A multi-battery charging method, system, device, charging / swapping cabinet and storage medium

Abstract

The present invention discloses a multi-battery charging method, system, device, charging / battery swapping cabinet, and storage medium, belonging to the field of batteries. The multi-battery charging method includes the following steps: obtaining the cell temperature of each battery in the battery to be charged and screening out rechargeable batteries; calculating and checking whether there is currently available charging power, scanning the SOC value of the rechargeable battery; judging whether the SOC value of the battery is within the interval [SOC1, SOC2); sorting the batteries with SOC values of [SOC1, SOC2) according to the SOC values of the batteries and charging them in sequence; using the remaining available charging power to charge batteries with SOC values less than SOC1; charging batteries with SOC values greater than or equal to SOC2 with a small current until the battery is fully charged. The present invention solves the problems of low charging efficiency, low battery turnover rate, and high requirements for the implementation of charging / battery swapping cabinets in existing technologies.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a multi-battery charging method, system, device, charging / swapping cabinet, and storage medium. Background Art

[0002] At present, in addition to traditional charging piles, electric power bicycle battery charging systems also have charging / battery swapping cabinets for charging lithium batteries. Traditional charging piles usually need to be installed in fixed places to obtain sufficient power. Compared with charging piles, this type of charging / battery swapping cabinet can charge at least 8 lithium batteries, such as 8, 12, or 16 lithium batteries. In addition, lithium battery charging / battery swapping cabinets will be vigorously developed due to their small size, flexible layout, and unlimited site.

[0003] However, the large-scale integration of charging / swapping cabinets into the distribution network has also brought challenges to the distribution system. Due to the different power distribution networks at different locations, the power input to the charging / swapping cabinets will also vary. When charging multiple batteries, existing charging / swapping cabinets generally use a constant current or constant voltage charging method to charge different batteries simultaneously. When the power supply is affected, the charging / swapping cabinet cannot receive sufficient input power, which affects charging efficiency. If charging is still carried out according to the original charging method, the charging time of each battery will be extended. For example, a charging / swapping cabinet can charge 16 lithium batteries simultaneously. Theoretically, the charging system can provide a maximum output power of 8kW. However, due to the power distribution system, the actual input power available is only 3.5kW. Charging according to the constant current or constant voltage charging method has to limit the charging power of each battery, and some batteries may even not be able to charge. As a result, the charging time of each battery will be extended due to the limited input power, affecting the efficiency of the charging / swapping cabinet and reducing the battery turnover rate. Correspondingly, the implementation requirements of the charging / swapping cabinet will also be increased.

[0004] Therefore, technicians in this field are committed to developing a multi-battery charging method, system, device, charging / swapping cabinet and storage medium to solve the problems existing in the prior art. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the present invention aims to solve the problems of low charging efficiency, low battery turnover rate and high requirements for the implementation of charging / battery swapping cabinets in the prior art.

[0006] To achieve the above object, the present invention provides a multi-battery charging method, comprising the following steps:

[0007] S1. Obtaining the cell temperature of each battery in the batteries to be charged, pre-processing the batteries to be charged according to the cell temperature, and screening out rechargeable batteries;

[0008] S2. Calculate and check whether there is currently available charging power. If so, scan the SOC value of the rechargeable battery;

[0009] S3, determining whether the SOC value is within the range [SOC1, SOC2), if so, executing step S4, if not, executing step S5;

[0010] S4. Arrange the charging order of the rechargeable batteries according to the SOC values from large to small, distribute the charging current according to the charging order, charge the rechargeable batteries, and execute step S1;

[0011] S5, determining whether the SOC value is less than SOC1, if so, executing step S6, if not, executing step S7;

[0012] S6. Using the remaining available charging power to charge the rechargeable battery whose SOC value is less than SOC1, and executing step S1;

[0013] S7. Charge the rechargeable battery with a low current until the battery is fully charged.

[0014] Preferably, step S1 specifically includes:

[0015] Determining a charging priority level of the battery to be charged according to the battery core temperature, the charging priority level including low charging priority, medium charging priority and high charging priority;

[0016] When the charging priority is low, the battery to be charged is not charged;

[0017] When the charging priority level is medium, the battery to be charged is charged with a low current until the charging priority level is high;

[0018] When the charging priority is high, the battery to be charged is the rechargeable battery.

[0019] More preferably,

[0020] The priority coefficient f(t) of the battery to be charged is obtained according to the following formula:

[0021]

[0022] Wherein, Tbt is the battery cell temperature;

[0023] The value of the priority coefficient f(t) is in the range of [0, f1), which belongs to low charging priority;

[0024] The value of the priority coefficient f(t) is in the range [f1, f2), which belongs to the medium charging priority;

[0025] The value of the priority coefficient f(t) is in the range of [f2, 1], which belongs to high charging priority.

[0026] Optionally, the available charging power is obtained by the following formula:

[0027]

[0028] Where, P o(sys) is the available charging power; P in(sys) is the input power, is the total charging power consumed by the rechargeable batteries currently being charged, n is the number of rechargeable batteries being charged, P (other) For other power consumption.

[0029] More preferably, the input power satisfies the following formula:

[0030]

[0031] Among them, P in(sys) is the input power; is the sum of the charging powers of the rechargeable batteries when all the rechargeable batteries are charged at the maximum current; m is the number of rechargeable batteries that can be accommodated.

[0032] Optionally, step S4 specifically includes:

[0033] S41, arranging the charging order of the rechargeable batteries from large to small according to the SOC values;

[0034] S42, allocating a maximum charging current to the rechargeable battery with the highest SOC value, and allocating a maximum charging current to the remaining rechargeable batteries in descending order of charge according to currently available charging power;

[0035] S43, when the SOC value ≥ SOC2, charging is performed according to step S7;

[0036] S44: Repeat step S41 for the remaining rechargeable batteries to charge.

[0037] Optionally, step S6 specifically includes:

[0038] S611. Calculate the remaining available charging power.

[0039] S612, calculating the sum of the powers of all the rechargeable batteries with SOC values in the interval (0, SOC1) when charged at the maximum charging current, and determining whether the remaining available charging power is greater than the sum of the powers; if so, executing step S613; if not, executing step S614;

[0040] S613, performing maximum current charging on all the rechargeable batteries whose SOC values are within the interval (0, SOC1), and executing step S1;

[0041] S614. Sort all the rechargeable batteries whose SOC values are in the interval (0, SOC1) in ascending order according to the SOC values, select the first k rechargeable batteries for maximum current charging, and charge the remaining rechargeable batteries according to a current that evenly distributes the remaining available charging power, and execute step S1.

[0042] More preferably, the k is obtained by dichotomy.

[0043] More preferably, the k is the amount of the remaining available charging power that can simultaneously satisfy the charging of the rechargeable battery at the maximum current.

[0044] Optionally, when the SOC values in step S3 are all in the interval (0, SOC1), step S6 specifically includes:

[0045] S621, determining whether the available charging power at this time is sufficient to charge each rechargeable battery at the maximum current; if so, executing step S622; if not, executing step S623;

[0046] S622, all rechargeable batteries are charged at a maximum current, where the maximum current is the maximum current required by the battery or the maximum current that the charger can output, and step S1 is executed;

[0047] S623, sorting the rechargeable batteries in descending order of the SOC values;

[0048] S624. Charge the first half of the rechargeable batteries with a current that is evenly distributed to 2 / 3 of the available charging power, and charge the second half of the rechargeable batteries with a current that is evenly distributed to the remaining 1 / 3 of the available charging power, and execute step S1.

[0049] Optionally, the small current in step S7 is a current less than or equal to 0.3C.

[0050] In a preferred embodiment of the present invention, a multi-battery charging system is provided to implement the multi-battery charging method described above, comprising:

[0051] a temperature priority evaluation module, which obtains the cell temperature of each battery in the battery to be charged, pre-processes the battery to be charged according to the cell temperature, and screens out rechargeable batteries;

[0052] The power detection and SOC scanning module calculates and checks whether the current system has available charging power. If so, it scans the SOC value of the rechargeable battery;

[0053] A first determination module determines whether the SOC value is within the range [SOC1, SOC2), and if so, executes the first charging module; if not, executes the second determination module;

[0054] a first charging module, arranged in descending order of the charging sequence of the rechargeable batteries according to the SOC values, allocated charging current according to the charging sequence, charged the rechargeable batteries, and executed a temperature priority evaluation module;

[0055] A second determination module determines whether the SOC value is less than SOC1, and if so, executes the second charging module; if not, executes the third charging module;

[0056] a second charging module, charging the rechargeable battery having an SOC value less than SOC1 using the remaining available charging power, and executing a temperature priority evaluation module;

[0057] The third charging module charges the rechargeable battery with a small current until the battery is fully charged.

[0058] Another preferred embodiment of the present invention provides a multi-battery charging device, comprising:

[0059] A processor configured to execute the steps of the multi-battery charging method of the present invention by executing executable instructions;

[0060] A memory is used to store executable instructions of the processor.

[0061] In another preferred embodiment of the present invention, a charging / swapping cabinet is provided, comprising a control terminal, wherein the control terminal comprises the multi-battery charging device described above in the present invention.

[0062] In another preferred embodiment of the present invention, a computer-readable storage medium is provided for storing a program, wherein when the program is executed, the steps of the multi-battery charging method described above are implemented.

[0063] The multi-battery charging method, system, device, charging / swapping cabinet, and storage medium provided by the present invention have the following technical effects:

[0064] 1. The multi-battery charging method of the present invention performs the first step of priority screening by temperature, and then dynamically distributes the charging current to the rechargeable batteries based on the available charging power and the SOC values of different batteries. Different charging currents are provided to different batteries during the multi-battery charging process, and the charging currents of different batteries are adjusted during each stage of the charging process. That is, through the multi-battery charging method with constant power input and dynamic power output, the battery charging time is shortened and the battery turnover rate is improved.

[0065] 2. The charging system, charging device, charging / battery swapping cabinet, and medium of the present invention allocate different available charging powers to different batteries by executing the multi-battery charging method of the present invention, thereby improving the charging efficiency of the battery charging / battery swapping system.

[0066] 3. The charging / battery swapping cabinet of the present invention can realize fast charging of the battery even when the input power is limited by executing the multi-battery charging method with constant power input and dynamic power output of the present invention, thereby reducing the requirements for the power system, and thus reducing the rigid restrictions on the installation location of the charging / battery swapping cabinet, reducing the requirements for the implementation of the charging / battery swapping cabinet, and improving the wide practicality of the charging / battery swapping cabinet.

[0067] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a flow chart of a preferred embodiment of a multi-battery charging method of the present invention;

[0069] Figure 2 1 is a flow chart of a preferred embodiment of step S4 of a multi-battery charging method of the present invention;

[0070] Figure 3 1 is a flow chart of a preferred embodiment of step S6 of a multi-battery charging method of the present invention;

[0071] Figure 4 1 is a flow chart of another preferred embodiment of step S6 of a multi-battery charging method of the present invention;

[0072] Figure 5 1 is a schematic structural diagram of a preferred embodiment of a multi-battery charging system of the present invention;

[0073] Figure 6 It is a structural schematic diagram of a preferred embodiment of a multi-battery charging device of the present invention;

[0074] Figure 7 This is a structural principle diagram of a preferred embodiment of the charging / swapping cabinet of the present invention;

[0075] Figure 8 This is a schematic diagram of the structure of multiple charging / swapping cabinets in one area according to a preferred embodiment of the present invention;

[0076] Figure 9 This is a schematic diagram of the structure of multiple charging / swapping cabinets in one area according to another preferred embodiment of the present invention;

[0077] Figure 10This is a priority coefficient curve diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0078] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0079] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0080] While some exemplary embodiments of the present invention have been described for purposes of illustration, it should be understood that the present invention may be implemented in other ways not specifically shown in the drawings.

[0081] like Figure 1 To achieve the above-mentioned purpose, the present invention provides a multi-battery charging method, comprising the following steps:

[0082] S1. Obtaining the cell temperature of each battery in the batteries to be charged, pre-processing the batteries to be charged according to the cell temperature, and screening out rechargeable batteries;

[0083] The battery cell temperature is an important indicator of the battery. During the charging process, excessively high or low battery cell temperatures will cause great safety hazards. Therefore, in this embodiment, the battery cell temperature is taken as the most prioritized factor. In this embodiment, the battery cell temperature of the battery to be charged is first detected to screen out which batteries can be charged and which batteries cannot be charged. For the rechargeable batteries, further judgment is made to determine the current to be used to charge the battery to be charged. Commonly used lithium batteries such as ternary lithium batteries and lithium iron phosphate batteries have a safe charging temperature Tbt range of 0≤Tbt≤50℃.

[0084] The pre-processing process in step S1 specifically includes:

[0085] Determining a charging priority level of the battery to be charged according to the battery core temperature, the charging priority level including low charging priority, medium charging priority and high charging priority;

[0086] The battery cell temperature is used to obtain the priority coefficient f(t) of the battery according to the following formula:

[0087]

[0088] Wherein, Tbt is the battery cell temperature;

[0089] This embodiment calculates the priority coefficient based on the battery cell temperature, and determines the charging priority of the battery according to the interval of the priority coefficient. The charging priority can be directly divided according to different temperature thresholds, and the charging priority can be determined directly according to the battery cell temperature.

[0090] Since the battery cell temperature threshold is linear, in order to simplify the implementation method, this embodiment uses a formula for calculating the priority coefficient, obtains the determination coefficient of the battery cell temperature according to the priority coefficient formula, and coefficientizes the temperature range through a normal distribution curve to realize the determination of charging priority.

[0091] Batteries to be charged whose priority coefficient f(t) is in the range of [0, f1) are of low charging priority. When the priority is low, the batteries to be charged of this charging priority are not charged.

[0092] The battery to be charged whose priority coefficient f(t) is within the range of [f1, f2) is of medium charging priority. When it is of medium charging priority, the battery to be charged with this charging priority is charged with a low current until it reaches a high charging priority.

[0093] The battery to be charged whose priority coefficient f(t) value is in the range of [f2, 1] has a high charging priority. When it has a high charging priority, the battery to be charged with this charging priority is the rechargeable battery.

[0094] In the field of batteries, the best temperature condition for batteries is 25°C. The priority temperature range is obtained according to the priority coefficient formula. The closer the battery cell temperature is to 25°C, the higher the charging priority of the battery. The curve of the priority coefficient of this embodiment is as follows: Figure 10 As shown, the horizontal axis of the curve is the battery cell temperature, and the vertical axis of the curve is the priority coefficient value. Figure 10 In this embodiment, the charging priority coefficient range of low charging priority is [0, 0.2), the charging priority coefficient range of medium charging priority is [0.2, 0.8), and the charging priority coefficient range of high charging priority is [0.8, 1]. Figure 10It can be seen that the battery temperature during the charging priority period is either low or high, and each battery cell has a charging curve at a different temperature. Therefore, when the charging priority coefficient of the battery to be charged is at a medium charging priority, the battery is charged at a low current determined according to the battery cell temperature curve until the charging priority coefficient reaches a high charging priority range, and then step S2 is executed.

[0095] S2. Calculate and check whether there is currently available charging power. If so, scan the SOC value of the rechargeable battery. In this embodiment, the battery X that meets the rechargeable conditions i ={X1, X2, ..., X 16}.

[0096] Current available charging power P o(sys) Determine the charging power that can be allocated to the current rechargeable battery, at input P o(sys) When the maximum charging power of the current rechargeable battery is greater than the maximum current of the current equalized voltage, and the temperature of the current battery core meets the conditions of the rechargeable battery described in step S1, the charger corresponding to the battery charges at the maximum current that the battery can charge, or the maximum current that the charger can output or the current required by the battery is greater than the output capacity of the charger, the total input power P in(sys) Determines the available charging power P o(sys) , the available charging power is obtained by the following formula:

[0097]

[0098] Where, P o(sys) is the available charging power; P in(sys) is the input power, is the total charging power consumed by the rechargeable batteries currently being charged, n is the number of rechargeable batteries being charged, P (other) For other consumed power, the current consumed power in the brackets in the above formula can be obtained by a system input power meter, which can be displayed by a common instrument such as an electric energy meter.

[0099] Excluding the consumed power, in order to allow at least half of the batteries (assuming that the half of the batteries meet the charging conditions) to receive maximum power charging, the input power is greater than or equal to 60% of the total charging power, that is, the input power satisfies the following formula:

[0100]

[0101] Among them, P in(sys) is the input power; The total charging power is the sum of the charging powers of the rechargeable batteries when all the rechargeable batteries are charged at the maximum current; m is the number of rechargeable batteries that can be accommodated, and in this embodiment, m=16;

[0102] S3. Determine whether the battery SOC value is within the range [SOC1, SOC2). If so, proceed to step S4; if not, proceed to step S5.

[0103] The battery SOC is the state of charge of a lithium-ion battery and is an important basis for measuring battery performance. In this embodiment, the value of the battery SOC parameter read is used as a determining factor in determining the priority of obtaining the maximum charging power for multiple batteries being charged simultaneously. The charging current also needs to be adjusted accordingly for different SOC value ranges to obtain the optimal charging strategy.

[0104] When the battery SOC is greater than SOC2, it indicates that the current battery power is relatively sufficient and does not require too many charging resources. If the battery SOC value is less than SOC1, the battery power is low, requiring more charging power and a longer charging time. Batteries with SOC values within the range of [SOC1, SOC2) require relatively less charging time. Therefore, in order to improve the battery turnover rate, batteries within the range of [SOC1, SOC2) are charged first. In this embodiment, the SOC1 value is set to 50% and the SOC2 value is set to 90%. When the SOC value of the rechargeable battery is 90%, the battery is basically fully charged and can be used directly. The smaller the SOC value, the longer the charging time to reach 90%. When the SOC value is 50%, the battery takes more time to reach 90%. The SOC1 value is 50% and the SOC2 value is 90%. That is, this step determines whether the SOC value is within the range of [50%, 90%).

[0105] Rechargeable batteries prioritize determining whether their SOC values are within the range of [50%, 90%), allowing batteries in this range to be charged first. Batteries in this value range can reach 90% faster, which overall reduces the battery charging time and increases the battery's circulation speed. During actual use, the SOC1 and SOC2 values can be adjusted and set according to the specific charging situation.

[0106] S4. Arrange the charging order of the batteries according to the SOC values of the batteries from large to small, distribute the charging current according to the charging order, charge the rechargeable batteries, and execute step S1;

[0107] Specifically in this embodiment, the battery {X1, X5, X 10 , X 11 , X 14 The SOC value range of} is in the range of [50%, 90%). The specific charging method is as follows: Figure 2 As shown, the following steps are included:

[0108] S41. Arrange the charging order of the batteries according to the SOC values of the batteries from large to small; that is, arrange the batteries according to the SOC values from large to small as follows: X 14 , X2, X5, X 10 , X 11 ;

[0109] S42, allocating a maximum charging current to the rechargeable battery with the highest SOC value, and allocating a maximum charging current to the remaining rechargeable batteries in descending order of charge according to currently available charging power;

[0110] In the above-mentioned battery of this embodiment, battery X 14 The SOC value of the battery is the largest, and its corresponding charging priority is the highest, so it is assigned to battery X. 14 Assign the maximum charging current required or the maximum current that the charger corresponding to the battery can output. If there is enough power at this time, charge the battery X2 with a large current. If there is enough power, charge the remaining batteries X5, X 10 , X 11 Then charge according to the above-mentioned decreasing method, according to the current available charging power P o(sys) Get the maximum charging current.

[0111] S43. When the SOC value of the rechargeable battery is ≥90%, the rechargeable battery with the SOC value ≥90% is charged according to the charging method described in step S7;

[0112] S44: Repeat step S41 for the remaining batteries to charge;

[0113] During the charging process, the power of each battery will increase, and the SOC of each battery will gradually increase. The battery X with the largest SOC value and the largest charging current will 14 When the SOC value reaches 90%, the battery X 14 Charge according to the charging method described in step S43, and re-arrange the remaining batteries according to the method of arranging them in descending order according to the SOC values described in step S41, and then execute steps S42 and S43 in sequence to cycle the dynamic current charging of the batteries.

[0114] In order to ensure the safety of the rechargeable battery, the temperature of the battery cell cannot be higher than its safe temperature. Therefore, the temperature of the battery cell must be monitored when the battery is placed in the battery and starts charging and during the charging process. Regardless of the amount of power, the temperature of the battery cell needs to be monitored. Therefore, during the execution of step S4, the temperature of the rechargeable battery cell needs to be monitored in real time, that is, step S1 is executed.

[0115] S5. Determine whether the battery SOC value is less than 50%. If so, proceed to step S6; if not, proceed to step S7.

[0116] S6. Use the remaining available charging power to charge the battery whose SOC value is less than 50%, and execute step S1.

[0117] In the above battery combination, excluding the batteries with SOC values in the interval [50%, 90%), the batteries with SOC values in the interval (0, 50%) are {X2, X3, X4, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X30, X40, X50, X60, X70, X80, X90, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X30, X40, X60, X70, X80, X90, X19, X1 12 , X 13 , X 15 , X 16}, the specific charging process is as follows Figure 3 As shown, the following steps are included:

[0118] S611. Calculate the current remaining available charging power;

[0119] S612. Calculate the sum of the power of all rechargeable batteries with SOC values in the interval (0, 50%) when charged at the maximum charging current, and determine whether the currently remaining available charging power in step S611 is greater than the sum of the power. If so, proceed to step S613; otherwise, proceed to step S614.

[0120] S613, performing maximum current charging on all the rechargeable batteries whose SOC values are within the interval (0, 50%), and executing step S1;

[0121] At this time, the available charging power is sufficient to charge all batteries with SOC values in the interval (0, 50%) as {X2, X3, X4, X6, X7, X8, X 12 , X 13 , X 15 , X 16} is charged with the maximum current, then all rechargeable batteries with SOC values in the interval (0, 50%) are charged with the required maximum current or the maximum current output by the charger, so that the battery completes fast charging; during the charging process, the battery cell temperature changes must be measured in real time to prevent the battery temperature from being too high or too low and to ensure the safety of the battery. The SOC value of the battery during the charging process must also be scanned in real time to achieve true dynamic power output multi-battery charging. Therefore, it is necessary to return to step S1 and re-execute the above process steps. After the batteries in this interval have been continuously charged, if it is monitored through step S3 that the SOC value of a battery reaches the range of [50%, 90%), the battery that has newly reached the range of [50%, 90%) is charged using the charging method described in step S4 to achieve dynamic power distribution of the battery.

[0122] S614. Sort all rechargeable batteries whose SOC values are in the interval (0, 50%) in ascending order according to the SOC values, select the first k batteries for maximum current charging, and charge the remaining batteries with a current that evenly distributes the remaining charging power, and execute step S1.

[0123] When the SOC value of the rechargeable battery is between (0, 50%), the battery power in this value range is low, and the charging time is relatively long. Therefore, while charging the battery in the priority charging range of [50%, 90%), using a larger power to increase the battery power in the (0, 50%) range as quickly as possible can improve the charging efficiency of all rechargeable batteries as a whole, thereby improving the battery turnover rate.

[0124] In one embodiment, the value of k is determined as follows: according to the dichotomy method, the value of k is 1 / 2, that is, the first half of the batteries are charged with the maximum current; when the number of rechargeable batteries is an odd number, the value of k is an integer obtained by dividing the number of batteries in the interval (0, 50%) by 2.

[0125] In another embodiment, the value of k is determined as follows: based on the remaining available charging power, as many batteries as possible are charged at the maximum current first, and the remaining batteries are evenly distributed. At this time, the number of batteries charged at the maximum current is the desired value of k.

[0126] In this embodiment, all rechargeable batteries {X2, X3, X4, X6, X7, X8, X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X30, X40, X60, X70, X80 ... 12 , X 13 , X 15 , X 16} According to the SOC value from small to large, they are arranged in order: X4, X2, X6, X8, X3, X 16 , X7, X 12 , X 15 , X 13 ; Select the first five batteries, namely X4, X2, X6, X8 and X3, and charge them with the maximum current required by each battery or the maximum current output by the corresponding charger. 16 , X7, X 12 , X 15 , X 13Charging is performed according to a current that evenly distributes the remaining charging power. During the charging process, the temperature of the battery cells of each battery also needs to be monitored, and the SOC value of each battery also needs to be scanned in real time. Therefore, it is necessary to return to step S1 and re-execute the above process steps. When the batteries in this interval are continuously charged, if it is monitored in step S3 that the SOC value of a battery reaches the range of [50%, 90%), the battery that has newly reached the range of [50%, 90%) is charged using the charging method described in step S4 to achieve dynamic power distribution of the batteries.

[0127] When the SOC values of the rechargeable battery in step S3 are all within the range of (0, 50%), the charging method in step S6 is as follows: Figure 4 As shown, the following steps are included:

[0128] S621: Determine whether the available charging power at this time is sufficient to charge each battery at the maximum current. If so, proceed to step S622; if not, proceed to step S623.

[0129] S622, all rechargeable batteries are charged at a maximum current, where the maximum current is the maximum current required by the battery or the maximum current that the charger can output, and step S1 is executed;

[0130] S623, sorting the rechargeable batteries in descending order of the SOC values;

[0131] S624, charging the first half of the rechargeable batteries with a current that is evenly distributed at 2 / 3 of the available charging power, and charging the second half of the rechargeable batteries with a current that is evenly distributed at the remaining 1 / 3 of the available charging power, and executing step S1;

[0132] Among all the rechargeable batteries, when the SOC value of a battery is between [50%, 90%), this part of the batteries is charged according to steps S611-S614. This part of the batteries occupies most of the electrical energy. When the charging power is limited, all the remaining rechargeable batteries cannot obtain high power. Therefore, the power level of the battery with the lowest power level is generally increased to the second highest power level at a faster rate, while the power level of the battery with the second highest power level is also increased. Under the condition of limited power, when the SOC value of all rechargeable batteries is less than 50%, all rechargeable batteries are charged, and the charging efficiency is not high. Therefore, a binary method is used to give more charging power to 1 / 2 of the batteries with higher power levels, so that the power of these batteries quickly reaches above 50%. At the same time, the power of other batteries is also increased, but the speed may be slower. The batteries above 50% are charged with the highest current, and the rest are redistributed according to steps S623-S624 until half of them quickly reach 90% power.

[0133] During the charging process, it is also necessary to monitor the cell temperature of each battery and scan the SOC value of each battery in real time. Therefore, it is necessary to return to step S1 and re-execute the above process steps. When the batteries in this interval are continuously charged, if it is monitored in step S3 that the SOC value of a battery reaches the range of [50%, 90%), the battery that has newly reached the range of [50%, 90%) is charged using the charging method described in step S4.

[0134] S7. Charge the rechargeable battery with a low current until the battery is fully charged. At this time, the SOC value of the battery is ≥90%, and the battery can be treated as fully charged. It does not need to occupy too many resources before reaching the true full charge. Therefore, a small current is used to slowly charge the battery. Usually, the charging current for slow charging of the battery is selected to be 0.2C, 0.3C, etc. This value can be flexibly selected according to factors such as available charging power and battery cell temperature. In this embodiment, the current selected is 0.3C constant current charging until the battery is fully charged, completing the charging of the battery.

[0135] In the actual implementation process, the order of steps S3 to S7 can be adjusted as needed, the purpose is to combine the battery SOC, rated input power P in(sys) , Current available charging power P o(sys) The sum of the charging power consumed by the rechargeable battery currently being charged Dynamically adjust and distribute the charging current of each battery to maximize the battery charging efficiency under limited input power.

[0136] The maximum current in the maximum current charging described in this embodiment is the maximum current required by the rechargeable battery or the maximum current that the charger can output.

[0137] like Figure 5 As shown, a preferred embodiment of the present invention provides a multi-battery charging system for implementing the multi-battery charging method of the present invention, comprising:

[0138] like Figure 5 As shown, a preferred embodiment of the present invention provides a multi-battery charging system for implementing the multi-battery charging method of the present invention, comprising:

[0139] The temperature priority evaluation module 100 obtains the cell temperature information of each battery in the battery to be charged, pre-processes the battery to be charged according to the cell temperature, and selects the rechargeable batteries;

[0140] The cell temperature of the battery to be charged can be obtained through a battery temperature sensor, or the cell temperature information of the battery can be obtained through a temperature detection device integrated on the battery. The temperature priority evaluation module pre-stores a number of battery temperature thresholds, and uses the battery priority coefficient formula to calculate the priority coefficient of each battery to determine the charging priority of the battery. When the battery to be charged belongs to a high charging priority, the power detection and SOC scanning module is executed. If the battery meets the medium charging priority, the battery of this level is charged with a small current until the priority coefficient of the battery meets the high charging priority. The power detection and SOC scanning module are executed. For batteries that do not meet any of the requirements, charging is not performed. The specific range of the priority coefficient and the calculation method in this embodiment are as described in step S1 of the multi-battery charging method in this embodiment.

[0141] The power detection and SOC scanning module 200 calculates and checks whether there is currently available charging power, and if so, scans the SOC value of the rechargeable battery;

[0142] The first determination module 300 determines whether the battery SOC value is within the range of [50%, 90%). If so, the first charging module is executed; if not, the second determination module is executed;

[0143] The first charging module 400 arranges the charging order of the batteries according to the SOC values of the batteries from large to small, distributes the charging current to charge the rechargeable batteries according to the charging order, and executes the temperature priority evaluation module;

[0144] The second determination module 500 determines whether the SOC value of the battery is less than 50%. If so, the second charging module is executed; if not, the third charging module is executed;

[0145] The second charging module 600 uses the remaining available charging power to charge the battery with an SOC value less than 50%, and executes the temperature priority evaluation module.

[0146] The third charging module 700 charges the rechargeable battery with a low current until the battery is fully charged.

[0147] The specific working processes of the first determination module, the first charging module, the second determination module, the second charging module, and the third charging module are described in steps S3 to S7 of a multi-battery charging method and are not further described here. Each of the above modules can be a different software program to implement the corresponding function of each module.

[0148] like Figure 6 As shown, another preferred embodiment of the present invention provides a multi-battery charging device, including a processor and a memory, specifically:

[0149] The processor is configured to execute the executable instructions to perform the steps of the multi-battery charging method of the present invention;

[0150] The memory is used to store executable instructions of the processor.

[0151] The memory in this embodiment may be a readable medium in the form of volatile storage, such as a random access memory unit and / or a cache memory, or may be a read-only memory.

[0152] The steps of the multi-battery charging method described in the embodiments of the present invention may be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. The software module may reside in RAM, flash memory, ROM, EPROM, registers, a hard disk, a removable hard disk, or any other storage medium known in the art. The memory and processor may be coupled to enable the processor to read and write information from / to the memory; the memory may also be integrated into the processor in the form of a software module.

[0153] like Figure 7 As mentioned above, in another preferred embodiment of the present invention, a charging / battery swapping cabinet is provided, which includes several chargers and a control terminal, and the control terminal includes a multi-battery charging device as described above in the present invention.

[0154] In this embodiment, the charging cabinet can accommodate 16 rechargeable batteries. When the charging cabinet is configured, its input power meets the following requirements:

[0155]

[0156] Among them, P in(sys) is the input power; When all rechargeable batteries that can be accommodated are charged at the maximum current, the sum of the charging powers of each rechargeable battery, that is, the total charging power of the system; m is the number of rechargeable batteries that can be accommodated, which is 16 in this embodiment. In this embodiment, the input power is greater than or equal to 60% of the total charging power. If the input power is less, the number of batteries that can be charged at the same time is less, and if the input power is more, the number of batteries that can be charged at the same time is more. Since the current civilian electricity can usually provide power that can usually reach the maximum standard of 16A and 3500W, many times due to the limitations of the surrounding power consumption, it is not possible to meet the current landing requirements of the charging / battery swapping cabinet. This application reduces the input power requirement. As long as it meets the requirement of being greater than or equal to 60% of the total charging power, the charging method of this application can also achieve efficient charging of multiple batteries, and has a good battery turnover rate, and the application scenarios are more extensive.

[0157] In a specific embodiment, each charging / swapping cabinet is provided with a control terminal, which may be a built-in computer, a remote control service terminal, or a mobile control terminal, etc., for controlling the charging / swapping cabinet.

[0158] The processor and memory in the above-mentioned multi-battery charging device are integrated into the control terminal in a hardware manner, or are both loaded into the control terminal in the form of program code, or the multi-battery charging method described in the embodiment of the present invention is implemented in a combination of software and hardware. When the multi-battery charging device is presented in the form of a software product, the program product can be directly loaded into the control terminal in the existing charging / swapping cabinet.

[0159] In the specific implementation process, a control terminal can be used to simultaneously control the charging process of multiple charging / battery swapping cabinets in an area. This application adopts a multi-battery charging method with dynamic power output, which reduces the requirements for the landing of the charging / battery swapping cabinet and improves the battery turnover efficiency. Then the location of the charging / battery swapping cabinet will be more flexible. In order to meet the needs of users, the installation location of the charging / battery swapping cabinet can be divided into several control areas according to a certain rule. The division rule can be based on administrative regions, geographical locations, control distances, etc. The charging / battery swapping cabinet and the control terminal establish a communication connection through a wireless network.

[0160] In a specific embodiment, the control terminal can be integrated into one of the charging / swapping cabinets. The charging / swapping cabinet is defined as the main cabinet, and the other charging / swapping cabinets in the area are sub-cabinets. The main cabinet and the sub-cabinet are respectively provided with a communication device. The main cabinet sends charging control instructions and receives power and charging status information of the sub-cabinet through the communication device. Correspondingly, the sub-cabinet receives control instructions and sends power and charging status information through the communication device. The principle diagram is shown as follows. Figure 8 As shown;

[0161] like Figure 9 As shown, in another specific embodiment, the control terminal may also be a remote control terminal, and the charging / battery swapping cabinets in the area are respectively controlled by the remote control terminal.

[0162] In another preferred embodiment of the present invention, a computer-readable storage medium is provided for storing a program that, when executed, implements the steps of the multi-battery charging method described above. The computer-readable storage medium may be, but is not limited to, a portable compact disk read-only memory and includes program code, which can be executed on a terminal device. In some possible embodiments, various aspects of the present invention may also be implemented in the form of a program product, such as program code. When the program product is executed on a device, the program code causes the device to execute the steps of the exemplary embodiment of the multi-battery charging method described above in this specification.

[0163] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A multi-battery charging method, characterized in that: The steps include: S1. Obtaining the cell temperature of each battery in the batteries to be charged, pre-processing the batteries to be charged according to the cell temperature, and screening out rechargeable batteries; S2. Calculate and check whether there is currently available charging power. If so, scan the SOC value of the rechargeable battery; S3, determining whether the SOC value is within the range [SOC1, SOC2), if so, executing step S4, if not, executing step S5; S4. Arrange the charging order of the rechargeable batteries according to the SOC values from large to small, distribute the charging current according to the charging order, charge the rechargeable batteries, and execute step S1; S5, determining whether the SOC value is less than SOC1, if so, executing step S6, if not, executing step S7; S6. Using the remaining available charging power to charge the rechargeable battery whose SOC value is less than SOC1, and executing step S1; S7, charging the rechargeable battery with a low current until the battery is fully charged; The available charging power is determined by the charging power that can be allocated to the current rechargeable battery, and the input power determines the available charging power; the input power is greater than or equal to 60% of the total charging power; The available charging power is obtained by the following formula: Where, P o(sys) is the available charging power; P in(sys) is the input power, is the total charging power consumed by the rechargeable batteries currently being charged, n is the number of rechargeable batteries being charged, P (other) For other power consumption; The input power satisfies the following formula: Among them, P in(sys) is the input power; is the sum of the charging powers of the rechargeable batteries when all the rechargeable batteries are charged at the maximum current; m is the number of rechargeable batteries that can be accommodated.

2. A multi-battery charging method according to claim 1, characterized in that: The step S1 specifically includes: Determining a charging priority level of the battery to be charged according to the battery core temperature, the charging priority level including low charging priority, medium charging priority and high charging priority; When the charging priority is low, the battery to be charged is not charged; When the charging priority level is medium, the battery to be charged is charged with a low current until the charging priority level is high; When the charging priority is high, the battery to be charged is the rechargeable battery.

3. A multi-battery charging method according to claim 2, characterized in that: The priority coefficient f(t) of the battery to be charged is obtained according to the following formula: Wherein, Tbt is the battery cell temperature; The value of the priority coefficient f(t) is in the range of [0, f1), which belongs to low charging priority; The value of the priority coefficient f(t) is in the range [f1, f2), which belongs to the medium charging priority; The value of the priority coefficient f(t) is in the range of [f2, 1], which belongs to high charging priority.

4. A multi-battery charging method as claimed in claim 1, characterized in that: The step S4 specifically includes: S41, arranging the charging order of the rechargeable batteries from large to small according to the SOC values; S42, allocating a maximum charging current to the rechargeable battery with the highest SOC value, and allocating a maximum charging current to the remaining rechargeable batteries in descending order of charge according to currently available charging power; S43, when the SOC value ≥ SOC2, charging is performed according to step S7; S44: Repeat step S41 for the remaining rechargeable batteries to charge.

5. A multi-battery charging method as claimed in claim 1, characterized in that: The step S6 specifically includes: S611. Calculate the remaining available charging power. S612, calculating the sum of the powers of all the rechargeable batteries with SOC values in the interval (0, SOC1) when charged at the maximum charging current, and determining whether the remaining available charging power is greater than the sum of the powers; if so, executing step S613; if not, executing step S614; S613, performing maximum current charging on all the rechargeable batteries whose SOC values are within the interval (0, SOC1), and executing step S1; S614. Sort all the rechargeable batteries whose SOC values are in the interval (0, SOC1) in ascending order according to the SOC values, select the first k rechargeable batteries for maximum current charging, and charge the remaining rechargeable batteries according to a current that evenly distributes the remaining available charging power, and execute step S1.

6. A multi-battery charging method as claimed in claim 1, characterized in that: When the SOC values in step S3 are all within the interval (0, SOC1), step S6 specifically includes: S621, determining whether the available charging power at this time is sufficient to charge each rechargeable battery at the maximum current; if so, executing step S622; if not, executing step S623; S622, all the rechargeable batteries are charged at the maximum current, and step S1 is executed; S623, sorting the rechargeable batteries in descending order of the SOC values; S624. Charge the first half of the rechargeable batteries with a current that is evenly distributed to 2 / 3 of the available charging power, and charge the second half of the rechargeable batteries with a current that is evenly distributed to the remaining 1 / 3 of the available charging power, and execute step S1.

7. A multi-battery charging system for implementing a multi-battery charging method according to any one of claims 1 to 6, characterized in that: include: a temperature priority evaluation module, which obtains the cell temperature of each battery in the battery to be charged, pre-processes the battery to be charged according to the cell temperature, and screens out rechargeable batteries; The power detection and SOC scanning module calculates and checks whether the current system has available charging power. If so, it scans the SOC value of the rechargeable battery; A first determination module determines whether the SOC value is within the range [SOC1, SOC2), and if so, executes the first charging module; if not, executes the second determination module; a first charging module, arranged in descending order of the charging sequence of the rechargeable batteries according to the SOC values, allocated charging current according to the charging sequence, charged the rechargeable batteries, and executed the temperature priority evaluation module; A second determination module determines whether the SOC value is less than SOC1, and if so, executes the second charging module; if not, executes the third charging module; a second charging module, which uses the remaining available charging power to charge the rechargeable battery having an SOC value less than SOC1, and executes the temperature priority evaluation module; A third charging module charges the rechargeable battery with a low current until the battery is fully charged; The available charging power is determined by the charging power that can be allocated to the current rechargeable battery, and the input power determines the available charging power; the input power is greater than or equal to 60% of the total charging power; The available charging power is obtained by the following formula: Where, P o(sys) is the available charging power; P in(sys) is the input power, is the total charging power consumed by the rechargeable batteries currently being charged, n is the number of rechargeable batteries being charged, P (other) For other power consumption; The input power satisfies the following formula: Among them, P in(sys) is the input power; is the sum of the charging powers of the rechargeable batteries when all the rechargeable batteries are charged at the maximum current; m is the number of rechargeable batteries that can be accommodated.

8. A multi-battery charging device, characterized in that: include: A processor configured to perform the steps of the multi-battery charging method according to any one of claims 1 to 6 by executing executable instructions; A memory is used to store the executable instructions of the processor.

9. A charging / swapping cabinet, characterized in that: It comprises a control terminal, which comprises a multi-battery charging device as claimed in claim 8.

10. A computer-readable storage medium for storing a program, characterized in that: When the program is executed, the steps of the multi-battery charging method according to any one of claims 1 to 6 are implemented.

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