Control method of ptc heater, battery device, vehicle, and storage medium

Abstract

The application discloses a control method of a PTC heater, a battery device, a vehicle and a storage medium. The control method comprises the following steps: when the remaining power of the battery is lower than a first preset power and the current temperature of the battery is lower than a first preset temperature, the heater is controlled to switch gears to enter a preheating mode to heat the battery; when the battery enters a charging compensation mode, the heater is controlled to switch gears to cooperate with the battery to perform charging compensation; when the remaining power of the battery is greater than or equal to a second preset power, the heater is controlled to switch gears to enter a maximum power mode to heat the battery, and the second preset power is greater than the first preset power. The heater can heat the battery when the battery is in a preset ambient temperature such as a low temperature, the performance of the battery and / or the heater is improved, the working mode of the heater is dynamically determined, the working mode of the heater is dynamically switched, and the heater heats the battery and / or cooperates with the battery to perform charging compensation in the target working mode.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application 2025106489448, filed on May 19, 2025, entitled “Control method for heater, battery device, vehicle and storage medium”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of heater technology, and in particular to control methods for PTC heaters, battery devices, vehicles, and storage media. Background Technology

[0004] Devices such as battery electric vehicles and hybrid electric vehicles are equipped with batteries and require charging when the device is in a low-temperature environment. However, during battery charging, if the ambient temperature of the battery is lower than the preset ambient temperature, the initial charging rate of the battery may be lower due to the low temperature, and the requested current and charging power from the charging station or other power supply equipment may be lower, which cannot meet the actual needs of the PTC heater.

[0005] For example, if the battery's charging power requirement is 3KW, then the PTC heater can only use 3KW. However, in actual applications, due to factors such as changes in water temperature and battery power, the PTC heater's actual power requirement is 10KW. In this case, the PTC heater's available power cannot meet its power requirements, causing the battery power to decrease and eventually become unusable, thus reducing the user experience. Summary of the Invention

[0006] This application provides a control method for a PTC heater, a battery device, a vehicle, and a storage medium. The PTC heater can heat the battery when it is at a preset ambient temperature, such as a low temperature, to improve the performance of the battery and / or the PTC heater at the preset ambient temperature. For example, it can improve the charging speed of the battery in low-temperature environments, prevent overcharging and over-discharging of the battery, and improve the charging compensation speed of the PTC heater. In addition, the operating mode of the PTC heater can be determined based on conditions or parameter information, and the operating mode of the PTC heater can be dynamically switched according to conditions. This allows the PTC heater to heat the battery and / or cooperate with the battery to perform charging compensation in the target operating mode, thereby improving the performance of low-temperature fast charging.

[0007] To address the aforementioned technical problems, this application provides a control method for a PTC heater. The PTC heater is used to heat the battery when it is being charged at a preset ambient temperature. The control method includes: in response to the battery's remaining charge being lower than a first preset charge and the battery's current temperature being lower than a first preset temperature, controlling the PTC heater to switch gears to enter a preheating mode to heat the battery; when the battery is detected to have entered a charging compensation mode, controlling the PTC heater to switch gears to cooperate with the battery in charging compensation; in response to the battery's remaining charge being greater than or equal to a second preset charge, controlling the PTC heater to switch gears to enter a maximum power mode to heat the battery; wherein the second preset charge is greater than the first preset charge.

[0008] In some embodiments, the method further includes: when the PTC heater is in preheating mode, detecting the current temperature of the battery and the charging window power of the battery in real time; and controlling the PTC heater to switch gears to cooperate with the battery for charging compensation in response to the current temperature being greater than or equal to a first preset temperature and / or the charging window power meeting preset conditions.

[0009] In some embodiments, the method further includes: controlling the battery to turn off charging compensation in response to the current temperature being greater than a second preset temperature; wherein the second preset temperature is greater than a first preset temperature.

[0010] In some embodiments, the method further includes: in response to the remaining battery power being greater than a first preset power and less than a second preset power, controlling the PTC heater to switch gears to cooperate with the battery for charging compensation.

[0011] In some embodiments, the method further includes: in response to the battery's discharge current being greater than a first preset current, determining that the remaining battery charge is greater than or equal to a second preset charge.

[0012] In some embodiments, controlling the PTC heater to switch gears to enter a preheating mode to heat the battery includes: disconnecting the charging of the battery when controlling the PTC heater to switch gears to enter the preheating mode; obtaining a power level table of the PTC heater; and controlling the PTC heater to heat the battery using the power corresponding to the highest level in the power level table; wherein the power corresponding to the highest level is the maximum power value corresponding to each level in the power level table.

[0013] In some embodiments, when the battery is detected to have entered the charging compensation mode, the PTC heater is controlled to switch power levels to cooperate with the battery in charging compensation. This includes: maintaining the charging of the battery while the PTC heater is controlled to switch power levels to enter the charging compensation mode; obtaining the power level table of the PTC heater; and controlling the PTC heater to switch power levels according to the power level table based on the compensation algorithm to cooperate with the battery in charging compensation.

[0014] In some embodiments, the PTC heater is controlled to switch power levels according to a power level table based on a compensation algorithm to cooperate with the battery for charging compensation. This includes: obtaining the battery's maximum allowable charging power, charging request power, and charging reserve power; wherein the maximum allowable charging power corresponds one-to-one with the battery's remaining capacity, the charging request power is less than the charging pile's output power, and the charging reserve power is less than the charging request power; obtaining the reference power of the PTC heater for heating the battery, where the reference power is less than the maximum allowable charging power; calculating the target power of the PTC heater when heating the battery based on the charging request power, charging reserve power, and reference power; and controlling the PTC heater to switch to the level corresponding to the target power according to the power level table to cooperate with the battery for charging compensation.

[0015] In some embodiments, the target power for the PTC heater to heat the battery is calculated based on the requested charging power, the reserved charging power, and the reference power, including: subtracting the reserved charging power from the requested charging power to obtain a power difference; and taking the maximum value between the power difference and the reference power as the target power for the PTC heater to heat the battery.

[0016] In some embodiments, during the battery charging compensation process, the compensation current during battery charging compensation increases or decreases by a preset size and / or a multiple of the preset size.

[0017] In some embodiments, controlling the PTC heater to switch gears to enter the maximum power mode to heat the battery includes: while controlling the PTC heater to switch gears to enter the maximum power mode, maintaining charging of the battery and discharging the battery; calculating the available power of the PTC heater based on the battery's charging window conversion charging power, the battery's allowable discharge power, and the battery's low-voltage load reserved power; and controlling the PTC heater to heat the PTC heater based on the available power.

[0018] In some embodiments, the available power of the PTC heater is calculated based on the battery's charging window conversion charging power, the battery's allowable discharge power, and the battery's low-voltage load reserved power, including: adding the battery's charging window conversion charging power to the battery's allowable discharge power to obtain a sum; and subtracting the battery's low-voltage load reserved power from the sum to obtain the available power of the PTC heater.

[0019] In some embodiments, the method further includes: increasing the requested current of the battery in response to the battery's charging window current being less than a second preset current.

[0020] In some embodiments, the permissible discharge loss energy of the battery is obtained by calculating the permissible discharge loss energy of the battery during the entire period from the start-up of the PTC heater to the completion of compensation based on the rated energy of the battery pack, SOC, SOE, SOH and driving range algorithm.

[0021] In some embodiments, the SOC decrease of the battery is less than or equal to 0.01.

[0022] In some embodiments, controlling the PTC heater to switch to the maximum power mode to heat the battery includes: after controlling the PTC heater to switch to the maximum power mode, obtaining the power level table of the PTC heater; in response to the PTC heater not being at the highest level of the power level table, determining the target power of the PTC heater when heating the battery according to the current curve of the PTC heater at each level of the power level table, and controlling the PTC heater to heat the battery based on the target power; in response to the PTC heater being at the highest level of the power level table, performing charging compensation on the battery, and during the charging compensation process, increasing the requested current of the battery by a preset size and / or a multiple of the preset size until the requested current reaches the charging window current.

[0023] In some embodiments, the method further includes: obtaining the remaining battery charge lost when the PTC heater is in each power level of the power level table; determining that the PTC heater enters the highest level of the power level table in response to the remaining charge loss being greater than or equal to a target value; and determining that the PTC heater does not enter the highest level of the power level table in response to the remaining charge loss being less than the target value.

[0024] In some embodiments, each setting of the PTC heater corresponds to a specific number of IGBTs turned on. When the compensation current is greater than or equal to the minimum current of the corresponding setting during battery charging compensation, the PTC heater enters the corresponding setting.

[0025] In some embodiments, the method further includes: acquiring the output power of the charging pile; determining whether the battery is in fast charging mode based on the output power; and determining that the battery is charging at a preset ambient temperature in response to the battery being in fast charging mode.

[0026] To address the aforementioned technical problems, this application also provides a battery device, which includes a memory and a processor, as well as a PTC heater and a battery. The memory stores a computer program, and the processor executes the aforementioned control method based on the computer program.

[0027] In order to solve the above-mentioned technical problems, this application provides another aspect of a vehicle, which includes the above-mentioned battery device.

[0028] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, is used to implement the aforementioned control method.

[0029] This application provides a PTC heater control method, battery device, vehicle, and storage medium in some embodiments. The PTC heater is used to heat the battery when it is being charged at a preset ambient temperature. The PTC heater control method includes: in response to the battery's remaining charge being lower than a first preset charge and the battery's current temperature being lower than a first preset temperature, controlling the PTC heater to switch gears to enter a preheating mode to heat the battery; when the battery is detected to be entering a charging compensation mode, controlling the PTC heater to switch gears to cooperate with the battery in charging compensation; in response to the battery's remaining charge being greater than or equal to a second preset charge, controlling the PTC heater to switch gears to enter a maximum power mode to heat the battery; wherein the second preset charge is greater than the first preset charge. The PTC heater provided in this application can heat the battery when it is at a preset ambient temperature, such as a low temperature, to improve the performance of the battery and / or the PTC heater at the preset ambient temperature, for example, to improve the charging speed of the battery in a low-temperature environment, prevent the battery from overcharging and over-discharging, and improve the charging compensation speed of the PTC heater. In addition, the mode of the PTC heater can be determined based on conditions or parameter information, and the PTC heater mode can be dynamically switched according to conditions, so that the PTC heater can heat the battery and / or cooperate with the battery to perform charging compensation in the target mode, thereby improving the performance of low temperature fast charging. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0031] Figure 1 This is a flowchart illustrating the control method of the PTC heater in some embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the process of using a compensation algorithm in conjunction with a battery to perform charging compensation in some embodiments of this application;

[0033] Figure 3 This is a flowchart illustrating how the charging request power of the battery is obtained in some embodiments of this application;

[0034] Figure 4This is a diagram showing the relationship between current and compensation current during gear switching in some embodiments of this application;

[0035] Figure 5 This is a flowchart illustrating the control method of the PTC heater in some embodiments of this application;

[0036] Figure 6 This is a flowchart illustrating the control method of the PTC heater in some embodiments of this application.

[0037] Figure 7 This is a flowchart illustrating the control method of the PTC heater in some embodiments of this application.

[0038] Figure 8 These are schematic diagrams of the battery device in some embodiments of this application;

[0039] Figure 9 These are schematic diagrams of the vehicle structure in some embodiments of this application;

[0040] Figure 10 This is a schematic diagram of the structure of a computer-readable storage medium in some embodiments of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] During battery charging, if the ambient temperature is lower than or equal to the preset ambient temperature, the initial charging rate may be lower due to the low temperature. Furthermore, the battery's request for current and charging power from the charging station or other power supply equipment may be insufficient to meet the actual needs of the PTC (Positive Temperature Coefficient) heater. For example, if the battery's charging power requirement is 3 kW, the PTC heater can only use 3 kW. However, in actual applications, due to factors such as changes in water temperature and battery power, the actual power requirement of the PTC heater may be 10 kW. In this case, the available power of the PTC heater cannot meet its power demands.

[0043] To address the aforementioned deficiencies, this application provides a control method for a PTC heater, a battery device, a vehicle, and a storage medium, which can improve problems such as insufficient power of the PTC heater during battery charging, increase the heating power of the PTC heater on the battery, and improve the charging speed of the battery in low-temperature environments.

[0044] According to some embodiments of this application, such as Figure 1 As shown, Figure 1 This is a flowchart illustrating the control method of the PTC heater in some embodiments of this application. When the battery is being charged at a preset ambient temperature, the PTC heater is used to heat the battery.

[0045] In some embodiments, when charging a battery using a power supply device such as a charging pile, the output power of the power supply device such as the charging pile can be obtained, and then the battery can be determined to enter fast charging mode based on the output power. When the battery enters fast charging mode, it is determined that the battery is charging at a preset ambient temperature.

[0046] Taking a charging station as an example, the system can obtain the charging station's output power and compare it with a preset power. If the output power is greater than the preset power, the battery is confirmed to be in fast charging mode; if the output power is less than or equal to the preset power, the battery is confirmed not to be in fast charging mode. The preset power can be determined based on actual conditions, such as 10KW, 15KW, or 20KW.

[0047] The preset ambient temperature for charging the battery can be a low-temperature environment, such as -10℃, -15℃, or -20℃. At low temperatures, the battery capacity and remaining state of charge (SOC) decrease, and the charging speed is limited, increasing charging time. Furthermore, when the device containing the battery is exposed to the same low-temperature environment, the device's performance will also be affected. For example, if the battery is used in a vehicle, the vehicle's driving range will decrease at low temperatures, causing the vehicle to fail to meet the user's driving needs.

[0048] Based on this, a control method for a PTC heater is provided to reduce the aforementioned defects, specifically as follows: Figure 1 As shown, the control method for the PTC heater includes:

[0049] Step 11: In response to the battery's remaining charge being lower than the first preset charge and the battery's current temperature being lower than the first preset temperature, control the PTC heater to switch gears and enter the preheating mode to heat the battery.

[0050] The current temperature of the battery is affected by the preset ambient temperature. However, because the PTC heater heats the battery, the current temperature of the battery is often higher than the preset ambient temperature.

[0051] In some embodiments, when the PTC heater is in preheating mode, the current temperature of the battery and the charging window power of the battery can be detected in real time; in response to the current temperature being greater than or equal to a first preset temperature and / or the charging window power meeting preset conditions, the PTC heater is controlled to switch gears to cooperate with the battery for charging compensation.

[0052] The battery charging window refers to a function or interface within the Battery Management System (BMS) used to monitor and control the battery's charging status. It helps users and the management system understand the battery's charging progress by displaying information such as the battery's charging status, charging progress, and battery temperature.

[0053] Specifically, when the charging window power supports the battery's compensation algorithm, the PTC heater can be controlled to switch power levels to assist the battery in entering the charging compensation mode, thus enabling the battery to perform charging compensation. For details regarding the compensation algorithm, please refer to the following text.

[0054] In some embodiments, in response to the current temperature being greater than a second preset temperature, the battery is controlled to turn off charging compensation; wherein the second preset temperature is greater than the first preset temperature, and the values ​​of the first preset temperature and the second preset temperature can be determined according to the actual situation, for example, the first preset temperature is -15℃ and the second preset temperature is -10℃, which is not limited here.

[0055] In some embodiments, when controlling the PTC heater to switch to preheating mode, the preheating mode is a pure heating mode that only heats the battery. To avoid over-discharge of the battery, charging needs to be disconnected. In this case, a power level table for the PTC heater can be obtained, and the power corresponding to the highest level in the table can be used to control the PTC heater to heat the battery. The power corresponding to the highest level is the maximum power value corresponding to each level in the power level table.

[0056] Specifically, when the PTC heater enters the preheating mode, the charging interface between the charging pile and other power supply equipment and the battery is disconnected to stop charging the battery. At this time, the PTC heater can provide sufficient power according to the actual power demand of the PTC heater. That is, the PTC heater can directly enter the highest power level in the power level table and release the limitation of the battery's requested current.

[0057] In some embodiments, each setting of the PTC heater corresponds to a specific number of IGBTs (Insulated-Gate Bipolar Transistors) that are turned on. During battery charging compensation, the PTC heater only enters the corresponding setting when the corresponding compensation current is greater than or equal to the minimum current of the corresponding setting. Determining whether the PTC heater switches settings by matching the compensation current with the minimum current of the setting avoids situations where the PTC heater gets stuck or fails to switch settings.

[0058] In one application scenario, taking a preset ambient temperature of -20℃ as an example, the PTC heater includes four IGBTs: IGBT1, IGBT2, IGBT3, and IGBT4. The heating element ratio of the four IGBTs is IGBT1:IGBT2:IGBT3:IGBT4 = 2:4:6:6. The more heating elements, the higher the power of the PTC heater. The power level table for this PTC heater is shown below:

[0059]

[0060] As shown in the table above, the highest power setting is setting 9, which corresponds to a power of 10800W. The lowest power setting is setting 0, which corresponds to a power of 0W. The power settings are arranged from 0 to 9, with the power gradually increasing from 0 to 9. It can be understood that the higher the power setting of the PTC heater, the greater the power of the PTC heater, and the more heat the PTC heater provides to the battery.

[0061] Furthermore, since power and current are positively correlated, as the power of the PTC heater increases, the compensation current also increases. Therefore, in addition to determining the PTC heater's setting based on its power, the setting can also be determined based on the compensation current.

[0062] When the power of the PTC heater is greater than or equal to 0W and less than 1200W, or when the compensation current for battery charging compensation is greater than or equal to the current corresponding to 0W and less than the current corresponding to 1200W, the PTC heater enters position 0. The power range of the PTC heater is [0, 1200)W.

[0063] When the power of the PTC heater is greater than or equal to 1200W and less than 2400W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 1200W and less than the current corresponding to 2400W, the PTC heater enters position 1.

[0064] When the power of the PTC heater is greater than or equal to 2400W and less than 3600W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 2400W and less than the current corresponding to 3600W, the PTC heater enters position 2.

[0065] When the power of the PTC heater is greater than or equal to 3600W and less than 4800W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 3600W and less than the current corresponding to 4800W, the PTC heater enters position 3.

[0066] When the power of the PTC heater is greater than or equal to 4800W and less than 6000W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 4800W and less than the current corresponding to 6000W, the PTC heater enters position 4.

[0067] When the power of the PTC heater is greater than or equal to 6000W and less than 7200W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 6000W and less than the current corresponding to 7200W, the PTC heater enters position 5.

[0068] When the power of the PTC heater is greater than or equal to 7200W and less than 8400W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 7200W and less than the current corresponding to 8400W, the PTC heater enters position 6.

[0069] When the power of the PTC heater is greater than or equal to 8400W and less than 9600W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 8400W and less than the current corresponding to 9600W, the PTC heater enters position 7.

[0070] When the power of the PTC heater is greater than or equal to 9600W and less than 10000W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 9600W and less than the current corresponding to 10000W, the PTC heater enters position 8.

[0071] When the power of the PTC heater is greater than or equal to 10000W, or when the compensation current for battery charging is greater than or equal to the current corresponding to 10000W, the PTC heater enters position 9.

[0072] Step 12: When the battery is detected to have entered the charging compensation mode, control the PTC heater to switch gears to cooperate with the battery for charging compensation.

[0073] In some embodiments, in response to the remaining battery power being greater than a first preset power level and less than a second preset power level, the PTC heater is controlled to switch gears to cooperate with the battery for charging compensation.

[0074] In some embodiments, while controlling the PTC heater to switch power levels to enter the charging compensation mode, the battery is continuously charged. In this case, a power level table of the PTC heater can be obtained, and the PTC heater can be controlled to switch power levels according to the power level table based on a compensation algorithm to cooperate with battery charging compensation.

[0075] like Figure 2 As shown, the process of entering charging compensation mode and using a compensation algorithm to compensate for battery charging includes:

[0076] Step 21: Obtain the battery's maximum allowable charging power, charging request power, and charging reserve power.

[0077] Among them, the maximum allowable charging power corresponds one-to-one with the remaining battery power, the charging request power is less than the output power of the charging pile, and the charging reserved power is less than the charging request power.

[0078] When the battery is at a preset ambient temperature, such as low temperature, the maximum allowable charging power corresponding to the remaining battery capacity can be represented by P. C The charging request power of the battery is represented by P1. At the initial moment (e.g., when the PTC heater starts heating the battery or the charging station or other power supply equipment starts charging the battery), P1 = P C As charging compensation proceeds, in order to prevent fluctuations in the compensation current, the battery has a charging reserve power, which is represented by P2. P2 is required to be less than P1, and the larger P2 is, the more stable the compensation current.

[0079] Where (P1-P2) is the real-time allocatable power of the PTC heater after charging compensation. C -P2) determines the compensation rate during the battery's charging compensation process.

[0080] It is worth noting that if (P) C If -P2) is greater than 0 and less than the power corresponding to the battery's compensation current, the battery cannot perform charging compensation; if (P C If -P2) is less than 0, the battery will be overcharged.

[0081] Specifically, during battery charging compensation, the compensation current is typically based on a minimum current of 2A (amperes). Taking a battery with a charging reserve power of 0.5kW and a maximum allowable charging power of 1kW as an example, when the battery is in a low-temperature environment, according to the compensation algorithm, the PTC heater will be charged at a compensation rate of 0.5kW (=1kW-0.5kW). However, the actual compensation current corresponding to 0.5kW power will not meet the minimum current requirement of 2A, and the battery will not be able to initiate charging compensation.

[0082] If the battery's reserved charging power is greater than the maximum allowable charging power, taking a reserved charging power of 2KW and a maximum allowable charging power of 1KW as an example, when the battery is in a low-temperature environment, according to the compensation algorithm, the battery will be overcharged, leading to lithium plating and other issues, which will affect the battery's lifespan.

[0083] In one application scenario, the reserved charging power is greater than 0.5KW, preferably 2KW.

[0084] In some embodiments, when charging a battery using power supply equipment such as a charging pile, in order to enable the charging operation and ensure the normal progress of the battery charging process, the output power of the power supply equipment such as the charging pile is required to be greater than the charging power requested by the battery.

[0085] Step 22: Obtain the reference power of the PTC heater for heating the battery.

[0086] The reference power is less than the maximum allowable charging power.

[0087] Specifically, the reference power of the PTC heater during operation or heating can be represented by P3. To prevent over-discharge of the battery due to low remaining charge (e.g., below the first preset charge level), P3 must be less than P. C .

[0088] In one application scenario, the preferred reference power is 3KW.

[0089] Step 23: Calculate the target power when the PTC heater heats the battery based on the charging request power, the charging reserved power, and the reference power.

[0090] In some embodiments, the power difference is obtained by subtracting the charging reserve power from the charging request power; the maximum value between the power difference and the reference power is used as the target power when the PTC heater heats the battery.

[0091] Specifically, the target power can be calculated using the following formula: P = max(P1 - P2, P3), where P is the target power and P1 - P2 is the power difference.

[0092] With P C Taking 1KW as an example, if (P1-P2) is less than P3, then the power of the PTC heater will be allocated based on the power of P3 being less than 1KW. At this time, the charging compensation speed will be slowed down. If (P1-P2) is greater than P3, then the battery may discharge during the charging compensation process.

[0093] Step 24: According to the power level table, control the PTC heater to switch to the level corresponding to the target power to cooperate with the battery for charging compensation.

[0094] Step 13: In response to the battery's remaining charge being greater than or equal to the second preset charge, control the PTC heater to switch to the maximum power mode to heat the battery; wherein the second preset charge is greater than the first preset charge.

[0095] In some embodiments, in response to the battery's discharge current exceeding a first preset current, it is determined that the remaining battery capacity is greater than or equal to a second preset capacity. The battery's discharge current is related to the discharge capacity that the battery pack can withstand. The value of the first preset current can be determined based on actual conditions and is not limited here.

[0096] In some embodiments, while controlling the PTC heater to switch to maximum power mode, the battery is continuously charged and discharged. At this time, the battery's charging request power can be calculated based on the battery's charging window conversion power, the battery's allowable discharge power, and the battery's low-voltage load reserved power; the PTC heater is then controlled to heat the PTC heater based on the charging request power.

[0097] Specifically, such as Figure 3 As shown, when entering maximum power mode, the battery's charging power request can be obtained in the following ways:

[0098] Step 31: Convert the battery's charging window power into the battery's allowable discharge power and obtain the sum value.

[0099] In some embodiments, the allowable discharge loss energy of the battery is obtained by calculating the allowable discharge loss energy of the battery during the entire process from the start-up of the PTC heater to the completion of compensation based on the rated energy of the battery pack, SOC (State of charge), SOE (State of Energy), SOH (State of Health), and range algorithm.

[0100] Specifically, based on the battery's remaining charge (SOC) and battery state of health (SOH), an SOE table is set up that associates SOC and SOH. The product of SOE and rated energy is converted into the remaining actual energy, with the actual energy unit being kWh. The actual remaining energy, combined with the range algorithm, can determine the remaining driving range, with the driving range unit being kilometers.

[0101] When the battery is installed in the vehicle equipment, the SOE meter can be used to calculate the remaining driving range of the vehicle equipment. In order to avoid a significant decrease in the remaining driving range, the allowable discharge energy loss of the battery during the PTC heater start-up phase can be calculated based on the SOE meter, rated energy, and driving range algorithm. That is, in order to avoid a significant decrease in the remaining driving range and / or a significant decrease in the remaining battery charge, the value is not specific. The synchronous conversion requires that the SOC decrease of the battery discharge is less than or equal to 1%, and the value is not specific.

[0102] In some embodiments, the allowable discharge capacity of the battery, i.e., the state of charge (SOC) decrease, can be calculated using the following formula: δ 补损 =Q 补偿放电 / Q 额， It can be directly converted through energy.

[0103] Where, δ 补损 The default value is the change in electricity consumption calculated through energy conversion, i.e., the decrease in State of Charge (SOC), Q. 额 Q is the rated energy of the battery pack, expressed in kWh. 补偿放电 This refers to the battery's discharge energy during the charging compensation process, expressed in kWh, which is also the allowable discharge energy.

[0104] In some embodiments, Q 补偿放电 It can be calculated using the following formula:

[0105] Q_replacement = (P*30 + P*(P / U)*2.5) / (3600*1000);

[0106] Q_supplement = 0.5 * P * ((P / U) * 2.5) / (3600 * 1000);

[0107] Q-compensated discharge = Q-replenished discharge - Q-replenishment;

[0108] The default compensation rate during the compensation process is 2A / 5s, the supplementary detection time is 30s, U is the total battery pack voltage in V; Q 补放 The energy lost by the PTC heater before charging compensation is completed, expressed in kWh (Q). 补充To compensate for the energy charged from the charging station during the process, the unit is kWh. P is the peak power of the PTC heater at each level, the unit is W. P can be determined according to the power level table of the PTC heater (such as 1200W, 2400W, 3600W, 4800W in the table above). U is the total battery voltage.

[0109] Step 32: Subtract the low-voltage load reserve power of the battery from the summation value to obtain the available power of the PTC heater.

[0110] When the battery is at a preset ambient temperature, such as low temperature, the battery's charging window conversion charging power refers to the charging power converted from the battery's charging window current, which can be represented by P4. The battery's allowable discharge power can be represented by P5. The battery's low-voltage load reserve power refers to the low-voltage load reserve power of devices such as DC-DC converters, which can be represented by P6.

[0111] Based on this, the available power of the PTC heater is: P1 = P4 + P5 - P6.

[0112] In some embodiments, in response to the battery's charging window current being less than a second preset current, the battery's requested current is increased, thereby increasing the battery's charging requested current and thus increasing the battery's charging requested power.

[0113] Specifically, when the PTC heater is in maximum power mode, the battery discharges while the charging interface of the battery and power supply equipment such as the charging pile remains connected, and the battery continues to charge. At this time, the available power of the PTC heater is released, and the battery can discharge instantaneously. If it is subsequently determined that the power is insufficient based on the battery's charging window power or the current is insufficient based on the battery's charging window current, charging compensation can be performed to increase the battery's charging request current.

[0114] In some embodiments, the charging power of the PTC heater is determined based on the battery's remaining energy, remaining charge, current battery temperature, and charging rate at the PTC heater's preheating temperature, to avoid a significant decrease in the battery's remaining charge during charging.

[0115] Since the battery discharges when the PTC heater is in maximum power mode, the available power of the PTC heater can be determined based on the battery's remaining energy, remaining charge, current battery temperature, and the charging rate at the PTC heater's preheating temperature. This helps prevent a significant drop in the battery's remaining charge during discharge.

[0116] It is worth noting that the decrease in remaining charge (SOC) can be less than or equal to 1% by controlling the release process of the available power of the PTC heater, with no specific value. The release process of the available power of the PTC heater is similar to a linear relationship. For example, the charging power of the PTC heater starts from 3KW at the beginning of the release, increases to 5KW at time T1, increases to 6KW at time T2 (>T1), and is fully released at time T3 (>T2). T1, T2, and T3 can be calculated based on the remaining charge, remaining energy, current battery temperature, and charging rate at the preheating temperature of the PTC heater.

[0117] It is understandable that keeping the rate of decrease of the remaining power to less than or equal to 0.01 can prevent the battery from losing too much power at once.

[0118] In some embodiments, the available power of the PTC heater during the charging compensation process is determined based on the battery's current temperature, remaining charge, remaining energy, state of health (SOH), rated energy, capacity, charging rate, expected compensation time, current compensation rate, and the power level table of the PTC heater. Then, the PTC heater's level is adjusted based on the available power of the PTC heater so that the PTC heater switches levels from the initial level according to the level plan until the highest level is reached.

[0119] During the switching of the PTC heater, the battery performs charging compensation. During the charging compensation process, the decrease in remaining charge (SOC) is less than or equal to 1%.

[0120] In some embodiments, the maximum discharge power of the battery is limited based on the discharge power of the battery during the charging compensation process, and the planning is dynamically adjusted so that the maximum allowable discharge power of the battery can be gradually released according to the battery's adaptable discharge power, thereby controlling the available power of the PTC heater, so that the power of the PTC heater increases from the lowest level to the highest level, while ensuring that the remaining charge (SOC) decrease is less than or equal to 1%, or less, and the value is not specific.

[0121] In some embodiments, the peak power of the PTC heater (e.g., 1200W, 2400W, 3600W, 4800W in the table above) is determined based on the battery's rated energy and current temperature. The peak power of the PTC heater is higher when the battery's rated energy is higher, and lower when the battery's rated energy is lower. For example, when the battery's rated energy is 50kWh, the peak power of the PTC heater is revised to be determined based on the battery's estimated heat exchange power requirement (see below for details), such as 10kW for batteries with a rated energy of 70kWh or higher. Similarly, when the battery's rated energy is 30kWh, the peak power is determined by estimating the heating power requirement based on the battery pack's capacity; for example, a peak power of 5kW is sufficient for a 30kWh battery pack.

[0122] Based on this, the peak power of the PTC heater can be dynamically adjusted. That is, the PTC heater can heat the battery according to the preferred peak power of each level in the PTC heater power level table (for example, the preferred peak power corresponding to level 1 in the table above is 1200W), and record the current curve of the PTC heater in real time during the level switching process. The real-time recording of the current curve stops after the PTC heater switches to the highest level.

[0123] The compensation current for battery charging compensation is based on the recorded current curve, and the requested current is compensated after a 5-second delay. The relationship between the current and the compensation current during gear switching is shown in the graph below. Figure 4 As shown, the horizontal axis of the graph represents time (T), with the unit being seconds (S), and the vertical axis represents current (C), with the unit being amperes (A). Figure 4 The dashed line marked "Stop" indicates the timeline when recording and storage cease. The solid line in the graph represents the compensation current curve, and the dashed line above the solid line represents the current curve of the PTC heater during mode switching. It's worth noting that the compensation current is approximately 1A (amperes) lower than the PTC heater's current curve (including 1A), ensuring that the battery's remaining charge (SOC) decreases by less than or equal to 0.01%.

[0124] In some embodiments, during battery charging compensation, the compensation current increases or decreases by a preset value and / or a multiple of the preset value. The preset value can be determined based on actual conditions, for example, 2A / 5S, and is not limited here.

[0125] In some embodiments, after controlling the PTC heater to switch to the maximum power mode, the power level table of the PTC heater can be obtained.

[0126] In response to the PTC heater not being at the highest power level in the power rating table, the target power for the PTC heater to heat the battery is determined based on the current curves of the PTC heater across different power levels in the table, and the PTC heater is controlled to heat the battery based on the target power. The current curves of the PTC heater across different power levels in the power rating table represent the current curves of the PTC heater during power level switching. For example, power level 1 corresponds to current 1, power level 2 corresponds to current 2, ..., power level 9 corresponds to current 9; these nine current values ​​determine the current curve.

[0127] In response to the PTC heater being at the highest setting on the power meter, the battery performs charging compensation. During the charging compensation process, the requested current of the battery is increased by a preset amount and / or a multiple of the preset amount until the requested current reaches the charging window current.

[0128] In some embodiments, the remaining battery charge lost when the PTC heater is at each power level in the power level table can be obtained, and the relationship between the remaining charge and a target value can be determined. The target value can be determined based on actual conditions, for example, 0.01, and is not limited here.

[0129] In response to the remaining power loss being greater than or equal to the target value, the PTC heater is set to the highest power level in the power level meter.

[0130] In response to the fact that the remaining power loss is less than the target value, it is determined that the PTC heater has not entered the highest setting of the power setting table.

[0131] Unlike existing technologies, the PTC heater control method provided in some embodiments of this application involves a PTC heater with three modes: a preheating mode, a charging compensation mode, and a maximum power mode. The PTC heater can heat the battery when it is at a preset ambient temperature, such as a low temperature, to improve the performance of the battery and / or the PTC heater at that temperature. For example, it can improve the charging speed of the battery in low-temperature environments, prevent overcharging and over-discharging, and improve the charging compensation speed of the PTC heater. Furthermore, the mode of the PTC heater can be determined based on conditions or parameter information, enabling dynamic switching of the PTC heater's operating mode. This allows the PTC heater to heat the battery and / or perform charging compensation in conjunction with the battery in the target mode.

[0132] In an application scenario, such as Figure 5 As shown, Figure 5 This is a flowchart illustrating a control method for a PTC heater in some embodiments of this application. The control method includes the following steps:

[0133] Step 401: Confirm that the battery is in fast charging mode.

[0134] Step 402: Determine whether the battery's SOC is greater than or equal to 0.1.

[0135] If not, proceed to step 403; otherwise, proceed to step 406.

[0136] Step 403: Determine that the PTC heater has entered the low SOC heating mode.

[0137] The low SOC heating mode corresponds to the charging compensation mode mentioned above.

[0138] Step 404: The PTC heater executes an upscaling strategy based on the requested current, and the battery is not allowed to discharge during the process.

[0139] The PTC heater adjusts its power level according to the power rating table of the PTC heater based on the battery's requested current.

[0140] Step 405: The maximum allowable charging power of the battery at low temperatures is P. C The charging power requested is P1, and initially P1 = P C During the compensation process, the reserved power for battery charging is P2 (< P1), and the power allocated to the PTC heater is max(P1-P2, P3). When setting parameters, ensure that P1>P3. The target current = requested current + battery charging window demand current - actual charging current. For any insufficient current, the requested current is increased according to 2A / 5S.

[0141] Among them, the target current corresponds to the compensation current when the battery is charging, the requested current corresponds to the requested current of the battery, and the battery charging window demand current corresponds to the charging window current.

[0142] Step 406: Determine that the PTC heater has entered the high SOC heating mode.

[0143] The high SOC heating mode corresponds to the maximum power mode mentioned above.

[0144] Before performing step 406, it is necessary to complete the acquisition and processing of state variables, including battery temperature, remaining battery charge, battery health status, remaining battery energy, rated energy, battery capacity, battery charging rate, battery compensation speed, estimated current compensation time, and PTC heater power level table.

[0145] Step 407: The PTC heater enters peak heating mode.

[0146] Step 408: Based on the collected status variables, select the optimal peak power level for the PTC heater and plan the PTC heater power levels.

[0147] Step 409: Record and store the current curve of the PTC heater during the gear switching process in real time.

[0148] Step 410: Determine whether the PTC heater has reached its peak power.

[0149] If yes, proceed to step 411; otherwise, proceed to step 412.

[0150] Step 411: The power of the PTC heater has stabilized. The requested current of the battery increases by 2A / 5S until the battery charging current reaches the target current of the battery charging window, and the battery charging compensation ends.

[0151] Step 412: The requested current of the battery is planned based on the recorded current curve. The planned current can be delayed by 5 seconds. The planning objectives include that the rate of change of the remaining battery charge is less than or equal to 0.01, and that the requested current of the battery does not exceed the actual demand current of the PTC heater.

[0152] In an application scenario, such as Figure 6 As shown, Figure 6 This application includes flowcharts illustrating the control method for a PTC heater in some embodiments. The control method includes the following steps:

[0153] Step 501: Status quantity acquisition and processing.

[0154] The state parameters include battery temperature, remaining battery charge, remaining battery energy, rated total energy, battery capacity, battery charging rate, estimated current compensation time, and water temperature.

[0155] Step 502: Based on the state variables, perform mode determination to determine whether the battery has entered fast charging mode.

[0156] If so, proceed to step 503.

[0157] Step 503: Confirm that the battery is in fast charging mode.

[0158] Step 504: Determine whether the battery's SOC is greater than or equal to 0.1.

[0159] If not, proceed to step 505; otherwise, proceed to step 508.

[0160] Step 505: Determine that the PTC heater has entered the low SOC heating mode.

[0161] Step 506: The PTC heater executes an upscaling strategy based on the requested current, and the battery is not allowed to discharge during the process.

[0162] The PTC heater adjusts its power level according to the power rating table of the PTC heater based on the battery's requested current.

[0163] Step 507: The PTC heater's speed controller controls the PTC heater to switch speeds.

[0164] Step 508: Determine that the PTC heater has entered the high SOC heating mode.

[0165] Step 509: Based on the collected state variables and the power level table of the PTC heater, determine the expected remaining energy loss during the compensation process under different PTC heater start-up power.

[0166] That is, to determine the remaining power lost by the battery during charging compensation when the PTC heater heats the battery at different settings using the corresponding preferred peak heating power.

[0167] Step 510: Determine whether the decrease in SOC is less than 0.01.

[0168] If not, proceed to step 511; otherwise, proceed to step 514.

[0169] Step 511: Confirm that the PTC heater has entered the high SOC heating mode and the battery is not charging.

[0170] After step 511, proceed to steps 512 and 513.

[0171] Step 512: Real-time process feedback and monitoring.

[0172] Step 509 is executed after step 512.

[0173] Step 513: The PTC heater enters peak maximum power mode.

[0174] Among them, the peak maximum power mode corresponds to the highest level in the power level table.

[0175] Step 507 is executed after step 513.

[0176] Step 514: Optimize the power parameters of the PTC heater.

[0177] Step 515: The PTC heater enters dynamic power mode, and the power of the PTC heater is increased in multiple compensations.

[0178] Step 516: Based on the gear planning algorithm, obtain the optimal path to achieve peak power and plan the gear change path for the PTC heater.

[0179] Step 516 interacts with step 509.

[0180] Step 516 is followed by step 507.

[0181] In an application scenario, such as Figure 7 As shown, Figure 7This application includes flowcharts illustrating the control method for a PTC heater in some embodiments. The control method includes the following steps:

[0182] Step 601: State quantity acquisition and processing.

[0183] The state parameters include battery temperature, remaining battery charge, remaining battery energy, rated total energy, battery capacity, battery charging rate, estimated current compensation time, and water temperature.

[0184] Step 602: Based on the state variables, perform mode determination to determine whether the battery has entered fast charging mode.

[0185] If so, proceed to step 603.

[0186] Step 603: Confirm that the battery is in fast charging mode.

[0187] Step 604: Determine whether the battery's SOC is greater than or equal to 0.1.

[0188] If not, proceed to step 605; otherwise, proceed to step 608.

[0189] Step 605: Determine that the PTC heater has entered the low SOC heating mode.

[0190] Step 606: The PTC heater executes an upscaling strategy based on the requested current, and the battery is not allowed to discharge during the process.

[0191] Step 607: The maximum allowable charging power of the battery at low temperatures is P. C The charging power requested is P1, and initially P1 = P C During the compensation process, the reserved power for battery charging is P2 (< P1), and the power allocated to the PTC heater is max(P1-P2, P3). When setting parameters, ensure that P1>P3. The target current = requested current + battery charging window demand current - actual charging current. For any insufficient current, the requested current is increased according to 2A / 5S.

[0192] Step 608: Determine that the PTC heater has entered the high SOC heating mode.

[0193] Step 609: The PTC heater enters peak maximum power mode.

[0194] Step 610: Based on the collected status variables, select the optimal peak power level for the PTC heater and plan the PTC heater power levels.

[0195] In some embodiments, the peak power level of the PTC heater can be selected based on the estimated heat exchange power of the battery, the water temperature, and the power level table of the PTC heater.

[0196] The estimated heat exchange power requirement of the battery can be obtained using the following formula: Q 换 =1.2*{V*ρ*C P *(Target water temperature - Current water temperature) / (5*60)+(Q) 总 / 70)*(0.5*(current water temperature + target water temperature)-current battery temperature) / R}.

[0197] Among them, Q 换 Q represents the estimated heat exchange power requirement of the battery, in W; 总 V represents the rated energy of the battery pack, in kWh; V represents the volume of the battery's water circulation system, in cubic meters. 3 ρ is the density of the coolant, in kg / m³. 3 C P R is the specific heat capacity of the coolant, in J / (kg*℃), and R is the total thermal resistance of the 70kWh battery pack, in ℃ / W.

[0198] The target water temperature is specified according to the control strategy. For example, when the battery is in fast charging mode, if the water temperature reaches a target value of 40°C, PID (Proportional-Integral-Derivative) regulation will be used to maintain the target water temperature.

[0199] Step 611: Record and store the current curve of the PTC heater during the gear switching process in real time.

[0200] Step 612: Determine whether the PTC heater has reached its peak power.

[0201] If yes, proceed to step 613; otherwise, proceed to step 614.

[0202] Step 613: The power of the PTC heater has stabilized. The requested current of the battery increases by 2A / 5S until the battery charging current reaches the target current of the battery charging window, and the battery charging compensation ends.

[0203] Step 614: The requested current of the battery is planned based on the recorded current curve. The planned current can be delayed by 5 seconds. The planning objectives include that the rate of change of the battery's remaining energy is less than or equal to 0.05, and that the requested current of the battery does not exceed the actual demand current of the PTC heater.

[0204] According to some embodiments of this application, such as Figure 8 As shown, Figure 8This is a schematic diagram of the structure of a battery device in some embodiments of this application. The battery device 100 includes a memory 101, a processor 102, a PTC heater 103, and a battery 104. The memory 101 stores a computer program, and the processor 102 is used to execute the control method of the PTC heater 103 of any of the above embodiments based on the computer program, which will not be described in detail here.

[0205] Among them, battery 104 includes, but is not limited to, storage batteries, fuel cells, and lead-acid batteries, without any restrictions.

[0206] According to some embodiments of this application, such as Figure 9 As shown, Figure 9 This is a schematic diagram of the vehicle structure in some embodiments of this application. The vehicle 200 includes the battery device 100 described above, which will not be repeated here.

[0207] According to some embodiments of this application, such as Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of a computer-readable storage medium in some embodiments of this application. The computer-readable storage medium 300 stores a computer program 301. When the computer program 301 is executed by the processor 102, it is used to implement the control method of the PTC heater 103 described above, which will not be described in detail here.

[0208] The processor 102 involved in this application may be referred to as a CPU (Central Processing Unit), which may be an integrated circuit chip, or a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.

[0209] The computer-readable storage medium 300 used in this application includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), or optical discs.

[0210] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A control method for a PTC heater, characterized in that, The PTC heater is used to heat the battery when it is being charged at a preset ambient temperature, and the control method includes: In response to the battery's remaining charge being lower than a first preset charge and the battery's current temperature being lower than a first preset temperature, the PTC heater is controlled to switch to a preheating mode to heat the battery. While controlling the PTC heater to switch gears to enter the charging compensation mode, the battery is continuously charged; Obtain the power level table of the PTC heater; Obtain the maximum allowable charging power, the requested charging power, and the reserved charging power of the battery; wherein, the maximum allowable charging power corresponds one-to-one with the remaining charge of the battery, the requested charging power is less than the output power of the charging pile, and the reserved charging power is less than the requested charging power; Obtain the reference power of the PTC heater for heating the battery, where the reference power is less than the maximum allowable charging power; Based on the requested charging power, the reserved charging power, and the reference power, calculate the target power when the PTC heater heats the battery; According to the power level table, the PTC heater is controlled to switch to the level corresponding to the target power in order to cooperate with the battery for charging compensation; In response to the remaining power of the battery being greater than or equal to a second preset power level, the PTC heater is controlled to switch to the maximum power mode to heat the battery; wherein the second preset power level is greater than the first preset power level.

2. The control method according to claim 1, characterized in that, The method further includes: When the PTC heater is in the preheating mode, the current temperature of the battery and the charging window power of the battery are detected in real time. In response to the current temperature being greater than or equal to the first preset temperature and / or the charging window power meeting preset conditions, the PTC heater is controlled to switch gears to cooperate with the battery for charging compensation.

3. The control method according to claim 2, characterized in that, The method further includes: In response to the current temperature being greater than a second preset temperature, the battery is controlled to turn off charging compensation; wherein the second preset temperature is greater than the first preset temperature.

4. The control method according to claim 1, characterized in that, The method further includes: In response to the remaining power of the battery being greater than the first preset power and less than the second preset power, the PTC heater is controlled to switch gears to cooperate with the battery for charging compensation.

5. The control method according to claim 1, characterized in that, The method further includes: In response to the battery's discharge current being greater than a first preset current, it is determined that the remaining charge of the battery is greater than or equal to the second preset charge.

6. The control method according to claim 1, characterized in that, The step of controlling the PTC heater to switch gears to enter preheating mode to heat the battery includes: When the PTC heater is switched to preheating mode, the charging of the battery is disconnected. Obtain the power level table of the PTC heater; The PTC heater is used to heat the battery by controlling the power corresponding to the highest setting in the power setting table; wherein, the power corresponding to the highest setting is the maximum power value corresponding to each setting in the power setting table.

7. The control method according to claim 1, characterized in that, The step of calculating the target power for the PTC heater to heat the battery based on the requested charging power, the reserved charging power, and the reference power includes: Subtract the reserved charging power from the requested charging power to obtain the power difference; The maximum value between the power difference and the reference power is used as the target power when the PTC heater heats the battery.

8. The control method according to claim 1 or 7, characterized in that, During the charging compensation process of the battery, the compensation current during charging compensation is increased or decreased according to a preset size and / or a multiple of the preset size.

9. The control method according to claim 1, characterized in that, The step of controlling the PTC heater to switch to the maximum power mode to heat the battery includes: While controlling the PTC heater to switch gears to enter the maximum power mode, the battery is continuously charged and discharged. The available power of the PTC heater is calculated based on the charging window conversion charging power of the battery, the allowable discharge power of the battery, and the low-voltage load reserved power of the battery. The PTC heater is controlled to heat the PTC heater based on the available power.

10. The control method according to claim 9, characterized in that, The calculation of the available power of the PTC heater based on the charging window conversion charging power of the battery, the allowable discharge power of the battery, and the low-voltage load reserved power of the battery includes: The charging window power of the battery is converted into the charging power and the allowable discharge power of the battery is added to obtain the sum value; Subtracting the low-voltage load reserve power of the battery from the summed value yields the available power of the PTC heater.

11. The control method according to claim 9, characterized in that, The method further includes: In response to the battery's charging window current being less than a second preset current, the requested current of the battery is increased.

12. The control method according to claim 9, characterized in that, The allowable discharge energy loss of the battery is obtained in the following manner: Based on the battery pack's rated energy, SOC, SOE, SOH, and driving range, the permissible discharge energy loss of the battery during the entire process from the start-up of the PTC heater to the completion of compensation is calculated.

13. The control method according to claim 12, characterized in that, The decrease in the SOC of the battery is less than or equal to 0.

01.

14. The control method according to claim 1, characterized in that, The step of controlling the PTC heater to switch to the maximum power mode to heat the battery includes: After controlling the PTC heater to switch to the maximum power mode, obtain the power level table of the PTC heater; In response to the PTC heater not being at the highest setting of the power setting table, the target power of the PTC heater when heating the battery is determined according to the current curve of the PTC heater at each setting of the power setting table, and the PTC heater is controlled to heat the battery based on the target power. In response to the PTC heater being at the highest setting of the power level table, the battery performs charging compensation, and during the charging compensation process, the requested current of the battery is increased by a preset amount and / or a multiple of the preset amount until the requested current reaches the charging window current.

15. The control method according to claim 14, characterized in that, The method further includes: The remaining charge lost by the battery when the PTC heater is in each power level of the power level table is obtained; In response to the remaining power loss being greater than or equal to the target value, the PTC heater is determined to enter the highest setting of the power setting table; In response to the fact that the remaining power loss is less than the target value, it is determined that the PTC heater has not entered the highest setting of the power setting table.

16. The control method according to claim 1, characterized in that, Each setting of the PTC heater corresponds to a specific number of IGBTs that are turned on. When the battery is being charged and compensated, if the compensation current is greater than or equal to the minimum current of the corresponding setting, the PTC heater will enter the corresponding setting.

17. The control method according to claim 1, characterized in that, The method further includes: Obtain the output power of the charging station; Based on the output power, determine whether the battery is in fast charging mode; In response to the battery being in the fast charging mode, it is determined that the battery is being charged at the preset ambient temperature.

18. A battery device, characterized in that, The battery device includes a memory and a processor, as well as a PTC heater and a battery. The memory stores a computer program, and the processor is used to execute the control method according to any one of claims 1-17 based on the computer program.

19. A vehicle, characterized in that, The vehicle includes the battery device as described in claim 18.

20. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, is used to implement the control method as described in any one of claims 1-17.

Images