close to two ends of the insulating plate (42).

7. The power battery system supporting 800V high voltage according to claim 5, characterized in that: A glue groove (43) is provided on one side edge of the laminating plate (41) close to the insulating plate (42), and a sealant is provided in the glue groove (43). The laminating plate (41) and the insulating plate (42) are connected via the sealant.

8. The power battery system supporting 800V high voltage according to claim 7, characterized in that: The insulating plate (42) comprises a composite plastic plate.

9. The power battery system supporting 800V high voltage according to any one of claims 1 to 4, characterized in that: The bottom of the battery module (3) is fixedly connected to the box (1) via a heat-conducting structural adhesive.

10. The power battery system supporting 800V high voltage according to any one of claims 1 to 4, characterized in that: Mounting beams (7) are fixedly arranged on both sides of the box body (1).

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