Power battery heating method, device and equipment, storage medium and computer program product

Abstract

The invention discloses a power battery heating method, device and equipment, a storage medium and a computer program product, and relates to the technical field of vehicle charging, and the method comprises the steps: determining a heating mode corresponding to a power battery according to the cell temperature of the power battery when a charging request for the power battery is received; the first heating loop and / or the second heating loop are / is controlled according to the heating mode and the power of the charging gun, the first heating film and the second heating film are arranged in the battery lower box body and used for heating the power battery, and the power of the first heating film or the second heating film is smaller than the minimum power of the charging gun. The first heating film and the second heating film of which the power is smaller than the lowest charging gun power are arranged in the battery lower box body; a first heating loop formed by connecting a first heating film and a first heating relay in series and a second heating loop formed by connecting a second heating film and a second heating relay in series are configured according to the power of the charging gun so as to be compatible with the low-power charging gun to heat the power battery.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle charging, and in particular, to a method, device, equipment, storage medium, and computer program product for heating a power battery. Background Art

[0002] With the rapid development of the global new energy vehicle market, the market share of new energy vehicles has been increasing year by year, and the market has higher and higher requirements for the performance of power batteries. Since the charge and discharge performance of power batteries is significantly limited in low-temperature environments (such as battery capacity attenuation, battery discharge capacity decline, and charging efficiency reduction), existing technologies often heat the power battery through a heating film before charging.

[0003] However, in low-temperature scenarios, the power provided by some slow charging guns is not sufficient to support the operation of the heating film (for example, a 3.3 kw slow charging gun cannot support a 4.5 kw heating film), which makes the power battery unable to get out of the low-temperature environment, and thus unable to use the slow charging gun to charge the power battery. Therefore, there is an urgent need in the industry for a method for heating a power battery that can be compatible with low-power charging guns. Summary of the Invention

[0004] The main purpose of the present application is to provide a method, device, equipment, storage medium, and computer program product for heating a power battery, aiming to solve the technical problem that the existing power battery heating method cannot be compatible with low-power charging guns.

[0005] To achieve the above purpose, the present application provides a method for heating a power battery. The method is applied to a power battery heating system. The power battery heating system at least includes a first heating circuit formed by connecting a first heating film and a first heating relay in series, and a second heating circuit formed by connecting a second heating film and a second heating relay in series. The first heating circuit and the second heating circuit are connected in parallel. The method includes the following steps:

[0006] When a charging request for the power battery is received, determine the heating mode corresponding to the power battery according to the core temperature of the power battery;

[0007] Control the first heating circuit and / or the second heating circuit according to the heating mode and the power of the charging gun. The first heating film and the second heating film are arranged in the lower box of the battery to heat the power battery. The power of the first heating film or the second heating film is less than the minimum power of the charging gun.

[0008] In one embodiment, the power battery heating system further includes a main negative relay, and the main negative relay is used to control the on and off of the negative pole of the power battery. The step of controlling the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power includes:

[0009] If the heating mode is the first heating mode, disconnect the main negative relay to cut off the charging circuit of the power battery;

[0010] When the charging gun power is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to perform the first heating mode in the full power state on the power battery;

[0011] When the charging gun power is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to perform the first heating mode in the half power state on the power battery.

[0012] In one embodiment, the step of controlling the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power further includes:

[0013] If the heating mode is the second heating mode, close the main negative relay to connect the charging circuit of the power battery;

[0014] When the charging gun power is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to perform the second heating mode in the full power state on the power battery;

[0015] When the charging gun power is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to perform the second heating mode in the half power state on the power battery.

[0016] In one embodiment, the step of determining the heating mode corresponding to the power battery according to the cell temperature of the power battery includes:

[0017] If the cell temperature of the power battery is less than the first preset temperature, it is determined that the heating mode corresponding to the power battery is the first heating mode;

[0018] If the cell temperature of the power battery is greater than or equal to the first preset temperature and less than the second preset temperature, it is determined that the heating mode corresponding to the power battery is the second heating mode.

[0019] In one embodiment, the power battery heating system further includes a pre-charge relay and a main positive relay. The pre-charge relay is used to control the on / off of the power battery pre-charge circuit, and the main positive relay is used to control the on / off of the positive pole of the power battery. After the step of determining the heating mode corresponding to the power battery according to the cell temperature of the power battery, the following steps are further included:

[0020] Close the main negative relay and the pre-charge relay to connect the pre-charge circuit of the power battery for capacitor pre-charging;

[0021] After the pre-charging is completed, close the main positive relay and disconnect the pre-charge relay.

[0022] In one embodiment, the power battery heating method further includes:

[0023] If the cell temperature of the power battery is greater than or equal to the second preset temperature, disconnect the first heating relay and the second heating relay to cut off the first heating circuit and the second heating circuit.

[0024] In addition, to achieve the above object, the present application further provides a power battery heating device. The device is applied to a power battery heating system. The power battery heating system at least includes a first heating circuit formed by a first heating film and a first heating relay connected in series, and a second heating circuit formed by a second heating film and a second heating relay connected in series. The first heating circuit is in parallel with the second heating circuit. The power battery heating device includes:

[0025] A mode judgment module, configured to determine the heating mode corresponding to the power battery according to the cell temperature of the power battery when receiving a charging request for the power battery;

[0026] A heating control module, configured to control the first heating film and / or the second heating film according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the battery lower box body to heat the power battery, and the power of the first heating film or the second heating film is less than the minimum charging gun power.

[0027] In addition, to achieve the above object, the present application further provides a power battery heating device. The device includes: a memory, a processor, and a power battery heating program stored on the memory and executable on the processor. The power battery heating program is configured to implement the steps of the power battery heating method as described above.

[0028] In addition, to achieve the above object, the present application further provides a storage medium, which is a computer-readable storage medium. A power battery heating program is stored on the storage medium. When the power battery heating program is executed by a processor, the steps of the power battery heating method described above are implemented.

[0029] In addition, to achieve the above object, the present invention further provides a computer program product, which includes a power battery heating program. When the power battery heating program is executed by a processor, the steps of the power battery heating method described above are implemented.

[0030] When the present application receives a charging request for the power battery, it determines the heating mode corresponding to the power battery according to the core temperature of the power battery; controls the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the lower battery box to heat the power battery, and the power of the first heating film or the second heating film is less than the minimum charging gun power. The above method of the present application arranges the first heating film and the second heating film with power less than the minimum charging gun power in the lower battery box, and flexibly configures the first heating circuit composed of the first heating film and the first heating relay in series and / or the second heating circuit composed of the second heating film and the second heating relay in series according to the charging gun power, thereby achieving the technical effect of being able to heat the power battery in compatibility with a low-power charging gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for describing the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic flowchart of the first embodiment of the power battery heating method of the present application;

[0034] Figure 2 It is a schematic diagram of the arrangement of the heating film of the power battery heating method of the present application;

[0035] Figure 3 It is a schematic flowchart of the second embodiment of the power battery heating method of the present application;

[0036] Figure 4Schematic flowchart of the third embodiment of the power battery heating method of the present application;

[0037] Figure 5 Schematic diagram of the power battery heating system of the power battery heating method of the present application;

[0038] Figure 6 Block diagram of the structure of the first embodiment of the power battery heating device of the present application;

[0039] Figure 7 Schematic diagram of the structure of the power battery heating device in the hardware operating environment related to the solution of the embodiment of the present application.

[0040] The implementation, functional features, and advantages of the purpose of the present application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0041] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0042] It should be noted that the execution subject of the embodiment of the present application can be a computing service device with data processing, network communication, and program running functions, such as a vehicle-mounted terminal, a personal computer, a mobile phone, etc., or an electronic device capable of implementing the above functions, such as the above-mentioned power battery heating device. The following describes the following embodiments by taking the power battery heating device as an example.

[0043] The embodiment of the present application provides a power battery heating method, referring to Figure 1 , Figure 1 Schematic flowchart of the first embodiment of the power battery heating method of the present application.

[0044] In this embodiment, the power battery heating method is applied to a power battery heating system. The power battery heating system at least includes a first heating circuit formed by connecting a first heating film and a first heating relay in series, and a second heating circuit formed by connecting a second heating film and a second heating relay in series. The first heating circuit and the second heating circuit are connected in parallel. The method includes the following steps:

[0045] Step S10: When a charging request for the power battery is received, determine the heating mode corresponding to the power battery according to the cell temperature of the power battery.

[0046] It should be noted that the above-mentioned first heating film and second heating film are thin-film heating elements used to provide heat for power batteries in low-temperature environments. They convert electrical energy into heat energy to raise the battery temperature to an appropriate operating range, thereby ensuring the performance, lifespan, and safety of the battery under low-temperature conditions. The above-mentioned first heating relay and second heating relay are switching elements used to control the on / off of the corresponding heating circuits of the heating films.

[0047] It should be understood that the above-mentioned charging request can be actively issued by the user or automatically generated by the above-mentioned power battery heating device when it detects that a charging gun is inserted into the vehicle charging port.

[0048] It can be understood that the above-mentioned heating modes can include pure heating mode, heating while charging mode, etc., and this embodiment does not limit this. Since the charging effect corresponding to the power battery at different temperatures is different, an appropriate heating mode can be selected based on the charging effect corresponding to the core temperature of the power battery. Specifically, battery manufacturers usually conduct relevant tests on the power batteries to be shipped to obtain the relationship between the core temperature, charging effect, and heating mode. Therefore, this embodiment can refer to the above relationship when selecting an appropriate heating mode, which will not be elaborated here.

[0049] In specific implementation, when the heating mode corresponding to the power battery is determined, the corresponding voltage and current can be requested through the BMS (Battery Management System). The first heating relay and the second heating relay are sequentially closed at intervals of 10 ms, and after waiting for the PTC (Positive Temperature Coefficient) spike to pass, the cutting off and turning on of the above-mentioned first heating circuit and / or second heating circuit are controlled according to the charging gun power provided by the OBC (On Board Charger).

[0050] Step S20: Control the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the battery lower box to heat the power battery, and the power of the first heating film or the second heating film is less than the minimum charging gun power.

[0051] It should be noted that the above charging gun power refers to the ability of the charging gun to transfer electric energy to the power battery per unit time, usually measured in kilowatts (kW). The above minimum charging gun power can refer to the lowest charging power among all charging guns adapted to the above power battery. Exemplarily, assuming that the power battery installed in a certain vehicle supports three types of charging guns with powers of 3.5 kW, 5.7 kW, and 6.6 kW, the corresponding above minimum charging gun power is 3.5 kW.

[0052] It should be understood that by controlling the opening and closing of the above first heating relay, the on / off of the first heating circuit can be controlled, so as to realize heating the power battery with / without using the first heating film; by controlling the opening and closing of the above second heating relay, the on / off of the second heating circuit can be controlled, so as to realize heating the power battery with / without using the second heating film. Further, by connecting the first heating circuit and the second heating circuit in parallel, the first heating film can be called alone, or the second heating film can be called alone, or the first heating film and the second heating film can be called simultaneously to heat the power battery, so as to realize segmented adjustment of the heating power, and the total heating power can be adjusted by controlling the number of enabled heating films.

[0053] In addition, in order to ensure that the first heating circuit and the second heating circuit can uniformly heat the battery cells of the power battery, the first heating film and the second heating film in this embodiment can be arranged in a zigzag shape in the lower battery box. The specific structure can refer to Figure 2 , Figure 2 which is a schematic diagram of the heating film arrangement for the power battery heating method of this application. As can be seen from Figure 2 , one end of the heating film is connected to the total positive of the battery, and the other end is connected to the total negative of the battery.

[0054] In this embodiment, when a charging request for the power battery is received, the heating mode corresponding to the power battery is determined according to the cell temperature of the power battery; the first heating circuit and / or the second heating circuit are controlled according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the lower battery box for heating the power battery, and the power of the first heating film or the second heating film is less than the minimum charging gun power. The above method in this embodiment arranges the first heating film and the second heating film with powers less than the minimum charging gun power in the lower battery box, and flexibly configures the first heating circuit composed of the first heating film and the first heating relay in series and / or the second heating circuit composed of the second heating film and the second heating relay in series according to the charging gun power, thereby achieving the technical effect of being able to heat the power battery in compatibility with a low-power charging gun.

[0055] Refer to Figure 3 , Figure 3It is a schematic flowchart of the second embodiment of the power battery heating method of this application.

[0056] In a feasible implementation manner, the power battery heating system further includes a main negative relay, and the main negative relay is used to control the on-off of the negative electrode of the power battery. The step S20 may include:

[0057] Step S201: If the heating mode is the first heating mode, disconnect the main negative relay to cut off the charging circuit of the power battery.

[0058] It should be noted that the above first heating mode may be a pure heating mode, that is, a mode that only performs the operation of heating the power battery.

[0059] In a specific implementation, after determining that the heating mode is the first heating mode, a disconnection instruction can be sent from the BMS to the main negative relay, and the main negative relay controls the contact to disconnect through the electromagnetic coil, thereby cutting off the electrical connection between the negative electrode of the power battery and the charging device or the vehicle load.

[0060] Step S202: When the charging gun power is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to perform the first heating mode in the full power state on the power battery.

[0061] It should be noted that the above preset power can be flexibly set according to the actual use scenario, such as 5.7kW, 6.6kW, etc., and this embodiment does not limit this.

[0062] Step S203: When the charging gun power is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to perform the first heating mode in the half power state on the power battery.

[0063] It should be noted that in the slow charging heating process, the battery management system can real-time monitor the input power of the slow charging gun. When the slow charging gun power reaches or exceeds a certain threshold (such as 6.6kW), the system will control the two-way heating relay to close and enable all heating power; when the slow charging gun power is lower than this threshold, the system only closes one-way heating relay and enables partial heating power.

[0064] It should be understood that, taking a lithium-ion battery as an example, in a low-temperature environment, the solid electrolyte interface (SEI) film on the surface of the battery cathode may become unstable at low temperatures, resulting in a decrease in the efficiency of lithium-ion insertion and extraction. It may even cause the rupture and regeneration of the SEI film, consuming active lithium and reducing the battery capacity. Therefore, when the battery temperature is below a certain threshold (e.g., 0°C), the BMS will limit the charging current or completely prohibit charging to prevent battery damage. Based on this, when in a low-temperature environment, the above-mentioned first heating mode can be used to heat the power battery.

[0065] In a feasible implementation manner, the step S20 may further include:

[0066] Step S201’: If the heating mode is the second heating mode, then close the main negative relay to connect the charging circuit of the power battery.

[0067] It should be noted that the above-mentioned second heating mode can be a heating-while-charging mode, that is, a mode in which the charging operation is performed while the heating operation of the power battery is being carried out.

[0068] In a specific implementation, after determining that the heating mode is the second heating mode, a closing instruction can be sent to the main negative relay through the BMS. The main negative relay controls the closing of the contacts through an electromagnetic coil to achieve the electrical connection between the negative electrode of the power battery and the charging device or the vehicle load. During the charging process, the main negative relay is closed, making the negative electrode of the battery conduct with the negative electrode of the charging pile to form a complete charging circuit.

[0069] Step S202’: When the power of the charging gun is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to perform the second heating mode in a full-power state on the power battery.

[0070] Step S203’: When the power of the charging gun is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to perform the second heating mode in a half-power state on the power battery.

[0071] It should be understood that when the power battery is in a relatively low-temperature environment (e.g., an environment of 0 - 15°C) or the original low-temperature environment is converted into a relatively low-temperature environment through the above-mentioned first heating mode, even if the conditions for performing the charging operation on the power battery are met at this time, the charging efficiency is low. Therefore, in order to quickly meet the user's charging needs, the above-mentioned second heating mode can be used to heat the power battery to gradually improve the charging efficiency of the power battery and reduce the user's charging waiting time.

[0072] In this embodiment, if the heating mode is the first heating mode, the main negative relay is disconnected to cut off the charging circuit of the power battery; when the charging gun power is greater than or equal to the preset power, the first heating relay and the second heating relay are closed to control the first heating circuit and the second heating circuit to execute the first heating mode in the full-power state for the power battery; when the charging gun power is less than the preset power, the first heating relay or the second heating relay is closed to control the first heating circuit or the second heating circuit to execute the first heating mode in the half-power state for the power battery; if the heating mode is the second heating mode, the main negative relay is closed to connect the charging circuit of the power battery; when the charging gun power is greater than or equal to the preset power, the first heating relay and the second heating relay are closed to control the first heating circuit and the second heating circuit to execute the second heating mode in the full-power state for the power battery; when the charging gun power is less than the preset power, the first heating relay or the second heating relay is closed to control the first heating circuit or the second heating circuit to execute the second heating mode in the half-power state for the power battery. The above method in this embodiment cuts off the charging circuit of the power battery and pauses charging when the temperature is too low (such as below 0°C), and then flexibly configures the first heating film and / or the second heating film according to the charging gun power to execute the first heating mode in the full-power state or the half-power state for the power battery, thereby avoiding damage to the power battery; at the same time, when the temperature is relatively low (such as higher than 0°C and lower than 15°C), the charging circuit of the power battery is connected to start charging, and then the first heating film and / or the second heating film are flexibly configured according to the charging gun power to execute the first heating mode in the full-power state or the half-power state for the power battery, thereby improving the charging efficiency.

[0073] Reference Figure 4 , Figure 4 is a schematic flowchart of the third embodiment of the power battery heating method of the present application.

[0074] In a feasible implementation manner, the step S10 may include:

[0075] Step S101: If the core temperature of the power battery is less than the first preset temperature, it is determined that the heating mode corresponding to the power battery is the first heating mode.

[0076] Step S102: If the core temperature of the power battery is greater than or equal to the first preset temperature and less than the second preset temperature, it is determined that the heating mode corresponding to the power battery is the second heating mode.

[0077] It should be noted that the above first preset temperature can be the critical temperature at which charging operation of the power battery is prohibited, and the above second preset temperature can be the critical temperature at which the power battery reaches the full charging efficiency. Both can be flexibly set according to the specific parameters of the power battery. For example, it is known that a certain type of power battery cannot be charged below 0°C, can be charged but cannot reach the full charging efficiency in the temperature range of [0°C, 15°C), and can reach the full charging efficiency above 15°C. Then, for the power battery in this example, the above first preset temperature can be set to 0°C, and the above second preset temperature can be set to 15°C.

[0078] In a feasible implementation manner, the power battery heating system further includes a pre-charge relay and a main positive relay. The pre-charge relay is used to control the on / off of the pre-charge circuit of the power battery, and the main positive relay is used to control the on / off of the positive electrode of the power battery. After the step S10, the following steps may further be included:

[0079] Step S11: Close the main negative relay and the pre-charge relay to connect the pre-charge circuit of the power battery to perform capacitor pre-charging.

[0080] Step S12: After the pre-charging is completed, close the main positive relay and disconnect the pre-charge relay.

[0081] It should be understood that in the pre-charge stage, closing the main negative relay first can balance the voltage, and then closing the main positive relay to complete the establishment of the charging circuit.

[0082] In specific implementation, when a power source such as a capacitor or a battery in a circuit is connected, due to the existence of the internal resistance of the power source, the output voltage of the power source will gradually rise until it reaches a stable state. This process requires a certain amount of time, and during this period, other components in the circuit may be damaged. The pre-charge relay set in this embodiment can control the relay in the circuit, so that when a power source such as a capacitor or a battery is connected to the circuit, it first pre-charges through a resistor, makes the output voltage of the power source gradually rise to a stable state, and then closes the relay to make the power source work normally. In this way, other components in the circuit can be prevented from being damaged when the output voltage of the power source is unstable. Specifically, the above pre-charge resistor is a resistor with a relatively large rated current (usually several hundred milliamperes to several amperes), which is used to limit the charging current and ensure the normal operation of the power source. In the pre-charge stage, the pre-charge relay is closed, and together with the pre-charge resistor, it forms a pre-charge circuit, enabling the current to pass through the pre-charge resistor to charge the capacitor. When the capacitor voltage approaches the power source voltage, the pre-charge relay is disconnected, and at this time, the main positive relay is closed, and the circuit enters the normal working state.

[0083] In a feasible implementation manner, the power battery heating method may further include:

[0084] Step S30: If the core temperature of the power battery is greater than or equal to the second preset temperature, disconnect the first heating relay and the second heating relay to cut off the first heating circuit and the second heating circuit.

[0085] It should be understood that, referring to the description in the above step S102, when the core temperature of the power battery is greater than or equal to the second preset temperature, it can indicate that the power battery can be charged to the full charge efficiency at this time. Therefore, there is no need to heat the power battery at this time, and the first heating relay and the second heating relay can be disconnected to cut off the first heating circuit and the second heating circuit.

[0086] Further, for a more intuitive description of the power battery heating system in this embodiment and the above-mentioned embodiments, please refer to Figure 5 , Figure 5 which is a schematic diagram of the power battery heating system for the power battery heating method of the present application. In Figure 5 , the battery pack represents the above-mentioned power battery, the heating film 1 represents the above-mentioned first heating film, the heating relay 1 represents the above-mentioned first heating relay, the heating film 2 represents the above-mentioned second heating film, the heating relay 2 represents the above-mentioned second heating relay, the main fuse is used to protect the circuit safety of the main charge and discharge circuit, the heating fuse 1 is used to protect the circuit safety of the first heating circuit, the heating fuse 2 is used to protect the circuit safety of the second heating circuit, the pre-charge resistor is used for capacitor pre-charging, the current sensor is used to monitor the current in real time, the positive / negative of the discharge port is used to supply power to the vehicle, and the positive / negative of the charging port is used to charge the power battery.

[0087] In this embodiment, if the core temperature of the power battery is less than the first preset temperature, it is determined that the heating mode corresponding to the power battery is the first heating mode; if the core temperature of the power battery is greater than or equal to the first preset temperature and less than the second preset temperature, it is determined that the heating mode corresponding to the power battery is the second heating mode; the main negative relay and the precharge relay are closed to connect the precharge circuit of the power battery for capacitor precharge; after the precharge is completed, the main positive relay is closed and the precharge relay is disconnected; if the core temperature of the power battery is greater than or equal to the second preset temperature, the first heating relay and the second heating relay are disconnected to cut off the first heating circuit and the second heating circuit. The above method in this embodiment determines what heating mode to adopt to heat the power battery according to the core temperature of the power battery, thereby avoiding the significant limitation of the charge and discharge performance of the power battery in a low-temperature environment, and further avoiding affecting the vehicle's cruising range, acceleration performance and user experience; at the same time, a precharge circuit is set to avoid the current impact that the charging power supply may generate at the initial stage of charging and damage the electronic components in the charging circuit; in addition, since the core temperature of the power battery is greater than or equal to the second preset temperature does not belong to a low-temperature environment, cutting off the first heating circuit and the second heating circuit at this time can save energy consumption to improve the charging efficiency.

[0088] Refer to Figure 6 , Figure 6 FIG. is a structural block diagram of a first embodiment of a power battery heating device according to the present application. The device is applied to a power battery heating system. The power battery heating system at least includes a first heating circuit formed by a series connection of a first heating film and a first heating relay, and a second heating circuit formed by a series connection of a second heating film and a second heating relay. The first heating circuit and the second heating circuit are connected in parallel.

[0089] As Figure 6 shown, the power battery heating device proposed in the embodiment of the present application includes:

[0090] A mode judgment module 401, configured to determine the heating mode corresponding to the power battery according to the core temperature of the power battery when a charging request for the power battery is received;

[0091] A heating control module 402, configured to control the first heating film and / or the second heating film according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the battery lower box body to heat the power battery. The power of the first heating film or the second heating film is less than the minimum charging gun power.

[0092] When a charging request for the power battery is received in this embodiment, the heating mode corresponding to the power battery is determined according to the core temperature of the power battery; the first heating circuit and / or the second heating circuit are controlled according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the lower battery box to heat the power battery, and the power of the first heating film or the second heating film is less than the minimum charging gun power. The above method in this embodiment arranges the first heating film and the second heating film with power less than the minimum charging gun power in the lower battery box, and flexibly configures the first heating circuit composed of the first heating film and the first heating relay in series and / or the second heating circuit composed of the second heating film and the second heating relay in series according to the charging gun power, thereby achieving the technical effect of being able to be compatible with low-power charging guns to heat the power battery.

[0093] Based on the first embodiment of the above power battery heating device of the present application, a second embodiment of the power battery heating device of the present application is proposed.

[0094] In this embodiment, the power battery heating system further includes a main negative relay for controlling the on / off of the negative pole of the power battery. The heating control module 402 is further configured to, if the heating mode is the first heating mode, disconnect the main negative relay to cut off the charging circuit of the power battery; when the charging gun power is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to execute the first heating mode in the full-power state for the power battery; when the charging gun power is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to execute the first heating mode in the half-power state for the power battery.

[0095] Furthermore, the heating control module 402 is further configured to, if the heating mode is the second heating mode, close the main negative relay to connect the charging circuit of the power battery; when the charging gun power is greater than or equal to the preset power, close the first heating relay and the second heating relay to control the first heating circuit and the second heating circuit to execute the second heating mode in the full-power state for the power battery; when the charging gun power is less than the preset power, close the first heating relay or the second heating relay to control the first heating circuit or the second heating circuit to execute the second heating mode in the half-power state for the power battery.

[0096] Further, the mode determination module 401 is further configured to determine that the heating mode corresponding to the power battery is the first heating mode if the core temperature of the power battery is less than a first preset temperature; and determine that the heating mode corresponding to the power battery is the second heating mode if the core temperature of the power battery is greater than or equal to the first preset temperature and less than a second preset temperature.

[0097] Further, the power battery heating system further includes a pre-charge relay and a main positive relay. The pre-charge relay is configured to control the on / off of the pre-charge circuit of the power battery, and the main positive relay is configured to control the on / off of the positive electrode of the power battery. The heating control module 402 is further configured to close the main negative relay and the pre-charge relay to connect the pre-charge circuit of the power battery for capacitor pre-charging; after the pre-charging is completed, close the main positive relay and disconnect the pre-charge relay.

[0098] Further, the heating control module 402 is further configured to disconnect the first heating relay and the second heating relay to cut off the first heating circuit and the second heating circuit if the core temperature of the power battery is greater than or equal to the second preset temperature.

[0099] Other embodiments or specific implementation manners of the power battery heating device of the present application may refer to the above method embodiments, and will not be elaborated here.

[0100] The present application provides a power battery heating device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the power battery heating method in the first embodiment above.

[0101] Next, refer to Figure 7 , which shows a schematic structural diagram of a power battery heating device suitable for implementing the embodiments of the present application. The power battery heating device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The power battery heating device shown is only an example and should not impose any limitations on the functions and usage scopes of the embodiments of the present application.

[0102] AsFigure 7 As shown, the power battery heating device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which may perform various appropriate actions and processes according to the program stored in the read-only memory 1002 or the program loaded from the storage device 1003 into the random access memory 1004. In the random access memory 1004, various programs and data required for the operation of the power battery heating device are also stored. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are connected to each other through a bus 1005. The input / output interface 1006 is also connected to the bus. Generally, the following systems may be connected to the input / output interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the power battery heating device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a power battery heating device having various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or had alternatively.

[0103] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from the network through the communication device, or installed from the storage device 1003, or installed from the read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0104] The power battery heating device provided by the present application adopts the power battery heating method in the above embodiment, and can solve the technical problem that the existing power battery heating method cannot be compatible with a low-power charging gun. Compared with the prior art, the beneficial effects of the power battery heating device provided by the present application are the same as those of the power battery heating method provided by the above embodiment, and other technical features in the power battery heating device are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0105] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0106] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0107] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the power battery heating method in the above embodiments.

[0108] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in conjunction with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0109] The above computer-readable storage medium can be included in the power battery heating device; it can also exist separately without being assembled into the power battery heating device.

[0110] The above computer-readable storage medium carries one or more programs which, when executed by the power battery heating device, enable the power battery heating device to write computer program code for performing the operations of the present application in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++; and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, such as through a local area network (LAN) or a wide area network (WAN), or connected to an external computer (e.g., connected through the Internet using an Internet service provider).

[0111] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0112] The modules described in the embodiments of the present application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation to the unit itself in some cases.

[0113] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned power battery heating method, which can solve the technical problem that the existing power battery heating method cannot be compatible with low-power charging guns. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the power battery heating method provided by the above embodiment, and will not be elaborated here.

[0114] This application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, it realizes the steps of the power battery heating method as described above.

[0115] The computer program product provided by this application can solve the technical problem of power battery heating. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as those of the power battery heating method provided by the above embodiment, and will not be elaborated here.

[0116] The above are only partial embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made by using the content of the specification and drawings of this application under the technical concept of this application, or direct / indirect application in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A power battery heating method, characterized in that: The method is applied to a power battery heating system, the power battery heating system at least comprising a first heating circuit formed by a first heating film and a first heating relay connected in series, and a second heating circuit formed by a second heating film and a second heating relay connected in series, the first heating circuit and the second heating circuit being connected in parallel, the method comprising the following steps: When a charging request for a power battery is received, determining a heating mode corresponding to the power battery according to a cell temperature of the power battery; The first heating circuit and / or the second heating circuit are controlled according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the lower box of the battery for heating the power battery. The power of the first heating film or the second heating film is less than the minimum charging gun power.

2. The power battery heating method according to claim 1, characterized in that: The power battery heating system further includes a main negative relay, which is used to control the on and off of the negative electrode of the power battery. The step of controlling the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power includes: If the heating mode is the first heating mode, disconnecting the main negative relay to cut off the charging circuit of the power battery; When the charging gun power is greater than or equal to the preset power, the first heating relay and the second heating relay are closed to control the first heating circuit and the second heating circuit to perform the first heating mode at full power on the power battery; When the charging gun power is less than a preset power, the first heating relay or the second heating relay is closed to control the first heating circuit or the second heating circuit to perform the first heating mode in a half-power state on the power battery.

3. The power battery heating method according to claim 2, characterized in that: The step of controlling the first heating circuit and / or the second heating circuit according to the heating mode and the charging gun power also includes: If the heating mode is the second heating mode, closing the main negative relay to connect the charging circuit of the power battery; When the charging gun power is greater than or equal to the preset power, the first heating relay and the second heating relay are closed to control the first heating circuit and the second heating circuit to perform the second heating mode at full power state on the power battery; When the charging gun power is less than a preset power, the first heating relay or the second heating relay is closed to control the first heating circuit or the second heating circuit to perform the second heating mode in a half-power state on the power battery.

4. The power battery heating method according to claim 1, characterized in that: The step of determining a heating mode corresponding to the power battery according to the cell temperature of the power battery comprises: If the cell temperature of the power battery is lower than the first preset temperature, determining that the heating mode corresponding to the power battery is the first heating mode; If the cell temperature of the power battery is greater than or equal to the first preset temperature and less than the second preset temperature, it is determined that the heating mode corresponding to the power battery is the second heating mode.

5. The power battery heating method according to claim 2, characterized in that: The power battery heating system further includes a pre-charging relay and a main positive relay, wherein the pre-charging relay is used to control the on-off of the power battery pre-charging circuit, and the main positive relay is used to control the on-off of the positive electrode of the power battery. After the step of determining the heating mode corresponding to the power battery according to the cell temperature of the power battery, the system further includes: Closing the main negative relay and the pre-charging relay to connect the pre-charging circuit of the power battery to pre-charge the capacitor; After the pre-charging is completed, the main positive relay is closed and the pre-charging relay is opened.

6. The power battery heating method according to claim 1, characterized in that: The method further comprises: If the cell temperature of the power battery is greater than or equal to a second preset temperature, the first heating relay and the second heating relay are disconnected to cut off the first heating circuit and the second heating circuit.

7. A power battery heating device, characterized in that: The device is applied to a power battery heating system, the power battery heating system at least comprising a first heating circuit formed by a first heating film and a first heating relay connected in series, and a second heating circuit formed by a second heating film and a second heating relay connected in series, the first heating circuit and the second heating circuit being connected in parallel, the device comprising: A mode determination module, configured to determine a heating mode corresponding to the power battery according to a cell temperature of the power battery when a request for charging the power battery is received; A heating control module is used to control the first heating film and / or the second heating film according to the heating mode and the charging gun power. The first heating film and the second heating film are arranged in the lower box of the battery for heating the power battery. The power of the first heating film or the second heating film is less than the minimum charging gun power.

8. A power battery heating device, characterized in that: The device comprises: a memory, a processor, and a power battery heating program stored in the memory and executable on the processor, wherein the power battery heating program is configured to implement the steps of the power battery heating method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a power battery heating program is stored. When the power battery heating program is executed by a processor, the steps of the power battery heating method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a power battery heating program, and when the power battery heating program is executed by a processor, the steps of the power battery heating method according to any one of claims 1 to 6 are implemented.

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