CN112886153A - Energy storage battery module, energy storage battery cluster and energy storage battery system - Google Patents
Energy storage battery module, energy storage battery cluster and energy storage battery system Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
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- WVSNNWIIMPNRDB-UHFFFAOYSA-N 1,1,1,3,3,4,4,5,5,6,6,6-dodecafluorohexan-2-one Chemical compound FC(F)(F)C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F WVSNNWIIMPNRDB-UHFFFAOYSA-N 0.000 description 1
- 206010000369 Accident Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides an energy storage battery module, an energy storage battery cluster and an energy storage battery system. The energy storage battery module comprises a plurality of battery monomers and a slave control module; the battery monomers are connected together in series and/or parallel to form a positive terminal and a negative terminal; the positive end is connected with a contactor in series, and the contactor comprises a contact and a coil; the contactor is normally open; and the slave control module drives the coil to be electrified or not. Only when the energy storage battery module works normally and has no fault, the coil is electrified, the contactor is closed, and voltage can be output outwards; when the faults of battery thermal runaway, loop overcurrent or overvoltage and the like occur, the coil loses power, the contactor is disconnected, no voltage is output externally, whether the external output is controlled within the range of the energy storage battery module is realized, the response and control protection capability to the faults can be improved, and the safety is improved.
Description
Technical Field
The invention belongs to the technical field of energy storage batteries, and particularly relates to an energy storage battery module, an energy storage battery cluster and an energy storage battery system.
Background
Energy storage technology is a technology that stores energy by physical or chemical means for utilization when needed. The storage media are classified into mechanical type, electromagnetic type, electrochemical type, heat storage type, chemical type, and the like. The electrochemical energy storage is flexible and efficient, the total investment cost is low, the service life is long, and the development is rapid in recent years.
The energy storage battery module is an important electrochemical energy storage module, mainly composed of a plurality of battery monomers connected in series and/or in parallel, and only having a pair of positive and negative output terminals, also called a battery pack. The energy storage battery modules are connected in series and/or parallel and are connected with the converter and the accessory facilities to form a battery assembly capable of realizing independent operation, and the battery assembly is called a battery cluster. A plurality of battery clusters are integrated in a container to form an energy storage battery system.
In actual operation, the energy storage battery system has safety accidents, such as: the temperature cannot be controlled to rise due to the internal exothermic reaction of the battery monomer, so that thermal runaway is caused, if the temperature cannot be controlled to rise in time, thermal runaway diffusion is caused, and the normal operation and safety of an energy storage battery system are seriously influenced; the overcurrent or overvoltage in the battery loop causes the loop breakdown to cause safety problems such as fire, explosion and the like; the safety problems of battery system paralysis, fire and the like are caused by power loss, short circuit, disconnection and the like of a power supply in a battery loop. Especially for a lithium battery system which develops rapidly in recent years, compared with a traditional lead-acid battery, a lead-carbon battery and the like, the lithium battery has higher energy density and more active property, but has lower thermal stability, and has continuous safety accidents, especially fire accidents, arouse much attention, and has a negative effect on the development of the lithium battery energy storage industry.
For this purpose, the energy storage battery system also comprises components such as a battery management system, a detection and protection circuit, an electrical and communication interface and the like. The battery management system is used for detecting parameter information of the battery system, such as voltage, current, temperature and the like, and managing and controlling the state of the battery system.
For example, for an energy storage battery system formed by connecting a plurality of battery cells in series and/or in parallel to form a battery module, connecting a plurality of battery modules in series to form a battery cluster, and connecting a plurality of battery clusters in parallel, a schematic diagram of a conventional circuit structure is shown in fig. 1. Each battery cluster forms an independent main loop, and a circuit breaker, a contactor and a fuse are arranged in the main loop. In each main loop, the main safety protection is a three-level framework, and the main safety protection is as follows from bottom to top: a slave control module (BMU), a master control module (BPU) and a master control module (BMS).
The BMU is used to detect and manage the battery cells in a single battery module. Each BMU transmits the test results to the BPU, which may control a circuit breaker, contactor, or fuse in the main loop: for example, when the BMU detects that a certain battery cell or cells in the battery module are out of control due to heat, the BMU transmits the detection result to the BPU, and the BPU opens a circuit breaker or a contactor of a main circuit of the battery cluster, so as to cut off the main circuit; when the BMU detects short circuit or overcurrent of one or more battery monomers in the battery module, the detection result is transmitted to the BPU, and the BPU fuses a fuse in a main loop of the battery cluster, so that the main loop is cut off; the electrical safety of the main loop is ensured by cutting off the main loop, and meanwhile, the battery module which generates thermal runaway or fires is put out of fire by matching with other fire fighting means such as aerosol, heptafluoropropane, perfluorohexanone, water and the like.
Meanwhile, the BPUs transmit the electrical state of the main circuit to the BMS, and the BMS may manage, control, and command the BPUs. For example, when a battery cell or a battery module in a certain battery cluster has a risk of R thermal runaway, the BMS may instruct the BPU in the battery cluster to open a circuit breaker or a contactor of a main circuit of the battery cluster, so as to break the main circuit and ensure electrical safety of the main circuit; when a single battery or a battery module in a certain battery cluster has a short circuit risk or an overcurrent risk, the BMS can instruct a BPU in the battery cluster to automatically fuse a fuse in a main loop of the battery cluster, so that the main loop is cut off, and the electrical safety of the main loop is ensured.
However, the battery management system has the following problems:
(1) aiming at the electrical fault in the battery module, the BMU can only detect the fault, but cannot take measures for the fault in the range of the battery module, the BMU can only transmit the detection result to the BPU, and the BPU controls a breaker, a contactor or a fuse arranged on a main loop to cut off the main loop, so that the electrical safety of the main loop is ensured.
(2) The problems with breaking the main circuit through a circuit breaker, contactor or fuse are: the voltage level of the battery cluster is higher than that of the battery cell and the battery module. For example, the voltage of a single lithium battery is in the range of DC 2V-4V, the voltage of a single battery module formed by connecting a plurality of lithium battery cells in series and parallel through copper bars and adding a battery management system is below DC100V, and the voltage of a single battery cluster formed by connecting a plurality of battery modules in series through cables is in the range of DC 500V-1000V. Therefore, when a battery cell or a battery module fails, an electrical fault which cannot be responded due to the adhesion of a contactor with higher voltage or the like exists when the main circuit is cut off by a circuit breaker, a contactor or a fuse; in addition, since the voltage level of the battery pack is high, a new risk, for example, a short circuit, an electric shock, or other extended loss is likely to occur when a subsequent fire extinguishing means (water, heptafluoropropane) intervenes.
Disclosure of Invention
In view of the above technical situation, the present invention provides an energy storage battery module, which can improve the response to a fault and the control protection capability, and improve the safety.
The technical scheme provided by the invention is as follows: an energy storage battery module, as shown in fig. 2, includes a plurality of battery cells 10, the battery cells are connected together in series and/or parallel to form a positive terminal and a negative terminal, and the energy storage battery module is characterized in that:
further comprising a slave control module (BMU);
the positive end is connected with a contactor 20 in series, the contactor comprises a contact 21 and a coil 22, and the contactor 20 is normally open;
and the slave control module drives the coil to be electrified or not.
The operating principle of the contactor 20 is as follows: when the coil 22 of the contactor is electrified, the coil current generates a magnetic field, so that the contact 21 acts, the normally closed contact is opened, and the normally open contact is closed. When the coil 22 is de-energized, the electromagnet disappears, causing the contact 21 to recover, the normally open contact to open, and the normally closed contact to close. When the normally open contact is closed, the battery module outputs voltage to the outside, and when the normally open contact is opened, the battery module does not output voltage to the outside.
As an implementation manner, the contactor 20 further includes a static iron core and a moving iron core, the contact is connected to the moving iron core, when the coil of the contactor is powered on, the coil current generates a magnetic field, the generated magnetic field causes the static iron core to generate an electromagnetic attraction force to attract the moving iron core, and drives the contact of the contactor to act, the normally closed contact is opened, and the normally open contact is closed. When the coil is powered off, the electromagnetic attraction disappears, so that the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed.
The slave control module controls whether the coil is electrified or not, namely the slave control module can control the coil of the contactor to be electrified or not. When the slave control module controls the coil of the contactor to be electrified, the coil current generates a magnetic field, the contact is closed, the anode outputs electricity, and the battery module can output electricity to the outside; when the slave control module controls the coil of the contactor to lose power, the contact of the contactor is disconnected, the anode has no output, and the battery module has no output to the outside.
Preferably, the voltage of the battery cell is DC2V to 4V.
Preferably, the voltage of the battery module is DC100V or less.
Preferably, the voltage of the battery pack is DC500 to DC 1000V.
Preferably, the voltage of the coil is DC 12V-24V.
Preferably, the slave control module BMU can also be used for collecting the internal voltage and temperature of the battery pack.
The invention also provides an energy storage battery cluster which comprises a plurality of energy storage battery modules, a master control module (BMS) and a contactor, wherein the energy storage battery modules are connected in series and/or in parallel, and the master control module controls whether the BMU in each energy storage battery module drives the coil of the contactor in the energy storage battery module to be electrified or not.
That is, the BMUs in each energy storage battery module are controlled by the BMS. And only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, the positive electrode outputs electricity, and the battery module can output the electricity to the outside. When the BMS detects the thermal runaway of a certain energy storage battery module, namely, the temperature of a certain point rises rapidly in a short time, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in the energy storage battery module, the contactor is kept normally open, and the thermal runaway of the energy storage battery module is prevented from influencing the safety of a battery cluster. When the BMS fails or the working power supply loses power, the battery is in an unmanaged state, all loops are kept disconnected due to the fact that the contactor is normally open, and the fact that the battery module stops working in the unmanaged state is guaranteed.
In addition, in the case where the energy storage battery modules are connected in series to form a main circuit of the battery cluster, when the fault detected by the BMS is in the main circuit of the battery cluster, not inside the energy storage battery modules, the BMS may be adapted to not output a signal to energize a coil of a driving contactor to a BMU in one or more of the energy storage battery modules, and the contactor may be kept normally open, thereby disconnecting the main circuit of the battery cluster. Compared with the method of cutting off the main circuit by opening a circuit breaker, a contactor or a fuse in the main circuit of the battery cluster, the method avoids the problems of electrical faults which cannot be responded due to the adhesion of the contactor and the like and short circuit, electric shock and the like caused by subsequent fire protection because the voltage of the battery module is lower.
The invention also provides an energy storage battery system, which comprises a plurality of battery clusters and a master control module (BMS);
the battery clusters are connected together in series and/or in parallel; each battery cluster comprises a plurality of energy storage battery modules, and the energy storage battery modules are connected together in series and/or in parallel;
and the master control module controls the BMU in each energy storage battery module to drive the coil of the contactor in the energy storage battery module to be electrified or not.
That is, the BMUs in each energy storage battery module are controlled by the BMS. And only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, the positive electrode outputs electricity, and the battery module can output the electricity to the outside. When the BMS detects the thermal runaway of a certain energy storage battery module, namely, the temperature of a certain point rises rapidly in a short time, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in the energy storage battery module, the contactor is kept normally open, and the thermal runaway of the energy storage battery module is prevented from influencing the safety of a battery cluster. When the BMS fails or the working power supply loses power, the battery is in an unmanaged state, all loops are kept disconnected due to the fact that the contactor is normally open, and the fact that the battery module stops working in the unmanaged state is guaranteed.
In addition, when the energy storage battery modules are connected in series to form a main circuit of the battery cluster in a certain battery cluster, when the fault detected by the BMS is in the main circuit of the battery cluster but not inside the energy storage battery modules, the BMS may also be adopted to not output a signal for driving the coil of the contactor to be electrified to the BMU in a certain or several energy storage battery modules, and the contactor is kept normally open, so that the main circuit of the battery cluster is disconnected. Compared with the method of cutting off the main circuit of the battery cluster by opening a circuit breaker, a contactor or a fuse in the main circuit of the battery cluster, the method avoids the problems of electrical faults which cannot be responded due to the adhesion of the contactor and the like and short circuit, electric shock and the like caused by subsequent fire fighting due to the lower voltage of the battery module.
Compared with the prior art, the invention has the advantages that the contactor is connected in series in the energy storage battery module, the contactor is set to be normally open, and the slave control module drives the coil of the contactor to be electrified or not, and the invention has the following beneficial effects:
(1) whether the external output voltage is controlled within the range of the energy storage battery module is realized, the voltage can be output only when the battery module works normally and has no fault, and when the faults such as battery thermal runaway, loop overcurrent or overvoltage and the like occur, the loop is cut off, and no voltage is output;
(2) when the energy storage battery modules form a battery cluster or a battery system, the electrical connection between the battery modules in the battery cluster can be disconnected, and the disconnection of the battery modules is realized. When battery monomer or whole battery module broke down, the contactor disconnection back, battery module does not have voltage to the outside, and internal voltage is lower, overhauls fortune dimension personnel's operation risk greatly reduced, has improved the security. No new risks and losses are created if further fire fighting treatments are performed at this point. Meanwhile, as the battery modules are mutually independent, the battery modules which are out of control of heat can be subjected to fire fighting and cooling, and the fire fighting efficiency and the success rate are improved.
In addition, when the battery modules are connected in series to form the battery cluster, even if the contactors of the main loop are adhered, the main loop can still be disconnected as long as any battery module is disconnected from the battery cluster in the series system of the battery cluster, so that the response and control protection capability on faults is improved, and the safety is improved.
(3) The closing logic of the contactor is integrated in the battery management system, so that automatic control can be realized, and meanwhile, the contactor can interact with the control logic of a fire safety system and an upper computer system without human intervention;
(4) because the electrical characteristics of the contactor and the response and action time are in millisecond level, the battery module has quick response and action;
(5) the mechanical life of the contactor is long and can reach 1 multiplied by 105And therefore, the battery module of the present invention has a long service life.
Drawings
Fig. 1 is a schematic diagram of a topology of a conventional energy storage battery system.
Fig. 2 is a schematic structural diagram of an energy storage battery module according to the present invention.
Fig. 3 is a schematic view of a topology of an energy storage battery module in embodiment 1 of the present invention.
The reference numerals in fig. 2 are: battery cell 10, contactor 20, contact 21, coil 22.
The reference numerals in fig. 3 are: contactor 1, contact 2, coil 3.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, which are not intended to limit the invention to the details shown.
Example 1:
in this embodiment, as shown in fig. 3, the energy storage battery module includes 48 battery cells, each 2 battery cells are connected in parallel to form a unit, and then connected in series with other parallel units to form a 24-string 2-parallel battery module, which has a positive terminal and a negative terminal. The positive terminal is connected with a contactor 1 in series, the contactor 1 comprises a contact 2 and a coil 3, and the contactor 1 is normally opened.
In this embodiment, the contactor 1 further includes a static iron core and a moving iron core, the contact is connected to the moving iron core, when the coil is energized, the coil current generates a magnetic field, the generated magnetic field causes the static iron core to generate an electromagnetic attraction force to attract the moving iron core and drive the contact of the contactor to act, the normally closed contact is opened, and the normally open contact is closed. When the coil is powered off, the electromagnetic attraction disappears, so that the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed.
In this example, the parameters of contactor 1 are shown in the following table:
the energy storage battery module further comprises a slave control module BMU, wherein the BMU can collect the internal voltage and temperature of the battery module, as shown in FIG. 3, every 2 parallel-connected battery cores are used as a voltage collecting point, 24 voltage collecting points are provided in total, every two series-connected units are used as a temperature collecting point, and 12 temperature collecting points are provided in total.
The BMU is also used to drive the contactor coil on or off. When a coil of the BMU drive contactor is electrified, the coil current generates a magnetic field, the contact is closed, the anode outputs electricity, and the battery module can output electricity to the outside; when the coil of the BMU driving contactor loses power, the contact of the contactor is disconnected, the anode has no output, and the battery module has no output to the outside.
In this embodiment, the voltage of the battery cell is DC2.5V-3.65V. The voltage of the battery module is DC 60-87.6V.
Example 2:
in this embodiment, the energy storage battery cluster includes 8 energy storage battery modules in embodiment 1, and the energy storage battery modules are connected in series, and further includes a total control module (BMS), and the BMS controls whether the BMU in each energy storage battery module drives the coil of the contactor in the energy storage battery module to be powered on or not.
That is, the BMUs in each energy storage battery module are controlled by the BMS:
(1) and only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, the positive electrode outputs electricity, and the battery module can output the electricity to the outside.
(2) When the BMS detects the thermal runaway of a certain energy storage battery module, namely, the temperature of a certain point rises rapidly in a short time, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in the energy storage battery module, the contactor is kept normally open, and the thermal runaway of the energy storage battery module is prevented from influencing the safety of a battery cluster.
(3) When the BMS fails or the working power supply loses power, the battery is in an unmanaged state, and all loops are kept disconnected because the contactor is normally open, so that the battery module is ensured to stop working in the unmanaged state.
In addition, because the energy storage battery modules are connected in series to form a main battery cluster circuit, when the fault detected by the BMS is in the main battery cluster circuit but not in the energy storage battery modules, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in one or more energy storage battery modules, and the contactor is kept normally open, so that the main battery cluster circuit is disconnected. Compared with the method of cutting off the main circuit by opening a circuit breaker, a contactor or a fuse in the main circuit of the battery cluster, the method avoids the problems of electrical faults which cannot be responded due to the adhesion of the contactor and the like and short circuit, electric shock and the like caused by subsequent fire protection because the voltage of the battery module is lower.
Example 3:
in this embodiment, the energy storage battery system includes 8 battery clusters and a total control module (BMS) in embodiment 2; the battery clusters are connected together in parallel.
And the BMS controls the BMU in each energy storage battery module to drive the coil of the contactor in the energy storage battery module to be electrified or not.
That is, the BMUs in each energy storage battery module are controlled by the BMS:
(1) and only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, the positive electrode outputs electricity, and the battery module can output the electricity to the outside.
(2) When the BMS detects the thermal runaway of a certain energy storage battery module, namely, the temperature of a certain point rises rapidly in a short time, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in the energy storage battery module, the contactor is kept normally open, and the thermal runaway of the energy storage battery module is prevented from influencing the safety of a battery cluster.
(3) When the BMS fails or the working power supply loses power, the battery is in an unmanaged state, and all loops are kept disconnected because the contactor is normally open, so that the battery module is ensured to stop working in the unmanaged state.
In addition, because the energy storage battery modules are connected in series to form a battery cluster main loop, when the fault detected by the BMS is in a certain battery cluster main loop but not inside the energy storage battery modules in the battery cluster, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU in one or more energy storage battery modules in the battery cluster, and the contactor is kept normally open, so that the battery cluster main loop is disconnected. Compared with the method of cutting off the main circuit of the battery cluster by opening a circuit breaker, a contactor or a fuse in the main circuit of the battery cluster, the method avoids the problems of electrical faults which cannot be responded due to the adhesion of the contactor and the like and short circuit, electric shock and the like caused by subsequent fire fighting due to the lower voltage of the battery module.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An energy storage battery module comprises a plurality of battery monomers, wherein the battery monomers are connected in series and/or in parallel to form a positive terminal and a negative terminal, and the energy storage battery module is characterized in that:
the system also comprises a slave control module, wherein the slave control module is abbreviated as a BMU;
the positive end is connected with a contactor in series, and the contactor comprises a contact and a coil;
the contactor is normally open;
the BMU drives the coil to be electrified or not.
2. An energy storage battery module as claimed in claim 1, wherein: the voltage of the battery monomer is DC 2V-DC 4V;
preferably, the voltage of the battery module is DC100V or less.
3. An energy storage battery module as claimed in claim 1, wherein: the voltage of the coil is DC 12V-DC 24V.
4. An energy storage battery cluster is characterized in that: the energy storage battery module comprises a plurality of energy storage battery modules of any one of claims 1 to 3, wherein the energy storage battery modules are connected together in series and/or in parallel;
the system also comprises a master control module, wherein the master control module is abbreviated as BMS; and the BMS controls the BMU in each energy storage battery module to drive the coil of the contactor in the energy storage battery module to be electrified or not.
5. The energy storage battery cluster of claim 4, wherein: the voltage of the energy storage battery cluster is DC 500-DC 1000V.
6. The energy storage battery cluster of claim 4, wherein: and only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, and the energy storage battery module outputs voltage to the outside.
7. The energy storage battery cluster of claim 4, wherein: under the condition that the energy storage battery modules are connected in series to form a battery cluster main loop, when the fault detected by the BMS occurs in the battery cluster main loop, the BMS does not output a signal for driving a coil of a contactor to be electrified to a BMU (BMU) in one or more energy storage battery modules, and the contactor is kept normally open to disconnect the battery cluster main loop.
8. An energy storage battery system, characterized by: the system comprises a plurality of battery clusters and a master control module;
the battery clusters are connected together in series and/or in parallel;
each battery cluster comprises a plurality of energy storage battery modules of any one of claims 1 to 3, which are connected together in series and/or in parallel;
and the master control module controls the BMU in each energy storage battery module to drive the coil of the contactor in the energy storage battery module to be electrified or not.
9. The energy storage battery system of claim 8, wherein: and only when the energy storage battery module works normally and has no fault, the BMS outputs a signal for driving a coil of the contactor to be electrified to a BMU in the energy storage battery module, the BMU drives the coil of the contactor in the energy storage battery module to be electrified, the contact is closed, and the energy storage battery module outputs voltage to the outside.
10. The energy storage battery system of claim 8, wherein: when the faults detected by the BMS occur in the main circuit of the battery cluster, the BMS does not output signals for driving coils of a contactor to be electrified to BMUs in one or more energy storage battery modules, and the contactor is kept normally open to disconnect the main circuit of the battery cluster.
Priority Applications (1)
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