CN110854965B - Multi-path parallel lithium battery system and control method thereof - Google Patents
Multi-path parallel lithium battery system and control method thereof Download PDFInfo
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- CN110854965B CN110854965B CN201911256251.5A CN201911256251A CN110854965B CN 110854965 B CN110854965 B CN 110854965B CN 201911256251 A CN201911256251 A CN 201911256251A CN 110854965 B CN110854965 B CN 110854965B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 47
- 230000003068 static effect Effects 0.000 claims description 44
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a multi-path parallel lithium battery system and a control method thereof, which can keep the voltage consistency among multiple paths, solve the problems of circulation or heavy current impact and the like, and prolong the service life of a battery; the battery pack comprises a BMS and a plurality of branch modules, wherein the branch modules are connected in parallel, each branch module comprises a lithium battery module formed by connecting single battery cells in series, and the battery pack also comprises an equalization module, a charging module and a discharging module which are connected in parallel and are respectively connected with the BMS; the total positive end of the parallel connection of the plurality of branch modules is connected with one end of a node of the parallel connection of the BMS, the balancing module, the discharging module and the charging module, and the total negative end of the parallel connection of the plurality of branch modules is connected with the other end of the parallel connection of the BMS, the balancing module, the discharging module and the charging module; the branch circuit module further comprises a fuse, a branch circuit current sensor and a branch circuit relay, wherein the fuse, the lithium battery module, the branch circuit current sensor and the branch circuit relay are sequentially connected in series, and the branch circuit current sensor and the branch circuit relay are connected with the BMS.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a multi-path parallel lithium battery system and a control method thereof.
Background
With the development of science and technology, lithium batteries have become the mainstream nowadays, and a lithium battery pack as an energy storage device generally includes a single cell or a module, an electronic component, a battery box, and an interface with other external systems; in practical applications, the entire lithium battery pack is typically composed of several lithium battery modules, which are the smallest grouping of battery packs or systems that are physically and electrically connected together of the individual battery cells, and can be replaced as a unit.
With the increase of the power consumption demand, the capacity of the single battery is increased and limited, so that a plurality of single batteries are often required to be connected in parallel to meet the capacity demand, at present, a traditional battery grouping mode is often adopted, namely a mode of firstly connecting a plurality of single batteries in parallel and then connecting the single batteries in series, namely a mode of firstly connecting the single batteries in parallel and then connecting the single batteries in series, and in this way, although the control difficulty and the cost of a battery management system can be effectively controlled, the control difficulty and the cost of the battery management system have a fatal defect that each single battery cannot be monitored. A better way is to run first and then to merge. However, the consistency of lithium batteries is difficult to be well ensured, and the internal resistance and the self-consumption of the whole group are slightly different after the group is formed, so that the problems of non-uniform voltage, circulation or large current impact and the like can occur among multiple batteries which are connected in parallel in the use process, thereby causing failure condition, even malignant accidents, and greatly reducing the service life of the batteries.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-path parallel lithium battery system and a control method thereof, which can keep the voltage among multiple paths consistent, solve the problems of circulation or large current impact and the like, and prolong the service life of the battery.
The technical scheme is as follows: the utility model provides a parallelly connected lithium battery system of usefulness of multichannel, its includes BMS and a plurality of tributary module, parallel connection between the tributary module, every the tributary module all includes the lithium battery module that forms by the series connection of monomer electric core, its characterized in that: the system also comprises an equalization module for equalizing the system pressure difference;
The charging module is used for charging the system;
the discharging module is used for performing discharging operation on the system;
the equalization module, the discharging module and the charging module are connected in parallel and are respectively connected with the BMS; the total positive end of the parallel connection of the plurality of the branch modules is connected with one end of a node of the BMS, the balancing module, the discharging module and the charging module, and the total negative end of the parallel connection of the plurality of the branch modules is connected with the other end of the parallel connection of the BMS, the balancing module, the discharging module and the charging module;
the branch circuit module further comprises a fuse, a branch circuit current sensor and a branch circuit relay, wherein the fuse, the lithium battery module, the branch circuit current sensor and the branch circuit relay are sequentially connected in series, and the branch circuit current sensor and the branch circuit relay are connected with the BMS.
It is further characterized by:
The balancing module comprises balancing relays and balancing loads which are connected in series, wherein the balancing relays and the balancing loads are connected with the BMS, the balancing relays are connected with the total positive end, and the balancing loads are connected with the total negative end;
The charging module comprises a charging relay and charging equipment which are connected in series, wherein the charging relay and the charging equipment are both connected with the BMS, the charging relay is connected with the total positive end, and the charging equipment is connected with the total negative end;
the discharging module comprises a discharging relay and load equipment which are connected in series, wherein the discharging relay and the load equipment are connected with the BMS, the discharging relay is connected with the total positive end, and the load equipment is connected with the total negative end.
A control method of a multi-path parallel lithium battery system is characterized in that: which comprises the following steps:
s1, BMS power-on self-test, and then respectively collecting the static total voltage of each branch;
S2, if the static total voltage difference of each branch is within a set balance threshold, the multi-path parallel lithium battery system enters a normal mode, at the moment, the branch relays on each branch module are closed, and then the corresponding charging relay or the discharging relay is respectively attracted according to the discharging or charging requirement to perform normal discharging or charging operation;
If the differential pressure between the static total voltages of the branches of each branch exceeds the balance threshold value but is smaller than the safety threshold value, the multi-path parallel lithium battery system enters an equalization process, and the equalization process respectively runs a preheating mode or an equalizing charge mode according to whether the multi-path parallel lithium battery system is currently a discharging process or a charging process:
S2.1, in a preheating mode, controlling a branch relay of a branch with the highest branch static total voltage to be closed by the BMS according to the static total voltage of each branch acquired in the step S1, and then closing an equalizing relay, equalizing load operation until the pressure difference between the static total voltages of all branches is within an equalizing threshold, wherein the multi-path parallel lithium battery system enters a normal mode and starts normal discharge;
S2.2, in an equalizing charge mode, the BMS controls the charging equipment to carry out power reduction treatment, then, according to the static total voltage of each branch acquired in the step S1, the branch relays of other branches except the highest branch total voltage are closed, and then, the charging relay is closed so as to charge the multi-path parallel lithium battery system until the pressure difference between the static total voltages of all the branches is within an equalizing threshold value, and the multi-path parallel lithium battery system enters a normal mode and starts full-power charging;
If the voltage difference between the static total voltages of the branches of each branch exceeds a set safety threshold, the multi-path parallel lithium battery system enters a standby mode, and in the standby mode, the multi-path parallel lithium battery system performs open circuit shielding on the branch with faults and performs power reduction operation while giving an alarm.
It is further characterized by:
In the step S2.1, in the preheating mode, according to the static total voltage of each branch acquired in the step S1, the BMS controls the branch relay of the branch with the highest static total voltage to be closed, and then closes the balancing relay, so that the balancing load works, the BMS acquires the dynamic total voltage of the branch in real time, after a certain threshold is reached, the balancing load stops working, and opens the balancing relay, at this time, whether the pressure difference between the static total voltages of each branch is within the balancing threshold is again confirmed, mode judgment is performed, if the pressure difference is within the balancing threshold, normal discharge is started, and if the pressure difference is not within the balancing threshold, the operation in the step S2.1 is repeated;
In the step S2.2, in the equalizing charge mode, the BMS controls the charging device to perform power reduction, then closes the branch relays of the branches except for the highest branch total voltage according to the static total voltage of each branch collected in the step S1, and then closes the charging relay to charge the multi-path parallel lithium battery system, after the total voltage of the multi-path parallel lithium battery system reaches a certain threshold, the charging device stops charging, and opens the charging relay, at this time, again confirms whether the differential pressure between the static total voltages of each branch is within the equalizing threshold, performs mode judgment, if so, starts full-power charging, and if not, repeats the operation in the step S2.2;
If the pressure difference between the static total voltages of the branches of each branch exceeds a set safety threshold, at the moment, if the static total voltages of the branches are in a charging state, entering an equalizing charge mode, and judging the mode after finishing the equalizing charge mode; if the multi-path parallel lithium battery system enters a standby mode in a discharging state, the multi-path parallel lithium battery system performs open-circuit shielding on a branch circuit with a fault in the standby mode, operates in a power-down mode and gives an alarm; at this time, the BMS collects the dynamic total voltage of the branch with the fault in real time, when the dynamic total voltage reaches an equilibrium threshold value, alarms and reminds and inquires whether a user tries to recover the normal mode, if the user selects to recover, the user is reminded to restart the system in a safe state, and then mode judgment is carried out again; if the user does not care, no operation is performed;
If the operation is performed in the equalizing charge mode for n times or the recovery operation time from the standby mode to the normal mode exceeds n times, n is more than or equal to 2, the multi-path parallel lithium battery system still cannot enter the normal mode, namely, a fault occurs in a certain branch, the multi-path parallel lithium battery system enters the standby mode, and in the standby mode, the multi-path parallel lithium battery system performs open circuit shielding on the branch with the fault, and performs power reduction operation while sending an alarm;
Under any mode, the current value of each branch current sensor is collected in real time and transmitted to the BMS, and if the current is abnormal, the BMS gives an alarm, and the corresponding branch is cut off or the whole multi-path lithium battery system for parallel connection is adopted.
The invention has the beneficial effects that the whole multi-path parallel lithium battery system is formed by connecting a plurality of branch modules in parallel, and is connected with the equalization module, the discharge module and the charging module in parallel, so after the BMS collects the static total voltage of each path, the mode judgment is carried out, and the equalization or the discharge or the charging mode operation can be carried out according to the corresponding conditions, thereby the consistency of the voltages among the branches can be maintained, the problems of circulation or heavy current impact and the like are effectively solved, the failure condition is prevented, and the service life of the battery is prolonged.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
Fig. 2 is a schematic flow chart of the present invention.
Detailed Description
As shown in fig. 1, the multi-path parallel lithium battery system of the present invention includes a BMS and 2 branch modules, in which the embodiment adopts 2 branches connected in parallel as an example, in practical application, the multi-path parallel lithium battery system is not limited to two paths, and the 2 branch modules are connected in parallel, each branch module includes a lithium battery module formed by connecting single cells in series, and further includes an equalization module for equalizing a system pressure difference;
The charging module is used for charging the system;
the discharging module is used for performing discharging operation on the system;
The equalization module, the discharging module and the charging module are connected in parallel and are respectively connected with the BMS; the total positive end of the 2 branch modules after being connected in parallel is connected with one end of a node of the BMS, the balancing module, the discharging module and the charging module after being connected in parallel, so that the total voltage of the BMS real-time acquisition system is realized; the total negative terminal is connected with the BMS and the other end of the node after the balancing module, the discharging module and the charging module are connected in parallel, so that the BMS can detect the total negative voltage;
the branch circuit module further comprises a fuse, a branch circuit current sensor and a branch circuit relay, wherein the fuse, the lithium battery module, the branch circuit current sensor and the branch circuit relay are sequentially connected in series, and the branch circuit current sensor and the branch circuit relay are connected with the BMS.
The branch current sensor is responsible for collecting the branch current of each branch in real time and reporting the branch current to the BMS; the BMS can directly collect the static total voltage and the system total voltage of each branch; the on and off of the branch relay is controlled by the BMS, so that the connection on and off of the branch is realized.
The balancing module comprises balancing relays and balancing loads which are connected in series, wherein the balancing relays and the balancing loads are connected with the BMS, the balancing relays are connected with the total positive end, and the balancing loads are connected with the total negative end, so that a discharging balancing loop is formed.
The charging module comprises a charging relay and charging equipment which are connected in series, wherein the charging relay and the charging equipment are connected with the BMS, the charging relay is connected with a main positive end, and the charging equipment is connected with a main negative end, so that a charging loop is formed.
The discharging module comprises a discharging relay and a load device which are connected in series, wherein the discharging relay and the load device are connected with the BMS, the discharging relay is connected with the total positive end, and the load device is connected with the total negative end, so that a discharging loop is formed.
As shown in fig. 2, a control method of a multi-path parallel lithium battery system includes the following steps:
S1, BMS power-on self-test, and then respectively collecting the static total voltage of each branch to judge the mode;
s2, when judging the mode, if the static total voltage difference of each branch is within a set balance threshold, if the static total voltage difference is smaller than 1V, the multi-path parallel lithium battery system enters a normal mode, at the moment, the branch relays on each branch module are closed, and then the corresponding charging relay or the discharging relay is respectively attracted according to the discharging or charging requirement to perform normal discharging or charging operation;
When the mode judgment is carried out, if the static total voltage difference of the branches of each branch exceeds the balance threshold, but is smaller than the safety threshold, such as larger than 1V and smaller than 5V, the multi-path parallel lithium battery system enters an equalization process, and the equalization process respectively runs a preheating mode or an equalization charging mode according to whether the multi-path parallel lithium battery system is currently in a discharging process or a charging process:
S2.1, in a preheating mode, according to the static total voltage of each branch acquired in the step S1, the BMS controls a branch relay of a branch with the highest static total voltage to be closed, then the balancing relay is closed, the balancing load works, the BMS acquires the dynamic total voltage of the branch in real time, after a certain threshold value is reached, the balancing load stops working, and the balancing relay is disconnected, at the moment, whether the pressure difference between the static total voltages of each branch is in the balancing threshold value is confirmed again, mode judgment is carried out, normal discharge is started if the pressure difference is in the balancing threshold value, and if the pressure difference is not in the balancing threshold value, the operation in the step S2.1 is repeated;
S2.2, in the equalizing charge mode, the BMS controls the charging equipment to carry out power reduction treatment, and in the embodiment, 2 paths of branches are connected in parallel, so that half of power is reduced; if 3 paths of branches are connected in parallel, one third of the power is reduced, and the like;
Then according to the static total voltage of each branch acquired in the step S1, closing the branch relays of other branches except the highest branch total voltage, closing the charging relay again to charge the multi-path parallel lithium battery system, stopping charging after the total voltage of the multi-path parallel lithium battery system reaches a certain threshold, disconnecting the charging relay, at the moment, again confirming whether the pressure difference between the static total voltages of each branch is within an equilibrium threshold, judging the mode, if the pressure difference is within the equilibrium threshold, starting full-power charging, and if the pressure difference is not within the equilibrium threshold, repeating the operation in the step S2.2;
When the mode judgment is carried out, if the pressure difference between the static total voltages of the branches of each branch exceeds a set safety threshold value, if the pressure difference is larger than 5V, at the moment, if the pressure difference is in a charging state, a balanced charging mode is entered, and the mode judgment is carried out after the balanced charging mode is ended; if the multi-path parallel lithium battery system enters a standby mode in a discharging state, the multi-path parallel lithium battery system performs open circuit shielding on a branch circuit with faults in the standby mode, performs power reduction operation and gives an alarm. Although the power of the multi-path parallel lithium battery system is reduced at this time, the whole system can still operate. At this time, the BMS collects the dynamic total voltage of the branch with the fault in real time, and reminds and inquires whether the user tries to restore the normal mode when the balance threshold is reached, and if the user selects to restore, reminds the user to restart the system in a safe state, and then resumes mode judgment. If the user does not care, then there is no action.
If the operation is performed for 2 times in the equalizing charge mode or the recovery operation time from the standby mode to the normal mode exceeds 2 times, the multi-path parallel lithium battery system still cannot enter the normal mode, namely, a certain branch is indicated to have a fault, the multi-path parallel lithium battery system enters the standby mode, and in the standby mode, the multi-path parallel lithium battery system performs open circuit shielding on the branch with the fault and performs power reduction operation while giving an alarm;
Under any mode, the current value of each branch current sensor is collected in real time and transmitted to the BMS, and if the current is abnormal, the BMS gives an alarm, and the corresponding branch is cut off or the whole multi-path lithium battery system for parallel connection is used.
Claims (2)
1. A control method of a multi-path parallel lithium battery system is characterized in that: the adopted multi-path parallel lithium battery system comprises a BMS and a plurality of branch modules, wherein the branch modules are connected in parallel, each branch module comprises a lithium battery module formed by connecting single battery cells in series, and the lithium battery system further comprises an equalization module for equalizing the pressure difference of the system;
The charging module is used for charging the system;
the discharging module is used for performing discharging operation on the system;
the equalization module, the discharging module and the charging module are connected in parallel and are respectively connected with the BMS; the total positive end of the parallel connection of the plurality of the branch modules is connected with one end of a node of the BMS, the balancing module, the discharging module and the charging module, and the total negative end of the parallel connection of the plurality of the branch modules is connected with the other end of the parallel connection of the BMS, the balancing module, the discharging module and the charging module;
The branch circuit module further comprises a fuse, a branch circuit current sensor and a branch circuit relay, wherein the fuse, the lithium battery module, the branch circuit current sensor and the branch circuit relay are sequentially connected in series, and the branch circuit current sensor and the branch circuit relay are connected with the BMS;
The balancing module comprises balancing relays and balancing loads which are connected in series, wherein the balancing relays and the balancing loads are connected with the BMS, the balancing relays are connected with the total positive end, and the balancing loads are connected with the total negative end;
The charging module comprises a charging relay and charging equipment which are connected in series, wherein the charging relay and the charging equipment are both connected with the BMS, the charging relay is connected with the total positive end, and the charging equipment is connected with the total negative end;
The discharging module comprises a discharging relay and load equipment which are connected in series, wherein the discharging relay and the load equipment are connected with the BMS, the discharging relay is connected with the total positive end, and the load equipment is connected with the total negative end;
The control method comprises the following steps:
s1, BMS power-on self-test, and then respectively collecting the static total voltage of each branch;
S2, if the static total voltage difference of each branch is within a set balance threshold, the multi-path parallel lithium battery system enters a normal mode, at the moment, the branch relays on each branch module are closed, and then the corresponding charging relay or the discharging relay is respectively attracted according to the discharging or charging requirement to perform normal discharging or charging operation;
If the differential pressure between the static total voltages of the branches of each branch exceeds the balance threshold value but is smaller than the safety threshold value, the multi-path parallel lithium battery system enters an equalization process, and the equalization process respectively runs a preheating mode or an equalizing charge mode according to whether the multi-path parallel lithium battery system is currently a discharging process or a charging process:
S2.1, in a preheating mode, controlling a branch relay of a branch with the highest branch static total voltage to be closed by the BMS according to the static total voltage of each branch acquired in the step S1, and then closing an equalizing relay, equalizing load operation until the pressure difference between the static total voltages of all branches is within an equalizing threshold, wherein the multi-path parallel lithium battery system enters a normal mode and starts normal discharge;
S2.2, in an equalizing charge mode, the BMS controls the charging equipment to carry out power reduction treatment, then, according to the static total voltage of each branch acquired in the step S1, the branch relays of other branches except the highest branch total voltage are closed, and then, the charging relay is closed so as to charge the multi-path parallel lithium battery system until the pressure difference between the static total voltages of all the branches is within an equalizing threshold value, and the multi-path parallel lithium battery system enters a normal mode and starts full-power charging;
If the voltage difference between the static total voltages of the branches of each branch exceeds a set safety threshold, the multi-path parallel lithium battery system enters a standby mode, and in the standby mode, the multi-path parallel lithium battery system performs circuit breaking shielding on the branch with faults and performs power reduction operation while giving an alarm;
In the step S2.1, in the preheating mode, according to the static total voltage of each branch acquired in the step S1, the BMS controls the branch relay of the branch with the highest static total voltage to be closed, and then closes the balancing relay, so that the balancing load works, the BMS acquires the dynamic total voltage of the branch in real time, after a certain threshold is reached, the balancing load stops working, and opens the balancing relay, at this time, whether the pressure difference between the static total voltages of each branch is within the balancing threshold is again confirmed, mode judgment is performed, if the pressure difference is within the balancing threshold, normal discharge is started, and if the pressure difference is not within the balancing threshold, the operation in the step S2.1 is repeated;
In the step S2.2, in the equalizing charge mode, the BMS controls the charging device to perform power reduction, then closes the branch relays of the branches except for the highest branch total voltage according to the static total voltage of each branch collected in the step S1, and then closes the charging relay to charge the multi-path parallel lithium battery system, after the total voltage of the multi-path parallel lithium battery system reaches a certain threshold, the charging device stops charging, and opens the charging relay, at this time, again confirms whether the differential pressure between the static total voltages of each branch is within the equalizing threshold, performs mode judgment, if so, starts full-power charging, and if not, repeats the operation in the step S2.2;
If the pressure difference between the static total voltages of the branches of each branch exceeds a set safety threshold, at the moment, if the static total voltages of the branches are in a charging state, entering an equalizing charge mode, and judging the mode after finishing the equalizing charge mode; if the multi-path parallel lithium battery system enters a standby mode in a discharging state, the multi-path parallel lithium battery system performs open-circuit shielding on a branch circuit with a fault in the standby mode, operates in a power-down mode and gives an alarm; at this time, the BMS collects the dynamic total voltage of the branch with the fault in real time, when the dynamic total voltage reaches an equilibrium threshold value, alarms and reminds and inquires whether a user tries to recover the normal mode, if the user selects to recover, the user is reminded to restart the system in a safe state, and then mode judgment is carried out again; if the user does not care, no operation is performed;
If the operation is performed in the equalizing charge mode for n times or the number of times of the recovery operation from the standby mode to the normal mode exceeds n times, n is more than or equal to 2, the multi-path parallel lithium battery system still cannot enter the normal mode, namely, a fault occurs in a certain branch, and the multi-path parallel lithium battery system enters the standby mode, in the standby mode, the multi-path parallel lithium battery system performs open circuit shielding on the branch with the fault, and performs power reduction operation while sending an alarm.
2. The control method of a multi-path parallel lithium battery system according to claim 1, wherein: under any mode, the current value of each branch current sensor is collected in real time and transmitted to the BMS, and if the current is abnormal, the BMS gives an alarm, and the corresponding branch is cut off or the whole multi-path lithium battery system for parallel connection is adopted.
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| CN111239634B (en) | 2020-03-20 | 2022-10-14 | 中创新航科技股份有限公司 | Method and device for detecting branch state of battery system |
| CN112109589B (en) * | 2020-09-22 | 2021-12-28 | 一汽解放汽车有限公司 | Battery fault processing method and device, vehicle and storage medium |
| CN113054698A (en) * | 2020-12-29 | 2021-06-29 | 潍柴动力股份有限公司 | Battery charging method, device, control unit and storage medium |
| CN114069785B (en) * | 2021-11-15 | 2024-03-19 | 上海优续新能源科技有限公司 | System and method for monitoring high-capacity lithium ion battery |
| CN114552718B (en) * | 2022-03-04 | 2022-12-09 | 福建时代星云科技有限公司 | Multi-branch parallel energy storage system and charging and discharging method |
| CN114516283B (en) * | 2022-03-18 | 2023-10-10 | 中国重汽集团济南动力有限公司 | Multi-redundancy vehicle-mounted power battery system and control method |
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