WO2023050377A1 - 荷电状态的确定方法、装置和系统 - Google Patents

荷电状态的确定方法、装置和系统 Download PDF

Info

Publication number
WO2023050377A1
WO2023050377A1 PCT/CN2021/122357 CN2021122357W WO2023050377A1 WO 2023050377 A1 WO2023050377 A1 WO 2023050377A1 CN 2021122357 W CN2021122357 W CN 2021122357W WO 2023050377 A1 WO2023050377 A1 WO 2023050377A1
Authority
WO
WIPO (PCT)
Prior art keywords
state
battery
battery pack
charge
electrical parameter
Prior art date
Application number
PCT/CN2021/122357
Other languages
English (en)
French (fr)
Inventor
黄振慧
马行
李永超
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2021/122357 priority Critical patent/WO2023050377A1/zh
Priority to CN202180081981.5A priority patent/CN116569380A/zh
Publication of WO2023050377A1 publication Critical patent/WO2023050377A1/zh

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells

Definitions

  • the present application relates to the technical field of batteries, in particular to a method, device and system for determining the state of charge.
  • the State of Charge (SOC) of the battery is used to reflect the remaining capacity of the battery. Accurate SOC is used to realize battery power indication, remaining mileage, overcharge and overdischarge protection, battery balancing, charging control and battery health status. Forecasting and other aspects play an important role.
  • Embodiments of the present application provide a method, device, and system for determining a state of charge.
  • the embodiment of the present application provides a method for determining the state of charge, the method is applied to the sub-battery management unit, and the sub-battery management unit communicates with the main battery management unit,
  • the main battery management unit is used to control the energy output state of the battery system, and the battery system includes at least a first battery pack and a second battery pack connected in parallel;
  • a sub-battery management unit configured to control the energy output state of the first battery pack
  • Methods include:
  • the main battery management unit After receiving the first signal sent by the main battery management unit, obtain the electrical parameter value in the first battery pack within a preset period of time; wherein, the first signal is used to indicate that the battery system is in a state of no energy output;
  • the state of charge of the first battery pack is determined according to the comparison result of the electric parameter value and the preset electric parameter threshold.
  • the method for determining the state of charge provided by the embodiment of the present application can obtain the energy parameter value in the first battery pack within a preset time period when the battery system is in the state of no energy output (high voltage under the vehicle), according to the The result of comparing the electrical parameter value with the preset electrical parameter value can determine whether the current current generated in the first battery pack is a circulating current or a zero-drift current, and then more accurately determine the state of charge in the battery pack based on the comparison result.
  • obtaining the electrical parameter value in the first battery pack within a preset time period includes: receiving the first signal sent by the main battery management unit After the signal, the first battery pack is controlled to be in a state of energy output within a preset duration; the preset duration is determined based on the duration of circulating current in the first battery pack; within the preset duration, the first battery pack is obtained electrical parameter values.
  • the sub-battery management unit controls the first battery pack to be in an energy-enabled state, that is, a current loop is formed in the first battery pack, which can avoid parallel-connected batteries. Due to the frequent cut-off of the internal current loop between the packs and the increase of the voltage difference, a large circulating current impact is formed, so as to avoid adverse effects on the safety of the battery system.
  • calculating the first state-of-charge value of the first battery pack according to the comparison result between the electrical parameter value and the preset electrical parameter threshold includes: when the electrical parameter value is greater than the preset electrical parameter threshold Next, calculate the first state of charge value of the first battery pack according to the electrical parameter value.
  • determining the state of charge of the first battery pack according to a comparison result between the electric parameter value and the preset electric parameter threshold includes:
  • the state of charge of the first battery pack is determined.
  • the real current condition (circulating current or zero drift current) existing in the first battery pack is judged, and different calculation methods are used to calculate the second battery pack. A state of charge value, to get more accurate SOC calculation results.
  • determining the state of charge of the first battery pack according to the first state of charge value includes: making a difference between the first state of charge value and a preset error value to obtain the second state of charge value, the preset error value includes the preset power consumption of the sub-battery management unit; the state of charge corresponding to the second state of charge value is determined as the state of charge of the first battery pack.
  • the first state of charge state can be corrected by using the error value such as the power consumption of the preset sub-battery management unit, and then the accurate state of charge of the first battery pack can be obtained. state of charge.
  • the embodiment of the present application provides a sub-battery management unit, the sub-battery management unit communicates with the main battery management unit,
  • the main battery management unit is used to control the energy output state of the battery system, and the battery system includes at least a first battery pack and a second battery pack connected in parallel;
  • a sub-battery management unit configured to control the energy output state of the first battery pack
  • Devices include:
  • the acquisition module is configured to acquire the electrical parameter value in the first battery pack within a preset time period after receiving the first signal sent by the main battery management unit; wherein, the first signal is used to indicate that the battery system is in no energy output state;
  • the determination module is configured to determine the state of charge of the first battery pack according to the comparison result of the electrical parameter value and the preset electrical parameter threshold.
  • the embodiment of the present application provides an electronic device, the electronic device includes a memory and a processor; the memory is used to store executable program codes;
  • the processor is used to read the executable program code stored in the memory to execute the method for determining the state of charge in the first aspect.
  • an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium includes instructions, and when the instructions are run on a computer, the computer is made to execute the method for determining the state of charge in the first aspect.
  • an embodiment of the present application provides a battery management system, the battery management system includes a main battery management unit and a sub-battery management unit,
  • the main battery management unit is communicatively connected with the sub-battery management unit, and is used to control the energy output state of the battery system;
  • the battery system includes a first battery pack and a second battery pack connected in parallel,
  • a sub-battery management unit configured to control the energy output state of the first battery pack
  • the sub-battery management unit is further configured to implement the method for determining the state of charge in the first aspect.
  • Fig. 1 is a schematic structural diagram of a battery system disclosed in an embodiment of the present application
  • Fig. 2 is a schematic flowchart of a method for determining the state of charge disclosed in an embodiment of the present application
  • Fig. 3 is a schematic flowchart of a method for determining a state of charge disclosed in an example of the present application
  • Fig. 5 is a schematic flowchart of a method for determining the state of charge disclosed in another example of the present application.
  • Fig. 6 is a schematic structural diagram of a device for determining a state of charge disclosed in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a hardware structure of an electronic device disclosed by an embodiment of the present application.
  • 100-battery system 101-charging main circuit; 102-input terminal; 1021-positive terminal; 1022-negative terminal; 103-output terminal; 104-main battery management unit; 105-first battery pack; 106-second battery package; 107-charging branch; 1081-positive terminal; 1082-negative terminal; 109-sub-battery management unit.
  • the battery system generally includes a single battery pack in series, and the intelligent management of the battery system is realized through the battery management system (Battery Management System, BMS) set in the system.
  • BMS Battery Management System
  • the BMS in the battery system controls the current loop in a single battery pack to be disconnected, and collects the zero-drift current when the battery pack is switched to disconnect to calculate the SOC (State of Charge, state of charge).
  • the battery system includes multiple battery packs connected in parallel, wherein a single battery
  • the energy output state of the battery pack is controlled by the slave battery management unit (Slave Battery Management Nnit, SBMU), and the energy output state of the battery system is controlled by the master battery management unit (Master Battery Management Unit, MBMU).
  • Communication connection, SBMU and MBMU constitute the BMS of the battery system.
  • the secondary architecture battery system is used as the power supply of the vehicle.
  • calculating the SOC of the battery system first calculate the SOC of each battery pack, and then calculate the SOC of the battery system based on the SOC of each battery pack.
  • the inventors of the present application have found through research that frequently cutting off the current loop in the battery pack will lead to an increase in the voltage difference between the parallel connected battery packs.
  • the pressure difference is too large, the circulating current generated between the battery packs may have an impact on the devices in the battery pack, thus affecting the safety of the battery pack.
  • the embodiments of the present application provide a method, device and system for determining the state of charge, wherein the method and device for determining the state of charge in the embodiments of the present application can be A sub-battery management unit in a battery system applied to a secondary architecture.
  • FIG. 1 shows a schematic structural diagram of a secondary architecture battery system.
  • the battery system 100 includes a charging main circuit 101, and the charging main circuit 101 includes multiple sets of electric energy input terminals 102 and a set of electric energy output terminals 103 (a set of output terminals or output terminals all include a positive terminal and a negative terminal. Terminals), multiple groups of power input terminals 102 are connected in parallel to power output terminals 103, and a first switch module K1 is provided between each group of power input terminals 102 and power output terminals 103.
  • the main battery control unit 104 in the battery system BMS can control the energy output of the battery system 100 by controlling the first switch module K1 to be turned on and off.
  • Each battery pack (105, 106) connected in parallel in the battery system 100 includes a charging branch circuit, and the charging branch circuit 107 in the first battery pack 105 is taken as an example for illustration.
  • the charging branch 107 includes a power supply module E1, a protection module S1, and a second switch module K2, and the protection module S1, the power supply module E1, and the second switch module K2 are sequentially connected in series and connected to the positive and negative output terminals of the first battery pack 105 correspondingly. (1081, 1082), the positive and negative output terminals (1081, 1082) of the first battery pack 105 are correspondingly connected to one set of electric energy input terminals (1021, 1022) on the main charging circuit 101 .
  • the sub-battery management unit 109 corresponding to the first battery pack 105 controls the energy output in the first battery pack 105 by controlling the on-off of the second switch module K2.
  • both the first switch module K1 and the second switch module K2 may be relays, the protection module S1 may be a fuse, and the power module E1 may be a battery cell or a battery cell.
  • the entirety of a single battery pack can be collectively referred to as a battery.
  • the battery can be any type of battery, including but not limited to: lithium ion battery, lithium metal battery, lithium sulfur battery, lead acid battery, nickel battery, nickel metal hydride battery, or lithium air battery, etc. wait.
  • the battery system as a whole may be set in a power distribution box (Battery Disconnect Unit, BDU).
  • BDU Battery Disconnect Unit
  • a voltage converter (not shown in the figure) is also connected to the charging branch in the first battery pack, and the voltage converter is used to convert the high voltage output by the charging branch into a low voltage to supply power to the corresponding sub-battery management unit .
  • the first battery pack also includes a sampling module (not shown in the figure), which is used to collect electrical parameter values on the charging branch in the first battery pack and transmit them to the corresponding sub-battery management unit.
  • the sampling module can be an open/closed-loop Hall element, a fluxgate or a shunt shunt, capable of collecting the current value on the charging branch.
  • all the battery packs in the battery system may have the structure of the first battery pack as shown in FIG. 1 .
  • the above battery system may be a battery system in an electric vehicle (including a pure electric vehicle and a plug-in hybrid electric vehicle) or a battery system in other application scenarios.
  • Fig. 2 shows a schematic flowchart of a method for determining a state of charge in an embodiment of the present application.
  • the determination method in the embodiment of the present application can be applied to the sub-battery management unit, wherein the sub-battery management unit is connected to the sub-battery management unit in communication with the main battery management unit, and the main battery management unit is used to control the energy output state of the battery system , the battery system at least includes a first battery pack and a second battery pack connected in parallel; a sub-battery management unit, configured to control the energy output state of the first battery pack.
  • the method may include steps S201-S203:
  • the VCU Vehicle Control Unit, vehicle controller
  • the VCU Vehicle Control Unit, vehicle controller
  • the MBMU switches the battery system to a state of no energy output, and communicates the first signal representing this state It is transmitted to the SBMU corresponding to the first battery pack.
  • the SBMU When the SBMU receives the first signal, within the preset time period, the SBMU acquires the electrical parameter value in the first battery pack from the sampling unit in the first battery pack.
  • the electrical parameter value may be a current value.
  • the preset electrical parameter threshold is a threshold used to distinguish the current in the battery pack as circulating current or zero-drift current.
  • the circulating current is the real energy consumption.
  • the zero-drift current in the battery pack is the current when the zero-point drift phenomenon is formed.
  • the zero-point drift is when the input signal of the amplifier circuit is zero (that is, there is no AC input), due to the influence of environmental temperature changes, power supply voltage instability and other factors.
  • the operating point changes, and is amplified and transmitted step by step, resulting in the phenomenon that the output voltage of the circuit deviates from the original fixed value and drifts up and down.
  • the zero-drift current when calculating the SOC, the zero-drift current is not regarded as real energy consumption.
  • the zero-drift current is smaller than the current value of the circulating current, so in the embodiment of the present application, the zero-drift current and the circulating current can be distinguished by preset electrical parameter value thresholds.
  • the SBMU After the SBMU obtains the electrical parameter value in the first battery pack, it first compares it with the preset electrical parameter threshold to determine whether the electrical parameter value is a circulating current value or a zero-drift current value, that is, to determine whether there is real energy in the first battery pack consumption, so that according to the comparison result, the state of charge of the first battery pack can be correspondingly determined, which improves the calculation accuracy of the state of charge value.
  • Fig. 3 shows a schematic flowchart of a method for determining a state of charge in an example of the present application.
  • step S301-S302 After receiving the first signal sent by the main battery management Acquiring the electrical parameter value in the first battery pack within a certain period of time may specifically include steps S301-S302:
  • the MBMU cuts off the external energy output of the battery system through step S300 , and sends a first signal to the SBMU corresponding to the first battery pack.
  • the entire battery system has no external energy output, but there may be an instantaneous current in the first battery pack, so after receiving the first signal, the SBMU corresponding to the first battery pack controls the current loop in the first battery pack through step S301 (charging Branch) to maintain the open state, to avoid the operation of cutting off the charging branch, so that the instantaneous current will impact the switch module on the branch, thus affecting the safety of the battery pack.
  • the preset duration is determined based on the duration of circulating current in the first battery pack. For example, the duration of circulating current in the corresponding battery pack can be determined through a preset number of tests, and the average or maximum value of the duration can be calculated as the preset duration.
  • the current in the first battery pack may be circulating current or zero-drift current, which may be determined by the electrical parameter values of the first battery pack collected in step S302.
  • the second switch module on the charging branch in the first battery pack can be controlled to switch to an open state, or can also be kept closed.
  • the sub-battery management unit controls the first battery pack to be in a state of energy output, that is, a current loop is formed in the first battery pack, which can avoid parallel connection of battery packs. Due to the frequent cut off of the internal current loop to increase the voltage difference, a large circulating current impact is generated, so as to avoid adverse effects on the safety of the battery system.
  • Fig. 4 shows a schematic flowchart of a method for determining a state of charge in another example of the present application.
  • step S202 is based on the comparison result of the electrical parameter value and the preset electrical parameter threshold , to determine the state of charge of the first battery pack, which may specifically include S401-S404:
  • the preset electrical parameter value is a reference current value that can determine whether the current instantaneous current in the battery pack is a circulating current or a zero-drift current.
  • the preset electrical parameter value in the embodiment of the present application is 300mA, and the electrical parameter value is lower than 300mA It is the zero drift current value, and the electrical parameter value higher than 300mA is the circulating current value.
  • Step S401 After comparing the values in step S401, if the electrical parameter value of the first battery pack is greater than the preset electrical parameter value, it can be determined that the current in the current battery pack is a circulating current, that is, it can be determined that there is real power consumption in the current battery pack.
  • Step S402 calculating the SOC of the first battery pack according to the corresponding collected electrical parameter values.
  • step S403 can be performed, The SOC of the first battery pack is directly calculated according to the preset electric parameter reference value.
  • the preset electrical parameter value is 0, indicating that there is no real current consumption in the current battery pack.
  • the SOC when calculating the SOC by using the electrical parameter value or the electrical parameter reference value, it may be calculated by an ampere-hour integral method, or may be calculated by other suitable calculation methods, which are not exclusively limited in this embodiment of the present application.
  • the real current condition (circulating current or zero-drift current) existing in the first battery pack can be judged, so that different calculation methods can be used to calculate the first The state of charge value can get more accurate SOC calculation results.
  • the SOC of the corresponding battery pack can be determined through step S404. Since the first SOC value is calculated based on the actual power consumption in the battery pack, the accuracy is high.
  • Fig. 5 shows a schematic flowchart of a method for determining a state of charge in another example of the present application.
  • step S404 determines the state of charge of the first battery pack according to the first state of charge value, which may specifically include S501-S502:
  • the first state of charge value can be corrected through the corresponding preset error value, thereby determining a more accurate second The state of charge of a battery pack.
  • the preset error value may include power consumption of the sub-battery management unit, and may also include power consumption of components in other battery packs.
  • the charging branch in the battery pack is controlled to be in the on-state state within a preset period of time, some components in the battery pack will consume electric energy, resulting in a certain error in the calculated SOC. For this reason, in this embodiment of the application, the power consumption of the energy-bearing components is used as the error value, and the first state of charge value is corrected through step S501, and the second state of charge value is obtained after correction, and the first state of charge value is obtained through step S502.
  • the second state of charge value is determined as the real state of charge of the first battery pack, and a more accurate state of charge determination result is obtained.
  • the sub-battery management unit can send the calculated second state of charge value to the main battery management unit, and the main battery management unit will subsequently, based on the second state of charge value of the first battery pack and the second state of charge value of other batteries, Calculate the state of charge of the entire battery system.
  • the calculation method of the state of charge of the battery system is a mature technology in the field, and will not be repeated here.
  • the sub-battery management unit of the first battery pack can determine the SOC of the first battery pack through the method of the embodiment of the present application.
  • the sub-battery management units corresponding to other battery packs in the battery system can use the method of the embodiment of the present application. , to determine the SOC of the corresponding battery pack.
  • the sub-battery management unit of each battery pack transmits the determined SOC value (second state of charge value) to the main battery management unit, and the main battery management unit can calculate the SOC of the entire battery system based on the received SOC value of each battery pack, Since the SOC value of each battery pack has high accuracy, the SOC calculation accuracy of the battery system is improved.
  • FIG. 6 shows a schematic structural diagram of an apparatus for determining a state of charge provided by an embodiment of the present application.
  • the device can be applied to a sub-battery management unit, the sub-battery management unit communicates with the main battery management unit, and the main battery management unit is used to control the energy output state of the battery system.
  • the battery system includes at least a first battery pack and a second battery pack connected in parallel. The battery pack; the sub-battery management unit, used to control the energy output state of the first battery pack.
  • the device may include:
  • the obtaining module 601 is configured to obtain the electrical parameter value in the first battery pack within a preset time period after receiving the first signal sent by the main battery management unit; wherein, the first signal is used to indicate that the battery system is in the state of no energy output state;
  • the determination module 602 is configured to determine the state of charge of the first battery pack according to the comparison result of the electric parameter value and the preset electric parameter threshold.
  • the battery system involved in the embodiment of the present application may have a structure of a battery system with a secondary structure as shown in FIG. 1 , which will not be repeated here.
  • the VCU Vehicle Control Unit, vehicle controller
  • the VCU Vehicle Control Unit, vehicle controller
  • the MBMU switches the battery system to a state of no energy output, and communicates the first signal representing this state It is transmitted to the SBMU corresponding to the first battery pack.
  • the SBMU When the SBMU receives the first signal, within a preset time period, the SBMU acquires the electrical parameter value in the first battery pack from the sampling unit in the first battery pack.
  • the electrical parameter value may be a current value.
  • the preset electrical parameter threshold is a threshold used to distinguish the current in the battery pack as circulating current or zero-drift current.
  • the circulating current is the real energy consumption.
  • the zero-drift current in the battery pack is the current when the zero-point drift phenomenon is formed.
  • the zero-point drift is when the input signal of the amplifier circuit is zero (that is, there is no AC input), due to the influence of environmental temperature changes, power supply voltage instability and other factors.
  • the operating point changes, and is amplified and transmitted step by step, resulting in the phenomenon that the output voltage of the circuit deviates from the original fixed value and drifts up and down.
  • the zero-drift current when calculating the SOC, the zero-drift current is not regarded as real energy consumption.
  • the zero-drift current is smaller than the current value of the circulating current, so in the embodiment of the present application, the zero-drift current and the circulating current can be distinguished by preset electrical parameter value thresholds.
  • the SBMU After the SBMU obtains the electrical parameter value in the first battery pack, it first compares it with the preset electrical parameter threshold to determine whether the electrical parameter value is a circulating current value or a zero-drift current value, that is, to determine whether there is real energy in the first battery pack consumption, so that according to the comparison result, the state of charge of the first battery pack can be correspondingly determined, and the calculation accuracy of the state of charge value can be improved.
  • the first state of charge value can be corrected to determine a more accurate second The state of charge of a battery pack.
  • the acquisition module 601 may specifically include:
  • the control sub-module 6011 is configured to control the first battery pack to be in an energy output state within a preset time period after receiving the first signal sent by the main battery management unit;
  • the acquisition sub-module 6012 is used to acquire the electrical parameter values in the first battery pack within a preset time period.
  • the MBMU When the vehicle is under high-voltage power, the MBMU cuts off the external energy output of the battery system, and sends a first signal to the SBMU corresponding to the first battery pack. At this time, the entire battery system has no external energy output, but there may be an instantaneous current in the first battery pack, so the SBMU corresponding to the first battery pack controls the current loop (charging branch) in the first battery pack after receiving the first signal Keep the open state and avoid the operation of cutting off the charging branch, so that the instantaneous current will impact the switch module on the branch, thus affecting the safety of the battery pack.
  • the preset duration is determined based on the duration of circulating current in the first battery pack.
  • the current in the first battery pack may be a circulating current or a zero-drift current, which may be determined by collecting electrical parameter values of the first battery pack.
  • the second switch module on the charging branch in the first battery pack can be controlled to switch to an open state, or can also be kept closed.
  • the sub-battery management unit controls the first battery pack to be in a state of energy output, that is, a current loop is formed in the first battery pack, which can avoid parallel connection of battery packs. Due to the frequent cut off of the internal current loop and the increase of the voltage difference, a large circulating current impact is formed, so as to avoid adverse effects on the safety of the battery system.
  • the determining module 602 may specifically include:
  • Comparison module 6021 used to compare the electrical parameter value with the preset electrical parameter value
  • the first calculation sub-module 6022 is used to calculate the first state of charge value of the first battery pack according to the electrical parameter value when the electrical parameter value is greater than the preset electrical parameter threshold;
  • the second calculation sub-module 6023 is used to calculate the first state of charge value of the first battery pack according to the preset electrical parameter reference value when the electrical parameter value is less than the preset electrical parameter threshold value;
  • the determination sub-module 6024 is configured to determine the state of charge of the first battery pack according to the first state of charge value.
  • the preset electrical parameter value is a reference current value that can determine whether the current instantaneous current in the battery pack is a circulating current or a zero-drift current.
  • the preset electrical parameter value in the embodiment of the present application is 300mA, and the electrical parameter value is lower than 300mA It is the zero drift current value, and the electrical parameter value higher than 300mA is the circulating current value.
  • the electrical parameter value of the first battery pack is greater than the preset electrical parameter value, it can be determined that the current in the current battery pack is a circulating current, that is, it can be determined that there is real power consumption in the current battery pack, and the second battery pack can be calculated according to the corresponding collected electrical parameter value. SOC of a battery pack.
  • the electrical parameter value of the first battery pack is less than the preset electrical parameter value, it can be determined that the current in the current battery pack is a zero-drift current, that is, it is determined that there is no real power consumption in the current battery pack, and the current value will be determined directly according to the preset electric parameter value.
  • the parameter reference value calculates the SOC of the first battery pack. Wherein, the preset electrical parameter value is 0, indicating that there is no real current consumption in the current battery pack.
  • the SOC when calculating the SOC by using the electrical parameter value or the electrical parameter reference value, it may be calculated by an ampere-hour integral method, or may be calculated by other suitable calculation methods, which are not exclusively limited in this embodiment of the present application.
  • the real current condition (circulating current or zero-drift current) existing in the first battery pack can be judged, so that different calculation methods can be used to calculate the first The state of charge value can get more accurate SOC calculation results.
  • the state of charge of the corresponding battery pack can be determined through the determination sub-module 6024. Since the first state of charge value is calculated according to the actual power consumption in the battery pack, the accuracy is high .
  • the determining submodule 6024 can be specifically used for:
  • the state of charge corresponding to the second state of charge value is determined as the state of charge of the first battery pack.
  • the first state of charge value can be corrected through the corresponding preset error value, thereby determining a more accurate second The state of charge of a battery pack.
  • the preset error value may include power consumption of the sub-battery management unit, and may also include power consumption of components in other battery packs.
  • the charging branch in the battery pack is controlled to be in the on-state state within a preset period of time, some components in the battery pack will consume power, resulting in a certain error in the calculated SOC. For this reason, in the embodiment of the present application, the power consumption of the energy-bearing components is used as an error value, and the first state of charge value is corrected, so as to obtain an accurate state of charge of the first battery pack.
  • the sub-battery management unit of the first battery pack can determine the SOC of the first battery pack through the method of the embodiment of the present application.
  • the sub-battery management units corresponding to other battery packs in the battery system can use the method of the embodiment of the present application. , to determine the SOC of the corresponding battery pack.
  • the sub-battery management unit of each battery pack transmits the determined SOC value (second state of charge value) to the main battery management unit, and the main battery management unit can calculate the SOC of the entire battery system based on the received SOC value of each battery pack, Since the SOC value of each battery pack is highly accurate, the calculation accuracy of the SOC of the battery system is improved.
  • FIG. 7 shows a schematic diagram of a hardware structure of an electronic device in an embodiment of the present application.
  • the electronic device 700 includes a memory 701 and a processor 702; the memory 702 is used to store executable program codes;
  • the processor 701 is used to read the executable program code stored in the memory 702 to execute the various processes of the above embodiments of the method for determining the state of charge, and can achieve the same technical effect. To avoid repetition, details are not repeated here.
  • the embodiment of the present application provides a readable storage medium.
  • the readable storage medium includes instructions. When the instructions are run on the processor, each process of the above-mentioned method for determining the state of charge can be implemented, and the same technical effect can be achieved. , to avoid repetition, it will not be repeated here.
  • the processor is the processor in the electronic device described in the above embodiments.
  • the readable storage medium includes a computer readable storage medium, such as a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above method for determining the state of charge
  • the chip includes a processor and a communication interface
  • the communication interface is coupled to the processor
  • the processor is used to run programs or instructions to implement the above method for determining the state of charge
  • chips mentioned in the embodiments of the present application may also be called system-on-chip, system-on-chip, system-on-a-chip, or system-on-a-chip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

荷电状态的确定方法、装置和系统，能够在电池系统（100）处于无能量输出(车辆下高压电)状态下，在预设时长内获取第一电池包（105）内的能量电参数值，根据该电参数值与预设电参数值比较结果，可以判断当前第一电池包（105）内产生的是环流还是零漂电流，进而基于比较结果更为准确地计算该第一电池包（105）内的荷电状态。

Description

荷电状态的确定方法、装置和系统 技术领域
本申请涉及电池技术领域，特别是涉及一种荷电状态的确定方法、装置和系统。
背景技术
电池的荷电状态(State of Charge，简称SOC)用来反映电池的剩余容量状态，准确的SOC在实现电池的电量指示、剩余里程、过充过放保护、电池均衡、充电控制及电池健康状况预测等方面都具有重要作用。
但目前SOC的计算方式准确性低。
发明内容
本申请实施例提供一种荷电状态的确定方法、装置和系统。
一方面，本申请实施例提供了一种荷电状态的确定方法，该方法应用于子电池管理单元，子电池管理单元与主电池管理单元通信连接，
主电池管理单元，用于控制电池系统的能量输出状态，电池系统至少包括并联的第一电池包和第二电池包；
子电池管理单元，用于控制第一电池包的能量输出状态；
方法包括：
接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值；其中，第一信号用于表征电池系统处于无能量输出状态；
根据电参数值与预设电参数阈值的比较结果，确定第一电池包的荷电状态。
本申请实施例提供的荷电状态的确定方法，能够在电池系统处于无能量输出(车辆下高压电)状态下，在预设时长内获取第一电池包内的能 量电参数值，根据该电参数值与预设电参数值比较结果，可以判断当前第一电池包内产生的是环流还是零漂电流，进而基于比较结果更为准确地确定该电池包内的荷电状态。
在一种可能的实现方式中，接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值，包括：接收到主电池管理单元发送的第一信号后，在预设时长内控制第一电池包处于有能量输出状态；预设时长基于第一电池包内存在环流的时长确定；在所述预设时长内，获取所述第一电池包内的电参数值。
通过该实现方式的技术方案，在主电池管理单元切断电池系统能量输出后，子电池管理单元控制第一电池包处于有能量状态，即第一电池包内形成电流回路，这样能够避免并联的电池包之间由于频繁切断内部电流回路增大电压差而形成大的环流冲击的情况，从而避免对电池系统的安全性产生不利影响。
在一种可能的实现方式中，根据电参数值与预设电参数阈值的比较结果，计算第一电池包的第一荷电状态值，包括：在电参数值大于预设电参数阈值的情况下，根据电参数值计算第一电池包的第一荷电状态值。
在一种可能的实现方式中，根据电参数值与预设电参数阈值的比较结果，确定第一电池包的荷电状态，包括：
在电参数值小于预设电参数阈值的情况下，根据预设电参数基准值计算第一电池包的第一荷电状态值；
根据第一荷电状态值，确定第一电池包的荷电状态。
通过上述实现方式的技术方案，根据电参数值与预设电参数值的不同比较结果，判断第一电池包内存在的真实电流情况(环流或零漂电流)，从而采用不同的计算方式计算第一荷电状态值，得到更准确的SOC计算结果。
在一种可能的实现方式中，根据第一荷电状态值，确定第一电池包的荷电状态，包括：将第一荷电状态值与预设误差值作差，得到第二荷电状态值，预设误差值包括预设的子电池管理单元耗电量；将第二荷电状态值对应的荷电状态，确定为第一电池包的荷电状态。
在根据第一电池包内的电流情况计算的第一荷电状态值后，利用预设子电池管理单元耗电量等误差值修正第一荷电状态，进而能够得到精确的第一电池包的荷电状态。
第二方面，本申请实施例提供了一种应用于子电池管理单元，子电池管理单元与主电池管理单元通信连接，
主电池管理单元，用于控制电池系统的能量输出状态，电池系统至少包括并联的第一电池包和第二电池包；
子电池管理单元，用于控制第一电池包的能量输出状态；
装置包括：
获取模块，用于接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值；其中，第一信号用于表征所述电池系统处于无能量输出状态；
确定模块，用于根据电参数值与预设电参数阈值的比较结果，，确定第一电池包的荷电状态。
第三方面，本申请实施例提供了一种电子设备，所述电子设备包括存储器和处理器；所述存储器用于储存有可执行程序代码；
处理器用于读取存储器中存储的可执行程序代码以执行第一方面中的荷电状态的确定方法。
第四方面，本申请实施例提供了一种计算机可读存储介质，计算机可读存储介质包括指令，当指令在计算机上运行时，使得计算机执行第一方面中的荷电状态的确定方法。
第五方面，本申请实施例提供了一种电池管理系统，电池管理系统包括主电池管理单元和子电池管理单元，
主电池管理单元，与子电池管理单元通信连接，并用于控制电池系统的能量输出状态；电池系统包括并联的第一电池包和第二电池包，
子电池管理单元，用于控制第一电池包的能量输出状态；
子电池管理单元，还用于执行第一方面中的荷电状态的确定方法。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是本申请一实施例公开的一种电池系统的结构示意图；
图2是本申请一实施例公开的一种荷电状态的确定方法流程示意图；
图3是本申请一示例公开的一种荷电状态的确定方法流程示意图；
图4是本申请另一示例公开的一种荷电状态的确定方法流程示意图；
图5是本申请又一示例公开的一种荷电状态的确定方法流程示意图；
图6是本申请一实施例公开的一种荷电状态的确定装置的结构示意图；
图7是本申请一实施例公开的一种电子设备的硬件结构示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
100-电池系统；101-充电干路；102-输入端子；1021-正极端子；1022-负极端子；103-输出端子；104-主电池管理单元；105-第一电池包；106-第二电池包；107-充电支路；1081-正极端子；1082-负极端子；109-子电池管理单元。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装 置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
目前，市场上的电池系统多是一级架构，即电池系统中一般包括串联的单个电池包，电池系统的智能化管理通过该系统中设置的电池管理系统实现(Battery Management System，BMS)。车辆整车下电后，电池系统中的BMS控制单个电池包内的电流回路断路，并采集电池包切换到断路时的零漂电流计算SOC(State of Charge，荷电状态)。
由于一级架构的电池系统容量较低，本申请的申请人设计了一种提高电池容量的二级架构电池系统，该电池系统内包括并联的多个电池包(battery pack)，其中，单个电池包的能量输出状态通过子电池管理单元(Slave Battery Management Nnit，SBMU)控制，电池系统的能量输出状态通过主电池管理单元(Master Nattery Management Unit，MBMU)控制，各电池包对应的SBMU均与MBMU通信连接，SBMU和MBMU等构成电池系统的BMS。
采用二级架构电池系统作为车辆的供电源，计算电池系统的SOC时，先计算各电池包的SOC，然后根据各电池包的SOC计算电池系统的SOC。其中，计算单个电池包SOC时，往往需要切断各个电池包内的电流回路，采集电流回路断开时的电流值来计算SOC。
但本申请的发明人研究发现，频繁切断电池包内的电流回路会导致并联的电池包之间压差增大。当压差过大时，电池包之间产生的环流可能 会对电池包内的器件产生冲击，从而影响电池包的安全性。
但如果计算SOC的过程中将并联电池包内的电流回路保持通路状态，则当前电池包内的电流无论是否是真实能量消耗，都会被直接用于计算SOC，从而因电流值采样准确性低，导致最终得到的SOC值精度低。
为了保证二级架构电池系统中SOC的计算准确性，本申请实施例提供了一种荷电状态的确定方法、装置和系统，其中，本申请实施例的荷电状态的确定方法和装置，可以应用于二级架构的电池系统中的子电池管理单元。
下面结合附图，首先对本申请实施中涉及的电池系统进行说明。
示例性的，图1示出了一种二级架构的电池系统的结构示意图。
如图1所示，电池系统100中包括充电干路101，充电干路101包括多组电能输入端子102和一组电能输出端子103(一组输出端子或输出端子中，均包括正极端子和负极端子)，多组电能输入端子102并联后与电能输出端子103连接，且各组电能输入端子102与电能输出端子103之间设有第一开关模块K1。电池系统BMS中的主电池控制单元104可以通过控制第一开关模块K1的通断，进而控制电池系统100的能量输出。
电池系统100中并联的各电池包(105，106)内均包括充电支路，以第一电池包105中的充电支路107为例进行说明。该充电支路107包括电源模块E1、保护模块S1以及第二开关模块K2，保护模块S1、电源模块E1以及第二开关模块K2依次串联后对应接入第一电池包105的正、负输出端子(1081，1082)，第一电池包105的正、负输出端子(1081，1082)对应连接充电干路101上的其中一组电能输入端子(1021，1022)。第一电池包105对应的子电池管理单元109通过控制第二开关模块K2的通断，进而控制第一电池包105内的能量输出。
示例性的，第一开关模块K1、第二开关模块K2均可以为继电器，保护模块S1可以为保险丝，电源模块E1可以为电芯或电池单体(cell)。
示例性的，电池系统中，单个电池包的整体可以统称为电池。从电池的种类而言，该电池可以是任意类型的电池，包括但不限于：锂离子电 池、锂金属电池、锂硫电池、铅酸电池、镍隔电池、镍氢电池、或者锂空气电池等等。
可选的，电池系统整体可以设置在配电盒(Battery Disconnect Unit，BDU)中。
可选的，第一电池包内充电支路上还连接有电压转换器(图中未标示)，电压转换器用于将充电支路输出的高电压转换为低电压，为对应的子电池管理单元供电。
应理解，第一电池包内还包括采样模块(图中未标示)，采样模块用于采集第一电池包内充电支路上的电参数值，并传输至对应的子电池管理单元。可选的，采样模块可以为开/闭环霍尔元件、磁通门或shunt分流器，能够采集充电支路上的电流值。
应理解，电池系统中的电池包都可以具有如图1中所示第一电池包的结构。
应理解，上述电池系统可为电动汽车(包含纯电动汽车和可插电的混合动力电动汽车)中的电池系统或者其它应用场景下的电池系统。
图2示出了在本申请一个实施例中的荷电状态的确定方法的流程示意图。本申请实施例的该确定方法可以应用于子电池管理单元，其中，该子电池管理单元与子电池管理单元与主电池管理单元通信连接，主电池管理单元，用于控制电池系统的能量输出状态，电池系统至少包括并联的第一电池包和第二电池包；子电池管理单元，用于控制第一电池包的能量输出状态。
如图2所示，该方法可以包括步骤S201～S203：
S201.接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值；其中，第一信号用于表征电池系统处于无能量输出状态。
车辆整车下电以后，VCU(Vehicle Control Unit，整车控制器)将整车下电的信息发送到MBMU，MBMU将电池系统切换为无能量输出状态，并将表征该状态的第一信号通信传输至第一电池包对应的SBMU。
该SBMU接收到第一信号的情况下，在预设时长内，SBMU从第一 电池包内的采样单元获取第一电池包内的电参数值。
可选的，该电参数值可以为电流值。
S202.根据电参数值与预设电参数阈值的比较结果，确定第一电池包的荷电状态。
预设电参数阈值为用于区分电池包内电流为环流或零漂电流的阈值。
二级架构电流系统中的并联电池包工作过程中，如果电池包之间存在压差，则会在电池包之间会形成电压高的电池包给电压低的电池包充电的现象，该现象中的电流即为环流。在整车下电时，电池包之间的瞬时压差会使电池包内存在瞬时环流。本申请实施例中，计算SOC时，环流为真实能量消耗。
电池包内零漂电流为形成零点漂移现象时的电流，零点漂移是当放大电路输入信号为零(即没有交流电输入)时，由于受环境温度变化、电源电压不稳等因素的影响，使静态工作点发生变化，并被逐级放大和传输，导致电路输出端电压偏离原固定值而上下漂动的现象。本申请实施例中，计算SOC时，零漂电流不作为真实能量消耗。
零漂电流比环流的电流值小，因此本申请实施例中，可以通过预设电参数值阈值对零漂电流和环流进行区分。
SBMU获取第一电池包内的电参数值后，先与预设电参数阈值进行比较，判定该电参数值为环流值还是零漂电流值，也即判别该第一电池包内是否有真实能量消耗，从而根据比较结果，可以对应确定第一电池包的荷电状态，提高了荷电状态值的计算准确性。
图3示出了本申请一个示例中荷电状态的确定方法的流程示意图。
为了在准确计算SOC的同时，保障电池包的安全性，可选的，如图3所示，本申请实施例中，在步骤S201接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值中，具体可以包括步骤S301～S302：
S301.接收到主电池管理单元发送的第一信号后，在预设时长内控制第一电池包处于有能量输出状态；
S302.在预设时长内，获取第一电池包内的电参数值。
如图3所示，车辆下高压电，MBMU通过步骤S300切断电池系统对外的能量输出，并发送第一信号到第一电池包对应的SBMU。此时整个电池系统对外没有能量输出，但第一电池包内可能存在瞬时电流，故而第一电池包对应的SBMU接收到第一信号后，通过步骤S301控制第一电池包内的电流回路(充电支路)保持通路状态，避免切断充电支路的操作使瞬时电流对该支路上的开关模块造成冲击，从而影响电池包安全性。
预设时长基于第一电池包内存在环流的时长确定。例如，可以通过预设次数的试验确定对应电池包内存在环流的时长，计算该时长的均值或最大值作为预设时长。
在预设时长内，第一电池包中存在的电流可能是环流，也可能是零漂电流，可以通过步骤S302采集的第一电池包的电参数值确定。
经过预设时长以后，可以控制第一电池包内的充电支路上的第二开关模块切换为断开状态，或者也可以保持闭合。
本申请实施例中，在主电池管理单元切断电池系统能量输出后，子电池管理单元控制第一电池包处于有能量输出状态，即第一电池包内形成电流回路，这样能够避免并联的电池包之间由于频繁切断内部电流回路增大电压差而导致产生大的环流冲击的情况，从而避免对电池系统的安全性产生不利影响。
图4示出了本申请另一个示例中荷电状态的确定方法的流程示意图。
为了准确判别电池包内的电流为环流或者零漂电流，从而准确计算出电池包内的SOC，可选的，如图4所示，步骤S202根据电参数值与预设电参数阈值的比较结果，确定第一电池包的荷电状态，具体可以包括S401～S404：
S401.比较电参数值与预设电参数阈值；
S402.在电参数值大于预设电参数阈值的情况下，根据电参数值计算第一电池包的第一荷电状态值；
S403.在电参数值小于预设电参数阈值的情况下，根据预设电参数基 准值计算第一电池包的第一荷电状态值；
S404.根据第一荷电状态值，确定第一电池包的荷电状态。
预设电参数值是能够判断出电池包内当前瞬时电流为环流还是零漂电流的参考电流值，可选的，本申请实施例中预设电参数值为300mA，低于300mA的电参数值为零漂电流值，高于300mA的电参数值为环流值。
通过步骤S401比较数值大小后，如果第一电池包的电参数值大于预设电参数值，则可以判定当前电池包内的电流为环流，也即判定当前电池包内有真实电能消耗，可以通过步骤S402，根据对应采集的电参数值计算第一电池包的SOC。
反之，如果第一电池包的电参数值小于预设电参数值，则可以判定当前电池包内的电流为零漂电流，也即判定当前电池包内没有真实电能消耗，则可以通过步骤S403，直接根据预设电参数基准值计算第一电池包的SOC。
可选的，预设电参数值为0，表示当前电池包内没有真实电流消耗。
可选的，通过电参数值或电参数基准值计算SOC时，可以通过安时积分法计算，也可以通过其他适合的计算方式计算，本申请实施例不做唯一限定。
本申请实施例中，根据电参数值与预设电参数值的不同比较结果，判断第一电池包内存在的真实电流情况(环流或零漂电流)，从而可以采用不同的计算方式计算第一荷电状态值，能够得到更准确的SOC计算结果。
计算出第一荷电状态值后，可以通过步骤S404确定对应电池包的荷电状态，由于第一荷电状态值是根据电池包内的实际电能消耗情况计算出的，因此准确性高。
图5示出了本申请又一个示例中荷电状态的确定方法流程示意图。
为了得到更精确的SOC，可选的，本申请实施例中，如图5所示，步骤S404根据第一荷电状态值，确定第一电池包的荷电状态，具体可以包括S501～S502：
S501.将第一荷电状态值与预设误差值作差，得到第二荷电状态值；
S502.将第二荷电状态值对应的荷电状态，确定为第一电池包的荷电状态。
由于电池系统处于无能量输出状态后，第一电池包内还可能有其他元器件耗电，因此通过对应的预设误差值，可以修正第一荷电状态值，从而确定出更为准确的第一电池包的荷电状态。
可选的，预设误差值可以包括子电池管理单元耗电量，还可以包括其他电池包内的元器件耗电量。
由于预设时长内控制电池包内的充电支路处于通路状态时，电池包内的有些元器件会消耗电能，导致计算的SOC可能存在一定误差。为此本申请实施例中，将消耗带能的元器件的耗电量作为误差值，通过步骤S501修正第一荷电状态值，修正后得到第二荷电状态值，通过步骤S502将该第二荷电状态值确定为第一电池包的真实荷电状态，得到更为精确的荷电状态确定结果。
子电池管理单元可以将计算得到的第二荷电状态值发送给主电池管理单元，主电池管理单元后续根据第一电池包的第二荷电状态值以及其他电池的第二荷电状态值，计算整个电池系统的荷电状态。
电池系统的荷电状态计算方式为本领域成熟技术，此处不再赘述。
第一电池包的子电池管理单元可以通过本申请实施例的方法，确定第一电池包的SOC，同理电池系统中的其他电池包对应的子电池管理单元均可以通过本申请实施例的方法，确定对应电池包的SOC。各电池包的子电池管理单元将确定的SOC值(第二荷电状态值)传输至主电池管理单元，主电池管理单元可以根据接收到的各电池包的SOC值计算整个电池系统的SOC，由于各电池包的SOC值精确度较高，从而提高了电池系统的SOC计算精确度。
图6示出了本申请实施例提供了一种荷电状态的确定装置的结构示意。该装置可以应用于子电池管理单元，子电池管理单元与主电池管理 单元通信连接，主电池管理单元，用于控制电池系统的能量输出状态，电池系统至少包括并联的第一电池包和第二电池包；子电池管理单元，用于控制第一电池包的能量输出状态。
如图6所示，该装置可以包括：
获取模块601，用于接收到主电池管理单元发送的第一信号后，在预设时长内获取第一电池包内的电参数值；其中，第一信号用于表征所述电池系统处于无能量输出状态；
确定模块602，用于根据电参数值与预设电参数阈值的比较结果，确定第一电池包的荷电状态。
可选的，本申请实施例中涉及的电池系统，可以是具有如图1中所示的二级架构的电池系统的结构，此处不再赘述。
车辆整车下电以后，VCU(Vehicle Control Unit，整车控制器)将整车下电的信息发送到MBMU，MBMU将电池系统切换为无能量输出状态，并将表征该状态的第一信号通信传输至第一电池包对应的SBMU。
该SBMU接收到第一信号的情况下，在预设时长内，SBMU从第一电池包内的采样单元获取第一电池包内的电参数值。
可选的，该电参数值可以为电流值。
预设电参数阈值为用于区分电池包内电流为环流或零漂电流的阈值。
二级架构电流系统中的并联电池包工作过程中，如果电池包之间存在压差，则会在电池包之间会形成电压高的电池包给电压低的电池包充电的现象，该现象中的电流即为环流。在整车下电时，电池包之间的瞬时压差会使电池包内存在瞬时环流。本申请实施例中，计算SOC时，环流为真实能量消耗。
电池包内零漂电流为形成零点漂移现象时的电流，零点漂移是当放大电路输入信号为零(即没有交流电输入)时，由于受环境温度变化、电源电压不稳等因素的影响，使静态工作点发生变化，并被逐级放大和传输，导致电路输出端电压偏离原固定值而上下漂动的现象。本申请实施例中，计算SOC时，零漂电流不作为真实能量消耗。
零漂电流比环流的电流值小，因此本申请实施例中，可以通过预设电参数值阈值对零漂电流和环流进行区分。
SBMU获取第一电池包内的电参数值后，先与预设电参数阈值进行比较，判定该电参数值为环流值还是零漂电流值，也即判别该第一电池包内是否有真实能量消耗，从而根据比较结果，可以对应确定第一电池包的荷电状态，提高荷电状态值的计算准确性。
由于电池系统处于无能量输出状态后，第一电池包内还可能有其他元器件耗电，因此根据对应的预设误差值，可以修正第一荷电状态值，从而确定出更为准确的第一电池包的荷电状态。
可选的，为了在准确计算SOC的同时，保障电池包的安全性，可选的，本申请实施例中，获取模块601具体可以包括：
控制子模块6011，用于接收到主电池管理单元发送的第一信号后，在预设时长内控制第一电池包处于有能量输出状态；
获取子模块6012，用于在预设时长内，获取第一电池包内的电参数值。
车辆下高压电，MBMU切断电池系统对外的能量输出，并发送第一信号到第一电池包对应的SBMU。此时整个电池系统对外没有能量输出，但第一电池包内可能存在瞬时电流，故而第一电池包对应的SBMU接收到第一信号后，控制第一电池包内的电流回路(充电支路)保持通路状态，避免切断充电支路的操作使瞬时电流对该支路上的开关模块造成冲击，从而影响电池包安全性。
预设时长基于第一电池包内存在环流的时长确定。
在预设时长内，第一电池包中存在的电流可能是环流，也可能是零漂电流，可以通过采集第一电池包的电参数值确定。
经过预设时长以后，可以控制第一电池包内的充电支路上的第二开关模块切换为断开状态，或者也可以保持闭合。
本申请实施例中，在主电池管理单元切断电池系统能量输出后，子电池管理单元控制第一电池包处于有能量输出状态，即第一电池包内形 成电流回路，这样能够避免并联的电池包之间由于频繁切断内部电流回路增大电压差而形成大的环流冲击的情况，从而避免对电池系统的安全性产生不利影响。
为了准确判别电池包内的电流为环流或者零漂电流，从而准确计算出电池包内的SOC，可选的，确定模块602具体可以包括：
比较模块6021，用于比较电参数值和预设电参数值；
第一计算子模块6022，用于在电参数值大于预设电参数阈值的情况下，根据电参数值计算第一电池包的第一荷电状态值；
第二计算子模块6023，用于在电参数值小于预设电参数阈值的情况下，根据预设电参数基准值计算第一电池包的第一荷电状态值；
确定子模块6024，用于根据第一荷电状态值，确定第一电池包的荷电状态。
预设电参数值是能够判断出电池包内当前瞬时电流为环流还是零漂电流的参考电流值，可选的，本申请实施例中预设电参数值为300mA，低于300mA的电参数值为零漂电流值，高于300mA的电参数值为环流值。
如果第一电池包的电参数值大于预设电参数值，则可以判定当前电池包内的电流为环流，也即判定当前电池包内有真实电能消耗，可以根据对应采集的电参数值计算第一电池包的SOC。
反之，如果第一电池包的电参数值小于预设电参数值，则可以判定当前电池包内的电流为零漂电流，也即判定当前电池包内没有真实电能消耗，则直接根据预设电参数基准值计算第一电池包的SOC。其中，预设电参数值为0，表示当前电池包内没有真实电流消耗。
可选的，通过电参数值或电参数基准值计算SOC时，可以通过安时积分法计算，也可以通过其他适合的计算方式计算，本申请实施例不做唯一限定。
本申请实施例中，根据电参数值与预设电参数值的不同比较结果，判断第一电池包内存在的真实电流情况(环流或零漂电流)，从而可以采用不同的计算方式计算第一荷电状态值，能够得到更准确的SOC计算 结果。
计算出第一荷电状态值后，可以通过确定子模块6024确定对应电池包的荷电状态，由于第一荷电状态值是根据电池包内的实际电能消耗情况计算出的，因此准确性高。
为了得到更精确的SOC，可选的，本申请实施例中，确定子模块6024具体可以用于：
将第一荷电状态值与预设误差值作差，得到第二荷电状态值；
将第二荷电状态值对应的荷电状态，确定为第一电池包的荷电状态。
由于电池系统处于无能量输出状态后，第一电池包内还可能有其他元器件耗电，因此通过对应的预设误差值，可以修正第一荷电状态值，从而确定出更为准确的第一电池包的荷电状态。
可选的，预设误差值可以包括子电池管理单元耗电量，还可以包括其他电池包内的元器件耗电量。
由于预设时长内控制电池包内的充电支路处于通路状态时，电池包内的有些元器件会消耗电能，导致计算的SOC可能存在一定误差。为此本申请实施例中，将消耗带能的元器件的耗电量作为误差值，修正第一荷电状态值，进而能够得到精确的第一电池包的荷电状态。
第一电池包的子电池管理单元可以通过本申请实施例的方法，确定第一电池包的SOC，同理电池系统中的其他电池包对应的子电池管理单元均可以通过本申请实施例的方法，确定对应电池包的SOC。各电池包的子电池管理单元将确定的SOC值(第二荷电状态值)传输至主电池管理单元，主电池管理单元可以根据接收到的各电池包的SOC值计算整个电池系统的SOC，由于各电池包的SOC值是精确度较高，从而提高了电池系统的SOC计算精确度。
图7示出了本申请实施例中一种电子设备的硬件结构示意图。如图7所示，电子设备700包括存储器701和处理器702；所述存储器702用于储存有可执行程序代码；
处理器701用于读取存储器702中存储的可执行程序代码以执行 上述荷电状态的确定方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例提供了一种可读存储介质，可读存储介质包括指令，当指令在处理器上运行时可以实现上述荷电状态的确定方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
其中，所述处理器为上述实施例中所述的电子设备中的处理器。所述可读存储介质，包括计算机可读存储介质，如只读存储器(Read-Only Memory，ROM)或随机存取存储器(Random Access Memory，RAM)。
本申请实施例另提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现上述荷电状态的确定方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片、系统芯片、芯片系统或片上系统芯片等。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (9)

  1. 一种荷电状态的确定方法，所述方法应用于子电池管理单元，所述子电池管理单元与主电池管理单元通信连接，
    所述主电池管理单元，用于控制电池系统的能量输出状态，所述电池系统至少包括并联的第一电池包和第二电池包；
    所述子电池管理单元，用于控制所述第一电池包的能量输出状态；
    所述方法包括：
    接收到所述主电池管理单元发送的第一信号后，在预设时长内获取所述第一电池包内的电参数值；其中，所述第一信号用于表征所述电池系统处于无能量输出状态；
    根据所述电参数值与预设电参数阈值的比较结果，确定所述第一电池包的荷电状态。
  2. 根据权利要求1所述的方法，其中，所述接收到所述主电池管理单元发送的第一信号后，在预设时长内获取所述第一电池包内的电参数值，包括：
    接收到所述主电池管理单元发送的第一信号后，在预设时长内控制所述第一电池包处于有能量输出状态；所述预设时长为预计所述第一电池包内存在环流的时长；
    在所述预设时长内，获取所述第一电池包内的电参数值。
  3. 根据权利要求1所述的方法，其中，所述根据所述电参数值与预设电参数阈值的比较结果，确定所述第一电池包的荷电状态，包括：
    在所述电参数值大于预设电参数阈值的情况下，根据所述电参数值计算所述第一电池包的第一荷电状态值；
    根据所述第一荷电状态值，确定所述第一电池包的荷电状态。
  4. 根据权利要求1所述的方法，其中，所述根据所述电参数值与预设电参数阈值的比较结果，确定所述第一电池包的荷电状态，包括：
    在所述电参数值小于预设电参数阈值的情况下，根据预设电参数基准值计算所述第一电池包的第一荷电状态值；
    根据所述第一荷电状态值，确定所述第一电池包的荷电状态。
  5. 根据权利要求3或4所述的方法，其中，所述根据所述第一荷电状态值，确定所述第一电池包的荷电状态，包括：
    将所述第一荷电状态值与预设误差值作差，得到第二荷电状态值，所述预设误差值包括预设的子电池管理单元耗电量；
    将所述第二荷电状态值对应的荷电状态，确定为所述第一电池包的荷电状态。
  6. 一种荷电状态的确定装置，所述装置应用于子电池管理单元，所述子电池管理单元与主电池管理单元通信连接，
    所述主电池管理单元，用于控制电池系统的能量输出状态，所述电池系统至少包括并联的第一电池包和第二电池包；
    所述子电池管理单元，用于控制所述第一电池包的能量输出状态；
    所述装置包括：
    获取模块，用于接收到所述主电池管理单元发送的第一信号后，在预设时长内获取所述第一电池包内的电参数值；其中，所述第一信号用于表征所述电池系统处于无能量输出状态；
    确定模块，用于根据所述电参数值与预设电参数阈值的比较结果，确定所述第一电池包的荷电状态。
  7. 一种电子设备，所述设备包括存储器和处理器；所述存储器用于储存有可执行程序代码；
    所述处理器用于读取所述存储器中存储的可执行程序代码以执行权利要求1至5中任一项所述的荷电状态的确定方法。
  8. 一种可读存储介质，所述可读存储介质包括指令，当所述指令在处理器上运行时实现如权利要求1至5中任一项所述的荷电状态的确定方法。
  9. 一种电池系统，所述电池系统包括并联的多个电池包，所述电池系统还包括电池管理系统，
    所述电池管理系统包括主电池管理单元和多个子电池管理单元，
    所述主电池管理单元，与子电池管理单元通信连接，并用于控制所述电池系统的能量输出状态；
    多个所述子电池管理单元，用于一一对应地控制多个所述电池包的能量输出状态；
    所述子电池管理单元，还用于执行权利要求1-5任一项所述的荷电状态的确定方法。
PCT/CN2021/122357 2021-09-30 2021-09-30 荷电状态的确定方法、装置和系统 WO2023050377A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2021/122357 WO2023050377A1 (zh) 2021-09-30 2021-09-30 荷电状态的确定方法、装置和系统
CN202180081981.5A CN116569380A (zh) 2021-09-30 2021-09-30 荷电状态的确定方法、装置和系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/122357 WO2023050377A1 (zh) 2021-09-30 2021-09-30 荷电状态的确定方法、装置和系统

Publications (1)

Publication Number Publication Date
WO2023050377A1 true WO2023050377A1 (zh) 2023-04-06

Family

ID=85781183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/122357 WO2023050377A1 (zh) 2021-09-30 2021-09-30 荷电状态的确定方法、装置和系统

Country Status (2)

Country Link
CN (1) CN116569380A (zh)
WO (1) WO2023050377A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116937752A (zh) * 2023-09-14 2023-10-24 广州德姆达光电科技有限公司 一种户外移动储能电源充放电控制方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040018419A1 (en) * 2002-07-24 2004-01-29 Nissan Motor Co., Ltd. Control for battery pack
CN106558896A (zh) * 2015-09-25 2017-04-05 现代自动车株式会社 车辆用的电池管理系统及其控制方法
CN110896156A (zh) * 2018-09-12 2020-03-20 宁德时代新能源科技股份有限公司 能量存储模块
CN112379282A (zh) * 2020-12-08 2021-02-19 东风汽车集团有限公司 提高基于安时积分法的动力电池soc估算精度的方法
CN112798968A (zh) * 2020-12-24 2021-05-14 重庆峘能电动车科技有限公司 电池并联方法、估算电池并联系统soc的方法及相关设备
CN112865264A (zh) * 2021-03-24 2021-05-28 东莞新能安科技有限公司 控制储能装置的方法、储能装置、供电系统和用电装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040018419A1 (en) * 2002-07-24 2004-01-29 Nissan Motor Co., Ltd. Control for battery pack
CN106558896A (zh) * 2015-09-25 2017-04-05 现代自动车株式会社 车辆用的电池管理系统及其控制方法
CN110896156A (zh) * 2018-09-12 2020-03-20 宁德时代新能源科技股份有限公司 能量存储模块
CN112379282A (zh) * 2020-12-08 2021-02-19 东风汽车集团有限公司 提高基于安时积分法的动力电池soc估算精度的方法
CN112798968A (zh) * 2020-12-24 2021-05-14 重庆峘能电动车科技有限公司 电池并联方法、估算电池并联系统soc的方法及相关设备
CN112865264A (zh) * 2021-03-24 2021-05-28 东莞新能安科技有限公司 控制储能装置的方法、储能装置、供电系统和用电装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116937752A (zh) * 2023-09-14 2023-10-24 广州德姆达光电科技有限公司 一种户外移动储能电源充放电控制方法
CN116937752B (zh) * 2023-09-14 2023-12-26 广州德姆达光电科技有限公司 一种户外移动储能电源充放电控制方法

Also Published As

Publication number Publication date
CN116569380A (zh) 2023-08-08

Similar Documents

Publication Publication Date Title
KR101367875B1 (ko) 배터리 팩 연결 제어 장치 및 방법
US9252624B2 (en) Battery control device and battery system
WO2014065615A1 (ko) 배터리 잔존 용량 추정 장치 및 방법
US10230248B2 (en) Maintenance method of power battery pack
WO2014065614A1 (ko) 배터리 잔존 용량 추정 장치 및 방법
CN103683428B (zh) 一种用于电动汽车的电池管理系统以及电动汽车
US20160187431A1 (en) Storage battery, storage-battery evaluating device, and storage-battery evaluating method
EP4064413A1 (en) Charging method, battery management system for traction battery, and charging pile
EP4220885A1 (en) Charging/discharging apparatus, battery charging and discharging method, and charging/discharging system
WO2024040972A1 (zh) 电池系统和电池包连接状态识别方法
US20240136828A1 (en) Charging control method for battery system and charging control apparatus
WO2023050377A1 (zh) 荷电状态的确定方法、装置和系统
KR20220110665A (ko) 충전 방법 및 전력 변환 장치
CN103413980A (zh) 智能混合电池管理系统
CN114552736A (zh) 一种锂电工业车辆用均衡系统及工作方法
US20230261487A1 (en) Charging method, charging apparatus, and charging system for traction battery
CN218731204U (zh) 电池模块、电池包及设备
CN202474130U (zh) 后备电池组系统
CN116325420A (zh) 电池充电的方法和充放电装置
CN102856954A (zh) 一种动力电池均衡方法、单元、电池管理系统、电动汽车
KR20230086807A (ko) 파워 배터리 충전 방법 및 배터리 관리 시스템
KR101472886B1 (ko) 전지팩의 전압 밸런싱 장치 및 방법
CN115885407A (zh) 充放电装置、电池充电的方法和充放电系统
US12123917B2 (en) Method and system for determining remaining charging time of battery
EP4227695A1 (en) Method and system for determining remaining battery charging time

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21958948

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202180081981.5

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21958948

Country of ref document: EP

Kind code of ref document: A1