Cooling system of power battery, control method, vehicle, equipment and medium

Abstract

The invention discloses a cooling system of a power battery, a control method, a vehicle, equipment and a medium. The cooling system of the power battery comprises a first water inlet and a second water inlet which are symmetrically arranged on the left side and the right side of the power battery; the first water outlet and the second water outlet are symmetrically formed in the left and right sides of the power battery; the first water inlet is connected with the second water outlet through the first water cooling plates; the second water inlets are connected with the first water outlets through the second water-cooling plates, and the second water-cooling plates and the first water-cooling plates are arranged in a crossed mode and conduct heat exchange with the battery modules arranged in sequence. By adopting the embodiment of the invention, the temperature difference between the temperature of the power battery and the single batteries can be effectively reduced, so that the performance degradation of the battery and the discharge difference of the battery module are reduced, and the service life of the power battery is prolonged; the fast charging peak power and duration can be improved by reducing the temperature difference, and the fast charging capacity of the power battery is enhanced.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a cooling system, control method, vehicle, equipment and medium for a power battery. Background Technology

[0002] During vehicle operation, the power battery often generates heat. Currently, most commonly used cooling solutions employ a single-inlet, single-outlet coolant flow channel design, such as... Figure 2 As shown, the coolant flows in through a single inlet, passes through the battery module, and exits through a single outlet. However, this design can easily lead to excessively high temperatures and uneven temperature distribution in certain areas inside the battery. For example, the battery temperature is lower closer to the inlet area, and higher closer to the outlet area due to heat exchange, resulting in a significant temperature difference within the battery. This temperature difference has several impacts: Inside the battery, batteries in the high-temperature zone experience shorter cycle life, while those in the low-temperature zone are at risk of lithium plating, both leading to performance degradation. Furthermore, a large temperature difference increases the internal resistance difference between different temperatures within the battery, causing inconsistent discharge and affecting the overall discharge capacity. Additionally, during charging, when the temperature difference reaches a certain threshold, the system limits the peak power and duration of fast charging, thus impacting the battery's fast-charging capability. Summary of the Invention

[0003] Based on this, the present invention provides a cooling system, control method, vehicle, equipment and medium for a power battery, which can effectively reduce the temperature difference between the power battery and the individual cells, thereby reducing battery performance degradation and discharge differences between battery modules, and extending the service life of the power battery; the reduced temperature difference can improve the peak power and duration of fast charging, and enhance the fast charging capability of the power battery.

[0004] In a first aspect, a cooling system for a power battery is provided, the power battery comprising a plurality of battery modules arranged in sequence, the cooling system comprising: The first water inlet and the second water inlet are symmetrically arranged on the left and right sides of the power battery. The first water outlet and the second water outlet are symmetrically arranged on the left and right sides of the power battery. Multiple first water-cooled plates are spaced apart, wherein the first water inlet is connected to the second water outlet in sequence through the multiple first water-cooled plates; Multiple second water-cooled plates are spaced apart, wherein the second water inlet is connected to the first water outlet in sequence through multiple second water-cooled plates, and the multiple second water-cooled plates and multiple first water-cooled plates are arranged in a cross manner. The multiple first water-cooled plates and multiple second water-cooled plates arranged in a cross manner exchange heat with multiple battery modules arranged in sequence.

[0005] Furthermore, the first water inlet is connected to the second water outlet in sequence through a plurality of preset flow channel structures within the first water-cooling plates, and the second water inlet is connected to the first water outlet in sequence through a plurality of preset flow channel structures within the second water-cooling plates.

[0006] Furthermore, during the cooling of the power battery, a portion of the fluid in the cooling system flows in from the first inlet, passes through multiple first water-cooling plates in sequence, and then flows out from the second outlet. Another portion of the fluid in the cooling system flows in from the second inlet, passes through multiple second water-cooling plates in sequence, and then flows out from the first outlet.

[0007] Furthermore, it also includes: A first valve and a second valve are provided. The first valve is located at the first inlet to regulate the flow rate of the fluid entering the first inlet, and the second valve is located at the second inlet to regulate the flow rate of the fluid entering the second inlet.

[0008] Furthermore, the opening degree of the first valve and the second valve is adjusted according to the temperature difference between the lowest temperature and the highest temperature of the individual cells in the power battery.

[0009] Furthermore, when the temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery is not greater than a predetermined temperature difference, the opening degree of the first valve and the second valve is the same. When the temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery is greater than the predetermined temperature difference, the opening degree of the first valve or the second valve is reduced according to the position of the single cell with the lowest temperature and the position of the single cell with the highest temperature in the power battery.

[0010] In a second aspect, a control method for a cooling system of a power battery is provided, the power battery comprising a plurality of battery modules arranged in sequence, the cooling system being the cooling system described in the first aspect above, and the control method comprising: The temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery is obtained. The flow rate of the fluid entering the first inlet or the second inlet is adjusted according to the temperature difference.

[0011] Thirdly, a vehicle is provided, comprising: a control method for a cooling system of a power battery according to the first aspect described above.

[0012] Fourthly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements a control method for the cooling system of a power battery according to the second aspect described above.

[0013] Fifthly, a computer-readable storage medium is provided, including a memory and a computer program stored on the memory and executable on a processor, wherein when executed by the processor, the program implements a control method for a cooling system of a power battery according to the second aspect described above.

[0014] In the embodiments of this application, the temperature difference between the lowest and highest temperatures of individual cells within the power battery is first obtained; then, the flow rate of the fluid entering the first or second water inlet is adjusted according to the temperature difference. Therefore, the temperature difference between the power battery and individual cells can be effectively reduced, thereby reducing battery performance degradation and discharge differences between battery modules, and extending the lifespan of the power battery. A lower temperature difference can also increase the peak power and duration of fast charging, enhancing the fast charging capability of the power battery. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the cooling system for a power battery provided in an embodiment of this application; Figure 2 This is a diagram of a conventional battery pack cooling structure provided in an embodiment of this application; Figure 3 A structural diagram of a battery pack cooling system with bidirectional crossflow channels provided in an embodiment of this application; Figure 4 Exploded view of a battery pack cooling system with bidirectional crossflow channels provided in an embodiment of this application; Figure 5 A structural diagram of the bottom water-cooled plate bidirectional cross-flow channel expansion scheme provided in the embodiments of this application; Figure 6 Overall diagram of the bottom water-cooled plate bidirectional cross-flow channel expansion scheme provided in the embodiments of this application; Figure 7 A control logic diagram of the cooling system for a power battery provided in an embodiment of this application; Figure 8 A flowchart of a control method for a power battery cooling system provided in an embodiment of this application; Figure 9This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.

[0017] It should be noted that, unless otherwise specified, the embodiments and features of the embodiments in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] The following describes in detail, with reference to the accompanying drawings, a cooling system, control method, vehicle, equipment, and medium for a power battery according to embodiments of this application.

[0019] Figure 1 This is a schematic diagram of a cooling system for a power battery according to an embodiment of this application. Figure 1 As shown, a cooling system for a power battery according to an embodiment of this application includes: a first water inlet 110, a second water inlet 120, a first water outlet 130, a second water outlet 140, a plurality of first water-cooling plates 150 spaced apart, and a plurality of second water-cooling plates 160 spaced apart, wherein: The first water inlet 110 and the second water inlet 120 are symmetrically arranged on the left and right sides of the power battery.

[0020] The first water outlet 130 and the second water outlet 140 are symmetrically arranged on the left and right sides of the power battery.

[0021] Multiple first water-cooled plates 150 are spaced apart, wherein the first water inlet is sequentially connected to the second water outlet through the multiple first water-cooled plates.

[0022] Multiple second water-cooled plates 160 are spaced apart, wherein the second water inlet is connected to the first water outlet in sequence through multiple second water-cooled plates, and the multiple second water-cooled plates and multiple first water-cooled plates are arranged in a cross manner. The multiple first water-cooled plates and multiple second water-cooled plates arranged in a cross manner exchange heat with multiple battery modules arranged in sequence.

[0023] In one embodiment of this application, the first water inlet is sequentially connected to the second water outlet through a plurality of preset flow channel structures within the first water-cooling plates, and the second water inlet is sequentially connected to the first water outlet through the plurality of preset flow channel structures within the second water-cooling plates.

[0024] In one embodiment of this application, when the power battery is cooled, a portion of the fluid in the cooling system flows in from the first inlet, passes through multiple first water-cooling plates in sequence, and then flows out from the second outlet. Another portion of the fluid in the cooling system flows in from the second inlet, passes through multiple second water-cooling plates in sequence, and then flows out from the first outlet.

[0025] Current mainstream cooling methods mostly employ, for example Figure 2 The cooling structure shown depicts a system where fluid flows into the cooling system through a single inlet, passes through the battery module, and exits through a single outlet. This invention, however, incorporates a dual-sided inlet / outlet design and a cross-flow channel structure, combined with… Figure 4 As shown, since the first and second water-cooled plates are arranged in a cross pattern, when a part of the fluid passes through multiple first water-cooled plates and another part of the fluid passes through multiple second water-cooled plates, a heat-counting zone will be formed between adjacent first and second water-cooled plates, so that the internal temperature of the power battery is balanced, thereby avoiding a large temperature difference.

[0026] In one embodiment of this application, it further includes: A first valve and a second valve are provided. The first valve is located at the first inlet to regulate the flow rate of the fluid entering the first inlet, and the second valve is located at the second inlet to regulate the flow rate of the fluid entering the second inlet.

[0027] In one embodiment of this application, the opening degree of the first valve and the second valve is adjusted according to the temperature difference between the lowest temperature and the highest temperature of the individual cells in the power battery.

[0028] In one embodiment of this application, when the temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery is not greater than a predetermined temperature difference, the opening degree of the first valve and the second valve is the same. When the temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery is greater than the predetermined temperature difference, the opening degree of the first valve or the second valve is reduced according to the position of the single cell with the lowest temperature and the position of the single cell with the highest temperature in the power battery.

[0029] Specifically, combined Figure 3 As shown, valves are installed at the first and second water inlets, respectively, allowing the fluid in the cooling system to enter simultaneously from both inlets. The system's control logic is as follows: Figure 7As shown, when the temperature difference between individual cells within the power battery is not greater than a predetermined temperature difference, the opening degrees of the first and second valves are the same, meaning the fluid flow rates through the first and second cooling water plates are the same. When the temperature difference between individual cells within the power battery is detected to be greater than the predetermined temperature difference, or when the operating time exceeds a predetermined time threshold, the opening degree of the response valve is adjusted according to the positions of the lowest and highest temperature individual cells. For example, when the temperature difference between individual cells within the power battery is greater than 3°C, valve opening adjustment is performed. When the lowest temperature axis is located at the first cooling water plate and the highest temperature axis is located at the second cooling water plate, the opening degree of the first valve is reduced, thereby reducing the fluid flow rate through the first cooling water plate and thus reducing the temperature difference; conversely, the opening degree of the second valve is reduced, thereby reducing the fluid flow rate through the second cooling water plate.

[0030] In addition, flow balancing control is installed at the first and second water inlets. Specifically, based on feedback data from pressure sensors at the first and second water inlets, the opening of the first and second valves is dynamically adjusted to ensure that the flow rate deviation between the first and second water inlets is less than a certain threshold. For example, when the flow rate deviation between the first and second water inlets reaches 5%, the opening of either the first or second valve is adjusted to be less than 5%. This method maintains the flow rate difference between the first and second cooling plates within a reasonable range, preventing excessive flow rate deviation from causing insufficient local cooling or excessive temperature differences.

[0031] Tests have shown that the cooling system for the power battery proposed in this application can achieve a temperature difference of ≤3℃ across the entire power battery range; at the same time, compared with traditional solutions, it can increase the battery cycle life by 23%.

[0032] In practical applications, the cooling solution can be expanded according to actual needs, such as... Figure 5 and Figure 6 As shown, the first water inlet, first water outlet, second water inlet, and second water outlet can be placed within the same cooling plate, below the battery module, thereby achieving cooling while saving costs. In other examples, other extended configurations can be made according to specific needs.

[0033] According to an embodiment of the present invention, the cooling system for a power battery first obtains the temperature difference between the lowest and highest temperatures of individual cells within the power battery; then, it adjusts the flow rate of fluid entering the first or second water inlet based on the temperature difference. Therefore, it can effectively reduce the internal temperature and temperature difference of the power battery, thereby reducing battery performance degradation and discharge differences between battery modules in different locations, and extending the lifespan of the power battery. Simultaneously, the reduction in temperature and temperature difference can increase the peak power and duration of fast charging, thus enhancing the fast charging capability of the power battery.

[0034] Figure 8 This is a flowchart of a control method for a power battery cooling system according to an embodiment of this application. Figure 8 As shown, a control method for a cooling system of a power battery according to an embodiment of this application is provided. The power battery includes a plurality of battery modules arranged in sequence, and the cooling system is the cooling system of any of the power batteries described above. The control method includes the following steps: S801: Obtain the temperature difference between the lowest temperature and the highest temperature of a single cell in the power battery.

[0035] S802: Adjust the flow rate of the fluid entering the first inlet or the second inlet according to the temperature difference.

[0036] According to the control method of the cooling system of the power battery according to the embodiments of this application, the temperature difference between the lowest temperature and the highest temperature of the individual cells in the power battery is first obtained; then, the flow rate of the fluid entering the first water inlet or the second water inlet is adjusted according to the temperature difference. Therefore, the temperature difference between the power battery and the individual cells can be effectively reduced, thereby reducing battery performance degradation and discharge differences of battery modules, and extending the service life of the power battery; the reduction of the temperature difference can improve the peak power and duration of fast charging, and enhance the fast charging capability of the power battery.

[0037] Specific limitations regarding the control method for the power battery cooling system can be found in the above description of the power battery cooling system limitations, and will not be repeated here. Each module of the aforementioned power battery cooling system control method can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the computer device's memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0038] Furthermore, embodiments of this application provide a vehicle including a control method for a cooling system of a power battery according to any of the above embodiments. The vehicle can obtain the temperature difference between the lowest and highest temperatures of individual cells within the power battery; and then adjust the flow rate of fluid entering the first or second water inlet based on the temperature difference. Therefore, the temperature difference between the power battery and individual cells can be effectively reduced, thereby reducing battery performance degradation and discharge differences between battery modules, extending the lifespan of the power battery; the reduced temperature difference can also increase the peak power and duration of fast charging, enhancing the fast charging capability of the power battery.

[0039] Furthermore, other components and functions of the vehicle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0040] The following is for reference. Figure 9 , Figure 9 A schematic diagram of a computer device structure suitable for implementing embodiments of this application is shown. The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned control method embodiment for the cooling system of the power battery.

[0041] Specifically, according to embodiments of this application, the flowchart above refers to... Figure 8 The described process can be implemented as a computer-readable storage medium. For example, embodiments of this application include a computer-readable storage medium comprising a computer program containing program code for performing the methods shown in the flowchart, such as performing: obtaining the temperature difference between the lowest temperature and the highest temperature of a single cell within the power battery; and adjusting the flow rate of fluid entering the first inlet or the second inlet according to the temperature difference.

[0042] Specifically, according to embodiments of this application, the flowchart above refers to... Figure 8The described process can be implemented as a computer software program. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart, such as performing: obtaining the temperature difference between the lowest temperature and the highest temperature of a single cell within the power battery; and adjusting the flow rate of fluid entering the first inlet or the second inlet according to the temperature difference.

[0043] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0044] The units or modules described in the embodiments of this application can be implemented in software or hardware. The described units or modules can also be located in a processor. The names of these units or modules do not, in certain circumstances, constitute a limitation on the unit or module itself.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cooling system for a power battery, characterized in that, The power battery comprises a plurality of battery modules arranged in sequence, and the cooling system comprises: a first water inlet and a second water inlet, the first water inlet and the second water inlet being symmetrically arranged on the left and right sides of the power battery; a first water outlet and a second water outlet, the first water outlet and the second water outlet being symmetrically arranged on the left and right sides of the power battery; a plurality of first water cooling plates arranged at intervals, wherein the first water inlet is connected to the second water outlet through the plurality of first water cooling plates in sequence; a plurality of second water cooling plates arranged at intervals, wherein the second water inlet is connected to the first water outlet through the plurality of second water cooling plates in sequence, the plurality of second water cooling plates and the plurality of first water cooling plates are arranged in a cross manner, and the plurality of first water cooling plates and the plurality of second water cooling plates arranged in a cross manner correspond to the plurality of battery modules arranged in sequence one by one for heat exchange.

2. The cooling system of a power battery according to claim 1, characterized in that, The first water inlet is connected to the second water outlet through a preset flow channel structure in the plurality of first water cooling plates in sequence, and the second water inlet is connected to the first water outlet through the preset flow channel structure in the plurality of second water cooling plates in sequence.

3. The cooling system of a power battery according to claim 1, characterized in that, When the power battery is cooled, part of the fluid in the cooling system flows in from the first water inlet, sequentially passes through the plurality of first water cooling plates, and then flows out from the second water outlet, and another part of the fluid in the cooling system flows in from the second water inlet, sequentially passes through the plurality of second water cooling plates, and then flows out from the first water outlet.

4. The cooling system of a power battery according to claim 3, characterized in that, Further comprising: a first valve and a second valve, the first valve being arranged at the first water inlet to adjust the flow of fluid entering the first water inlet, and the second valve being arranged at the second water inlet to adjust the flow of fluid entering the second water inlet.

5. The cooling system of a power battery according to claim 4, characterized in that, The opening degrees of the first valve and the second valve are adjusted according to the temperature difference between the lowest temperature of the single battery in the power battery and the highest temperature of the single battery.

6. The cooling system of power batteries according to claim 5, characterized in that, Wherein, When the temperature difference between the lowest temperature of the single battery in the power battery and the highest temperature of the single battery is not greater than a predetermined temperature difference, the opening degrees of the first valve and the second valve are the same, and when the temperature difference between the lowest temperature of the single battery in the power battery and the highest temperature of the single battery is greater than the predetermined temperature difference, the opening degree of the first valve or the second valve is reduced according to the position of the single battery with the lowest temperature and the position of the single battery with the highest temperature in the power battery.

7. A control method of a cooling system of a power battery, characterized by, The power battery comprises a plurality of battery modules arranged in sequence, and the cooling system is the cooling system according to any one of claims 1-6, and the control method comprises: obtaining the temperature difference between the lowest temperature of the single battery and the highest temperature of the single battery in the power battery; adjusting the flow of fluid entering the first water inlet or the second water inlet according to the temperature difference.

8. A vehicle characterized by comprising: Comprising: a cooling system of a power battery according to any one of claims 1-6.

9. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the control method of the cooling system of the power battery according to claim 7.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program product is executed by the processor to implement the control method of the cooling system of the power battery according to claim 7.

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