Charging heating method, charging heating circuit, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a charging heating method and device, electronic equipment and a storage medium, and the method comprises the steps: detecting whether the temperature of a battery pack is greater than a first preset temperature or not when the battery pack is charged; when the temperature of the battery pack is greater than a first preset temperature, determining a request current of the battery pack; when the request current meets a preset condition, closing a heating relay and disconnecting a main negative relay to preheat the battery pack, and detecting whether the temperature of the battery pack is greater than a second preset temperature; if the temperature of the battery pack is greater than a second preset temperature, detecting a voltage difference between an internal total voltage and an external total voltage of the battery pack; when the voltage difference between the internal total voltage and the external total voltage of the battery pack is smaller than the preset value, the main negative relay is closed, the battery pack is charged and heated according to the preset charging strategy, and the scheme can improve the safety of charging and heating.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging, and in particular to a charging heating method, a charging heating circuit, an electronic device and a storage medium. Background Art

[0002] Electric vehicles are vehicles that use onboard power as power, use motors to drive wheels, and comply with various requirements of road traffic and safety regulations. However, current power batteries have poor low-temperature charging performance. When the battery temperature is below 0°C, it is generally necessary to heat the power battery to a suitable temperature before high-power charging. At this time, it is very necessary to heat the battery pack.

[0003] There are currently two mainstream charging and heating solutions: 1. Disconnect the main negative relay during the pure heating process of charging, and close the main negative relay after the temperature reaches the threshold of charging and heating. 2. Do not disconnect the main negative relay during the pure heating process of charging, and ensure that no current is injected into the battery pack by adjusting the requested current. However, in the first solution, the main negative relay is closed when switching from pure heating to charging and heating. If the voltage difference between the external terminal voltage and the internal measured voltage of the main negative relay is relatively large, there is a risk of adhesion when the main negative relay is closed, which may cause a safety accident. In the second solution, if the charging pile does not output according to the request of the BMS, the output current is too large, which will cause current to be injected into the battery pack. Low-temperature charging will affect the safety performance of the battery. The output current is too small, which will cause the battery pack to continue to discharge during the charging process. It can be seen that the safety of existing charging and heating solutions is relatively low. Summary of the invention

[0004] The embodiments of the present application provide a charging heating method, device, electronic device and storage medium, which can improve the safety of charging heating.

[0005] In a first aspect, an embodiment of the present application provides a charging heating method, comprising:

[0006] Detecting whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging;

[0007] When the temperature of the battery pack is greater than a first preset temperature, determining a requested current of the battery pack;

[0008] When the requested current meets the preset condition, the heating relay is closed and the main negative relay is opened to preheat the battery pack, and whether the temperature of the battery pack is greater than a second preset temperature is detected;

[0009] If the temperature of the battery pack is greater than a second preset temperature, detecting a pressure difference between an internal total pressure and an external total pressure of the battery pack;

[0010] When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative relay is closed, and the battery pack is charged and heated according to a preset charging strategy.

[0011] Optionally, in some embodiments of the present application, when the requested current meets a preset condition, the heating relay is closed and the main negative relay is disconnected, and the temperature of the battery pack is detected to see whether it meets a preset temperature, including:

[0012] When the requested current meets the preset condition, the heating relay is closed and the requested current is adjusted to the rated working current of the heating film;

[0013] Detecting whether the main circuit current flowing through the battery pack is less than a preset current value;

[0014] If the main circuit current flowing through the battery pack is less than a preset current value, the main negative relay is disconnected to charge and heat the battery pack, and the temperature of the battery pack is detected to see if it meets the preset temperature.

[0015] Optionally, in some embodiments of the present application, it further includes:

[0016] If the main circuit current flowing through the battery pack is greater than or equal to a preset current value, detecting the charge and discharge state of the battery pack;

[0017] If it is detected that the battery pack has a charging current, the requested current of the battery pack is reduced;

[0018] If it is detected that the battery pack has a discharge current, the requested current of the battery pack is increased.

[0019] Optionally, in some embodiments of the present application, if the temperature of the battery pack is greater than a second preset temperature, detecting a pressure difference between an internal total pressure and an external total pressure of the battery pack includes:

[0020] If the temperature of the battery pack is greater than a second preset temperature, obtaining a charging voltage according to a state of the battery pack and a charging strategy;

[0021] Adjusting the charging voltage to the total internal voltage of the battery pack, and adjusting the requested current to a first preset operating current;

[0022] After adjustment, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected.

[0023] Optionally, in some embodiments of the present application, it further includes:

[0024] If the temperature of the battery pack is less than or equal to the second preset temperature, the battery pack continues to be charged and heated according to the current current.

[0025] Optionally, in some embodiments of the present application, when the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative relay is closed, and the battery pack is charged and heated according to a preset charging strategy, including:

[0026] When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative pre-charge relay is closed to pre-charge the battery pack;

[0027] When the battery pack is pre-charged successfully, the main negative relay is closed, and the main negative pre-charge relay is disconnected after a first preset time;

[0028] adjusting the requested voltage to the maximum charging voltage, and;

[0029] Adjusting the requested current to a second preset operating current;

[0030] The battery pack is charged and heated based on the maximum charging voltage and the second preset operating current.

[0031] Optionally, in some embodiments of the present application, it further includes:

[0032] If the pressure difference between the internal total pressure and the external total pressure of the battery pack is greater than or equal to a preset value, closing the main negative pre-charge relay after a second preset time to pre-charge the battery pack;

[0033] If the pre-charging of the battery pack fails, the charging process is terminated.

[0034] In a second aspect, the present application further provides a charging heating circuit, applying any of the above charging heating methods, including:

[0035] A charging circuit, wherein the charging circuit is provided with a main positive relay, a power supply and a main negative relay, one end of the main positive relay is connected to one end of the power supply through a first node, the other end of the main positive relay is connected to a battery pack through a second node, one end of the main negative relay is connected to the other end of the power supply through a third node, and the other end of the main negative relay is connected to the battery pack through a fourth node;

[0036] a first pre-filling branch, wherein the first pre-filling branch is provided with a main positive pre-filling relay and a first pre-filling resistor, one end of the main positive pre-filling relay is connected to the first node, the other end of the main positive pre-filling relay is connected to one end of the first pre-filling resistor, and the other end of the first pre-filling resistor is connected to the second node;

[0037] a second pre-filling branch, wherein the second pre-filling branch is provided with a main negative pre-filling relay and a second pre-filling resistor, one end of the main negative pre-filling relay is connected to the third node, the other end of the main negative pre-filling relay is connected to one end of the second pre-filling resistor, and the other end of the second pre-filling resistor is connected to the fourth node;

[0038] A heating branch is provided with a heating relay and a heating film, one end of the heating relay is connected to the first node, the other end of the heating relay is connected to one end of the heating film, and the other end of the heating film is connected to the fourth node.

[0039] Correspondingly, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the charging and heating method as described in any one of the above are performed.

[0040] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above-mentioned charging and heating methods are implemented.

[0041] Embodiments of the present application provide a charging heating method, a charging heating circuit, an electronic device, and a storage medium, which detect whether the temperature of a battery pack is greater than a first preset temperature when the battery pack is charging. When the temperature of the battery pack is greater than the first preset temperature, the requested current of the battery pack is determined. When the requested current meets a preset condition, the heating relay is closed and the main negative relay is disconnected for charging, and it is detected whether the temperature of the battery pack is greater than a second preset temperature. If the temperature of the battery pack is greater than the second preset temperature, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative relay is closed, and the battery pack is charged and heated according to a preset charging strategy. The charging and heating solution provided in the present application closes the heating relay and disconnects the main negative relay to preheat the battery pack when the requested current meets the preset conditions. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed to charge and heat the battery pack. This can reduce the impact current at the moment the main negative relay is closed, avoid safety accidents caused by relay sticking, and thus improve the safety of charging and heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a schematic diagram of the flow of the charging heating method provided in an embodiment of the present application;

[0044] Figure 2 is a schematic diagram of the structure of the charging heating circuit provided in an embodiment of the present application;

[0045] Figure 3 is another schematic diagram of the charging heating method provided in an embodiment of the present application;

[0046] Figure 4 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0048] Embodiments of the present application provide a charging heating method, device, electronic device, and storage medium.

[0049] Among them, the charging and heating device can be specifically integrated in a terminal, the terminal can include a tablet computer or a personal computer (PC), the terminal can establish a wired or wireless connection with a server, the server can include an independently operated server or a distributed server, and can also include a server cluster composed of multiple servers.

[0050] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0051] A charging and heating method comprises: detecting whether the temperature of a battery pack is greater than a first preset temperature when the battery pack is charging; when the temperature of the battery pack is greater than the first preset temperature, determining the requested current of the battery pack; when the requested current satisfies a preset condition, closing a heating relay and disconnecting a main negative relay to preheat the battery pack, and detecting whether the temperature of the battery pack is greater than a second preset temperature; if the temperature of the battery pack is greater than the second preset temperature, detecting the pressure difference between the internal total pressure and the external total pressure of the battery pack; when the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, closing the main negative relay, and charging and heating the battery pack according to a preset charging strategy.

[0052] See also Figure 1 , Figure 1 This is a schematic diagram of the process of the charging heating method provided in the embodiment of the present application. The specific process of the charging heating method can be as follows:

[0053] 101. Detect whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging.

[0054] For example, the battery management system (BMS) can be used to detect whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging, wherein the BMS is configured with a temperature sensor for monitoring the temperature inside the battery pack in real time. The first preset temperature is a preset temperature threshold used to determine whether the battery pack is in a state suitable for charging. Optionally, in some embodiments of the present application, the first preset temperature is lower than the maximum safe operating temperature of the battery to ensure that the battery does not overheat during the charging process. If the temperature of the battery pack is greater than the first preset temperature, execute step 102.

[0055] 102. When the temperature of the battery pack is greater than a first preset temperature, determine a requested current of the battery pack.

[0056] The requested current refers to the current demand signal sent by the BMS to the charging pile or power supply. For example, when the temperature of the battery pack is greater than the first preset temperature, the BMS can send a current demand signal to the charging pile or power supply based on the current state of the battery pack and the charging strategy, thereby determining the requested current of the battery pack.

[0057] For example, specifically, the BMS first evaluates the status of the battery pack, including voltage, temperature, remaining power, health status, etc. Based on the status of the battery and the needs of the user, the BMS formulates a charging strategy, including fast charging, slow charging, or charging mode at a specific temperature. The BMS calculates the appropriate charging current based on the charging strategy and the status of the battery. This current value takes into account factors such as the maximum charging rate of the battery, the temperature sensitivity of the battery, and the aging of the battery. The BMS sends a signal requesting current to the charging pile through a communication protocol (such as the CAN bus). After receiving the request from the BMS, the charging pile adjusts its output current to match the request from the BMS. During the charging process, the BMS continuously monitors the status of the battery pack and dynamically adjusts the requested current as needed. For example, if the temperature of the battery pack rises, the BMS may reduce the requested current to prevent overheating. In some cases, the BMS may adjust the requested current before closing the main negative relay to reduce the voltage difference, thereby reducing the risk of adhesion.

[0058] 103. When the requested current meets the preset condition, the heating relay is closed and the main negative relay is opened to preheat the battery pack, and it is detected whether the temperature of the battery pack is greater than the second preset temperature.

[0059] An appropriate requested current is calculated based on the battery pack status and charging strategy. When this requested current meets the preset conditions (for example, the current value is within the safe range and the battery pack has reached the temperature at which charging can begin), the BMS will proceed to the next step. If the battery pack needs to be heated to meet the charging conditions, the BMS will close the heating relay and start the heating process. During the heating process, the BMS will disconnect the main negative relay to ensure that the current does not flow directly into the battery pack, but is used for heating.

[0060] Furthermore, when preheating the battery pack, detect whether the temperature of the battery pack is greater than the second preset temperature. If the temperature of the battery pack is greater than the second preset temperature, execute step 103; if the temperature is less than or equal to the second preset temperature, continue preheating until the temperature of the battery pack is greater than the second preset temperature.

[0061] Optionally, in some embodiments of the present application, the step of “when the requested current meets the preset condition, closing the heating relay and disconnecting the main negative relay to preheat the battery pack, and detecting whether the temperature of the battery pack is greater than the second preset temperature” may specifically include:

[0062] When the requested current meets the preset conditions, the heating relay is closed and the requested current is adjusted to the rated working current of the heating film;

[0063] Detect whether the main circuit current flowing through the battery pack is less than the preset current value;

[0064] If the main circuit current flowing through the battery pack is less than the preset current value, the main negative relay is disconnected to charge and heat the battery pack, and the temperature of the battery pack is detected to see if it meets the second preset temperature.

[0065] For example, specifically, when the requested current meets the preset conditions, the BMS closes the heating relay to start the heating film, thereby increasing the temperature of the battery pack. The BMS then adjusts the requested current to the rated operating current of the heating film, which is the current value required for the normal operation of the heating film. The BMS continuously monitors the main loop current flowing through the battery pack to ensure that the main loop current does not exceed the preset current value. If the detected main loop current is less than the preset current value, this indicates that the battery pack is being heated at a lower current and does not exceed the safety limit. When the main loop current is less than the preset current value, the BMS disconnects the main negative relay to avoid charging the battery pack during the heating process. After the main negative relay is disconnected, the BMS continues to monitor the heating status of the battery pack to ensure that the heating process proceeds as expected. If the temperature of the battery pack meets the second preset temperature, the BMS decides whether to start or continue the charging process based on the charging strategy.

[0066] Optionally, in some embodiments of the present application, the charging heating method may further include:

[0067] If the main circuit current flowing through the battery pack is greater than or equal to the preset current value, the charge and discharge status of the battery pack is detected;

[0068] If it is detected that the battery pack has a charging current, the requested current of the battery pack is reduced;

[0069] If it is detected that the battery pack has a discharge current, the requested current of the battery pack is increased.

[0070] For example, specifically, the BMS continuously monitors the main circuit current flowing through the battery pack. If the detected main circuit current is greater than or equal to the preset current value, the BMS will further detect the charge and discharge status of the battery pack. The BMS uses current sensors or other monitoring devices to determine whether the battery pack is currently in a charging state or a discharging state. If it is detected that the battery pack has a charging current, that is, the battery pack is receiving current for charging, the BMS will reduce the requested current. This is to control the charging rate and prevent the battery pack from overheating or damage due to excessive charging. If it is detected that the battery pack has a discharging current, that is, the battery pack is releasing current, it may be because the battery pack is powering the vehicle or other loads, and the BMS will increase the requested current. This is to compensate for the discharge current and ensure that the battery pack can maintain the required level of charge. While adjusting the requested current, the BMS will take measures to prevent the main negative relay from sticking, such as closing the pre-charge relay before closing the main negative relay.

[0071] 104. If the temperature of the battery pack is greater than a second preset temperature, detect the pressure difference between the internal total pressure and the external total pressure of the battery pack.

[0072] For example, when the battery pack temperature is greater than the second preset temperature, the BMS will detect the pressure difference between the internal total pressure and the external total pressure of the battery pack. The internal total pressure refers to the total voltage inside the battery pack, while the external total pressure may refer to the voltage of the external circuit of the battery pack or the charging pile. The BMS determines whether the pressure difference between the internal total pressure and the external total pressure is less than a preset value. This preset value is based on the design and safety considerations of the battery pack to ensure that the voltage difference does not cause excessive current shock when the main negative relay is closed. If the pressure difference is less than the preset value, the BMS will close the main negative relay and execute step 105.

[0073] Optionally, in some embodiments of the present application, the step of “if the temperature of the battery pack is greater than the second preset temperature, detecting the pressure difference between the internal total pressure and the external total pressure of the battery pack” may specifically include:

[0074] If the temperature of the battery pack is greater than the second preset temperature, obtaining a charging voltage according to the state of the battery pack and a charging strategy;

[0075] Adjusting the charging voltage to the total internal voltage of the battery pack, and adjusting the requested current to a first preset operating current;

[0076] After adjustment, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected.

[0077] For example, specifically, a suitable charging voltage is determined according to the current state of the battery pack and the preset charging strategy. Then, the charging voltage is adjusted to the internal total voltage of the battery pack, so that the voltage difference between the internal and external circuits of the battery pack can be reduced, thereby reducing current shock and heat generation. At the same time, the requested current is adjusted to the first preset operating current to avoid overheating.

[0078] Optionally, in some embodiments of the present application, the charging heating method may further include:

[0079] If the temperature of the battery pack is less than or equal to the second preset temperature, the battery pack continues to be charged and heated according to the current current.

[0080] 105. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed, and the battery pack is charged and heated according to the preset charging strategy.

[0081] For example, when the detected voltage difference is less than the preset value, the BMS will close the main negative relay. Allowing current to flow from the external circuit into the battery pack to start the charging process. After closing the main negative relay, the BMS will charge the battery pack according to the preset charging strategy. During the charging process, the BMS can start the heating system to achieve the purpose of heating and charging.

[0082] Optionally, in some embodiments of the present application, the step of “when the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, closing the main negative relay, and charging and heating the battery pack according to a preset charging strategy” may specifically include:

[0083] When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative pre-charge relay is closed to pre-charge the battery pack;

[0084] When the battery pack is pre-charged successfully, the main negative relay is closed, and the main negative pre-charge relay is disconnected after a first preset time;

[0085] adjusting the requested voltage to a maximum charging voltage, and adjusting the requested current to a second preset operating current;

[0086] Based on the maximum charging voltage and the second preset operating current, the battery pack is charged and heated.

[0087] For example, specifically, when the voltage difference is less than the preset value, the BMS first closes the main negative pre-charge relay and starts pre-charging the battery pack. Pre-charging is a small current charging process used to prepare the battery pack to accept a larger charging current. After the pre-charging is successful, the BMS closes the main negative relay to allow a larger charging current to flow into the battery pack. After a first preset time (for example, 100ms), the BMS disconnects the main negative pre-charge relay. This time interval may be used to ensure that the battery pack stabilizes after closing the main negative relay. The BMS adjusts the requested voltage to the maximum charging voltage, which is the maximum voltage that the battery pack can safely accept. At the same time, the requested current is adjusted to the second preset operating current, which is the current value used for normal charging after pre-charging. Based on the adjusted maximum charging voltage and the second preset operating current, the BMS begins to charge and heat the battery pack to ensure that the battery pack is charged at an appropriate temperature.

[0088] Optionally, in some embodiments of the present application, the charging heating method may further include:

[0089] If the pressure difference between the internal total pressure and the external total pressure of the battery pack is greater than or equal to a preset value, the main negative pre-charge relay is closed after a second preset time to pre-charge the battery pack;

[0090] If the pre-charging of the battery pack fails, the charging process ends.

[0091] When the pressure difference is greater than the preset value, the BMS will wait for a second preset time (e.g. 10 seconds) before closing the main negative pre-charge relay. This delay may be to give the battery pack some time to adjust its state so that the pressure difference can be reduced to a safe range. After the second preset time, the BMS closes the main negative pre-charge relay and starts pre-charging the battery pack. If the pre-charge fails, that is, the battery pack does not meet the conditions for successful pre-charge, the BMS will end the charging process to protect the battery pack from damage.

[0092] To further understand the charging heating method of this application, please refer to Figure 2 and Figure 3 The present application also provides a charging heating circuit, which applies the charging heating method of any of the above embodiments, specifically as follows:

[0093] The charging and heating circuit includes a charging circuit, a first pre-charging branch, a second pre-charging branch and a heating branch, wherein the charging circuit is provided with a main positive relay 201, a power supply 202 and a main negative relay 203, one end of the main positive relay 201 is connected to one end of the power supply 202 through a first node a, the other end of the main positive relay 201 is connected to the battery pack through a second node b, one end of the main negative relay 203 is connected to the other end of the power supply through a third node c, and the other end of the main negative relay 203 is connected to the battery pack through a fourth node d; the first pre-charging branch is provided with a main positive pre-charging relay 204 and a first pre-charging resistor 205, one end of the main positive pre-charging relay 204 is connected to the first node a, and the main positive pre-charging resistor 205 is connected to the first node a. The other end of the relay 204 is connected to one end of the first pre-charging resistor 205, and the other end of the first pre-charging resistor 205 is connected to the second node b; the second pre-charging branch is provided with a main negative pre-charging relay 206 and a second pre-charging resistor 207, one end of the main negative pre-charging relay 206 is connected to the third node c, the other end of the main negative pre-charging relay 206 is connected to one end of the second pre-charging resistor 207, and the other end of the second pre-charging resistor 208 is connected to the fourth node d; the heating branch is provided with a heating relay 208 and a heating film 209, one end of the heating relay is connected to the first node a, the other end of the heating relay 208 is connected to one end of the heating film 209, and the other end of the heating film 209 is connected to the fourth node d.

[0094] When the battery pack is in a low temperature state and the charging process begins, the temperature meets the pure heating conditions for charging. After the battery pack is plugged in, the BMS first closes the main negative relay and then the main positive pre-charge relay according to the high-voltage charging process. After the pre-charge is successful (the difference between the internal total pressure HV_A and the external total pressure HV_D is less than 10V), the main positive relay is closed. After the main positive relay is closed successfully, the main positive pre-charge relay is disconnected, which indicates that the battery pack is powered on successfully.

[0095] After successful power-on, BMS requests the charging pile to output 5A current. When BMS receives that the output current of the charging pile is greater than 2A or the current sensor detects that a current greater than 2A is injected into the battery pack, the heating relay is immediately closed. After the heating relay is closed, BMS requests the charging pile to output a current equal to the rated working current of the heating film. When the absolute value of the loop current is less than 5A, the main negative relay is immediately cut off, and the charging enters a pure heating state. If the current does not always meet the requirement of less than 5A, dynamic current adjustment is entered (dynamic current adjustment strategy: if there is charging current, the requested current is reduced; if the battery pack is discharged, the requested current is increased). If the current is not less than 5A for 2 minutes, the charging process is terminated.

[0096] After heating for a period of time, the temperature threshold meets the conditions for charging and heating at the same time. At this time, the BMS charging request voltage is adjusted to the internal total pressure (HV_A), and the request current is the MAP table current plus the rated working current of the heating film. When the BMS detects that the pressure difference between the internal total pressure (HV_A) and the external total pressure (HV_D) is less than 10V, the main negative pre-charge relay is immediately closed. When the pressure difference between the internal total pressure (HV_A) and the external total pressure (HV_D) does not meet the conditions, the main negative pre-charge relay is closed after a delay of 10s. After the main negative pre-charge relay is closed, it detects whether the pressure difference meets the conditions. If the conditions are met, the main negative relay is closed, and then the main negative pre-charge relay is disconnected after 100ms. If the conditions are not met, the charging process ends. .

[0097] At this time, the system enters the charging and heating state, adjusts the BMS charging request voltage to the maximum allowable charging voltage, and adjusts the BMS charging current to the MAP current + the rated working current of the heating film.

[0098] The embodiment of the present application provides a charging and heating method, which detects whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging. When the temperature of the battery pack is greater than the first preset temperature, the requested current of the battery pack is determined. When the requested current meets the preset conditions, the heating relay is closed and the main negative relay is disconnected for charging, and the temperature of the battery pack is detected to be greater than a second preset temperature. If the temperature of the battery pack is greater than the second preset temperature, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed, and the battery pack is charged and heated according to the preset charging strategy. The charging and heating scheme provided by the present application, when the requested current meets the preset conditions, the heating relay is closed and the main negative relay is disconnected to preheat the battery pack. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed to charge and heat the battery pack. The impact current at the moment of closing the main negative relay can be reduced to avoid relay adhesion and safety accidents. Thus, the safety of charging and heating can be improved.

[0099] In addition, the present application also provides an electronic device, such as Figure 4 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0100] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 4 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0101] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0102] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and charging and heating by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0103] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0104] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0105] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0106] Detect whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging; when the temperature of the battery pack is greater than the first preset temperature, determine the requested current of the battery pack; when the requested current meets the preset conditions, close the heating relay and disconnect the main negative relay to preheat the battery pack, and detect whether the temperature of the battery pack is greater than a second preset temperature; if the temperature of the battery pack is greater than the second preset temperature, detect the pressure difference between the internal total pressure and the external total pressure of the battery pack; when the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, close the main negative relay, and charge and heat the battery pack according to the preset charging strategy.

[0107] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0108] The embodiment of the present application detects whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging. When the temperature of the battery pack is greater than the first preset temperature, the requested current of the battery pack is determined. When the requested current meets the preset conditions, the heating relay is closed and the main negative relay is disconnected for charging, and the temperature of the battery pack is detected to be greater than a second preset temperature. If the temperature of the battery pack is greater than the second preset temperature, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed, and the battery pack is charged and heated according to the preset charging strategy. The charging and heating scheme provided by the present application, when the requested current meets the preset conditions, the heating relay is closed and the main negative relay is disconnected to preheat the battery pack. When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than the preset value, the main negative relay is closed to charge and heat the battery pack. This can reduce the impact current at the moment of closing the main negative relay, avoid relay adhesion and cause safety accidents, thereby improving the safety of charging and heating.

[0109] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0110] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any charging heating method provided in the embodiment of the present application. For example, the instructions can execute the following steps:

[0111] Detect whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging; when the temperature of the battery pack is greater than the first preset temperature, determine the requested current of the battery pack; when the requested current meets the preset conditions, close the heating relay and disconnect the main negative relay to preheat the battery pack, and detect whether the temperature of the battery pack is greater than a second preset temperature; if the temperature of the battery pack is greater than the second preset temperature, detect the pressure difference between the internal total pressure and the external total pressure of the battery pack; when the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, close the main negative relay, and charge and heat the battery pack according to the preset charging strategy.

[0112] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0113] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0114] Since the instructions stored in the storage medium can execute the steps in any charging and heating method provided in the embodiments of the present application, the beneficial effects that can be achieved by any charging and heating method provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0115] The above is a detailed introduction to a charging heating method, device, electronic device and storage medium provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A charging heating method, characterized in that: include: Detecting whether the temperature of the battery pack is greater than a first preset temperature when the battery pack is charging; When the temperature of the battery pack is greater than a first preset temperature, determining a requested current of the battery pack; When the requested current meets the preset condition, the heating relay is closed and the main negative relay is opened to preheat the battery pack, and whether the temperature of the battery pack is greater than a second preset temperature is detected; If the temperature of the battery pack is greater than a second preset temperature, detecting a pressure difference between an internal total pressure and an external total pressure of the battery pack; When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative relay is closed, and the battery pack is charged and heated according to a preset charging strategy.

2. The charging heating method according to claim 1, characterized in that: When the requested current meets the preset condition, the heating relay is closed and the main negative relay is opened to preheat the battery pack, and the temperature of the battery pack is detected to be greater than a second preset temperature, including: When the requested current meets the preset condition, the heating relay is closed and the requested current is adjusted to the rated working current of the heating film; Detecting whether the main circuit current flowing through the battery pack is less than a preset current value; If the main circuit current flowing through the battery pack is less than a preset current value, the main negative relay is disconnected to charge and heat the battery pack, and the temperature of the battery pack is detected to see if it meets a second preset temperature.

3. The charging heating method according to claim 2, characterized in that: Also includes: If the main circuit current flowing through the battery pack is greater than or equal to a preset current value, detecting the charge and discharge state of the battery pack; If it is detected that the battery pack has a charging current, the requested current of the battery pack is reduced; If it is detected that the battery pack has a discharge current, the requested current of the battery pack is increased.

4. The charging heating method according to claim 1, characterized in that: If the temperature of the battery pack is greater than a second preset temperature, detecting a pressure difference between an internal total pressure and an external total pressure of the battery pack includes: If the temperature of the battery pack is greater than a second preset temperature, obtaining a charging voltage according to a state of the battery pack and a charging strategy; Adjusting the charging voltage to the total internal voltage of the battery pack, and adjusting the requested current to a first preset operating current; After adjustment, the pressure difference between the internal total pressure and the external total pressure of the battery pack is detected.

5. The charging heating method according to claim 4, characterized in that: Also includes: If the temperature of the battery pack is less than or equal to the second preset temperature, the battery pack continues to be charged and heated according to the current current.

6. The charging heating method according to claim 1, characterized in that: When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative relay is closed, and the battery pack is charged and heated according to a preset charging strategy, including: When the pressure difference between the internal total pressure and the external total pressure of the battery pack is less than a preset value, the main negative pre-charge relay is closed to pre-charge the battery pack; When the battery pack is pre-charged successfully, the main negative relay is closed, and the main negative pre-charge relay is disconnected after a first preset time; adjusting the requested voltage to the maximum charging voltage, and; Adjusting the requested current to a second preset operating current; The battery pack is charged and heated based on the maximum charging voltage and the second preset operating current.

7. The charging heating method according to claim 6, characterized in that: Also includes: If the pressure difference between the internal total pressure and the external total pressure of the battery pack is greater than or equal to a preset value, closing the main negative pre-charge relay after a second preset time to pre-charge the battery pack; If the pre-charging of the battery pack fails, the charging process is terminated.

8. A charging heating circuit, applying the charging heating method according to any one of claims 1 to 7, characterized in that: include: A charging circuit, wherein the charging circuit is provided with a main positive relay, a power supply and a main negative relay, one end of the main positive relay is connected to one end of the power supply through a first node, the other end of the main positive relay is connected to a battery pack through a second node, one end of the main negative relay is connected to the other end of the power supply through a third node, and the other end of the main negative relay is connected to the battery pack through a fourth node; a first pre-filling branch, wherein the first pre-filling branch is provided with a main positive pre-filling relay and a first pre-filling resistor, one end of the main positive pre-filling relay is connected to the first node, the other end of the main positive pre-filling relay is connected to one end of the first pre-filling resistor, and the other end of the first pre-filling resistor is connected to the second node; a second pre-filling branch, wherein the second pre-filling branch is provided with a main negative pre-filling relay and a second pre-filling resistor, one end of the main negative pre-filling relay is connected to the third node, the other end of the main negative pre-filling relay is connected to one end of the second pre-filling resistor, and the other end of the second pre-filling resistor is connected to the fourth node; A heating branch is provided with a heating relay and a heating film, one end of the heating relay is connected to the first node, the other end of the heating relay is connected to one end of the heating film, and the other end of the heating film is connected to the fourth node.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the charging heating method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the charging and heating method according to any one of claims 1 to 7 are implemented.

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