Method and apparatus for determining the power limit value of a power battery

Abstract

This invention discloses a method and apparatus for determining the power limit value of a power battery. The method includes: acquiring target operating condition data of the vehicle; determining a first power limit ratio value of the power battery in a pulse temperature rise table based on a first temperature value and the target temperature value of the power battery; determining a second power limit ratio value of the power battery based on the vehicle's power performance target data and target evaluation data; determining the minimum value between the first and second power limit ratio values ​​as the target power limit ratio value of the power battery; and determining the power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery. This invention solves the technical problems that high-temperature power limit protection methods for batteries cannot cover operating conditions with fast vehicle speed response, and cannot simultaneously consider the safety of battery and vehicle use, vehicle power performance, and user experience.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more specifically, to a method and apparatus for determining the power limit value of a power battery. Background Technology

[0002] Currently, most new energy vehicles on the market use lithium-ion batteries, whose performance is highly sensitive to temperature changes. The battery's discharge energy, output power, and charging current will vary at different temperatures, affecting the vehicle's power, economy, and charging time. When the battery temperature is too high, regardless of the operating conditions or the battery's temperature response, the thermal management system is generally activated to cool the battery. However, this method is only suitable for operating conditions where the battery temperature response is not too drastic. For operating conditions where the battery power and temperature response are extremely fast, this method is not applicable because the thermal management system cannot quickly cool the battery in a short period of time.

[0003] Existing technologies employ power limiting strategies to cool batteries. However, these strategies are primarily designed to prevent voltage exceedances, rather than controlling battery temperature. While this approach can control battery temperature rise to some extent, it can also negatively impact vehicle performance and user experience.

[0004] There is currently no effective solution to the technical problems that the above-mentioned high-temperature power limiting protection methods for batteries cannot cover operating conditions with fast vehicle speed response, and cannot simultaneously take into account the safety of battery and vehicle use, vehicle power performance and user experience. Summary of the Invention

[0005] This invention provides a method and apparatus for determining the power limit value of a power battery, thereby addressing the technical problems that high-temperature power limit protection methods for batteries cannot cover operating conditions with fast vehicle speed response, and cannot simultaneously consider the safety of battery and vehicle use, vehicle power performance, and user experience.

[0006] According to one aspect of the present invention, a method for determining a power limit value of a power battery is provided. The method may include: acquiring target operating condition data of a vehicle, wherein the target operating condition data is used to characterize operating condition data where the temperature value of the power battery during vehicle operation is higher than a preset temperature value, and the average power response speed of the vehicle during vehicle operation is higher than a preset average power response speed; the target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value; determining a first power limit ratio value of the power battery in a pulse temperature rise table based on the first temperature value and the target temperature value of the power battery; determining a second power limit ratio value of the power battery based on target power performance data and target evaluation data of the vehicle; determining the minimum value between the first power limit ratio value and the second power limit ratio value as the target power limit ratio value of the power battery; and determining a power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery.

[0007] Optionally, acquiring target operating condition data of the vehicle includes: acquiring historical operating condition data of the vehicle; and acquiring target operating condition data in response to data in the historical operating condition data where the temperature value of the power battery is higher than a preset temperature value and the average power response speed is higher than a preset average power response speed.

[0008] Optionally, before determining the first power limit ratio of the power battery in the pulse temperature rise table based on the first temperature value and the target temperature value of the power battery, the method further includes: when the target operating condition data are the first temperature value and the first remaining charge value, determining multiple power limit values ​​corresponding to the allowable power value under multiple power limit ratio values ​​based on the allowable power value of the vehicle; determining a second temperature value of the power battery corresponding to each power limit value based on each power limit value, wherein the second temperature value is used to characterize the degree of temperature rise of the power battery when the power battery is charged or discharged based on each power limit value; and plotting the first temperature value, the first remaining charge value, the multiple power limit ratio values, and the second temperature value of the power battery corresponding to each power limit ratio value to obtain a pulse temperature rise table.

[0009] Optionally, based on the first temperature value and the target temperature value of the power battery, a first power limit ratio value of the power battery is determined in the pulse temperature rise table, including: a search step, based on the first temperature value, searching the pulse temperature rise table to obtain a second temperature value corresponding to each power limit ratio value; a determination step, determining the sum between the first temperature value and the second temperature value as the first temperature value, until the first temperature value is reached for a preset number of times; and determining the first power limit ratio value based on multiple first temperature values ​​and the target temperature value.

[0010] Optionally, determining a first power limiting ratio value based on multiple first temperature values ​​and a target temperature value includes: when multiple first temperature values ​​corresponding to a third power limiting ratio value among multiple power limiting ratio values ​​are all less than the target temperature value, and when any one of the multiple first temperature values ​​corresponding to a fourth power limiting ratio value among multiple power limiting ratio values ​​is greater than the target temperature value, the third power limiting ratio value is determined as the first power limiting ratio value, wherein the third power limiting ratio value is used to characterize that the first temperature value corresponding to any one of the multiple power limiting ratio values ​​is less than the largest power limiting ratio value among the target temperature values.

[0011] Optionally, determining the power limit value of the power battery based on the target power limit ratio and the allowable power value of the power battery includes: determining the power limit value as the product between the target power limit ratio and the allowable power value.

[0012] According to one aspect of the present invention, an apparatus for determining a power limit value of a power battery is provided. The apparatus may include: an acquisition unit, configured to acquire target operating condition data of a vehicle, wherein the target operating condition data is used to characterize operating condition data where the temperature value of the power battery during vehicle operation is higher than a preset temperature value, and the average power response speed of the vehicle during vehicle operation is higher than a preset average power response speed; the target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value; a first processing unit, configured to determine a first power limit ratio value of the power battery in a pulse temperature rise table based on the first temperature value and the target temperature value of the power battery; a first determining unit, configured to determine a second power limit ratio value of the power battery based on target power performance data and target evaluation data of the vehicle; a second determining unit, configured to determine the minimum value between the first power limit ratio value and the second power limit ratio value as the target power limit ratio value of the power battery; and a third determining unit, configured to determine a power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery.

[0013] According to another aspect of the present invention, a computer-readable storage medium is also provided. The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method for determining a power limit value of a power battery according to the embodiments of the present invention.

[0014] According to another aspect of the present invention, a processor is also provided. The processor is configured to run a program, wherein the program, when running, executes the method for determining a power limit value for a power battery according to the embodiments of the present invention.

[0015] According to another aspect of the present invention, a vehicle is also provided, which is used to perform the method of determining the power limit value of a power battery according to the embodiments of the present invention.

[0016] In this embodiment of the invention, by obtaining the first temperature value of the target operating condition data and the existing target temperature value, a pulse temperature rise table is consulted to obtain a first power limit ratio value. Based on the vehicle's power performance target data and target evaluation data, a second power limit ratio value is determined. The minimum value between the first power limit ratio value and the second power limit ratio value is determined as the target power limit ratio value. The allowable power value is limited by the target power limit ratio value to obtain the power limit value. This achieves the goal of ensuring safe vehicle operation by controlling the allowable power value of the vehicle's power battery under typical operating conditions. It solves the technical problems that the battery high-temperature power limit protection method cannot cover operating conditions with fast vehicle speed response and cannot simultaneously take into account the safety of battery and vehicle use, vehicle power performance, and user experience. It achieves the technical effect of the battery high-temperature power limit protection method covering operating conditions with fast vehicle speed response and simultaneously taking into account the safety of battery and vehicle use, vehicle power performance, and user experience. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a flowchart of a method for determining the power limit value of a power battery according to an embodiment of the present invention;

[0019] Figure 2 This is a flowchart of a high-temperature power limiting protection method for a power battery according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a high-temperature power limiting protection system for a power battery according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of an apparatus for determining the power limit value of a power battery according to an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Example 1

[0025] According to an embodiment of the present invention, a method for determining the power limit value of a power battery is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0026] Figure 1 This is a flowchart of a method for determining the power limit value of a power battery according to an embodiment of the present invention, such as... Figure 1 As shown, the method may include the following steps:

[0027] Step S101: Obtain target operating condition data of the vehicle. The target operating condition data is used to characterize the operating condition data where the temperature value of the power battery is higher than the preset temperature value and the average power response speed of the vehicle is higher than the preset average power response speed during driving. The target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value.

[0028] In the technical solution provided by step S101 of the present invention, the vehicle target operating condition data obtained from the cloud includes typical operating condition data. Typical operating condition data can be operating condition data in which the temperature of the vehicle's power battery increases and the average power response speed increases during the sudden acceleration or deceleration of the vehicle, resulting in the vehicle being unable to drive normally. The target operating condition data includes the time of sudden acceleration and deceleration of the vehicle, the temperature value of the power battery, the power value required by the power battery during sudden acceleration and deceleration of the vehicle, the voltage value of the power battery, and the current value of the power battery.

[0029] Step S102: Based on the first temperature value and the target temperature value of the power battery, determine the first power limit ratio value of the power battery in the pulse temperature rise table.

[0030] In the technical solution provided by step S102 of the present invention, based on the first temperature value in the target operating condition data, the established pulse temperature rise table is searched to obtain multiple first temperature values ​​under multiple power limit ratio values. Based on the relationship between the multiple first temperature values ​​under multiple power limit ratio values ​​and the target temperature value of the power battery, one of the multiple power limit ratio values ​​is determined as the first power limit ratio value of the power battery.

[0031] Step S103: Based on the vehicle's power performance target data and target evaluation data, determine the second power limit ratio value of the power battery.

[0032] In the technical solution provided by step S103 of the present invention, the third power limit ratio value that meets the acceleration and deceleration time of the vehicle is determined under different initial temperatures and remaining charge (SOC) conditions of the vehicle's power battery. Under the premise that the vehicle's power performance and driving safety are not affected, and the power limit ratio value is greater than or equal to the third power limit ratio value, subjective evaluation and calibration are carried out through whole vehicle testing. For different initial temperatures and SOC, the user experience under different power limit ratio conditions is evaluated, and then a second power limit ratio value that does not affect the user experience under different initial temperatures and SOC conditions is determined.

[0033] For example, a third power limit ratio of 50% is determined to meet the vehicle's acceleration and deceleration time targets under initial temperature of 45℃ and 50% SOC. Subjective evaluation and calibration are conducted through whole-vehicle testing to evaluate the user experience under different power limit ratios at 45℃ and 50% SOC, thereby determining the maximum power limit ratio of 60% that does not affect the user experience under 45℃ and 50% SOC conditions.

[0034] Step S104: The minimum value between the first power limit ratio value and the second power limit ratio value is determined as the target power limit ratio value of the power battery.

[0035] In the technical solution provided by step S104 of the present invention, by judging the magnitude of the first power limit ratio value and the second power limit ratio value, the minimum value between the first power limit ratio value and the second power limit ratio value is determined as the target power limit ratio value under the first temperature value and the first remaining power condition.

[0036] Step S105: Determine the power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery.

[0037] In the technical solution provided by step S105 of the present invention, the allowable power value of the power battery is used as a reference, and the allowable power value of the power battery is controlled by the target power limit ratio value to determine the power limit value of the power battery under the conditions of the first temperature value and the first remaining charge value.

[0038] In steps S101 to S105 of this application, a first power limit ratio is obtained by searching a pulse temperature rise table using the first temperature value of the acquired target operating condition data and existing target temperature values. A second power limit ratio is then determined based on the vehicle's power performance target data and target evaluation data. The minimum value between the first and second power limit ratios is determined as the target power limit ratio. The allowable power value is then limited by the target power limit ratio to obtain the power limit value. This achieves the goal of ensuring safe vehicle operation by controlling the allowable power value of the vehicle's power battery under typical operating conditions. It solves the technical problems of battery high-temperature power limit protection methods failing to cover operating conditions with rapid vehicle speed response and failing to simultaneously consider battery and vehicle safety, vehicle power performance, and user experience. The method achieves the technical effect of covering operating conditions with rapid vehicle speed response while simultaneously considering battery and vehicle safety, vehicle power performance, and user experience.

[0039] The method described in this embodiment will be further described below.

[0040] As an optional embodiment, step S101, obtaining the target operating condition data of the vehicle, includes: obtaining the historical operating condition data of the vehicle; in response to data in the historical operating condition data where the temperature value of the power battery is higher than a preset temperature value and the average power response speed is higher than a preset average power response speed, obtaining the target operating condition data.

[0041] In this embodiment, historical operating condition data of the vehicle previously stored in the cloud is obtained from the cloud database. The historical operating condition data includes data where the temperature of the vehicle's power battery is greater than or equal to a preset temperature value and the average power response speed is greater than or equal to a preset average power response speed, enabling the vehicle to drive normally; and data where the temperature of the vehicle's power battery is less than the preset temperature value and the average power response speed is less than the preset average power response speed, preventing the vehicle from driving normally. The data where the temperature of the power battery is greater than or equal to the preset temperature value and the average power response speed is greater than or equal to the preset average power response speed are extracted from the historical operating condition data to obtain the target operating condition data of the vehicle.

[0042] As an optional embodiment, in step S102, before determining the first power limit ratio value of the power battery in the pulse temperature rise table based on the first temperature value and the target temperature value of the power battery, the method further includes: when the target operating condition data are the first temperature value and the first remaining charge value, determining multiple power limit values ​​corresponding to the allowable power value under multiple power limit ratio values ​​based on the allowable power value of the vehicle; determining a second temperature value of the power battery corresponding to each power limit value based on each power limit value, wherein the second temperature value is used to characterize the degree of temperature rise of the power battery when the power battery is charged or discharged based on each power limit value; and plotting the first temperature value, the first remaining charge value, the multiple power limit ratio values, and the second temperature value of the power battery corresponding to each power limit ratio value to obtain a pulse temperature rise table.

[0043] In this embodiment, based on any ternary lithium battery cell, the upper and lower limits of the safe operating voltage of the battery cell are defined, along with the voltage margin corresponding to the upper and lower limits of the safe operating voltage, to obtain the upper and lower limits of the safe voltage considering the voltage margin. Under the premise that the upper and lower limits of the safe voltage do not reach the voltage margin, multiple power limit values ​​corresponding to the allowable power value of the battery cell under different power limit ratios are obtained. Based on the first voltage value and the first remaining charge value, the power battery is tested for a fixed time under multiple power limit values, and the corresponding temperature rise is obtained. A table is plotted on the first voltage value, the first remaining charge value, different power limit ratios, and the temperature rise corresponding to different power limit ratios, to obtain a pulse temperature rise table.

[0044] For example, using the allowable power of a single battery cell over 10 seconds as a benchmark, the temperature rise of the power battery under 45℃ and 50% SOC conditions, with the power limitation ratio ranging from 10% to 100%, is tested. When the allowable discharge power of a single battery cell under 45℃ and 50% SOC conditions over 10 seconds is 700W, the power limitation values ​​(in W) corresponding to each 10% interval from 10% to 100% are calculated as follows: 70, 140, 210, 280, 350, 420, 490, 560, 630, and 700. Each of these power limitation values ​​is then discharged at constant power for 10 seconds, and the corresponding temperature rise is obtained.

[0045] As an optional embodiment, step S103, based on the first temperature value and the target temperature value of the power battery, determines the first power limit ratio value of the power battery in the pulse temperature rise table, including: a search step, based on the first temperature value, searching the pulse temperature rise table to obtain the second temperature value corresponding to each power limit ratio value; a determination step, determining the sum between the first temperature value and the second temperature value as the first temperature value, until the first temperature value is reached for a preset number of times; and determining the first power limit ratio value based on multiple first temperature values ​​and the target temperature value.

[0046] In this embodiment, based on the first temperature value, a pulse temperature rise table is consulted to obtain multiple temperature rise values ​​at different power limit ratios for the first temperature value. The sum of the multiple temperature rise values ​​and the first temperature value is determined as a new first temperature value. Based on the new first temperature value, the pulse temperature rise table is consulted again to obtain multiple temperature rise values ​​at different power limit ratios for the updated first temperature value. The sum of the multiple temperature rise values ​​and the new first temperature value is determined as yet another new first temperature value. This process is repeated until the first temperature value is determined a preset number of times, which can be 5 times. The multiple first temperature values, the target temperature value, and the first power limit ratio value are then determined.

[0047] As an optional embodiment, determining a first power limiting ratio value based on multiple first temperature values ​​and a target temperature value includes: when multiple first temperature values ​​corresponding to a third power limiting ratio value among multiple power limiting ratio values ​​are all less than the target temperature value, and when any one of the multiple first temperature values ​​corresponding to a fourth power limiting ratio value among multiple power limiting ratio values ​​is greater than the target temperature value, the third power limiting ratio value is determined as the first power limiting ratio value, wherein the third power limiting ratio value is used to characterize that the first temperature value corresponding to any one of the multiple power limiting ratio values ​​is less than the largest power limiting ratio value among the target temperature values.

[0048] In this embodiment, if all first temperature values ​​under the third power limit ratio value are less than the target temperature value, and any one of the first temperature values ​​corresponding to the fourth power limit ratio value under the multiple power limit ratio values ​​is greater than the target temperature value, the third power limit ratio value is determined as the first power limit ratio value, and the third power limit ratio value is the largest power ratio value among the multiple power ratio values ​​where all first temperature values ​​are less than the target temperature value.

[0049] For example, taking 45℃ and 50% SOC as an example, the first cycle is calculated by looking up a table at the initial 45℃, resulting in a 0.5℃ temperature rise for the battery at a 30% power limit. The second cycle is calculated by looking up a table at 45.5℃, and through linear interpolation, a 0.52℃ temperature rise is obtained for a single cycle at a 30% power limit. The third cycle is calculated by looking up a table at 46.02℃, and so on. Finally, a pulse end-of-cycle temperature table is integrated for different cycle numbers. Based on the target power limit of 55℃, and according to the end-of-cycle temperature table calculations, the first power limit corresponding to 45℃ and 50% SOC is 80%.

[0050] As an optional embodiment, step S105, determining the power limit value of the power battery based on the target power limit ratio and the allowable power value of the power battery, includes: determining the power limit value as the product between the target power limit ratio and the allowable power value.

[0051] In this embodiment, the power limit value of the power battery is obtained by multiplying the target power limit ratio value by the allowable power value.

[0052] In this embodiment of the invention, historical operating condition data of the vehicle is acquired; data from the historical operating condition data where the temperature value of the power battery is higher than a preset temperature value and the average power response speed is higher than a preset average power response speed are extracted to obtain target operating condition data; based on a first temperature value, a first remaining charge value, and multiple power limit values, the temperature rise corresponding to different power limit values ​​is obtained, and a pulse table is plotted; based on the first temperature value and the target temperature value of the power battery, the pulse temperature rise table is searched to obtain a first power limit ratio value; based on the first power limit ratio and the second power limit ratio value, a target power limit ratio value is determined; and the product between the target power limit ratio value and the allowable power value is determined as the power limit value. This solves the technical problem that the battery high-temperature power limit protection method cannot cover operating conditions with fast vehicle speed response and cannot simultaneously take into account the safety of battery and vehicle use, vehicle power performance, and user experience. It achieves the technical effect of the battery high-temperature power limit protection method covering operating conditions with fast vehicle speed response and simultaneously taking into account the safety of battery and vehicle use, vehicle power performance, and user experience.

[0053] Example 2

[0054] The technical solutions of the embodiments of the present invention will be illustrated below with reference to preferred embodiments.

[0055] With the increasing popularity of new energy vehicles, the power battery, as a crucial component of the three-electric system (battery, motor, and electronic control system) of new energy vehicles, is receiving growing attention from professionals and end-users regarding its safety, reliability, and durability. Currently, new energy vehicles primarily use lithium-ion batteries, whose performance is highly sensitive to temperature changes. The battery's discharge energy, output power, and charging current vary at different temperatures, affecting the vehicle's power, economy, and charging time. Furthermore, excessively high or low temperatures also impact battery lifespan. For pure electric vehicles, the power battery, as the sole power source, responds differently to varying load power and durations during vehicle operation. Particularly noteworthy is the rapid temperature rise during high-speed driving conditions. When the battery receives multiple consecutive high-power pulse discharges and charges within a short period, its temperature may rise sharply. The thermal management system may be unable to cool the battery quickly enough, and if the temperature rises too rapidly, reaching the battery's safe operating temperature limit, the battery and vehicle control systems will shut down the vehicle, rendering it unable to continue driving. Therefore, in order to ensure the safe operation of the vehicle, it is necessary to limit the allowable power of the battery to reduce the heat generated by the battery during operation, thereby reducing the temperature rise of the battery and avoiding the problem of vehicle power interruption due to a sharp increase in battery temperature, while ensuring the overall power economy and user experience of the vehicle.

[0056] Lithium-ion batteries are highly sensitive to temperature changes, with performance varying at different temperatures. Excessively high or low temperatures can negatively impact a vehicle's power economy, charging time, and reliability. In particular, excessively high battery temperatures can affect the safety of both the battery and the vehicle, necessitating intervention. Currently, regardless of operating conditions or battery temperature response, cooling is typically achieved by activating the thermal management system when the battery temperature is too high. However, this method is only suitable for conditions with relatively stable battery temperature responses. For conditions with extremely rapid battery power and temperature responses, this method is unsuitable because the thermal management system cannot quickly cool the battery within a short timeframe.

[0057] On the other hand, from the perspective of power limiting methods, commonly used power limiting strategies are generally designed with the primary goal of not exceeding the safe voltage, rather than controlling battery temperature. Although this method can control battery temperature rise to some extent, it will also affect vehicle performance and user experience.

[0058] However, embodiments of the present invention propose a method for high-temperature power limiting protection of power batteries. Figure 2 This is a flowchart of a method for high-temperature power limiting protection of a power battery according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method may include the following steps:

[0059] Step S201: Obtain historical operating condition data of the whole vehicle through cloud data, and extract typical operating condition data from the historical operating condition data.

[0060] Historical operating condition data of the entire vehicle is obtained through cloud data. This historical operating condition data needs to include information such as time, battery temperature, power, voltage, and current. The historical operating condition data is analyzed, with a focus on analyzing the average response speed of battery temperature and power. Operating conditions with high average response speeds of battery temperature and power are extracted as typical operating conditions. During these operating conditions, problems such as the vehicle being unable to drive normally due to a sharp increase in battery temperature are likely to occur. Based on these operating conditions, a typical operating condition database of battery high temperature power limitation is established.

[0061] Step S202: Based on the typical operating condition cycle coefficient and the upper limit threshold of the battery safety temperature, determine the corresponding power limitation ratio X1 of the battery under different initial temperatures and SOC conditions.

[0062] Based on the ternary lithium battery cell, the upper limit of the safe operating voltage V of the battery cell is defined. uplimit =4.4V, lower limit V downlimit＝ 2.5V and the corresponding voltage margin dU up =200mV, dU down=200mV. Based on this, the upper and lower limits of the safe voltage considering voltage margin are calculated to be 4.2V and 2.7V, respectively. Under the premise of not reaching the above-defined upper and lower limits of the safe voltage, pulse power tests are conducted on individual battery cells under different power limitation ratios based on different initial temperatures and SOCs to obtain the corresponding temperature rise. Specifically: First, the pulse time is determined based on the time of a single vehicle acceleration or deceleration, for example, 10s. Using the allowable power value of the battery cell in 10s as a benchmark, the temperature rise is tested under different SOC and temperature conditions with power limitation ratios from 10% to 100%. For example, the allowable discharge power of a battery cell in 10s at 45℃ and 50% SOC is 700W. The power limitation values ​​(in W) corresponding to each 10% interval from 10% to 100% are calculated as follows: 70, 140, 210, 280, 350, 420, 490, 560, 630, 700. Constant power discharge is performed for 10s using these power limitation values, and the corresponding temperature rise is obtained. Based on the above methods, temperature rise under other temperature and SOC conditions was tested. The SOC test points ranged from 100% to 5% (with intervals of 10% between 100% and 10%), and the temperature test points ranged from 50℃ to 25℃ (with intervals of 5℃). The temperature rise test method under charging conditions was similar. Based on the above test results, the correspondence between battery initial temperature, SOC, power limit ratio, and battery cell temperature rise was integrated. Based on different initial temperatures and SOCs, pulse temperature rise tables corresponding to the power limit ratio and battery cell temperature rise were formed to distinguish between charging and discharging. The specific application temperature range of the high-temperature power limit protection method was defined, for example, above 40℃. Based on the analysis results of vehicle historical operating condition data, the evaluation number of typical operating conditions was defined as 5, meaning that the battery strategy development needs to consider the usage scenario of completing 5 consecutive typical operating condition cycles. Based on the working characteristics of battery cells, the upper limit threshold of safe operating temperature was defined as 55℃, with a 5℃ safety margin reserved. The temperature threshold corresponding to vehicle power interruption was defined as 60℃.

[0063] Based on the temperature rise mentioned above, and considering the typical operating cycle number of 5 and the upper limit threshold of safe operating temperature of 55℃, the maximum power limit ratio X1 corresponding to different initial temperatures and SOC is determined. Taking 45℃ and 50% SOC as an example, the pulse temperature rise of a single battery cell under different power limitation ratios is as follows: when the power limitation ratio is 30%, the initial temperature is 45℃, and the temperature rise per cycle is 0.5℃; the initial temperature is 46℃, and the temperature rise per cycle is 0.54℃; the initial temperature is 47℃, and the temperature rise per cycle is 0.58℃; the initial temperature is 48℃, and the temperature rise per cycle is 0.62℃; the initial temperature is 49℃, and the temperature rise per cycle is 0.66℃; the initial temperature is 50℃, and the temperature rise per cycle is 0.70℃; the initial temperature is 51℃, and the temperature rise per cycle is 0.74℃; the initial temperature is 52℃, and the temperature rise per cycle is 0.78℃; the initial temperature is 53℃, and the temperature rise per cycle is 0.82℃; the initial temperature is 54℃, and the temperature rise per cycle is 0.86℃; and the initial temperature is 55℃, and the temperature rise per cycle is 0.90℃.

[0064] When the power limit ratio is 40%, the temperature rise per cycle is as follows: initial temperature 45℃, single cycle temperature rise 0.7℃; initial temperature 46℃, single cycle temperature rise 0.75℃; initial temperature 47℃, single cycle temperature rise 0.80℃; initial temperature 48℃, single cycle temperature rise 0.85℃; initial temperature 49℃, single cycle temperature rise 0.89℃; initial temperature 50℃, single cycle temperature rise 0.94℃; initial temperature 51℃, single cycle temperature rise 0.99℃; initial temperature 52℃, single cycle temperature rise 1.04℃; initial temperature 53℃, single cycle temperature rise 1.09℃; initial temperature 54℃, single cycle temperature rise 1.14℃; initial temperature 55℃, single cycle temperature rise 1.19℃.

[0065] When the power limit ratio is 50%, the temperature rise per cycle is as follows: initial temperature 45℃, single cycle temperature rise 0.9℃; initial temperature 46℃, single cycle temperature rise 0.96℃; initial temperature 47℃, single cycle temperature rise 1.01℃; initial temperature 48℃, single cycle temperature rise 1.07℃; initial temperature 49℃, single cycle temperature rise 1.13℃; initial temperature 50℃, single cycle temperature rise 1.19℃; initial temperature 51℃, single cycle temperature rise 1.24℃; initial temperature 52℃, single cycle temperature rise 1.30℃; initial temperature 53℃, single cycle temperature rise 1.36℃; initial temperature 54℃, single cycle temperature rise 1.41℃; initial temperature 55℃, single cycle temperature rise 1.47℃.

[0066] When the power limit ratio is 60%, the temperature rise per cycle is as follows: initial temperature 45℃, single-cycle temperature rise 1.10℃; initial temperature 46℃, single-cycle temperature rise 1.17℃; initial temperature 47℃, single-cycle temperature rise 1.23℃; initial temperature 48℃, single-cycle temperature rise 1.30℃; initial temperature 49℃, single-cycle temperature rise 1.36℃; initial temperature 50℃, single-cycle temperature rise 1.43℃; initial temperature 51℃, single-cycle temperature rise 1.49℃; initial temperature 52℃, single-cycle temperature rise 1.56℃; initial temperature 53℃, single-cycle temperature rise 1.63℃; initial temperature 54℃, single-cycle temperature rise 1.69℃; initial temperature 55℃, single-cycle temperature rise 1.76℃.

[0067] When the power limit ratio is 70%, the temperature rise per cycle is as follows: initial temperature 45℃, single cycle temperature rise 1.45℃; initial temperature 46℃, single cycle temperature rise 1.37℃; initial temperature 47℃, single cycle temperature rise 1.45℃; initial temperature 48℃, single cycle temperature rise 1.52℃; initial temperature 49℃, single cycle temperature rise 1.60℃; initial temperature 50℃, single cycle temperature rise 1.67℃; initial temperature 51℃, single cycle temperature rise 1.75℃; initial temperature 52℃, single cycle temperature rise 1.82℃; initial temperature 53℃, single cycle temperature rise 1.89℃; initial temperature 54℃, single cycle temperature rise 1.97℃; initial temperature 55℃, single cycle temperature rise 2.04℃.

[0068] When the power limit ratio is 80%, the temperature rise per cycle is as follows: initial temperature 45℃, single-cycle temperature rise 1.45℃; initial temperature 46℃, single-cycle temperature rise 1.37℃; initial temperature 47℃, single-cycle temperature rise 1.45℃; initial temperature 48℃, single-cycle temperature rise 1.52℃; initial temperature 49℃, single-cycle temperature rise 1.60℃; initial temperature 50℃, single-cycle temperature rise 1.67℃; initial temperature 51℃, single-cycle temperature rise 1.75℃; initial temperature 52℃, single-cycle temperature rise 2.08℃; initial temperature 53℃, single-cycle temperature rise 2.16℃; initial temperature 54℃, single-cycle temperature rise 2.25℃; initial temperature 55℃, single-cycle temperature rise 2.23℃.

[0069] When the power limit ratio is 90%, the temperature rise per cycle is as follows: initial temperature 45℃, single cycle temperature rise 1.70℃; initial temperature 46℃, single cycle temperature rise 1.79℃; initial temperature 47℃, single cycle temperature rise 1.88℃; initial temperature 48℃, single cycle temperature rise 1.97℃; initial temperature 49℃, single cycle temperature rise 2.07℃; initial temperature 50℃, single cycle temperature rise 2.16℃; initial temperature 51℃, single cycle temperature rise 2.25℃; initial temperature 52℃, single cycle temperature rise 2.34℃; initial temperature 53℃, single cycle temperature rise 2.43℃; initial temperature 54℃, single cycle temperature rise 2.52℃; initial temperature 55℃, single cycle temperature rise 2.61℃.

[0070] Taking an equal charge and discharge power limit of 30% as an example: the first cycle starts at 45℃, resulting in a single-cycle temperature rise of 0.5℃; the second cycle starts at 45.5℃, with a single-cycle temperature rise of 0.52℃ obtained through linear interpolation; the third cycle results in 46.02℃, and so on. The final pulse end temperatures corresponding to different cycle numbers are as follows:

[0071] When the power limit ratio is 30%, the pulse end temperature is 45.50℃ when the cycle coefficient is 1, 46.02℃ when the cycle coefficient is 2, 46.56℃ when the cycle coefficient is 3, 47.12℃ when the cycle coefficient is 4, and 47.71℃ when the cycle coefficient is 5.

[0072] When the power limit ratio is 40%, the pulse end temperature is 45.70℃ when the cycle coefficient is 1, 46.43℃ when the cycle coefficient is 2, 47.20℃ when the cycle coefficient is 3, 48.01℃ when the cycle coefficient is 4, and 48.86℃ when the cycle coefficient is 5.

[0073] When the power limit ratio is 50%, the cycle factor is 1 and the pulse end temperature is 45.90℃; the cycle factor is 2 and the pulse end temperature is 46.85℃; the cycle factor is 3 and the pulse end temperature is 47.86℃; the cycle factor is 4 and the pulse end temperature is 48.92℃; and the cycle factor is 5 and the pulse end temperature is 50.04℃.

[0074] When the power limit ratio is 60%, the cycle factor is 1 and the pulse end temperature is 46.10℃; when the cycle factor is 2, the pulse end temperature is 47.27℃; when the cycle factor is 3, the pulse end temperature is 49.20℃; when the cycle factor is 4, the pulse end temperature is 50.81℃; and when the cycle factor is 5, the pulse end temperature is 52.54℃.

[0075] When the power limit ratio is 70%, the cycle factor is 1 and the pulse end temperature is 46.30℃; when the cycle factor is 2, the pulse end temperature is 48.12℃; when the cycle factor is 3, the pulse end temperature is 49.88℃; when the cycle factor is 4, the pulse end temperature is 51.79℃; and when the cycle factor is 5, the pulse end temperature is 53.85℃.

[0076] When the power limit ratio is 80%, the pulse end temperature is 46.50℃ when the cycle coefficient is 1, 48.56℃ when the cycle coefficient is 2, 49.88℃ when the cycle coefficient is 3, 51.79℃ when the cycle coefficient is 4, and 53.85℃ when the cycle coefficient is 5.

[0077] When the power limit ratio is 90%, the cycle factor is 1 and the pulse end temperature is 46.70℃; the cycle factor is 2 and the pulse end temperature is 48.56℃; the cycle factor is 3 and the pulse end temperature is 50.58℃; the cycle factor is 4 and the pulse end temperature is 52.79℃; and the cycle factor is 5 and the pulse end temperature is 55.20℃.

[0078] As can be seen from the above, based on the upper limit threshold of safe operating temperature of 55℃, and according to the pulse end temperature calculation results, the maximum power limitation ratio corresponding to 45℃ and 50% SOC is 80%. The method for determining the maximum power limitation ratio under other temperature and SOC conditions is similar.

[0079] Step S203: Based on the vehicle's power performance target and target evaluation data, determine the maximum power limit ratio X3 that satisfies the vehicle's power performance and user experience.

[0080] Define the design goals for vehicle power performance, specifically including acceleration and deceleration time design goals; based on the vehicle's basic parameters, use simulation models to calculate acceleration and deceleration times under different initial temperatures, state of charge (SOC), and power limitation ratios; compare the calculation results with the design goals to determine the maximum power limitation ratio X2 that meets the vehicle's acceleration and deceleration time goals under different initial temperatures and SOC conditions; under the premise of not affecting vehicle power performance and driving safety, and ensuring that the power limitation ratio X≥X2, conduct subjective evaluation and calibration through whole-vehicle testing, evaluate the user experience under different initial temperatures and SOC conditions and different power limitation ratios, and then determine the maximum power limitation ratio X3 that does not affect the user experience under different initial temperatures and SOC conditions.

[0081] Step S204: Based on the power limitation ratios X1 and X3, determine the optimal power limitation ratio under different initial temperatures and SOC conditions, and use this ratio to limit the allowable power of the battery assembly under high temperature conditions to obtain the power limitation value.

[0082] By comparing X1 and X3 in step S203, the smaller of the two can be used to determine the optimal power limiting ratio X under different initial temperatures and SOC conditions. opt , that is, X opt =min(X1, X3) is based on the allowable power of the battery pack, and is compared with the optimal power limit ratio X determined above. opt Multiplying these values ​​yields the optimal power limit under different initial temperatures and SOC conditions, i.e., P. limit =P pack-可用 *X optThis power limit ensures both battery and vehicle safety, vehicle performance, and user experience. Specifically, when looking up the allowable power and power limit ratio, the lower of the highest and lowest individual cell temperatures within the battery pack should be used, i.e., P. pack-可用 =min(P pack-可用 -Tmax, P pack-可用 -T min ), X opt =min(X) opt -T max X opt -T min The optimal power limit needs to be multiplied by the allowable power table for charging and discharging, respectively, by the optimal power limit ratio, i.e.: P limit-dis =P pack-可用-dis *X opt P limit-cha =P pack-可用-cha *X opt .

[0083] This invention also provides a schematic diagram of a high-temperature power limiting protection system for power batteries. Figure 3 This is a schematic diagram of a high-temperature power limiting protection system for a power battery according to an embodiment of the present invention, as shown below. Figure 3 As shown, the system includes: a detection module 301, a processing module 302, a calculation module 303, and a judgment module 304.

[0084] Detection module 301 is used to detect the battery's SOC and the highest and lowest individual cell temperatures T within the battery pack. max and T min .

[0085] The processing module 302 is used to look up the allowable power and the optimal power limit ratio under the current conditions based on the detected SOC and battery cell temperature.

[0086] The calculation module 303 is used to calculate the power limit value under the current conditions based on the allowable power and the optimal power limit ratio obtained by the processing module from the table.

[0087] The judgment module 304 is used to compare the power limit value obtained by looking up a table and calculating with the vehicle's required power at the corresponding time, and take the smaller of the two as the battery's output power under the current conditions.

[0088] Among them, the application detection module measures the battery SOC and the highest and lowest individual cell temperatures T within the battery pack. max and T minAt that time, the detected variables are not limited to the values ​​under the current state, but can also be detected based on the values ​​calculated based on the predicted operating conditions. Based on the detection results, the high-temperature power of the battery can be limited and protected in advance.

[0089] In this embodiment, typical operating conditions are extracted from the historical operating condition data of the whole vehicle to establish a typical operating condition database for battery high-temperature power limitation. Based on the number of cycles of typical operating conditions and the upper limit threshold of the battery's safe operating temperature, the power limitation ratio X1 corresponding to the battery under different initial temperatures and SOC conditions is determined. Based on the vehicle's power performance target and target evaluation data, the maximum power limitation ratio X3 that satisfies the vehicle's power performance and user experience is determined. According to the power limitation ratios X1 and X3, the optimal power limitation ratio under different initial temperatures and SOC conditions is determined. The allowable power of the battery pack under high-temperature conditions is limited by this ratio. The power limitation value obtained in this way can simultaneously ensure the safety of battery and vehicle use, vehicle power performance and user experience. This solves the technical problem that the battery high-temperature power limitation protection method cannot cover operating conditions with fast vehicle speed response and cannot simultaneously take into account the safety of battery and vehicle use, vehicle power performance and user experience. It achieves the technical effect of the battery high-temperature power limitation protection method covering operating conditions with fast vehicle speed response and simultaneously taking into account the safety of battery and vehicle use, vehicle power performance and user experience.

[0090] Example 3

[0091] According to an embodiment of the present invention, an apparatus for determining a power limit value of a power battery is also provided. It should be noted that this apparatus for determining the power limit value of a power battery can be used to perform the method for determining the power limit value of a power battery in Embodiment 1.

[0092] Figure 4 This is a schematic diagram of a device for determining the power limit value of a power battery according to an embodiment of the present invention. Figure 4 As shown, the device 400 for determining the power limit value of the power battery may include: an acquisition unit 401, a first processing unit 402, a first determination unit 403, a second determination unit 404, and a third determination unit 405.

[0093] The acquisition unit 401 is used to acquire target operating condition data of the vehicle. The target operating condition data is used to characterize the operating condition data in which the temperature value of the power battery is higher than a preset temperature value and the average power response speed of the vehicle is higher than a preset average power response speed during the driving process. The target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value.

[0094] The first processing unit 402 is used to determine the first power limit ratio value of the power battery in the pulse temperature rise table based on the first temperature value and the target temperature value of the power battery.

[0095] The first determining unit 403 is used to determine the second power limit ratio value of the power battery based on the vehicle's power performance target data and target evaluation data.

[0096] The second determining unit 404 is used to determine the minimum value between the first power limit ratio value and the second power limit ratio value as the target power limit ratio value of the power battery.

[0097] The third determining unit 405 is used to determine the power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery.

[0098] Optionally, the acquisition unit 401 may further include: a first acquisition module for acquiring historical operating condition data of the vehicle; and a second acquisition module for acquiring target operating condition data in response to data in the historical operating condition data where the temperature value of the power battery is higher than a preset temperature value and the average power response speed is higher than a preset average power response speed.

[0099] Optionally, the device further includes: a fourth determining unit, configured to determine, based on the vehicle's allowable power value, multiple power limit values ​​corresponding to multiple power limit ratio values ​​when the target operating condition data are a first temperature value and a first remaining charge value; a fifth determining unit, configured to determine a second temperature value of the power battery corresponding to each power limit value based on each of the multiple power limit values, wherein the second temperature value is used to characterize the degree of temperature rise of the power battery when it is charged or discharged based on each power limit value; and a second processing unit, configured to plot the first temperature value, the first remaining charge value, the multiple power limit ratio values, and the second temperature value of the power battery corresponding to each power limit ratio value to obtain a pulse temperature rise table.

[0100] Optionally, the first determining unit may include: a processing module for a lookup step, wherein the lookup step involves searching a pulse temperature rise table based on a first temperature value to obtain a second temperature value corresponding to each power limit ratio value; a first determining module for a determining step, wherein the sum between the first temperature value and the second temperature value is determined as the first temperature value, and the process continues until the first temperature value is reached a preset number of times; and a second determining module for determining a first power limit ratio value based on multiple first temperature values ​​and a target temperature value.

[0101] Optionally, the second determining module may include: a determining submodule, configured to determine the third power limiting ratio as the first power limiting ratio when all the first temperature values ​​corresponding to the third power limiting ratio among the multiple power limiting ratio values ​​are less than the target temperature value, and when any one of the first temperature values ​​corresponding to the fourth power limiting ratio among the multiple power limiting ratio values ​​is greater than the target temperature value, wherein the third power limiting ratio is used to characterize that the first temperature value corresponding to any one of the multiple power limiting ratio values ​​is less than the largest power limiting ratio among the target temperature values.

[0102] Optionally, the third determining unit 405 may further include: a third determining module, used to determine the product between the target power limit ratio value and the allowable power value as the power limit value.

[0103] In this embodiment, by acquiring target operating condition data of the vehicle, wherein the target operating condition data is used to characterize the operating condition data where the temperature value of the power battery is higher than a preset temperature value and the average power response speed of the vehicle is higher than a preset average power response speed during driving, the target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value; based on the first temperature value and the target temperature value of the power battery, a first power limit ratio value of the power battery is determined in a pulse temperature rise table; based on the vehicle's power performance target data and target evaluation data, a second power limit ratio value of the power battery is determined. The power limiting ratio is determined by taking the minimum value between the first power limiting ratio and the second power limiting ratio as the target power limiting ratio for the power battery. Based on the target power limiting ratio and the allowable power value of the power battery, the power limiting value of the power battery is determined. This solves the technical problems that the high-temperature power limiting protection method for batteries cannot cover the operating conditions with fast vehicle speed response, and cannot simultaneously take into account the safety of battery and vehicle use, vehicle power performance, and user experience. It achieves the technical effect of the high-temperature power limiting protection method for batteries covering the operating conditions with fast vehicle speed response, while simultaneously taking into account the safety of battery and vehicle use, vehicle power performance, and user experience.

[0104] Example 4

[0105] According to an embodiment of the present invention, a computer-readable storage medium is also provided, the storage medium including a stored program, wherein the program executes the method for determining the power limit value of a power battery in Embodiment 1.

[0106] Example 5

[0107] According to an embodiment of the present invention, a processor is also provided for running a program, wherein the program executes the method for determining the power limit value of a power battery in Embodiment 1.

[0108] Example 6

[0109] According to an embodiment of the present invention, a vehicle is also provided for performing the method for determining the power limit value of a power battery in Embodiment 1.

[0110] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0111] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0112] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0113] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0114] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a first processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0115] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0116] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the power limit value of a power battery, characterized in that, include: Acquire target operating condition data of the vehicle, wherein the target operating condition data is used to characterize the operating condition data in which the temperature value of the power battery of the vehicle is higher than a preset temperature value and the average power response speed of the vehicle is higher than a preset average power response speed during the driving process, and the target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value. Based on the first temperature value and the target temperature value of the power battery, the first power limit ratio value of the power battery is determined in the pulse temperature rise table; Based on the vehicle's power performance target data and target evaluation data, a second power limit ratio value for the power battery is determined; The minimum value between the first power limit ratio and the second power limit ratio is determined as the target power limit ratio of the power battery; The power limit value of the power battery is determined based on the target power limit ratio and the allowable power value of the power battery.

2. The method according to claim 1, characterized in that, Obtain the target operating condition data of the vehicle, including: Obtain the historical operating data of the vehicle; In response to data in the historical operating condition data where the temperature value of the power battery is higher than the preset temperature value and the average power response speed is higher than the preset average power response speed, the target operating condition data is obtained.

3. The method according to claim 1, characterized in that, Before determining the first power limit ratio value of the power battery in the pulse temperature rise table based on the first temperature value and the target temperature value of the power battery, the method further includes: When the target operating condition data is the first temperature value and the first remaining power value, based on the vehicle's allowable power value, determine multiple power limit values ​​corresponding to the allowable power value under multiple power limit ratio values; Based on each of the plurality of power limit values, a second temperature value of the power battery corresponding to each power limit value is determined, wherein the second temperature value is used to characterize the degree of temperature rise of the power battery when the power battery is charged or discharged based on each power limit value; The pulse temperature rise table is obtained by plotting the first temperature value, the first remaining power value, the plurality of power limit ratio values, and the second temperature value of the power battery corresponding to each power limit ratio value.

4. The method according to claim 3, characterized in that, Based on the first temperature value and the target temperature value of the power battery, the first power limit ratio value of the power battery is determined in the pulse temperature rise table, including: The search step involves searching the pulse temperature rise table based on the first temperature value to obtain the second temperature value corresponding to each power limit ratio value. The determination process involves setting the sum of the first temperature value and the second temperature value as the first temperature value, and continuing this process until the first temperature value is reached a preset number of times. Based on multiple first temperature values ​​and the target temperature value, the first power limit ratio value is determined.

5. The method according to claim 3 or 4, characterized in that, Based on multiple first temperature values ​​and the target temperature value, the first power limiting ratio value is determined, including: When all the first temperature values ​​corresponding to the third power limit ratio value among the plurality of power limit ratio values ​​are less than the target temperature value, and any one of the first temperature values ​​corresponding to the fourth power limit ratio value among the plurality of power limit ratio values ​​is greater than the target temperature value, the third power limit ratio value is determined as the first power limit ratio value, wherein the third power limit ratio value is used to characterize that the first temperature value corresponding to any one of the plurality of power limit ratio values ​​is less than the largest power limit ratio value among the target temperature values.

6. The method according to claim 1, characterized in that, Based on the target power limit ratio and the allowable power value of the power battery, the power limit value of the power battery is determined, including: The power limit value is determined by the product of the target power limit ratio and the allowable power value.

7. A device for determining the power limit value of a power battery, characterized in that, include: An acquisition unit is used to acquire target operating condition data of a vehicle, wherein the target operating condition data is used to characterize the operating condition data in which the temperature value of the power battery of the vehicle is higher than a preset temperature value and the average power response speed of the vehicle is higher than a preset average power response speed during the driving process. The target operating condition data includes at least one of the following: a first temperature value of the power battery and a first remaining charge value of the power battery corresponding to the first temperature value. The first processing unit is used to determine the first power limit ratio value of the power battery in the pulse temperature rise table based on the first temperature value and the target temperature value of the power battery. The first determining unit is used to determine the second power limit ratio value of the power battery based on the vehicle's power performance target data and target evaluation data. The second determining unit is used to determine the minimum value between the first power limit ratio value and the second power limit ratio value as the target power limit ratio value of the power battery. The third determining unit is used to determine the power limit value of the power battery based on the target power limit ratio value and the allowable power value of the power battery.

8. A processor, characterized in that, The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when it runs.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 6.

10. A vehicle, characterized in that, The vehicle is used to perform the method according to any one of claims 1 to 6.

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