Charging method and system of power supply equipment

Abstract

The invention relates to the technical field of intelligent charging, in particular to a charging method of power supply equipment and a system for executing the charging method, and the charging method comprises the following steps: A, obtaining a common time period and current time; b, according to the current time and the common time period, the expected charging duration is calculated; c, acquiring the ambient temperature around the power supply equipment; d, selecting a charging mode of the power supply equipment in combination with the expected charging duration and the environment temperature; wherein the common time period is a time period when the user uses the mobile phone daily; the charging modes comprise high-voltage quick charging, low-voltage quick charging and low-voltage slow charging. The charging mode adopted for the power supply equipment is selected by combining the common time period, the current time and the environment temperature, so that charging is performed in a low-voltage mode to reduce heat production to protect the power supply when the temperature is indicated, charging is performed in a high-voltage mode when the temperature is low to improve heat production to ensure the charging efficiency, and the intelligent charging effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent charging technology, and in particular to a charging method and system for a power supply device. Background Art

[0002] Portable power devices, such as mobile phones and wireless headphones, need to be charged after being used for a period of time. The usual charging method is to directly charge the power device continuously at a predetermined power. When fully charged, keep charging to ensure that the power device is always fully charged before unplugging the charging cable.

[0003] Obviously, under the above scheme, not only does it continue to consume power, but it is also not conducive to the health of the power supply. Based on this, the existing technology provides an intelligently adjusted charging method. For example, when charging a Huawei mobile phone at night, it will not charge for a period of time according to the user's usage habits, and then charge again after the period of time, ensuring that the mobile phone will not be in a fully charged state for a long time.

[0004] However, this method still has shortcomings: the ambient temperature around the power supply equipment will affect its charging efficiency, etc. The intelligent adjustment solution does not take the ambient temperature into consideration, which will inevitably affect whether the power supply is fully charged. Summary of the invention

[0005] The present invention aims to solve the problems in the prior art by providing a charging method and system for a power supply device, and selects a suitable charging mode in combination with the charging time and the ambient temperature, thereby ensuring that the power supply device is charged at a suitable temperature, and ensuring the charging efficiency and charging effect.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a charging method for a power supply device, comprising the following steps:

[0008] A. Get common time periods and current time;

[0009] B. Calculate the expected charging time based on the current time and common time periods;

[0010] C. Obtain the ambient temperature around the power supply equipment;

[0011] D. Select the charging method of the power supply device based on the expected charging time and ambient temperature;

[0012] Among them, the commonly used time period is the time period when the user uses the mobile phone daily; the charging methods include high-voltage fast charging, low-voltage fast charging and low-voltage slow charging.

[0013] Further, step B specifically includes:

[0014] B1. Determine whether the current time is within the commonly used time period, if so, execute step B2, otherwise execute step B3;

[0015] B2. Use low-voltage fast charging to charge the power supply equipment;

[0016] B3. The difference between the current time period and the minimum time value of the next common time period is taken as the expected charging time.

[0017] Furthermore, step D specifically includes:

[0018] D1. Obtain the temperature around the power supply equipment;

[0019] D2. Determine whether the temperature around the power supply device falls within a preset temperature range, if so, execute step D3, otherwise execute step D4;

[0020] D3. Obtain the current power of the power supply device and select a charging method based on the expected charging time;

[0021] D4. If the temperature around the power supply device exceeds the maximum value of the preset temperature range, execute step D5; if the temperature around the power supply device is lower than the minimum value of the preset temperature range, execute step D6;

[0022] D5. Charge the power supply equipment at low voltage and slow speed;

[0023] D6. Perform high-voltage fast charging on the power supply device, and switch to low-voltage fast charging / low-voltage slow charging after a period of time.

[0024] Furthermore, step D3 specifically includes:

[0025] D31. Get the current power of the power device A and the total power of the power device A 总 , charging rate s1 under low voltage fast charging state, charging rate s2 under low voltage slow charging state, and expected charging time t;

[0026] D32. According to the formula (A 总 -A) = s1*t1+s2*t2, calculate t1 and t2;

[0027] D33. Charge the power supply device in the low-voltage fast charging state for t1 time, and then switch to the low-voltage slow charging state until it is fully charged;

[0028] Wherein t=t'+t1+t2; and t' is a constant and the value of t' is 10-20min.

[0029] Furthermore, in step D33, if the power supply device is still connected to the charging device after being fully charged, the charging state is exited until t' / 2 time has passed and then low-voltage slow charging is performed;

[0030] In step D32, if t2 is less than t', t1 and t2 are calculated according to the formula A=s1*t1+s2*t2 and t=t1+t2;

[0031] If t2≤0, the power supply device is charged in a low-voltage fast charging manner.

[0032] Furthermore, step D5 specifically includes:

[0033] D51. Charge the power supply device by low-voltage slow charging and obtain the ambient temperature around the power supply device;

[0034] D52. During the charging process, the ambient temperature around the power supply device is continuously obtained. If the power supply device is fully charged or the ambient temperature around the power supply device is higher than an upper threshold, charging is stopped.

[0035] Furthermore, step D6 specifically includes:

[0036] D61. Perform high-voltage fast charging on the power supply device and obtain the real-time temperature of the power supply device;

[0037] D62. Compare the real-time temperature of the power supply device with the preset temperature range, and when the real-time temperature of the power supply device falls within the preset temperature range, obtain the real-time power of the power supply device;

[0038] D63. Calculate the critical power of the power supply device by combining the maximum value of the preset temperature range, the real-time power of the power supply device, and the real-time temperature of the power supply device;

[0039] D64. When the current power of the power supply device reaches the critical power, the power supply device is switched to low-voltage fast charging or low-voltage slow charging according to the value of the critical power and the expected charging time.

[0040] Furthermore, in step D64, it specifically includes:

[0041] D641. Calculate the expected charging rate s' based on s' = (full charge - critical charge) / (expected charging time - high-voltage fast charging time - t');

[0042] D642. Compare s' with the low-voltage fast charging rate and the low-voltage slow charging rate respectively. If s' is greater than the low-voltage fast charging rate, switch to low-voltage fast charging for charging;

[0043] If s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, switch to low-voltage fast charging;

[0044] If s' is less than the low-voltage slow charging rate, switch to low-voltage fast charging for charging; if s' is less than the low-voltage slow charging rate, switch to low-voltage slow charging for charging;

[0045] Wherein, t” is a constant and 0min≤t”≤20min.

[0046] Furthermore, in step D642, if s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, the following steps are specifically included:

[0047] The power supply device is charged by low-voltage fast charging until the power supply device is fully charged and no further charging is performed;

[0048] The real-time time is obtained. When the real-time time reaches 10-20 minutes before the minimum value of the common time period, the power supply device is continuously charged by using low-voltage slow charging until the power supply device is no longer connected to the charging device.

[0049] The present invention also provides a charging system, including a controller, a power supply unit electrically connected to the controller, and a charging device, wherein the power supply unit is used to supply power to the controller and the charging device, and the charging device is used to connect to an external power supply device and charge the power supply device. The controller has a storage medium, and the storage medium stores a computer program for executing the above-mentioned computer program.

[0050] Beneficial effects of the present invention: The present invention selects a charging method for the power supply device in combination with common time periods, current time and ambient temperature, so that when the temperature is indicated, the device is charged at low voltage to reduce heat generation to protect the power supply, and when the temperature is low, the device is charged at high voltage to increase heat generation to ensure charging efficiency, thereby achieving the effect of intelligent charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0052] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0053] like Figure 1 As shown, the present invention provides a charging method for a power supply device, comprising the following steps:

[0054] A. Get common time periods and current time;

[0055] B. Calculate the expected charging time based on the current time and common time periods;

[0056] C. Obtain the ambient temperature around the power supply equipment;

[0057] D. Select the charging method of the power supply device based on the expected charging time and ambient temperature;

[0058] Among them, the commonly used time period is the time period when the user uses the mobile phone daily; the charging methods include high-voltage fast charging, low-voltage fast charging and low-voltage slow charging.

[0059] In actual application, this embodiment also provides a charging system for executing the above-mentioned charging method, including a controller, a power supply unit electrically connected to the controller, and a charging device, the power supply unit is used to supply power to the controller and the charging device, the charging device is used to connect to an external power supply device and charge the power supply device, the controller has a storage medium, and the storage medium stores a computer program for executing the above-mentioned method.

[0060] This charging method is executed when the charging device is connected to the power supply equipment. There are two ways to obtain the current time, namely directly obtaining the time of the power supply equipment and obtaining it through the controller network; and the common time period is obtained through the power supply equipment. When the power supply equipment is connected to the charging device during the common time period, it is very likely that the power supply equipment is in a state of "charging while in use". At this time, if the ambient temperature is low, high-voltage fast charging is used to charge the power supply equipment, which can ensure high heat generation while charging, so that the power supply of the power supply equipment quickly heats up and remains at a suitable temperature, thereby ensuring charging efficiency.

[0061] In this embodiment, step B specifically includes:

[0062] B1. Determine whether the current time is within the commonly used time period, if so, execute step B2, otherwise execute step B3;

[0063] B2. Use low-voltage fast charging to charge the power supply equipment;

[0064] B3. The difference between the current time period and the minimum time value of the next common time period is taken as the expected charging time.

[0065] If the charging time is not in the common time period, it means that the user is charging the power supply device during a break. In order to avoid a long charging time or power failure due to being plugged in for too long after charging, the present invention will charge according to the time difference between the common time period and the charging time. The following is an example:

[0066] For example, the commonly used time period is from 8:00 to 23:00, and the user occasionally uses the power supply device after 23:00. Then, when the user charges the power supply device at 23:10, the charging time is from 23:10 to 8:00 of the next day, which is 8 hours and 50 minutes of charging time. At this time, the present invention selects its charging mode according to the ambient temperature around the power supply device: high-voltage fast charging will cause greater heat to the power supply during charging, which is easy to shorten the life of the power supply at normal temperature, but at low temperature it can ensure that the power supply is charged at a suitable temperature to ensure efficiency; the low-voltage and high-current charging method generates less heat, but when the surrounding ambient temperature is low, it cannot guarantee charging efficiency. The charging device of the present invention integrates the structure of two charging methods, which are switched according to demand, thereby ensuring that the power supply is charged at a suitable temperature and ensuring charging efficiency.

[0067] In this embodiment, step D specifically includes:

[0068] D1. Obtain the temperature around the power supply equipment;

[0069] D2. Determine whether the temperature around the power supply device falls within a preset temperature range, if so, execute step D3, otherwise execute step D4;

[0070] D3. Obtain the current power of the power supply device and select a charging method based on the expected charging time;

[0071] D4. If the temperature around the power supply device exceeds the maximum value of the preset temperature range, execute step D5; if the temperature around the power supply device is lower than the minimum value of the preset temperature range, execute step D6;

[0072] D5. Charge the power supply equipment at low voltage and slow speed;

[0073] D6. Perform high-voltage fast charging on the power supply device, and switch to low-voltage fast charging / low-voltage slow charging after a period of time.

[0074] That is, when the temperature is too high, the present invention needs to quickly charge the power supply device first to meet its use requirements. However, the current of low-voltage fast charging is larger, and it must generate more heat than low-voltage slow charging, and the performance of some insulation structures will even be reduced at high temperatures. Taking the suitable temperature of 0-40°C as an example, the preset ambient temperature is usually preferably 5-35°C, which gives the present invention a certain buffer zone to ensure the safety of the power supply.

[0075] If the ambient temperature is higher than 35°C, the present invention adopts low-voltage slow charging. If the user uses the power supply device, the charging rate will inevitably be lower than the power consumption rate, which can only ensure that the power consumption rate of the power supply is reduced. It also reminds the user to reduce the frequency of use of the power supply device under high temperature so that its temperature will not be too high.

[0076] If the ambient temperature is lower than 5°C, the ambient temperature will affect the performance and life of the power supply. At this time, high-voltage fast charging is used to increase the heat of the power supply, so that the power supply temperature rises and remains within the preset temperature range for charging or even charging while using, which is beneficial to ensure charging efficiency and power supply performance.

[0077] In this embodiment, step D3 specifically includes:

[0078] D31. Get the current power of the power device A and the total power of the power device A 总 , charging rate s1 under low voltage fast charging state, charging rate s2 under low voltage slow charging state, and expected charging time t;

[0079] D32. According to the formula (A 总 -A) = s1*t1+s2*t2, calculate t1 and t2;

[0080] D33. Charge the power supply device in the low-voltage fast charging state for t1 time, and then switch to the low-voltage slow charging state until it is fully charged;

[0081] Wherein t=t'+t1+t2; and t' is a constant and the value of t' is 10-20min.

[0082] That is, when charging, in addition to the temperature affecting the charging method, the current power of the power supply device when charging is also an important parameter. Take the total power as 100%, A = 20% A 总 For example, you need to charge 80% A 总 Therefore, the time required for low-voltage fast charging and low-voltage slow charging can be calculated according to the formula in step D32. Since the present invention refers to the common time period when people use the power supply device, it is necessary to reserve time t' as a transition time to ensure that the present invention is also in a fully charged state when people use the power supply device in advance.

[0083] And t'=10-20min can meet most usage scenarios, that is, most of the time in the first 20 minutes or so of the common time period, the power supply equipment may be used.

[0084] Since low-voltage slow charging causes less power loss than low-voltage fast charging, using low-voltage slow charging for as long as possible, while ensuring that the power supply equipment can be fully charged, can effectively ensure the safety of the power supply and slow down the rate of power supply attenuation.

[0085] Specifically, in step D33, if the power supply device is still connected to the charging device after being fully charged, the charging state is exited until t' / 2 time has passed and low-voltage slow charging is performed again.

[0086] That is, after being fully charged, the power supply device is promptly powered off, so that the power supply device remains dormant without charging, and only continues to charge when the normal time period is about to arrive. This method reduces the time that the power supply device is plugged into the charging device, thus achieving the effect of protecting the power supply.

[0087] Specifically, in step D32, if t2 is less than t', t1 and t2 are calculated according to the formula A=s1*t1+s2*t2 and t=t1+t2;

[0088] If t2≤0, the power supply device is charged in a low-voltage fast charging manner.

[0089] That is, there is a possibility that the expected charging time of a certain charge is short, resulting in failure to fully charge. In this situation, the present invention must allow the power supply device to maintain low-voltage fast charging throughout the process to ensure that the user charges the power supply device with as much electricity as possible before using the power supply device.

[0090] Similarly, if t2 is less than t', it means that time is tight. In this case, the reserved time t' can be directly cancelled, and charging can still be achieved in accordance with the combination of low-voltage fast charging and low-voltage slow charging to reduce power loss. At this time, even if the user uses the power supply device in advance, it can ensure sufficient power and power safety.

[0091] In this embodiment, step D5 specifically includes:

[0092] D51. Charge the power supply device by low-voltage slow charging and obtain the ambient temperature around the power supply device;

[0093] D52. During the charging process, the ambient temperature around the power supply device is continuously obtained. If the power supply device is fully charged or the ambient temperature around the power supply device is higher than an upper threshold, charging is stopped.

[0094] That is, in a high temperature environment, the present invention only uses low-voltage slow charging to charge the power supply device, thereby reducing the heat generated by the power supply and preventing the temperature from further rising. When the ambient temperature rises further and exceeds the upper threshold (taking the above data as an example, assuming it is 40°C), the power supply device is stopped from being charged to avoid low-temperature burns to the user due to further heating of the power supply device.

[0095] In this embodiment, step D6 specifically includes:

[0096] D61. Perform high-voltage fast charging on the power supply device and obtain the real-time temperature of the power supply device;

[0097] D62. Compare the real-time temperature of the power supply device with the preset temperature range, and when the real-time temperature of the power supply device falls within the preset temperature range, obtain the real-time power of the power supply device;

[0098] D63. Calculate the critical power of the power supply device by combining the maximum value of the preset temperature range, the real-time power of the power supply device, and the real-time temperature of the power supply device;

[0099] D64. When the current power of the power supply device reaches the critical power, the power supply device is switched to low-voltage fast charging or low-voltage slow charging according to the value of the critical power and the expected charging time.

[0100] When the ambient temperature is low, the present invention adopts high-voltage fast charging, which ensures the charging rate and also ensures that the power supply heats up and the power supply device heats up, thereby ensuring the performance of the power supply. When the heat reaches a certain level, the subsequent actions need to be analyzed: for example, the temperature of the heat makes the current temperature of the power supply device at 30°C, and the temperature decay rate is calculated based on the difference between the current temperature of the power supply device and the ambient temperature, and then combined with the heat generation efficiency of the power supply device under low-voltage charging, it is calculated whether to maintain high-voltage fast charging or switch to low-voltage charging.

[0101] That is to say, when the power supply device is heated to the required temperature, according to the formula (A 总 -A)=s1*t1+s2*t2, check whether the power supply device still needs fast charging, if so, switch to low-voltage fast charging, otherwise switch to low-voltage slow charging.

[0102] In actual use, step D64 specifically includes:

[0103] D641. Calculate the expected charging rate s' based on s' = (full charge - critical charge) / (expected charging time - high-voltage fast charging time - t');

[0104] D642. Compare s' with the low-voltage fast charging rate and the low-voltage slow charging rate respectively. If s' is greater than the low-voltage fast charging rate, switch to low-voltage fast charging for charging;

[0105] If s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, switch to low-voltage fast charging;

[0106] If s' is less than the low-voltage slow charging rate, switch to low-voltage fast charging for charging; if s' is less than the low-voltage slow charging rate, switch to low-voltage slow charging for charging;

[0107] Wherein, t” is a constant and 0min≤t”≤20min.

[0108] That is, the specific scheme executed in step D64 needs to be executed according to the charging rate s', and the execution of steps D641 and D642 is set based on the temperature of the power supply device reaching the required temperature. Even if the temperature decays later, it ensures that the power supply device will not decay to a temperature that significantly affects the charging rate and performance before being fully charged.

[0109] If the power supply device does not generate enough heat and still does not reach the required temperature when it reaches the critical power, high-voltage fast charging will still need to be maintained subsequently. That is, the surrounding ambient temperature has a higher priority for the charging method selection than the current power, common time period, etc.

[0110] Specifically, in step D642, if s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, the following steps are specifically included:

[0111] The power supply device is charged by low-voltage fast charging until the power supply device is fully charged and no further charging is performed;

[0112] The real-time time is obtained. When the real-time time reaches 10-20 minutes before the minimum value of the common time period, the power supply device is continuously charged by using low-voltage slow charging until the power supply device is no longer connected to the charging device.

[0113] That is, when s' is exactly at the middle value, the present invention tends to directly use low-voltage fast charging to fully charge the power supply, thereby ensuring that charging is completed before the temperature of the power supply device decays to a temperature that is not much different from the surrounding ambient temperature; the power supply device is subsequently kept in a sleep state until before a commonly used time period (for example, 7:40), and low-voltage slow charging is continued, thereby achieving the goal of keeping the power supply device in a fully charged state before the user unplugs the power supply device from the charging device.

[0114] It should be noted that the ambient temperature around the power supply device can be obtained through a temperature sensor built into the power supply device, or a temperature sensor connected to the controller signal can be integrated in the charging device. Preferably, since the present invention not only involves the ambient temperature around the power supply device, but also involves the temperature of the power supply device itself, it is necessary to acquire the temperature of the power supply device itself by collecting data of the power supply device, and to acquire the ambient temperature of the power supply device by the temperature sensor of the charging device.

[0115] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A charging method for a power supply device, characterized in that: The following steps are involved: A. Get common time periods and current time; B. Calculate the expected charging time based on the current time and common time periods; C. Obtain the ambient temperature around the power supply equipment; D. Select the charging method of the power supply device based on the expected charging time and ambient temperature; Among them, the commonly used time period is the time period when the user uses the mobile phone daily; the charging methods include high-voltage fast charging, low-voltage fast charging and low-voltage slow charging.

2. The charging method of the power supply device according to claim 1, characterized in that: Step B specifically includes: B1. Determine whether the current time is within the commonly used time period, if so, execute step B2, otherwise execute step B3; B2. Use low-voltage fast charging to charge the power supply equipment; B3. The difference between the current time period and the minimum time value of the next common time period is taken as the expected charging time.

3. The charging method of the power supply device according to claim 2, characterized in that: Step D specifically includes: D1. Obtain the temperature around the power supply equipment; D2. Determine whether the temperature around the power supply device falls within a preset temperature range, if so, execute step D3, otherwise execute step D4; D3. Obtain the current power of the power supply device and select a charging method based on the expected charging time; D4. If the temperature around the power supply device exceeds the maximum value of the preset temperature range, execute step D5; if the temperature around the power supply device is lower than the minimum value of the preset temperature range, execute step D6; D5. Charge the power supply equipment at low voltage and slow speed; D6. Perform high-voltage fast charging on the power supply device, and switch to low-voltage fast charging / low-voltage slow charging after a period of time.

4. The charging method of the power supply device according to claim 3, characterized in that: Step D3 specifically includes: D31. Get the current power of the power device A and the total power of the power device A 总 , charging rate s1 under low voltage fast charging state, charging rate s2 under low voltage slow charging state, and expected charging time t; D32. According to the formula (A 总 -A) = s1*t1+s2*t2, calculate t1 and t2; D33. Charge the power supply device in the low-voltage fast charging state for t1 time, and then switch to the low-voltage slow charging state until it is fully charged; Wherein t=t'+t1+t2; and t' is a constant and the value of t' is 10-20min.

5. The charging method of the power supply device according to claim 4, characterized in that: In step D33, if the power supply device is still connected to the charging device after being fully charged, the charging state is exited until t' / 2 time has passed and then low-voltage slow charging is performed; In step D32, if t2 is less than t', t1 and t2 are calculated according to the formula A=s1*t1+s2*t2 and t=t1+t2; If t2≤0, the power supply device is charged in a low-voltage fast charging manner.

6. The charging method of the power supply device according to claim 3, characterized in that: Step D5 specifically includes: D51. Charge the power supply device by low-voltage slow charging and obtain the ambient temperature around the power supply device; D52. During the charging process, the ambient temperature around the power supply device is continuously obtained. If the power supply device is fully charged or the ambient temperature around the power supply device is higher than an upper threshold, charging is stopped.

7. The charging method of the power supply device according to claim 3, characterized in that: Step D6 specifically includes: D61. Perform high-voltage fast charging on the power supply device and obtain the real-time temperature of the power supply device; D62. Compare the real-time temperature of the power supply device with the preset temperature range, and when the real-time temperature of the power supply device falls within the preset temperature range, obtain the real-time power of the power supply device; D63. Calculate the critical power of the power supply device by combining the maximum value of the preset temperature range, the real-time power of the power supply device, and the real-time temperature of the power supply device; D64. When the current power of the power supply device reaches the critical power, the power supply device is switched to low-voltage fast charging or low-voltage slow charging according to the value of the critical power and the expected charging time.

8. The charging method of the power supply device according to claim 7, characterized in that: In step D64, it specifically includes: D641. Calculate the expected charging rate s' based on s' = (full charge - critical charge) / (expected charging time - high-voltage fast charging time - t'); D642. Compare s' with the low-voltage fast charging rate and the low-voltage slow charging rate respectively. If s' is greater than the low-voltage fast charging rate, switch to low-voltage fast charging for charging; If s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, switch to low-voltage fast charging; If s' is less than the low-voltage slow charging rate, switch to low-voltage fast charging for charging; if s' is less than the low-voltage slow charging rate, switch to low-voltage slow charging for charging; Wherein, t” is a constant and 0min≤t”≤20min.

9. The charging method of the power supply device according to claim 8, characterized in that: In step D642, if s' is less than the low-voltage fast charging rate and greater than the low-voltage slow charging rate, the following steps are specifically included: The power supply device is charged by low-voltage fast charging until the power supply device is fully charged and no further charging is performed; The real-time time is obtained. When the real-time time reaches 10-20 minutes before the minimum value of the common time period, the power supply device is continuously charged by using low-voltage slow charging until the power supply device is no longer connected to the charging device.

10. A charging system, comprising a controller, a power supply unit electrically connected to the controller, and a charging device, wherein the power supply unit is used to supply power to the controller and the charging device, and the charging device is used to connect to an external power supply device and charge the power supply device, characterized in that: The controller comprises a storage medium storing a computer program for executing any one of claims 1 to 9.

Images