WO2022236545A1 - 一种电池系统及控制方法 - Google Patents
一种电池系统及控制方法 Download PDFInfo
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- WO2022236545A1 WO2022236545A1 PCT/CN2021/092680 CN2021092680W WO2022236545A1 WO 2022236545 A1 WO2022236545 A1 WO 2022236545A1 CN 2021092680 W CN2021092680 W CN 2021092680W WO 2022236545 A1 WO2022236545 A1 WO 2022236545A1
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- battery
- cluster
- voltage
- switch
- battery module
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002955 isolation Methods 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims description 74
- 230000036541 health Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 101100129590 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mcp5 gene Proteins 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
Definitions
- the present application relates to the field of electronic technology, in particular to a battery system and a control method.
- battery systems are widely used in scenarios such as power generation side, grid side, user side (such as industrial and commercial power consumption, residential power consumption, etc.) and micro-grid.
- the DC voltage levels required in different scenarios are also diverse. For example, the DC voltage level required by commercial power stations on the power generation side is the highest, and the DC voltage level required in industrial and commercial power consumption scenarios is lower than that required by commercial power stations.
- the DC voltage level required for user-side scenarios is usually the lowest.
- a battery system can provide a single DC voltage level, which is difficult to adapt to the diverse DC voltage levels required by different scenarios.
- the present application provides a battery system and a control method, which can provide voltages required by various loads, have a wide range of application scenarios, and have high scene adaptability.
- the present application provides a battery system, including a first busbar, at least one battery cluster, and a control circuit; each of the battery clusters is connected to the first busbar, and the first busbar is connected to a load;
- the battery cluster includes a plurality of battery units connected in series; each battery unit includes a battery module, an access switch K1 and an isolation switch K2; the access switch K1 is connected in series with the battery module A first branch is formed, and the isolating switch K2 is connected in parallel with the first branch;
- the control circuit is connected to the control terminal of the access switch K1 and the isolating switch K2, and is used for: according to the requirements of the load control the access switch K1 and the isolating switch K2 of the N battery units in the battery cluster, so that the battery modules in the N battery units are connected to the first bus for For power supply, the output voltage of the first bus bar meets the first voltage required by the load.
- the control circuit is connected to the control switch K1 and the isolation switch K2 in each battery unit, and can control each access switch K1 and isolation switch K2 to be in the on state or the off state.
- the control circuit can connect the battery modules in the battery units to the first bus by controlling the access switch K1 and the isolation switch K2 in each battery unit.
- the control circuit can adjust the output voltage of the first bus to meet the voltage required by the load by controlling the battery modules in the N battery units in the battery cluster to connect to the first bus to provide power according to the first voltage required by the load. It is more flexible for the control circuit to adjust the output voltage of the first bus bar to the load, and the battery system can be applied to scenarios with different required voltages, which has a wide range of application scenarios and high adaptability to the scenarios.
- control circuit is further configured to: according to the correspondence between the voltage required by the load and the number of battery cells and the first voltage, determine that the number of battery cells corresponding to the first voltage is the Said N, wherein the correspondence relationship includes a plurality of voltages required by the load.
- the control circuit may determine the number of battery cells corresponding to the voltage required by the load according to the correspondence between the voltage and the number of battery cells.
- the control circuit can control the access switch K1 and the isolation switch K2 of the number of battery units in the battery cluster, so that the number of battery modules can be connected to the first bus for power supply, thereby adjusting the output voltage of the first bus.
- the method for the control circuit to adjust the output voltage of the first bus to meet the voltage required by the load is more flexible.
- the battery system further includes at least one battery module management circuit; the battery module management circuit is respectively connected to the battery cluster and the control circuit; the battery module management circuit uses Collecting the voltage and current of each battery unit in the connected battery clusters, and determining the SOH parameters of each battery module state of health based on the collected voltages and currents, so that the control circuit selects from the battery clusters according to the SOH parameters of each battery module.
- the N battery cells are selected.
- the battery system may include a battery module management circuit, which is used to collect the voltage and current of each battery module to determine the SOH parameters of each battery module, which can facilitate the control circuit according to the SOH parameters of each battery module. Select the battery module connected to the first bus from the battery cluster.
- control circuit is further configured to: determine the battery module to which The status category of the battery cells; based on the status category of each battery unit in the battery cluster, select the N battery cells from the battery cluster, so that the SOH of each battery module in the battery cluster is balanced.
- the control circuit can select N battery cells from all the battery cells included in the battery cluster according to the SOH status category of each battery cell and control the selection
- the battery modules in the output battery units are connected to the first bus to adjust the output voltage of the first bus, which can take into account the SOH state of each battery module and improve the use efficiency of each battery module.
- the battery module management circuit is specifically configured to periodically collect the voltage and current of each battery unit in the connected battery cluster, and determine the SOH parameters of each battery module based on the collected voltage and current, And provide the SOH parameter of the battery module to the control circuit; the control circuit is also used to: based on the last received SOH parameter of the battery module, update the battery cell to which the battery module belongs status category.
- the battery module management circuit can periodically determine the SOH of each battery module, and realize dynamic detection of the SOH of each battery module, so that the control circuit can dynamically update the status category of each battery unit, Based on the updated status category of each battery unit, the battery module connected to the first bus for adjusting the output voltage of the first bus is determined.
- the multiple state categories include a first state category and a second state category, and the SOH parameter range corresponding to the first state category does not overlap with the SOH parameter range corresponding to the second state category .
- the SOH parameter ranges corresponding to the first state category and the second state category do not overlap, so that the SOH state category of a battery module can be one of the first state category and the second state category, which is convenient for control
- the circuit manages each battery module.
- the battery module management circuit is respectively connected to the control terminal of the access switch K1 and the control terminal of the isolation switch K2 in each battery unit in the connected battery cluster;
- the module management circuit is also used to detect whether the battery module in each battery unit in the connected battery cluster is faulty; and when the battery module in the first battery unit is detected to be faulty, control the The access switch K1 and the isolating switch K2, so that the battery modules in the first battery unit are not connected to the battery modules in other battery units.
- the battery module management circuit may detect whether a battery module in a connected battery cluster is faulty. In the case of a battery module failure, the battery module management circuit can control the access switch K1 and the isolation switch K2 in the battery unit to which the failed battery module belongs, for example, control the access switch K1 to be in an open circuit state and isolate the The switch K2 is in the conducting state, so that the faulty battery module is isolated from the battery cluster, without affecting the operation of other battery modules in the battery cluster, and improving the availability of the battery system.
- the battery module management circuit is also used to detect whether the battery module in each battery unit in the connected battery cluster is faulty; and after detecting that the battery module in the first battery unit fails , providing the fault indication information carrying the identification of the first battery unit to the control circuit, so that the control circuit controls the battery modules in the second battery unit and the battery modules in other battery units connected.
- the battery module management circuit may detect whether a battery module in a connected battery cluster is faulty. When it is determined that the battery module is faulty, the information of the battery unit to which the faulty battery module belongs is provided to the control circuit so that the control circuit controls the access switch K1 and the isolation switch K2 in the battery unit, so that the faulty battery module isolated from the battery cluster. For example, in the case of a serious battery module failure, the battery module management circuit can isolate the failed battery group from the battery cluster in time.
- control circuit is further configured to: according to the third battery unit identifier in the received fault indication information, control the access switch in the third battery unit corresponding to the third battery unit identifier K1 and the isolating switch K2, so that the battery modules in the third battery unit are disconnected from the battery modules in other battery units.
- the control circuit can learn the information of the battery unit to which the faulty battery module belongs according to the received fault indication information, and the control circuit can adjust the access switch K1 and the isolation switch in the battery unit to which the faulty battery module belongs K2. For example, control the access switch K1 to be in the off-circuit state, and the isolation switch K2 to be in the on-state, so that the faulty battery module is isolated from the battery cluster, without affecting the operation of other battery modules in the battery cluster, and improving the availability of the battery system. Spend.
- the battery system further includes at least one high-voltage switch; the at least one battery cluster has a one-to-one correspondence with the at least one high-voltage switch, and the control circuit is connected to the control terminal of the high-voltage switch ;
- the battery cluster is connected to the corresponding high-voltage switch, the corresponding high-voltage switch is in the on state, the battery cluster is connected to the first bus bar, and the corresponding high-voltage switch is in the off state, the battery A cluster is disconnected from the first bus.
- control circuit can control the high-voltage switch connected to the battery cluster to be in a conducting state, so that the battery cluster is connected to the first bus bar, and the battery cluster can be discharged or charged through the first bus bar.
- the control circuit may also control the high-voltage switch connected to the battery cluster to be in an open circuit state, so that the battery cluster is not connected to the first bus.
- the battery system further includes at least one DC/DC conversion circuit; the at least one DC/DC conversion circuit corresponds to the at least one battery cluster; the battery cluster corresponds to the corresponding DC The first side of the DC/DC conversion circuit is connected, and the other side of the corresponding DC/DC conversion circuit is connected to the first bus; the DC/DC conversion circuit is used to modulate the output voltage of the battery cluster , and transmit the modulated voltage to the first bus.
- the DC/DC conversion circuit included in the battery system can modulate the output voltage of the battery cluster, and transmit the modulated voltage to the first bus, so as to supply power to the load connected to the first bus.
- the DC/DC conversion circuit is also used to modulate the voltage at the first bus to a charging voltage, so as to charge the connected battery clusters.
- the first bus in the battery system is connected to an external power source.
- Each battery cluster is used to store electrical energy.
- the DC/DC conversion circuit can modulate the voltage at the first bus to charge the battery cluster connected to it. It can be seen that the battery system can be applied not only to power supply scenarios, but also to backup power scenarios.
- the battery system further includes at least one high-voltage switch; the at least one battery cluster has a one-to-one correspondence with the at least one high-voltage switch, and the control circuit is connected to the control terminal of the high-voltage switch
- the battery cluster, the high-voltage switch corresponding to the battery cluster, and the DC/DC conversion circuit corresponding to the battery cluster are sequentially connected in series, the corresponding high-voltage switch is in a conducting state, and the battery cluster and the corresponding The DC/DC conversion circuit is connected, the corresponding high-voltage switch is in an open circuit state, and the battery cluster is not connected to the corresponding DC/DC conversion circuit.
- control circuit can control the high-voltage switch connected to the battery cluster to be in a conducting state, so that the battery cluster is connected to the corresponding DC/DC conversion circuit, so that the voltage provided by the DC/DC conversion circuit to the battery cluster Modulate and output to the first bus, or modulate the voltage at the first bus with a DC/DC conversion circuit and output to the battery cluster to charge the battery cluster.
- the control circuit can also control the high-voltage switch connected to the battery cluster to be in an open circuit state, so that the battery cluster is not connected to the corresponding DC/DC conversion circuit.
- the battery system further includes a DC/AC conversion circuit; the DC/AC conversion circuit is respectively connected to the first bus connection and the load; the DC/AC conversion circuit is used to convert the first The DC power at a bus bar is converted into AC power, and the AC power is provided to the load.
- the battery system may include a DC/AC conversion circuit, which may be applied in an AC power scenario.
- the present application provides a control method, which can be applied to a battery system, and the battery system includes a first bus, at least one battery cluster and a control circuit; each of the battery clusters is connected to the first bus respectively, The first bus bar is connected to the load; the battery cluster includes a plurality of battery units connected in series; each battery unit includes a battery module, an access switch K1 and an isolation switch K2; the access The switch K1 is connected in series with the battery module to form a first branch, and the isolation switch K2 is connected in parallel with the first branch; the method includes: controlling the battery according to the first voltage required by the load The access switch K1 and the isolating switch K2 of the N battery units in the cluster, so that the battery modules in the N battery units are connected to the first bus for power supply, and the output voltage of the first bus is meet the first voltage required by the load.
- the battery system further includes at least one battery module management circuit, the battery module management circuit is connected to the battery cluster, and is used to collect the voltage and current of each battery unit in the connected battery cluster
- the method further includes: determining the SOH parameters of each battery module state of health based on the collected voltage and current, and the SOH parameters are used to select the N battery cells from the battery cluster.
- the multiple state categories include a first state category and a second state category, and the SOH parameter range corresponding to the first state category does not overlap with the SOH parameter range corresponding to the second state category .
- the battery module management circuit is also used to periodically collect the voltage and current of each battery cell in the connected battery cluster; the method further includes: based on the last determined battery module The SOH parameter of the battery module is updated to update the status category of the battery unit to which the battery module belongs.
- the method further includes: determining the battery unit to which the battery module belongs according to the SOH parameter range corresponding to each state category in the preset multiple state categories and the SOH parameter of the battery module based on the status category of each battery unit in the battery cluster, selecting the N battery cells from the battery cluster to balance the SOH of each battery module in the battery cluster.
- the method further includes: detecting whether a battery module in each battery unit in the battery cluster is faulty; and when it is detected that a battery module in the first battery unit is faulty, controlling the The access switch K1 and the isolating switch K2 in the first battery unit prevent the battery modules in the first battery unit from communicating with the battery modules in other battery units.
- the technical effect of the corresponding solution in the second aspect can refer to the technical effect that can be obtained by the corresponding solution in the first aspect, and the repeated parts will not be described in detail.
- FIG. 1 is a schematic structural diagram of a conventional battery system
- FIG. 2 is a schematic structural diagram of a battery system
- Fig. 3 is a schematic diagram of different output voltages of the battery system
- FIG. 4 is a schematic structural diagram of a battery system
- Fig. 5 is a structural schematic diagram of a plurality of battery systems with different backup power durations
- FIG. 6 is a schematic structural diagram of multiple battery systems with different backup power durations.
- a battery system 1 includes N battery modules connected in series, and the battery system 1 provides a DC voltage VN.
- the battery system 2 includes M battery modules connected in series, and the battery system 2 provides a DC voltage VM.
- the number M of battery modules connected in series in the battery system 2 is smaller than the number N of battery modules connected in series in the battery system 1 , so the DC voltage VN is greater than the DC voltage VM.
- the DC voltage provided by the battery system 1 is higher, and can provide a DC voltage of a high voltage level (or provide a high voltage level).
- the DC voltage provided by the battery system 2 is relatively low, and can provide a DC voltage of a low voltage level (or provide a low voltage level).
- a plurality of battery modules connected in series can be called a battery cluster.
- Each battery system can also include a power conversion system (power conversion system, PCS) that can control the charging and discharging process of the battery cluster, and convert DC current to AC current, or convert AC current to DC current.
- PCS power conversion system
- the embodiment of the present application provides a battery system 100 that can provide various DC voltages, has a wide range of application scenarios, and has high adaptability to application scenarios. Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.
- the battery system may include a first bus bar and at least one battery cluster 20 .
- Each battery cluster 20 is respectively coupled to the first bus bar.
- the first bus bar may include a positive bus bar and a negative bus bar
- the positive pole of the battery cluster 20 may be connected to the positive bus bar
- the negative pole of the battery cluster 20 may be connected to the negative bus bar.
- each battery cluster 20 can output a voltage to the first bus, so the voltage at the first bus is determined based on the voltage output by each battery cluster 20 thereto. If the battery system includes one battery cluster 30 , the voltage at the first bus is the voltage output by the one battery cluster 20 . If the battery system includes multiple battery clusters 30 , the voltage at the first bus can be determined according to the output voltage of each battery cluster 20 .
- Each battery cluster 20 may include a plurality of battery cells 30 which are sequentially connected in series.
- the number of battery cells 30 included in each battery cluster 20 may be N, where N is an integer greater than or equal to 2.
- Each battery unit 30 may include a battery module, an access switch K1 and an isolation switch K2.
- the access switch K1 is connected in series with the battery module to form a first branch, and the isolation switch K2 is connected in parallel with the first branch.
- the first end k1a of the access switch K1 is connected to the first end k2a of the isolation switch K2 , which may serve as the first end of the battery unit 30 .
- the second end k1b of the access switch K1 is connected to the first end a1 of the battery module.
- the second terminal a2 of the battery module is connected to the second terminal k2b of the isolating switch K2, which can be used as the second terminal of the battery unit 30 .
- a battery module can also be called a battery module, electrical box or battery pack.
- a battery module may include multiple cells (energy storage batteries). Multiple cells can be connected in series or in parallel.
- the battery module may include a single board, a temperature sensor, a voltage sensor and other components for managing the battery module.
- the battery module can also include a battery management system and the like.
- the battery module may include a battery state monitoring controller.
- the battery state monitoring controller can be coupled with each energy storage battery to manage the health status of each energy storage battery.
- the first terminal a1 of each battery module can be a positive terminal, and the second terminal a2 can be a negative terminal.
- the first terminal a1 of each battery module can be a negative terminal, and the second terminal a2 can be a positive terminal.
- the first terminal a1 of each battery module is a positive terminal, and the second terminal a2 is a negative terminal as an example for illustration.
- a plurality of battery cells 30 may be sequentially connected in series.
- the second terminal of the previous battery unit 30 is connected to the first terminal of the latter battery unit 30 .
- the second end of the last battery unit 30 is not connected to other battery units 30 .
- the first end of the first battery unit 30 is not connected to other battery units 30 .
- the first terminal of the first battery unit 30 in the battery cluster 20 is also the first terminal of the battery cluster 20
- the second terminal of the last battery unit 30 is also the second terminal of the battery cluster 20 .
- the first terminal and the second terminal of the battery cluster 20 are respectively connected to the positive input terminal and the negative input terminal of the load.
- the battery system 100 may further include a control circuit, and the control circuit may be connected to the control terminal of the access switch K1 and the control terminal of the isolation switch K2 in each battery unit 30 in each battery cluster 20 .
- the control circuit can control the access switch K1 to be in a conducting state, or to be in a disconnecting state.
- the control circuit can also control the isolating switch K2 to be in a conducting state, or to be in a disconnecting state.
- the first bus bar can be connected to a load.
- the control circuit can adjust the battery cluster 20 to output various voltages to the first bus by controlling the state of the access switch K1 and the isolation switch K2 in each battery unit 30 in the battery cluster 20, so that the battery system 100 can be used as a load Various voltage levels are available. For example, the voltage required by the load is V1, and the control circuit can control the access switch K1 and the isolation switch K2 of the N1 battery units in the battery cluster, so that the battery modules in the N1 battery units can be connected to the first bus for power supply. Make the voltage output from the first bus bar to the load meet the voltage V1 required by the load.
- the control circuit can control the access switch K1 and the isolation switch K2 of the N2 battery units in the battery cluster, so that the battery modules in the N2 battery units are connected to the first bus for power supply,
- the voltage output from the first bus to the load can meet the voltage V2 required by the load.
- the control circuit controls the output voltage of one of the battery clusters included in the battery system 100 .
- the battery unit 30 communicates with the first end of the battery cluster 20 and communicates with the second end of the battery cluster 20, which can be recorded as that the battery unit 30 is in the online state, that is, the battery
- the battery modules in unit 30 are connected to the first bus. If the battery unit 30 fails to communicate with the first end of the battery cluster 20, or fails to communicate with the second end of the battery cluster 20, it can be recorded as that the battery unit 30 is in an offline state, that is, the battery module in the battery unit 30 is not connected. into the first bus.
- the battery modules in the battery unit 30 are in the online state.
- the battery module in the battery unit 30 is connected to the first bus bar, that is, it is connected to the load of the battery system (such as DC/DC converter, DC/AC converter, power conversion system, power load, power supply device, etc.)
- the current provided by the battery cell 30 may be transferred to the first end or the second end of the battery pack 20 , or the current at the first end or the second end of the battery pack 20 may be transferred to the battery cell 30 .
- the battery module in the battery unit 30 is in the offline state.
- the battery modules in the battery unit 30 are not connected to the loop connected to the load of the battery system, and cannot be charged or discharged through the loop. In other words, the current provided by the battery cells 30 cannot be transferred to the first terminal or the second terminal of the battery cluster 20 , or the current at the first terminal or the second terminal of the battery cluster 20 can be transmitted to the battery cells 30 .
- control circuit can adjust the state of the battery unit 30 in the online state or the offline state by controlling the state of the access switch K1 and the isolation switch K2 in the battery unit 30, that is, to realize the adjustment of the battery module in the battery unit 30 Connected to the first bus or not connected to the first bus.
- the control circuit adjusts the battery unit 30 to be in the online state, it can control the access switch K1 in the battery unit 30 to be in the on state, and the isolation switch K2 to be in the off state.
- the control circuit adjusts that the battery unit 30 is in the offline state, it can control the access switch K1 in the battery unit 30 to be in the off state and the isolating switch K2 to be in the on state.
- the control circuit can control the access switch K1 and the isolating switch K2 in each battery unit 30 to adjust the number of battery units 30 in the battery cluster 20 connected to the first end and the second end of the battery cluster 20, and also to adjust the number of battery units 30 in the battery cluster 20.
- the number of battery modules connected to the first bus Because the number of battery cells 30 connected to the first end and the second end of the battery cluster 20 is different, the output voltages of the battery cluster 20 are different. In other words, the number of battery modules connected to the first bus in the battery cluster 20 is different, so that the voltage output from the battery cluster 20 to the first bus can be different.
- control circuit can adjust the output voltage of the battery cluster 20 by adjusting the number of online battery cells 30 in the battery cluster 20 .
- the control circuit can adjust the voltage output from the battery cluster 20 to the first bus bar by adjusting the number of battery modules in the battery cluster 20 connected to the first bus bar for power supply.
- the battery modules of all battery units 30 in the battery cluster 20 are in the online state, that is, all the battery modules in the battery cluster 20 are connected to the first bus for power supply, and the output voltage of the battery cluster 20 is The maximum output voltage of the battery pack 20 .
- the control circuit can adjust the battery modules in each battery unit 30 in the battery cluster 20 to be in an online state.
- the control circuit may control the access switch K1 in each battery unit 30 in the battery cluster 20 to be in the ON state, and the isolation switch K2 to be in the OFF state.
- the voltage between the first terminal and the second terminal of the battery cluster 20 is the maximum output voltage.
- the battery modules of all the battery units 30 in the battery cluster 20 are offline, that is, all the battery modules in the battery cluster 20 are not connected to the first bus, and the output voltage of the battery cluster 20 is zero.
- the control circuit can adjust the battery modules in each battery unit 30 in the battery cluster 20 to be offline.
- the control circuit may control the access switch K1 of each battery unit 30 in the battery cluster 20 to be in the off state, and the isolation switch K2 to be in the on state. In this case, the voltage between the first terminal and the second terminal of the battery cluster 20 is zero.
- the control circuit can adjust the battery modules in the N1 battery units 30 in the battery cluster 20 to be all online, that is, control the battery modules in the N1 battery units to connect to the first A bus is used to supply power, and the battery modules in the battery cluster 20 other than the battery modules in the N1 battery units 30 are not connected to the first bus, so that the battery cluster can provide the voltage to the first bus, that is, The voltage output by the first bus bar to the load meets the voltage V1 required by the load.
- the output voltage of the first bus can be adjusted by the control circuit by adjusting the number of battery modules connected to the first bus.
- control circuit can adjust the battery modules in the N1 battery units 30 in the battery cluster 20 to be all online.
- the total number of all battery units 30 in the battery cluster 20 can be recorded as P
- N1 can be an integer in the set A
- the set A can be [0, P].
- the control circuit can adjust other battery units in the battery cluster 30 except the aforementioned N1 battery units 30 to be offline, that is, the other P-N1 battery units are offline.
- the control circuit can control the access switch K1 in the N1 battery units 30 in the battery cluster 20 to be in the on state, the isolation switch K2 to be in the off state, and the access switch K1 in the P-N1 battery units 30 to be in the off state, to isolate
- the switch K2 is in the ON state, so that the battery modules in the N1 battery units 30 are all connected to the first bus, and the battery modules in the P-N1 battery units 30 are not connected to the first bus.
- the voltage between the first terminal and the second terminal of the battery cluster 20 is the sum of the voltages provided by the battery modules in the N1 battery units 30 .
- the control circuit can adjust the voltage provided by the battery cluster 20 to the first bus by adjusting the number of battery modules connected to the first bus for power supply in the battery cluster 20, that is, to adjust the output of the first bus to the load. Voltage.
- the first bus in the battery system 100 is coupled to the load.
- the output voltages of each battery cluster are the same, that is, the operating states of each battery cluster are the same. In other words, the number of online battery cells in each battery cluster is the same.
- the output voltage of each battery cluster is the maximum output voltage
- the output voltage of the battery system 100 is the maximum total system voltage.
- the battery system 100 includes at least one DC/DC conversion circuit.
- the at least one DC/DC conversion circuit 50 is in one-to-one correspondence with the at least one battery cluster.
- Each battery cluster 20 is connected to the first bus through a corresponding DC/DC conversion circuit 50 .
- the first end of the battery cluster 20 can be connected to the first end b1 of the corresponding DC/DC conversion circuit 50, and the second end of the battery cluster 20 can be connected to the second terminal b1 of the corresponding DC/DC conversion circuit 50.
- Terminal b2 is connected.
- the third terminal C of each DC/DC conversion circuit 50 is coupled to the first bus.
- the DC/DC conversion circuit 50 can form a charging and discharging circuit with corresponding battery clusters.
- the DC/DC conversion circuit 50 may include but not limited to one or more of the following circuits: a linear regulated power supply circuit, a step-down (Buck) conversion circuit, a boost (Boost) conversion circuit, a buck-boost (Buck- Boost) conversion circuit, three-level step-down (Buck) conversion circuit, switched capacitor conversion circuit, LLC resonant conversion circuit, dual active full bridge DC-DC (dual active bridge, DAB) conversion circuit, forward
- a linear regulated power supply circuit a step-down (Buck) conversion circuit, a boost (Boost) conversion circuit, a buck-boost (Buck- Boost) conversion circuit, three-level step-down (Buck) conversion circuit, switched capacitor conversion circuit, LLC resonant conversion circuit, dual active full bridge DC-DC (dual active bridge, DAB) conversion circuit, forward
- DAB dual active bridge DC-DC
- the battery system 100 may be used to store electrical energy.
- each DC/DC conversion circuit 50 can modulate the voltage at the first busbar into a charging voltage and provide it to the connected battery cluster 20 to charge the connected battery cluster 20.
- Clusters 20 may store electrical energy.
- the battery system 100 may be used to provide electrical energy.
- each DC/DC conversion circuit 50 can modulate the voltage output by the connected battery cluster 20, output the modulated voltage to the first bus, and provide it to the load to The battery system 100 is implemented to provide electric energy for loads.
- the DC/DC conversion circuit 50 modulates the maximum output voltage output by the connected battery cluster 20, and the modulated voltage is the DC/DC conversion
- the corresponding modulated maximum voltage also referred to as the maximum discharge voltage
- the output voltage of each DC/DC conversion circuit 50 is the corresponding modulated maximum voltage
- the output voltage of the battery system 100 is the maximum total system voltage.
- the control circuit can be connected to the control terminal of the DC/DC conversion circuit 50 , and the DC/DC conversion circuit 50 can perform voltage modulation (conversion).
- the DC/DC conversion circuit 50 includes one or more switch tubes, and the control terminal of the DC/DC conversion circuit 50 may include control electrodes (gates) of these switch tubes.
- the control circuit can be a logic circuit with logic operation capability, which can generate a control signal, and through the control signal, each switch tube in the DC/DC conversion circuit 50 is turned on or off, so that the DC/DC conversion circuit 50 realizes voltage conversion.
- the control circuit can pre-store the output voltage of the battery system 100 (total system voltage, load required voltage, etc.) The corresponding relationship between the number of groups). For example, the total system voltage output by the battery system 100 is U1, and the corresponding number of battery cells is num1. The total system voltage output by the battery system 100 is U2, and the corresponding number of battery cells is num2.
- the battery system 100 may include a display component, a button, etc., and the voltage adjustment command may be triggered through a button or a menu in a display interface.
- the voltage adjustment instruction may be sent to the control circuit by an external device (device other than the battery system).
- the control circuit can receive the voltage adjustment instruction.
- the voltage adjustment command may carry information used to indicate the voltage required by the load connected to the first bus (referred to as the first voltage for convenience of description).
- the voltage adjustment command can be used to instruct the control circuit to adjust the number of battery cells in the online state (the included battery modules are connected to the first bus bar) in each battery cluster, so that the output voltage of the first bus bar meets the first voltage, such as The output voltage of the first bus is the first voltage, or close to the first voltage (the load connected to the first bus can operate normally).
- the first voltage carried by the voltage adjustment command may be a value between the maximum value of the total system voltage output by the battery system 100 and zero.
- the control circuit may receive a first adjustment instruction (also called a maximum output voltage instruction), which is used to instruct the control circuit to adjust the output voltage of the battery system 100 to the maximum system total voltage of the battery system 100 .
- a first adjustment instruction also called a maximum output voltage instruction
- the control circuit can adjust the output voltage of all battery clusters 20 to the maximum output voltage of each battery cluster 20, so that the output voltage of the first bus bar is the maximum output voltage, that is, the voltage provided by the battery system 100 It may be the maximum output voltage of the battery system 100 .
- control circuit may receive a second adjustment instruction (also called a stop output voltage instruction), the second adjustment instruction is used to instruct the control circuit to adjust the output voltage of the battery system 100 to zero.
- the control circuit can adjust the output voltages of all battery clusters 20 to be zero, and the voltage at the first bus bar to be zero, that is, the voltage provided by the battery system 100 to be zero.
- control circuit may receive a third adjustment instruction (also referred to as an output specified voltage instruction), which is used to instruct the control circuit to adjust the output voltage of the battery system 100 to a specified voltage.
- a third adjustment instruction also referred to as an output specified voltage instruction
- the control circuit can adjust the number of battery units 30 in the online state in all battery clusters 20 (the number of battery modules connected to the first bus for power supply in all battery clusters 20), so that The output voltage of the first bus bar is a specified voltage.
- control circuit can be based on pre-storing the output voltage of the battery system 100 (total system voltage, voltage required by the load, etc.)
- the corresponding relationship is to determine the number of battery cells corresponding to the first voltage.
- the number of battery cells corresponding to the first voltage is recorded as the first number.
- the control circuit can select a first number of M battery cells 30 from the first battery cluster, and adjust the selected first number of battery cells 30 to be at online status.
- the control circuit can control the access switch K1 in the selected first number of battery units 30 to be in the on state, and the isolation switch K2 to be in the off state, so that the batteries in the first number of battery units 30 The module is connected to the first bus.
- the access switches K1 in the battery units other than the first number of battery units 30 are in an open circuit state, and the isolation switch K2 is in a conductive state, so that all but the first number of battery cells in the first battery cluster
- the battery modules in the battery units 30 other than the first battery unit 30 are not connected to the first bus.
- control circuit may randomly select the first number of battery cells from the first battery cluster, or arbitrarily select the first number of battery cells from the first battery cluster.
- the control circuit can select a first number of battery cells from the first battery cluster according to a preset selection method.
- the control circuit controls the battery modules in all battery cells 30 in the first battery cluster to access first busbar.
- the control circuit may control the access switches K1 in all battery units 30 to be in the on state, and the isolation switches K2 to be in the off state.
- the output voltage of the first battery cluster is In the case of (as shown in part (b) of Figure 3), the control circuit controls the The battery modules in each battery unit 30 are connected to the first bus bar, except the The battery modules in the battery units 30 other than the first battery unit 30 are not connected to the first bus.
- the control circuit can control the circuit in the first battery cluster
- the access switch K1 in each battery unit 30 is in the on state, and the isolation switch K2 is in the off state, except the The access switch K1 in the other battery units 30 other than the first battery unit 30 is in the off state, and the isolation switch K2 is in the on state.
- the output voltage of the first battery cluster is In the situation (as shown in part (c) of Figure 3), the control circuit controls the The battery modules in each battery unit 30 are connected to the first bus bar, except the The battery modules in the battery units 30 other than the first battery unit 30 are not connected to the first bus.
- the control circuit controls the The access switch K1 in each battery unit 30 is in the on state, and the isolation switch K2 is in the off state, except the The access switch K1 in the other battery units 30 other than the first battery unit 30 is in the off state, and the isolation switch K2 is in the on state.
- the control circuit can control the battery modules in each battery unit 30 in the first battery cluster to be in the online state (connected to the first bus bar) or offline state (not connected to the first bus bar), so as to realize the adjustment of the first The voltage provided by the battery cluster to the first bus, thereby adjusting the output voltage of the first bus. Therefore, the first battery cluster can be used in application scenarios where the required voltage level does not exceed the maximum output voltage of the first battery cluster. It can be seen that the battery system 100 provided by the embodiment of the present application can satisfy various DC voltage levels required by different scenarios, instead of the scenario where the traditional battery system only applies to a single DC voltage level.
- the battery system 100 may include at least one high voltage switch 40 .
- the number of the at least one high voltage switch 40 may be the same as the number of the at least one battery cluster.
- the at least one high voltage switch 40 may have a one-to-one correspondence with the at least one battery cluster.
- the battery cluster 20 may be connected to a corresponding one of the high voltage switches 40 .
- the battery cluster 20 may be connected to the first bus bar via a high voltage switch.
- the first end of the battery cluster 20 , the corresponding high voltage switch 40 and the first end of the corresponding DC/DC conversion circuit are connected in series in sequence.
- the second end of the battery pack 20 is connected to the second end of the DC/DC conversion circuit.
- the third end of the DC/DC conversion circuit is connected to the first bus.
- the battery system 100 may include a DC/AC conversion circuit, and the battery system 100 may be applied to an AC power consumption scenario.
- the first bus bar is connected to the input side of the DC/AC conversion circuit, and the output side of the DC/AC conversion circuit is connected to the load.
- the DC/AC conversion circuit can process the DC power on the first bus into AC power and provide it to the load.
- the load may be a power conversion system.
- the battery system 100 may also include one or more battery module management circuits 50 .
- the battery system 100 includes a battery module management circuit 60, and each battery module in each battery cluster 20 can be coupled with the battery module management circuit 60, and the battery module management circuit 60 It is used to collect the voltage and current of each battery unit 30 in the connected battery cluster, and determine the SOH parameters of each battery module based on the collected voltage and current.
- the battery module management circuit 60 may adopt any existing method for determining the SOH of the battery module, and determine the SOH parameters of each battery module based on the collected voltage and current.
- the battery module management circuit 60 may also include a memory for storing the data required for determining the SOH parameters of each battery module, such as the collected data such as the voltage value and current value of the battery module, and may also store the rated parameters of the battery module For example, the internal resistance of the battery module, etc., can also store the historical parameters of the battery module, such as the SOH parameter of the battery module determined last time.
- the battery system 100 may also include multiple battery module management circuits 60 .
- the plurality of battery clusters 20 may have a one-to-one correspondence with the plurality of battery module management circuits 60 .
- the battery pack 20 is coupled with a corresponding battery module management circuit 60 .
- the battery module management circuit 60 can be coupled with each battery module in the corresponding battery cluster 20, and can collect the voltage and current of each battery unit in the connected battery cluster, and determine the battery module voltage and current based on the collected voltage and current. Health status SOH parameters.
- the battery system 100 includes multiple battery module management circuits 60 as an example for description.
- the battery module management circuit 60 can be integrated in the BMS.
- the battery module management circuit 60 can be a battery management system (battery management system, BMS).
- BMS battery management system
- the battery module management circuit 60 can also perform functions other than determining the SOH parameters of each battery module, for example, detecting the temperature of the battery module.
- the control circuit can be coupled with each battery module management circuit 60 .
- the control circuit may be connected to the battery module management circuit 60 through a bus, and exchange data or information through the bus.
- the control circuit may receive the SOH parameters of each battery module provided by each battery module management circuit 60 .
- the SOH parameters of each battery module determined by the battery module management circuit 60 can be used by the control circuit to select battery cells from the battery cluster according to the SOH parameters of each battery module.
- the battery module management circuit 60 can periodically determine the SOH parameters of each battery module, and send it to the control circuit, so that the control circuit can periodically obtain the SOH parameters of each battery module.
- each battery module management circuit 60 can collect the voltage and current of each battery module according to a set period, determine the SOH parameter of each battery module, and send it to the control circuit, so that the control circuit can periodically Obtain the SOH parameters of each battery module.
- the granularity of the set period may be hours, minutes, seconds and so on.
- the control circuit can determine the first battery cluster according to the SOH ranges of at least two state categories and the SOH parameters of each battery module in the first battery cluster.
- the at least two status categories may include a first status category and a second status category
- the SOH range corresponding to the first status category may be denoted as set B1
- the SOH range corresponding to the second status category may be denoted as Set B2.
- set B1 and set B2 have no overlapping elements, so that a battery module has only one status category.
- the status category of a battery module may be used as the status category of the battery unit to which the battery module belongs.
- the control circuit can receive (or obtain) the SOH parameters of each battery module in the first battery cluster, and can determine the state category of each battery unit in the first battery cluster according to the SOH range of the at least two state categories, or , to update the status category of each battery cell in the first battery cluster. It can be understood that the status category of a battery module can be changed dynamically, or the status category of a battery unit can be changed dynamically.
- the control circuit may select the first battery unit from the battery units whose state category is the third state category based on the current state category of each battery unit in the first battery cluster (also the state category of each battery module determined by the control circuit last time). A number of battery cells.
- the third status category may be the first status category or the second status category. That is, the control circuit can select a first number of battery cells from a state category. For example, a first number of battery cells are selected from all battery cells whose status category is the first status category. Or, select the first number of battery cells from all the battery cells whose state is classified as the second state category.
- the control circuit may determine the difference dn between num1 and the first number, and obtain The number of selected battery cells of the four state categories (a state category other than the third state category among the plurality of state categories) is the difference value dn battery cells.
- the control circuit can control all the battery units in the third state category and the battery modules in the difference dn battery units to connect to the first bus, and the battery modules in other battery units are not connected to the first bus.
- the control circuit is controlling all the battery units in the first battery cluster whose state category is the third state category and the battery modules in the difference dn battery units to connect to the first bus, and the other batteries
- the battery module management circuit 60 corresponding to the first battery cluster can determine the SOH parameters of each battery module in the first battery cluster, and set the SOH parameters of each battery module to sent to the control circuit.
- the control circuit can re-determine the status category of each battery module in the first battery cluster, that is, determine the status category of each battery unit.
- the control circuit may reselect a first number of battery units from the first battery cluster based on the re-determined state category of each battery unit, and control the access of battery modules in the reselected first number of battery units
- the first bus bar, the battery modules in other battery units in the first battery cluster are not connected to the first bus bar.
- each battery unit can be controlled to dynamically connect to the first battery cluster, and each battery module can be put into each battery module in turn.
- the SOH of each battery module is balanced, or the SOH is consistent.
- the battery module management circuit 60 can also detect whether the battery module in each battery unit 30 in the connected battery cluster is faulty. For example, the battery module management circuit 60 detects at least one of overvoltage fault, overcurrent fault, overtemperature fault, or internal short circuit fault in the battery module.
- the battery module management circuit 60 can be connected with the access switch K1 and the isolation switch K2 of each battery unit 30 in the connected battery cluster, and controls the on or off state of each switch. If the battery module management circuit 60 detects that the battery module in the first battery unit fails, it can control the access switch K1 in the first battery unit to be in the on state, and the isolating switch K2 to be in the off state, so that the fault occurs. The faulty battery module is isolated from the battery cluster without affecting the operation of other battery modules in the battery cluster, improving the availability of the battery system.
- the battery module management circuit 60 can send failure indication information including the identification of the failed battery module to the control circuit, so that the control circuit can learn the identification of the failed battery module. For example, sending fault indication information carrying the first battery unit identifier to the control circuit.
- the battery module management circuit 60 may include multiple sub-management circuits.
- the multiple sub-management circuits correspond one-to-one to the multiple battery units 30 in the battery cluster connected to the battery module management circuit 60 .
- the sub-management circuit is connected with the access switch K1 and the isolation switch K2 of the corresponding battery unit 30 to control the on or off state of each switch.
- the sub-management circuit can be used for whether the battery module in the corresponding battery unit fails. If the sub-management circuit detects that the battery module in the first battery unit fails, it can control the access switch K1 in the first battery unit to be in the on state, and the isolation switch K2 to be in the off state, so that the failed battery can Modules are isolated from battery clusters.
- the battery module management circuit 60 can also detect whether the battery module in each battery unit 30 in the connected battery cluster is faulty. If a failure of the battery module in the second battery unit is detected, failure indication information may be sent to the control circuit, wherein the failure indication information may include an identification of the second battery unit. After receiving the fault indication information, the control circuit can adjust the battery unit corresponding to the identification in the fault indication information to be in an offline state. For example, the second battery unit is adjusted to be offline. In such a design, the failed battery module is isolated from the battery cluster, which does not affect the operation of other battery modules in the battery cluster and improves the availability of the battery system.
- the control circuit After the control circuit receives the fault indication information, it may no longer adjust the state of the battery unit corresponding to the identification included in the fault indication information, or no longer control the access switch K1 and the isolation switch K1 in the battery unit to which the faulty battery module belongs. Switch K2. In other words, when the control circuit selects the first number of battery units from the first battery cluster, the selected first number of battery units does not include a failed battery unit.
- the battery system 100 provided in the embodiment of the present application can not only meet the diversified DC voltage levels required by different scenarios, but also meet the diversified backup power duration required by different scenarios.
- each battery cluster of the traditional battery system includes k battery modules connected in series, and the maximum output voltage of each battery cluster is Please refer to Figure 5, assuming that s battery clusters can provide 1h backup power, that is, they can be charged with constant power for 1 hour or discharged with constant power for 1 hour. If the traditional battery system includes 2s parallel battery clusters, the traditional battery system can provide 2h backup power. If the traditional battery system includes 4s parallel battery clusters, the traditional battery system can provide 4h backup power.
- each battery cluster 20 may include P battery cells 30, and each battery cell 30 includes a battery module. Therefore, each battery cluster 20 includes P battery modules. In the embodiment of the present application, P may be 2 times of k.
- the battery system 100 includes A battery cluster 20 connected in parallel can provide 1h backup power.
- the battery system 100 includes s battery clusters 20 connected in parallel to provide 2h backup power.
- the battery system 100 includes 2s battery clusters 20 connected in parallel to provide 4h backup power.
- the battery clusters in the battery system 100 can output high voltage levels and be applied in scenarios requiring low voltage levels, because each battery cluster 20 has a higher capacity.
- the battery system 100 provided by the embodiment of the present application can include a smaller number of battery clusters, and thus can reduce the number of high-voltage switches, cables, backup switches, etc. The number of devices achieves a reduction in the cost of the battery system.
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Abstract
Description
Claims (18)
- 一种电池系统,其特征在于,包括第一母线、至少一个电池簇和控制电路;每个所述电池簇分别与所述第一母线连接,所述第一母线与负载连接;所述电池簇包括多个电池单元,所述多个电池单元串联连接;每个电池单元包括电池模组、接入开关K1和隔离开关K2;所述接入开关K1与所述电池模组串联连接形成第一支路,所述隔离开关K2与所述第一支路并联;所述控制电路连接所述接入开关K1和所述隔离开关K2的控制端,用于:根据所述负载所需的第一电压,控制所述电池簇中N个电池单元的所述接入开关K1和所述隔离开关K2,以使所述N个电池单元中的电池模组接入所述第一母线进行供电,所述第一母线输出电压满足所述负载所需的第一电压。
- 如权利要求1所述的电池系统,其特征在于,所述控制电路还用于:根据所述负载所需的电压与电池单元数量的对应关系和所述第一电压,确定所述第一电压相应的电池单元数量为所述N,其中,所述对应关系中包括多个所述负载所需的电压。
- 如权利要求1或2所述的电池系统,其特征在于,所述电池系统还包括至少一个电池模组管理电路;所述电池模组管理电路分别与所述电池簇和所述控制电路连接;所述电池模组管理电路,用于采集连接的电池簇中各电池单元的电压和电流,基于采集的电压和电流确定各电池模组健康状态SOH参数,以使所述控制电路根据各电池模组SOH参数从所述电池簇中选择所述N个电池单元。
- 如权利要求3所述的电池系统,其特征在于,所述控制电路还用于:根据预设的多个状态类别中各状态类别对应的SOH参数范围以及所述电池模组的SOH参数,确定所述电池模组所属的电池单元的状态类别;基于所述电池簇中各电池单元的状态类别,从所述电池簇中选择所述N个电池单元,以使所述电池簇中的各电池模组的SOH均衡。
- 如权利要求4所述的电池系统,其特征在于,所述电池模组管理电路,具体用于周期性地采集连接的电池簇中各电池单元的电压和电流,基于采集的电压和电流确定各电池模组健康状态SOH参数,以及将所述电池模组健康状态SOH参数提供给所述控制电路;所述控制电路,还用于:基于最近一次接收的所述电池模组的SOH参数,更新所述电池模组所属的电池单元的状态类别。
- 如权利要求3-5中任一所述的电池系统,其特征在于,所述多个状态类别包括第一状态类别和第二状态类别,且所述第一状态类别对应的SOH参数范围与所述第二状态类别对应的SOH参数范围不重叠。
- 如权利要求3-6中任一所述的电池系统,其特征在于,所述电池模组管理电路分别与连接的电池簇中的各电池单元中的所述接入开关K1的控制端和所述隔离开关K2的控制端连接;所述电池模组管理电路,还用于检测连接的电池簇中各电池单元中的电池模组是否故障;以及在检测到第一电池单元中的电池模组发生故障时,控制所述第一电池单元中的所述接入开关K1和所述隔离开关K2,以使所述第一电池单元中的电池模组与其它电池单元中的电池模组之间不连通。
- 如权利要求3-6中任一所述的电池系统,其特征在于,所述电池模组管理电路还用于检测连接的电池簇中各电池单元中的电池模组是否故障;以及在检测到第二电池单元中的电池模组发生故障后,将包括所述第二电池单元标识的故障指示信息提供给所述控制电路,以使所述控制电路控制所述第二电池单元中电池模组与其它电池单元中的电池模组之间不连通。
- 如权利要求8所述的电池系统,其特征在于,所述控制电路,还用于:根据接收的故障指示信息中的第三电池单元标识,控制所述第三电池单元标识对应的第三电池单元中的所述接入开关K1和所述隔离开关K2,以使所述第三电池单元中的电池模组与其它电池单元中的电池模组之间不连通。
- 如权利要求1-9中任一所述的电池系统,其特征在于,还包括至少一个高压开关;所述至少一个电池簇与所述至少一个高压开关具有一一对应关系,所述控制电路与所述高压开关的控制端连接;所述电池簇与相应的高压开关连接,所述相应的高压开关处于导通状态下,所述电池簇与所述第一母线连通,所述相应的高压开关处于断路状态下,所述电池簇与所述第一母线不连通。
- 如权利要求1-9中任一所述的电池系统,其特征在于,还包括至少一个直流/直流变换电路;所述至少一个直流/直流变换电路分别与所述至少一个电池簇一一对应;所述电池簇与对应的直流/直流变换电路的第一侧连接,所述对应的直流/直流变换电路的另一侧与所述第一母线连接;所述直流/直流变换电路用于对所述电池簇的输出电压进行调制,并将调制后的电压传输至所述第一母线。
- 如权利要求11所述的电池系统,其特征在于,所述直流/直流变换电路还用于将所述第一母线处的电压调制为充电电压,以为连接的电池簇充电。
- 如权利要求11或12所述的电池系统,其特征在于,还包括至少一个高压开关;所述至少一个电池簇与所述至少一个高压开关具有一一对应关系,所述控制电路与所述高压开关的控制端连接;所述电池簇、所述电池簇对应的高压开关、所述电池簇对应的直流/直流变换电路依次串联连接,所述对应的高压开关处于导通状态下,所述电池簇与所述对应的直流/直流变换电路连通,所述对应的高压开关处于断路状态下,所述电池簇与所述对应的直流/直流变换电路不连通。
- 如权利要求1-13中任一所述的电池系统,其特征在于,还包括直流/交流变换电路;所述直流/交流变换电路分别连接所述第一母线和所述负载;所述直流/交流变换电路用于将所述第一母线处的直流电转换为交流电后,并将所述交流电提供给所述负载。
- 一种控制方法,其特征在于,应用于电池系统,所述电池系统包括第一母线、至少一个电池簇和控制电路;每个所述电池簇分别与所述第一母线连接,所述第一母线与负载连接;所述电池簇包括多个电池单元,所述多个电池单元串联连接;每个电池单元包括电池模组、接入开关K1和隔离开关K2;所述接入开关K1与所述电池模组串联连接形成第一支路,所述隔离开关K2与所述第一支路并联;所述方法包括:根据所述负载所需的第一电压,控制所述电池簇中N个电池单元的所述接入开关K1和所述隔离开关K2,以使所述N个电池单元中的电池模组接入所述第一母线进行供电,所述第一母线输出电压满足所述负载所需的第一电压。
- 如权利要求15所述的方法,其特征在于,所述电池系统还包括至少一个电池模组管理电路,所述电池模组管理电路与所述电池簇连接,用于采集连接的电池簇中各电池单元的电压和电流;所述方法还包括:基于采集的电压和电流确定各电池模组健康状态SOH参数,所述SOH参数用于从所述电池簇中选择所述N个电池单元。
- 如权利要求16所述的方法,其特征在于,所述方法还包括:根据预设的多个状态类别中各状态类别对应的SOH参数范围以及所述电池模组的SOH参数,确定所述电池模组所属的电池单元的状态类别;基于所述电池簇中各电池单元的状态类别,从所述电池簇中选择所述N个电池单元,以使所述电池簇中的各电池模组的SOH均衡。
- 如权利要求15或16所述的方法,其特征在于,所述方法还包括:检测所述电池簇中各电池单元中的电池模组是否故障;以及在检测到第一电池单元中的电池模组发生故障时,控制所述第一电池单元中的所述接入开关K1和所述隔离开关K2,以使所述第一电池单元中的电池模组与其它电池单元中的电池模组之间不连通。
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CN108377023A (zh) * | 2018-05-14 | 2018-08-07 | 深圳市华思旭科技有限公司 | 启动电源 |
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CN116760153A (zh) * | 2023-08-17 | 2023-09-15 | 中宏科创新能源科技(浙江)有限公司 | 一种集成电池管理和变流控制的储能系统 |
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CN117690329A (zh) * | 2024-02-02 | 2024-03-12 | 深圳风向标教育资源股份有限公司 | 动力电池管理系统开发实训平台及其布局方法 |
CN117690329B (zh) * | 2024-02-02 | 2024-05-03 | 深圳风向标教育资源股份有限公司 | 动力电池管理系统开发实训平台及其布局方法 |
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