Power battery thermal management device

Abstract

The invention relates to a power battery heat management device, and relates to the technical field of battery heat dissipation. The liquid cooling plate comprises a temperature acquisition system, a flow control system, a connecting line between the temperature acquisition system and the flow control system, a connecting line of the temperature acquisition system, a connecting line of the flow control system, a liquid inlet, a liquid cooling plate body, a flow channel, a temperature sensor, a proportional valve and a liquid outlet, the flow channel is connected with the liquid inlet and the liquid outlet, the overall shape of the flow channel is in a bifurcated pulse shape and has a variable diameter, and the flow control system adjusts the opening degree of the proportional valve of each branch according to the cooling liquid temperature, monitored by the temperature collecting system, of each branch so as to adjust the flow of each branch. The method has the effects of reducing local hot spots in the cooling process and improving the temperature uniformity of the cooled battery.

Description

Technical Field

[0001] The present application relates to the field of power lithium battery cooling, and in particular to a power battery thermal management device. Background Art

[0002] During the charging and discharging process of electric vehicles, the battery cells generate a lot of heat and the layout space of the power lithium battery pack is compact, which has a further negative impact on the heat dissipation of the power lithium battery pack. As the driving state of the vehicle changes, the discharge rate of the lithium battery pack will change significantly, which will lead to irregular changes in the location of local hot spots. The liquid cooling plate is an important component of the liquid cooling system of the power lithium battery. At present, the liquid cooling plate of the power lithium battery has the problem that heat gradually accumulates with the flow of coolant in the flow channel, the heat exchange capacity gradually deteriorates, the temperature of the power lithium battery is too high, and the cooling is uneven. A new technical solution is urgently needed to solve this problem. Summary of the invention

[0003] In response to the above technical problems, the present application proposes a power battery thermal management device, which solves the problems of excessive power lithium battery temperature, uneven cooling and local hot spots in the current power lithium battery liquid cooling solution.

[0004] To achieve the above purpose, the present application is implemented by the following technical solutions: a power battery thermal management device, including a temperature acquisition system, a flow control system, a connecting line between the temperature acquisition system and the flow control system, a temperature acquisition system connecting line, a flow control system connecting line, a liquid inlet, a liquid cooling plate body, a flow channel, a temperature sensor, a proportional valve, and a liquid outlet, wherein the liquid inlet and the liquid outlet are located on opposite sides of the liquid cooling plate body, and the liquid inlet and the liquid outlet are both circular; the flow channel connects the liquid inlet and the liquid outlet, and the overall shape of the flow channel is a bifurcated vein with variable diameter. The temperature sensors arranged on each branch of the flow channel monitor the temperature of the coolant in each branch and transmit the data to the temperature acquisition system, and the flow control system adjusts the opening of the proportional valve according to the temperature data in the temperature acquisition system. When the coolant temperature of a certain flow channel branch is higher than the average value of the temperature of each branch, the flow control system adjusts the branch flow by increasing the opening of the proportional valve to reduce the temperature of the power lithium battery near the branch, and when the coolant temperature of a certain flow channel branch is lower than the average value of the temperature of each branch, the flow control system adjusts the branch flow by reducing the opening of the proportional valve to reduce the cooling of the power lithium battery near the branch.

[0005] Furthermore, the liquid cooling plate body is composed of two upper and lower aluminum plates, a channel-shaped groove with a channel radius depth is opened on the lower side of the upper aluminum plate, and a channel-shaped groove with a channel radius depth is opened on the upper side of the lower aluminum plate, and the upper and lower aluminum plates are connected by vacuum brazing.

[0006] Furthermore, the flow channel has a variable diameter.

[0007] Furthermore, the flow channel is a cylindrical flow channel.

[0008] Furthermore, the flow channel as a whole is a bifurcated vein structure.

[0009] Furthermore, each branch of the flow channel is provided with a temperature sensor and a proportional valve.

[0010] Compared with the prior art, the beneficial effects of the present application are as follows: the forked vein-shaped power lithium battery liquid cooling plate of the present application has a forked vein-shaped flow channel, and the optimization of the flow channel shape improves the situation where heat gradually accumulates with the flow of the coolant and the heat exchange capacity gradually deteriorates. The flow channel is provided with a variable diameter, and the flow channel diameter gradually decreases along the flow direction, and the coolant flow rate in the flow channel gradually increases, which can improve heat transfer and further improve the situation where heat gradually accumulates with the flow of the coolant and the heat exchange capacity gradually deteriorates. The data acquisition and analysis system is linked with the temperature sensor and the proportional valve, which can effectively solve the problem of excessively high local temperature of the power lithium battery. The present application solves the problems of high power lithium battery temperature, large temperature difference and local hot spot cooling that exist in the current power lithium battery cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure provided for an embodiment of the present application.

[0012] In the attached figure: 1. Liquid inlet; 2. Liquid cooling plate body; 3. Flow channel; 4. Liquid outlet; 5. Temperature sensor; 6. Proportional valve; 7. Flow control system; 8. Temperature acquisition system; 9. Connection line between temperature acquisition system and flow control system; 10. Temperature acquisition system connection line. DETAILED DESCRIPTION

[0013] In order to enable technical personnel in the relevant fields to better understand the present application, the technical solution of the present application is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0014] In the description of the present application, it should be noted that the terms "upper" and "lower" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, and therefore cannot be understood as a limitation on the present application.

[0015] See also Figure 1The bifurcated vein-shaped power lithium battery liquid cooling plate provided in the embodiment of the present application includes a liquid inlet 1, a liquid cooling plate body 2, a flow channel 3, a liquid outlet 4, a temperature sensor 5, a proportional valve 6, a flow control system 7, a temperature acquisition system 8, a connecting line 9 between the temperature acquisition system and the flow control system, and a temperature acquisition system connecting line 10. The liquid inlet 1 and the liquid outlet 4 are respectively arranged at opposite ends of the diagonal line of the liquid cooling plate body 2. In this embodiment, the liquid inlet 1 and the liquid outlet 4 are both circular. The flow channel 3 is arranged in a bifurcated vein shape, and the flow channel 3 has a variable diameter. The flow channel 3 connects the liquid inlet 1 and the liquid outlet 4. A temperature sensor 5 and a proportional valve 6 are arranged on each branch of the flow channel 3.

[0016] The temperature sensor 5 is installed at the end of each branch of the flow channel 3 to measure the temperature of the fluid in the end of each branch of the flow channel 3 and transmit the monitoring data to the temperature acquisition system 8. The flow control system 7 sends a signal to the proportional valve 6 according to the coolant temperature of each branch in the flow channel 3 monitored by the temperature acquisition system 8. The proportional valve 6 controls the flow of the branch by increasing or decreasing the opening and closing degree of the valve body. The connection line between the temperature sensor 5 and the proportional valve 6 is located below the liquid cooling plate body 2, and the power lithium battery pack is placed above the liquid cooling plate body 2.

[0017] When the present application is working: the coolant enters the flow channel 3 from the liquid inlet 1, and the flow channel 3 is a bifurcated vein and is designed with a variable diameter. This design ensures that the coolant flows evenly through different branches, and the coolant flow processes of different branches are basically the same. This design improves the situation that the temperature of the power lithium battery in the current power lithium battery liquid cooling scheme is too high and the cooling is uneven. When the coolant of different branches flows through the branch temperature sensor 5, the temperature sensor 5 measures its temperature and transmits it to the temperature acquisition system 8. When the temperature of a branch is higher than the average temperature of each branch, the flow control system 7 increases the opening of the branch proportional valve 6. When the temperature of a branch is lower than the average temperature of each branch, the flow control system 7 reduces the opening of the branch proportional valve 6. This design solves the problem of local hot spot cooling in the current power lithium battery liquid cooling scheme.

[0018] The present application solves the problems of high temperature and large temperature difference in the cooling process of power lithium batteries existing in the current power lithium battery cooling process through the reasonably designed bifurcated vein flow channel 3, temperature sensor 5, flow control system 7, temperature acquisition system 8, and proportional valve 6.

[0019] Specifically, the flow channel 3 in this embodiment is a cylindrical flow channel. Those skilled in the relevant art may select other shapes according to specific needs, which is not further limited here.

[0020] Specifically, the liquid inlet 1 and the liquid outlet 4 in this embodiment are arranged at opposite ends of the diagonal line of the liquid cooling plate body 2. Technical personnel in the relevant field can arrange them on any opposite sides of the liquid cooling plate body 2 according to specific needs, and no further limitation is made here.

[0021] Specifically, in this embodiment, the liquid cooling plate body 2 is an aluminum plate. Those skilled in the art may select other materials, such as copper, alloy, etc., according to specific needs, which is not further limited here.

[0022] Specifically, the cooling liquid flowing in the flow channel 3 in this embodiment is an aqueous solution of ethylene glycol. Those skilled in the relevant art may select other liquids according to specific needs, which is not further limited here.

[0023] A power battery thermal management device provided in the present application effectively solves the problems of poor cooling effect, uneven cooling and local hot spots of the power lithium battery liquid cooling plate, and can effectively improve the service life and safety performance of the power lithium battery.

[0024] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A power battery thermal management device, characterized in that: The invention comprises a liquid inlet (1), a liquid cooling plate body (2), and a flow channel (3). A temperature sensor (5) and a proportional valve (6) are installed on the flow channel. A lithium battery pack is placed above the liquid cooling plate body (2). The temperature sensor (5) transmits the temperature of each branch cooling liquid to a temperature collection system (8) via a temperature collection system connection line (10). The temperature collection system (8) transmits a temperature signal to a flow control system (7) via a connection line (9) between the temperature collection system and a flow control system. The flow control system (7) transmits a signal to the proportional valve (6) to control the opening of the proportional valve (6).

2. A power battery thermal management device according to claim 1, characterized in that: The flow channel (3) is in the shape of a bifurcated vein.

3. A power battery thermal management device according to claim 1, characterized in that: The flow channel inlet (1) and the liquid outlet (4) are located at two opposite corners of the liquid cooling plate body (2).

4. A power battery thermal management device according to claim 1, characterized in that: The proportional valve (6) responds to the feedback signal from the temperature sensor (5).

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