A new dual-loop liquid cooling PACK box

Abstract

The utility model relates to PACK box technical field discloses a novel double loop liquid cooling PACK box, including the bottom plate, the upper surface fixedly connected with the upper cover of bottom plate, the inside fixedly connected with battery module of upper cover, the upper surface of bottom plate is equipped with liquid cooling tank, the inside fixedly connected with the heat conduction plate of liquid cooling tank, the bottom surface left and right sides of liquid cooling tank are respectively equipped with heating serpentine groove and cooling serpentine groove in staggered shape, and the water inlet end and the water outlet end of heating serpentine groove and cooling serpentine groove all are fixedly connected with L type connecting pipe, and the outside fixedly connected with micro electromagnetic valve of L type connecting pipe. In the utility model, through the cooperation of the heat conduction plate, heating serpentine groove, cooling serpentine groove, L type connecting pipe, air pipe and micro electromagnetic valve that set up, can constitute the double loop passage for preheating and heat dissipation, and then when battery module needs to run and use in low temperature environment, the battery module is rapidly heated, makes it reach the suitable operating temperature quickly.

Description

Technical Field

[0001] This utility model relates to the field of PACK box technology, and in particular to a novel dual-circuit liquid-cooled PACK box. Background Technology

[0002] A PACK box, or battery pack, is a manufacturing process for lithium-ion batteries. A PACK refers to the combination of multiple lithium-ion individual cells connected in parallel and series. It takes into account issues such as system mechanical strength, thermal management, and BMS matching, and combines them into a battery pack that can be used directly. In order to avoid heat accumulation or hot spots inside the box, a liquid cooling structure is generally set up to assist in heat dissipation and improve heat dissipation efficiency.

[0003] A search revealed Chinese Patent Publication No. CN221727230U, which discloses a lithium battery disc-type liquid-cooled PACK box. This box includes vertically distributed liquid-cooling plates and disc-shaped liquid-cooling pipes. The vertically distributed liquid-cooling plates have maximum contact with the battery cells, increasing the contact area and improving heat dissipation. When liquid-cooled water enters the vertically distributed liquid-cooling pipes, gravity accelerates its circulation. Furthermore, the disc-shaped liquid-cooling pipes increase the heat exchange area between the liquid-cooling plates and the battery cells, further enhancing heat dissipation. Additionally, a temperature sensor monitors the temperature of the liquid-cooled water in real time.

[0004] In actual use, when the aforementioned PACK box is used in low-temperature weather, the internal chemical reaction rate of the battery slows down, the internal resistance increases, resulting in weakened discharge capacity, reduced vehicle mileage, poorer charging capacity, and longer charging time. At the same time, lithium plating is prone to occur when charging at low temperatures, which can damage the battery structure and shorten battery life. To address these issues, a novel dual-circuit liquid-cooled PACK box is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a novel dual-circuit liquid-cooled PACK box, which aims to improve the problem that the existing PACK box cannot preheat the battery module when used in a low-temperature environment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a novel dual-loop liquid-cooled PACK box, comprising a base plate, a top cover fixedly connected to the upper surface of the base plate, a battery module fixedly connected inside the top cover, a liquid-cooling tank formed on the upper surface of the base plate, a heat-conducting plate fixedly connected inside the liquid-cooling tank, a heating serpentine tank and a cooling serpentine tank respectively formed on the left and right sides of the bottom surface of the liquid-cooling tank in an alternating pattern, the water inlet and outlet of the heating serpentine tank and the cooling serpentine tank both penetrating the base plate, an L-shaped connecting pipe fixedly connected to the water inlet and outlet of the heating serpentine tank and the cooling serpentine tank, an air pipe fixedly connected to the upper surface of the L-shaped connecting pipe, and a miniature solenoid valve fixedly connected to the outer side of the L-shaped connecting pipe.

[0007] As a further description of the above technical solution:

[0008] The bottom surface of the heat-conducting plate is in contact with the bottom surface of the liquid cooling tank.

[0009] As a further description of the above technical solution:

[0010] The upper surface of the heat-conducting plate is in contact with the bottom surface of the battery module, and the heat-conducting plate is located directly below the battery module.

[0011] As a further description of the above technical solution:

[0012] The miniature solenoid valve is located between the outer end of the L-shaped connecting pipe, away from the base plate, and the air pipe.

[0013] As a further description of the above technical solution:

[0014] The trachea and the L-shaped connecting tube are internally interconnected.

[0015] As a further description of the above technical solution:

[0016] A support rod is fixedly connected to the upper surface of the base plate, and the upper end of the support rod is fixedly connected to an L-shaped connecting pipe.

[0017] As a further description of the above technical solution:

[0018] A rubber pad is fixedly connected to the inner top surface of the top cover, and the bottom surface of the rubber pad is in contact with the upper surface of the battery module.

[0019] As a further description of the above technical solution:

[0020] The rubber pad is designed with a honeycomb structure.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by combining the heat-conducting plate, heating serpentine groove, cooling serpentine groove, L-shaped connecting pipe, air pipe and miniature solenoid valve, a dual-loop channel for preheating and heat dissipation can be formed. Thus, when the battery module needs to be operated in a low-temperature environment, the battery module can be heated up quickly to reach the appropriate operating temperature. At the same time, when switching between preheating and heat dissipation is required, the liquid in the other loop can be quickly discharged to avoid affecting the efficiency of the corresponding preheating or heat dissipation.

[0023] 2. In this utility model, the support rod can support and limit the L-shaped connecting pipe, further improving its stability and reducing the risk of breakage. With the cooperation of the rubber pad, the mechanical stress generated by the battery module due to external vibration or internal cell expansion and contraction can be absorbed through elastic deformation, and rigid compression between the battery module and the top cover can be avoided. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a novel dual-loop liquid-cooled PACK box proposed in this utility model;

[0025] Figure 2 This is a schematic cross-sectional view of the front part of a novel dual-loop liquid-cooled PACK box proposed in this utility model.

[0026] Figure 3 This is a schematic diagram of the bottom plate of a novel dual-loop liquid-cooled PACK box proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the disassembled bottom plate of a novel dual-loop liquid-cooled PACK box proposed in this utility model.

[0028] Figure 5 This is a schematic diagram of the L-shaped connecting pipe of a novel dual-loop liquid-cooled PACK box proposed in this utility model.

[0029] Legend:

[0030] 1. Base plate; 2. Top cover; 3. Battery module; 4. Liquid cooling tank; 5. Heat conduction plate; 6. Heating serpentine channel; 7. Cooling serpentine channel; 8. L-shaped connecting pipe; 9. Air pipe; 10. Miniature solenoid valve; 11. Support rod; 12. Rubber pad. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-2 This utility model provides an embodiment of a novel dual-circuit liquid-cooled PACK box, including a base plate 1. A top cover 2 is fixedly connected to the upper surface of the base plate 1. A battery module 3 is located inside the top cover 2. The base plate 1 and the top cover 2 are connected and fixed by screws and rivet nuts, which can shield and protect the outside of the battery module 3. This is an existing technology in the field and will not be described in detail here. A liquid cooling tank 4 is formed on the upper surface of the base plate 1. A heat-conducting plate 5 is fixedly connected inside the liquid cooling tank 4. The heat-conducting plate 5 is made of aluminum alloy, which takes into account both strength and heat conduction. It can be anodized on the surface to enhance corrosion resistance. The bottom surface of the heat-conducting plate 5 is in contact with the bottom surface of the liquid cooling tank 4, and the upper surface of the heat-conducting plate 5 is in contact with the bottom surface of the battery module 3. The heat-conducting plate 5 is located directly below the battery module 3. When the battery module 3 is running, more of the heat generated can be transferred to the heat-conducting plate 5.

[0033] Reference Figures 3-5 The bottom surface of the liquid cooling tank 4 has staggered heating serpentine channels 6 and cooling serpentine channels 7 on its left and right sides. The heating serpentine channels 6 and cooling serpentine channels 7 are used to dissipate heat and preheat the battery module 3, respectively, forming a dual loop. The serpentine structure of the heating serpentine channels 6 and cooling serpentine channels 7 can prolong the flow time of the liquid at the bottom of the liquid cooling tank 4, improving the heat transfer effect. The inlet and outlet of the heating serpentine channels 6 and cooling serpentine channels 7 both penetrate the bottom plate 1 and the upper surface of the bottom plate 1. The inlet and outlet of the heating serpentine channels 6 and cooling serpentine channels 7 are fixedly connected to L-shaped connecting pipes 8. The liquid can enter the heating serpentine channel 6 or cooling serpentine channel 7 through the L-shaped connecting pipe 8 at the inlet end, and then be discharged through the L-shaped connecting pipe 8 at the outlet end, forming two complete loops. The L-shaped connecting pipe 8 can be connected to an external heat pump or cooling water tank through a pipe. A circulation pump is set on the outside of the pipe, which can make the liquid circulate, thereby improving the heat transfer efficiency.

[0034] Air pipes 9 are fixedly connected to the upper surface of the L-shaped connecting pipe 8. The air pipes 9 and the interior of the L-shaped connecting pipe 8 are interconnected. The air pipe 9 at the water inlet end can be connected to an air pump through a pipe, while the air pipe 9 at the water outlet end can be directly connected to a heat pump or a cooling water tank through a pipe. After the airflow enters the circuit through the air pipe 9 of the water inlet pipe, it can squeeze out the liquid inside the circuit, so that the liquid returns to the corresponding heat pump or cooling water tank, which is convenient for recycling and can avoid affecting the subsequent preheating or heat dissipation conversion. A miniature solenoid valve 10 is fixedly connected to the outside of the L-shaped connecting pipe 8. The miniature solenoid valve 10 is located between the end of the L-shaped connecting pipe 8 away from the base plate 1 and the air pipe 9. The miniature solenoid valve 10 can control the opening and closing of the L-shaped connecting pipe 8.

[0035] Reference Figure 2 and Figure 5 A support rod 11 is fixedly connected to the upper surface of the base plate 1. The upper end of the support rod 11 is fixedly connected to the L-shaped connecting pipe 8. The support rod 11 can support and limit the L-shaped connecting pipe 8, further improving the stability of the L-shaped connecting pipe 8 and reducing the risk of breakage at the connection between the L-shaped connecting pipe 8 and the base plate 1. A rubber pad 12 is fixedly connected to the inner top surface of the top cover 2. The bottom surface of the rubber pad 12 is in contact with the upper surface of the battery module 3. The rubber pad 12 adopts a honeycomb structure and is located between the battery module 3 and the top cover 2. It absorbs the mechanical stress generated by the battery module 3 due to external vibration (such as vehicle driving or equipment operation) or the expansion and contraction of the internal cells through elastic deformation. At the same time, the honeycomb structure provides porous elastic support, disperses local pressure, and avoids uneven stress on the surface of the battery module 3.

[0036] The tight fit between the rubber pad 12 and the upper surface of the battery module 3 forms a flexible constraint, preventing the battery module 3 from shifting due to impact or tilting within the PACK box. Furthermore, during battery charging and discharging, the battery cells expand and contract due to temperature changes, and the honeycomb rubber pad 12 absorbs the expansion force through elastic deformation, preventing rigid compression between the battery module 3 and the top cover 2.

[0037] Working principle: When installing the PACK box, the rubber pad 12 will fit tightly against the upper surface of the battery module 3. Through elastic deformation, it absorbs the mechanical stress generated by external vibration or internal cell expansion and contraction of the battery module 3, and avoids squeezing between the battery module 3 and the top cover 2. When the battery module 3 needs to be used in a low-temperature environment, the heat pump and the corresponding circulation pump can be started, so that the preheating liquid can enter the heating serpentine 6 through the L-shaped connecting pipe 8 corresponding to the heating serpentine 6. The heat is transferred to the battery module 3 through the heat conduction plate 5. With the self-heating of the battery module 3, the temperature rises quickly, so that the battery module 3 can quickly reach the appropriate operating temperature and improve the efficiency of use. After the preheating is completed, the micro solenoid valves 10 at the two corresponding L-shaped connecting pipes 8 are closed, and the corresponding air pump is started to introduce air into the heating serpentine 6 through the air pipe 9 at the water inlet end. This quickly squeezes the preheating liquid in the heating serpentine 6 back into the heat pump, so as to avoid affecting the subsequent heat dissipation efficiency.

[0038] Next, when the temperature of battery module 3 rises and heat dissipation is required, the cooling water tank and the corresponding circulation pump can be started, so that the coolant enters the cooling serpentine tank 7 and circulates. The heat generated by battery module 3 is quickly removed through the heat conduction plate 5, reducing the temperature of battery module 3 and thus improving the operating efficiency of battery module 3. After the heat dissipation is completed, when the next round of preheating is required, the coolant can be discharged through the corresponding air pump. The structure is simple and the operation is convenient.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel dual-loop liquid-cooled PACK box, comprising a base plate (1), characterized in that: A top cover (2) is fixedly connected to the upper surface of the base plate (1). A battery module (3) is fixedly connected inside the top cover (2). A liquid cooling tank (4) is opened on the upper surface of the base plate (1). A heat-conducting plate (5) is fixedly connected inside the liquid cooling tank (4). A heating serpentine tank (6) and a cooling serpentine tank (7) are respectively opened on the left and right sides of the bottom surface of the liquid cooling tank (4) in an alternating pattern. The water inlet and outlet of the heating serpentine tank (6) and the cooling serpentine tank (7) both penetrate the base plate (1). The water inlet and outlet of the heating serpentine tank (6) and the cooling serpentine tank (7) are both fixedly connected to L-shaped connecting pipes (8). An air pipe (9) is fixedly connected to the upper surface of the L-shaped connecting pipe (8). A miniature solenoid valve (10) is fixedly connected to the outside of the L-shaped connecting pipe (8).

2. The novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: The bottom surface of the heat-conducting plate (5) is in contact with the bottom surface of the liquid cooling tank (4).

3. The novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: The upper surface of the heat-conducting plate (5) is in contact with the bottom surface of the battery module (3), and the heat-conducting plate (5) is located directly below the battery module (3).

4. A novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: The miniature solenoid valve (10) is located between the end of the L-shaped connecting pipe (8) away from the base plate (1) and the air pipe (9).

5. A novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: The trachea (9) and the L-shaped connecting pipe (8) are internally interconnected.

6. A novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: A support rod (11) is fixedly connected to the upper surface of the base plate (1), and the upper end of the support rod (11) is fixedly connected to the L-shaped connecting pipe (8).

7. A novel dual-loop liquid-cooled PACK box according to claim 1, characterized in that: A rubber pad (12) is fixedly connected to the inner top surface of the top cover (2), and the bottom surface of the rubber pad (12) is in contact with the upper surface of the battery module (3).

8. A novel dual-loop liquid-cooled PACK box according to claim 7, characterized in that: The rubber pad (12) is configured with a honeycomb structure.

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