Battery system, charging equalization control method and apparatus, discharging equalization control method and apparatus, and device and medium

Abstract

The present application relates to the technical field of energy storage devices, and particularly relates to a battery system, a charging equalization control method and apparatus, a discharging equalization control method and apparatus, and a device and a medium. In the charging equalization control method for a battery system, screening is performed on the basis of a first state-of-charge sorting result and a first power sorting result to determine battery modules to be adjusted, and charging current adjustment parameters for bidirectional DCDC power modules to be adjusted are determined, such that the charging power of said bidirectional DCDC power modules is adjusted on the basis of the charging current adjustment parameters, thereby achieving energy equalization control during a charging process of battery modules. Moreover, the discharging equalization control method is used, screening is performed on the basis of a second state-of-charge sorting result and a second power sorting result to determine bidirectional DCDC power modules to be adjusted, and discharging current adjustment parameters for said bidirectional DCDC power modules are determined, such that the discharging power of said bidirectional DCDC power modules is adjusted on the basis of the discharging power adjustment parameters, thereby achieving energy equalization control during a discharging process of battery modules.

Description

Battery system and charging and discharging equalization control method, device, equipment and medium

[0001] The present application is based on the Chinese invention application with the application number 202410830091.5 and the name "Charging and discharging equalization control method of power supply system and battery system" filed on June 25, 2024, and claims priority thereto. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage devices, in particular to a battery system and a charging and discharging equalization control method, device, equipment and medium. BACKGROUND

[0003] The existing BMS (Battery Management System) board of the battery system has low cost, but the scheme needs a complex parallel strategy to ensure the reliability and stability of the system. The internal resistance of the battery cell, the line loss, the voltage difference between different battery modules, and the discrete nature of the running aging will increase, which will lead to the unbalance of the charging and discharging current when multiple battery modules are connected in parallel for use. The energy of each battery module cannot be balanced during the charging and discharging process, which will cause the charging and discharging capacity of different battery modules to be different, which will further exacerbate the discrete nature of the battery internal resistance and the battery life, and ultimately affect the service life of a single battery module.

[0004] SUMMARY

[0005] The present application provides a battery system and a charging and discharging equalization control method, device, equipment and medium to solve the problem that the energy of each battery module cannot be balanced during the charging and discharging process in the prior art.

[0006] In a first aspect, the present application provides a charging equalization control method of a battery system, which comprises:

[0007] Obtaining the current capacity value of each battery module and the corresponding bidirectional DCDC power supply module charging power in the constant current charging phase and / or the constant voltage charging phase;

[0008] According to the current capacity value of each battery module, the battery modules are sorted to obtain a first capacity sorting result, and according to the bidirectional DCDC power supply module charging power of each battery module, the battery modules are sorted to obtain a first power sorting result;

[0009] According to the first power sorting result and the first power sorting result, a to-be-adjusted bidirectional DCDC power module is screened out, and a charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the charging power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter.

[0010] In a second aspect, the application provides a discharge equalization control method of a battery system, the discharge equalization control method of the battery system comprising:

[0011] Obtaining the power value of each battery module and the corresponding bidirectional DCDC power module discharge power;

[0012] According to the power value of each battery module, each battery module is sorted to obtain a second power sorting result, and according to the bidirectional DCDC power module discharge power of each battery module, each battery module is sorted to obtain a second power sorting result;

[0013] According to the second power sorting result and the second power sorting result, a to-be-adjusted bidirectional DCDC power module is screened out, and a discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the discharge power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the discharge power adjustment parameter.

[0014] In a third aspect, the application provides a battery system, comprising: a master control module, a power bus, a system bus and at least one battery module;

[0015] The signal input end of the master control module is connected to the signal output end of the power bus, the power end of the battery module is connected to the power end of an external device through the power bus, the master control module manages each battery module through the system bus, the master control module is connected to the control signal output end of the energy storage converter through the uplink communication bus, and the battery module is composed of a battery cell and a BMS board with a built-in bidirectional DCDC power module;

[0016] The master control module is used to execute the following battery system charging equalization control method, comprising:

[0017] Obtaining the current power value of each battery module in the constant current charging phase and / or the constant voltage charging phase and the corresponding bidirectional DCDC power module charging power;

[0018] According to the current power value of each battery module, each battery module is sorted to obtain a first power sorting result, and according to the bidirectional DCDC power module charging power of each battery module, each battery module is sorted to obtain a first power sorting result;

[0019] According to the first power sorting result and the first power sorting result, a to-be-adjusted bidirectional DCDC power module is screened out, and a charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the charging power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter.

[0020] The master module is configured to perform a discharge equalization control method of the battery system, including:

[0021] The master module is configured to perform a discharge equalization control method of the battery system, including:

[0022] The master module is configured to perform a discharge equalization control method of the battery system, including:

[0023] According to the first power sorting result and the first power sorting result, a to-be-adjusted bidirectional DCDC power module is screened out, and a charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the charging power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter.

[0024] In a fourth aspect, the present application provides a charging equalization control device of a battery system, including:

[0025] The first data acquisition module is configured to acquire current power values of each battery module and corresponding bidirectional DCDC power module charging powers in a constant-current charging phase and / or a constant-voltage charging phase.

[0026] The first power comparison module is configured to sort each battery module according to the current power value of each battery module to obtain a first power sorting result, and sort each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result.

[0027] The first power adjustment module is configured to screen out a to-be-adjusted bidirectional DCDC power module according to the first power sorting result and the first power sorting result, and determine a charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power module according to the charging current adjustment parameter.

[0028] In a fifth aspect, the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following charging equalization control method of the battery system when executing the computer program:

[0029] obtain current power values of each battery module in the constant current charging phase and / or the constant voltage charging phase and corresponding bidirectional DCDC power module charging powers;

[0030] sort each battery module according to the current power value of each battery module to obtain a first power sorting result, and sort each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result;

[0031] According to the first power sorting result and the first power sorting result, the bidirectional DCDC power module to be adjusted is screened out, and the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted is determined, so that the charging power of the bidirectional DCDC power module to be adjusted is adjusted according to the charging current adjustment parameter.

[0032] In a sixth aspect, the present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, wherein the computer program is executed by a processor to realize the following battery system charging equalization control method:

[0033] obtain current power values of each battery module in the constant current charging phase and / or the constant voltage charging phase and corresponding bidirectional DCDC power module charging powers;

[0034] sort each battery module according to the current power value of each battery module to obtain a first power sorting result, and sort each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result;

[0035] According to the first power sorting result and the first power sorting result, the bidirectional DCDC power module to be adjusted is screened out, and the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted is determined, so that the charging power of the bidirectional DCDC power module to be adjusted is adjusted according to the charging current adjustment parameter.

[0036] In a seventh aspect, the present application provides a battery system charging equalization control device, wherein the charging equalization control device comprises:

[0037] a second data acquisition module, configured to obtain power values of each battery module and corresponding bidirectional DCDC power module discharging powers;

[0038] a second power comparison module, configured to sort each of the battery modules according to the power values of the battery modules to obtain a second power value sorting result, and sort each of the battery modules according to the discharging powers of the bidirectional DCDC power modules of the battery modules to obtain a second power sorting result;

[0039] a second power adjustment module, configured to screen out to-be-adjusted bidirectional DCDC power modules according to the second power value sorting result and the second power sorting result, determine discharging power adjustment parameters of each of the to-be-adjusted bidirectional DCDC power modules, and adjust the discharging powers of the to-be-adjusted bidirectional DCDC power modules according to the discharging power adjustment parameters.

[0040] In an eighth aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the discharging equalization control method of the battery system when executing the computer program.

[0041] obtaining power values of each of the battery modules and corresponding discharging powers of bidirectional DCDC power modules of the battery modules;

[0042] sorting each of the battery modules according to the power values of the battery modules to obtain a second power value sorting result, and sorting each of the battery modules according to the discharging powers of the bidirectional DCDC power modules of the battery modules to obtain a second power sorting result;

[0043] screening out to-be-adjusted bidirectional DCDC power modules according to the second power value sorting result and the second power sorting result, determining discharging power adjustment parameters of each of the to-be-adjusted bidirectional DCDC power modules, and adjusting the discharging powers of the to-be-adjusted bidirectional DCDC power modules according to the discharging power adjustment parameters.

[0044] In a ninth aspect, the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement the discharging equalization control method of the battery system.

[0045] obtaining power values of each of the battery modules and corresponding discharging powers of bidirectional DCDC power modules of the battery modules;

[0046] sorting each of the battery modules according to the power values of the battery modules to obtain a second power value sorting result, and sorting each of the battery modules according to the discharging powers of the bidirectional DCDC power modules of the battery modules to obtain a second power sorting result;

[0047] According to the second electric quantity sorting result and the second power sorting result, a to-be-adjusted bidirectional DCDC power module is screened out, and a discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the discharge power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the discharge power adjustment parameter.

[0048] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0049] The power supply system and the charging and discharging equalization control method, device, equipment and medium provided by the present application screen out a to-be-adjusted battery module according to a first electric quantity sorting result and a first power sorting result, determine a charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module, and adjust the charging power of the to-be-adjusted bidirectional DCDC power module according to the charging current adjustment parameter, thereby realizing energy equalization control in the charging process of each battery module. In addition, the discharging equalization control method provided by the present application screens out a to-be-adjusted bidirectional DCDC power module according to a second electric quantity sorting result and a second power sorting result, determines a discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module, and adjusts the discharge power of the to-be-adjusted bidirectional DCDC power module according to the discharge power adjustment parameter, thereby realizing energy equalization control in the discharging process of each battery module. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0051] FIG. 1 is a structural schematic diagram of a battery system according to an embodiment of the present application;

[0052] FIG. 2 is a flowchart of a charging equalization control method of a battery system according to an embodiment of the present application;

[0053] FIG. 3 is another flowchart of a charging equalization control method of a battery system according to an embodiment of the present application;

[0054] FIG. 4 is a flowchart of a discharging equalization control method of a battery system according to an embodiment of the present application;

[0055] FIG. 5 is a schematic diagram of a charging equalization control device of a battery system according to an embodiment of the present application;

[0056] FIG. 6 is a schematic diagram of another charging equalization control device of a battery system according to an embodiment of the present application;

[0057] FIG. 7 is a schematic diagram of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0059] In a first embodiment, a charging equalization control method of a battery system is provided, which can be applied to a battery system as shown in FIG. 1, wherein the battery system comprises a master control module 01, a power bus 02, a system bus 03 and at least one battery module; referring to FIG. 1, a signal collection input end of the master control module 01 is connected to a signal collection output end of the power bus 02, a power end of the battery module is connected to a power end of an external device through the power bus 02, the master control module 01 manages each battery module through the system bus 03, the master control module 01 is connected to a control signal output end of an energy storage converter 05 through an uplink communication bus 04, and the battery module is composed of a battery cell and a BMS board with a built-in bidirectional DCDC power module, and the master control module 01 is used to execute the charging equalization control method of the battery system.

[0060] As shown in FIG. 1, the charging equalization control method of the battery system can comprise the following steps.

[0061] S101: acquiring current power values of each battery module and corresponding bidirectional DCDC power module charging powers in a constant current charging phase and / or a constant voltage charging phase.

[0062] The master control module 01 acquires the power values of each battery module and the corresponding bidirectional DCDC power module charging powers in the constant current charging phase and / or the constant voltage charging phase.

[0063] S102: sorting each battery module according to the power values of each battery module to obtain a first power sorting result, and sorting each battery module according to the bidirectional DCDC power module charging powers of each battery module to obtain a first power sorting result.

[0064] The master control module 01 sorts each battery module according to the power values of each battery module to obtain a first power sorting result, and sorts each battery module according to the bidirectional DCDC power module charging powers of each battery module to obtain a first power sorting result.

[0065] S103: According to the first power ranking result and the first power ranking result, the to-be-adjusted bidirectional DCDC power module is screened out, and the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power module according to the charging current adjustment parameter.

[0066] The first power ranking result and the corresponding first power ranking result of each battery module are compared to determine whether the first power ranking result and the first power ranking result are consistent. The bidirectional DCDC power module in the battery module with inconsistent first power ranking result and first power ranking result is determined as the to-be-adjusted bidirectional DCDC power module, and the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined according to the first power ranking result and the first power ranking result.

[0067] In practical applications, the charging current of the bidirectional DCDC power module can be increased to increase the charging power of the bidirectional DCDC power module. Specifically, the charging current of the bidirectional DCDC power module can be increased to control the bidirectional DCDC power module to increase the unit charging power on the basis of the original charging power. The charging current of the bidirectional DCDC power module can also be reduced to reduce the charging power of the bidirectional DCDC power module. Specifically, the charging current of the bidirectional DCDC power module can be reduced to control the bidirectional DCDC power module to reduce the unit charging power on the basis of the original charging power. In practical applications, the specific value of the unit charging power of the bidirectional DCDC power module can be determined according to the specific application environment, which is not limited here and can be determined according to the actual application environment, all of which are within the protection scope of the present application.

[0068] After determining the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module, the charging current of each to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter, so as to adjust the charging power of the bidirectional DCDC power module of each battery module by adjusting the charging current of the to-be-adjusted bidirectional DCDC power module. The sorting result of sorting each battery module according to the charging power of each bidirectional DCDC power module is consistent with the sorting result of sorting each battery module according to the power value. In practical applications, it is not limited to this and can be determined according to the specific application environment, all of which are within the protection scope of the present application.

[0069] The battery system charging equalization control method of the embodiment, by obtaining the current power value of each battery module and the corresponding bidirectional DCDC power module charging power in the constant current charging stage and / or the constant voltage charging stage, sorting each battery module according to the power value of each battery module to obtain a first power sorting result, and sorting each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result, screening out the bidirectional DCDC power module to be adjusted according to the first power sorting result and the first power sorting result, determining the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted, and then adjusting the charging power of the bidirectional DCDC power module to be adjusted according to the charging current adjustment parameter, so that multiple battery modules can be charged at the same time, and the energy equalization control in the charging process of each battery module is realized by adjusting the bidirectional DCDC power module charging power of each battery module, the flexibility of the battery system is improved, and the reliability and service life of the battery system are improved.

[0070] On the basis of the above embodiment, as shown in FIG. 3, in the pre-charging stage of each power module, the battery system charging equalization control method further comprises:

[0071] S201: Obtain the real-time power bus voltage, and judge whether the power bus voltage is in the preset linear adjustment range.

[0072] Specifically, the lower limit of the preset linear adjustment range is the preset stop charging voltage Umin, and the upper limit of the preset linear adjustment range is the preset maximum peak power charging voltage Umax. Here, no specific limitation is made, which can be determined according to the actual application environment, and is within the protection scope of the present application.

[0073] In actual application, if the power bus 02 voltage is in the preset linear adjustment range, step S202 is executed; if the power bus 02 voltage is less than the preset stop charging voltage, step S203 is executed; if the power bus 02 voltage is greater than the preset maximum peak power charging voltage, step S204 is executed.

[0074] S202: Linearly calculate the maximum power output by each battery module according to the power bus voltage to obtain the initial bidirectional DCDC power module charging power of each battery module.

[0075] If the power bus 02 voltage is in the preset linear adjustment range, the maximum power output by each battery module is linearly calculated according to the power bus 02 voltage to obtain the initial bidirectional DCDC power module charging power of each battery module, and each battery module is set to output according to the initial bidirectional DCDC power module charging power.

[0076] In actual application, if the bidirectional DCDC power module detects that the current power bus voltage is U, the initial charging power of the bidirectional DCDC power module of the current battery module is P=Pmax*(U-Umin) / (Umax-Umin), which is not limited to this in actual application, and can be determined according to the specific application environment, and all falls within the protection scope of the present application.

[0077] S203: Each battery module stops charging.

[0078] If the voltage of the power bus 02 is less than the preset stop charging voltage, the control of each battery module stops charging.

[0079] S204: The initial charging power of the bidirectional DCDC power module of each battery module is the maximum power Pmax output by each bidirectional DCDC power module.

[0080] If the voltage of the power bus 02 is greater than the preset maximum peak power charging voltage, the initial charging power of each power module is set to be the maximum power Pmax output by each bidirectional DCDC power module.

[0081] The charging equalization control method of the battery system of the embodiment can linearly calculate the maximum power output by each bidirectional DCDC power module according to the voltage of the power bus 02 when the voltage of the power bus 02 is within the preset linear adjustment range, so as to obtain the initial charging power of the bidirectional DCDC power module of each battery module, so that the power supply capacity of the power bus 02 and the charging power of the bidirectional DCDC power module of the battery module are matched, and the supply-demand balance of the power module in the battery system is realized.

[0082] In the second embodiment, a discharging equalization control method of a battery system is provided, which can be applied to the battery system shown in FIG. 1, wherein the battery system comprises a master control module 01, a power bus 02, a system bus 03 and at least one power module; referring to FIG. 1, the collection signal input end of the master control module 01 is connected to the collection signal output end of the power bus 02, the power end of the battery module is connected to the power end of the external device through the power bus 02, the master control module 01 manages each battery module through the system bus 03, the master control module 01 is connected to the control signal output end of the energy storage converter 05 through the uplink communication bus 04, the battery module is composed of a battery cell and a BMS board with a built-in bidirectional DCDC power module, and the master control module 01 is used to execute the discharging equalization control method of the battery system.

[0083] As shown in FIG. 4, the discharging equalization control method of the battery system can comprise the following steps.

[0084] S301: Obtain the power value of each battery module and the corresponding discharge power of the bidirectional DCDC power module.

[0085] S302: Sort each battery module according to the power value of each battery module to obtain a second power sorting result, and sort each battery module according to the discharge power of the bidirectional DCDC power module to obtain a second power sorting result.

[0086] After the main control module 01 obtains the power value of each battery module and the corresponding discharge power of the bidirectional DCDC power module, the battery module is sorted according to the power value of each battery module to obtain a second power sorting result, and the battery module is sorted according to the discharge power of the bidirectional DCDC power module to obtain a second power sorting result.

[0087] S303: According to the second power sorting result and the second power sorting result, the bidirectional DCDC power module to be adjusted is screened out, and the discharge power adjustment parameter of each bidirectional DCDC power module to be adjusted is determined, so as to adjust the discharge power of the bidirectional DCDC power module to be adjusted according to the discharge power adjustment parameter.

[0088] Compare the second power sorting result of each battery module and the corresponding second power sorting result to determine the bidirectional DCDC power module in the battery module whose second power sorting result and second power sorting result are inconsistent as the bidirectional DCDC power module to be adjusted, and determine the discharge power adjustment parameter of each bidirectional DCDC power module to be adjusted according to the second power sorting result and the second power sorting result.

[0089] In practical application, the discharge current of the bidirectional DCDC power module can be increased to increase the discharge power of the bidirectional DCDC power module. Specifically, the discharge current of the bidirectional DCDC power module can be increased to control the bidirectional DCDC power module to increase the unit discharge power on the basis of the original charging power. The discharge current of the bidirectional DCDC power module can also be reduced to reduce the discharge power of the bidirectional DCDC power module. Specifically, the discharge current of the bidirectional DCDC power module can be reduced to control the bidirectional DCDC power module to reduce the unit charging power on the basis of the original discharge power. In practical application, the specific value of the unit discharge power of the bidirectional DCDC power module can be determined according to the specific application environment, which is not limited here and can be determined according to the actual application environment, which is within the scope of the application.

[0090] After the discharge power adjustment parameters of the to-be-adjusted bidirectional DCDC power supply modules are determined, the discharge power of the to-be-adjusted bidirectional DCDC power supply modules is adjusted according to the discharge power adjustment parameters, so as to adjust the charging power of the bidirectional DCDC power supply modules of each battery module, and make the sorting result of the battery modules sorted according to the charging power of the bidirectional DCDC power supply modules consistent with the sorting result of the battery modules sorted according to the electric quantity values. In actual application, it is not limited to this, but can be determined according to the specific application environment, and all falls within the protection scope of the present application.

[0091] The discharge equalization control method of the battery system of the embodiment is to sort the battery modules according to the electric quantity values of the battery modules after the electric quantity values of the battery modules and the corresponding discharge power of the bidirectional DCDC power supply modules are obtained, to obtain a second electric quantity sorting result, and to sort the battery modules according to the discharge power of the bidirectional DCDC power supply modules of the battery modules, to obtain a second power sorting result, to screen out the to-be-adjusted bidirectional DCDC power supply modules according to the second electric quantity sorting result and the second power sorting result, to determine the discharge power adjustment parameters of the to-be-adjusted bidirectional DCDC power supply modules, and to adjust the discharge power of the to-be-adjusted bidirectional DCDC power supply modules according to the discharge power adjustment parameters, so as to realize the energy equalization control in the discharge process of the battery modules by adjusting the discharge power of the bidirectional DCDC power supply modules of the battery modules, to improve the flexibility of the battery system, and to improve the reliability and service life of the battery system.

[0092] In the third embodiment, the present application provides a battery system as shown in FIG. 1, which comprises a master control module 01, a power bus 02, a system bus 03, and at least one battery module (such as 11, 12,...1n shown in FIG. 1); wherein:

[0093] The signal collection input end of the master control module 01 is connected to the signal collection output end of the power bus 02, the power end of the battery module is connected to the power end of the external device through the power bus 02, the master control module 01 manages each battery module through the system bus 03, the master control module 01 is connected to the control signal output end of the energy storage converter 05 through the uplink communication bus 04, and the battery module is composed of a battery cell and a BMS board with a built-in bidirectional DCDC power supply module.

[0094] Specifically, the uplink communication bus 04 can be a CAN bus or an RS485 bus, which is not limited herein; and the master control module 01 is configured to execute the charge equalization control method of the battery system as described in any one of the first embodiments, and the discharge equalization control method of the battery system as described in any one of the second embodiments. As shown in FIG. 1, the BMS board 06 in each battery module is provided with a corresponding bidirectional DCDC power module 07, so that the master control module 01 can execute the charge equalization control method of the battery system as described in any one of the first embodiments, and the discharge equalization control method of the battery system as described in any one of the second embodiments through the bidirectional DCDC power module 07 on the BMS board 06. In actual applications, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0095] In actual applications, when the battery system is charging, the battery system can obtain the electrical energy provided by the photovoltaic system (e.g., PV shown in FIG. 1) and / or the power grid (e.g., Grid shown in FIG. 1) through the energy storage converter 05 to charge the battery system, and when the battery system is discharging, the battery system can provide electrical energy for the load (e.g., Load shown in FIG. 1) through the energy storage converter 05. In actual applications, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0096] The battery system of the present embodiment can achieve energy equalization control in the charging and discharging process of each battery module by sampling the master control module 01 to execute the charge equalization control method of the battery system as described in the first embodiment, and the discharge equalization control method of the battery system as described in the second embodiment. The master control module 01 can achieve energy equalization control in the charging and discharging process of each battery module by adjusting the charging and discharging power of each battery module, thereby improving the flexibility of the battery system, and further improving the reliability and service life of the battery system. By providing the BMS board 06 including the bidirectional DCDC power module 07 in the battery module to achieve the charge equalization control method as described in the first embodiment, and the discharge equalization control method as described in the second embodiment, the flexibility of the battery system expansion is improved, and the product maintenance cost is reduced.

[0097] Specifically, the master control module is configured to execute the following charge equalization control method of the battery system, comprising:

[0098] obtaining the current power value of each battery module and the corresponding bidirectional DCDC power module charging power in the constant current charging phase and the constant voltage charging phase;

[0099] sorting each battery module according to the current power value of each battery module to obtain a first power sorting result, and sorting each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result;

[0100] According to the first power sorting result and the first power sorting result, the to-be-adjusted bidirectional DCDC power module is screened out, and the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the charging power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter;

[0101] The master control module is used to perform the following discharge equalization control method of the battery system, comprising:

[0102] The power value of each battery module and the corresponding bidirectional DCDC power module discharge power are obtained.

[0103] According to the power value of each battery module, each battery module is sorted to obtain a second power sorting result, and according to the bidirectional DCDC power module discharge power of each battery module, each battery module is sorted to obtain a second power sorting result.

[0104] According to the second power sorting result and the second power sorting result, the to-be-adjusted bidirectional DCDC power module is screened out, and the discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the discharge power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the discharge power adjustment parameter.

[0105] In other embodiments, according to the first power sorting result and the first power sorting result, the to-be-adjusted bidirectional DCDC power module is screened out, and the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so that the charging power of the to-be-adjusted bidirectional DCDC power module is adjusted according to the charging current adjustment parameter.

[0106] Compare whether the first power sorting result of each battery module and the corresponding first power sorting result are consistent;

[0107] The bidirectional DCDC power module in the battery module whose first power sorting result and first power sorting result are inconsistent is determined as the to-be-adjusted bidirectional DCDC power module, and the charging current adjustment parameter is determined according to the first power sorting result and the first power sorting result;

[0108] According to the charging current adjustment parameter, the charging current of the to-be-adjusted bidirectional DCDC power module is adjusted, so that the bidirectional DCDC power module charging power of each battery module is adjusted by adjusting the charging current of the to-be-adjusted bidirectional DCDC power module, so that the sorting result of sorting each battery module according to the bidirectional DCDC power module charging power is consistent with the sorting result of sorting each battery module according to the power value.

[0109] In other embodiments, the method for charge equalization control of the battery system further comprises the following steps performed in a pre-charging phase of each battery module:

[0110] obtaining a real-time power bus voltage, and determining whether the power bus voltage is within a preset linear adjustment range;

[0111] if the power bus voltage is within the preset linear adjustment range, performing linear calculation on the maximum power output by each battery module according to the power bus voltage to obtain an initial bidirectional DCDC power module charging power of each battery module, and setting each battery module to output according to the initial bidirectional DCDC power module charging power.

[0112] In other embodiments, the lower limit of the preset linear adjustment range is a preset stop charging voltage, and the upper limit of the preset linear adjustment range is a preset maximum peak power charging voltage.

[0113] In other embodiments, after the step of obtaining a real-time power bus voltage and determining whether the power bus voltage is within a preset linear adjustment range, the method further comprises:

[0114] if the power bus voltage is less than the preset stop charging voltage, each battery module stops charging.

[0115] In other embodiments, after the step of obtaining a real-time power bus voltage and determining whether the power bus voltage is within a preset linear adjustment range, the method further comprises:

[0116] if the power bus voltage is greater than the preset maximum peak power charging voltage, the initial bidirectional DCDC power module charging power of each battery module is the maximum power output by each bidirectional DCDC power module.

[0117] In other embodiments, according to the second power sorting result and the second power sorting result, the method further comprises the following steps of screening out a bidirectional DCDC power module to be adjusted, and determining a discharge power adjustment parameter of each bidirectional DCDC power module to be adjusted, so as to adjust the discharge power of the bidirectional DCDC power module to be adjusted according to the discharge power adjustment parameter:

[0118] comparing whether the second power sorting result of each battery module and the corresponding second power sorting result are consistent;

[0119] determining that the bidirectional DC / DC power supply module in the battery module which is inconsistent with the second power ranking result is the to-be-adjusted bidirectional DC / DC power supply module, and determining the discharge power adjustment parameter according to the second power ranking result and the second power ranking result;

[0120] adjusting the discharge power of the to-be-adjusted bidirectional DC / DC power supply module in the battery module according to the discharge power adjustment parameter, so that the ranking result of ranking each battery module according to the discharge power of each bidirectional DC / DC power supply module is consistent with the ranking result of ranking each battery module according to the power value.

[0121] In other embodiments, the step of adjusting the discharge power of the to-be-adjusted bidirectional DC / DC power supply module in the battery module according to the discharge power adjustment parameter, so that the ranking result of ranking each battery module according to the discharge power of each bidirectional DC / DC power supply module is consistent with the ranking result of ranking each battery module according to the power value, includes:

[0122] adjusting the discharge current and the discharge voltage of the to-be-adjusted bidirectional DC / DC power supply module according to the discharge power adjustment parameter, so that the ranking result of ranking each battery module according to the discharge power of each bidirectional DC / DC power supply module is consistent with the ranking result of ranking each battery module according to the power value.

[0123] In practical applications, referring to FIG. 1, when each battery module is charging, the master control module 01 can obtain the battery voltage, the power value, the maximum charging current, the cutoff charging voltage and the cutoff charging current in each battery module through the system communication bus 03. The master control module 01 integrates the obtained information into the initial power bus voltage of the battery system (i.e. the voltage value of the energy storage converter 05 starting output to the power bus 02), the total power value of the battery system, and the allowed system maximum charging current and system cutoff charging voltage, and reports them to the energy storage converter 05.

[0124] After receiving the above information, and when the battery system is in the charging mode, the energy storage converter 05 provides output to the power bus 02 according to the initial power bus voltage, and sends a charging start instruction to the master control module 01 through the uplink communication bus 04. Specifically, the charging start instruction includes the maximum peak power charging voltage of the power bus 02 and the stop charging voltage of the power bus 02.

[0125] After the master control module 01 receives the charging start instruction, it successively issues charging instructions to the bidirectional DCDC power module 07 in each battery module according to the battery module's power value from low to high, to control the bidirectional DCDC power module 07 to charge the battery cell. That is, the battery module with low power value starts charging first. In actual application, the charging instruction includes the maximum peak power charging voltage of the power bus 02 and the stop charging voltage of the power bus 02, which is not limited to this in actual application, but can be determined according to the specific application environment, and is within the protection scope of the present application.

[0126] Each bidirectional DCDC power module 07 starts the charging process and dynamically adjusts based on the input and output conditions. After receiving the charging instruction, the bidirectional DCDC power module 07 in the battery module enters the three-section curve charging mode. Specifically, after receiving the charging instruction, the bidirectional DCDC power module 07 in the battery module first performs a small current pre-charge, and then enters constant current charging when the battery cell module voltage is higher than the pre-charge voltage point. When the battery cell voltage rises to the constant voltage charging voltage, it enters constant voltage charging. During the constant voltage charging process, the charging current gradually decreases to the charging cutoff current, and the charging is completed. When all the battery modules are charged, the system charging process is completed, or the master control module 01 can be notified to stop charging when the working conditions of the energy storage converter 05 change. In actual application, it is not limited to this, but can be determined according to the specific application environment, and is within the protection scope of the present application.

[0127] When each bidirectional DCDC power module 07 starts charging, the initial bidirectional DCDC power module charging power output by it is subject to the following constraints: (1) When the power bus 02 voltage is lower than the stop charging voltage, the bidirectional DCDC power module 07 stops charging output; (2) When the power bus 02 voltage is higher than the maximum peak power charging voltage, the initial bidirectional DCDC power module charging power output by the bidirectional DCDC power module 07 is the maximum charging output power within the range allowed by its three-section charging curve charging mode; (3) When the power bus 02 voltage is between the maximum peak power charging voltage and the stop charging voltage, the initial bidirectional DCDC power module charging power of the bidirectional DCDC power module 07 is linearly adjusted from the maximum power to 0. Specifically, the maximum power of the bidirectional DCDC power module 07 is the maximum power output by the bidirectional DCDC power module 07. In actual application, it is not limited to this, but can be determined according to the specific application environment, and is within the protection scope of the present application.

[0128] The master module 01 obtains the power values of each battery module in the constant current charging stage and / or the constant voltage charging stage, and the charging power of the bidirectional DCDC power module 07, then sorts each battery module according to the power value of each battery module to obtain a first power sorting result, and sorts each battery module according to the charging power of the bidirectional DCDC power module 07 of each battery module to obtain a first power sorting result, so as to screen out the bidirectional DCDC power module 07 to be adjusted according to the first power sorting result and the first power sorting result, and determine the charging current adjustment parameter of each bidirectional DCDC power module 07 to be adjusted, and send the corresponding charging current adjustment parameter to the bidirectional DCDC power module 07 in each battery module, so that each bidirectional DCDC power module 07 can adjust the charging power of the bidirectional DCDC power module 07 according to the charging current adjustment parameter, realizing the energy balance control in the battery system charging process.

[0129] In practical application, referring to FIG. 1, when each battery module is discharging, the energy storage converter 05 gives the master module 01 a discharge start instruction through the uplink communication bus 04 under the condition that the battery system is in the discharging mode and the battery module still has power supply capability. Specifically, the discharge start instruction contains the maximum voltage of the power bus and the minimum voltage of the power bus. The maximum voltage of the power bus is the highest voltage output from the battery system to the power bus 02 when the power value of the battery system is 100%, and the minimum voltage of the power bus is the voltage output from the battery system to the power bus 02 when the power value of the battery system is 0%. In practical application, the energy storage converter 05 does not perform inversion conversion when the voltage of the power bus 02 is lower than the minimum voltage of the power bus. In practical application, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0130] After the master module 01 receives the discharge starting instruction, it sequentially issues discharge instructions to the bidirectional DCDC power module 07 in each battery module according to the battery capacity value from high to low, to control the battery cell to discharge through the bidirectional DCDC power module 07. That is, the battery module with high capacity value starts discharging first. In actual application, the discharge instruction contains the maximum voltage Umax of the power bus, the minimum voltage Umin of the power bus, and the current output voltage Unow of the power bus. Specifically, the current output voltage of the power bus can be linearly calculated according to the available capacity value of the battery system. For example, assuming that the maximum voltage of the power bus is Umax, the maximum available capacity value of the battery system is Nmax, when the available capacity value of the battery system is 100% Nmax, the current output voltage of the power bus is 100% Umax, when the available capacity value of the battery system is 0% Nmax, the current output voltage of the power bus is Umin; when the available capacity value of the battery system is other capacity value, the current output voltage Unow = Umin + Nnow*(Umax-Umin) / Nmax. In actual application, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0131] Each bidirectional DCDC power module 07 starts the discharge process and dynamically adjusts based on input and output conditions. After receiving the discharge instruction, the bidirectional DCDC power module 07 in the battery module enters the discharge working mode. In actual application, the bidirectional DCDC power module 07 discharges in accordance with the following constraints: (1) no overvoltage, that is, the output voltage of each bidirectional DCDC power module 07 is not greater than the maximum voltage of the power bus 02; (2) no undervoltage, that is, the output voltage of each bidirectional DCDC power module 07 is not less than the minimum voltage of the power bus 02; (3) no overcurrent, that is, the output current of each bidirectional DCDC power module 07 does not exceed the rated power requirement of the battery module itself; (4) the current output by each bidirectional DCDC power module 07 is not negative. In actual application, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0132] After the discharging starts, the main control module 01 acquires the power values of the battery modules and the discharging power of the bidirectional DCDC power supply modules 07, then sorts the battery modules according to the power values of the battery modules to obtain a second power sorting result, and sorts the battery modules according to the discharging power of the bidirectional DCDC power supply modules 07 to obtain a second power sorting result, so as to screen out the bidirectional DCDC power supply modules 07 to be adjusted according to the second power sorting result and the second power sorting result, determine the discharging power adjustment parameters of each bidirectional DCDC power supply module 07 to be adjusted, and send the corresponding discharging power adjustment parameters to the bidirectional DCDC power supply modules 07 in each battery module, so that each bidirectional DCDC power supply module 07 can adjust the discharging power output according to the discharging power adjustment parameters, and the energy balance control in the discharging process of each battery module is realized.

[0133] In actual application, when the power value of the battery system is lower than the preset value or the working condition of the energy storage converter 05 changes, each bidirectional DCDC power supply module 07 stops discharging. That is, when the power value of any battery module is lower than the preset value, each bidirectional DCDC power supply module 07 stops discharging, or when the working condition of the energy storage converter 05 changes, the energy storage converter 05 notifies the main control module 01 in advance to control each bidirectional DCDC power supply module 07 to stop discharging. In actual application, it is not limited to this, but can be determined according to the specific application environment, which is within the protection scope of the present application.

[0134] In the fourth embodiment, as shown in FIG. 5, the present application provides a charging balance control device of a battery system, wherein the charging balance control device comprises:

[0135] The first data acquisition module 51 is configured to acquire the current power values of the battery modules and the corresponding bidirectional DCDC power supply module charging power in the constant current charging phase and / or the constant voltage charging phase.

[0136] The first power comparison module 52 is configured to sort the battery modules according to the current power values of the battery modules to obtain a first power sorting result, and sort the battery modules according to the bidirectional DCDC power supply module charging power of the battery modules to obtain a first power sorting result.

[0137] The first power adjustment module 53 is configured to screen out the bidirectional DCDC power supply modules to be adjusted according to the first power sorting result and the first power sorting result, and determine the charging current adjustment parameters of each bidirectional DCDC power supply module to be adjusted, so as to adjust the charging power of the bidirectional DCDC power supply module to be adjusted according to the charging current adjustment parameters.

[0138] In other embodiments, the first power adjustment module comprises:

[0139] The sorting result comparison unit is configured to compare whether the first power sorting result of each battery module is consistent with the first power sorting result corresponding to the first power sorting result.

[0140] The adjustment parameter determination unit is configured to determine that the bidirectional DCDC power module in the battery module, for which the first power sorting result is inconsistent with the first power sorting result, is the to-be-adjusted bidirectional DCDC power module, and determine the charging current adjustment parameter according to the first power sorting result and the first power sorting result.

[0141] The power adjustment unit is configured to adjust the charging current of the to-be-adjusted bidirectional DCDC power module according to the charging current adjustment parameter, so as to adjust the charging power of the bidirectional DCDC power module of each battery module by adjusting the charging current of the to-be-adjusted bidirectional DCDC power module, and make the sorting result of sorting each battery module according to the bidirectional DCDC power module charging power consistent with the sorting result of sorting each battery module according to the power value.

[0142] In other embodiments, the charging equalization control device comprises:

[0143] The voltage determination module is configured to obtain a real-time power bus voltage, and determine whether the power bus voltage is within a preset linear adjustment range.

[0144] The charging power control module is configured to, when the power bus voltage is within the preset linear adjustment range, linearly calculate the maximum power output by each battery module according to the power bus voltage, to obtain an initial bidirectional DCDC power module charging power of each battery module, and set each battery module to output according to the initial bidirectional DCDC power module charging power.

[0145] In other embodiments, the lower limit of the preset linear adjustment range is a preset stop charging voltage, and the upper limit of the preset linear adjustment range is a preset maximum peak power charging voltage.

[0146] In other embodiments, the power adjustment unit is further configured to, when it is determined that the power bus voltage is less than the preset stop charging voltage, control each battery module to stop charging.

[0147] In other embodiments, the power adjustment unit is further configured to, when it is determined that the power bus voltage is greater than the preset maximum peak power charging voltage, control the initial bidirectional DCDC power module charging power of each battery module to be the maximum power output by each bidirectional DCDC power module.

[0148] The specific limitations of the charge equalization control device can refer to the limitations of the charge equalization control method described above, which will not be repeated here. Each module in the above charge equalization control device can be realized by software, hardware, and a combination thereof, in whole or in part. The above modules can be embedded in or independent of the processor in the computer device in hardware form, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0149] In a fifth embodiment, as shown in FIG. 6, the present application provides a discharge equalization control device of a battery system, wherein the discharge equalization control device comprises:

[0150] A second data acquisition module 61 is configured to acquire the power values of each battery module and the corresponding discharge power of the bidirectional DCDC power supply module;

[0151] A second power comparison module 62 is configured to sort each battery module according to the power value of each battery module to obtain a second power sorting result, and sort each battery module according to the discharge power of the bidirectional DCDC power supply module of each battery module to obtain a second power sorting result;

[0152] A second power adjustment module 63 is configured to filter out the bidirectional DCDC power supply module to be adjusted according to the second power sorting result and the second power sorting result, and determine the discharge power adjustment parameter of each bidirectional DCDC power supply module to be adjusted, so as to adjust the discharge power of the bidirectional DCDC power supply module to be adjusted according to the discharge power adjustment parameter.

[0153] In other embodiments, the second power adjustment module comprises:

[0154] A power comparison unit is configured to compare whether the second power sorting result of each battery module and the corresponding second power sorting result are consistent;

[0155] An adjustment parameter determination unit is configured to determine the bidirectional DCDC power supply module in the battery module whose second power sorting result and second power sorting result are inconsistent as the bidirectional DCDC power supply module to be adjusted, and determine the discharge power adjustment parameter according to the second power sorting result and the second power sorting result;

[0156] A discharge power determination unit is configured to adjust the discharge power of the bidirectional DCDC power supply module to be adjusted in the battery module according to the discharge power adjustment parameter, so as to make the sorting result of sorting each battery module according to the discharge power of each bidirectional DCDC power supply module consistent with the sorting result of sorting each battery module according to the power value by adjusting the discharge power of the bidirectional DCDC power supply module of each battery module.

[0157] In other embodiments, the discharge power determination unit is specifically configured to: adjust the discharge current and the discharge voltage of the to-be-adjusted bidirectional DCDC power supply modules according to the discharge power adjustment parameter, so as to make the sorting result of sorting each battery module according to the charging power of each bidirectional DCDC power supply module consistent with the sorting result of sorting each battery module according to the power value, by adjusting the discharge current and the discharge voltage of each to-be-adjusted bidirectional DCDC power supply module.

[0158] The specific limitations of the discharge balancing control device can refer to the limitations of the discharge balancing control method described above, which will not be repeated here. Each module in the discharge balancing control device described above can be implemented by software, hardware, and combinations thereof, in whole or in part. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0159] In a sixth embodiment, FIG. 7 is a structural schematic diagram of a computer device according to an embodiment of the present application. As shown in FIG. 7, the computer device of this embodiment includes at least one processor (only one is shown in FIG. 5), a memory, and a computer program stored in the memory and executable on the at least one processor, and the processor executes the computer program to implement the steps of the first embodiment and / or the second embodiment described above.

[0160] The computer device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that FIG. 7 is only an example of the computer device, and does not limit the computer device. The computer device can include more or fewer components than shown, or combine certain components, or different components, for example, it can also include a network interface, a display screen, and an input device, etc.

[0161] The processor can be a CPU, and the processor can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0162] The memory includes a readable storage medium, an internal memory, etc., wherein the internal memory can be a memory of the computer device, and the internal memory provides an environment for running of the operating system and the computer-readable instructions in the readable storage medium. The readable storage medium can be a hard disk of the computer device, and in other embodiments, can also be an external storage device of the computer device, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. Further, the memory can include both an internal storage unit of the computer device and an external storage device. The memory is used to store an operating system, an application program, a BootLoader, data, and other programs, such as program codes of computer programs, etc. The memory can also be used to temporarily store data that has been output or will be output.

[0163] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the above-described functions. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the unit and module in the above device can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here. If the integrated unit is realized in the form of software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the present application realizes all or part of the processes in the above-mentioned embodiment methods, which can be realized by a computer program to instruct related hardware to complete, and the computer program can be stored in a computer readable storage medium. The computer program includes computer program code, which can be in the form of source code, object code, executable file or some intermediate form. The computer readable medium at least includes any entity or device capable of carrying computer program code, recording medium, computer memory, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc. In some jurisdictions, according to legislation and patent practice, the computer readable medium cannot be an electrical carrier signal and a telecommunication signal.

[0164] The present application realizes all or part of the processes in the above-mentioned embodiment methods, which can also be completed by a computer program product. When the computer program product runs on the computer equipment, it makes the computer equipment execute the steps in the above-mentioned embodiment methods.

[0165] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0166] In a seventh embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the charging equalization control method in the above embodiments, such as steps S101-S103 shown in FIG. 2, or to implement the discharging equalization control method in the above embodiments, such as steps S301-S303 shown in FIG. 2. For the sake of brevity, the description is not repeated here. Alternatively, the computer program is executed by the processor to implement the functions of the modules / units in the above charging equalization control device or discharging equalization control device embodiment, such as the charging equalization control function shown in FIG. 5 or the discharging equalization control function shown in FIG. 6. For the sake of brevity, the description is not repeated here.

[0167] A person of ordinary skill in the art can understand that all or part of the processes in the above embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above embodiments can be included. Any reference to memory, storage, database or other medium in the embodiments provided in the present application can include non-volatile and / or volatile memory. The non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. The volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM) and the like.

[0168] The above embodiments can also be implemented by a computer program product. When the computer program product is run on a computer device, the computer device is caused to implement the steps in the above embodiments.

[0169] In the above embodiments, the description of each embodiment has its own focus. The parts not described or recorded in detail in an embodiment can be referred to the relevant description of other embodiments.

[0170] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0171] In the embodiments provided by the present application, it should be understood that the disclosed apparatus / computer device and method can be implemented in other manners. For example, the described apparatus / computer device embodiments are merely schematic. For example, the division of the modules or units can be different, and each can include a plurality of sub-units. Some or all of the modules or units can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0172] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e. may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0173] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A charge equalization control method of a battery system, wherein, The charging equalization control method of the battery system comprises: obtaining the current power value of each battery module and the corresponding bidirectional DCDC power module charging power in the constant current charging stage and / or the constant voltage charging stage; sorting each battery module according to the current power value of each battery module to obtain a first power sorting result, and sorting each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result; screening out the bidirectional DCDC power module to be adjusted according to the first power sorting result and the first power sorting result, and determining the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted, so as to adjust the charging power of the bidirectional DCDC power module to be adjusted according to the charging current adjustment parameter.

2. The charge equalization control method of a battery system according to claim 1, wherein, According to the first power sorting result and the first power sorting result, the step of screening out the bidirectional DCDC power module to be adjusted and determining the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted comprises: comparing whether the first power sorting result of each battery module and the corresponding first power sorting result are consistent; determining the bidirectional DCDC power module in the battery module whose first power sorting result and first power sorting result are inconsistent as the bidirectional DCDC power module to be adjusted, and determining the charging current adjustment parameter according to the first power sorting result and the first power sorting result; adjusting the charging current of the bidirectional DCDC power module to be adjusted according to the charging current adjustment parameter, so as to adjust the bidirectional DCDC power module charging power of each battery module by adjusting the charging current of the bidirectional DCDC power module to be adjusted, so that the sorting result of sorting each battery module according to the bidirectional DCDC power module charging power is consistent with the sorting result of sorting each battery module according to the power value.

3. The charge equalization control method of a battery system according to claim 1, wherein, The charging equalization control method of the battery system further comprises the following steps performed in the pre-charging stage of each battery module: obtaining the real-time power bus voltage, and judging whether the power bus voltage is in the preset linear adjustment range; if the power bus voltage is in the preset linear adjustment range, linearly calculating the maximum power output by each battery module according to the power bus voltage to obtain the initial bidirectional DCDC power module charging power of each battery module, and setting each battery module to output according to the initial bidirectional DCDC power module charging power.

4. The charge equalization control method of a battery system according to claim 3, wherein, The lower limit value of the preset linear adjustment range is a preset stop charging voltage, and the upper limit value of the preset linear adjustment range is a preset maximum peak power charging voltage.

5. The charge equalization control method of a battery system according to claim 4, wherein, After the step of obtaining the real-time power bus voltage and judging whether the power bus voltage is in the preset linear adjustment range, further comprising: if the power bus voltage is less than the preset stop charging voltage, each battery module stops charging.

6. The charge equalization control method of a battery system according to claim 4, wherein, After the step of acquiring the real-time power bus voltage and judging whether the power bus voltage is in a preset linear adjustment range, the method further comprises: If the power bus voltage is greater than the preset maximum peak power charging voltage, the initial bidirectional DCDC power module charging power of each battery module is the maximum power output by the bidirectional DCDC power module.

7. A discharge equalization control method of a battery system in which, The discharge equalization control method of the battery system comprises: Acquiring the power values of each battery module and the discharge powers of the corresponding bidirectional DCDC power modules; According to the power values of each battery module, the battery modules are sorted to obtain a second power value sorting result, and according to the discharge powers of the bidirectional DCDC power modules of each battery module, the battery modules are sorted to obtain a second power sorting result; According to the second power value sorting result and the second power sorting result, the bidirectional DCDC power modules to be adjusted are screened out, and the discharge power adjustment parameters of each bidirectional DCDC power module to be adjusted are determined, so as to adjust the discharge power of the bidirectional DCDC power module to be adjusted according to the discharge power adjustment parameter.

8. The discharge equalization control method of a battery system according to claim 7, wherein, According to the second power value sorting result and the second power sorting result, the bidirectional DCDC power modules to be adjusted are screened out, and the discharge power adjustment parameters of each bidirectional DCDC power module to be adjusted are determined, so as to adjust the discharge power of the bidirectional DCDC power module to be adjusted according to the discharge power adjustment parameter. The step of comparing whether the second power value sorting result of each battery module and the corresponding second power sorting result are consistent; The bidirectional DCDC power module in the battery module whose second power value sorting result and second power sorting result are inconsistent is determined as the bidirectional DCDC power module to be adjusted, and the discharge power adjustment parameter is determined according to the second power value sorting result and the second power sorting result; According to the discharge power adjustment parameter, the discharge power of the bidirectional DCDC power module to be adjusted in the battery module is adjusted, so that the sorting result of sorting each battery module according to the discharge power of the bidirectional DCDC power module is consistent with the sorting result of sorting each battery module according to the power value.

9. The discharge equalization control method of a battery system according to claim 8, wherein, The step of adjusting the discharge power of the bidirectional DCDC power module to be adjusted in the battery module according to the discharge power adjustment parameter, so that the sorting result of sorting each battery module according to the discharge power of the bidirectional DCDC power module is consistent with the sorting result of sorting each battery module according to the power value, comprises: The step of adjusting the discharge power of the bidirectional DCDC power module to be adjusted in the battery module according to the discharge power adjustment parameter, so that the sorting result of sorting each battery module according to the discharge power of the bidirectional DCDC power module is consistent with the sorting result of sorting each battery module according to the power value, comprises: The discharge current and the discharge voltage of the to-be-adjusted bidirectional DCDC power supply module are adjusted according to the discharge power adjustment parameter, so that the sorting result of sorting each battery module according to the charging power of each bidirectional DCDC power supply module is consistent with the sorting result of sorting each battery module according to the electric quantity value.

10. A battery system, wherein, The battery system comprises a master control module, a power supply bus, a system bus and at least one battery module; The signal input end of the master control module is connected to the signal output end of the power supply bus, the power supply end of the battery module is connected to the power supply end of an external device through the power supply bus, the master control module manages each battery module through the system bus, the master control module is connected to the control signal output end of an energy storage converter through an uplink communication bus, and the battery module is composed of a battery cell and a BMS board with a built-in bidirectional DCDC power supply module; The master control module is used to execute the following charging equalization control method of the battery system, comprising: obtaining the current electric quantity value of each battery module and the corresponding bidirectional DCDC power supply module charging power in the constant current charging phase and / or the constant voltage charging phase; sorting each battery module according to the current electric quantity value of each battery module to obtain a first electric quantity sorting result, and sorting each battery module according to the bidirectional DCDC power supply module charging power of each battery module to obtain a first power sorting result; According to the first electric quantity sorting result and the first power sorting result, the to-be-adjusted bidirectional DCDC power supply module is screened out, and the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module is determined, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power supply module according to the charging current adjustment parameter. The master control module is used to execute the following discharging equalization control method of the battery system, comprising: obtaining the electric quantity value of each battery module and the corresponding bidirectional DCDC power supply module discharging power; sorting each battery module according to the electric quantity value of each battery module to obtain a second electric quantity sorting result, and sorting each battery module according to the bidirectional DCDC power supply module discharging power of each battery module to obtain a second power sorting result; According to the second electric quantity sorting result and the second power sorting result, the to-be-adjusted bidirectional DCDC power supply module is screened out, and the discharging power adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module is determined, so as to adjust the discharging power of the to-be-adjusted bidirectional DCDC power supply module according to the discharging power adjustment parameter.

11. The battery system of claim 10, wherein, The step of screening out the to-be-adjusted bidirectional DCDC power supply module according to the first electric quantity sorting result and the first power sorting result, and determining the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power supply module according to the charging current adjustment parameter, comprises: comparing whether the first electric quantity sorting result of each battery module and the corresponding first power sorting result are consistent; determining that the bidirectional DCDC power modules in the battery module whose second electric quantity sorting result and second power sorting result are inconsistent are the to-be-adjusted bidirectional DCDC power modules, and determining the discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module according to the second electric quantity sorting result and the second power sorting result, so as to adjust the discharge power of the to-be-adjusted bidirectional DCDC power module according to the discharge power adjustment parameter; adjusting the charging current of the to-be-adjusted bidirectional DCDC power module according to the charging current adjustment parameter, so as to adjust the charging power of the bidirectional DCDC power module of each battery module, and make the sorting result of sorting each battery module according to the charging power of each bidirectional DCDC power module consistent with the sorting result of sorting each battery module according to the electric quantity value.

12. The battery system of claim 10, wherein, The charging equalization control method of the battery system further includes the following steps performed in the pre-charging phase of each battery module: obtaining a real-time power bus voltage, and determining whether the power bus voltage is in a preset linear adjustment range; if the power bus voltage is in the preset linear adjustment range, performing linear calculation on the maximum power output by each battery module according to the power bus voltage to obtain the initial bidirectional DCDC power module charging power of each battery module, and setting each battery module to output according to the initial bidirectional DCDC power module charging power.

13. The battery system of claim 12, wherein, The lower limit value of the preset linear adjustment range is a preset stop charging voltage, and the upper limit value of the preset linear adjustment range is a preset maximum peak power charging voltage; after the step of obtaining a real-time power bus voltage and determining whether the power bus voltage is in a preset linear adjustment range, the method further includes: if the power bus voltage is less than the preset stop charging voltage, each battery module stops charging; if the power bus voltage is greater than the preset maximum peak power charging voltage, the initial bidirectional DCDC power module charging power of each battery module is the maximum power output by each bidirectional DCDC power module.

14. The battery system of claim 10, wherein, According to the second electric quantity sorting result and the second power sorting result, the to-be-adjusted bidirectional DCDC power modules are screened out, and the discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power module is determined, so as to adjust the discharge power of the to-be-adjusted bidirectional DCDC power module according to the discharge power adjustment parameter, and the step includes: comparing whether the second electric quantity sorting result and the corresponding second power sorting result of each battery module are consistent; determining that the bidirectional DCDC power modules in the battery module whose second electric quantity sorting result and second power sorting result are inconsistent are the to-be-adjusted bidirectional DCDC power modules, and determining the discharge power adjustment parameter according to the second electric quantity sorting result and the second power sorting result; The discharging power of the to-be-adjusted bidirectional DCDC power supply module in the battery module is adjusted according to the discharging power adjustment parameter, so that the sorting result of the battery modules according to the discharging power of each bidirectional DCDC power supply module is consistent with the sorting result of the battery modules according to the electric quantity value.

15. The battery system of claim 14, wherein, The step of adjusting the discharging power of the to-be-adjusted bidirectional DCDC power supply module in the battery module according to the discharging power adjustment parameter, so that the sorting result of the battery modules according to the discharging power of each bidirectional DCDC power supply module is consistent with the sorting result of the battery modules according to the electric quantity value, comprises: The discharging current and the discharging voltage of the to-be-adjusted bidirectional DCDC power supply module are adjusted according to the discharging power adjustment parameter, so that the sorting result of the battery modules according to the discharging power of each bidirectional DCDC power supply module is consistent with the sorting result of the battery modules according to the electric quantity value.

16. A charge equalization control device of a battery system, wherein, The charging equalization control device comprises: A first data acquisition module is configured to acquire the current electric quantity value of each battery module and the corresponding charging power of the bidirectional DCDC power supply module in the constant-current charging phase and / or the constant-voltage charging phase. A first power comparison module is configured to sort each battery module according to the current electric quantity value of each battery module to obtain a first electric quantity sorting result, and sort each battery module according to the charging power of the bidirectional DCDC power supply module of each battery module to obtain a first power sorting result. A first power adjustment module is configured to select a to-be-adjusted bidirectional DCDC power supply module according to the first electric quantity sorting result and the first power sorting result, and determine the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power supply module according to the charging current adjustment parameter. The processor executes the computer program to realize the following charging equalization control method of the battery system:

17. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, Acquire the current electric quantity value of each battery module and the corresponding charging power of the bidirectional DCDC power supply module in the constant-current charging phase and / or the constant-voltage charging phase. Sort each battery module according to the current electric quantity value of each battery module to obtain a first electric quantity sorting result, and sort each battery module according to the charging power of the bidirectional DCDC power supply module of each battery module to obtain a first power sorting result. Select a to-be-adjusted bidirectional DCDC power supply module according to the first electric quantity sorting result and the first power sorting result, and determine the charging current adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module, so as to adjust the charging power of the to-be-adjusted bidirectional DCDC power supply module according to the charging current adjustment parameter. ​ 18. A computer-readable storage medium storing a computer program, wherein, The computer program is executed by the processor to realize the following charging equalization control method of a battery system: Obtain the current power value of each battery module and the corresponding bidirectional DCDC power module charging power in the constant current charging stage and / or the constant voltage charging stage; Sort each battery module according to the current power value of each battery module to obtain a first power sorting result, and sort each battery module according to the bidirectional DCDC power module charging power of each battery module to obtain a first power sorting result; According to the first power sorting result and the first power sorting result, the bidirectional DCDC power module to be adjusted is screened out, and the charging current adjustment parameter of each bidirectional DCDC power module to be adjusted is determined, so that the charging power of the bidirectional DCDC power module to be adjusted is adjusted according to the charging current adjustment parameter.

19. A discharge equalization control device of a battery system, wherein, The discharging equalization control device comprises: The second data acquisition module is used for obtaining the power value of each battery module and the corresponding bidirectional DCDC power module discharging power; The second power comparison module is used for sorting each battery module according to the power value of each battery module to obtain a second power sorting result, and sorting each battery module according to the bidirectional DCDC power module discharging power of each battery module to obtain a second power sorting result; The second power adjustment module is used for screening out the bidirectional DCDC power module to be adjusted according to the second power sorting result and the second power sorting result, and determining the discharging power adjustment parameter of each bidirectional DCDC power module to be adjusted, so that the discharging power of the bidirectional DCDC power module to be adjusted is adjusted according to the discharging power adjustment parameter.

20. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, The processor executes the computer program to realize the following discharging equalization control method of a battery system: Obtain the power value of each battery module and the corresponding bidirectional DCDC power module discharging power; Sort each battery module according to the power value of each battery module to obtain a second power sorting result, and sort each battery module according to the bidirectional DCDC power module discharging power of each battery module to obtain a second power sorting result; According to the second power sorting result and the second power sorting result, the bidirectional DCDC power module to be adjusted is screened out, and the discharging power adjustment parameter of each bidirectional DCDC power module to be adjusted is determined, so that the discharging power of the bidirectional DCDC power module to be adjusted is adjusted according to the discharging power adjustment parameter.

21. A computer-readable storage medium storing a computer program, wherein, The computer program is executed by the processor to realize the following discharging equalization control method of a battery system: Obtain the power value of each battery module and the corresponding bidirectional DCDC power module discharging power; Sort each battery module according to the power value of each battery module to obtain a second power sorting result, and sort each battery module according to the bidirectional DCDC power module discharging power of each battery module to obtain a second power sorting result; According to the second electric quantity sorting result and the second power sorting result, a to-be-adjusted bidirectional DCDC power supply module is screened out, and a discharge power adjustment parameter of each to-be-adjusted bidirectional DCDC power supply module is determined, so that the discharge power of the to-be-adjusted bidirectional DCDC power supply module is adjusted according to the discharge power adjustment parameter.

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