Charging control method and charging equipment

Abstract

The invention provides a charging control method and charging equipment, and the method comprises the steps: determining the current values of a first charging current and a second charging current of the charging equipment, the current value of the first charging current being a rated charging current value of the charging equipment, and the current value of the second charging current being greater than the rated charging current value; whether a preset high-current charging condition is met or not is judged, and if yes, second charging current is adopted to charge the load; and in the process of charging the load by adopting the second charging current, judging whether a preset first current switching condition is met or not, and if so, switching to adopting the first charging current to charge the load. According to the invention, on the basis of satisfying the charging safety, the performance of the charging equipment can be fully exerted, and the charging efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a charging control method and charging equipment. Background Art

[0002] With the continuous advancement of technology, batteries, as an important component of electric vehicles and electronic products, have gradually become an indispensable energy supply in people's lives. However, current battery charging technology still faces many challenges in terms of charging time and cost. Traditional charging methods mainly include constant current charging, constant voltage charging, and a combination of the two, constant current-constant voltage charging. Although simple and easy to implement, these methods have some obvious disadvantages, such as not fully utilizing the performance of the charging equipment, slow charging speed, large charging equipment design margin, and poor charging flexibility. Summary of the Invention

[0003] In response to the problems in the prior art, the purpose of this application is to provide a charging control method and charging equipment, which can fully utilize the performance of the charging equipment on the basis of ensuring charging safety, thereby improving charging efficiency.

[0004] The present invention provides a charging control method, including:

[0005] determining current values ​​of a first charging current and a second charging current of the charging device, wherein the current value of the first charging current is a rated charging current value of the charging device, and the current value of the second charging current is greater than the rated charging current value;

[0006] Determining whether a preset high-current charging condition is met, and if so, charging the load with a second charging current;

[0007] In the process of charging the load with the second charging current, it is determined whether a preset first current switching condition is met. If so, the first current is switched to charging the load with the first charging current.

[0008] In some embodiments, determining whether a preset high current charging condition is met includes the following steps:

[0009] Collect the load temperature, load voltage and charging device temperature;

[0010] Determine whether the following conditions are simultaneously met: the temperature of the load is less than a first temperature threshold, the temperature of the charging device is less than a second temperature threshold, and the load voltage is within a preset constant current charging load voltage range;

[0011] If so, it is determined that the high current charging condition is met.

[0012] In some embodiments, determining whether a preset first current switching condition is satisfied includes the following steps:

[0013] During the process of charging the load with the second charging current, collecting the temperature of the load and the temperature of the charging device;

[0014] Determine whether: the temperature of the load is greater than a third temperature threshold or the temperature of the charging device is greater than a fourth temperature threshold;

[0015] If yes, it is determined that the preset first current switching condition is met.

[0016] In some embodiments, the following steps are also included:

[0017] During the process of charging the load with the first charging current, collecting the temperature of the load and the temperature of the charging device;

[0018] Determine whether: the temperature of the load is less than a first temperature threshold and the temperature of the charging device is less than a second temperature threshold;

[0019] If yes, it is determined that the preset second current switching condition is met, and the second charging current is switched to charge the load.

[0020] In some embodiments, determining whether a preset first current switching condition is satisfied includes the following steps:

[0021] During charging of the load using the second charging current, determining whether a charging time using the second charging current in a current high-low current switching cycle is greater than or equal to a first time threshold, where the first time threshold is determined based on a preset high-low current switching frequency;

[0022] If yes, it is determined that the preset first current switching condition is met.

[0023] In some embodiments, the following steps are also included:

[0024] During the process of charging the load using the first charging current, determining whether the charging time using the first charging current in the current high-low current switching cycle is greater than or equal to a second time threshold, where the second time threshold is determined according to a preset high-low current switching frequency;

[0025] If yes, it is determined that the preset current switching condition is met, and the current is switched to charging the load using the second charging current.

[0026] In some embodiments, determining the current values ​​of the first charging current and the second charging current of the charging device includes the following steps:

[0027] determining a current value of the first charging current according to a rated charging current value of the charging device;

[0028] The current value of the second charging current is calculated according to the rated charging current value of the charging device and a preset coefficient, where the preset coefficient is greater than 1.

[0029] In some embodiments, during the process of charging the load using the first charging current and the second charging current, the load voltage of the load is collected to determine whether the load voltage is within a preset constant voltage charging load voltage range. If so, the constant voltage charging mode is switched to charge the load.

[0030] The present application also provides a charging device, including:

[0031] A charging circuit, used to transfer electric energy from the power supply to the load to supply power to the load;

[0032] a current determination module, configured to determine a first charging current and a second charging current of a charging device, wherein the current value of the first charging current is a rated charging current value of the charging device, and the current value of the second charging current is greater than the rated charging current value;

[0033] A charging control module is used to control the process of the charging circuit charging the load, wherein the charging control module is used to determine whether a preset high-current charging condition is met, and if so, control the charging circuit to use the second charging current to charge the load; and when the charging circuit uses the second charging current to charge the load, determine whether a preset first current switching condition is met, and if so, switch to controlling the charging circuit to use the first charging current to charge the load.

[0034] The charging control method and charging device provided in this application have the following advantages:

[0035] By adopting this application, a load is charged by switching between a second charging current higher than the rated charging current and a first charging current equal to the rated charging current. The second charging current can fully utilize the performance of the charging device, and the higher charging current can improve charging efficiency. At the same time, when the preset first current switching conditions are met, the charging process is promptly switched to the first charging current, thereby ensuring the safety of the charging process. Therefore, this charging control method can fully utilize the performance of the charging device while ensuring the safety of the charging process, and is conducive to improving charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0037] Figure 1 is a flow chart of a charging control method according to an embodiment of the present application;

[0038] Figure 2 This is a flowchart of determining whether high current charging conditions are met according to an embodiment of the present application;

[0039] Figure 3 is a schematic diagram showing the change of current over time during the constant current charging stage according to an embodiment of the present application;

[0040] Figure 4 This is a flow chart of a charging control method according to one embodiment of the present application;

[0041] Figure 5 is a flow chart of a charging control method according to another embodiment of the present application;

[0042] Figure 6 This is a structural block diagram of a charging device according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the same reference numerals represent the same or similar structures, and thus their repeated description will be omitted. "Or" and "or" in the specification may both mean "and" or "or". In addition, the drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. Although "first" or "second" and the like are used in this specification to represent certain features, they are only used to represent the function and are not intended to limit the number and importance of specific features.

[0044] like Figure 1 As shown, an embodiment of the present application provides a charging control method for controlling the charging process of a charging device to a load, the method comprising the following steps:

[0045] S100: Determine current values ​​of a first charging current and a second charging current of a charging device, where the current value of the first charging current is a rated charging current value of the charging device, and the current value of the second charging current is greater than the rated charging current value;

[0046] In this embodiment, in step S100, determining the current values ​​of the first charging current and the second charging current of the charging device includes: determining the current value of the first charging current based on the rated charging current value of the charging device; calculating the current value of the second charging current based on the rated charging current value of the charging device and a preset coefficient, where the preset coefficient is greater than 1; alternatively, the current value of the second charging current may be calculated in advance based on the rated charging current and the preset coefficient and stored, and the current value of the second charging current may be directly read when executing the charging control method;

[0047] The current value of the second charging current is greater than the rated charging current value. At the same time, the current value of the second charging current cannot be set too large. Optionally, the preset coefficient is 1.2 to 1.5, and the current value of the second charging current is 1.2 to 1.5 times the rated charging current value. For example, when the rated charging current value is 4A and the preset coefficient is 1.5, the current value of the second charging current is 6A; however, the present application is not limited thereto. Depending on the performance of different charging devices, the multiple of the second charging current to the rated charging current may also be other values, such as 1.1 times, 1.6 times, etc.;

[0048] S200: Determine whether a preset high current charging condition is met, and if so, use a second charging current to charge the load;

[0049] S300: During the process of charging the load with the second charging current, determining whether a preset first current switching condition is satisfied, and if so, switching to charging the load with the first charging current;

[0050] During the process of charging the load with the second charging current, if the preset first current switching condition is not satisfied, the load is continuously charged with the second charging current.

[0051] The rated charging current of a charging device refers to the maximum safe charging current that the device can continuously and stably output under standard design conditions. This rating is marked on the device when it leaves the factory. However, for qualified charging equipment, the rated charging current is only a safe charging current value that can be stably output over a long period of time. In reality, the charging device can also support higher charging currents and charging speeds. Traditional charging equipment generally uses the rated charging current or a charging current lower than the rated charging current to charge the load, which cannot fully utilize the performance of the charging device and also limits the charging speed.

[0052] By adopting the charging control method of the present application, a load is charged by switching between a second charging current higher than the rated charging current and a first charging current equal to the rated charging current. The second charging current can fully utilize the performance of the charging device, and the higher charging current can improve charging efficiency. At the same time, when the preset first current switching conditions are met, the charging process is promptly switched to the first charging current, thereby ensuring the safety of the charging process. Therefore, this charging control method can fully utilize the performance of the charging device while ensuring the safety of the charging process, and is conducive to improving charging efficiency.

[0053] like Figure 2 As shown, in this embodiment, in step S200, determining whether the preset high current charging condition is met includes the following steps:

[0054] Collect the temperature of the load, the load voltage, and the temperature of the charging device; the load temperature can be collected by a temperature sensor provided on the load, the load voltage can be obtained by sampling the voltage at the power input terminal of the load, and the temperature of the charging device can be collected by a temperature sensor provided on the charging device;

[0055] Determine whether the following conditions are simultaneously met: the temperature of the load is less than a first temperature threshold, the temperature of the charging device is less than a second temperature threshold, and the load voltage is within a preset constant current charging load voltage range; wherein the specific values ​​of the first temperature threshold and the second temperature threshold are set according to the characteristics of the load and the charging device, and the first temperature threshold and the second temperature threshold may be set to the same value or different values;

[0056] If so, it is determined that the high current charging condition is met.

[0057] The constant current charging load voltage range can be set according to different load types. For example, when the load is a lithium battery, the lower limit of the constant current charging load voltage range can be set to 2.8V and the upper limit can be set to 4.2V. The constant current charging load voltage range is 2.8V to 4.2V. The values ​​here are only examples and are not intended to limit the scope of protection of this application.

[0058] If the high-current charging conditions are not met, the situation where the high-current charging conditions are not met is determined. If the load voltage meets the requirements but the temperature does not meet the high-current charging conditions, the load is charged using the first charging current. If the temperature of the load and the charging device meet the requirements, but the load voltage does not meet the requirements, it is further determined whether the load voltage is higher than the constant current charging load voltage range. If the load voltage is higher than the upper limit of the constant current charging load voltage range, it indicates that constant voltage charging should be used. The output current of the charging device is controlled according to the preset constant voltage charging voltage so that the output voltage of the charging device is equal to the constant voltage charging voltage. If the load voltage is lower than the lower limit of the constant current charging load voltage range, it indicates that the current load voltage is low and pre-charging is required for activation. For example, a low current of 0.1C to 0.2C (C is the battery capacity) is used for pre-charging until the load voltage is within the constant current charging load voltage range. Then, the constant current charging mode is switched to and the load is charged using the second charging current. If both the load voltage and temperature do not meet the requirements, an abnormality is reported, or pre-charging is performed after the temperature drops to meet the requirements.

[0059] In this embodiment, the charging control method further includes the following steps:

[0060] During the process of charging the load with the first charging current, determining whether a preset second current switching condition is met, and if so, switching to charging the load with the second charging current;

[0061] During the process of charging the load with the first charging current, if the preset second current switching condition is not satisfied, the load continues to be charged with the first charging current.

[0062] Therefore, during the constant current charging process, the process of charging with the first charging current and the process of charging with the second charging current can be switched according to the situation. Figure 3 The diagram schematically shows the change of current over time during the constant current charging phase. The dotted line indicates the rated charging current value. I1 represents the current value of the first charging current, which is equal to the rated charging current value, and I2 represents the current value of the second charging current, which is greater than the rated charging current value. During the constant current charging phase, the load is charged alternately with the second charging current and the first charging current at a lower switching frequency. The switching frequency between the first charging current and the second charging current can be a preset value, or the switching frequency between the first charging current and the second charging current can also be adaptively switched according to the state of the load and the charging device.

[0063] In one embodiment, the first charging current charging and the second charging current charging are adaptively switched according to the state of the load and the charging device.

[0064] like Figure 4 As shown, in this embodiment, in the process of charging the load with the second charging current in step S300, determining whether the preset first current switching condition is met includes the following steps:

[0065] During the process of charging the load with the second charging current, collecting the temperature of the load and the temperature of the charging device;

[0066] Determining whether: the temperature of the load is greater than a third temperature threshold or the temperature of the charging device is greater than a fourth temperature threshold; wherein the values ​​of the third temperature threshold and the fourth temperature threshold may be set according to characteristics of the load and the charging device, and the third temperature threshold and the fourth temperature threshold may be the same value or different values;

[0067] If yes, it is determined that the preset first current switching condition is met, and the first charging current is switched to charge the load;

[0068] If not, it is determined that the preset first current switching condition is not met, and the second charging current continues to be used to charge the load.

[0069] like Figure 4 As shown, in the process of charging the load with the first charging current, determining whether the preset second current switching condition is met includes the following steps:

[0070] During the process of charging the load with the first charging current, collecting the temperature of the load and the temperature of the charging device;

[0071] Determine whether: the temperature of the load is less than a first temperature threshold and the temperature of the charging device is less than a second temperature threshold;

[0072] If yes, it is determined that the preset second current switching condition is met, and the second charging current is switched to charge the load;

[0073] If not, it is determined that the preset second current switching condition is not met, and the first charging current continues to be used to charge the load.

[0074] Optionally, the third temperature threshold is greater than the first temperature threshold, and the fourth temperature threshold is greater than the second temperature threshold. For example, the first temperature threshold and the second temperature threshold are set to 25°C, and the third temperature threshold and the fourth temperature threshold are set to 30°C. When the charging device is initially started to charge, when the load voltage meets the constant current charging load voltage range, the load voltage and the temperature of the charging device must be less than 25°C before the second charging current can be used to charge the load. During the process of charging with the second charging current, if at least one of the load voltage and the temperature of the charging device is greater than 30°C, the first charging current is switched to charge the load. During the process of charging with the first charging current, if the load voltage and the temperature of the charging device are both less than 25°C, the second charging current is switched to charge the load. By making the third temperature threshold greater than the first temperature threshold and the fourth temperature threshold greater than the second temperature threshold, frequent switching between the first charging current charging mode and the second charging current charging mode can be avoided.

[0075] When the temperature-based adaptive switching between the first charging current charging mode and the second charging current charging mode is adopted, the charging time of each charging mode of the first charging current charging mode and the charging time of each charging mode of the second charging current charging mode can reach the minute level, thereby realizing ultra-low frequency switching between the first charging current charging mode and the second charging current charging mode. Among them, the switching frequency of the charging process of the first charging current and the charging process of the second charging current is 0.0001Hz~0.1Hz, that is, a switching cycle is set to include a continuous second charging current charging process and a continuous first charging current charging process, then the time length of a switching cycle is (1 / 0.0001)s~(1 / 0.1)s, which can reach a switching cycle of more than 10s or even minutes, effectively reducing or eliminating the polarization phenomenon of the battery, improving the charging acceptance capacity of the load, solving the problems of severe load polarization and low charging efficiency in traditional charging methods, avoiding damage to the load caused by frequent switching of different charging current modes, and effectively extending the load life. The range of switching frequencies for the charging process using the first charging current and the charging process using the second charging current is provided here for example only. In actual applications, due to changes in load type, charging device type, charging environment, etc., the switching frequency may be other values ​​and is not limited to the range listed here.

[0076] Therefore, in this embodiment, efficient and safe charging is achieved through a specific charging current pulse sequence. Before the charging device or load reaches the protection temperature or limit temperature, the charging current can be automatically reduced to the rated charging current. After the temperature returns to a stable state, it returns to a constant charging current exceeding the rated charging current. This significantly improves the utilization rate of the charging device and reduces the charging time. Therefore, on the basis of ensuring charging safety, the performance of the charging device is fully utilized and the charging efficiency is improved. This method meets the demand for fast charging and is particularly suitable for some application scenarios with high charging speed requirements. This embodiment can adaptively switch different charging currents according to the load status and the charging device status, making the charging method more flexible, improving the adaptability and practicality of the charging method, and solving the problem of the lack of dynamic adjustment capability of the charging method in the prior art. At the same time, because this embodiment performs adaptive adjustment based on the real-time load temperature and charging device temperature, it can fully adapt to different load and environmental conditions and can charge well even if the load type or environment changes significantly.

[0077] In another embodiment, the switching period between charging with the first charging current and charging with the second charging current is a preset period, that is, the two charging current modes are switched through a preset switching period. A switching period is set to include one continuous charging process with the second charging current and one continuous charging process with the first charging current. The high and low current switching frequencies of the charging process using the first charging current and the charging process using the second charging current are preset. The high and low current switching frequencies are set to a value that satisfies 0.0001 Hz to 0.1 Hz. Then, the duration of one switching period is (1 / 0.0001) s to (1 / 0.1) s.

[0078] like Figure 5 As shown, in this another embodiment, in the process of charging the load with the second charging current in step S300, determining whether the preset first current switching condition is met includes the following steps:

[0079] During charging of the load using the second charging current, determining whether a charging time using the second charging current in a current high-low current switching cycle is greater than or equal to a first time threshold, where the first time threshold is determined based on a preset high-low current switching frequency;

[0080] If yes, it is determined that the preset first current switching condition is met.

[0081] like Figure 5 As shown, in the process of charging the load with the first charging current, it is determined whether the preset second current switching condition is met. In the process of charging the load with the first charging current, it is determined whether the charging time using the first charging current in the current high-low current switching cycle is greater than or equal to a second time threshold, and the second time threshold is determined according to the preset high-low current switching frequency;

[0082] If yes, it is determined that the preset current switching condition is met, and the current is switched to charging the load using the second charging current.

[0083] Among them, the first time threshold is calculated as t1*k based on the time length t1 of a switching cycle and the occupancy time ratio k of the second charging current mode in each switching cycle, then the second time threshold corresponding to the first charging current mode in the switching cycle is t1*(1-k), k is a value less than 1 and greater than 0, and the time length of a switching cycle is the inverse of the high and low current switching frequency.

[0084] For each type of charging device, the high and low current switching frequency and the occupancy time ratio k of the second charging current mode can be calibrated in advance before leaving the factory, and the calibrated values ​​are stored in the charging controller of the charging device, and the stored values ​​are directly read during the charging process.

[0085] During the entire constant current charging process, the high-low current switching frequency and the occupancy time ratio of the second charging current mode in each switching cycle can be fixed values, and the first time threshold and the second time threshold are fixed values. Alternatively, the entire constant current charging process can be divided into several stages according to the load voltage, and different stages correspond to different load voltage ranges. Different stages are pre-calibrated with different high-low current switching frequencies and occupancy time ratios k. When determining the first time threshold and the second time threshold, the current stage is determined according to the current load voltage, the high-low current switching frequency and occupancy time ratio k of the current stage are obtained, and the first time threshold and the second time threshold of the current stage are calculated.

[0086] This switching method with a fixed switching frequency is simpler to implement in applications and has higher algorithm processing efficiency.

[0087] In this embodiment, during the process of charging the load using the first charging current and the second charging current, the load voltage of the load is collected to determine whether the load voltage is within a preset constant voltage charging load voltage range. If so, the load is charged using a constant voltage charging mode. The lower limit of the constant voltage charging load voltage range corresponds to the upper limit of the constant current charging load voltage range, and the upper limit of the constant voltage charging load voltage range corresponds to the load voltage when the load is fully charged.

[0088] Therefore, the overall charging process of the load in this embodiment may include the following steps: when the charging device is started to charge the load, if the load voltage is less than the lower limit of the constant current charging load voltage range, pre-charging is first performed, and after the pre-charging is completed, the load is charged using a constant current charging method. During the constant current charging process, Figure 4 The switching mode shown or Figure 5 The switching method shown switches the second charging current charging mode and the first charging current charging mode. When the constant current charging is performed until the load voltage rises to the constant voltage charging load voltage range, the constant voltage charging mode is switched to continue charging. The constant voltage charging mode is used to charge until the load voltage reaches the charging voltage and then stops charging.

[0089] like Figure 6 As shown, the embodiment of the present application further provides a charging device, including:

[0090] The charging circuit M100 is used to transmit power from the power supply to the load to supply power to the load. The charging circuit M100 may include, for example, a transformer, a rectifier and filter circuit, a switch, and other circuits or components. The charging circuit M100 is used to convert the power from the power supply into stable power that meets the load's requirements and is output to the load through the output port of the charging device. The power supply may be, for example, an external power supply or a battery installed in the charging device.

[0091] a current determination module M200, configured to determine a first charging current and a second charging current of a charging device, wherein the first charging current is a rated charging current of the charging device, and the second charging current is greater than the rated charging current;

[0092] The charging control module M300 is used to control the process of the charging circuit charging the load, wherein the charging control module is used to determine whether the preset high-current charging condition is met. If so, the charging circuit is controlled to use the second charging current to charge the load; and when the charging circuit uses the second charging current to charge the load, it is used to determine whether the preset first current switching condition is met. If so, the charging circuit is switched to use the first charging current to charge the load.

[0093] In the charging device, the functions of the current determination module M200 and the charging control module M300 can be implemented by using the specific implementation of the above-mentioned charging control method, which will not be described in detail here.

[0094] By adopting the charging device of the present application, a load is charged by switching between a second charging current higher than the rated charging current and a first charging current equal to the rated charging current. The use of the second charging current fully utilizes the performance of the charging device, and the higher charging current improves charging efficiency. Furthermore, when the preset first current switching conditions are met, the device promptly switches to the first charging current, thereby ensuring the safety of the charging process. Therefore, this charging control system fully utilizes the performance of the charging device while ensuring the safety of the charging process, and is conducive to improving charging efficiency.

[0095] The above content is a further detailed description of the present application in conjunction with specific preferred embodiments, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered to fall within the scope of protection of the present application.

Claims

1. A charging control method, characterized in that: include: determining current values ​​of a first charging current and a second charging current of a charging device, wherein the current value of the first charging current is a rated charging current value of the charging device, and the current value of the second charging current is greater than the rated charging current value; determining whether a preset high-current charging condition is met, and if so, charging the load with the second charging current; In the process of using the second charging current to charge the load, it is determined whether a preset first current switching condition is met. If so, switching to using the first charging current to charge the load.

2. The charging control method according to claim 1, wherein: The step of determining whether a preset high current charging condition is met comprises the following steps: collecting the temperature of the load, the load voltage, and the temperature of the charging device; Determine whether the following conditions are simultaneously met: the temperature of the load is less than a first temperature threshold, the temperature of the charging device is less than a second temperature threshold, and the load voltage is within a preset constant current charging load voltage range; If so, it is determined that the high current charging condition is met.

3. The charging control method according to claim 1, wherein: In the process of charging the load with the second charging current, determining whether a preset first current switching condition is met includes the following steps: During the process of charging the load with the second charging current, collecting the temperature of the load and the temperature of the charging device; Determine whether: the temperature of the load is greater than a third temperature threshold or the temperature of the charging device is greater than a fourth temperature threshold; If yes, it is determined that the preset first current switching condition is met.

4. The charging control method according to claim 3, wherein: The following steps are also included: During the process of charging the load with the first charging current, collecting the temperature of the load and the temperature of the charging device; Determine whether: the temperature of the load is lower than a first temperature threshold and the temperature of the charging device is lower than a second temperature threshold; If yes, it is determined that the preset second current switching condition is met, and the method switches to using the second charging current to charge the load.

5. The charging control method according to claim 1, wherein: In the process of charging the load with the second charging current, determining whether a preset first current switching condition is met includes the following steps: During charging of the load using the second charging current, determining whether a charging time using the second charging current in a current high-low current switching cycle is greater than or equal to a first time threshold, where the first time threshold is determined based on a preset high-low current switching frequency; If yes, it is determined that the preset first current switching condition is met.

6. The charging control method according to claim 5, characterized in that: The following steps are also included: During charging of the load using the first charging current, determining whether a charging time using the first charging current in a current high-low current switching cycle is greater than or equal to a second time threshold, where the second time threshold is determined according to a preset high-low current switching frequency; If yes, it is determined that the preset current switching condition is met, and the current is switched to charging the load using the second charging current.

7. The charging control method according to claim 1, wherein: Determining the current values ​​of the first charging current and the second charging current of the charging device includes the following steps: determining a current value of the first charging current according to a rated charging current value of the charging device; The current value of the second charging current is calculated according to the rated charging current value of the charging device and a preset coefficient, where the preset coefficient is greater than 1.

8. The charging control method according to claim 1, wherein: In the process of charging the load using the first charging current and the second charging current, the load voltage of the load is collected to determine whether the load voltage is within a preset constant voltage charging load voltage range. If so, the constant voltage charging mode is switched to charge the load.

9. A charging device, characterized in that: include: a charging circuit, configured to transmit electrical energy from the power supply to a load to supply power to the load; a current determining module, configured to determine current values ​​of a first charging current and a second charging current of a charging device, wherein the current value of the first charging current is a rated charging current value of the charging device, and the current value of the second charging current is greater than the rated charging current value; a charging control module, configured to control the process of the charging circuit charging the load, wherein the charging control module is configured to determine whether a preset high-current charging condition is satisfied, and if so, control the charging circuit to charge the load with the second charging current; and, during the process of the charging circuit charging the load with the second charging current, determine whether a preset first current switching condition is satisfied, and if so, switch to controlling the charging circuit to charge the load with the first charging current.

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