Power supply control method and device of battery system

Abstract

The application provides a power supply control method and device of a battery system, wherein the power supply control method of the battery system comprises the following steps: acquiring current charge parameters, current output currents of a main battery module and each first battery module, and a current total output current of the battery system; determining a target power supply mode according to the current charge parameters of the main battery module and each first battery module; calculating target output currents of the main battery module and each first battery module based on the target power supply mode, the current parameters of the main battery module and each first battery module, and the current total output current; and controlling the main battery module and each first battery module to supply power to a target object according to the target output currents of the main battery module and each first battery module. The state of charge balance between the main battery module and each first battery module in the target object is fully considered, and the endurance of the target object is improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicles, and more specifically to a power supply control method and apparatus for a battery system. Background Technology

[0002] Range anxiety has always been a key issue hindering the development of electric vehicles. To improve the driving range of electric vehicles, researchers have proposed various solutions, including increasing the capacity of electric vehicle battery modules, fast charging of battery modules, and wireless charging. However, these methods have problems such as high manufacturing costs, complex wiring, and immature technology. Therefore, many electric vehicle manufacturers have identified battery module swapping as a key technology for their research and development.

[0003] Traditional battery swapping methods include roof-mounted, side-mounted, and bottom-mounted battery swapping. However, regardless of the method used, the entire vehicle battery pack needs to be replaced during the swapping process. Therefore, a complete set of battery swapping equipment, including mechanical and electrical structures, is required, which is costly. For electric vehicles that provide battery swapping modules, the battery swapping module and the main battery module may have a charge imbalance, which may affect the electric vehicle's range over a long period of time. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the limitation that the battery swapping module of electric vehicles can only be replaced as a whole in the prior art, and the lack of consideration for the imbalance of the state of charge between the battery swapping module and the main battery module, which has the defect of affecting the driving range of electric vehicles, thereby providing a power supply control method and device for a battery system.

[0005] According to a first aspect, embodiments of the present invention provide a power supply control method for a battery system, the battery system comprising: a main battery module and a plurality of replaceable first battery modules, wherein the first battery modules are connected in parallel with the main battery module to supply power to a target object, the method comprising:

[0006] The current charge parameters, current output current of the main battery module and each of the first battery modules, and the current total output current of the battery system are obtained respectively.

[0007] The target power supply mode is determined based on the current charge parameters of the main battery module and each of the first battery modules;

[0008] Based on the target power supply mode, the target output current of the main battery module and / or each of the first battery modules is calculated using the current charge parameters, the current output current, and the current total output current corresponding to the main battery module and / or each of the first battery modules.

[0009] According to the target output current of the main battery module and / or each of the first battery modules, control the main battery module and / or each of the first battery modules to supply power to the target object.

[0010] Optionally, determining the target power supply mode based on the current charge parameters of the main battery module and each of the first battery modules includes:

[0011] Determine whether the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules exceed a preset power threshold.

[0012] When the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules both exceed the preset power threshold, the hybrid power supply mode of the main battery module and each of the first battery modules is determined as the target power supply mode.

[0013] When the current charge parameter of the main battery module does not exceed the preset power threshold, and the current charge parameter of each first battery module exceeds the preset power threshold, the power supply mode of each first battery module is determined as the target power supply mode.

[0014] When the current charge parameter of the main battery module exceeds the preset power threshold, and the current charge parameter of each of the first battery modules does not exceed the preset power threshold, the power supply mode of the main battery module is determined as the target power supply mode.

[0015] Optionally, when the target power supply mode is a hybrid power supply mode, the step of calculating the target output current of the main battery module and each of the first battery modules using the current charge parameters, the current output current, and the current total output current corresponding to the main battery module and each of the first battery modules includes:

[0016] Based on the current charge parameters corresponding to each of the first battery modules, calculate the current average charge parameters of the first battery modules.

[0017] The target output current of the main battery module and each of the first battery modules is calculated based on the current charge parameters of the main battery module, the current average charge parameters of each of the first battery modules, and the current total output current.

[0018] Optionally, controlling the main battery module and each of the first battery modules to supply power to the target object according to the target output current of the main battery module and each of the first battery modules includes:

[0019] Calculate the first deviation between the target output current of the main battery module and the current output current of the main battery module, and the second deviation between the target output current of each first battery module and the current output current of the first battery module.

[0020] A first control command is generated based on the first deviation.

[0021] A second control command is generated based on the second deviation.

[0022] The output current of the main battery module is adjusted according to the first control command, and the output current of each first battery module is adjusted according to the second control command corresponding to each first battery module.

[0023] Optionally, generating the second control command based on the second deviation includes:

[0024] The duty cycle of the drive signal corresponding to the current first battery module is determined based on the second deviation of the current first battery module;

[0025] The second control command is generated based on the duty cycle.

[0026] Optionally, the method further includes:

[0027] When the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules do not exceed the preset power threshold, the current power supply mode is maintained and an alarm is triggered.

[0028] Optionally, the method further includes:

[0029] Once at least one group of the first battery modules has been replaced, the process returns to the steps of obtaining the current charge parameters, current output current, and current total output current of the battery system for each main battery module and each of the first battery modules.

[0030] According to a second aspect, embodiments of the present invention provide a power supply control device for a battery system, the battery system comprising: a main battery module and a plurality of replaceable first battery modules, wherein the first battery modules are connected in parallel with the main battery module to supply power to a target object, the device comprising:

[0031] The acquisition module is used to acquire the current charge parameters, current output current of the main battery module and each of the first battery modules, and the current total output current of the battery system, respectively.

[0032] The first processing module is used to determine the target power supply mode based on the current charge parameters of the main battery module and each of the first battery modules;

[0033] The second processing module is used to calculate the target output current of the main battery module and / or each of the first battery modules based on the target power supply mode, using the current charge parameters, the current output current and the current total output current corresponding to the main battery module and / or each of the first battery modules.

[0034] The third processing module is used to control the main battery module and / or each of the first battery modules to supply power to the target object according to the target output current of the main battery module and / or each of the first battery modules.

[0035] According to a third aspect, embodiments of the present invention provide an electronic device, comprising:

[0036] A memory and a processor are communicatively connected, the memory storing computer instructions, and the processor executing the computer instructions to perform the method described in the first aspect, or any alternative embodiment of the first aspect.

[0037] According to a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing a computer to perform the method described in the first aspect, or any optional embodiment of the first aspect.

[0038] The technical solution of this invention has the following advantages:

[0039] The present invention provides a power supply control method and apparatus for a battery system, the battery system comprising: a main battery module and a plurality of replaceable first battery modules, wherein the first battery modules are connected in parallel with the main battery module to supply power to a target object. The method involves acquiring the current charge parameters, current output current, and current total output current of the main battery module and each of the first battery modules; determining a target power supply mode based on the current charge parameters of the main battery module and each of the first battery modules; calculating the target output current of the main battery module and / or each of the first battery modules based on the target power supply mode using the current charge parameters, current output current, and current total output current corresponding to the main battery module and / or each of the first battery modules; and controlling the main battery module and / or each of the first battery modules to supply power to the target object according to the target output current of the main battery module and / or each of the first battery modules. By automatically selecting the target power supply mode using real-time battery parameters of the battery system, the continuity and stability of uninterrupted power supply to the target object are ensured. By calculating the target output current of the main battery module and / or each first battery module, and controlling the main battery module and / or each first battery module to supply power to the target object, the balance of the state of charge between the main battery module and each first battery module inside the target object containing the first battery module is fully considered, realizing stable and efficient power supply control to the target object, thereby improving the target object's endurance. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a flowchart of a power supply control method for a battery system according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the power supply mode operation of the power supply control method of the battery system according to an embodiment of the present invention.

[0043] Figure 3 This is a schematic diagram of the power supply mode switching of the power supply control method for the battery system according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the balance control between the main battery module and the first battery module in the hybrid mode of the power supply control method of the battery system according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the first battery module balance control in the power supply control method of the battery system according to an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the power supply control device of the battery system according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0048] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] This invention provides a power supply control method for a battery system. The battery system includes a main battery module and several replaceable first battery modules. The first battery modules are connected in parallel with the main battery module to supply power to a target object. Figure 1 As shown, the power supply control method of this battery system specifically includes the following steps:

[0053] Step S101: Obtain the current charge parameters, current output current, and current total output current of the battery system for the main battery module and each first battery module. This embodiment of the invention uses an electric vehicle as an example to illustrate the power supply control method for a battery system containing a first battery module. However, the actual situation is not limited to this; the target object can be any device containing a first battery module (i.e., a battery swapping module).

[0054] Specifically, in practical applications, "range anxiety" has always been a key issue restricting the development of electric vehicles. Although researchers have proposed various solutions, such as fast charging and dynamic charging via wireless charging during vehicle operation, these methods suffer from high costs and are still in the laboratory testing phase due to immature technology. Currently, these methods cannot be effectively used to power electric vehicles. Furthermore, while consumers can drive their cars to designated battery swapping stations, in situations like highway or urban traffic jams, the remaining battery power may not be sufficient to reach the station. Moreover, consumers are unaware of the condition of the new battery, and many people do not want to replace their car with a poorly functioning battery (especially in a new car). Therefore, while ensuring safety, developing a method for manual battery swapping (without needing to go to a specific swapping location, specific equipment, or special skills training) has become a key research focus for researchers.

[0055] Specifically, in practical applications, the embodiments of the present invention have designed the layout of the vehicle battery modules. The vehicle battery can be divided into a high-power main battery module and a low-power battery swapping module (i.e., the first battery module). When the vehicle is driving normally, both can supply power simultaneously. When the main battery module is low on power, it switches to the low-power battery swapping module to supply power separately. When the battery swapping module is low on power, manual and rapid battery swapping can be performed.

[0056] Specifically, in practical applications, the embodiments of the present invention collect information such as battery voltage, current and temperature of the main battery module and each first battery module through the main controller, and calculate parameters such as capacity, current charge parameter SOC (i.e. current remaining power) and battery health SOH of the main battery module and each first battery module.

[0057] Step S102: Determine the target power supply mode based on the current charge parameters of the main battery module and each first battery module.

[0058] Specifically, in practical applications, the overall battery system of this invention can be divided into two parts: a high-power main battery module and a low-power battery swapping module, which are connected to the bus in parallel. The high-power main battery module and the low-power battery swapping module, as independent power supply modules, can provide energy to the load either together or individually. Therefore, three power supply modes are available: a high-power main battery module power supply mode, a low-power battery swapping module power supply mode, and a hybrid power supply mode. Adaptive switching between these power supply modes can be achieved through the battery management system. The power supply modes are as follows: Figure 2 As shown.

[0059] in, Figure 2 The left image shows the power supply from the high-power main battery module; Figure 2 The middle image shows the power supply for the low-power battery swapping module; Figure 2 The image on the right shows a hybrid power supply. Currently, lithium iron phosphate batteries have an energy density of 160–200 kWh / kg, while ternary lithium batteries have an even higher energy density. For common electric passenger vehicles, each kWh can power a vehicle for 6–8 km. If each battery swapping module weighs 10 kg, it has a capacity of 2 kWh, enough for approximately 15 km of driving. Swapping three battery swapping modules at a time allows for a driving range of 45 km, with the swapping time taking only a few minutes. In case of low battery, the vehicle can continue driving to a charging station or to its destination via a quick manual battery swap. Therefore, by rationally selecting the power supply mode, "range anxiety" for drivers can be significantly reduced.

[0060] Step S103: Based on the target power supply mode, calculate the target output current of the main battery module and / or each first battery module using the current charge parameters, current output current and current total output current corresponding to the main battery module and / or each first battery module.

[0061] Specifically, in practical applications, embodiments of the present invention calculate the target output current of the main battery module and / or each first battery module by determining the target power supply mode. When the high-power main battery module is powered in the target power supply mode, the output current control process of the main battery module can be implemented by referring to the existing technology for battery output current control, and the specific implementation process will not be elaborated here. When the low-power battery swapping module is powered in the target power supply mode, the current charge parameters, current output current, and current total output current (i.e., the actual measured bus current) of each battery swapping module will be obtained, the average charge parameters and average output current will be calculated, and the target output current of each battery swapping module will be calculated based on the difference between the current charge parameters and average charge parameters of each battery swapping module, and the difference between the current output current and average output current, thereby realizing the charge balance control within the battery swapping module. When the hybrid power supply mode is the target power supply mode, the target output current of the main battery module and each first battery module will be calculated using the current charge parameters, current output current, and current total output current of the main battery module and each first battery module, thereby realizing the balance control between the battery swapping module and the main battery module.

[0062] Preferably, in order to ensure the charge balance between the main battery module and each battery swapping module, and within each battery swapping module, this embodiment of the invention also sets up a charge balance controller, a current controller, and other controllers to perform balance control on the circuit. The charge balance controller and the current controller can adopt different control methods, such as a PI controller, predictive control, feedforward control, etc. The setting process of the controller is based on the prior art and will not be described in detail here.

[0063] Step S104: Control the main battery module and / or each first battery module to supply power to the target object according to the target output current of the main battery module and / or each first battery module.

[0064] Specifically, in practical applications, embodiments of the present invention input the adjusted target output current into the electric vehicle to power the electric vehicle.

[0065] The power supply control method for a battery system provided in this invention includes a main battery module and several replaceable first battery modules. The first battery modules are connected in parallel with the main battery module to supply power to a target object. The method involves acquiring the current charge parameters, current output current, and current total output current of the battery system for the main battery module and each first battery module. Based on the current charge parameters of the main battery module and each first battery module, a target power supply mode is determined. Based on the target power supply mode, the target output current of the main battery module and / or each first battery module is calculated using the current charge parameters, current output current, and current total output current of the main battery module and / or each first battery module. The method then controls the main battery module and / or each first battery module to supply power to the target object according to the target output current. By automatically selecting the target power supply mode using real-time battery parameters of the battery system, the continuity and stability of uninterrupted power supply to the target object are ensured. By calculating the target output current of the main battery module and / or each first battery module, and controlling the main battery module and / or each first battery module to supply power to the target object, the balance of the state of charge between the main battery module and each first battery module inside the target object containing the first battery module is fully considered, realizing stable and efficient power supply control to the target object, thereby improving the target object's endurance.

[0066] Specifically, in one embodiment, step S102 above determines the target power supply mode based on the current remaining power of the main battery module and each first battery module, and specifically includes the following steps:

[0067] Step S201: Determine whether the current charge parameters of the main battery module and the current charge parameters of each first battery module exceed the preset power threshold.

[0068] Step S202: When the current charge parameters of the main battery module and the current charge parameters of each first battery module both exceed the preset power threshold, the hybrid power supply mode of the main battery module and each first battery module is determined as the target power supply mode.

[0069] Step S203: When the current charge parameter of the main battery module does not exceed the preset power threshold, and the current charge parameter of each first battery module exceeds the preset power threshold, the power supply mode of each first battery module is determined as the target power supply mode.

[0070] Step S204: When the current charge parameter of the main battery module exceeds the preset power threshold, and the current charge parameter of each first battery module does not exceed the preset power threshold, the power supply mode of the main battery module is determined as the target power supply mode.

[0071] like Figure 3As shown, the embodiments of the present invention set switching conditions such as battery charge parameters (i.e., remaining power), load power consumption, and operating environment. When the main battery module and each battery swapping module meet certain switching conditions, the power supply mode is switched, thereby realizing the adaptive switching of the battery system power supply mode.

[0072] Specifically, in practical applications, this embodiment of the invention first performs a self-check on the power levels of the main battery module and each battery swapping module within the battery system, and then sets the State of Charge (SOC) parameter of the main battery module. main Average charge parameter (SOC) of the battery swapping module avg The power supply mode of the battery system is selected based on the current charge parameters by comparing the current charge threshold with a preset charge threshold.

[0073] Preferably, the preset power threshold Q set in this embodiment of the invention is 10%, that is, when the current remaining power exceeds 10%, it indicates that the module has sufficient power. The value of Q can be adjusted according to the actual situation.

[0074] Specifically, in one embodiment, step S102, which determines the target power supply mode based on the current charge parameters of the main battery module and each first battery module, further includes the following steps:

[0075] Step S205: When the current charge parameters of the main battery module and the current charge parameters of each first battery module do not exceed the preset power threshold, maintain the current power supply mode and issue an alarm.

[0076] For example, such as Figure 3 As shown, when both the main battery module and the low-power battery swapping module have sufficient power (i.e., both exceed the preset power threshold Q), the system enters mode 3 (hybrid power supply mode); when the main battery module has insufficient power but the battery swapping module has sufficient power, the system enters mode 2 (low-power battery swapping module power supply mode); when the low-power battery swapping module has insufficient power but the main battery module has sufficient power, the system enters mode 1 (main battery module power supply mode); when both have insufficient power, the existing power supply mode is maintained, and an alarm is triggered to remind the user. In addition, the user can manually replace the low-power battery swapping module to achieve the purpose of extending battery life.

[0077] In addition, to better ensure that the electric vehicle arrives at its destination smoothly, this embodiment of the invention also reserves a backup battery module. When the remaining power of the main battery module and the battery swapping module is insufficient to support the electric vehicle to reach its destination, the driver can replace a portion of the battery swapping module with the backup battery module to ensure the driving requirements of the electric vehicle.

[0078] Specifically, in one embodiment, when the target power supply mode is a hybrid power supply mode, the above step S103 calculates the target output current of the main battery module and each first battery module using the current charge parameters, current output current, and current total output current corresponding to the main battery module and each first battery module, specifically including the following steps:

[0079] Step S301: Calculate the current average charge parameter of the first battery module based on the current charge parameter corresponding to each first battery module.

[0080] Specifically, in practical applications, when a low-power battery swapping module is connected to the battery system, the remaining charge of the newly swapped module and the original battery swapping module may not be the same. Therefore, in order to ensure stable system operation, it is necessary to perform balance control based on the charge parameters of the battery swapping modules. In other words, the newly swapped battery module has a high charge and can provide a higher current, while the original old battery module has a low charge and can provide a lower current, until all modules reach balance and supply power with the same current. In this embodiment of the invention, the current average charge parameter SOC of the battery swapping module is calculated using formula (1). avg :

[0081]

[0082] Where N represents the number of validly connected first battery modules; SOC batN This represents the current charge parameters of the first battery module in the Nth group.

[0083] Step S302: Calculate the target output current of the main battery module and each first battery module based on the current charge parameters of the main battery module, the current average charge parameters of each first battery module, and the current total output current.

[0084] Specifically, in practical applications, when the target power supply mode is a hybrid power supply mode, the high-power main battery module and the low-power battery swapping module also need to be balanced and controlled, as shown in the control block diagram below. Figure 4 As shown in the figure. This embodiment of the invention calculates the target output current of the main battery module and each first battery module separately, and adjusts their corresponding reference current values, thereby achieving balanced control between the main battery module and the battery swapping module.

[0085] Specifically, the target output current of the main battery module and the battery swapping module is calculated using the following formula:

[0086]

[0087]

[0088] Among them, I main_ref Target output current value of the main battery module; I avg_refThe target output current value for the first battery module (i.e., the battery swapping module); SOC main Current charge parameters of the main battery module; SOC avg I represents the current average charge parameter of the first battery module. bus This represents the current total output current, i.e., the actual measured bus current; G SOC Let x be the transfer function of the charge balancer; x is the current distribution coefficient; C main The battery capacity of the main battery module; C avg N represents the battery capacity of a single first battery module; N represents the number of first battery modules that are effectively connected.

[0089] For example, x can be 0.5, that is, the main battery module and the first battery module each allocate 50% of the total output current. However, the actual situation is not limited to this. The value of x can be changed according to the actual situation to achieve charge balance between the main battery module and the first battery module.

[0090] Specifically, in practical applications, embodiments of the present invention utilize the target output current value I of the main battery module. main_ref And by controlling the converter, the output current I of the actual main battery module is... main Adjustments are made; the target output current value I of the first battery module is utilized. avg_ref This serves as a reference value for the internal balance control of the first battery module.

[0091] Specifically, in one embodiment, after performing step S302 above, the main battery module and each first battery module are controlled to supply power to the target object according to the target output current of the main battery module and each first battery module, specifically including the following steps:

[0092] Step S401: Calculate the first deviation between the target output current of the main battery module and the current output current of the main battery module, and the second deviation between the target output current of each first battery module and the current output current of the first battery module.

[0093] Specifically, in practical applications, embodiments of the present invention use the target output current value I of the main battery module. main_ref The battery deviation result of the main battery module is obtained by calculating the first deviation between the current output current and the target output current value I of the first battery module; avg_ref The second deviation between the current output current and the current output current is calculated to obtain the battery deviation result of the first battery module.

[0094] Step S402: Generate a first control command based on the first deviation.

[0095] Step S403: Generate a second control command based on the second deviation.

[0096] Step S404: Adjust the output current of the main battery module according to the first control command, and adjust the output current of each first battery module according to the second control command corresponding to each first battery module.

[0097] Based on the deviation results, the embodiments of the present invention generate corresponding control commands. The output current of the main battery module is adjusted according to the first control command, and the output current of each first battery module is adjusted according to the second control command, thereby ensuring that the main battery module and each first battery module achieve charge balance. While ensuring the mileage requirements, the loss of electric vehicle caused by the current imbalance between the main battery module and the battery swapping module is greatly reduced.

[0098] Specifically, in one embodiment, step S403 above, which generates a second control command based on a second deviation, specifically includes the following steps:

[0099] Step S501: Determine the duty cycle of the drive signal corresponding to the current first battery module based on the second deviation of the current first battery module.

[0100] Step S502: Generate a second control command based on the duty cycle.

[0101] Specifically, in practical applications, when a low-power battery swapping module is connected to the battery system, the remaining charge levels of the newly swapped module and the existing battery swapping module may differ. Therefore, to ensure stable system operation, balancing control is required based on the charge parameters of the battery swapping modules. In other words, the newly swapped battery module, with its higher charge, can provide a higher current, while the existing battery module, with its lower charge, can provide a lower current, until all modules reach a balance and are powered by the same current. This avoids charging damage to individual battery modules and further prevents secondary damage to the electric vehicle, extending its service life.

[0102] This invention uses the balance control of the first battery module in the first group as an example for illustration. The specific control process is as follows: Figure 5 As shown. Where N represents the number of validly connected first battery modules; SOC batN The current charge parameters of the first battery module in group N; I batN This represents the current value of the first battery module in group N; G SOC G cur and G PWM These are the transfer functions for the charge balance controller, current controller, and PWM waveform generator, respectively.

[0103] Depend on Figure 5 It can be seen that the input to the charge balance controller is the SOC (State of Charge) parameter of the first battery module in the first group. bat1The difference between the average charge parameters of all first battery modules and the output is multiplied by the average current reference value I of all first battery modules. avg_ref The reference current value I of the first group of first battery modules is obtained. bat1_ref The reference value I bat1_ref And the actual current value I of the first battery module in the first group bat1 The result of the subtraction is input to the current controller. The output of the current controller generates the converter control signal D through the PWM waveform generator. The switching of the control signal is achieved by switching the duty cycle between high and low frequencies.

[0104] Specifically, the embodiments of the present invention take the first group of first battery modules as an example for illustration. The control signal of the first group of first battery modules can be calculated by formula (4). The calculation of the control signal of each group of first battery modules is similar to that of the first group of first battery modules. They can all be calculated by referring to formula (4), and will not be described again here.

[0105] D=((1-(SOC avg -SOC bat1 )·GSOC)·I avg_ref -I bat1 )·G cur ·G PWM (4)

[0106] Among them, SOC avg The current average charge parameter of the first battery module; SOC bat1 The current charge parameters of the first battery module in the first group; I bat1 This is the current value of the first battery module in the first group.

[0107] This invention achieves charging of electric vehicles with the same current by performing charge balancing between first battery modules and between the main battery module and the first battery modules. While meeting the basic requirements of users for the range of electric vehicles, it also fully considers the charge balancing between different battery swapping modules and between the main battery module and the first battery module, thus avoiding damage to the electric vehicle's battery.

[0108] Specifically, in practical applications, when the target power supply mode is the power supply mode of each first battery module, the average charge parameter can be calculated by referring to formula (1). Based on the deviation between the current charge parameter of each first battery module and the average charge parameter, the output of each first battery module is adjusted. The specific adjustment process can refer to the process of determining the duty cycle of the drive signal based on the deviation and generating control commands based on the duty cycle in step S403 above. It will not be elaborated here.

[0109] Specifically, in one embodiment, after performing the above steps S101 to S104, the following steps are further included:

[0110] Step S601: After monitoring that at least one group of first battery modules has been replaced, return to the steps of obtaining the current charge parameters, current output current and current total output current of the battery system of the main battery module and each first battery module respectively.

[0111] Specifically, in practical applications, embodiments of the present invention can realize real-time monitoring of the battery system, thereby enabling adaptive switching of the power supply mode based on the relevant parameters of the main battery module and the first battery module.

[0112] By performing the above steps, the power supply control method for a battery system provided in this embodiment of the invention includes: a main battery module and several replaceable first battery modules. The first battery modules are connected in parallel with the main battery module to supply power to a target object. The method involves acquiring the current charge parameters, current output current, and current total output current of the battery system for the main battery module and each first battery module; determining a target power supply mode based on the current charge parameters of the main battery module and each first battery module; calculating the target output current of the main battery module and / or each first battery module based on the target power supply mode using the current charge parameters, current output current, and current total output current of the main battery module and / or each first battery module; and controlling the main battery module and / or each first battery module to supply power to the target object according to the target output current of the main battery module and / or each first battery module. By automatically selecting the target power supply mode using real-time battery parameters of the battery system, the continuity and stability of uninterrupted power supply to the target object are ensured. By calculating the target output current of the main battery module and / or each first battery module, and controlling the main battery module and / or each first battery module to supply power to the target object, the balance of the state of charge between the main battery module and each first battery module inside the target object containing the first battery module is fully considered, realizing stable and efficient power supply control to the target object, thereby improving the target object's endurance.

[0113] The power supply control method for the battery system provided in this embodiment of the invention will be described in detail below with reference to specific application examples.

[0114] Combination Figures 1-5As shown, the battery system of this embodiment includes: a main battery module and several replaceable first battery modules. The first battery modules are connected in parallel with the main battery module to supply power to the target object. After the first battery module is swapped, the main controller first collects information such as battery voltage, current, and temperature of the main battery module and each first battery module, and calculates parameters such as capacity, current charge parameter (SOC) (i.e., current remaining power) and battery health (SOH) of the main battery module and each first battery module. The charge parameters of the main battery module and the current charge parameters of the swapping modules are compared with preset power thresholds to determine the target power supply mode. Based on the target charging mode, the main battery module and / or each swapping module supply power to the target object with the target output current.

[0115] To achieve charge balance between the main battery module and the battery swapping module, the target output current of the main battery module and the battery swapping module is calculated based on their respective charge parameters, current output current, battery capacity, and total output current. On this basis, the deviation between their respective target output current and their corresponding current output current is calculated, thereby generating the control signals required by the main battery module and the battery swapping module. By switching the control signals on and off, the main battery module and the battery swapping module are controlled to output with the same target output current.

[0116] Furthermore, since there are several battery swapping modules, in order to achieve charge balance among the battery swapping modules, this embodiment of the invention calculates the average charge parameters, uses a charge balance controller, a current controller and other controllers to balance the current among the battery swapping modules, and generates the control signals required by each battery swapping module through a PWM waveform generator, thereby ensuring that each battery swapping module supplies power to the target object with the target output current.

[0117] By selecting the target power supply mode, the continuity and stability of uninterrupted power supply to the target object are ensured. By calculating the target output current of the main battery module and / or each first battery module, and controlling the main battery module and / or each first battery module to supply power to the target object, the balance of the state of charge between the main battery module and each first battery module inside the target object containing the first battery module is fully considered, realizing stable and efficient power supply control to the target object, thereby improving the target object's endurance.

[0118] This invention provides a power supply control device for a battery system. The battery system includes a main battery module and several replaceable first battery modules. The first battery modules are connected in parallel with the main battery module to supply power to a target object. Figure 6 As shown, the power supply control device of the battery system includes:

[0119] The acquisition module 101 is used to acquire the current charge parameters, current output current, and current total output current of the battery system for the main battery module and each first battery module. For details, please refer to the relevant description of step S101 in the above method embodiment, which will not be repeated here.

[0120] The first processing module 102 is used to determine the target power supply mode based on the current charge parameters of the main battery module and each first battery module. For details, please refer to the relevant description of step S102 in the above method embodiment, which will not be repeated here.

[0121] The second processing module 103 is used to calculate the target output current of the main battery module and / or each first battery module based on the target power supply mode, using the current charge parameters, current output current, and current total output current corresponding to the main battery module and / or each first battery module. For details, please refer to the relevant description of step S103 in the above method embodiments, which will not be repeated here.

[0122] The third processing module 104 is used to control the main battery module and / or each first battery module to supply power to the target object according to the target output current of the main battery module and / or each first battery module. For details, please refer to the relevant description of step S104 in the above method embodiments, which will not be repeated here.

[0123] For a further description of the power supply control device of the battery system described above, please refer to the relevant description of the embodiment of the power supply control method of the battery system described above, which will not be repeated here.

[0124] Through the collaborative operation of the aforementioned components, the power supply control device for the battery system provided in this embodiment of the invention automatically selects the target power supply mode using the real-time battery parameters of the battery system, ensuring the continuity and stability of uninterrupted power supply to the target object. By calculating the target output current of the main battery module and / or each first battery module, and controlling the main battery module and / or each first battery module to supply power to the target object, the device fully considers the state of charge balance between the main battery module and each first battery module within the target object containing the first battery module, thereby achieving stable and efficient power supply control to the target object and improving the target object's endurance.

[0125] This invention provides an electronic device, such as... Figure 7 As shown, the electronic device includes a processor 901 and a memory 902, which are communicatively connected. The processor 901 and memory 902 can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0126] Processor 901 can be a Central Processing Unit (CPU). Processor 901 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0127] The memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the embodiments of the present invention. The processor 901 executes various functional applications and data processing of the processor 901 by running the non-transitory software programs, instructions, and modules stored in the memory 902, thereby implementing the methods in the above-described method embodiments.

[0128] The memory 902 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 901, etc. Furthermore, the memory 902 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 902 may optionally include memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0129] One or more modules are stored in memory 902, and when executed by processor 901, they perform the methods described in the above method embodiments.

[0130] The specific details of the aforementioned electronic device can be understood by referring to the relevant descriptions and effects in the above method embodiments, and will not be repeated here.

[0131] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The implemented program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0132] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A power supply control method for a battery system, characterized in that, The battery system includes: a main battery module and several replaceable first battery modules, wherein the first battery modules are connected in parallel with the main battery module to supply power to the target object, and the method includes: The current charge parameters, current output current of the main battery module and each of the first battery modules, and the current total output current of the battery system are obtained respectively. The target power supply mode is determined based on the current charge parameters of the main battery module and each of the first battery modules; Based on the target power supply mode, the target output current of the main battery module and / or each of the first battery modules is calculated using the current charge parameters, the current output current, and the current total output current corresponding to the main battery module and / or each of the first battery modules. According to the target output current of the main battery module and / or each of the first battery modules, control the main battery module and / or each of the first battery modules to supply power to the target object; Wherein, when the target power supply mode is a hybrid power supply mode, the step of calculating the target output current of the main battery module and each of the first battery modules using the current charge parameters, the current output current, and the current total output current corresponding to the main battery module and each of the first battery modules includes: calculating the current average charge parameter of the first battery module based on the current charge parameters corresponding to each of the first battery modules; and calculating the target output current of the main battery module and each of the first battery modules based on the current charge parameters of the main battery module, the current average charge parameters of each of the first battery modules, and the current total output current.

2. The method according to claim 1, characterized in that, The step of determining the target power supply mode based on the current charge parameters of the main battery module and each of the first battery modules includes: Determine whether the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules exceed a preset power threshold. When the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules both exceed the preset power threshold, the hybrid power supply mode of the main battery module and each of the first battery modules is determined as the target power supply mode. When the current charge parameter of the main battery module does not exceed the preset power threshold, and the current charge parameter of each first battery module exceeds the preset power threshold, the power supply mode of each first battery module is determined as the target power supply mode. When the current charge parameter of the main battery module exceeds the preset power threshold, and the current charge parameter of each of the first battery modules does not exceed the preset power threshold, the power supply mode of the main battery module is determined as the target power supply mode.

3. The method according to claim 1, characterized in that, The step of controlling the main battery module and each of the first battery modules to supply power to the target object according to the target output current of the main battery module and each of the first battery modules includes: Calculate the first deviation between the target output current of the main battery module and the current output current of the main battery module, and the second deviation between the target output current of each first battery module and the current output current of the first battery module. A first control command is generated based on the first deviation. A second control command is generated based on the second deviation. The output current of the main battery module is adjusted according to the first control command, and the output current of each first battery module is adjusted according to the second control command corresponding to each first battery module.

4. The method according to claim 3, characterized in that, The generation of the second control command based on the second deviation includes: The duty cycle of the drive signal corresponding to the current first battery module is determined based on the second deviation of the current first battery module; The second control command is generated based on the duty cycle.

5. The method according to claim 2, characterized in that, The method further includes: When the current charge parameters of the main battery module and the current charge parameters of each of the first battery modules do not exceed the preset power threshold, the current power supply mode is maintained and an alarm is triggered.

6. The method according to claim 1, characterized in that, The method further includes: Once at least one group of the first battery modules has been replaced, return to the steps of obtaining the current charge parameters, current output current, and current total output current of the battery system for the main battery module and each of the first battery modules.

7. A power supply control device for a battery system, characterized in that, The battery system includes: a main battery module and several replaceable first battery modules, wherein the first battery modules are connected in parallel with the main battery module to supply power to the target object. The device includes: The acquisition module is used to acquire the current charge parameters, current output current of the main battery module and each of the first battery modules, and the current total output current of the battery system, respectively. The first processing module is used to determine the target power supply mode based on the current charge parameters of the main battery module and each of the first battery modules; The second processing module is used to calculate the target output current of the main battery module and / or each of the first battery modules based on the target power supply mode, using the current charge parameters, the current output current and the current total output current corresponding to the main battery module and / or each of the first battery modules. The third processing module is used to control the main battery module and / or each of the first battery modules to supply power to the target object according to the target output current of the main battery module and / or each of the first battery modules; The second processing module is configured to, when the target power supply mode is a hybrid power supply mode, calculate the target output current of the main battery module and each of the first battery modules using the current charge parameters, the current output current, and the current total output current corresponding to the main battery module and each of the first battery modules, including: calculating the current average charge parameter of the first battery module based on the current charge parameters corresponding to each of the first battery modules; and calculating the target output current of the main battery module and each of the first battery modules based on the current charge parameters of the main battery module, the current average charge parameters of each of the first battery modules, and the current total output current.

8. An electronic device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method as described in any one of claims 1-6.

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