Battery charging and discharging method, charging and discharging device, storage medium and charging and discharging system

Abstract

The present disclosure relates to a battery charging and discharging method, a battery charging and discharging device, a storage medium and a battery charging and discharging system. The battery charging and discharging method comprises: obtaining a current SOC state and a battery temperature of a battery during charging and discharging; determining whether the battery satisfies a charging and discharging condition of pulse rapid heating charging and discharging according to the current SOC state and the battery temperature of the battery; if the battery satisfies the charging and discharging condition of pulse rapid heating charging and discharging, obtaining a battery type of the battery and a charging and discharging mode of the battery; and determining a charging and discharging current for pulse rapid heating charging and discharging of the battery based on the current SOC state, the battery temperature, the battery type and the charging and discharging mode of the battery, so as to perform pulse rapid heating charging and discharging of the battery based on the charging and discharging current. The emergence of an excessively large pulse rapid heating charging and discharging current can be constrained through a plurality of condition restrictions, thereby facilitating reduction of the probability of emergence of an excessively large pulse current.

Description

Technical Field

[0001] This disclosure relates to the field of new energy vehicle technology, and in particular to a battery charging and discharging method, a battery charging and discharging device, a storage medium, and a battery charging and discharging system. Background Technology

[0002] In cold winter weather, the performance of electric vehicles deteriorates significantly, leading to problems such as limited power, range anxiety, slow charging, and even inability to charge. The root cause of these low-temperature issues is the limited charging and discharging performance of the battery at low temperatures.

[0003] To address these issues, pulse-speed heating (internal heating) technology has become a research hotspot for automakers in recent years. Pulse-speed heating is a form of internal battery heating, where the charge-discharge cycle current flowing through the battery generates heat across its internal resistance, raising the battery temperature. This fully utilizes the characteristic of increased internal resistance at low temperatures, with a higher heating rate at lower temperatures. Simultaneously, the high-frequency switching between charge and discharge currents can also prevent battery polarization, capacity degradation, lithium plating, and reduced cycle life.

[0004] However, excessive pulse current may affect the lifespan and safety of the battery cell, thereby affecting the effectiveness of pulse speed heating. Summary of the Invention

[0005] In view of the above, the present disclosure aims to provide a battery charging and discharging method, a battery charging and discharging device, a storage medium, and a battery charging and discharging system.

[0006] The technical solution disclosed herein is implemented as follows:

[0007] In a first aspect, this disclosure provides a battery charging and discharging method.

[0008] The battery charging and discharging method provided in this disclosure includes:

[0009] Obtain the current SOC state and battery temperature during battery charging and discharging;

[0010] Based on the current SOC state and battery temperature of the battery, determine whether the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging.

[0011] If the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging, then the battery type and the charging and discharging method of the battery are obtained.

[0012] Based on the current SOC state of the battery, the battery temperature, the battery type, and the battery charging and discharging mode, a charging and discharging current for pulse-speed heating and charging / discharging of the battery is determined, so as to perform pulse-speed heating and charging / discharging of the battery based on the charging and discharging current.

[0013] In some embodiments, determining the charge / discharge current for pulse-rate heating and charging / discharging the battery based on the battery's current SOC state, battery temperature, battery type, and charge / discharge mode includes:

[0014] Based on the charging and discharging method of the battery, the current pulse frequency for charging and discharging the battery is determined;

[0015] Based on the battery type and the current pulse frequency of the battery charging and discharging, determine the dynamic change of the battery internal resistance with the state of charge (SOC) or battery temperature when the battery is charged and discharged with the charging and discharging current corresponding to the current pulse frequency.

[0016] Based on the battery type, determine the selectable charging voltage for charging and discharging the battery;

[0017] Based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, the charging and discharging current for pulse-speed heating and charging / discharging of the battery under the current SOC state and battery temperature is determined; wherein, the battery internal resistance of the same battery is different under different SOC states or different battery temperatures under the same charging and discharging mode.

[0018] In some embodiments, the charging and discharging methods of the battery include charging pile charging and discharging methods and vehicle motor charging and discharging methods;

[0019] The determination of the dynamic change of the battery's internal resistance with respect to the state of charge (SOC) or battery temperature during charging and discharging using the charging and discharging current corresponding to the current pulse frequency, based on the current pulse frequency of the battery charging and discharging, includes:

[0020] If the current pulse frequency of the battery charging and discharging is the first current pulse frequency corresponding to the charging and discharging mode of the charging pile, then it is determined that when the battery is charged and discharged at the charging and discharging current corresponding to the first current pulse frequency, the change dynamic of the battery internal resistance with the SOC state or battery temperature is that the battery internal resistance has a negative logarithmic relationship with time.

[0021] If the current pulse frequency for charging and discharging the battery is the second current pulse frequency corresponding to the charging and discharging mode of the vehicle motor, then when the battery is charged and discharged at the charging and discharging current corresponding to the second current pulse frequency, the change dynamic of the battery internal resistance with the state of charge (SOC) or battery temperature is determined to be linear with time.

[0022] In some embodiments, determining the selectable charging voltage for charging and discharging the battery based on its battery type includes:

[0023] Based on the battery type, determine the boundary voltage and open-circuit voltage of the battery during charging and discharging; the boundary voltage is the upper or lower limit voltage at which the battery can be charged and discharged.

[0024] Based on the boundary voltage and the open-circuit voltage, the selectable charging voltage value for charging and discharging the battery is determined.

[0025] In some embodiments, determining whether the battery meets the charge / discharge conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature includes:

[0026] Obtain the SOC state range and temperature range of the battery that can be subjected to pulse-speed heating and charging / discharging.

[0027] If the current SOC state of the battery is within the SOC state range and the battery temperature is within the temperature range, then the battery is determined to meet the charging and discharging conditions of the pulse-speed heating and charging / discharging.

[0028] In some embodiments, before determining whether the battery meets the charge / discharge conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature, the method includes:

[0029] Obtain the historical SOC state value corresponding to the pulse-speed heating and charging of the battery when the user is charging and discharging the battery, and determine the SOC state range of the battery that can be pulse-speed heating and charging / discharging.

[0030] In some embodiments, determining the current SOC and the charging / discharging current for pulse-speed heating charging / discharging of the battery based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with varying SOC or battery temperature, includes:

[0031] During the charging process, the charging and discharging current of the battery is adjusted based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature.

[0032] Secondly, this disclosure provides a battery charging and discharging device, comprising:

[0033] The first information acquisition module is used to acquire the current SOC state and battery temperature when the battery is charging and discharging.

[0034] The information determination module is used to determine whether the battery meets the charging and discharging conditions of pulse-speed heating and charging based on the current SOC state and battery temperature of the battery.

[0035] The second information acquisition module is used to acquire the battery type and the charging and discharging method of the battery if the battery meets the charging and discharging conditions for pulse-speed heating and charging and discharging.

[0036] The charging and discharging module is used to determine the charging and discharging current for pulse-speed heating and charging / discharging of the battery based on the current SOC state of the battery, the battery temperature, the battery type, and the charging and discharging mode of the battery, so as to perform pulse-speed heating and charging / discharging of the battery based on the charging and discharging current.

[0037] Thirdly, this disclosure provides a computer-readable storage medium storing a battery charging and discharging program thereon, which, when executed by a processor, implements the battery charging and discharging method described in the first aspect above.

[0038] Fourthly, this disclosure provides a battery charging and discharging system, including a memory, a processor, and a battery charging and discharging program stored in the memory and executable on the processor. When the processor executes the battery charging and discharging program, it implements the battery charging and discharging method described in the first aspect above.

[0039] A battery charging and discharging method according to an embodiment of this disclosure includes acquiring the current SOC state and battery temperature of the battery during charging and discharging; determining whether the battery meets the charging and discharging conditions for pulse-speed heating and discharging based on the current SOC state and battery temperature; if the battery meets the charging and discharging conditions for pulse-speed heating and discharging, acquiring the battery type and battery charging and discharging mode; and determining the charging and discharging current for pulse-speed heating and discharging of the battery based on the current SOC state, battery temperature, battery type, and battery charging and discharging mode, so as to perform pulse-speed heating and discharging of the battery based on the charging and discharging current. In this application, when determining the charging and discharging current for pulse-speed heating and discharging of the battery, the current SOC state and battery temperature of the battery during charging and discharging are first acquired to determine whether the battery meets the charging and discharging conditions for pulse-speed heating and discharging. When the battery meets the charging and discharging conditions for pulse-speed heating and discharging, the charging and discharging current for pulse-speed heating and discharging of the battery is determined by combining the current SOC state, battery temperature, battery type, and battery charging and discharging mode. Since the appropriate charge and discharge current for pulse-speed heating and charging varies depending on the battery type, temperature, and charging / discharging method, excessive pulse-speed heating and charging current can be constrained through various limitations, thereby reducing the probability of excessive pulse current.

[0040] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0041] Figure 1 This is a flowchart illustrating a battery charging and discharging method according to an exemplary embodiment;

[0042] Figure 2 This is a flowchart illustrating a battery charging and discharging process according to an exemplary embodiment;

[0043] Figure 3 This is a schematic diagram of a battery charging and discharging device structure according to an exemplary embodiment. Detailed Implementation

[0044] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0045] In cold winter weather, the performance of electric vehicles deteriorates significantly, leading to problems such as limited power, range anxiety, slow charging, and even charging failure. The root cause of these low-temperature issues is the limited charging and discharging performance of the battery at low temperatures. To address these problems, pulse-speed heating (internal heating) technology has become a research hotspot for automakers in recent years. Pulse-speed heating is a form of internal battery heating, where the charge and discharge cycle current flowing through the battery generates heat across its internal resistance, raising the battery temperature. This fully utilizes the increased internal resistance of the battery at low temperatures, with a higher heating rate as the temperature decreases. Simultaneously, the high-frequency switching between charge and discharge currents can prevent battery polarization, capacity degradation, lithium plating, and reduced cycle life. However, excessively large pulse currents may affect the lifespan and safety of the battery cells, thus impacting the effectiveness of pulse-speed heating.

[0046] In view of the above situation, this disclosure provides a battery charging and discharging method. Figure 1 This is a flowchart illustrating a battery charging and discharging method according to an exemplary embodiment. Figure 1 As shown, the battery charging and discharging method includes:

[0047] Step 10: Obtain the current SOC state and battery temperature during charging and discharging;

[0048] Step 11: Based on the current SOC state and battery temperature of the battery, determine whether the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging.

[0049] Step 12: If the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging, then obtain the battery type and the charging and discharging method of the battery.

[0050] Step 13: Based on the current SOC state of the battery, the battery temperature, the battery type, and the charging and discharging mode of the battery, determine the charging and discharging current for pulse-speed heating and charging / discharging of the battery, so as to perform pulse-speed heating and charging / discharging of the battery based on the charging and discharging current.

[0051] In an exemplary embodiment, since excessively high battery temperature or SOC state can easily trigger large pulse rate currents, pulse rate heating and charging / discharging of the battery may not be initiated in unsuitable SOC or battery temperature ranges.

[0052] When the battery meets the charging and discharging conditions for pulse-speed heating and discharging, the charging and discharging current for pulse-speed heating and discharging is determined by considering the battery's current SOC, battery temperature, battery type, and charging and discharging method. Since the suitable charging and discharging current for pulse-speed heating and discharging varies depending on the battery type, temperature, and charging and discharging method, excessively large pulse-speed heating and discharging currents can be constrained through various limitations, thereby reducing the probability of excessive pulse currents.

[0053] In some embodiments, determining the charge / discharge current for pulse-rate heating and charging / discharging the battery based on the battery's current SOC state, battery temperature, battery type, and charge / discharge mode includes:

[0054] Based on the charging and discharging method of the battery, the current pulse frequency for charging and discharging the battery is determined;

[0055] Based on the battery type and the current pulse frequency of the battery charging and discharging, determine the dynamic change of the battery internal resistance with the state of charge (SOC) or battery temperature when the battery is charged and discharged with the charging and discharging current corresponding to the current pulse frequency.

[0056] Based on the battery type, determine the selectable charging voltage for charging and discharging the battery;

[0057] Based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, the charging and discharging current for pulse-speed heating and charging / discharging of the battery under the current SOC state and battery temperature is determined; wherein, the battery internal resistance of the same battery is different under different SOC states or different battery temperatures under the same charging and discharging mode.

[0058] In an exemplary embodiment, the charging and discharging current pulse frequency will differ depending on the charging and discharging method of the battery. For example, the charging and discharging methods include a charging pile charging and discharging method and a vehicle motor charging and discharging method. The current pulse frequency for battery charging and discharging is a first current pulse frequency corresponding to the charging pile charging and discharging method. The current pulse frequency for battery charging and discharging is a second current pulse frequency corresponding to the vehicle motor charging and discharging method. The first current pulse frequency and the second current pulse frequency are different. For example, the first current pulse frequency is 100Hz to 200Hz, and the second current pulse frequency is 900Hz to 1000Hz.

[0059] Based on the battery type and the current pulse frequency for charging and discharging, the dynamic changes in the battery's internal resistance with varying SOC and temperature are determined under the current pulse frequency and charging / discharging conditions. Then, based on the selectable charging voltage and the dynamic changes in the battery's internal resistance with varying SOC and temperature, the appropriate charging / discharging current for pulse-rate heating and discharging under the current SOC and temperature conditions is determined. This yields a suitable charging / discharging current for pulse-rate heating and discharging under the battery's current SOC and temperature conditions, thus reducing the probability of excessively large pulse currents.

[0060] In some embodiments, the charging and discharging methods of the battery include charging pile charging and discharging methods and vehicle motor charging and discharging methods;

[0061] The determination of the dynamic change of the battery's internal resistance with respect to the state of charge (SOC) or battery temperature during charging and discharging using the charging and discharging current corresponding to the current pulse frequency, based on the current pulse frequency of the battery charging and discharging, includes:

[0062] If the current pulse frequency of the battery charging and discharging is the first current pulse frequency corresponding to the charging and discharging mode of the charging pile, then it is determined that when the battery is charged and discharged at the charging and discharging current corresponding to the first current pulse frequency, the change dynamic of the battery internal resistance with the SOC state or battery temperature is that the battery internal resistance has a negative logarithmic relationship with time.

[0063] If the current pulse frequency for charging and discharging the battery is the second current pulse frequency corresponding to the charging and discharging mode of the vehicle motor, then when the battery is charged and discharged at the charging and discharging current corresponding to the second current pulse frequency, the change dynamic of the battery internal resistance with the state of charge (SOC) or battery temperature is determined to be linear with time.

[0064] In exemplary embodiments, the dynamic changes in battery internal resistance with SOC or battery temperature differ depending on the battery charging / discharging method. For example, if the current pulse frequency for battery charging / discharging is the first current pulse frequency corresponding to the charging pile charging / discharging method, then when the battery is charged / discharged with the charging / discharging current corresponding to the first current pulse frequency, the dynamic changes in battery internal resistance with SOC or battery temperature are determined to be a negative logarithmic relationship with time. If the current pulse frequency for battery charging / discharging is the second current pulse frequency corresponding to the vehicle motor charging / discharging method, then when the battery is charged / discharged with the charging / discharging current corresponding to the second current pulse frequency, the dynamic changes in battery internal resistance with SOC or battery temperature are determined to be a linear relationship with time. This facilitates adjusting the charging / discharging current for pulse-speed heating charging / discharging of the battery based on the dynamic changes in battery internal resistance with SOC or battery temperature.

[0065] In some embodiments, determining the selectable charging voltage for charging and discharging the battery based on its battery type includes:

[0066] Based on the battery type, determine the boundary voltage and open-circuit voltage of the battery during charging and discharging; the boundary voltage is the upper or lower limit voltage at which the battery can be charged and discharged.

[0067] Based on the boundary voltage and the open-circuit voltage, the selectable charging voltage value for charging and discharging the battery is determined.

[0068] In an exemplary embodiment, the charge / discharge current for pulse-rate heating and charging / discharging the battery is I2; where I2 = (V 上限 -Vocv) / R2, or I2=(Vocv-V 下限 ) / R2; where,

[0069] V 上限 The upper limit voltage of the cell within the full voltage window at that temperature, V 下限 R1 is the lower limit voltage of the cell within the full voltage window at that temperature, Vocv is the open circuit voltage, and R2 is the internal resistance of the battery at the selected pulse current frequency.

[0070] In some embodiments, determining whether the battery meets the charge / discharge conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature includes:

[0071] Obtain the SOC state range and temperature range of the battery that can be subjected to pulse-speed heating and charging / discharging.

[0072] If the current SOC state of the battery is within the SOC state range and the battery temperature is within the temperature range, then the battery is determined to meet the charging and discharging conditions of the pulse-speed heating and charging / discharging.

[0073] In an exemplary embodiment, for example, the state of charge (SOC) range for pulse-speed heating and discharging is 10% to 50%, and the temperature range for pulse-speed heating and discharging is -30°C to 35°C. When the current SOC of the battery is within 10% to 50% and the battery temperature is within -30°C to 35°C, it is determined that the battery meets the charging and discharging conditions for pulse-speed heating and discharging.

[0074] In some embodiments, before determining whether the battery meets the charge / discharge conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature, the method includes:

[0075] Obtain the historical SOC state value corresponding to the pulse-speed heating and charging of the battery when the user is charging and discharging the battery, and determine the SOC state range of the battery that can be pulse-speed heating and charging / discharging.

[0076] In an exemplary embodiment, the SOC state range can be determined by referring to historical SOC values ​​corresponding to pulse-speed heating charging during battery charging and discharging by the user, thus defining the SOC state range suitable for pulse-speed heating charging and discharging. For example, the SOC state range suitable for pulse-speed heating charging and discharging can be defined as 10% to 50%.

[0077] In an exemplary embodiment, determining the current state of charge / discharge (SOC) of the battery and the charging / discharging current for pulse-speed heating under the battery temperature conditions, based on the selectable charging voltage during battery charging and discharging and the dynamic change of the battery's internal resistance with varying SOC or battery temperature, includes:

[0078] Based on the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature, the resistance of the battery at the current time is determined.

[0079] The selectable charging voltage during battery charging and discharging, and the resistance of the battery at the current time, determine the charging and discharging current for pulse-speed heating and charging / discharging of the battery at the current time.

[0080] In some embodiments, determining the current SOC and the charging / discharging current for pulse-speed heating charging / discharging of the battery based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with varying SOC or battery temperature, includes:

[0081] During the charging process, the charging and discharging current of the battery is adjusted based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature.

[0082] In an exemplary embodiment, the battery's internal resistance changes with variations in battery SOC and temperature. Therefore, during charging, to reduce the probability of excessively high pulse-rate heating charge / discharge current, the charging / discharge current for pulse-rate heating charge / discharge needs to be adjusted. This can be achieved by adjusting the battery's charging / discharging voltage. Specifically, if the battery's SOC is outside its SOC range or its temperature is outside its temperature range during charging, the pulse-rate heating charge / discharge process ends, and the system returns to normal charging mode.

[0083] Figure 2 This is a flowchart illustrating a battery charging and discharging process according to an exemplary embodiment. Figure 2 As shown, the battery charging and discharging process includes:

[0084] Step 20: Obtain the current power battery temperature and display SOC;

[0085] Step 21: Determine whether the SOC is within 10% to 50% and whether the cell temperature is greater than -30℃;

[0086] Step 22: If the SOC is not within 10% to 50%, or the cell temperature is less than -30℃, then end the battery pulse speed heating and discharging.

[0087] Step 23: If the SOC is between 10% and 50% and the cell temperature is greater than -30℃, then find the cell rapid heating map based on the SOC value to obtain the current value at different temperatures.

[0088] Step 24: During the charging process, check if the cell temperature is greater than 10℃. If not, continue charging.

[0089] Step 25: If the cell temperature is greater than 10°C, then the battery is charged and discharged using pulse speed heating.

[0090] Figure 3 This is a schematic diagram of a battery charging and discharging device structure according to an exemplary embodiment. Figure 3 As shown, the battery charging and discharging device includes:

[0091] The first information acquisition module 30 is used to acquire the current SOC state and battery temperature when the battery is charging and discharging.

[0092] The information determination module 31 is used to determine whether the battery meets the charging and discharging conditions of pulse-speed heating and charging based on the current SOC state and battery temperature of the battery.

[0093] The second information acquisition module 32 is used to acquire the battery type and the charging and discharging method of the battery if the battery meets the charging and discharging conditions for pulse-speed heating and charging and discharging.

[0094] The charging and discharging module 33 is used to determine the charging and discharging current for pulse-speed heating and charging / discharging of the battery based on the current SOC state of the battery, the battery temperature, the battery type and the charging and discharging mode of the battery, so as to perform pulse-speed heating and charging / discharging of the battery based on the charging and discharging current.

[0095] In an exemplary embodiment, since excessively high battery temperature or SOC state can easily trigger large pulse rate currents, pulse rate heating and charging / discharging of the battery may not be initiated in unsuitable SOC or battery temperature ranges.

[0096] When the battery meets the charging and discharging conditions for pulse-speed heating and discharging, the charging and discharging current for pulse-speed heating and discharging is determined by considering the battery's current SOC, battery temperature, battery type, and charging and discharging method. Since the suitable charging and discharging current for pulse-speed heating and discharging varies depending on the battery type, temperature, and charging and discharging method, excessively large pulse-speed heating and discharging currents can be constrained through various limitations, thereby reducing the probability of excessive pulse currents.

[0097] In some embodiments, the charge / discharge module 33 is used for

[0098] Based on the charging and discharging method of the battery, the current pulse frequency for charging and discharging the battery is determined;

[0099] Based on the battery type and the current pulse frequency of the battery charging and discharging, determine the dynamic change of the battery internal resistance with the state of charge (SOC) or battery temperature when the battery is charged and discharged with the charging and discharging current corresponding to the current pulse frequency.

[0100] Based on the battery type, determine the selectable charging voltage for charging and discharging the battery;

[0101] Based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, the charging and discharging current for pulse-speed heating and charging / discharging of the battery under the current SOC state and battery temperature is determined; wherein, the battery internal resistance of the same battery is different under different SOC states or different battery temperatures under the same charging and discharging mode.

[0102] In an exemplary embodiment, the charging and discharging current pulse frequency will differ depending on the charging and discharging method of the battery. For example, the charging and discharging methods include a charging pile charging and discharging method and a vehicle motor charging and discharging method. The current pulse frequency for battery charging and discharging is a first current pulse frequency corresponding to the charging pile charging and discharging method. The current pulse frequency for battery charging and discharging is a second current pulse frequency corresponding to the vehicle motor charging and discharging method. The first current pulse frequency and the second current pulse frequency are different. For example, the first current pulse frequency is 100Hz to 200Hz, and the second current pulse frequency is 900Hz to 1000Hz.

[0103] Based on the battery type and the current pulse frequency for charging and discharging, the dynamic changes in the battery's internal resistance with varying SOC and temperature are determined under the current pulse frequency and charging / discharging conditions. Then, based on the selectable charging voltage and the dynamic changes in the battery's internal resistance with varying SOC and temperature, the appropriate charging / discharging current for pulse-rate heating and discharging under the current SOC and temperature conditions is determined. This yields a suitable charging / discharging current for pulse-rate heating and discharging under the battery's current SOC and temperature conditions, thus reducing the probability of excessively large pulse currents.

[0104] In some embodiments, the charging and discharging methods of the battery include charging pile charging and discharging methods and vehicle motor charging and discharging methods;

[0105] The charging and discharging module 33 is used for

[0106] If the current pulse frequency of the battery charging and discharging is the first current pulse frequency corresponding to the charging and discharging mode of the charging pile, then it is determined that when the battery is charged and discharged at the charging and discharging current corresponding to the first current pulse frequency, the change dynamic of the battery internal resistance with the SOC state or battery temperature is that the battery internal resistance has a negative logarithmic relationship with time.

[0107] If the current pulse frequency for charging and discharging the battery is the second current pulse frequency corresponding to the charging and discharging mode of the vehicle motor, then when the battery is charged and discharged at the charging and discharging current corresponding to the second current pulse frequency, the change dynamic of the battery internal resistance with the state of charge (SOC) or battery temperature is determined to be linear with time.

[0108] In exemplary embodiments, the dynamic changes in battery internal resistance with SOC or battery temperature differ depending on the battery charging / discharging method. For example, if the current pulse frequency for battery charging / discharging is the first current pulse frequency corresponding to the charging pile charging / discharging method, then when the battery is charged / discharged with the charging / discharging current corresponding to the first current pulse frequency, the dynamic changes in battery internal resistance with SOC or battery temperature are determined to be a negative logarithmic relationship with time. If the current pulse frequency for battery charging / discharging is the second current pulse frequency corresponding to the vehicle motor charging / discharging method, then when the battery is charged / discharged with the charging / discharging current corresponding to the second current pulse frequency, the dynamic changes in battery internal resistance with SOC or battery temperature are determined to be a linear relationship with time. This facilitates adjusting the charging / discharging current for pulse-speed heating charging / discharging of the battery based on the dynamic changes in battery internal resistance with SOC or battery temperature.

[0109] In some embodiments, the charge / discharge module 33 is used for

[0110] Based on the battery type, determine the boundary voltage and open-circuit voltage of the battery during charging and discharging; the boundary voltage is the upper or lower limit voltage at which the battery can be charged and discharged.

[0111] Based on the boundary voltage and the open-circuit voltage, the selectable charging voltage value for charging and discharging the battery is determined.

[0112] In an exemplary embodiment, the charge / discharge current for pulse-rate heating and charging / discharging the battery is I2; where I2 = (V 上限 -Vocv) / R2, or I2=(Vocv-V 下限 ) / R2; where,

[0113] V 上限 The upper limit voltage of the cell within the full voltage window at that temperature, V 下限 R1 is the lower limit voltage of the cell within the full voltage window at that temperature, Vocv is the open circuit voltage, and R2 is the internal resistance of the battery at the selected pulse current frequency.

[0114] In some embodiments, the information determination module 31 is used for

[0115] Obtain the SOC state range and temperature range of the battery that can be subjected to pulse-speed heating and charging / discharging.

[0116] If the current SOC state of the battery is within the SOC state range and the battery temperature is within the temperature range, then the battery is determined to meet the charging and discharging conditions of the pulse-speed heating and charging / discharging.

[0117] In an exemplary embodiment, for example, the state of charge (SOC) range for pulse-speed heating and discharging is 10% to 50%, and the temperature range for pulse-speed heating and discharging is -30°C to 35°C. When the current SOC of the battery is within 10% to 50% and the battery temperature is within -30°C to 35°C, it is determined that the battery meets the charging and discharging conditions for pulse-speed heating and discharging.

[0118] In some embodiments, before determining whether the battery meets the charging and discharging conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature, the first information acquisition module 30 is used to...

[0119] Obtain the historical SOC state value corresponding to the pulse-speed heating and charging of the battery when the user is charging and discharging the battery, and determine the SOC state range of the battery that can be pulse-speed heating and charging / discharging.

[0120] In an exemplary embodiment, the SOC state range can be determined by referring to historical SOC values ​​corresponding to pulse-speed heating charging during battery charging and discharging by the user, thus defining the SOC state range suitable for pulse-speed heating charging and discharging. For example, the SOC state range suitable for pulse-speed heating charging and discharging can be defined as 10% to 50%.

[0121] In an exemplary embodiment, the charging and discharging module 33 is used for

[0122] Based on the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature, the resistance of the battery at the current time is determined.

[0123] The selectable charging voltage during battery charging and discharging, and the resistance of the battery at the current time, determine the charging and discharging current for pulse-speed heating and charging / discharging of the battery at the current time.

[0124] In some embodiments, the charge / discharge module 33 is used for

[0125] During the charging process, the charging and discharging current of the battery is adjusted based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature.

[0126] In an exemplary embodiment, the battery's internal resistance changes with variations in battery state of charge (SOC) and battery temperature. Therefore, during charging, to reduce the probability of excessively high pulse-rate heating charge / discharge current, the charge / discharge current for pulse-rate heating charge / discharge needs to be adjusted. This can be achieved by adjusting the battery's charge / discharge voltage.

[0127] This disclosure provides a computer-readable storage medium storing a battery charging and discharging program thereon, which, when executed by a processor, implements the battery charging and discharging methods described in the above embodiments.

[0128] This disclosure provides a battery charging and discharging system, including a memory, a processor, and a battery charging and discharging program stored in the memory and executable on the processor. When the processor executes the battery charging and discharging program, it implements the battery charging and discharging methods described in the above embodiments.

[0129] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0130] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0131] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0132] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0133] Furthermore, the terms "first," "second," etc., used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this disclosure can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this disclosure, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0134] In this disclosure, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing," etc., appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific implementation.

[0135] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0136] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A battery charging and discharging method, characterized in that, include: Obtain the current SOC state and battery temperature during battery charging and discharging; Based on the current SOC state and battery temperature of the battery, determine whether the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging. If the battery meets the charging and discharging conditions for pulse-speed heating and charging / discharging, then the battery type and the charging and discharging method of the battery are obtained. Based on the current SOC state of the battery, the battery temperature, the battery type, and the battery charging and discharging method, a charging and discharging current for pulse-speed heating and charging / discharging of the battery is determined, so as to perform pulse-speed heating and charging / discharging of the battery based on the charging and discharging current. The step of determining the charge / discharge current for pulse-speed heating and charging / discharging the battery based on the battery's current SOC state, battery temperature, battery type, and charging / discharging mode includes: Based on the charging and discharging method of the battery, the current pulse frequency for charging and discharging the battery is determined; Based on the battery type and the current pulse frequency of the battery charging and discharging, determine the dynamic change of the battery internal resistance with the state of charge (SOC) or battery temperature when the battery is charged and discharged with the charging and discharging current corresponding to the current pulse frequency. Based on the battery type, determine the selectable charging voltage for charging and discharging the battery; Based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, the charging and discharging current for pulse-speed heating and charging / discharging of the battery under the current SOC state and battery temperature is determined; wherein, the battery internal resistance of the same battery is different under different SOC states or different battery temperatures under the same charging and discharging mode.

2. The battery charging and discharging method according to claim 1, characterized in that, The battery charging and discharging methods include charging pile charging and discharging methods and vehicle motor charging and discharging methods. The determination of the dynamic change of the battery's internal resistance with respect to the state of charge (SOC) or battery temperature during charging and discharging using the charging and discharging current corresponding to the current pulse frequency, based on the current pulse frequency of the battery charging and discharging, includes: If the current pulse frequency of the battery charging and discharging is the first current pulse frequency corresponding to the charging and discharging mode of the charging pile, then it is determined that when the battery is charged and discharged at the charging and discharging current corresponding to the first current pulse frequency, the change dynamic of the battery internal resistance with the SOC state or battery temperature is that the battery internal resistance has a negative logarithmic relationship with time. If the current pulse frequency for charging and discharging the battery is the second current pulse frequency corresponding to the charging and discharging mode of the vehicle motor, then when the battery is charged and discharged at the charging and discharging current corresponding to the second current pulse frequency, the change dynamic of the battery internal resistance with the state of charge (SOC) or battery temperature is determined to be linear with time.

3. The battery charging and discharging method according to claim 1, characterized in that, Determining the selectable charging voltage for charging and discharging the battery based on its battery type includes: Based on the battery type, determine the boundary voltage and open-circuit voltage of the battery during charging and discharging; the boundary voltage is the upper or lower limit voltage at which the battery can be charged and discharged. Based on the boundary voltage and the open-circuit voltage, the selectable charging voltage value for charging and discharging the battery is determined.

4. The battery charging and discharging method according to claim 1, characterized in that, The step of determining whether the battery meets the charging and discharging conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature includes: Obtain the SOC state range and temperature range of the battery that can be subjected to pulse-speed heating and charging / discharging. If the current SOC state of the battery is within the SOC state range and the battery temperature is within the temperature range, then the battery is determined to meet the charging and discharging conditions of the pulse-speed heating and charging / discharging.

5. The battery charging and discharging method according to claim 4, characterized in that, Before determining whether the battery meets the charging and discharging conditions for pulse-speed heating and discharging based on the battery's current SOC state and battery temperature, the method includes: Obtain the historical SOC state value corresponding to the pulse-speed heating and charging of the battery when the user is charging and discharging the battery, and determine the SOC state range of the battery that can be pulse-speed heating and charging / discharging.

6. The battery charging and discharging method according to claim 1 or 2, characterized in that, The determination of the charging / discharging current for pulse-speed heating and charging / discharging of the battery based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, includes: During the charging process, based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with the state of charge (SOC) or battery temperature, the charging and discharging current of the battery during pulse-speed heating and charging and discharging is adjusted under the current SOC state and battery temperature.

7. A battery charging and discharging device, characterized in that, include: The first information acquisition module is used to acquire the current SOC state and battery temperature when the battery is charging and discharging. The information determination module is used to determine whether the battery meets the charging and discharging conditions of pulse-speed heating and charging based on the current SOC state and battery temperature of the battery. The second information acquisition module is used to acquire the battery type and the charging and discharging method of the battery if the battery meets the charging and discharging conditions for pulse-speed heating and charging and discharging. The charging and discharging module is used to determine the charging and discharging current for pulse-speed heating and charging / discharging the battery based on the current SOC state of the battery, the battery temperature, the battery type and the charging and discharging mode of the battery, so as to perform pulse-speed heating and charging / discharging on the battery based on the charging and discharging current. The step of determining the charge / discharge current for pulse-speed heating and charging / discharging the battery based on the battery's current SOC state, battery temperature, battery type, and charging / discharging mode includes: Based on the charging and discharging method of the battery, the current pulse frequency for charging and discharging the battery is determined; Based on the battery type and the current pulse frequency of the battery charging and discharging, determine the dynamic change of the battery internal resistance with the state of charge (SOC) or battery temperature when the battery is charged and discharged with the charging and discharging current corresponding to the current pulse frequency. Based on the battery type, determine the selectable charging voltage for charging and discharging the battery; Based on the selectable charging voltage during battery charging and discharging, and the dynamic change of the battery's internal resistance with changes in SOC state or battery temperature, the charging and discharging current for pulse-speed heating and charging / discharging of the battery under the current SOC state and battery temperature is determined; wherein, the battery internal resistance of the same battery is different under different SOC states or different battery temperatures under the same charging and discharging mode.

8. A computer-readable storage medium, characterized in that, It stores a battery charging and discharging program, which, when executed by a processor, implements the battery charging and discharging method according to any one of claims 1-6.

9. A battery charging and discharging system, characterized in that, The device includes a memory, a processor, and a battery charging / discharging program stored in the memory and executable on the processor. When the processor executes the battery charging / discharging program, it implements the battery charging / discharging method according to any one of claims 1-6.

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