Method for actively generating voltage difference between modules of serial dynamic reconfiguration battery system

Abstract

The invention discloses a method for a serial dynamic reconfiguration battery system to actively generate a voltage difference between modules, and belongs to the technical field of energy storage of a new energy power system.The method comprises the steps that based on bus requirements, an energy control unit collects voltage values of the battery modules and compares the collected voltage values of all the battery modules, and the voltage values of all the battery modules are obtained; obtaining a minimum battery module voltage value; carrying out difference calculation on the minimum voltage value of the battery module and the voltage values of other battery modules to obtain a voltage difference; if the voltage difference is greater than the threshold value, selecting n-1 main battery modules in the serial direction for reconstruction; and if the voltage difference is not greater than the threshold value, bypassing the main battery module p corresponding to the minimum voltage value, and normally charging the remaining main battery modules. In the system operation process, the voltage difference between any two main battery modules is actively manufactured, and it is guaranteed that the voltage difference between the two main battery modules can be kept at the preset voltage difference all the time in the whole charging period, so that the bus bus voltage requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage in a new energy power system, and in particular to a method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system. Background Art

[0002] The dynamically reconstructed battery system based on software-defined technology can optimize battery management within the system, balance batteries, ensure battery safety, improve battery utilization, and is compatible with mixed use of multiple types of batteries. It is widely used in cascade battery utilization and base station backup storage integrated systems.

[0003] The dynamic reconstruction battery system based on software-defined technology needs to reconstruct the ideal bus voltage in real time according to the voltage of each battery. Therefore, it is necessary to actively create a voltage difference between a battery module and other battery modules on the basis of balancing the batteries to meet the demand for outputting a specified bus voltage. Based on this, the present invention provides a method for actively generating a voltage difference between modules in a serial dynamic reconstruction battery system. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A method for actively generating a voltage difference between modules in a serial dynamic reconfiguration battery system during charging includes the following steps:

[0007] S1: Based on the bus requirements, the energy control unit collects the voltage value of the battery module and compares all the collected voltage values ​​to obtain the minimum voltage value; the battery module includes n main battery modules and m pseudo battery modules;

[0008] S2: Calculate the difference between the minimum voltage value and other voltage values ​​to obtain the voltage difference; if the voltage difference is greater than the preset threshold, select n-1 main battery modules in the serial direction for reconstruction; if the voltage difference is not greater than the preset threshold, bypass the main battery module p corresponding to the minimum voltage value, and the remaining main battery modules are charged normally.

[0009] Furthermore, in S2, the specific steps of bypassing the battery module corresponding to the minimum voltage value include:

[0010] S27: The energy control unit generates a control instruction based on the minimum voltage value, and sends the control instruction to the energy exchange unit;

[0011] S28: The energy exchange unit serves as a bridge unit for the power circuit of each battery module, and is used to receive control instructions sent by the energy control unit, and control the state of the corresponding single battery module according to the received control instructions, and the state includes shutdown, isolation, and connection.

[0012] Further, the control instructions include 0, 1, and 2; wherein:

[0013] 0 represents a battery module disconnection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to disconnect. At this time, the power circuit corresponding to the battery module is disconnected;

[0014] 1 represents a battery module connection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be connected. At this time, the power circuit corresponding to the battery module is connected;

[0015] 2 represents the battery module isolation instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be bypassed, and the power circuit corresponding to the battery module is connected.

[0016] Furthermore, during the charging process, the output voltage is required to be within 2V lower than the bus voltage.

[0017] Furthermore, the control instruction is generated based on real-time calculation of the reconstruction cycle.

[0018] Furthermore, during the discharge process, the following steps are included:

[0019] The energy control unit collects the voltage values ​​of n main battery modules and compares all the voltage values ​​to obtain the lowest voltage value;

[0020] The difference between the lowest voltage value in the main circuit and the remaining voltage values ​​is calculated to obtain the voltage difference. If the voltage difference is greater than the preset threshold, the n-1 battery modules in the main circuit are reconstructed in the serial direction; if the voltage difference is not greater than the preset threshold, the main battery module q corresponding to the lowest voltage value is forcibly connected, and nq-1 main battery modules are selected from the remaining main battery modules nq for discharge.

[0021] Furthermore, during the discharge process, the output voltage ranges from 57.4V to 58.4V.

[0022] Furthermore, during the discharge process, the voltage difference is guaranteed to be within 0.8V to 1.2V.

[0023] The present invention has at least the following technical effects:

[0024] In order to meet the bus voltage requirement, the present invention actively creates a voltage difference between any two groups of main battery modules during system operation to ensure that the voltage difference between the two main battery modules can be maintained at a preset voltage difference during the entire charging period to meet the bus voltage requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the voltage variation trend diagram of the main battery module during charging;

[0026] Figure 2 A schematic diagram of an energy exchange unit as a bridge unit of a battery module power circuit;

[0027] Figure 3 It is a flowchart of the reconstruction process;

[0028] Figure 4 is a schematic diagram of output bus voltage and time;

[0029] Figure 5 This is a schematic diagram of the structure of the dynamic reconstruction scene one;

[0030] Figure 6 This is a schematic diagram of the structure of the dynamic reconstruction scenario 2;

[0031] Figure 7 This is a structural diagram of dynamic reconstruction scenario three. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with all the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] The embodiment of the present invention discloses a method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system.

[0034] Reference Figure 1-Figure 7 , a method for actively generating a voltage difference between modules in a serial dynamic reconfiguration battery system, during the charging process, comprising the following steps:

[0035] S1: Based on the bus requirements, the energy control unit collects the voltage value of the battery module and compares all the collected voltage values ​​to obtain the minimum voltage value; the battery module includes n main battery modules and m pseudo battery modules;

[0036] S2: Calculate the difference between the minimum voltage value and other voltage values ​​to obtain the voltage difference; if the voltage difference is greater than the preset threshold, select n-1 main battery modules in the serial direction for reconstruction; if the voltage difference is not greater than the preset threshold, bypass the main battery module p corresponding to the minimum voltage value, and the remaining main battery modules are charged normally.

[0037] Specifically, the system actively generates a voltage difference, which is a dynamic process. It is not completed by a few reconstructions, but a dynamic adjustment process. In this embodiment, there are 5 main battery modules. Under ideal conditions, the voltage of each main battery module is 12V; there are 5 pseudo battery modules. Under ideal conditions, the voltage of each pseudo battery module is 2V, and the pseudo battery module serves as a voltage supplement for the main battery module. 10 battery modules are connected in series. In actual use, the voltage of the same type of battery modules will change over time, that is, the voltage of the same type of battery modules will be different.

[0038] Assuming that you want to generate a voltage difference of 1V, when the system detects that the voltage difference reaches 1.5V, it means that the voltage difference exceeds the preset threshold, that is, it meets the requirement and there is no need to increase the voltage distance between the battery modules. The battery modules are reconstructed in the serial direction. The reconstruction of the battery modules must meet the requirement that the output voltage is within 2V lower than the bus voltage during the charging process.

[0039] As time goes by, the use of battery modules will make the voltage difference smaller and smaller. When the voltage difference is lower than the preset threshold, the battery module is removed, that is, the battery module p corresponding to the minimum voltage value is bypassed. After the battery module p is bypassed, no current comes in, and the remaining battery modules are charged normally, so that the battery module (the bypassed battery module p) gradually increases the voltage difference with the remaining battery modules, the purpose is to balance the entire battery system. From the overall point of view, the voltage difference of the present invention is dynamically adjusted above and below the threshold to balance the entire battery system.

[0040] During the charging stage, the energy control unit collects the voltage values ​​of the five main battery modules and compares the five voltage values ​​to obtain the minimum voltage value. The difference between the minimum voltage value and the voltage values ​​of the remaining four main battery modules is calculated to obtain the voltage difference. The voltage difference is compared with the preset threshold. If the voltage difference is greater than the preset threshold, four main battery modules are selected from the five main battery modules for reconstruction; if the voltage difference is not greater than the preset threshold, the main battery module corresponding to the minimum voltage value is bypassed, and the main battery module corresponding to the minimum voltage value is set to p, and the remaining four main battery modules are charged normally. During charging, the output voltage is less than 2V lower than the bus voltage; during charging, the adjustable range of the voltage is large, and the 1V voltage difference can be prioritized, such as Figure 1 As shown in the figure, it is a voltage variation trend diagram of the main battery module during charging. It can be seen from the figure that the voltage difference of the No. 5 main battery module is maintained at 1V; during the charging process, 4 main battery modules and 5 pseudo battery modules are connected to the system to ensure that most of the battery modules can be reconstructed in series and charged evenly. It should be noted that the voltage difference is generated for the main battery module, and does not involve the pseudo battery module.

[0041] Taking the charging stage as an example, the method of controlling the voltage difference specifically includes:

[0042] (1) Before each reconstruction, the voltages of the five main battery modules are sorted. In the embodiment of the present invention, the voltages are sorted in descending order.

[0043] (2) Compare and compare the voltage values ​​of the five main battery modules to obtain the minimum voltage value, and calculate the difference between the minimum voltage value and the voltage values ​​of the other four main battery modules to obtain the voltage difference

[0044] (3) If it is greater than the set value (for example, 1V), it means that the voltage difference is too large, and it is necessary to reduce the difference between the main battery module corresponding to the minimum voltage and the remaining main battery modules. This is inevitable because the set value is set to 1V. When it exceeds the set value, the voltage difference needs to be reduced. The strategy is that these 5 main battery modules perform 5-choice 4. Since it is charging, the battery module corresponding to the minimum voltage in the main battery modules in each reconstruction cycle will definitely be selected; the remaining main battery modules will definitely not be selected. In the subsequent charging process, it is assumed that time t has passed. The main battery module corresponding to the minimum voltage has the lowest voltage, so the main battery module corresponding to the minimum voltage needs to be charged first. Therefore, the charging time of the main battery module corresponding to the minimum voltage must be t, and the charging time of the other main battery modules must be less than t (approximately 4 / 5*t). The difference between the main battery module corresponding to the minimum voltage and the remaining main battery modules will definitely become smaller and smaller, and will definitely reach 1V, or even lower than 1V.

[0045] (4) If the difference is less than the set value (for example, 1V), it means that the voltage difference is too small. It is necessary to increase the difference between the battery module corresponding to the minimum voltage and the average value of the remaining battery modules. The strategy is to isolate the main battery module corresponding to the minimum voltage and charge the remaining 4 main battery modules. In the subsequent charging process, it is assumed that time t has passed. Because the battery module corresponding to the minimum voltage needs to be isolated, the charging time of the battery module corresponding to the minimum voltage must be 0. Because the application strategy is 5 out of 4, the main battery module corresponding to the minimum voltage is not selected. The remaining 4 main battery modules must all be selected to meet the 5 out of 4 requirement. That is, the charging time of the other battery modules must be t. The difference between the main battery module corresponding to the minimum voltage and the remaining main battery modules will definitely increase and will definitely reach 1V, or even higher than 1V.

[0046] Repeat steps (1)(2)(3)(4) repeatedly. The voltage difference between the main battery module corresponding to the minimum voltage and the other main battery modules must be dynamically stabilized at around the set value (1V).

[0047] For 5 main battery modules with inconsistent initial conditions, when connected to the system, the voltage difference may not be the ideal setting value (1V) at the beginning, but after a period of time or several charging and discharging cycles, the voltage difference must be close to the setting value (1V). Figure 1 shown.

[0048] Specifically, in S2, if the voltage difference is greater than a preset threshold, n-1 main battery modules are selected in the serial direction for reconstruction. The purpose of reconstruction is to find a combination of battery modules that meets the bus voltage to meet the output bus voltage requirements. The reconstruction process specifically includes the following steps:

[0049] S21: The battery module selection starts. Based on the bus requirements, all battery modules are numbered as i, and the voltage value of each battery module is collected. All battery modules are arranged in descending order according to the voltage value, and the battery module corresponding to the highest voltage value is numbered as 0. The battery modules are numbered in order of voltage value as i=0, i=1, i=2, ..., i=10;

[0050] S22: Select the battery module corresponding to the highest voltage value, i.e., i=0;

[0051] S23: Determine whether the serial number i of the selected battery module is less than the total number N of battery modules connected in series. If the determination result is yes, accumulate the voltage values ​​corresponding to the selected battery modules to determine whether the voltage accumulation value ∑vi of the battery modules is within a preset range.

[0052] S24: Perform i++ operation according to the voltage accumulation value ∑vi of the battery module, and repeat S22 to S23 until the output bus voltage meets the preset range requirement. The calculated accumulation value of the battery module is the output bus voltage.

[0053] In S23, it is determined whether the voltage accumulation value ∑vi of the battery module is within a preset range. The determination step specifically includes:

[0054] S231: Compare the voltage accumulation value Σvi of the battery module with the bus voltage modulation output lower limit value V1 to determine whether the voltage accumulation value Σvi of the battery module is less than the bus voltage modulation output lower limit value V1. If the determination result is yes, jump to S232; otherwise, jump to S233;

[0055] S232: Based on the result of S231 being judged as yes, the battery module selected this time is placed in the switch-on group, and the voltage value corresponding to the battery module is accumulated into the voltage accumulation value, and then an i++ operation is performed, and S22 to S23 are repeated;

[0056] S233: Compare the cumulative voltage value ∑vi of the battery modules with the upper limit value V2 of the bus voltage modulation output to determine whether the cumulative voltage value ∑vi of the battery modules is greater than the upper limit value V2 of the bus voltage modulation output. If the judgment result is yes, jump to S234; if the judgment result is no, issue instructions for the switch-on group and the switch-bypass group, complete the serial reconstruction operation, and end the selection of the battery modules.

[0057] S234: Based on the result of S233 being yes, place the battery modules accumulated this time into the switch-bypass group, and do not accumulate the voltage values corresponding to the battery modules selected this time into the cumulative voltage value, and perform the i++ operation, and repeat S22 - S23.

[0058] Specifically, the lower limit value V1 of the bus voltage modulation output = 57.4V, and the upper limit value V2 of the bus voltage modulation output = 58.4V. Compare the cumulative voltage value ∑vi of the battery modules with V1. If the cumulative voltage value ∑vi < V1, place the battery modules selected this time into the switch-on group, and accumulate the voltage values corresponding to the battery modules into the cumulative voltage value, which is equivalent to marking the battery modules, continue to select other battery modules for judgment, that is, perform the i++ calculation, and repeat S22 - S23 to select multiple battery modules for combination.

[0059] If the cumulative voltage value ∑vi is not greater than V1, jump to S233, that is, compare this cumulative voltage value ∑vi with the upper limit value V2 of the bus voltage modulation output. If ∑vi > V2, place the battery modules accumulated (selected) this time into the switch-bypass group, and do not accumulate the voltage values corresponding to the battery modules selected this time into the cumulative voltage value, that is, the battery modules selected this time are invalid (do not meet the requirements), and then perform the i++ operation, select the next battery module, and repeat S22 - S23 to select a combination of battery modules that meet the requirements.

[0060] If ∑vi is not greater than V2, it means that the selected battery modules meet the requirements, then issue instructions for the switch-on group and the switch-bypass group, complete the serial reconstruction operation, and end the selection of the battery modules. The output modulation voltage is between 57.4V and 58.4V, as Figure 4 shown.

[0061] In S23, judge whether the serial number i of the selected battery module is less than the total number N of the series-connected battery modules. If the judgment result is no, jump to S25;

[0062] S25: Judge whether all the selection combinations of the battery modules have been tried. If the judgment is yes, jump to step S26; if the judgment is no, mask one main battery module, and repeat S22 - S24, where the battery modules include main battery modules and pseudo-battery modules;

[0063] S26: Keep the last selection result, or disconnect the network cards of all battery modules, and start the mechanism of actively generating the voltage difference between the battery modules.

[0064] Specifically, in S25, it is determined whether all selection combinations of all battery modules have been tried, which can be understood as two situations:

[0065] The first case is that no battery module is placed in the switch bypass group, and all battery modules have been judged by the voltage accumulation value, and still no combination of battery modules that meets the requirements has been found. In this case, all battery modules in S25 have been tried in combination, that is, the judgment in S25 is yes. If the judgment is yes, the last selection result is maintained, or the network cards of all battery modules are disconnected, that is, all battery modules are not connected, and then the mechanism of actively generating a voltage difference between battery modules is started, that is, S1~S2, to re-select a combination of battery modules that meets the requirements, that is, jump to S26.

[0066] The second situation is that a battery module is placed in the switch bypass group. In this case, not all selection combinations in S25 are tried, that is, the judgment in S25 is no. If the judgment result is no, a main battery module is shielded, that is, the main battery module with i=0 is shielded, and a new round of selection is started, that is, re-selection starts from i=1.

[0067] It should be noted that when shielding a main battery module, each main battery module may be shielded once, mainly to try combinations until a satisfactory combination that meets the requirements is found.

[0068] Dynamic reconstruction scenario 1 is introduced as follows:

[0069] like Figure 5 As shown, the energy control unit calculates according to the strategy that battery modules 1, 2, 3, 4, 6, 8, and 10 meet the access conditions, while battery modules 5, 7, and 9 do not meet the access conditions. Battery modules 1, 2, 3, 4, 6, 8, and 10 that meet the access conditions are connected to the system loop, and battery modules 5, 7, and 9 are isolated from the system loop. At this time, the output BUS voltage meets the required bus voltage.

[0070] Dynamic reconstruction scenario 2 is described as follows:

[0071] like Figure 6 As shown, the energy control unit calculates according to the strategy that battery modules 1, 2, 4, 5, 7, 8, and 9 meet the access conditions, while battery modules 3, 6, and 10 do not meet the access conditions. Battery modules 1, 2, 4, 5, 7, 8, and 9 that meet the access conditions are connected to the system loop, and battery modules 3, 6, and 10 are isolated from the system loop. At this time, the output BUS voltage meets the required bus voltage.

[0072] Dynamic reconstruction scenario three is described as follows:

[0073] like Figure 7 As shown, in the shutdown state, when the energy control unit receives a shutdown command, or the battery does not meet the voltage output requirement, all battery modules are turned off, the bus is disconnected, and there is no voltage output.

[0074] Among them, the battery modules marked in red are isolated and not connected to the main circuit; the battery modules marked in blue are working normally and are connected to the main circuit.

[0075] Furthermore, in S2, the specific steps of bypassing the battery module corresponding to the minimum voltage value include:

[0076] S27: The energy control unit generates a control instruction based on the minimum voltage value, and sends the control instruction to the energy exchange unit;

[0077] S28: The energy exchange unit serves as a bridge unit for the power circuit of each battery module, and is used to receive control instructions sent by the energy control unit, and control the state of the corresponding single battery module according to the received control instructions, and the state includes shutdown, isolation, and connection. Figure 2 , which is a schematic diagram of the energy exchange unit as a bridge unit for the power circuit of each battery module.

[0078] Further, the control instructions include 0, 1, and 2; wherein:

[0079] 0 represents a battery module disconnection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to disconnect. At this time, the power circuit corresponding to the battery module is disconnected;

[0080] 1 represents a battery module connection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be connected. At this time, the power circuit corresponding to the battery module is connected;

[0081] 2 represents the battery module isolation instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be bypassed, and the power circuit corresponding to the battery module is connected.

[0082] Furthermore, the control instruction is generated based on real-time calculation of the reconstruction cycle, and the reconstruction cycle can be as fast as 100 milliseconds.

[0083] The discharge process includes the following steps:

[0084] The energy control unit collects the voltage values ​​of n main battery modules and compares all the voltage values ​​to obtain the lowest voltage value;

[0085] The lowest voltage value in the main circuit is calculated by difference with the other voltage values ​​to obtain the voltage difference. If the voltage difference is greater than the preset threshold, the n-1 battery modules in the main circuit are reconstructed in the serial direction; if the voltage difference is not greater than the preset threshold, the main battery module q corresponding to the highest voltage value is forcibly connected, and nq-1 main battery modules are selected from the remaining main battery modules nq for discharge, that is, after forcibly connecting the main battery module q corresponding to the highest voltage value, the main battery module corresponding to the highest voltage value is removed from the n main battery modules, and then one main battery module is removed from the remaining four main battery modules for discharge. Assuming there are 5 main battery modules, after removing the battery module corresponding to the highest voltage value, and then removing one main battery module, it is equivalent to having 3 main battery modules remaining, and these three main battery modules are discharged.

[0086] Specifically, in this embodiment, the strategy of the discharge stage is: there are 5 main battery modules, each with a voltage of 12V, and 5 pseudo battery modules, each with a voltage of 2V. The voltage difference is obtained by calculating the difference between the lowest voltage value in the main circuit and the remaining voltage values. If the voltage difference is greater than the preset threshold, 4 main battery modules are selected from the 5 main battery modules in the serial direction for reconstruction; if the voltage difference is not greater than the preset threshold, the main battery module corresponding to the highest voltage value is forcibly connected and set to q. After the main battery module corresponding to the highest voltage value is connected, the battery module q corresponding to the highest voltage value is removed, and then 3 main battery modules are selected from the remaining 4 main battery modules for discharge.

[0087] During the discharge process, the output voltage range is 57.4V to 58.4V; during the discharge process, the adjustable range of the voltage is small, and the output voltage range is preferably between 57.4V and 58.4V, and then the voltage difference can be guaranteed to be within 0.8V to 1.2V. During the discharge process, the 4 main battery modules and 5 pseudo battery modules corresponding to the highest voltage value are connected to the system to ensure that most of the battery modules can be serially reconstructed and discharged evenly. The discharge principle is consistent with the charging principle, and will not be repeated in the present invention.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system, characterized in that: The charging process includes the following steps: S1: Based on the bus requirements, the energy control unit collects the voltage value of the battery module and compares all the collected voltage values ​​to obtain the minimum voltage value; the battery module includes n main battery modules and m pseudo battery modules; S2: Calculate the difference between the minimum voltage value and other voltage values ​​to obtain the voltage difference; if the voltage difference is greater than the preset threshold, select n-1 main battery modules in the serial direction for reconstruction; if the voltage difference is not greater than the preset threshold, bypass the main battery module p corresponding to the minimum voltage value, and the remaining main battery modules are charged normally.

2. According to claim 1, a method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system is characterized in that: In S2, the specific steps of bypassing the battery module corresponding to the minimum voltage value include: S27: The energy control unit generates a control instruction based on the minimum voltage value, and sends the control instruction to the energy exchange unit; S28: The energy exchange unit serves as a bridge unit for the power circuit of each battery module, and is used to receive control instructions sent by the energy control unit, and control the state of the corresponding single battery module according to the received control instructions, and the state includes shutdown, isolation, and connection.

3. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 2, characterized in that: The control instructions include 0, 1, and 2; wherein: 0 represents a battery module disconnection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to disconnect. At this time, the power circuit corresponding to the battery module is disconnected; 1 represents a battery module connection instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be connected. At this time, the power circuit corresponding to the battery module is connected; 2 represents the battery module isolation instruction. When the energy exchange unit receives the instruction, it controls the battery module corresponding to the energy control unit to be bypassed, and the power circuit corresponding to the battery module is connected.

4. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 1, characterized in that: During the charging process, the output voltage is required to be within 2V lower than the bus voltage.

5. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 2, characterized in that: The control instructions are generated based on real-time calculations during the reconstruction period.

6. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 1, characterized in that: The discharge process includes the following steps: The energy control unit collects the voltage values ​​of n main battery modules and compares all the voltage values ​​to obtain the lowest voltage value; The difference between the lowest voltage value in the main circuit and the remaining voltage values ​​is calculated to obtain the voltage difference. If the voltage difference is greater than the preset threshold, the n-1 battery modules in the main circuit are reconstructed in the serial direction; if the voltage difference is not greater than the preset threshold, the main battery module q corresponding to the lowest voltage value is forcibly connected, and nq-1 main battery modules are selected from the remaining main battery modules nq for discharge.

7. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 6, characterized in that: During the discharge process, the output voltage ranges from 57.4V to 58.4V.

8. The method for actively generating a pressure difference between modules in a serial dynamic reconfiguration battery system according to claim 6, characterized in that: During the discharge process, the voltage difference is guaranteed to be within 0.8V~1V.

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