Liquid cooling plate flow channel self-adaptive regulation method based on temperature difference feedback of micro area on surface of battery cell

Abstract

This invention discloses an adaptive control method for liquid cooling plate flow channels based on micro-area temperature difference feedback on the battery cell surface, relating to the field of battery thermal management technology. The method includes: collecting the temperature of the micro-area on the battery cell surface and the flow rate of the cooling circuit; smoothing the temperature of the micro-area on the battery cell surface; calculating the relative temperature difference of the micro-area on the battery cell surface and determining the hot spot location and intensity; merging the micro-areas on the battery cell surface according to the hot spot location to obtain the hot spot shunt side; calculating the load ratio of the hot spot shunt side using the relative temperature difference of the micro-areas on the battery cell surface; adjusting the opening of the outlet proportional valve of the liquid cooling plate according to the load ratio of the hot spot shunt side; opening the pixel bypass micro-valve at the hot spot location and adjacent micro-areas on the battery cell surface; opening the air duct when the hot spot intensity exceeds a preset intensity threshold; and recording the opening of the outlet proportional valve, the state of the pixel bypass micro-valve, and the direction of the air duct as execution parameters. This invention solves the problem of hot spot suppression hysteresis by smoothing the micro-area temperature sequence and calculating the relative temperature difference.

Description

Technical Field

[0001] This invention relates to the field of battery thermal management technology, and in particular to an adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface. Background Technology

[0002] In the field of power battery thermal management, electric vehicles and energy storage batteries widely use liquid cooling plates for temperature control because liquid cooling plates have high convective heat transfer capacity, small volume and good structural integration. Existing technologies usually achieve loop flow distribution based on the fixed flow channel of the cold plate and the opening adjustment of the pump / proportional valve, and cooperate with the temperature sensor of the cell surface or module for temperature control. Some existing technologies use thermal network models, MPC or rule control to maintain the temperature window and suppress temperature rise under different operating conditions.

[0003] Nevertheless, there are still areas for improvement in existing methods. First, existing liquid cooling control is difficult to characterize the micro-area temperature difference and hot spot spatial location on the cell surface, resulting in a lag in hot spot suppression. Second, circuit current attenuation and local blockage often lack health assessment and closed-loop emergency strategies coupled with temperature, making it difficult to identify circuit anomalies in a timely manner. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides an adaptive control method for the flow channel of a liquid cooling plate based on micro-area temperature difference feedback on the cell surface to solve the problems of hysteresis in hot spot suppression and difficulty in timely identification of circuit anomalies.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides an adaptive control method for the flow channel of a liquid cooling plate based on micro-region temperature difference feedback on the surface of the battery cell, comprising: Collect the surface micro-area temperature of the battery cell and the flow rate of the cooling circuit, smooth the surface micro-area temperature of the battery cell, calculate the relative temperature difference of the surface micro-area of ​​the battery cell, and determine the location and intensity of the hot spot; Based on the location of the hot spot, the micro-regions on the surface of the cell are merged to obtain the hot spot shunt side. The load ratio of the hot spot shunt side is calculated using the relative temperature difference of the micro-regions on the surface of the cell. Adjust the opening of the outlet proportional valve of the liquid cooling plate according to the load ratio of the hot spot shunt side, and open the pixel bypass micro valve of the hot spot position and the micro area of ​​the adjacent cell surface. When the hot spot intensity exceeds the preset intensity threshold, the air duct is opened. At the same time, the opening of the outlet proportional valve, the state of the pixel bypass micro valve and the direction of the air duct are recorded as execution parameters. The flow health status of the cooling circuit is determined by the cooling circuit flow rate under the execution parameters, and either the circuit is normal or the circuit is abnormal. When the circuit is abnormal, the preset emergency strategy is activated. The recovery status of the circuit is determined by the cooling circuit flow rate and hot spot intensity under the preset emergency strategy, and either the circuit is recovered or not recovered is obtained. If the result is recovered, the circuit is cooled according to the execution parameters. If the result is not recovered, the preset emergency strategy is maintained.

[0007] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the battery cell surface described in this invention, the specific steps for smoothing the temperature of the micro-regions on the battery cell surface are as follows: Temperature sensors are used to collect the temperature of a micro-area on the surface of each cell, and flow sensors are used to collect the flow rate of the cooling circuit. Calculate the average temperature of each cell surface micro-region with the temperature of the cell surface micro-region at the previous moment, and use it as the cell surface micro-region temperature value.

[0008] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the battery cell surface described in this invention, the specific steps for determining the hot spot location and hot spot intensity are as follows: The reference temperature is set based on the temperature value of the micro-region on the surface of the battery cell. The relative temperature difference of each micro-region on the surface of the battery cell is calculated using the micro-region temperature value on the surface of the battery cell and the reference temperature. The micro-region on the surface of the battery cell with the largest relative temperature difference is taken as the hot spot location, and the corresponding relative temperature difference is taken as the hot spot intensity.

[0009] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channel based on temperature difference feedback of micro-regions on the cell surface described in this invention, wherein: the merging of micro-regions on the cell surface according to the hot spot position refers to setting the liquid cooling plate to a bidirectional flow splitting condition with central liquid inlet, dividing the micro-regions on the cell surface on the side where the hot spot is located into the hot spot flow splitting side, and dividing the micro-regions on the cell surface on the side that does not contain the hot spot position into the non-hot spot flow splitting side.

[0010] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface described in this invention, the specific steps for calculating the load ratio on the hot spot shunt side using the relative temperature difference of the micro-regions on the cell surface are as follows: The micro-regions on the cell surface with a non-negative relative temperature difference on the hot spot shunt side are defined as the hot spot hot region, and the micro-regions on the cell surface with a non-negative relative temperature difference on the non-hot spot shunt side are defined as the non-hot spot hot region. The sum of the relative temperature differences corresponding to the hot spot hot zone is taken as the hot spot heat load, and the sum of the relative temperature differences corresponding to the non-hot spot hot zone is taken as the non-hot spot heat load. The total heat load is calculated by taking the heat load of hot spots and the heat load of non-hot spots, and the ratio of the heat load of hot spots to the total heat load is taken as the load proportion of the hot spot shunt side.

[0011] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-area temperature difference feedback on the cell surface described in this invention, the specific steps of adjusting the opening degree of the outlet proportional valve of the liquid cooling plate according to the load ratio on the hot spot shunt side are as follows: Collect the upper and lower limits of the liquid cooling plate opening, and use the average of the upper and lower limits as the opening benchmark; Collect the maximum historical hot spot shunt side load percentage as the maximum proportional bias; The maximum opening offset is calculated using the maximum proportional offset, the opening reference, the upper limit of the opening, and the lower limit of the opening. The opening of the outlet proportional valve of the liquid cooler plate is adjusted based on the load ratio of the hot spot shunt side, the maximum opening offset, and the opening reference.

[0012] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-area temperature difference feedback on the battery cell surface described in this invention, the specific steps for adjusting the opening of the outlet proportional valve of the liquid cooling plate based on the hot spot shunt side load ratio, maximum opening offset, and opening reference are as follows. The opening degree of the proportional valve at the outlet of the hot spot shunt side and the opening degree of the proportional valve at the outlet of the non-hot spot shunt side are calculated using the load ratio of the hot spot shunt side, the maximum opening degree offset, and the opening degree reference, respectively. The opening of the outlet proportional valve of the liquid cooler is adjusted according to the opening of the outlet proportional valve on the hot spot split side and the outlet proportional valve on the non-hot spot split side.

[0013] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface described in this invention, the specific steps for determining the flow health status of the cooling circuit using the cooling circuit flow rate under the execution parameters are as follows. The flow rate of the cooling circuit under the execution parameters is collected using a flow sensor as the measured flow rate value. The temperature of the micro-area on the cell surface corresponding to the hot spot location is taken as the hot spot temperature. By correlating historical hotspot temperatures with corresponding historical cooling loop flow rates, a temperature-flow rate table is created. Arrange the temperature-flow meters in ascending order of historical hot spot temperature, and then divide the temperature-flow meters into hot spot temperature ranges and flow ranges evenly according to the number of historical hot spot temperatures, forming a temperature range-flow range table. Use the hot spot temperature to look up the corresponding flow range from the temperature range-flow range table as the normal flow range; When the measured flow rate is within the normal flow rate range, the flow health status is determined to be normal. When the measured flow rate exceeds the normal flow rate range, the flow health status is determined to be abnormal.

[0014] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface described in this invention, the specific steps for activating a preset emergency strategy when the circuit is abnormal are as follows: When the circuit is normal, the execution parameters remain unchanged; When the circuit is abnormal, adjust the opening of the proportional valve at the outlet of the hot spot shunt side and the opening of the proportional valve at the outlet of the non-hot spot shunt side to the opening reference. Set the state of the pixel bypass microvalve corresponding to the hot spot position to open; Set the state of the pixel bypass micro-valve in the micro-area of ​​the cell surface adjacent to the hot spot to closed; Set the air duct opening operation to the execution state, and set the direction of the air duct to the index of the micro-region on the surface of the cell corresponding to the hot spot position.

[0015] As a preferred embodiment of the adaptive control method for liquid cooling plate flow channels based on micro-area temperature difference feedback on the battery cell surface described in this invention, the specific steps for determining the recovery status of the circuit using the cooling circuit flow rate and hot spot intensity under a preset emergency strategy are as follows. The flow rate of the cooling circuit under the preset emergency strategy is collected by a flow sensor as the recovery judgment flow rate value; The temperature of the micro-area on the surface of the battery cell under the preset emergency strategy is collected by a temperature sensor as the recovery temperature; The recovery temperature is used to calculate the micro-area temperature value on the cell surface under the preset emergency strategy, and to determine the hot spot location and hot spot intensity under the preset emergency strategy. The hot spot intensity under the preset emergency strategy is used as the hot spot intensity for recovery judgment; The temperature value of the micro-area on the surface of the cell corresponding to the hot spot location under the preset emergency strategy is used as the hot spot temperature for recovery judgment. Use the recovery judgment hotspot temperature to look up the corresponding normal flow range from the temperature range-flow range table, and use it as the normal judgment flow range. When the recovery judgment traffic value is within the normal judgment traffic range, the traffic is judged to have recovered; when the recovery judgment traffic value exceeds the normal judgment traffic range, the traffic is judged not to have recovered. When the hot spot intensity is determined to be lower than the hot spot intensity at the previous moment, the hot spot intensity is determined to have recovered; when the hot spot intensity is determined to be not lower than the hot spot intensity at the previous moment, the hot spot intensity is determined not to have recovered. When both flow rate and hot spot intensity recover, the recovery status of the determination loop is considered recovered; when neither flow rate nor hot spot intensity recovers, the recovery status of the determination loop is considered unrecovered.

[0016] The beneficial effects of this invention are as follows: by smoothing the micro-area temperature sequence and calculating the relative temperature difference, a refined flow redistribution is achieved for areas with concentrated heat loads, improving the timeliness and spatial resolution of hot spot suppression, reducing peak temperature and temperature gradient, and solving the problem of hot spot suppression lag. In addition, by establishing a temperature-flow correlation table with historical hot spot temperatures and corresponding flow rates and dividing normal flow ranges, online identification of the loop flow health status is achieved, maintaining a controllable cooling path in the case of flow degradation, reducing the risk of overheating under abnormal operating conditions, and solving the problem of loop anomalies being difficult to identify in a timely manner. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of an adaptive control method for the flow channel of a liquid cooling plate based on micro-region temperature difference feedback on the surface of the battery cell.

[0019] Figure 2 A schematic diagram for determining the location and intensity of hot spots.

[0020] Figure 3 A diagram illustrating how to obtain execution parameters.

[0021] Figure 4 A schematic diagram for determining the recovery status of the circuit. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Reference Figures 1-4As one embodiment of the present invention, this embodiment provides an adaptive control method for the flow channel of a liquid cooling plate based on micro-region temperature difference feedback on the surface of the battery cell, comprising the following steps: S1: Collect the micro-area temperature on the cell surface and the flow rate of the cooling circuit, smooth the micro-area temperature on the cell surface, calculate the relative temperature difference of the micro-area on the cell surface, and determine the hot spot location and hot spot intensity.

[0026] S1.1: Use a temperature sensor to collect the temperature of a micro-area on the surface of each cell, and use a flow sensor to collect the flow rate of the cooling circuit.

[0027] Smoothing of the micro-area temperature on the cell surface: Calculate the average of the temperature of each micro-area on the cell surface and the temperature of the corresponding micro-area on the cell surface at the previous moment, and use it as the micro-area temperature value on the cell surface.

[0028] S1.2: The median temperature value of the micro-area on the surface of the battery cell is taken as the reference temperature, the difference between the temperature value of the micro-area on the surface of the battery cell and the reference temperature is taken as the relative temperature difference, the micro-area on the surface of the battery cell with the largest relative temperature difference is taken as the hot spot location, and the relative temperature difference corresponding to the hot spot location is taken as the hot spot intensity.

[0029] It should also be noted that when there is more than one micro-region on the surface of the cell with the largest relative temperature difference, the sum of the relative temperature differences between the micro-region on the surface of the cell with the largest relative temperature difference and the adjacent micro-region on the surface of the cell is used as the hot spot determination value, and the micro-region on the surface of the cell with the largest hot spot determination value is used as the hot spot location.

[0030] S2: Merge the micro-regions on the cell surface according to the hot spot location to obtain the hot spot shunt side, and use the relative temperature difference of the micro-regions on the cell surface to calculate the load ratio of the hot spot shunt side.

[0031] S2.1: Set the liquid cooling plate to a bidirectional flow splitting condition with central liquid inlet, so that the coolant enters from the central liquid inlet end of the liquid cooling plate and flows to the liquid outlet ends at both ends of the liquid cooling plate respectively. The micro-area on the cell surface corresponding to the side where the hot spot is located is taken as the hot spot splitting side, and the micro-area on the cell surface corresponding to the side where the hot spot is not located is taken as the non-hot spot splitting side.

[0032] S2.2: The relative temperature difference of micro-regions on the cell surface is used to calculate the load ratio on the hot spot shunt side, as shown in the following expression: ; in, The load percentage on the hot spot shunt side. For the hot spot shunt side The relative temperature difference of micro-regions on the surface of each battery cell This indicates taking the maximum value. For the non-hot spot shunt side The relative temperature difference of micro-regions on the surface of each battery cell This serves as an index for the micro-regions on the cell surface on the hot spot shunt side. This is an index of the micro-regions on the cell surface on the non-hot spot shunt side.

[0033] S3: Adjust the opening of the outlet proportional valve of the liquid cooling plate according to the load ratio of the hot spot shunt side, and open the pixel bypass micro-valve of the hot spot position and the micro-area of ​​the adjacent cell surface. When the hot spot intensity exceeds the preset intensity threshold, the air duct is opened. At the same time, the opening of the outlet proportional valve, the status of the pixel bypass micro-valve and the direction of the air duct are recorded as execution parameters.

[0034] S3.1: Collect the upper and lower limits of the liquid cooling plate opening. Use the average of the upper and lower limits as the opening benchmark. Collect the maximum historical hot spot shunt side load percentage as the maximum proportional offset. Calculate the maximum opening offset using the maximum proportional offset, the opening benchmark, the upper and lower limits, as shown in the following expression: ; in, For maximum opening offset, This indicates taking the minimum value. This is the upper limit of the opening. As the opening reference, This is the lower limit of the opening. This is the maximum proportional bias.

[0035] It should also be noted that the maximum value of the historical hot spot shunt side load ratio is obtained by collecting the historical temperature of the micro-area on the surface of each cell during the actual operation of the battery pack, and calculating the historical hot spot shunt side load ratio according to steps S1.1 to S2.2.

[0036] The maximum proportional bias range is [0.55, 0.85], because [0.55, 0.85] can simultaneously satisfy "effective bias on the hot spot shunt side" and "no excessive cooling on the non-hot spot shunt side". Values ​​greater than 0.85 are prone to insufficient coolant on the non-hot spot shunt side, resulting in increased temperature difference, local overheating, or overall temperature field imbalance. Values ​​less than 0.55 make it difficult to enrich coolant on the hot spot shunt side, resulting in slower hot spot cooling response and difficulty in timely convergence of hot spot intensity.

[0037] When the maximum percentage of the load on the shunt side of the historical hot spot is less than 0.55, the maximum proportional offset is set to 0.55. When the maximum percentage of the load on the shunt side of the historical hot spot is greater than 0.85, the maximum proportional offset is set to 0.85.

[0038] The opening of the proportional valve at the outlet of the hot spot splitter side and the opening of the proportional valve at the outlet of the non-hot spot splitter side are calculated using the load ratio on the hot spot splitter side, the maximum opening offset, and the opening reference, respectively. The expressions are as follows: ; ; in, The opening degree of the proportional valve at the outlet of the hot spot splitter side. For the opening degree of the proportional valve at the outlet of the non-hot spot diversion side, As the opening reference, For maximum opening offset, This represents the load percentage on the hot spot shunt side.

[0039] S3.2: Adjust the opening of the outlet proportional valve of the liquid cooling plate according to the opening of the outlet proportional valve on the hot spot diversion side and the non-hot spot diversion side.

[0040] Based on historical hot spot intensity, the percentile method is used to set the bypass threshold and intensity threshold. For example, the historical hot spot intensity is arranged from smallest to largest, and the historical hot spot intensity at the 90th percentile is selected as the bypass threshold, and the historical hot spot intensity at the 95th percentile is selected as the intensity threshold.

[0041] The 90th percentile was chosen because it allows the bypass to intervene promptly when hot spots begin to form, avoiding frequent activation that would increase voltage drop and energy consumption. If the threshold is too high, the pixel bypass micro-valve on the surface of adjacent cells will not open in time, resulting in delayed cooling of the hot spot neighborhood. If the threshold is too low, the pixel bypass micro-valve on the surface of adjacent cells will open frequently, increasing voltage drop and energy consumption and potentially amplifying unnecessary local overcooling.

[0042] The 95th percentile was chosen because it limits the operation of the air duct to the thermal shock or high-risk phase, reducing energy consumption, noise, and environmental adaptability issues caused by frequent opening. If the 95th percentile is too high, the air duct will open late, making it difficult to obtain the composite heat dissipation gain in time during the thermal shock phase. If the 95th percentile is too low, the air duct will open too early or too frequently, resulting in additional energy consumption, noise, and dust entry risks, and may cause unnecessary temperature fluctuations.

[0043] When the hot spot intensity is not lower than the bypass threshold, the pixel bypass micro-valve of the hot spot position and the micro-area on the surface of the adjacent cell is opened. When the hot spot intensity is not lower than the intensity threshold, the air duct opening operation is performed to blow the airflow towards the hot spot position.

[0044] Record the opening degree of the proportional valve at the outlet of the hot spot diversion side, the opening degree of the proportional valve at the outlet of the non-hot spot diversion side, the status of the pixel bypass microvalve, and the direction of the air duct as execution parameters.

[0045] The state of the pixel bypass micro-valve refers to whether the pixel bypass micro-valve is open or closed, and the direction of the air duct refers to the index of the micro-area on the surface of the cell corresponding to the hot spot position.

[0046] The pixel bypass micro-valve is a miniature valve arranged on the bypass branch of the local flow channel of the liquid cooling plate. It is used to control the bypass on / off of the flow channel of the corresponding micro-area on the surface of the battery cell and adjust the local coolant flow rate of the micro-area on the surface of the battery cell.

[0047] S4: Use the cooling circuit flow rate under the execution parameters to determine the flow health status of the cooling circuit, and obtain either normal or abnormal flow health status. When the circuit is abnormal, the preset emergency strategy is activated.

[0048] S4.1: Use a flow sensor to collect the cooling circuit flow rate under the execution parameters as the measured flow rate value, take the micro-area temperature value of the cell surface corresponding to the hot spot location as the hot spot temperature, collect historical hot spot temperatures and corresponding historical cooling circuit flow rates, and form a temperature-flow rate table.

[0049] It should also be noted that the historical hot spot temperature is obtained by collecting the historical temperature of the micro-area on the surface of each cell during the actual operation of the battery pack, and determining the location of the historical hot spot according to steps S1.1 and S1.2.

[0050] Historical temperatures and corresponding historical cooling circuit flow rates are collected synchronously by temperature sensors and flow sensors, respectively, and stored in the battery management center.

[0051] Arrange the temperature-flow meters in ascending order of historical hot spot temperature. Divide the historical hot spot temperatures into 20 hot spot temperature intervals according to the number of hot spots, forming hot spot temperature intervals and corresponding flow intervals. Associate the hot spot temperature intervals with the corresponding flow intervals to obtain the temperature interval-flow interval table.

[0052] The temperature range is divided into 20 hotspot temperature intervals because this balances the interval resolution with the sample size per interval. This ensures that the temperature interval-flow interval table is sufficiently detailed without becoming unstable. If the interval is too large, the historical sample size within a single hotspot temperature interval will be insufficient, leading to greater fluctuations in the corresponding flow interval. This would result in an unstable temperature interval-flow interval table and reduce the reliability of flow health assessment. If the interval is too small, the temperature segmentation will be too coarse, causing normal flow rates corresponding to different hotspot temperatures to be mixed in the same interval. This would dull the flow health assessment threshold and reduce the sensitivity to abnormal flow deviations.

[0053] The normal flow range is determined by looking up the corresponding flow range from the temperature range-flow range table using the hot spot temperature. When the measured flow value is within the normal flow range, the flow health status is determined to be normal. When the measured flow value exceeds the normal flow range, the flow health status is determined to be abnormal.

[0054] S4.2: When the current flow health status is normal, keep the execution parameters unchanged; when the current flow health status is abnormal, execute the preset emergency strategy.

[0055] The preset emergency strategy is as follows: when the measured flow rate is lower than the lower limit of the normal flow rate range and the hot spot intensity increases, the opening of the proportional valve at the outlet of the hot spot diversion side and the opening of the proportional valve at the outlet of the non-hot spot diversion side are both adjusted to the opening reference. The state of the pixel bypass microvalve corresponding to the hot spot position is set to open. The state of the pixel bypass microvalve of the micro-area on the surface of the cell adjacent to the hot spot position is set to closed. The air duct opening operation is set to the execution state. The direction of the air duct is set to the index of the micro-area on the surface of the cell corresponding to the hot spot position.

[0056] When the measured flow rate is lower than the lower limit of the normal flow range and the hot spot intensity is higher than the relative temperature difference of the micro-area on the surface of the adjacent cell, the opening degree of the proportional valve at the outlet of the hot spot diversion side is increased to no less than the opening degree reference. The state of the pixel bypass micro-valve corresponding to the hot spot position and the adjacent micro-area on the surface of the cell is set to open. The air duct opening operation is set to the execution state. The direction of the air duct is set to the index of the micro-area on the surface of the cell corresponding to the hot spot position.

[0057] S5: Use the cooling circuit flow rate and hot spot intensity under the preset emergency strategy to determine the recovery status of the circuit and obtain either a recovery or non-recovery result. If the result is recovery, cool down according to the execution parameters. If the result is non-recovery, maintain the preset emergency strategy.

[0058] S5.1: Use a flow sensor to collect the cooling circuit flow rate under the preset emergency strategy as the recovery judgment flow rate value, and use a temperature sensor to collect the temperature of the micro-area on the surface of the cell under the preset emergency strategy as the recovery temperature.

[0059] The cell surface micro-area temperature value under the preset emergency strategy is calculated using the recovery temperature according to steps S1.1 and S1.2, and the hot spot location and hot spot intensity under the preset emergency strategy are determined.

[0060] The cell surface micro-area temperature value corresponding to the hot spot location under the preset emergency strategy is used as the recovery judgment hot spot temperature. The normal flow range corresponding to the temperature range-flow range table is queried using the recovery judgment hot spot temperature as the normal judgment flow range.

[0061] When the recovery judgment flow value is within the normal judgment flow range, the flow is judged to be recovered. When the recovery judgment flow value exceeds the normal judgment flow range, the flow is judged not to be recovered. When the recovery judgment hot spot intensity is lower than the hot spot intensity of the previous moment, the hot spot intensity is judged to be recovered. When the recovery judgment hot spot intensity is not lower than the hot spot intensity of the previous moment, the hot spot intensity is judged not to be recovered.

[0062] The circuit is deemed to have recovered only when both flow rate and hot spot intensity are restored. The preset emergency strategy is then exited, and cooling is performed according to the execution parameters. If neither flow rate nor hot spot intensity is restored, the circuit is deemed to have recovered, and the preset emergency strategy is maintained.

[0063] This embodiment also provides a computer device applicable to the adaptive control method of liquid cooling plate flow channel based on micro-region temperature difference feedback on the surface of the battery cell, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to realize the adaptive control method of liquid cooling plate flow channel based on micro-region temperature difference feedback on the surface of the battery cell as proposed in the above embodiment.

[0064] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0065] This embodiment also provides a storage medium storing a computer program. When executed by a processor, the program implements the adaptive control method for liquid cooling plate flow channels based on micro-area temperature difference feedback on the surface of the battery cell, as proposed in the above embodiment. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0066] In summary, this invention achieves refined flow redistribution for areas with concentrated heat loads by smoothing the micro-area temperature sequence and calculating the relative temperature difference, thereby improving the timeliness and spatial resolution of hot spot suppression, reducing peak temperature and temperature gradient, and solving the problem of lag in hot spot suppression. In addition, by establishing a temperature-flow correlation table based on historical hot spot temperatures and corresponding flow rates and dividing normal flow ranges, it enables online identification of the loop flow health status, maintains a controllable cooling path in the case of flow degradation, reduces the risk of overheating under abnormal operating conditions, and solves the problem of difficulty in timely identification of loop anomalies.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface, characterized in that: include, Collect the surface micro-area temperature of the battery cell and the flow rate of the cooling circuit, smooth the surface micro-area temperature of the battery cell, calculate the relative temperature difference of the surface micro-area of ​​the battery cell, and determine the location and intensity of the hot spot; Based on the location of the hot spot, the micro-regions on the surface of the cell are merged to obtain the hot spot shunt side. The load ratio of the hot spot shunt side is calculated using the relative temperature difference of the micro-regions on the surface of the cell. Adjust the opening of the outlet proportional valve of the liquid cooling plate according to the load ratio of the hot spot shunt side, and open the pixel bypass micro valve of the hot spot position and the micro area of ​​the adjacent cell surface. When the hot spot intensity exceeds the preset intensity threshold, the air duct is opened. At the same time, the opening of the outlet proportional valve, the state of the pixel bypass micro valve and the direction of the air duct are recorded as execution parameters. The flow health status of the cooling circuit is determined by the cooling circuit flow rate under the execution parameters, and either the circuit is normal or the circuit is abnormal. When the circuit is abnormal, the preset emergency strategy is activated. The recovery status of the circuit is determined by the cooling circuit flow rate and hot spot intensity under the preset emergency strategy, and either the circuit is recovered or not recovered is obtained. If the result is recovered, the circuit is cooled according to the execution parameters. If the result is not recovered, the preset emergency strategy is maintained.

2. The method of claim 1, wherein the method is characterized by: The specific steps for smoothing the temperature of the micro-regions on the surface of the battery cell are as follows. Temperature sensors are used to collect the temperature of a micro-area on the surface of each cell, and flow sensors are used to collect the flow rate of the cooling circuit. Calculate the average temperature of each cell surface micro-region with the temperature of the cell surface micro-region at the previous moment, and use it as the cell surface micro-region temperature value.

3. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The specific steps for determining the location and intensity of the hot spot are as follows: The reference temperature is set based on the temperature value of the micro-region on the surface of the battery cell. The relative temperature difference of each micro-region on the surface of the battery cell is calculated using the micro-region temperature value on the surface of the battery cell and the reference temperature. The micro-region on the surface of the battery cell with the largest relative temperature difference is taken as the hot spot location, and the corresponding relative temperature difference is taken as the hot spot intensity.

4. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The method of merging the micro-regions on the cell surface according to the hot spot location refers to setting the liquid cooling plate as a bidirectional flow-diverting condition with central liquid inlet, dividing the micro-regions on the cell surface on the side where the hot spot is located into the hot spot flow-diverting side, and dividing the micro-regions on the cell surface on the side that does not contain the hot spot into the non-hot spot flow-diverting side.

5. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The specific steps for calculating the load ratio on the hot spot shunt side using the relative temperature difference of micro-regions on the cell surface are as follows: The micro-regions on the cell surface with a non-negative relative temperature difference on the hot spot shunt side are defined as the hot spot hot region, and the micro-regions on the cell surface with a non-negative relative temperature difference on the non-hot spot shunt side are defined as the non-hot spot hot region. The sum of the relative temperature differences corresponding to the hot spot hot zone is taken as the hot spot heat load, and the sum of the relative temperature differences corresponding to the non-hot spot hot zone is taken as the non-hot spot heat load. The total heat load is calculated by taking the heat load of hot spots and the heat load of non-hot spots, and the ratio of the heat load of hot spots to the total heat load is taken as the load proportion of the hot spot shunt side.

6. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The specific steps for adjusting the outlet proportional valve opening of the liquid cooling plate according to the load ratio on the hot spot shunt side are as follows: Collect the upper and lower limits of the liquid cooling plate opening, and use the average of the upper and lower limits as the opening benchmark; Collect the maximum historical hot spot shunt side load percentage as the maximum proportional bias; The maximum opening offset is calculated using the maximum proportional offset, the opening reference, the upper limit of the opening, and the lower limit of the opening. The opening of the outlet proportional valve of the liquid cooler plate is adjusted based on the load ratio of the hot spot shunt side, the maximum opening offset, and the opening reference.

7. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 6, characterized in that: The adjustment of the outlet proportional valve opening of the liquid cooling plate based on the hot spot shunt side load ratio, maximum opening offset, and opening reference involves the following steps: The opening degree of the proportional valve at the outlet of the hot spot shunt side and the opening degree of the proportional valve at the outlet of the non-hot spot shunt side are calculated using the load ratio of the hot spot shunt side, the maximum opening degree offset, and the opening degree reference, respectively. The opening of the outlet proportional valve of the liquid cooler is adjusted according to the opening of the outlet proportional valve on the hot spot split side and the outlet proportional valve on the non-hot spot split side.

8. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The steps for determining the flow health status of the cooling circuit using the cooling circuit flow rate under the execution parameters are as follows: The flow rate of the cooling circuit under the execution parameters is collected using a flow sensor as the measured flow rate value. The temperature of the micro-area on the cell surface corresponding to the hot spot location is taken as the hot spot temperature. By correlating historical hotspot temperatures with corresponding historical cooling loop flow rates, a temperature-flow rate table is created. Arrange the temperature-flow meters in ascending order of historical hot spot temperature, and then divide the temperature-flow meters into hot spot temperature ranges and flow ranges evenly according to the number of historical hot spot temperatures, forming a temperature range-flow range table. Use the hot spot temperature to look up the corresponding flow range from the temperature range-flow range table as the normal flow range; When the measured flow rate is within the normal flow rate range, the flow health status is determined to be normal. When the measured flow rate exceeds the normal flow rate range, the flow health status is determined to be abnormal.

9. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The specific steps for activating the preset emergency strategy when the circuit malfunctions are as follows: When the circuit is normal, the execution parameters remain unchanged; When the circuit is abnormal, adjust the opening of the proportional valve at the outlet of the hot spot shunt side and the opening of the proportional valve at the outlet of the non-hot spot shunt side to the opening reference. Set the state of the pixel bypass microvalve corresponding to the hot spot location to open; Set the state of the pixel bypass micro-valve in the micro-area of ​​the cell surface adjacent to the hot spot to closed; Set the air duct opening operation to the execution state, and set the direction of the air duct to the index of the micro-region on the surface of the cell corresponding to the hot spot position.

10. The adaptive control method for liquid cooling plate flow channels based on micro-region temperature difference feedback on the cell surface as described in claim 1, characterized in that: The recovery status of the cooling circuit is determined using the cooling circuit flow rate and hot spot intensity under a preset emergency strategy. The specific steps are as follows: The flow rate of the cooling circuit under the preset emergency strategy is collected by a flow sensor as the recovery judgment flow rate value; The temperature of the micro-area on the surface of the battery cell under the preset emergency strategy is collected by a temperature sensor as the recovery temperature; The recovery temperature is used to calculate the micro-area temperature value on the cell surface under the preset emergency strategy, and to determine the hot spot location and hot spot intensity under the preset emergency strategy. The hot spot intensity under the preset emergency strategy is used as the hot spot intensity for recovery judgment; The temperature value of the micro-area on the cell surface corresponding to the hot spot location under the preset emergency strategy is used as the hot spot temperature for recovery judgment. Use the recovery judgment hotspot temperature to look up the corresponding normal flow range from the temperature range-flow range table, and use it as the normal judgment flow range. When the recovery judgment traffic value is within the normal judgment traffic range, the traffic is judged to have recovered; when the recovery judgment traffic value exceeds the normal judgment traffic range, the traffic is judged not to have recovered. When the hot spot intensity is determined to be lower than the hot spot intensity at the previous moment, the hot spot intensity is determined to have recovered; when the hot spot intensity is determined to be not lower than the hot spot intensity at the previous moment, the hot spot intensity is determined not to have recovered. When both flow rate and hot spot intensity recover, the recovery status of the determination loop is considered recovered; when neither flow rate nor hot spot intensity recovers, the recovery status of the determination loop is considered unrecovered.

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