Battery thermal management system based on reverse flow type liquid cooling plate

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery thermal management system based on a reverse flow type liquid cooling plate, which is arranged at the bottom of a battery cell module and comprises a liquid cooling plate assembly, a temperature sensing system and a reversing controller, the temperature sensing system is arranged on the liquid cooling plate assembly and is used for monitoring the temperature difference of a cooling liquid inlet and a cooling liquid outlet; the reversing controller is connected with the liquid cooling plate assembly, the reversing controller is used for controlling the flowing direction of cooling liquid in the liquid cooling plate assembly, and the temperature sensing system is in electric signal connection with the reversing controller and is used for sending an instruction to enable the reversing controller to control reversing flowing of the cooling liquid. By arranging the temperature sensing system and the reversing controller, the bidirectional flow of the cooling liquid in the liquid cooling plate can be realized, the temperature difference between the front and back of the flow channel is reduced through reciprocating flow, and the temperature consistency of the battery cell is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery thermal management system based on a countercurrent liquid cooling plate. Background Art

[0002] With the rapid development of new energy vehicles, the temperature environment of each battery cell in the battery pack during the entire life cycle is one of the most critical external factors affecting the life. Currently, the market demand for high-rate fast charging of battery cells is gradually increasing, which will cause the battery to generate a large amount of heat. If no cooling measures are taken, it will lead to an increase in the temperature of the battery cells, thereby generating risks. Therefore, how to make each battery cell work in a suitable temperature environment has become a thermal management technical problem that needs to be solved by technicians in this industry. Content of the Utility Model

[0003] In view of the above problems, the utility model proposes a battery thermal management system based on a countercurrent liquid cooling plate, which is arranged at the bottom of the battery cell module and includes a liquid cooling plate assembly, a temperature sensing system and a commutation controller. The temperature sensing system is arranged on the liquid cooling plate assembly and is used to monitor the temperature difference between the inlet and outlet of the coolant. The commutation controller is connected to the liquid cooling plate assembly, and the commutation controller is used to control the flow direction of the coolant in the liquid cooling plate assembly. The temperature sensing system is electrically connected to the commutation controller and is used to send an instruction to make the commutation controller control the commutation flow of the coolant.

[0004] Further, the liquid cooling plate assembly includes a liquid cooling plate, a liquid cooling plate inlet pipe and a liquid cooling plate outlet pipe. The liquid cooling plate is arranged at the bottom of the battery cell module. One end of the liquid cooling plate inlet pipe is connected to the commutation controller, and the other end is connected to the liquid cooling plate. One end of the liquid cooling plate outlet pipe is connected to the commutation controller, and the other end is connected to the liquid cooling plate.

[0005] Further, the liquid cooling plate is provided with a coolant flow channel, and the coolant flow channel is provided with a coolant inlet and a coolant outlet. The liquid cooling plate inlet pipe is connected to the coolant inlet on the coolant flow channel, and the liquid cooling plate outlet pipe is connected to the coolant outlet on the coolant flow channel.

[0006] Further, the temperature sensing system includes a first temperature sensor and a second temperature sensor. The first temperature sensor is arranged on the liquid cooling plate inlet pipe, and the second temperature sensor is arranged on the liquid cooling plate outlet pipe.

[0007] Further, the commutation controller includes a flow direction control valve, and the flow direction control valve is arranged in the commutation controller to control the flow direction of the coolant in the liquid cooling plate.

[0008] Further, the coolant flow channel is a series-connected S-shaped flow channel.

[0009] Further, it further includes a second liquid cooling plate assembly, and the second liquid cooling plate assembly is arranged on the top of the battery cell module.

[0010] Further, the coolant adopts a 50% ethylene glycol aqueous solution.

[0011] Further, the bottom of the battery cell module is in contact with the liquid cooling plate through a thermal conductive adhesive or a thermal conductive structural adhesive, and the top of the battery cell module is in contact with the air.

[0012] Further, the material of the liquid cooling plate is AL3003.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows:

[0014] 1. By setting a temperature sensing system and a commutation controller, the present application can realize the bidirectional flow of the coolant in the liquid cooling plate. When the temperature sensing system detects that the temperature difference between the inlet and the outlet reaches 3°C, the commutation controller can control the coolant to flow forward and backward repeatedly in the liquid cooling plate, forming a reciprocating flow. When the coolant flows forward, the temperature of the battery cells at the front end of the liquid cooling plate is low, and the temperature of the battery cells at the rear end is high; when the coolant flows backward, the temperature of the battery cells at the rear end of the liquid cooling plate is low, and the temperature of the battery cells at the front end is high. By the reciprocating flow, the temperature difference between the front and the rear of the flow channel is reduced, ensuring the consistency of the battery cell temperature.

[0015] 2. This system uses a flow direction control valve to realize the reciprocating commutation flow of the system. The structure is compact, and it can provide stable and reliable valve operation in a smaller space, effectively reducing the complexity of the system.

[0016] 3. Through the design of the commutation system of the series liquid cooling plate, under different working conditions, the situation of excessive temperature difference of the battery cells can be effectively reduced by adjusting the time of the commutation period, and the service life of the battery cells is extended.

[0017] Other features and advantages of the present utility model will be described in the subsequent description, and part of them will be obvious from the description, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the description, the claims and the drawings. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1Shows a schematic diagram of the battery thermal management system of the countercurrent liquid cooling plate in the embodiment of the present utility model;

[0020] Figure 2 Shows a schematic diagram of the structure of the liquid cooling plate in the embodiment of the present utility model;

[0021] Figure 3 Shows a schematic diagram of the forward flow of the commutation controller in the embodiment of the present utility model;

[0022] Figure 4 Shows a schematic diagram of the reverse flow of the commutation controller in the embodiment of the present utility model.

[0023] In the figure, 1 is the battery cell module; 2 is the liquid cooling plate assembly; 21 is the liquid cooling plate; 22 is the liquid cooling plate inlet pipe; 23 is the liquid cooling plate outlet pipe; 24 is the coolant flow channel; 3 is the temperature sensing system; 31 is the first temperature sensor; 32 is the second temperature sensor; 4 is the commutation controller; 41 is the flow direction control valve. Detailed implementation manners

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Based on the idea of enabling each battery cell to work in a suitable temperature environment, the present application proposes a battery thermal management system based on a countercurrent liquid cooling plate, and independently designs a device with a different structural form from traditional liquid cooling plate cooling. Traditional liquid cooling plate cooling makes the coolant flow unidirectionally, while the battery thermal management system with a countercurrent liquid cooling plate designed in the present application can achieve bidirectional flow.

[0026] As Figure 1 shown, a battery thermal management system based on a countercurrent liquid cooling plate is arranged at the bottom of the battery cell module 1, and includes a liquid cooling plate assembly 2, a temperature sensing system 3, and a commutation controller 4. The temperature sensing system 3 is arranged on the liquid cooling plate assembly 2 and is used to monitor the temperature difference between the inlet and outlet of the coolant. The commutation controller 4 is connected to the liquid cooling plate assembly 2 and is used to control the flow direction of the coolant in the liquid cooling plate assembly 2. The temperature sensing system 3 is electrically connected to the commutation controller 4 and is used to issue an instruction to make the commutation controller 4 control the reverse flow of the coolant.

[0027] The bottom of the battery cell module 1 is in contact with the liquid cooling plate 21 through a thermal conductive adhesive or a thermal conductive structural adhesive. The top of the battery cell module 1 is in contact with air, and natural convection heat transfer occurs between the top of the battery cell module 1 and the air.

[0028] By arranging a liquid cooling plate assembly 2 at the bottom of the battery cell module 1 to cool each battery cell in the battery cell module 1, the front-end battery cells at the inlet of the liquid cooling plate assembly 2 are the first to come into contact with the coolant. Therefore, the cooling effect of the front-end battery cells is the best. Since the coolant exchanges heat with the front-end heat-generating battery cells, the temperature at the outlet end of the coolant is higher than that at the inlet. Therefore, the cooling effect of the rear-end battery cells at the outlet of the liquid cooling plate assembly 2 is not as good as that of the front end.

[0029] Therefore, in order to avoid the temperature difference between the front-end battery cells and the rear-end battery cells caused by this temperature difference, a temperature sensing system 3 and a commutation controller 4 are specifically set. When the temperature sensing system 3 detects that the temperature difference between the liquid cooling plate inlet pipe 22 and the liquid cooling plate outlet pipe 23 is 3°C, the temperature sensing system 3 controls the commutation controller 4 to commutate through a signal sensor, so that the original liquid cooling plate inlet pipe 22 becomes the liquid cooling plate outlet pipe, and the original liquid cooling plate outlet pipe 23 becomes the liquid cooling plate inlet pipe, and the flow direction of the coolant is reversed, so that both the front end and the rear end of the battery cells can come into contact with the coolant first for cooling, eliminating the temperature difference that appears during the cooling process.

[0030] The liquid cooling plate assembly 2 includes a liquid cooling plate 21, a liquid cooling plate inlet pipe 22, and a liquid cooling plate outlet pipe 23. The liquid cooling plate 21 is arranged at the bottom of the battery cell module 1. One end of the liquid cooling plate inlet pipe 22 is connected to the commutation controller 4, and the other end is connected to the liquid cooling plate 21. One end of the liquid cooling plate outlet pipe 23 is connected to the commutation controller 4, and the other end is connected to the liquid cooling plate 21.

[0031] The material of the liquid cooling plate 21 is AL3003, which has good thermal conductivity and corrosion resistance. The coolant flow channel 24 is perpendicular to the large surface of the battery cell module 1.

[0032] The coolant flows through the liquid cooling plate inlet pipe 22 into the coolant flow channel 24 of the liquid cooling plate 21 to cool the battery cell module 1. Finally, the cooled coolant is discharged through the liquid cooling plate outlet pipe 23. When the temperature sensing system 3 detects that the temperature difference between the liquid cooling plate inlet pipe 22 and the liquid cooling plate outlet pipe 23 is 3°C, the temperature sensing system 3 controls the commutation controller 4 to commutate through a signal sensor. The commutation controller 4 controls the coolant to enter the coolant flow channel 24 of the liquid cooling plate 21 from the liquid cooling plate outlet pipe 23 to cool the battery cell module 1. Finally, the cooled coolant is discharged through the liquid cooling plate inlet pipe 22.

[0033] Such as Figure 2As shown, a coolant flow channel 24 is provided on the liquid cooling plate 21. The coolant flow channel 24 is provided with a coolant inlet and a coolant outlet. The liquid cooling plate inlet pipe 22 is connected to the coolant inlet on the coolant flow channel 24, and the liquid cooling plate outlet pipe 23 is connected to the coolant outlet on the coolant flow channel 24.

[0034] The setting of the coolant flow channel 24 is in contact with the battery cell module 1 through thermal conductive adhesive or thermally conductive structural adhesive to the greatest extent. The larger the contact area, the better the cooling effect. In a relatively small liquid cooling plate 21, the flow channels tend to be in series because the series structure is simple and the overall flow velocity is uniform. Therefore, S-shaped flow channels in series are more commonly used, but this is not the only setting method.

[0035] However, the series S-shaped flow channel has an obvious disadvantage, which will cause a large temperature difference between the front and back of the coolant inlet and outlet of the flow channel. The battery thermal management system of the countercurrent liquid cooling plate 21 in this application enables the coolant to flow forward and backward repeatedly in the liquid cooling plate 21, forming a reciprocating flow. When the coolant flows forward, the temperature of the battery cells at the front end of the liquid cooling plate 21 is low, and the temperature of the battery cells at the rear end is high; when the coolant flows backward, the temperature of the battery cells at the rear end of the liquid cooling plate 21 is low, and the temperature of the battery cells at the front end is high. By reciprocating flow, the temperature difference between the front and back of the flow channel is reduced, ensuring the consistency of the battery cell temperature.

[0036] The temperature sensing system 3 includes a first temperature sensor 31 and a second temperature sensor 32. The first temperature sensor 31 is provided on the liquid cooling plate inlet pipe 22, and the second temperature sensor 32 is provided on the liquid cooling plate outlet pipe 23.

[0037] The purpose of setting the first temperature sensor 31 and the second temperature sensor 32 is to detect the temperature difference between the liquid cooling plate inlet pipe 22 and the liquid cooling plate outlet pipe 23. When the temperature difference between the liquid cooling plate inlet pipe 22 and the liquid cooling plate outlet pipe 23 is 3°C, the temperature sensing system 3 controls the commutation controller 4 to commutate through the signal sensor.

[0038] The commutation controller 4 includes a flow direction control valve 41. The flow direction control valve 41 is provided in the commutation controller 4 to control the flow direction of the coolant in the liquid cooling plate 21.

[0039] As Figure 3 shown, first, the coolant enters the coolant inlet on the liquid cooling plate 21 through the liquid cooling plate inlet pipe 22. The coolant flows through the coolant flow channel 24, passes through the coolant outlet and flows out from the liquid cooling plate outlet pipe 23. At this time, the coolant is flowing forward.

[0040] As Figure 4As shown, when the temperature sensing system 3 detects that the temperature difference between the inlet pipe 22 and the outlet pipe 23 of the liquid cooling plate is 3°C, the temperature sensing system 3 controls the commutation controller 4 to commutate through the signal sensor, so that the original inlet pipe 22 of the liquid cooling plate becomes the outlet pipe of the liquid cooling plate, and the original outlet pipe 23 of the liquid cooling plate becomes the inlet pipe of the liquid cooling plate, and the flow direction of the coolant is converted, so that both the front end and the rear end of the battery cell can first contact the coolant for cooling, eliminating the temperature difference that appears during the cooling process.

[0041] A peristaltic pump is provided in the commutation controller 4, which can provide a corresponding working fluid flow according to the temperature distribution of the battery cell module 1.

[0042] When the temperature of the battery cell module 1 is less than 5°C, the liquid heating mode is turned on. When the temperature is greater than 10°C, the liquid heating mode is turned off. The temperature of the coolant used in the liquid heating mode is 40°C. When the temperature of the battery cell is greater than 30°C, liquid cooling is turned on. When the temperature is less than 25°C, the liquid cooling mode is turned off. The temperature of the coolant used in the liquid cooling mode is 20°C. When the temperature is between 5°C and 30°C, the battery thermal management system pauses operation.

[0043] It further includes a second liquid cooling plate assembly, and the second liquid cooling plate assembly is arranged on the top of the battery cell module 1. This system is applicable to various cooling methods and can cooperate with the second liquid cooling plate assembly arranged on the top to cool the battery cell module 1.

[0044] The coolant used is a 50% ethylene glycol aqueous solution.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery thermal management system based on a countercurrent liquid cooling plate, which is arranged at the bottom of the battery cell module (1), and is characterized in that: It includes a liquid cooling plate assembly (2), a temperature sensing system (3), and a commutation controller (4). The temperature sensing system (3) is arranged on the liquid cooling plate assembly (2) and is used to monitor the temperature difference between the inlet and outlet of the coolant. The commutation controller (4) is connected to the liquid cooling plate assembly (2). The commutation controller (4) is used to control the flow direction of the coolant in the liquid cooling plate assembly (2). The temperature sensing system (3) is electrically connected to the commutation controller (4) and is used to issue an instruction to make the commutation controller (4) control the commutation flow of the coolant.

2. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 1, wherein: The liquid cooling plate assembly (2) includes a liquid cooling plate (21), a liquid cooling plate inlet pipe (22), and a liquid cooling plate outlet pipe (23). The liquid cooling plate (21) is arranged at the bottom of the battery cell module (1). One end of the liquid cooling plate inlet pipe (22) is connected to the commutation controller (4), and the other end is connected to the liquid cooling plate (21). One end of the liquid cooling plate outlet pipe (23) is connected to the commutation controller (4), and the other end is connected to the liquid cooling plate (21).

3. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 2, characterized in that: Coolant flow channels (24) are arranged on the liquid cooling plate (21). The coolant flow channels (24) are provided with a coolant inlet and a coolant outlet. The liquid cooling plate inlet pipe (22) is connected to the coolant inlet on the coolant flow channels (24). The liquid cooling plate outlet pipe (23) is connected to the coolant outlet on the coolant flow channels (24).

4. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 2, characterized in that: The temperature sensing system (3) includes a first temperature sensor (31) and a second temperature sensor (32). The first temperature sensor (31) is arranged on the liquid cooling plate inlet pipe (22). The second temperature sensor (32) is arranged on the liquid cooling plate outlet pipe (23).

5. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 2, characterized in that: The commutation controller (4) includes a flow direction control valve (41). The flow direction control valve (41) is arranged inside the commutation controller (4) and is used to control the flow direction of the coolant in the liquid cooling plate (21).

6. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 3, wherein: The coolant flow channels (24) are in the form of a series-connected S-shaped flow channel.

7. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 1, characterized in that: It further includes a second liquid cooling plate assembly which is arranged on the top of the battery cell module (1).

8. The battery thermal management system based on a countercurrent liquid cooling plate according to claim 1, wherein: The coolant is a 50% ethylene glycol aqueous solution.

9. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 2, wherein: The bottom of the battery cell module (1) is in contact with the liquid cooling plate (21) through a thermal conductive adhesive or a thermal conductive structural adhesive. The top of the battery cell module (1) is in contact with the air.

10. The battery thermal management system based on the countercurrent liquid cooling plate according to claim 2, characterized in that: The material of the liquid cooling plate (21) is AL3003.

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