Power battery charging method, medium, equipment and vehicle

Abstract

The invention relates to a power battery charging method, a medium, equipment and a vehicle. The method comprises the following steps: under the condition that the power battery is subjected to direct-current charging by at least two direct-current charging loops at the same time, determining the maximum allowable charging current of the power battery and the current maximum allowable charging current of the power battery; and determining a current distribution strategy of the at least two direct current charging loops according to the maximum allowable charging current of the power battery and the current maximum allowable charging current of the power battery. The current distribution strategy of the at least two direct current charging loops corresponds to the maximum allowable charging current of the power battery, so that the current distribution of the at least two direct current charging loops is more reasonable.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle charging control, and in particular, to a power battery charging method, medium, device, and vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the market share of electric vehicles has increased year by year, and range anxiety is a common problem for new energy vehicles. Some electric vehicles are equipped with dual-gun DC charging circuits to solve the problem of insufficient output voltage and power of DC charging equipment. Since the two charging circuits of dual-gun charging can be controlled independently, how to reasonably distribute the current has become an urgent problem to be solved for dual-gun DC charging vehicles. Summary of the invention

[0003] The purpose of the present disclosure is to provide a power battery charging method, medium, device, and vehicle, which can reasonably distribute the current of a dual-gun DC charging circuit.

[0004] In order to achieve the above object, the present disclosure provides a power battery charging method, the method comprising:

[0005] When the power battery is DC charged by at least two DC charging circuits at the same time, determining a current maximum allowable charging current of the power battery;

[0006] A current distribution strategy for the at least two DC charging circuits is determined according to the current maximum allowable charging current of the power battery.

[0007] Optionally, determining the current distribution strategy of the at least two DC charging circuits according to the current maximum allowable charging current of the power battery includes:

[0008] The current distribution strategy of the at least two DC charging circuits is determined according to a comparison result between the current maximum allowable charging current of the power battery and the current threshold.

[0009] Optionally, when the power battery is simultaneously DC charged by two DC charging circuits, the two DC charging circuits include a first DC charging circuit and a second DC charging circuit, the first DC charging circuit is a boost charging circuit, and the second DC charging circuit is a direct charging circuit.

[0010] Optionally, the determining the current distribution strategy of the at least two DC charging circuits according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold value includes:

[0011] When the current maximum allowable charging current of the power battery is less than or equal to the first current threshold, the target current in the second DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the first DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the second DC charging circuit and the DC side output current of the on-board charger;

[0012] When the current maximum allowable charging current of the power battery is greater than the first current threshold, the target current in the second DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the first reserved value, and the smaller value of the following two is determined as the target current in the first DC charging circuit:

[0013] The maximum allowable current of the buck-boost module in the first DC charging circuit; and

[0014] The difference between the current maximum allowable charging current of the power battery, the current current in the second DC charging circuit, and the DC side output current of the on-board charger.

[0015] Optionally, the method further comprises:

[0016] When the power battery is DC charged only by the first DC charging circuit, the smaller value of the following two is determined as the target current in the first DC charging circuit:

[0017] The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and

[0018] the maximum allowable current of the buck-boost module in the first DC charging circuit;

[0019] When the power battery is DC charged only by the second DC charging circuit, the target current in the second DC charging circuit is determined as: the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger.

[0020] Optionally, the method further comprises:

[0021] If it is determined that the power battery has reached a high charge level, and if it is determined that the maximum output current of the charging pile connected to the second DC charging circuit can meet the current charging of the power battery, the charging of the first DC charging circuit is terminated.

[0022] Optionally, the at least two DC charging circuits include a third DC charging circuit and a fourth DC charging circuit, and the third DC charging circuit and the fourth DC charging circuit are both direct charging circuits.

[0023] Optionally, the determining the current distribution strategy of the at least two DC charging circuits according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold value includes:

[0024] When the current maximum allowable charging current of the power battery is less than or equal to the second current threshold, the target current in the fourth DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the third DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the fourth DC charging circuit and the DC side output current of the on-board charger;

[0025] When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the fourth DC charging circuit:

[0026] The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the second reserved value; and

[0027] The maximum charging current in the fourth DC charging circuit;

[0028] When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the third DC charging circuit:

[0029] The difference between the current maximum allowable charging current of the power battery, the current current in the fourth DC charging circuit, and the DC side output current of the on-board charger; and

[0030] The maximum charging current in the third DC charging circuit.

[0031] Optionally, the method further comprises:

[0032] When the power battery is DC charged only by the third DC charging circuit, the smaller value of the following two is determined as the target current in the third DC charging circuit:

[0033] The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and

[0034] The maximum charging current of the third DC charging circuit.

[0035] Optionally, the method further comprises:

[0036] If it is determined that the power battery has reached a high charge level, and if it is determined that the maximum output current of the charging pile connected to the fourth DC charging circuit can meet the current charging of the power battery, the charging of the third DC charging circuit is terminated.

[0037] The present disclosure also provides a non-temporary computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method provided by the present disclosure when the program is executed by a processor.

[0038] The present disclosure also provides an electronic device, comprising:

[0039] a memory having a computer program stored thereon;

[0040] A processor is used to execute the computer program in the memory to implement the steps of the above method provided by the present disclosure.

[0041] The present disclosure also provides a vehicle, comprising a power battery and the above-mentioned electronic device provided by the present disclosure.

[0042] Through the above technical solution, when the power battery is DC charged by at least two DC charging circuits at the same time, the current distribution strategy of at least two DC charging circuits is determined according to the current maximum allowable charging current of the power battery. Since the maximum allowable charging current of the power battery is related to the voltage of the single cell, the temperature of the power battery and the remaining power of the power battery, which reflects the current charging state of the power battery, the current distribution strategy of at least two DC charging circuits corresponds to the maximum allowable charging current of the power battery, so that the current distribution of the at least two DC charging circuits is more reasonable.

[0043] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0045] Figure 1 It is a flow chart of a power battery charging method provided by an exemplary embodiment.

[0046] Figure 2 is a schematic diagram of two DC charging circuits provided by an exemplary embodiment.

[0047] Figure 3 yes Figure 2Schematic diagram of two DC charging circuits and one AC charging circuit.

[0048] Figure 4 is a schematic diagram of two DC charging circuits provided by another exemplary embodiment.

[0049] Figure 5 yes Figure 4 Schematic diagram of two DC charging circuits and one AC charging circuit. DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] Figure 1 FIG. 1 is a flow chart of a power battery charging method provided by an exemplary embodiment. Figure 1 As shown, the method may include the following steps:

[0052] Step S101 : when the power battery is DC charged by at least two DC charging circuits at the same time, determining the current maximum allowable charging current of the power battery.

[0053] Step S102: determining a current distribution strategy for at least two DC charging circuits according to the current maximum allowable charging current of the power battery.

[0054] The maximum allowable charging current of the power battery indicates the maximum value of the current allowed to flow into the power battery when charging, which is related to the voltage of the single cell, the temperature of the power battery, and the remaining power of the power battery. During the charging process of the power battery, since the voltage of the single cell, the temperature of the power battery, and the remaining power of the power battery will change, the maximum allowable charging current of the power battery also changes in real time. For example, by looking up a table, the current corresponding to the current voltage of the single cell, the current temperature of the power battery, and the current remaining power of the power battery can be found in the corresponding relationship as the current maximum allowable charging current of the power battery. The current maximum allowable charging current of the power battery can be determined periodically.

[0055] Since the power battery is DC charged by at least two DC charging circuits at the same time, the current flowing into the power battery is the sum of the currents of these DC charging circuits. The current distribution strategy of at least two DC charging circuits includes how to determine the current of each DC charging circuit.

[0056] For example, the current distribution strategy of at least two DC charging circuits can be determined according to the current interval of the current maximum allowable charging current of the power battery. Multiple current intervals can be set in advance, and each current interval corresponds to a different current distribution strategy.

[0057] Since the maximum allowable charging current of the power battery is related to the voltage of the single cell, the power battery temperature and the remaining power of the power battery, it reflects the current charging state of the power battery. Therefore, the current distribution strategy of at least two DC charging circuits corresponds to the maximum allowable charging current of the power battery, making the current distribution of at least two DC charging circuits more reasonable.

[0058] In another embodiment, the current distribution strategy of at least two DC charging circuits is determined according to the current maximum allowable charging current of the power battery, including: determining the current distribution strategy of at least two DC charging circuits according to the comparison result of the current maximum allowable charging current of the power battery and the current threshold.

[0059] There are two types of current distribution strategies, corresponding to the two situations where the size comparison results are less than or equal to and greater than. That is, when the current maximum allowable charging current of the power battery is less than or equal to the current threshold, one current distribution strategy is adopted, and when the current maximum allowable charging current of the power battery is greater than the current threshold, another current distribution strategy is adopted. The current threshold can be set according to experiments or experience, so that when the current maximum allowable charging current of the power battery is greater than and less than the current threshold, there is a more obvious difference in the charging state, so that the corresponding current distribution strategies are respectively applicable.

[0060] In this embodiment, the corresponding current distribution strategy is determined by simply comparing the current maximum allowable charging current of the power battery with the current threshold value. The implementation method is simple and the processing speed is fast.

[0061] In another embodiment, when the power battery is DC charged by two DC charging circuits at the same time, the two DC charging circuits may include a first DC charging circuit and a second DC charging circuit. The first DC charging circuit is a boost charging circuit, and the second DC charging circuit is a direct charging circuit.

[0062] Figure 2 FIG. 1 is a schematic diagram of two DC charging circuits provided by an exemplary embodiment. Figure 2 As shown, the first DC charging circuit is provided with a first DC charging port, a first switch K1, a second switch K2 and a buck-boost module. The first DC charging port is connected to the power battery through the first switch K1, the second switch K2 and the buck-boost module in sequence. The second DC charging circuit is provided with a second DC charging port, a third switch K3 and a fourth switch K4. The second DC charging port is connected to the power battery through the third switch K3 and the fourth switch K4.

[0063] like Figure 2As shown, the controller is respectively connected to the first DC charging port, the first switch K1, the second switch K2, the second DC charging port, the third switch K3 and the fourth switch K4 (dashed line connection). The controller can be a vehicle-mounted controller with integrated DC charging function, and can include one or more vehicle-mounted controllers. The controller can include two sets of independent DC charging control guidance circuits, which interact with the charging pile through the charging subnet to perform CAN signal interaction to control the various stages of DC charging and the DC charging switches (for example, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4) in the DC charging circuit. The controller can be, for example, a power battery manager (Battery Management System, BMS). If it is other vehicle-mounted controllers, it can interact with the power battery manager through signals, such as DC charging gun connection signals, DC charging permission signals, maximum allowable charging current, etc. The power battery manager can monitor the cell status of the power battery (such as single cell voltage, temperature, maximum allowable charging current, etc.) during DC charging and perform charging state (State Of Charge, SOC) calculation. The controller can also interact with the buck-boost module through signals, such as the buck-boost module working command, the buck-boost module target voltage and current values, etc. After receiving the working command and the working target voltage and current values, the buck-boost module controls the output of the corresponding voltage and current values ​​and feeds back its own status.

[0064] In addition to DC charging, electric vehicles can also have AC charging capabilities. Figure 3 yes Figure 2 Schematic diagram of two DC charging circuits and one AC charging circuit. Figure 3 As shown, the AC charging port is connected to the power battery through the on-board charger. AC charging and the first DC circuit and the second DC circuit charging can be carried out in parallel.

[0065] In yet another embodiment, according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold, the current distribution strategy of at least two DC charging circuits is determined, including:

[0066] When the current maximum allowable charging current of the power battery is less than or equal to the first current threshold, the target current in the second DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the first DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the second DC charging circuit and the DC side output current of the on-board charger.

[0067] The above-mentioned current threshold may include a first current threshold. The target current in the first DC charging circuit may be a request current sent to the plug at the first DC charging port. The target current in the second DC charging circuit may be a request current sent to the plug at the second DC charging port. The on-board charger includes an AC side and a DC side. It is used to convert the AC power input from the AC side into DC power and output it from the DC side. The AC side of the on-board charger is connected to the AC charging port, and the DC side of the on-board charger is connected to the power battery.

[0068] According to the above current distribution strategy, for example, when Ic≤60A:

[0069] Ic2=0.5(Ic-I obc ); Ic1=Ic-I2-I obc

[0070] Wherein, Ic is the current maximum allowable charging current of the power battery, 60A is the first current threshold, Ic2 is the target current in the second DC charging circuit, Ic1 is the target current in the first DC charging circuit, and I obc is the DC side output current of the on-board charger, and I2 is the current current in the second DC charging circuit.

[0071] When the current maximum allowable charging current of the power battery is greater than the first current threshold, the target current in the second DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the first reserved value, and the smaller value of the following two is determined as the target current in the first DC charging circuit:

[0072] The maximum allowable current of the buck-boost module in the first DC charging circuit; and

[0073] The difference between the current maximum allowable charging current of the power battery and the current current in the second DC charging circuit and the DC side output current of the on-board charger.

[0074] According to the above current distribution strategy, for example, when Ic>60A:

[0075] Ic2=Ic-I obc -P; Ic1 = min(I buck , Ic-I2-I obc )

[0076] Wherein, P is the first reserved value, for example, 30A, I buck is the maximum allowable current of the buck-boost module, and min indicates the minimum value.

[0077] The maximum allowable current of the buck-boost module indicates the maximum value of the current that the buck-boost module can withstand, which is related to the selection of components in the buck-boost module and can be a fixed value.

[0078] In this embodiment, while two DC charging circuits are used simultaneously to increase charging efficiency, the second DC charging circuit (ie, the direct charging circuit) is preferentially used for charging, thereby ensuring the safety of the buck-boost module.

[0079] In another embodiment, the method further includes: when the power battery is DC charged only by the first DC charging circuit, determining the smaller value of the following two as the target current in the first DC charging circuit:

[0080] The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and the maximum allowable current of the buck-boost module in the first DC charging circuit.

[0081] According to the above current distribution strategy, when DC charging is performed only by the first DC charging circuit:

[0082] Ic1=min(Ic-I obc , I buck )

[0083] When the power battery is DC charged only by the second DC charging circuit, the target current in the second DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger.

[0084] According to the above current distribution strategy, when DC charging is performed only by the second DC charging circuit:

[0085] Ic2=Ic-I obc

[0086] In this embodiment, when only one DC charging circuit is effective, the maximum allowable current is fully utilized to ensure the charging speed.

[0087] In another embodiment, the method further includes: if it is determined that the power battery has reached a high charge level, and it is determined that the maximum output current of the charging pile connected to the second DC charging circuit can meet the current charging of the power battery, terminating the charging of the first DC charging circuit.

[0088] When the SOC of the power battery is greater than a predetermined remaining power threshold, it can be determined that the power battery has reached a high power level. When the maximum output current of the charging pile connected to the second DC charging circuit is greater than the current maximum allowable charging current of the power battery, it can be determined that the maximum output current of the charging pile connected to the second DC charging circuit can meet the current charging of the power battery.

[0089] For example, when the SOC of the power battery is greater than 95% and Iz2 ≥ 2Ic + 20A, the charging of the first DC charging circuit is terminated, where Iz2 is the maximum output current of the charging pile connected to the second DC charging circuit, and 20A is a redundant value.

[0090] After the charging of the first DC charging circuit is terminated, the DC charging is still continued through the second DC charging circuit. In this way, the DC charging of the buck-boost circuit can be actively terminated after the power battery reaches a high power level, thereby increasing the service life of the buck-boost module.

[0091] After the charging of the first DC charging circuit is terminated, a prompt message may also be output to prompt the user to remove the charging gun of the first DC charging circuit.

[0092] In yet another embodiment, the at least two DC charging circuits include a third DC charging circuit and a fourth DC charging circuit, and the third DC charging circuit and the fourth DC charging circuit are both direct charging circuits. Figure 4 FIG. 1 is a schematic diagram of two DC charging circuits provided by another exemplary embodiment. Figure 4 As shown, the third DC charging circuit is provided with a third DC charging port, a fifth switch K5, a sixth switch K6 and a buck-boost module. The third DC charging port is connected to the power battery through the fifth switch K5, the sixth switch K6 and the buck-boost module in sequence. The fourth DC charging circuit is provided with a fourth DC charging port, a seventh switch K7, an eighth switch K8 and a buck-boost module. The fourth DC charging port is connected to the power battery through the seventh switch K7, the eighth switch K8 and the buck-boost module in sequence. Figure 5 yes Figure 4 Schematic diagram of two DC charging circuits and one AC charging circuit. Figure 5 As shown, the AC charging port is connected to the power battery through the on-board charger. AC charging and the third DC circuit and the fourth DC circuit charging can be carried out in parallel.

[0093] In yet another embodiment, corresponding to Figure 5 , according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold, determining the current distribution strategy of at least two DC charging circuits, including:

[0094] When the current maximum allowable charging current of the power battery is less than or equal to the second current threshold, the target current in the fourth DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the third DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the fourth DC charging circuit and the DC side output current of the on-board charger.

[0095] The above-mentioned current threshold may include a second current threshold. The target current in the third DC charging loop may be a request current sent to the plug at the third DC charging port. The target current in the fourth DC charging loop may be a request current sent to the plug at the fourth DC charging port.

[0096] According to the above current distribution strategy, for example, when Ic≤120A:

[0097] Ic4=0.5(Ic-I obc ); Ic3 = Ic-I4-I obc

[0098] Among them, 120A is the second current threshold, Ic4 is the target current in the fourth DC charging circuit, Ic3 is the target current in the third DC charging circuit, and I4 is the current current in the fourth DC charging circuit.

[0099] When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the fourth DC charging circuit:

[0100] the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the second reserved value; and the maximum charging current in the fourth DC charging circuit.

[0101] When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the third DC charging circuit:

[0102] The difference between the current maximum allowable charging current of the power battery and the current current in the fourth DC charging circuit and the DC side output current of the on-board charger; and the maximum charging current in the third DC charging circuit.

[0103] According to the above current distribution strategy, for example, when Ic>120A:

[0104] Ic4=min(Ic-I obc -Q, Is4); Ic3 = min (Ic-I4-I obc , Is3)

[0105] Wherein, Q is the second reserved value, for example, 60A, I buck Is the maximum allowable current of the buck-boost module, min indicates the minimum value, Is4 is the maximum charging current in the fourth DC charging circuit, and Is3 is the maximum charging current in the third DC charging circuit. Is4 and Is3 are related to the circuit selection design and can be fixed values.

[0106] Those skilled in the art will appreciate that the third DC charging circuit may be any one of the two DC charging circuits.

[0107] In this embodiment, when two DC charging circuits are used simultaneously, one of the two direct charging circuits is preferentially used for charging, and the maximum charging current in the direct charging circuit is taken into consideration, thereby increasing the charging efficiency while ensuring the safety of charging.

[0108] In another embodiment, the method further includes: when the power battery is DC charged only by the third DC charging circuit, determining the smaller value of the following two as the target current in the third DC charging circuit:

[0109] The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and the maximum charging current of the third DC charging circuit.

[0110] According to the above current distribution strategy, when DC charging is performed only by the third DC charging circuit:

[0111] Ic3=min(Ic-I obc , Is3)

[0112] Those skilled in the art will appreciate that the third DC charging circuit may be any of the two DC charging circuits. Therefore, when DC charging is performed only by the fourth DC charging circuit:

[0113] Ic4=min(Ic-I obc , Is4)

[0114] In this embodiment, a higher charging efficiency is ensured.

[0115] In another embodiment, the method further includes: if it is determined that the power battery has reached a high charge level, and it is determined that the maximum output current of the charging pile connected to the fourth DC charging circuit can meet the current charging of the power battery, terminating the charging of the third DC charging circuit.

[0116] When the SOC of the power battery is greater than a predetermined remaining power threshold, it can be determined that the power battery has reached a high power level. When the maximum output current of the charging pile connected to the fourth DC charging circuit is greater than the current maximum allowable charging current of the power battery, it can be determined that the maximum output current of the charging pile connected to the fourth DC charging circuit can meet the current charging of the power battery.

[0117] For example, when the SOC of the power battery is greater than 95% and Iz4 is greater than or equal to 2Ic+20A, the charging of the third DC charging circuit is terminated, where Iz4 is the maximum output current of the charging pile connected to the fourth DC charging circuit, and 20A is a redundant value.

[0118] After the charging of the third DC charging circuit is terminated, DC charging is still continued through the fourth DC charging circuit, so as to avoid the waste of public resources caused by continuous double-gun charging.

[0119] After the charging of the third DC charging circuit is terminated, a prompt message may also be output to prompt the user to remove the charging gun of the third DC charging circuit.

[0120] Those skilled in the art will appreciate that the third DC charging circuit can be any of the two direct charging circuits, and the method applied to the third DC charging circuit can also be applied to the fourth DC charging circuit. That is, if it is determined that the power battery has reached a high level of power, and it is determined that the maximum output current of the charging pile connected to the third DC charging circuit can meet the current charging of the power battery, the charging of the fourth DC charging circuit is terminated, and DC charging continues through the third DC charging circuit.

[0121] The present disclosure also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor.

[0122] The present disclosure also provides an electronic device, comprising:

[0123] a memory having a computer program stored thereon;

[0124] The processor is used to execute the computer program in the memory to implement the steps of the above method.

[0125] The present disclosure also provides a vehicle, comprising a power battery and the above-mentioned electronic device.

[0126] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0127] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0128] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power battery charging method, characterized in that: The method comprises: When the power battery is DC charged by at least two DC charging circuits at the same time, determining a current maximum allowable charging current of the power battery; A current distribution strategy for the at least two DC charging circuits is determined according to the current maximum allowable charging current of the power battery.

2. The method according to claim 1, characterized in that The determining of the current distribution strategy of the at least two DC charging circuits according to the current maximum allowable charging current of the power battery includes: The current distribution strategy of the at least two DC charging circuits is determined according to a comparison result between the current maximum allowable charging current of the power battery and the current threshold.

3. The method according to claim 2, characterized in that In the case where the power battery is DC charged by two DC charging circuits at the same time, the two DC charging circuits include a first DC charging circuit and a second DC charging circuit, the first DC charging circuit is a boost charging circuit, and the second DC charging circuit is a direct charging circuit.

4. The method according to claim 3, characterized in that The determining of the current distribution strategy of the at least two DC charging circuits according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold comprises: When the current maximum allowable charging current of the power battery is less than or equal to the first current threshold, the target current in the second DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the first DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the second DC charging circuit and the DC side output current of the on-board charger; When the current maximum allowable charging current of the power battery is greater than the first current threshold, the target current in the second DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the first reserved value, and the smaller value of the following two is determined as the target current in the first DC charging circuit: The maximum allowable current of the buck-boost module in the first DC charging circuit; and The difference between the current maximum allowable charging current of the power battery, the current current in the second DC charging circuit, and the DC side output current of the on-board charger.

5. The method according to claim 3, characterized in that: The method further comprises: When the power battery is DC charged only by the first DC charging circuit, the smaller value of the following two is determined as the target current in the first DC charging circuit: The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and the maximum allowable current of the buck-boost module in the first DC charging circuit; When the power battery is DC charged only by the second DC charging circuit, the target current in the second DC charging circuit is determined as: the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger.

6. The method according to claim 3, characterized in that The method further comprises: If it is determined that the power battery has reached a high charge level, and if it is determined that the maximum output current of the charging pile connected to the second DC charging circuit can meet the current charging of the power battery, the charging of the first DC charging circuit is terminated.

7. The method according to claim 2, characterized in that: The at least two DC charging circuits include a third DC charging circuit and a fourth DC charging circuit, and both the third DC charging circuit and the fourth DC charging circuit are direct charging circuits.

8. The method according to claim 7, characterized in that The determining of the current distribution strategy of the at least two DC charging circuits according to the comparison result between the current maximum allowable charging current of the power battery and the current threshold comprises: When the current maximum allowable charging current of the power battery is less than or equal to the second current threshold, the target current in the fourth DC charging circuit is determined as: half of the difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger, and the target current in the third DC charging circuit is determined as the difference between the current maximum allowable charging current of the power battery and the current current in the fourth DC charging circuit and the DC side output current of the on-board charger; When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the fourth DC charging circuit: The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger and the second reserved value; and The maximum charging current in the fourth DC charging circuit; When the current maximum allowable charging current of the power battery is greater than the second current threshold, the smaller value of the following two is determined as the target current in the third DC charging circuit: The difference between the current maximum allowable charging current of the power battery, the current current in the fourth DC charging circuit, and the DC side output current of the on-board charger; and The maximum charging current in the third DC charging circuit.

9. The method according to claim 7, characterized in that: The method further comprises: When the power battery is DC charged only by the third DC charging circuit, the smaller value of the following two is determined as the target current in the third DC charging circuit: The difference between the current maximum allowable charging current of the power battery and the DC side output current of the on-board charger; and The maximum charging current of the third DC charging circuit.

10. The method according to claim 7, characterized in that The method further comprises: If it is determined that the power battery has reached a high charge level, and if it is determined that the maximum output current of the charging pile connected to the fourth DC charging circuit can meet the current charging of the power battery, the charging of the third DC charging circuit is terminated.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 10 are implemented.

12. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 10.

13. A vehicle, characterized in that: It comprises a power battery and the electronic device as claimed in claim 12.

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