Temperature control method, device and vehicle

Abstract

The application provides a temperature control method and device and a vehicle, relates to the technical field of temperature control of an electrical storage device, and can be used for improving the convenience of controlling the internal temperature of an electrical core in the electrical storage device. The method comprises the following steps: acquiring a preset temperature rising rate of the electrical storage device under a current working condition; detecting an actual temperature rising rate of the surface temperature of the electrical storage device; if the actual temperature rising rate is greater than the preset temperature rising rate and the duration is greater than a preset duration, taking a cooling measure on the electrical storage device, wherein the preset duration corresponds to the preset temperature rising rate.

Description

Technical Field

[0001] This application relates to the field of temperature control technology for energy storage devices, and more particularly to temperature control methods, devices, and vehicles. Background Technology

[0002] Typically, in energy storage devices such as battery packs in new energy vehicles or battery arrays in charging station cabinets, the internal temperature of the battery cells rises during charging (e.g., battery pack charging) or discharging (e.g., battery array discharging). Since prolonged operation at excessively high temperatures can lead to cell lifespan degradation or even thermal runaway, it is necessary to control the internal temperature of the battery cells in energy storage devices. For example, cooling measures may be implemented when the internal temperature of the battery cells exceeds the upper limit of a defined temperature range.

[0003] Existing temperature control methods involve placing temperature sensors inside the battery cells of an energy storage device to detect the internal temperature of the cells during charging or discharging. However, this method requires placing the temperature sensors inside the cells, which involves modifying the cell structure and makes controlling the internal temperature of the cells in the energy storage device quite complex. Summary of the Invention

[0004] This application provides a temperature control method, device, and vehicle that can solve the technical problem of how to improve the convenience of controlling the internal temperature of the battery cells in an energy storage device.

[0005] In a first aspect, embodiments of this application provide a temperature control method, comprising: obtaining a preset heating rate of the energy storage device under the current operating conditions; detecting the actual heating rate of the surface temperature of the energy storage device; if the actual heating rate is greater than the preset heating rate and the duration is greater than the preset duration, then taking cooling measures on the energy storage device, wherein the preset duration corresponds to the preset heating rate.

[0006] The temperature control method provided in this application does not require placing a temperature sensor inside the energy storage device. Instead, it detects the surface temperature of the energy storage device, calculates the actual rate of temperature rise, and compares this rate with a preset rate of temperature rise under current operating conditions. This determines whether the temperature of the energy storage device is at risk of exceeding the upper limit of a defined temperature range, allowing for appropriate cooling measures. This method eliminates the need for structural damage or modification to the energy storage device, simplifies operation, and improves the ease of controlling the internal temperature of the battery cells.

[0007] In one possible implementation, obtaining the preset temperature rise rate of the energy storage device under the current operating conditions includes: obtaining the actual operating parameters of the energy storage device under the current operating conditions, wherein the operating parameters include at least one of charge / discharge rate, state of charge, and number of charge / discharge cycles; obtaining the mapping relationship between the preset operating parameters of the energy storage device under different operating conditions and the initial temperature rise rate of the surface of the energy storage device; and determining the preset temperature rise rate under the current operating conditions based on the actual operating parameters of the energy storage device under the current operating conditions and the mapping relationship.

[0008] By establishing a three-dimensional table representing the mapping relationship between the preset operating parameters of the energy storage device and the initial temperature rise rate of the device surface under different operating conditions, the preset temperature rise rate of the energy storage device under the current operating conditions can be determined based on the actual operating parameters of the energy storage device under the current operating conditions and the three-dimensional table. This method is convenient and fast, and can improve the speed of detecting the temperature of the energy storage device.

[0009] In one possible implementation, determining the preset heating rate under the current operating condition based on the actual operating parameters and mapping relationship of the energy storage device under the current operating condition includes: determining a first initial heating rate based on the actual operating parameters of the energy storage device under the current operating condition, wherein the first initial heating rate is the initial heating rate corresponding to the actual operating parameters of the energy storage device under the current operating condition; and correcting the first initial heating rate by an ambient temperature correction factor to obtain the preset heating rate under the current operating condition.

[0010] Since higher actual ambient temperatures facilitate heat transfer from the inside of the energy storage device to its surface, the initial heating rate needs to be adjusted when the actual ambient temperature is higher than the standard ambient temperature to obtain the preset heating rate under the current operating conditions. Conversely, lower actual ambient temperatures hinder heat transfer from the inside of the energy storage device to its surface, so the initial heating rate also needs to be adjusted when the actual ambient temperature is lower than the standard ambient temperature to obtain the preset heating rate under the current operating conditions.

[0011] By correcting the initial heating rate based on the ambient temperature correction factor, a preset heating rate under the current operating conditions can be obtained. This allows the preset heating rate to better match the operating conditions of the energy storage device, which helps to improve the accuracy and reliability of the temperature control method.

[0012] In one possible implementation, correcting the first initial heating rate using an ambient temperature correction factor includes: detecting the actual ambient temperature of the energy storage device under current operating conditions; multiplying the difference between the actual ambient temperature and the standard ambient temperature by 0.01 and then adding 1 to obtain an ambient temperature correction factor; and multiplying the ambient temperature correction factor by the first initial heating rate to obtain a preset heating rate under current operating conditions.

[0013] This is consistent with the previous analysis. When the actual ambient temperature is higher, it is more conducive to the transfer of heat from the inside of the energy storage device to the surface of the energy storage device. Therefore, when the actual ambient temperature is higher than the standard ambient temperature, the heat loss during the transfer of heat from the inside of the energy storage device to the surface of the energy storage device is relatively small. Therefore, the preset heating rate corresponding to the energy storage device under the current operating conditions should be greater than the preset heating rate under the standard ambient temperature.

[0014] The lower the actual ambient temperature, the more unfavorable it is for the transfer of heat from the inside of the energy storage device to its surface. Therefore, when the actual ambient temperature is lower than the standard ambient temperature, the heat loss during the transfer process from the inside of the energy storage device to its surface is relatively large. Thus, the preset heating rate corresponding to the energy storage device under the current operating conditions should be reduced compared to the preset heating rate under the standard ambient temperature.

[0015] This allows the preset heating rate to be better matched with the current operating conditions of the energy storage device, thereby improving the accuracy of the temperature control method.

[0016] In one possible implementation, detecting the actual temperature rise rate of the surface temperature of the energy storage device includes: detecting the temperature of each surface of the energy storage device and calculating the temperature rise rate of each surface of the energy storage device; and averaging the temperature rise rates of each surface of the energy storage device to obtain the actual temperature rise rate of the surface temperature of the energy storage device.

[0017] By detecting the temperature of each surface of the energy storage device and taking the average of the heating rates of each surface as the actual heating rate of the device's surface, the actual heating rate can more accurately represent the overall heating rate of the energy storage device's surface, thus improving the reliability and accuracy of the temperature control method.

[0018] In one possible implementation, averaging the heating rate of each surface temperature of the energy storage device includes: averaging the heating rates of all temperatures on each surface of the energy storage device to obtain a first average value; comparing the heating rates of all temperatures on each surface of the energy storage device with the first average value to select heating rates whose absolute value of the difference from the first average value is less than a preset difference as qualified heating rates; and averaging the multiple qualified heating rates again to obtain the actual heating rate of the surface temperature of the energy storage device.

[0019] First, the heating rate of all surfaces is compared with a first average value. Heating rates whose absolute difference from the first average value is less than a preset difference are selected as qualified heating rates. This process removes abnormal data with large deviations from other heating rates. Then, the average of multiple qualified heating rates is calculated again to obtain the actual heating rate of the energy storage device's surface. This makes the obtained actual heating rate more accurate and reliable, contributing to the improvement of the reliability and accuracy of the temperature control method.

[0020] In one possible implementation, cooling measures are taken for the energy storage device, including at least one of the following: increasing the cooling efficiency of the energy storage device by a first preset percentage; and reducing the charging current or discharging current of the energy storage device by a second preset percentage.

[0021] Taking the battery pack of a new energy vehicle as an example, the energy storage device is usually equipped with a thermal management module. The thermal management module can be used to cool the battery pack. Therefore, increasing the cooling efficiency of the energy storage device by a first preset percentage, that is, increasing the working power of the thermal management module in the energy storage device by a first preset percentage, can improve the cooling performance of the energy storage device, so as to reduce the temperature of the energy storage device as soon as possible and reduce the risk of the temperature of the energy storage device exceeding the upper limit of the limited temperature range.

[0022] Taking the battery pack of a new energy vehicle as an example, the charging current of the energy storage device is usually positively correlated with the charging rate; the larger the charging current, the higher the corresponding charging rate. Therefore, by reducing the charging current of the energy storage device by a second preset percentage, the charging rate can be reduced. This reduces the heat generated by the battery cells in the energy storage device, thereby reducing the risk of the device's temperature exceeding the upper limit of the specified temperature range. For an explanation of reducing the discharge current of the energy storage device by a second preset percentage, please refer to the above explanation of reducing the charging current of the energy storage device by a second preset percentage; it will not be repeated here.

[0023] In one possible implementation, the temperature control method further includes issuing a warning signal if the actual heating rate is greater than the preset heating rate.

[0024] Taking the battery pack of a new energy vehicle as an example, if the actual heating rate exceeds the preset heating rate, the vehicle will issue voice prompts and indicator lights to indicate that the battery storage device is at risk of overheating. Passengers in the vehicle or those nearby should move away from the vehicle to ensure personal safety. These voice prompts and indicator lights serve as warning signals. This improves the safety and reliability of the battery storage device.

[0025] In one possible implementation, the temperature control method further includes: controlling the temperature detection frequency of the energy storage device according to the charge / discharge rate of the energy storage device, wherein the temperature detection frequency of the energy storage device is positively correlated with the charge / discharge rate of the energy storage device.

[0026] The higher the charge / discharge rate of an energy storage device, the greater the heat generated by the battery cells during charging and discharging, and consequently, the faster the internal temperature of the cells rises. Therefore, a higher charge / discharge rate necessitates a higher frequency of temperature detection. This increases the speed at which the actual temperature rise rate of the device's surface is detected, allowing for a faster response to abnormal temperature increases and reducing the risk of the battery cells exceeding the upper limit of their defined temperature range.

[0027] Secondly, embodiments of this application provide a temperature control device, including: an acquisition module, a temperature detection module, and a processing module. The acquisition module is used to acquire a preset heating rate of the energy storage device under the current operating conditions. The temperature detection module is used to detect the actual heating rate of the surface temperature of the energy storage device. The processing module is used to take cooling measures on the energy storage device when the actual heating rate is greater than the preset heating rate.

[0028] Thirdly, embodiments of this application provide a control device, which includes: a memory and a processor; the memory and the processor are coupled; the memory is used to store instructions executable by the processor; when the processor executes the instructions, it executes any of the above-mentioned temperature control methods.

[0029] Fourthly, this application provides a vehicle including the aforementioned temperature control device or the aforementioned control device.

[0030] Fifthly, this application provides a computer-readable storage medium storing a computer program or instructions that, when executed on a device, cause the device to perform the method of the first aspect or any possible implementation thereof.

[0031] Sixthly, this application provides a computer program product, which includes a computer program or instructions that, when executed on a device, cause the device to perform the method in the first aspect or any possible implementation of the first aspect.

[0032] The second to sixth aspects described above correspond to the technical solutions of the first aspect of the embodiments of this application. The beneficial effects achieved by each aspect and its corresponding feasible implementation are similar, and will not be repeated here. It should be noted that various possible implementations of any aspect described above can be combined, provided that the solutions do not contradict each other. Attached Figure Description

[0033] Figure 1 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 1 ; Figure 2 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 2 ; Figure 3 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 3 ; Figure 4 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 4 ; Figure 5 This is a schematic diagram of the temperature control device provided in an embodiment of this application; Figure 6 This is a schematic diagram of a control device provided in an embodiment of this application.

[0034] Reference numerals: 100, temperature control device; 10, acquisition module; 20, temperature detection module; 30, processing module; 40, timing module; 50, voice module; 200, control device; 201, memory; 202, processor; 203, communication interface; 204, bus. Detailed Implementation

[0035] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Those skilled in the art will recognize that, with the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0036] Typically, for energy storage devices, such as battery packs in new energy vehicles, battery arrays in charging station energy storage cabinets, or batteries in electronic devices, the internal temperature of the battery cells rises during charging or discharging. Since prolonged operation at excessively high temperatures can lead to increased internal resistance, reduced usable capacity, and even thermal runaway, it is necessary to control the internal temperature of the battery cells during charging or discharging. For example, cooling measures can be implemented when the internal temperature exceeds the upper limit of a defined temperature range. Exemplary cooling measures include reducing the charging or discharging rate of the energy storage device and increasing the operating power of the thermal management equipment to improve its cooling capacity. This ensures that the internal temperature of the battery cells remains below or within the defined temperature range, without exceeding its upper limit, thus guaranteeing the safety and reliability of the energy storage device.

[0037] Temperature control methods for energy storage devices in related technologies involve installing temperature sensors inside the battery cells to detect the internal temperature of the cells during charging or discharging. However, placing the temperature sensor inside the cell requires damaging and modifying its structure, making this method complex and difficult to operate.

[0038] Based on this, embodiments of this application provide a temperature control method, device, and vehicle to improve the convenience of controlling the internal temperature of the battery cells in an energy storage device. The idea is as follows: first, based on the current operating condition of the energy storage device, a preset heating rate of the surface of the battery cells in the energy storage device corresponding to the current operating condition is determined; then, the actual heating rate of the surface temperature of the energy storage device (i.e., the temperature of the surface of the battery cells in the energy storage device) is detected; if the actual heating rate is greater than the preset heating rate, cooling measures are taken for the energy storage device.

[0039] The preset temperature rise rate can be obtained as follows: Taking the battery cells in a new energy vehicle's battery pack as an example, cells with different operating parameters are charged separately. Temperature sensors are installed inside and on the surface of the cells to detect whether the internal temperature of the cell exceeds the upper limit of a defined temperature range during the charging process. If it does not exceed the upper limit of the defined temperature range, the maximum value of the temperature rise rate on the cell surface during the charging process is taken as the preset temperature rise rate of the cell under the corresponding operating parameters. Operating parameters may include at least one of charge / discharge rate, state of charge, and number of charge / discharge cycles. Different operating conditions of the energy storage device correspond to different operating parameters.

[0040] The temperature control method provided in this application will be described below with reference to specific embodiments. These embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0041] Figure 1 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 1 . Reference Figure 1 The temperature control method provided in this application embodiment may include: S100: Obtain the preset heating rate of the energy storage device under the current operating conditions.

[0042] As mentioned above, the energy storage device can be a battery pack of a new energy vehicle, a battery pack in the energy storage cabinet of a charging station, or a battery of an electronic device, etc., and this application does not specifically limit it. When the actual temperature rise rate of the energy storage device under the current operating conditions is greater than the preset temperature rise rate, it indicates that the temperature of the energy storage device is at risk of exceeding the upper limit of the limited temperature range.

[0043] In some examples, the temperature range is defined as 55°C to 65°C.

[0044] In some embodiments, see Figure 2 , Figure 2 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 2 Obtaining the preset heating rate of the energy storage device under current operating conditions includes: S110. Obtain the actual operating parameters of the energy storage device under the current operating conditions, wherein the operating parameters include at least one of the following: charge / discharge rate, state of charge, and number of charge / discharge cycles.

[0045] Based on the characteristics of the battery cells in an energy storage device, parameters such as charge / discharge rate, state of charge (SOC), and number of charge / discharge cycles are closely related to the temperature rise rate of the cell surface. Specifically, taking charge / discharge rate as an example, the higher the charge / discharge rate, the greater the temperature rise rate that the cell surface can achieve during the charge / discharge process. Therefore, by using at least one of the operating parameters such as charge / discharge rate, SOC, and number of charge / discharge cycles as the basis for further determining the preset temperature rise rate of the energy storage device, the temperature detection of the energy storage device can be made more accurate and reliable.

[0046] S120. Obtain the mapping relationship between the preset operating parameters of the energy storage device and the initial heating rate of the surface of the energy storage device under different operating conditions.

[0047] For example, the charge / discharge rate can be used as the first dimension parameter, the state of charge as the second dimension parameter, and the number of charge / discharge cycles as the third dimension parameter. Testing is conducted on energy storage devices with different first, second, and third dimension parameters: temperature sensors are installed inside and on the surface of the energy storage device to detect whether the internal temperature of the device exceeds the upper limit of a defined temperature range during the process of charging to full or discharging to zero. If the temperature does not exceed the upper limit of the defined temperature range, the maximum value of the surface temperature rise rate during the charging or discharging process is taken as the initial temperature rise rate of the energy storage device under the corresponding operating parameters.

[0048] This results in a three-dimensional table. The coordinates of the three-dimensional table are the charge / discharge rate, the state of charge, and the number of charge / discharge cycles. The data in the three-dimensional table is the initial temperature rise rate of the surface of the energy storage device corresponding to the corresponding operating parameters. In this way, a mapping relationship between the preset operating parameters of the energy storage device and the initial temperature rise rate of the surface of the energy storage device is established under different operating conditions.

[0049] S130. Determine the preset heating rate under the current operating conditions based on the actual operating parameters and mapping relationship of the energy storage device under the current operating conditions.

[0050] For example, the actual operating parameters of the energy storage device under the current operating conditions include the charging rate, state of charge, and number of charge-discharge cycles. The initial heating rate of the surface of the energy storage device can be determined by these three parameters in the three-dimensional table mentioned above. This initial heating rate can be used as the preset heating rate of the energy storage device under the current operating conditions, or the preset heating rate can be obtained by further correction of the initial heating rate.

[0051] By establishing a three-dimensional table representing the mapping relationship between the preset operating parameters of the energy storage device and the initial temperature rise rate of the device surface under different operating conditions, the preset temperature rise rate of the energy storage device under the current operating conditions can be determined based on the actual operating parameters of the energy storage device under the current operating conditions and the three-dimensional table. This method is convenient and fast, and can improve the speed of detecting the temperature of the energy storage device.

[0052] In some embodiments, see Figure 3 , Figure 3 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 3 The preset heating rate under the current operating conditions is determined based on the actual operating parameters and mapping relationship of the energy storage device under the current operating conditions, including: S131. Determine the first initial heating rate based on the actual operating parameters of the energy storage device under the current operating conditions. The first initial heating rate is the initial heating rate corresponding to the actual operating parameters of the energy storage device under the current operating conditions.

[0053] S132. The first initial heating rate is corrected by the ambient temperature correction factor to obtain the preset heating rate under the current operating conditions.

[0054] For example, the initial heating rate of the energy storage device under preset operating parameters can be obtained by testing at a standard ambient temperature. The standard ambient temperature can be any temperature between 20℃ and 25℃, such as 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃. However, the actual ambient temperature of the energy storage device under current operating conditions may be higher or lower than the standard ambient temperature. Since a higher actual ambient temperature is more conducive to heat transfer from the inside of the energy storage device to its surface, the first initial heating rate needs to be corrected when the actual ambient temperature is higher than the standard ambient temperature to obtain the preset heating rate under current operating conditions. Conversely, a lower actual ambient temperature is less conducive to heat transfer from the inside of the energy storage device to its surface, so the first initial heating rate also needs to be corrected when the actual ambient temperature is lower than the standard ambient temperature to obtain the preset heating rate under current operating conditions.

[0055] By correcting the initial heating rate based on the ambient temperature correction factor, a preset heating rate under the current operating conditions can be obtained. This allows the preset heating rate to better match the operating conditions of the energy storage device, which helps to improve the accuracy and reliability of the temperature control method.

[0056] In some embodiments, see Figure 4 , Figure 4 A flowchart illustrating one embodiment of the temperature control method provided in this application. Figure 4 The correction of the first initial heating rate using an ambient temperature correction factor includes: S1321. Detect the actual ambient temperature of the energy storage device under the current operating conditions.

[0057] For example, a temperature sensor can be used to detect the actual ambient temperature of the energy storage device under the current operating conditions.

[0058] S1322. Multiply the difference between the actual ambient temperature and the standard ambient temperature by 0.01, and then add 1 to obtain the ambient temperature correction factor.

[0059] S1323. Multiply the ambient temperature correction factor by the first initial heating rate to obtain the preset heating rate under the current operating conditions.

[0060] For example, taking an actual ambient temperature of 30℃ and a standard ambient temperature of 25℃ as an example, the value of the ambient temperature correction factor is 1+(30-25)×0.01, which is a coefficient greater than 1. Multiplying it by the first initial heating rate can yield a larger heating rate, which can be used as the preset heating rate under the current operating conditions.

[0061] For example, taking an actual ambient temperature of 20℃ and a standard ambient temperature of 25℃ as an example, the value of the ambient temperature correction factor is 1+(20-25)×0.01, which is a coefficient less than 1. Multiplying it by the first initial heating rate can yield a smaller heating rate, which can be used as the preset heating rate under the current operating conditions.

[0062] This is consistent with the previous analysis. When the actual ambient temperature is higher, it is more conducive to the transfer of heat from the inside of the energy storage device to the surface of the energy storage device. Therefore, when the actual ambient temperature is higher than the standard ambient temperature, the heat loss during the transfer of heat from the inside of the energy storage device to the surface of the energy storage device is relatively small. Therefore, the preset heating rate corresponding to the energy storage device under the current operating conditions should be greater than the preset heating rate under the standard ambient temperature.

[0063] The lower the actual ambient temperature, the more unfavorable it is for the transfer of heat from the inside of the energy storage device to its surface. Therefore, when the actual ambient temperature is lower than the standard ambient temperature, the heat loss during the transfer process from the inside of the energy storage device to its surface is relatively large. Thus, the preset heating rate corresponding to the energy storage device under the current operating conditions should be reduced compared to the preset heating rate under the standard ambient temperature.

[0064] This allows the preset heating rate to be better matched with the current operating conditions of the energy storage device, thereby improving the accuracy of the temperature control method.

[0065] S200, detects the actual heating rate of the surface temperature of the energy storage device.

[0066] In some embodiments, detecting the actual rate of temperature rise of the surface temperature of the energy storage device includes: The temperature of each surface of the energy storage device is detected, and the heating rate of each surface is calculated.

[0067] For example, the energy storage device can be a square structure, and temperature sensors can be installed on each surface (e.g., six surfaces) of the device to detect the temperature of each surface. For instance, multiple thermistors or platinum resistance thermometers can be used to detect the temperature of each surface. Taking thermistors as an example, they can be fixed to the surface of the energy storage device (e.g., the surface of the battery cells in a battery pack) using high thermal conductivity silicone. For example, the temperature measurement range of the thermistors can be -40℃ to 125℃, and the measurement accuracy can be ±0.1℃; the measurement accuracy of the platinum resistance thermometers can be ±0.05℃.

[0068] The frequency at which the temperature sensor collects the temperature of each surface of the energy storage device can be 10Hz to 200Hz, such as 10Hz, 20Hz, 50Hz, 100Hz, 150Hz or 200Hz.

[0069] Taking a temperature sensor fixedly connected to the first surface of the energy storage device as an example, let the temperature measured at the first moment be denoted as F1, and the temperature measured at the second moment be denoted as F2. Then, the heating rate of the first surface of the energy storage device is (F2-F1) / (T2-T1), where T1 represents the time corresponding to the first moment, and T2 represents the time corresponding to the second moment. For example, the first moment and the second moment can be the temperature acquisition moments in two adjacent temperature acquisition cycles when the temperature sensor collects the temperature of each surface of the energy storage device. Taking a frequency of 100Hz for temperature acquisition of each surface of the energy storage device as an example, the temperature acquisition cycle is 0.01s, and the difference between the second moment and the first moment is 0.01s.

[0070] The average heating rate of each surface of the energy storage device is calculated to obtain the actual heating rate of the surface of the energy storage device.

[0071] By detecting the temperature of each surface of the energy storage device and taking the average of the heating rates of each surface as the actual heating rate of the device's surface, the actual heating rate can more accurately represent the overall heating rate of the energy storage device's surface, thus improving the reliability and accuracy of the temperature control method.

[0072] In some embodiments, averaging the heating rates of the various surfaces of the energy storage device includes: The average heating rate of all surfaces of the energy storage device is calculated to obtain the first average value.

[0073] The heating rate of each surface of the energy storage device is compared with the first average value to select the heating rate whose absolute value of the difference with the first average value is less than a preset difference as the qualified heating rate.

[0074] For example, the preset difference can be 20% to 30% of the first average value, such as 20%, 25% or 30%, etc., and this application does not make a specific limitation in this regard.

[0075] The average of multiple qualified heating rates is calculated again to obtain the actual heating rate of the surface temperature of the energy storage device.

[0076] First, the heating rate of all surfaces is compared with a first average value. Heating rates whose absolute difference from the first average value is less than a preset difference are selected as qualified heating rates. This process removes abnormal data with large deviations from other heating rates. Then, the average of multiple qualified heating rates is calculated again to obtain the actual heating rate of the energy storage device's surface. This makes the obtained actual heating rate more accurate and reliable, contributing to the improvement of the reliability and accuracy of the temperature control method.

[0077] In other embodiments, the first average value can be used as the actual heating rate of the surface temperature of the energy storage device, which can improve the speed of obtaining the actual heating rate and thus improve the temperature measurement speed of the temperature control method.

[0078] In other embodiments, the maximum temperature rise rate of each surface of the energy storage device can be taken as the actual temperature rise rate of the energy storage device. This makes the temperature control method more conservative in detecting the internal temperature of the battery cells in the energy storage device, thereby improving the safety of the temperature control method.

[0079] Determine whether the actual heating rate is greater than the preset heating rate. S300: If the actual heating rate is greater than the preset heating rate and the duration is greater than the preset duration, then take cooling measures for the energy storage device. The preset duration corresponds to the preset heating rate.

[0080] By setting the temperature control method to only apply cooling measures to the energy storage device when the actual heating rate exceeds a preset heating rate and the duration of this exceedance exceeds a preset duration, the system can reduce misjudgments caused by brief temperature anomalies in the energy storage device or temporary malfunctions of the temperature sensor, thereby improving the fault tolerance and reliability of the temperature control method. For example, the preset duration can be 0.3s to 1.5s, such as 0.3s, 0.5s, 1.0s, or 1.5s.

[0081] Furthermore, the preset duration corresponds to the preset heating rate. That is, the preset duration of the energy storage device varies under different operating conditions.

[0082] For example, the preset temperature rise rate is related to the charge / discharge rate of the energy storage device under the current operating conditions, and the preset duration corresponds to the preset temperature rise rate, which is equivalent to setting the preset duration to correspond to the charge / discharge rate. Taking the charge rate as an example, the higher the charge rate, the shorter the corresponding preset duration; the lower the charge rate, the longer the corresponding preset duration. This setting is because the higher the charge rate of the energy storage device, the greater the energy transfer during charging, and the greater the heat generated by the battery cells in the energy storage device. At this time, the response to abnormal temperature rise rate should be more rapid to reduce the risk that the internal temperature of the battery cells in the energy storage device exceeds the upper limit of the limited temperature range.

[0083] If the actual heating rate is less than or equal to the preset heating rate, the actual heating rate of the energy storage device's surface temperature continues to be monitored. For example, even after cooling measures are taken for the energy storage device, the actual heating rate of the energy storage device's surface temperature also continues to be monitored.

[0084] The temperature control method provided in this application does not require placing a temperature sensor inside the energy storage device. Instead, it detects the surface temperature of the energy storage device, calculates the actual rate of temperature rise, and compares this rate with a preset rate of temperature rise under current operating conditions. This determines whether the temperature of the energy storage device is at risk of exceeding the upper limit of a defined temperature range, allowing for appropriate cooling measures. This method eliminates the need for structural damage or modification to the energy storage device, simplifies operation, and improves the ease of controlling the internal temperature of the battery cells.

[0085] In some embodiments, cooling measures are taken for the energy storage device, including at least one of the following: Increase the cooling efficiency of the energy storage device by a first preset percentage; reduce the charging current or discharging current of the energy storage device by a second preset percentage.

[0086] For example, taking the battery pack of a new energy vehicle as an example, the energy storage device is usually equipped with a thermal management module. The thermal management module can be used to cool the battery pack. Therefore, increasing the cooling efficiency of the energy storage device by a first preset percentage, that is, increasing the working power of the thermal management module in the energy storage device by a first preset percentage, can improve the cooling performance of the energy storage device, so as to reduce the temperature of the energy storage device as soon as possible and reduce the risk that the temperature of the energy storage device exceeds the upper limit of the limited temperature range.

[0087] In some examples, the first preset percentage can be 30% to 50%, such as 30%, 40%, or 50%.

[0088] For example, taking the battery pack of a new energy vehicle as an example, the charging current of the energy storage device is usually positively correlated with the charging rate; the larger the charging current, the higher the corresponding charging rate. Therefore, by reducing the charging current of the energy storage device by a second preset percentage, the charging rate can be reduced, which can reduce the heat generated by the cells in the energy storage device and thus reduce the risk of the energy storage device's temperature exceeding the upper limit of the defined temperature range. For an explanation of reducing the discharge current of the energy storage device by a second preset percentage, please refer to the above explanation of reducing the charging current of the energy storage device by a second preset percentage, which will not be repeated here.

[0089] In some examples, the second preset percentage can be 10% to 30%, such as 10%, 20%, or 30%.

[0090] In some embodiments, the temperature control method further includes: If the actual heating rate exceeds the preset heating rate, an early warning signal will be issued.

[0091] For example, taking the battery pack of a new energy vehicle as an example, if the actual heating rate exceeds the preset heating rate, the vehicle will issue a voice prompt and indicator light warning, indicating that the temperature of the energy storage device is at risk of overheating. Passengers in the vehicle or those nearby should move away from the vehicle to ensure personal safety. These voice prompts or indicator light warnings serve as early warning signals. This improves the safety and reliability of the energy storage device.

[0092] In some embodiments, the temperature control method further includes: The temperature detection frequency of the energy storage device is controlled according to the charge and discharge rate of the energy storage device. The temperature detection frequency of the energy storage device is positively correlated with the charge and discharge rate of the energy storage device. This means that the higher the charge and discharge rate of the energy storage device, the higher the corresponding temperature detection frequency of the energy storage device.

[0093] For example, the higher the charge / discharge rate of the energy storage device, the greater the heat generated by the battery cells during the charging and discharging process, and consequently, the faster the internal temperature of the battery cells rises. Therefore, the higher the charge / discharge rate of the energy storage device, the higher the frequency of temperature detection needs to be. This increases the speed at which the actual temperature rise rate of the device's surface can be detected, allowing for a faster response to abnormal temperature rise rates and reducing the risk of the internal temperature of the battery cells exceeding the upper limit of the defined temperature range.

[0094] In some examples, when the charge / discharge rate of the energy storage device is below 1C, the temperature detection frequency of the energy storage device can be 25Hz~35Hz, such as 25Hz, 30Hz, or 35Hz. When the charge / discharge rate of the energy storage device is between 1C and 5C, the temperature detection frequency of the energy storage device can be 90Hz~110Hz, such as 90Hz, 100Hz, or 110Hz. When the charge / discharge rate of the energy storage device is above 5C, the temperature detection frequency of the energy storage device can be 190Hz~210Hz, such as 190Hz, 200Hz, or 210Hz.

[0095] The temperature control method of this application has been described above. The apparatus for performing the above method provided in this application is described below. Those skilled in the art will understand that the method and apparatus can be combined with and referenced by each other. The related apparatus provided in this application can perform the steps in the above temperature control method. The related apparatus can be referred to the following description: Figure 5 This is a schematic diagram of a temperature control device 100 provided in an embodiment of this application. The temperature control device 100 may include: an acquisition module 10, a temperature detection module 20, and a processing module 30. The acquisition module 10 is used to acquire a preset heating rate of the energy storage device under the current operating conditions; the temperature detection module 20 is used to detect the actual heating rate of the surface temperature of the energy storage device; and the processing module 30 is used to take cooling measures on the energy storage device when the actual heating rate is greater than the preset heating rate.

[0096] In this way, the temperature detection device 100 can take cooling measures for the energy storage device when the actual heating rate of the surface temperature exceeds the preset heating rate under the current operating conditions. This reduces the risk of the energy storage device's temperature exceeding the upper limit of the defined temperature range, without the need to place a temperature sensor inside the energy storage device. This eliminates the need to damage or modify the structure of the energy storage device, simplifies operation, and allows for relatively convenient control of the internal temperature of the battery cells.

[0097] In some examples, the temperature control device 100 also includes a timing module 40, which can be used to start timing when the actual heating rate detected by the temperature detection module 20 is greater than the preset heating rate. When the timing duration (i.e. the duration) is greater than the preset duration, the processing module 30 takes cooling measures for the energy storage device.

[0098] In some examples, the temperature control device 100 also includes a voice module 50, which can be used to issue a voice prompt when the actual heating rate is greater than the preset heating rate, so as to form the aforementioned warning signal.

[0099] In some examples, the acquisition module 10 may perform the following steps: acquire the actual operating parameters of the energy storage device under the current operating conditions; acquire the mapping relationship between the preset operating parameters of the energy storage device under different operating conditions and the initial heating rate of the surface of the energy storage device; and determine the preset heating rate under the current operating conditions based on the actual operating parameters of the energy storage device under the current operating conditions and the mapping relationship.

[0100] In some examples, the acquisition module 10 may perform the following steps: determine a first initial heating rate based on the actual operating parameters of the energy storage device under the current operating conditions, wherein the first initial heating rate is the initial heating rate corresponding to the actual operating parameters of the energy storage device under the current operating conditions; and correct the first initial heating rate by means of an ambient temperature correction factor to obtain a preset heating rate under the current operating conditions.

[0101] In some examples, the acquisition module 10 may perform the following steps: detect the actual ambient temperature of the energy storage device under the current operating conditions; multiply the difference between the actual ambient temperature and the standard ambient temperature by 0.01 and then add 1 to obtain an ambient temperature correction factor; multiply the ambient temperature correction factor by a first initial heating rate to obtain a preset heating rate under the current operating conditions.

[0102] In some examples, the temperature detection module 20 may perform the following steps: detect the temperature of each surface of the energy storage device and calculate the heating rate of each surface of the energy storage device; and average the heating rates of each surface of the energy storage device to obtain the actual heating rate of the surface temperature of the energy storage device.

[0103] In some examples, the temperature detection module 20 may perform the following steps: averaging the heating rates of all temperatures on each surface of the energy storage device to obtain a first average value; comparing the heating rates of all temperatures on each surface of the energy storage device with the first average value to select heating rates whose absolute value of the difference from the first average value is less than a preset difference as qualified heating rates; and averaging the multiple qualified heating rates again to obtain the actual heating rate of the surface temperature of the energy storage device.

[0104] In some examples, the modules described above can be physical structures, circuits, or programs. For instance, temperature detection module 20 may include a temperature sensor, and voice module 50 may include a speaker.

[0105] This application also provides a control device. For example... Figure 6 As shown, Figure 6 This is a schematic diagram of a control device 200 provided in an embodiment of this application. The control device 200 includes a processor 202 and a bus 204. Optionally, the control device may also include a memory 201; optionally, the control device 200 may also include a communication interface 203.

[0106] Processor 202 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this application. Processor 202 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this application. Processor 202 may also be a combination that implements computing functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0107] Communication interface 203 is used to connect with other devices via a communication network. This communication network can be Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0108] The memory 201 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0109] In one possible implementation, the memory 201 can exist independently of the processor 202. The memory 201 can be connected to the processor 202 via a bus 204 and is used to store instructions or program code. When the processor 202 calls and executes the instructions or program code stored in the memory 201, it can implement the temperature control method provided in this embodiment. In another possible implementation, the memory 201 can also be integrated with the processor 202.

[0110] Bus 204 can be an extended industry standard architecture (EISA) bus, etc. Bus 204 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0111] This application also provides a vehicle, which includes any of the aforementioned temperature control devices. The vehicle provided in this application can be a passenger vehicle or a freight vehicle, and can also be a pure electric vehicle or a hybrid vehicle, wherein both pure electric vehicles and hybrid vehicles belong to the aforementioned new energy vehicles. This application does not limit the specific purpose of the vehicle, and the choice can be made according to actual needs.

[0112] This application also provides a computer-readable storage medium, which includes a computer program or instructions that, when executed on a device, cause the device to perform any of the above-described temperature control methods.

[0113] This application also provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run on the device, the device performs any of the above-described temperature control methods.

[0114] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0115] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only 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 coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0117] 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 network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0118] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0119] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion 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 described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0120] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0121] The terms "first," "second," etc., used in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the description of embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0122] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A temperature control method, characterized in that, The temperature control method for controlling the temperature of an energy storage device includes: Obtain the preset heating rate of the energy storage device under the current operating conditions; The actual rate of temperature rise on the surface of the energy storage device was detected. If the actual heating rate is greater than the preset heating rate and the duration is greater than the preset duration, then cooling measures are taken for the energy storage device, wherein the preset duration corresponds to the preset heating rate.

2. The temperature control method according to claim 1, characterized in that, The step of obtaining the preset heating rate of the energy storage device under the current operating conditions includes: Obtain the actual operating parameters of the energy storage device under the current operating conditions, wherein the operating parameters include at least one of charge / discharge rate, state of charge, and number of charge / discharge cycles; Obtain the mapping relationship between the preset operating parameters of the energy storage device and the initial heating rate of the surface of the energy storage device under different operating conditions; The preset heating rate under the current operating condition is determined based on the actual operating parameters of the energy storage device under the current operating condition and the mapping relationship.

3. The temperature control method according to claim 2, characterized in that, Determining the preset heating rate under the current operating condition based on the actual operating parameters of the energy storage device under the current operating condition and the mapping relationship includes: The first initial heating rate is determined based on the actual operating parameters of the energy storage device under the current operating conditions. The first initial heating rate is the initial heating rate corresponding to the actual operating parameters of the energy storage device under the current operating conditions. The first initial heating rate is corrected by an ambient temperature correction factor to obtain the preset heating rate under the current operating conditions.

4. The temperature control method according to claim 3, characterized in that, The correction of the first initial heating rate using an ambient temperature correction factor includes: The actual ambient temperature at which the energy storage device is located under the current operating conditions is detected; Multiply the difference between the actual ambient temperature and the standard ambient temperature by 0.01, and then add 1 to obtain the ambient temperature correction factor. Multiply the ambient temperature correction factor by the first initial heating rate to obtain the preset heating rate under the current operating conditions.

5. The temperature control method according to any one of claims 1-4, characterized in that, The actual temperature rise rate of the surface temperature of the energy storage device includes: The temperature of each surface of the energy storage device is detected, and the heating rate of each surface of the energy storage device is calculated. The average heating rate of each surface of the energy storage device is calculated to obtain the actual heating rate of the surface of the energy storage device.

6. The temperature control method according to claim 5, characterized in that, The averaging of the heating rates of each surface of the energy storage device includes: The average heating rate of all surfaces of the energy storage device is calculated to obtain a first average value; The heating rate of each surface of the energy storage device is compared with the first average value to select the heating rate whose absolute value of the difference with the first average value is less than a preset difference as the qualified heating rate. The average of the multiple qualified heating rates is calculated again to obtain the actual heating rate of the surface temperature of the energy storage device.

7. The temperature control method according to claim 1, characterized in that, Also includes: The temperature detection frequency of the energy storage device is controlled according to the charge / discharge rate of the energy storage device, wherein the temperature detection frequency of the energy storage device is positively correlated with the charge / discharge rate of the energy storage device.

8. A temperature control device, characterized in that, The temperature control device is used to control the temperature of the energy storage device, and the temperature control device includes: The acquisition module is used to acquire the preset heating rate of the energy storage device under the current operating conditions; Temperature detection module, used to detect the actual heating rate of the surface temperature of the energy storage device; The processing module is used to take cooling measures for the energy storage device when the actual heating rate is greater than the preset heating rate.

9. A control device, characterized in that, The control device includes: a memory and a processor; the memory and the processor are coupled; the memory is used to store instructions executable by the processor; when the processor executes the instructions, it performs the temperature control method as described in any one of claims 1-7.

10. A vehicle, characterized in that, It includes the temperature control device as described in claim 8, or the control device as described in claim 9.

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