Rechargeable battery saturation judgment method and charging device

Abstract

The invention discloses a saturation judgment method of a rechargeable battery and a charging device, and relates to the technical field of battery charging devices. The method comprises the following steps: acquiring an initial battery voltage of a rechargeable battery at a first initial time in a charging process; after the first preset time interval, obtaining the current battery voltage of the rechargeable battery at the first current time in the charging process; subtracting the initial battery voltage from the current battery voltage to determine a battery voltage difference value; the current battery voltage is updated to be the initial battery voltage, and the current battery voltage continues to be obtained to update the battery voltage difference value; the number of times that the battery voltage difference value is continuously larger than a preset voltage difference value is obtained, and when the number is larger than or equal to a preset number, the rechargeable battery is saturated. Whether the battery is fully charged or not is judged according to the battery voltage difference value and the number of changes, so that the surface temperature of the rechargeable battery is controlled, the problem that the rechargeable battery is seriously heated during large-current charging is solved, and the charging safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging devices, and in particular to a method for judging the fullness of a rechargeable battery and a charging device. Background Art

[0002] At present, the charging management methods adopted by nickel-metal hydride battery chargers on the market are generally the following: The first is to use timed charging. This method has a small charging current, a long charging time and a low cost, but it is only feasible for a nickel-metal hydride battery of a certain capacity. As the number of cycles of the nickel-metal hydride battery increases, the capacity will decay, which is equivalent to using the previous high-capacity charging time to charge a low-capacity battery. The nickel-metal hydride battery will be in a state of overcharge for a long time. In addition, most timed chargers use multi-slot unified timing, which is equivalent to putting the battery into the charger at the last moment. As long as the timing time is reached, it is also judged as fully charged, causing a great misjudgment. Therefore, this method of timed charging is only barely applicable to the situation where the fixed capacity and the batteries are placed in the charger for charging at the same time. The existing technology has made improvements to this method, such as single-slot timing, but it only solves the problem of inconsistent time when the batteries are put into the charger.

[0003] The second is the current mainstream 0ΔV, -ΔV full judgment method, which is recognized as an intelligent full judgment algorithm for nickel-hydrogen batteries and can achieve high-current charging. Because the battery is independently charged, there is no need to distinguish between the capacity and the time of being put into the charger. However, when the battery appears 0ΔV, -ΔV, it is generally after the battery is fully charged for a period of time before the voltage remains unchanged or negative growth occurs, and the negative pressure is generally 3-5mV. This change is very small, which requires the PCB layout, power supply and signal processing to be very difficult. If there is line interference, external strong magnetic field or electric field interference, it is very likely to cover this weak signal, resulting in the battery voltage remaining unchanged for a long time to determine whether it is fully charged. Therefore, there is also a situation where the battery is in an overcharged state for a relatively long time. Because the charging current is relatively large, the surface temperature of the battery is very high at the time of full judgment. If the software and hardware design is not good, it is easy to cause undercharging or severe overcharging, resulting in severe heating and shortening the battery cycle life.

[0004] Based on the current mainstream 0ΔV, -ΔV fullness judgment method, there is a method of judging fullness by detecting the surface temperature of the battery, or combining temperature with 0ΔV, -ΔV fullness judgment method. This method is costly to implement. When many chargers are working, the charger itself generates a lot of heat. If the temperature probe resistor is placed at the pole piece position (that is, the battery is in contact with the pole piece to indirectly detect the temperature of the battery), if the circuit board itself is very hot, it may cover the temperature of the battery itself and cause false detection. A relatively good approach is to use a temperature detection device under the slot where the battery is placed. This method is costly and complex to assemble. If the battery can have good contact with the sensing device, the battery temperature can be detected relatively accurately. However, due to the inconsistent size of the battery, the contact is not good, resulting in large detection errors. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a more accurate and low-cost method for judging the fullness of a rechargeable battery and a charging device.

[0006] According to the first aspect, an embodiment provides a method for determining fullness of a rechargeable battery, comprising:

[0007] Obtaining an initial battery voltage of the rechargeable battery at a first initial time during a charging process;

[0008] After a first preset time interval, obtaining a current battery voltage of the rechargeable battery at a first current time during the charging process;

[0009] Subtracting the initial battery voltage from the current battery voltage to determine the battery voltage difference; updating the current battery voltage to the initial battery voltage, and continuing to obtain the current battery voltage to update the battery voltage difference;

[0010] The number of times that the battery voltage difference is continuously greater than a preset voltage difference is obtained. When the number is greater than or equal to the preset number, the rechargeable battery is saturated.

[0011] In one embodiment, the obtaining of the number of times that the battery voltage difference is continuously greater than a preset voltage difference, when the number is greater than or equal to the preset number, the rechargeable battery is saturated, includes:

[0012] The last battery voltage difference value among the times is obtained. When the times are greater than or equal to a preset number of times and the last battery voltage difference value is less than a first preset difference value, the rechargeable battery is saturated.

[0013] In one embodiment, the step of obtaining an initial battery voltage of the rechargeable battery at a first initial time during the charging process includes:

[0014] Obtaining a charging curve of the rechargeable battery;

[0015] The time when the slope of the charging curve is greater than the preset slope is defined as the first initial time.

[0016] In one embodiment, the method for determining whether a rechargeable battery is full further comprises:

[0017] When the number is less than a preset number, the power of the rechargeable battery is determined according to the battery voltage difference, wherein when the battery voltage difference is less than a second preset difference, the power of the rechargeable battery is saturated.

[0018] In one embodiment, the method for determining whether a rechargeable battery is full further comprises:

[0019] Obtaining an initial battery temperature of the rechargeable battery at a second initial time during the charging process;

[0020] After a second preset time interval, obtaining a current battery temperature of the rechargeable battery at a second current time during the charging process;

[0021] Subtracting the initial battery temperature from the current battery temperature to determine a battery temperature difference; updating the current battery temperature to the initial battery temperature, and continuing to obtain the current battery temperature to update the battery temperature difference;

[0022] The number of times that the battery temperature difference is continuously greater than the preset temperature difference is obtained. When the number of temperature differences is greater than or equal to the preset number of temperature differences, the rechargeable battery is saturated.

[0023] According to the second aspect, an embodiment provides a charging device, including:

[0024] A timing module, used for setting a first preset time interval;

[0025] a voltage acquisition module, connected to the timing module, for acquiring an initial battery voltage of the rechargeable battery at a first initial time during the charging process, and acquiring a current battery voltage of the rechargeable battery at a first current time during the charging process after a first preset time interval;

[0026] The data processing module is connected to the timing module and the voltage acquisition module, and is used to subtract the initial battery voltage from the current battery voltage to determine the battery voltage difference; update the current battery voltage to the initial battery voltage, and control the voltage acquisition module to continue to obtain the current battery voltage; the data processing module obtains the number of times the battery voltage difference is continuously greater than the preset voltage difference, and when the number is greater than the preset number, the rechargeable battery is saturated.

[0027] In one embodiment, the data processing module obtains the number of times that the battery voltage difference is continuously greater than a preset voltage difference, and when the number is greater than the preset number, the rechargeable battery is saturated, including:

[0028] The data processing module obtains the last battery voltage difference among the times. When the times are greater than or equal to a preset number of times and the last battery voltage difference is less than a first preset difference, the rechargeable battery is saturated.

[0029] In one embodiment, the step of obtaining an initial battery voltage of the rechargeable battery at a first initial time during the charging process includes:

[0030] The data processing module obtains the charging curve of the rechargeable battery;

[0031] The time when the slope of the charging curve is greater than the preset slope is defined as the first initial time.

[0032] In one embodiment, when the data processing module determines that the number is less than a preset number, the data processing module determines the power of the rechargeable battery based on the battery voltage difference, wherein when the battery voltage difference is less than a second preset difference, the power of the rechargeable battery is saturated.

[0033] In one embodiment, the charging device further includes a temperature acquisition module;

[0034] The temperature acquisition module acquires the initial battery temperature of the rechargeable battery at the second initial time during the charging process, and after the second preset time interval set by the timing module, the temperature acquisition module further acquires the current battery temperature of the rechargeable battery at the second current time during the charging process; the data processing module subtracts the initial battery temperature from the current battery temperature to determine the battery temperature difference; updates the current battery temperature to the initial battery temperature, and continues to acquire the current battery temperature to update the battery temperature difference; acquires the number of temperature differences that are continuously greater than the preset temperature difference, and when the temperature difference number is greater than or equal to the preset temperature difference number, the rechargeable battery is saturated with electricity.

[0035] According to the above-mentioned embodiment, a method for judging fullness of a rechargeable battery and a charging device, the method comprises: obtaining the initial battery voltage of the rechargeable battery, obtaining the current battery voltage of the rechargeable battery after a first preset time interval, and subtracting the initial battery voltage from the current battery voltage to determine the battery voltage difference. At the same time, the current battery voltage is updated to the initial battery voltage, and the current battery voltage continues to be obtained to update the battery voltage difference. The number of times the battery voltage difference is greater than the preset voltage difference is obtained, and when the number is greater than or equal to the preset number, the rechargeable battery is saturated. The present application utilizes the battery voltage difference and the number of changes to determine whether the battery is fully charged, so as to control the surface temperature of the rechargeable battery and solve the problem of severe heating of the rechargeable battery when charging with a large current. At the same time, it can also effectively extend the battery cycle life and improve the safety of charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The charging curve of a 2500mAh NiMH battery at 1.0A;

[0037] Figure 2 A flow chart of a method for determining fullness of a rechargeable battery according to an embodiment of the present invention Figure 1 ;

[0038] Figure 3 A flow chart of a method for determining fullness of a rechargeable battery according to an embodiment of the present invention Figure 2 ;

[0039] Figure 4 is a schematic diagram of a charging device according to another embodiment;

[0040] Figure 5 The figure is a curve diagram of battery temperature, battery voltage and ambient temperature of a certain brand of 2500mAh battery at a current of 1.0A in a specific embodiment. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0042] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0043] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0044] Please refer to Figure 1The charging curve of a 2500mAh NiMH battery at 1.0A. Figure 1 It can be seen that as the charging time increases, the battery voltage changes relatively more before the charging is completed. From 2.1 hours to 2.6 hours, the difference in battery voltage change is larger than that before 2.1 hours. At 2.65 hours, the battery is fully charged, and the battery surface temperature is relatively low at this time, which is within an acceptable range. If it is at 2.6 hours, the battery is relatively saturated and the surface temperature will be lower. After 2.65 hours or 2.7 hours, the energy charged into the battery is converted into heat energy and dissipated outward by the battery. At this time, the longer the duration, the higher the battery surface temperature, and finally reaches a stable value. The currently used 0ΔV, -ΔV full judgment method is generated about half an hour after 2.65 hours or 2.7 hours. Therefore, if the charging current is large, such as charging with 1A, and then using the 0ΔV, -ΔV full judgment method to judge fullness, the battery surface temperature will be very hot, which will shorten the battery cycle life, and the battery casing will be burned or other objects, such as the charger shell, will be burned. At the same time, it is also easy to get hot, thereby affecting the user experience.

[0045] The present application uses the change amount and change times of the battery voltage to determine whether the battery is fully charged. If it is determined to be fully charged, charging is stopped, thereby controlling the surface temperature of the battery, solving the problem of serious battery heating during high current charging, and also effectively extending the battery cycle life and improving charging safety. The following is a detailed description.

[0046] Please refer to Figure 2 In one embodiment, a method for determining whether a rechargeable battery is full is provided, comprising the following steps.

[0047] Step S110: obtaining an initial battery voltage of the rechargeable battery at a first initial time during the charging process.

[0048] In one embodiment, when obtaining the initial battery voltage of the rechargeable battery at the first initial time during the charging process, it is necessary to determine the specific value of the first initial time. According to the rechargeable battery calibrated by engineering practice or experiment and the charging process of charging the rechargeable battery, the charging curve of the rechargeable battery can be obtained. According to the analysis of the charging curve of the rechargeable battery, the slope in the second half of the charging curve will be significantly larger. Therefore, the time point when the slope begins to be greater than the preset slope in the entire charging curve is set as the first initial time, and the initial battery voltage of the rechargeable battery at the first initial time is obtained. In one embodiment, the charging process refers to the entire charging process of the rechargeable battery, but there may be current and no current during the charging process. Therefore, as long as it is in the entire charging process of the battery, whether there is current or no current, it belongs to the charging process. In one embodiment, the rechargeable battery is a nickel-hydrogen battery.

[0049] Step S120: obtaining the current battery voltage of the rechargeable battery at the first current time during the charging process.

[0050] In one embodiment, the time after the first preset time interval from the first initial time is the first current time, and the current battery voltage of the rechargeable battery at the first current time during the charging process is obtained.

[0051] Step S130: Subtract the initial battery voltage from the current battery voltage to determine the battery voltage difference.

[0052] In one embodiment, when the initial battery voltage and the current battery voltage are obtained in step S110 and step S120 respectively, the initial battery voltage is subtracted from the current battery voltage to determine the battery voltage difference. At the same time, the current battery voltage is updated to the initial battery voltage, and then the current battery voltage after the first preset time interval is continuously obtained, and the battery voltage difference is recalculated based on the re-acquired current battery voltage and the updated initial battery voltage to update the battery voltage difference. Steps S120 to S130 are repeated to continuously obtain updated battery voltage differences.

[0053] Step S140: Obtain the number of times that the battery voltage difference is continuously greater than a preset voltage difference. When the number is greater than or equal to the preset number, the rechargeable battery is saturated.

[0054] In one embodiment, the obtained battery voltage difference is compared with the preset voltage difference, and the number of times the battery voltage difference is continuously greater than the preset voltage difference is obtained. If the number is greater than or equal to the preset number, it indicates that the rechargeable battery is fully charged and the power is saturated. At this time, according to the actual project situation, the rechargeable battery may be powered off or trickle-charged.

[0055] In one embodiment, when executing step S140, when determining the number of times the battery voltage difference is greater than the preset voltage difference, the last battery voltage difference among the number of times is also obtained. If the number of times is greater than the preset number of times and the last battery voltage difference is less than the first preset difference, it can also indicate that the rechargeable battery is fully charged and saturated. At this time, according to the actual project situation, the rechargeable battery may be powered off or trickle-charged.

[0056] Please refer to Figure 3 A method for determining fullness of a rechargeable battery provided in an embodiment further includes step S150: when the number of times is less than a preset number of times, determining the power of the rechargeable battery according to the battery voltage difference.

[0057] In one embodiment, the number of times the battery voltage difference obtained in step S140 is continuously greater than the preset voltage difference, if during the battery charging process, the number of times is always less than the preset number, whether the power of the rechargeable battery is saturated is determined based on the battery voltage difference, that is, when the battery voltage difference is less than the second preset difference, the power of the rechargeable battery is saturated. At this time, according to the actual engineering situation, the rechargeable battery may be powered off or trickle-charged. It should be noted that the first preset difference and the second preset difference may be the same value or different values ​​according to engineering practice.

[0058] In one embodiment, a method for judging fullness of a rechargeable battery provided by the present application can also obtain the initial battery temperature of the rechargeable battery at the second initial time during the charging process, and after a second preset time interval, obtain the current battery temperature of the rechargeable battery at the second current time during the charging process. The initial battery temperature is subtracted from the current battery temperature to determine the battery temperature difference, and the current battery temperature is updated to the initial battery temperature, and the current battery temperature is continuously obtained to update the battery temperature difference. Finally, the number of temperature differences that are continuously greater than the preset temperature difference is obtained. When the number of temperature differences is greater than or equal to the preset number of temperature differences, it indicates that the rechargeable battery is saturated. It should be noted that when obtaining the initial battery temperature of the rechargeable battery at the second initial time during the charging process, the specific value of the second initial time needs to be determined. According to the rechargeable battery calibrated in engineering practice or experiment and the charging process of the rechargeable battery, the charging temperature curve of the rechargeable battery can be obtained. According to the analysis of the charging temperature curve of the rechargeable battery, the slope in the second half of the charging temperature curve will be significantly larger. Therefore, the time point when the slope begins to be greater than the preset temperature slope in the entire charging temperature curve is set as the second initial time, and the initial battery temperature of the rechargeable battery at the second initial time is obtained.

[0059] In one embodiment, the first initial time and the second initial time can be set to the same value or different values ​​according to different engineering practices, and the first preset time interval and the second preset time interval are similar and can be set to the same value or different values.

[0060] It should be noted that the method for judging whether a rechargeable battery is fully charged provided in the present application includes two methods of judging whether the rechargeable battery is fully charged by using the battery voltage difference and the battery temperature difference. The two methods can be used alone or in combination, and both methods can realize the judgment of whether the rechargeable battery is fully charged.

[0061] Please refer to Figure 4 Another embodiment provides a charging device 200, including a timing module 210, a voltage acquisition module 220, a data processing module 230 and a temperature acquisition module 240, which will be described in detail below.

[0062] In one embodiment, the timing module 210 is used to set a preset first time interval.

[0063] In one embodiment, the voltage acquisition module 220 is connected to the timing module to obtain the initial battery voltage of the rechargeable battery at the first initial time during the charging process, and at the same time, after a first preset time interval set by the timing module 210, obtain the current battery voltage of the rechargeable battery at the first current time during the charging process.

[0064] In one embodiment, when obtaining the initial battery voltage of the rechargeable battery at the first initial time during the charging process, it is necessary to determine the specific value of the first initial time. According to the rechargeable battery calibrated by engineering practice or experiment and the charging process of charging the rechargeable battery, the charging curve of the rechargeable battery can be obtained. According to the analysis of the charging curve of the rechargeable battery, the slope in the second half of the charging curve will be significantly larger. Therefore, the time point when the slope begins to be greater than the preset value in the entire charging curve is set as the first initial time, and the initial battery voltage of the rechargeable battery at the first initial time is obtained. In one embodiment, the charging process refers to the entire charging process of the rechargeable battery, but there may be current and no current during the charging process. Therefore, as long as it is in the entire charging process of the battery, whether there is current or no current, it belongs to the charging process. In one embodiment, the rechargeable battery is a nickel-hydrogen battery.

[0065] In one embodiment, the data processing module 230 is connected to the timing module 210 and the voltage acquisition module 220. The data processing module 230 subtracts the initial battery voltage from the current battery voltage to determine the battery voltage difference. At the same time, the data processing module 230 updates the current battery voltage to the initial battery voltage, and controls the voltage acquisition module 220 to continue to acquire the current battery voltage. That is, based on the acquired initial battery voltage and the current battery voltage, the initial battery voltage is subtracted from the current battery voltage to determine the battery voltage difference. At the same time, the current battery voltage is updated to the initial battery voltage, and the current battery voltage after the first preset time interval is continued to be acquired, and the battery voltage difference is recalculated based on the re-acquired current battery voltage and the updated initial voltage difference to update the battery voltage difference. Repeat the above process to continuously acquire updated battery voltage differences.

[0066] In one embodiment, the data processing module 230 also obtains the number of times that the battery voltage difference is continuously greater than the preset voltage difference. When the number is greater than the preset number, the rechargeable battery is saturated. At this time, the charging device 200 needs to cut off the power to the rechargeable battery or trickle charge the rechargeable battery.

[0067] In one embodiment, when the data processing module 230 determines the number of times that the battery voltage difference is greater than the preset voltage difference, it also obtains the last battery voltage difference among the times. If the number is greater than the preset number and the last battery voltage difference is less than the first preset difference, it can also indicate that the rechargeable battery is fully charged and saturated. At this time, according to the actual project situation, the rechargeable battery may be powered off or trickle-charged.

[0068] In one embodiment, if during the battery charging process, the data processing module 230 determines that the number of times the acquired battery voltage difference is continuously greater than the preset voltage difference is less than the preset number of times, it determines whether the power of the rechargeable battery is saturated based on the battery voltage difference, that is, when the battery voltage difference is less than the second preset difference, the power of the rechargeable battery is saturated. At this time, according to the actual engineering situation, the rechargeable battery may be powered off or trickle-charged. It should be noted that the first preset difference and the second preset difference may be the same value or different values ​​according to engineering practice.

[0069] In one embodiment, the temperature acquisition module 240 obtains the initial battery temperature of the rechargeable battery at the second initial time during the charging process, and after the second preset time interval set by the timing module, the temperature acquisition module 240 also obtains the current battery temperature of the rechargeable battery at the second current time during the charging process. The data processing module 230 subtracts the initial battery temperature from the current battery temperature to determine the battery temperature difference, and simultaneously updates the current battery temperature to the initial battery temperature, and continues to obtain the current battery temperature to update the battery temperature difference. The data processing module 230 obtains the number of temperature differences when the battery temperature difference is continuously greater than the preset temperature difference. When the number of temperature differences is greater than or equal to the preset number of temperature differences, it indicates that the rechargeable battery is saturated. It should be noted that when obtaining the initial battery temperature of the rechargeable battery at the second initial time during the charging process, it is necessary to determine the specific value of the second initial time. According to the experimentally calibrated rechargeable battery and the charging process of the rechargeable battery, a charging temperature curve of the rechargeable battery can be obtained. According to the analysis of the charging temperature curve of the rechargeable battery, the slope in the second half of the charging temperature curve will be significantly larger. Therefore, the time point when the slope of the entire charging temperature curve begins to be greater than the preset temperature slope is set as the second initial time, and the initial battery temperature of the rechargeable battery at the second initial time is obtained.

[0070] In one embodiment, the first initial time and the second initial time can be set to the same value or different values ​​according to different engineering practices, and the first preset time interval and the second preset time interval are similar and can be set to the same value or different values.

[0071] This application provides a specific embodiment to illustrate the advantages of this technical solution:

[0072] Please refer to Figure 5 This is a graph of battery temperature, battery voltage, and ambient temperature for a certain brand of 2500mAh battery at 1.0A current. Figure 5 It can be obtained that the battery voltage generates -ΔV after 2.7 hours. The existing -ΔV full judgment method is to judge the battery full during 2.9 hours to 3.0 hours. At this time, the battery temperature is as high as 45°C or above, which will shorten the battery cycle life. The first initial time in the full judgment method provided by this application is 1.8 hours, that is, the initial battery voltage and the current battery voltage of the battery are obtained from 1.8 hours to determine the battery voltage difference, and the number of times the battery voltage difference is continuously greater than the preset voltage difference is obtained. When the number is greater than the preset number, the rechargeable battery is saturated. The method provided by this application can complete the battery full judgment in 2.6 hours to 2.7 hours. At this time, the battery temperature is only 37.5°C. In addition to the short charging time, this application also tries to make the battery just full but not overcharged as much as possible, thereby extending the battery cycle life.

[0073] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above-mentioned embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to implement the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above-mentioned functions can be implemented. In addition, when all or part of the functions in the above-mentioned embodiments are implemented by computer programs, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash disk or mobile hard disk, and can be downloaded or copied and saved in the memory of the local device, or the system of the local device is updated, and when the program in the memory is executed by the processor, all or part of the functions in the above-mentioned embodiments can be implemented.

[0074] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for determining fullness of a rechargeable battery, characterized in that: include: Obtaining an initial battery voltage of the rechargeable battery at a first initial time during a charging process; After a first preset time interval, obtaining a current battery voltage of the rechargeable battery at a first current time during the charging process; Subtracting the initial battery voltage from the current battery voltage to determine the battery voltage difference; updating the current battery voltage to the initial battery voltage, and continuing to obtain the current battery voltage to update the battery voltage difference; The number of times that the battery voltage difference is continuously greater than a preset voltage difference is obtained. When the number is greater than or equal to the preset number, the rechargeable battery is saturated.

2. The method for determining fullness of a rechargeable battery as claimed in claim 1, wherein: The acquiring the number of times that the battery voltage difference is continuously greater than the preset voltage difference, and when the number is greater than or equal to the preset number, the rechargeable battery is saturated, includes: The last battery voltage difference value among the times is obtained. When the times are greater than or equal to a preset number of times and the last battery voltage difference value is less than a first preset difference value, the rechargeable battery is saturated.

3. The method for determining fullness of a rechargeable battery as claimed in claim 1, wherein: The step of obtaining an initial battery voltage of the rechargeable battery at a first initial time during the charging process includes: Obtaining a charging curve of the rechargeable battery; The time when the slope of the charging curve is greater than the preset slope is defined as the first initial time.

4. The method for determining fullness of a rechargeable battery as claimed in claim 1, wherein: The method for judging fullness of the rechargeable battery also includes: When the number is less than a preset number, the power of the rechargeable battery is determined according to the battery voltage difference, wherein when the battery voltage difference is less than a second preset difference, the power of the rechargeable battery is saturated.

5. The method for determining fullness of a rechargeable battery as claimed in claim 1, wherein: The method for judging fullness of the rechargeable battery also includes: Obtaining an initial battery temperature of the rechargeable battery at a second initial time during the charging process; After a second preset time interval, obtaining a current battery temperature of the rechargeable battery at a second current time during the charging process; Subtracting the initial battery temperature from the current battery temperature to determine a battery temperature difference; updating the current battery temperature to the initial battery temperature, and continuing to obtain the current battery temperature to update the battery temperature difference; The number of times that the battery temperature difference is continuously greater than the preset temperature difference is obtained. When the number of temperature differences is greater than or equal to the preset number of temperature differences, the rechargeable battery is saturated.

6. A charging device, characterized in that: include: A timing module, used for setting a first preset time interval; a voltage acquisition module, connected to the timing module, for acquiring an initial battery voltage of the rechargeable battery at a first initial time during the charging process, and acquiring a current battery voltage of the rechargeable battery at a first current time during the charging process after a first preset time interval; The data processing module is connected to the timing module and the voltage acquisition module, and is used to subtract the initial battery voltage from the current battery voltage to determine the battery voltage difference; update the current battery voltage to the initial battery voltage, and control the voltage acquisition module to continue to obtain the current battery voltage; the data processing module obtains the number of times the battery voltage difference is continuously greater than the preset voltage difference, and when the number is greater than the preset number, the rechargeable battery is saturated.

7. The charging device according to claim 6, characterized in that: The data processing module acquires the number of times that the battery voltage difference is continuously greater than the preset voltage difference, and when the number is greater than the preset number, the rechargeable battery is saturated, including: The data processing module obtains the last battery voltage difference among the times. When the times are greater than or equal to a preset number of times and the last battery voltage difference is less than a first preset difference, the rechargeable battery is saturated.

8. The charging device according to claim 6, characterized in that: The step of obtaining an initial battery voltage of the rechargeable battery at a first initial time during the charging process includes: The data processing module obtains the charging curve of the rechargeable battery; The time when the slope of the charging curve is greater than the preset slope is defined as the first initial time.

9. The charging device according to claim 6, characterized in that: When the data processing module determines that the number is less than the preset number, the data processing module determines the power of the rechargeable battery according to the battery voltage difference, wherein when the battery voltage difference is less than a second preset difference, the power of the rechargeable battery is saturated.

10. The charging device according to claim 6, characterized in that: The charging device also includes a temperature acquisition module; The temperature acquisition module acquires an initial battery temperature of the rechargeable battery at a second initial time during the charging process, and after a second preset time interval set by the timing module, the temperature acquisition module further acquires a current battery temperature of the rechargeable battery at a second current time during the charging process; The data processing module subtracts the initial battery temperature from the current battery temperature to determine the battery temperature difference; updates the current battery temperature to the initial battery temperature, and continues to obtain the current battery temperature to update the battery temperature difference; The number of times that the battery temperature difference is continuously greater than the preset temperature difference is obtained. When the number of temperature differences is greater than or equal to the preset number of temperature differences, the rechargeable battery is saturated.

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