CN113119797A - Over-discharge prevention protection method, system and device for rechargeable battery assembly - Google Patents
Over-discharge prevention protection method, system and device for rechargeable battery assembly Download PDFInfo
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- CN113119797A CN113119797A CN202110437523.2A CN202110437523A CN113119797A CN 113119797 A CN113119797 A CN 113119797A CN 202110437523 A CN202110437523 A CN 202110437523A CN 113119797 A CN113119797 A CN 113119797A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides an over-discharge prevention protection method and system for a rechargeable battery assembly in the technical field of energy storage batteries, and the method of the device comprises the following steps: monitoring discharge parameter information of a battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, a discharge current value and a single cell voltage value; when the SOC of the battery assembly is lower than a preset SOC threshold value and a discharging current value is higher than a preset current threshold value, carrying out current limiting protection on the battery assembly; when the voltage value of the monomer battery cell in the battery assembly is lower than a preset voltage threshold, performing voltage stabilization protection on the monomer battery cell lower than the preset voltage threshold; the battery assembly comprises a plurality of battery cluster grid units, and each battery grid unit comprises a plurality of single battery cells. The invention aims at the problem of long-term over-discharge damage of single battery cores caused by performance difference, and effectively reduces the influence of the over-discharge of the battery on the performance and the service life of the battery.
Description
Technical Field
The invention relates to the technical field of energy storage batteries, in particular to an over-discharge prevention protection method, system and device for a rechargeable battery assembly.
Background
Along with the popularization of electric vehicles, it is urgently required that a rechargeable battery pack flexibly supplements the electric vehicle, the rechargeable battery pack integrates a large-capacity battery, frequent repeated charging and discharging is required, and frequent over-discharging of the battery pack causes irreversible damage to the battery pack.
The protection strategy in the existing market is single control residual capacity, because the rechargeable battery assembly is formed by connecting and combining hundreds of groups of battery cores in a series-parallel connection mode, the performance of the battery cores of the single battery cores can be different along with the increase of the charging and discharging times, and the battery performance is specifically embodied on the parameters of the voltage, the capacity and the like of the single battery cores, so that the voltage of the single battery cores can not be effectively judged through a pure whole pack residual capacity method, the current can not be limited when the voltage of the battery is reduced, the battery cores are effectively protected, and the service life of the battery is prolonged.
Disclosure of Invention
The invention aims to provide an over-discharge prevention protection method, system and device for a rechargeable battery assembly, which solve the problem of irreversible damage to the battery assembly caused by frequent over-discharge of the battery assembly in the repeated charging and discharging process of the rechargeable battery assembly, thereby effectively protecting a single battery cell in the battery assembly, prolonging the service life of the battery assembly and improving the use efficiency of the battery assembly during charging and discharging.
In order to achieve the above object of the present invention, the present invention is achieved by the following technical solutions:
the invention provides a protection method for preventing overdischarge of a rechargeable battery pack, which comprises the following steps:
monitoring discharge parameter information of the battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, a discharge current value and a single cell voltage value;
when the SOC of the battery assembly is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, carrying out current limiting protection on the battery assembly;
when the voltage value of the monomer battery cell in the battery assembly is lower than a preset voltage threshold, performing voltage stabilization protection on the monomer battery cell lower than the preset voltage threshold; the battery assembly comprises a plurality of battery cluster grid units, and each battery grid unit comprises a plurality of single battery cells.
Further, the current limiting protection of the battery assembly includes:
and starting a current limiting branch of a discharging loop where the battery component is positioned, limiting the current of the battery component, and continuously monitoring the discharging current value of the current component, wherein the current limiting branch comprises a current limiting circuit and a time delay circuit.
Further, after monitoring the discharge parameter information of the battery assembly, the method further comprises:
and when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharging current value is lower than the preset current threshold value, cutting off a discharging loop where the battery assembly is located to stop discharging the battery assembly.
Further, the performing voltage stabilization protection on the monomer electric core lower than the preset voltage threshold includes:
and switching off the battery cluster grid unit where the single battery cell lower than the preset voltage threshold is located, so that the battery cluster grid unit stops discharging outwards.
Further, the performing voltage stabilization protection on the monomer electric core lower than the preset voltage threshold further includes:
analyzing whether a single cell with a voltage value higher than the preset voltage threshold exists in the battery cluster grid unit;
when the single electric core with the single electric core voltage value higher than the preset voltage threshold exists in the battery cluster grid unit, the single electric core higher than the preset voltage threshold charges the single electric core lower than the preset voltage threshold.
Further, performing voltage stabilization protection on the monomer battery cell lower than the preset voltage threshold further includes:
and when the single battery cell lower than the preset voltage threshold value finishes charging, discharging the battery cluster grid unit where the single battery cell lower than the preset voltage threshold value is located again.
The invention also includes a protection system for preventing overdischarge of a rechargeable battery pack, comprising:
the battery assembly comprises a plurality of battery cluster grid units, and each battery cluster grid unit comprises a plurality of single battery cells;
the monitoring module monitors discharge parameter information of the battery assembly when the battery assembly is in a discharge state, wherein the discharge parameter information comprises: SOC, a discharge current value and a single cell voltage value;
the current limiting module is connected with the monitoring module, and performs current limiting protection on the battery assembly when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharge current value is higher than the preset current threshold value;
and the voltage stabilizing module is connected with the monitoring module, and when the voltage value of the monomer cell in the battery assembly is lower than the preset voltage threshold value, the monomer cell lower than the preset voltage threshold value is subjected to voltage stabilizing protection.
Further, the current limiting module includes:
the battery pack charging circuit comprises a current limiting circuit and a time delay circuit, wherein when the SOC of the battery pack is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, the current limiting circuit of a discharging loop where the battery pack is located is started, and the time for limiting the current of the battery pack is controlled through the time delay circuit.
Further, the voltage stabilization module includes:
the battery cluster grid control unit is used for switching off the battery cluster grid unit where the single battery cell lower than the preset voltage threshold value is located when the voltage value of the single battery cell in the battery assembly is lower than the preset voltage threshold value, so that the battery cluster grid unit stops discharging outwards; when the single battery cell lower than the preset voltage threshold value is charged, discharging the battery cluster grid unit where the single battery cell lower than the preset voltage threshold value is located again;
and the single cell control unit analyzes whether a single cell with a voltage value higher than the preset voltage threshold exists in the battery cluster grid unit, and when the single cell with the voltage value higher than the preset voltage threshold exists in the battery cluster grid unit, the single cell higher than the preset voltage threshold charges the single cell lower than the preset voltage threshold.
The invention also includes a protection device for preventing the over-discharge of the rechargeable battery assembly, comprising:
the battery assembly is connected with the slave module, the current limiting circuit and the voltage stabilizing circuit of the BMS, the battery assembly comprises a plurality of battery cluster grid units, and each battery cluster grid unit comprises a plurality of single battery cells;
the slave module of the BMS battery management system is connected with the current limiting circuit, the voltage stabilizing circuit and the BMS battery management system main control module, and when the battery assembly is in a discharging state, the slave module monitors the discharging parameter information of the battery assembly, receives the control information of the BMS battery management system main control module and controls the current limiting branch circuit and the voltage stabilizing circuit to be switched off; the discharge parameter information includes: SOC, a discharge current value and a single cell voltage value;
the BMS battery management system comprises a BMS battery management system main control module, a voltage stabilizing circuit starting module and a battery module, wherein the BMS battery management system main control module is used for analyzing battery parameter information collected by the BMS battery management system slave modules, outputting a current limiting protection starting instruction when the SOC of the battery assembly is lower than a preset SOC threshold value and a discharging current value is higher than a preset current threshold value, and outputting a voltage stabilizing circuit starting instruction when a single cell voltage value in the battery assembly is lower than a preset voltage threshold value;
the current limiting branch circuit is used for performing current limiting protection on the battery assembly;
and the voltage stabilizing circuit is used for performing voltage stabilizing protection on the monomer battery cell lower than the preset voltage threshold.
The invention provides a method, a system and a device for preventing over-discharge of a rechargeable battery pack, which at least have the following gain effects:
1) the irreversible damage to the battery caused by directly cutting off a discharging loop relay when the discharging current is overlarge in the over-discharging prevention process of the rechargeable battery assembly is solved, and the charging and discharging efficiency and the service life of the rechargeable battery assembly are effectively improved;
2) the problem of over-discharge prevention of the rechargeable battery assembly in the prior art is solved, the residual electric quantity is controlled singly, the voltage of a single battery cannot be judged effectively, the problem of long-term over-discharge damage caused by performance difference of single battery cells cannot be effectively solved, the overall efficiency of the rechargeable battery assembly caused by the performance difference of the single battery cells can be effectively reduced, and the charging and discharging efficiency and the service life of the battery are greatly improved.
Drawings
The above features, technical features, advantages and implementations of a method, a system and a device for protecting a rechargeable battery pack against overdischarge will be further explained in a clearly understandable manner with reference to the accompanying drawings.
FIG. 1 is a flow chart of one embodiment of a method for protecting a rechargeable battery pack against overdischarge in accordance with the present invention;
FIG. 2 is a flow chart of another embodiment of a method for protecting a rechargeable battery pack against overdischarge in accordance with the present invention;
FIG. 3 is a flow chart of another embodiment of a method for protecting a rechargeable battery pack against overdischarge in accordance with the present invention;
FIG. 4 is a flow chart of one embodiment of a protection system for preventing overdischarge of a rechargeable battery pack in accordance with the present invention;
FIG. 5 is a flow chart of an embodiment of a protection device for preventing overdischarge of a rechargeable battery pack according to the present invention;
fig. 6 is an exemplary diagram of one embodiment of a current limiting branch in a protection method for preventing overdischarge of a rechargeable battery pack according to the present invention;
FIG. 7 is an exemplary diagram of one embodiment of a voltage regulator circuit in a method for protecting a rechargeable battery pack against overdischarge in accordance with the present invention;
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
In one embodiment of the present invention, as shown in fig. 1, a method for protecting a rechargeable battery pack against overdischarge includes:
s100, monitoring discharge parameter information of the battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, discharge current value and single cell voltage value.
Specifically, soc (state of charge) refers to the state of charge of the battery, and is equal to (remaining charge in the battery/rated charge capacity of the battery) x 100%. In addition, the monitored discharge current value comprises a discharge current value directly output by the battery and a current limiting branch value output after passing through the current limiting branch. The monitored battery state parameters are used for judging whether the battery has over-discharge risks in the discharging process, wherein the collected parameters include but are not limited to an SOC value, a discharging current value, a single cell voltage value, temperature and the like.
S210, when the SOC of the battery assembly is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, carrying out current limiting protection on the battery assembly.
Specifically, a preset SOC threshold range should be set in combination with a battery discharge state, a discharge current threshold should be set in combination with battery parameter performance, and if the SOC is set to 10%, and the discharge current threshold is set to 10A, when the SOC of the battery assembly is higher than 10%, the battery assembly discharges normally, the SOC of the battery assembly is lower than 10%, and when the discharge current is higher than 10A, current limiting protection is started; and when the SOC of the battery pack is lower than 10% and the discharge current is lower than 10A, cutting off the external discharge of the battery pack.
S220, when the voltage value of the monomer cell in the battery assembly is lower than a preset voltage threshold, performing voltage stabilization protection on the monomer cell lower than the preset voltage threshold; the battery assembly comprises a plurality of battery cluster grid units, and each battery grid unit comprises a plurality of single battery cells.
Specifically, the battery assembly consists of N battery clusters, each battery cluster is formed by combining M single battery cells, the whole battery assembly consists of N × M single battery cells, when N is 3 and M is 10, the battery assembly consists of A, B, C and 3 battery cluster grid units, each battery cluster grid unit comprises 10 single battery cells, a 1-a 10, B1-B10 and C1-C10. And when the voltage value of the A1 single battery cell in the battery assembly is lower than a preset voltage threshold value, the grid unit of the A battery cluster is turned off to discharge outwards, and any one of the battery cells A2-A10 of which the voltage value is higher than the preset threshold value in the grid unit of the A battery cluster is used for charging the A1. The voltage threshold of the single cell should be set by combining battery parameters and temperature, and specifically should be between 1.8V and 2.0V.
Meanwhile, in this embodiment, the operation behaviors of the battery electrical component and the circuit may be monitored and controlled simultaneously, that is, there is a case that the battery cell with the voltage threshold lower than the preset voltage threshold in the battery component charges the battery cell with the voltage threshold lower than the preset voltage threshold when the current limiting circuit is started, and the case that the battery cell with the voltage threshold higher than the preset voltage threshold cuts off the charging when the voltage of the battery cell with the voltage threshold higher than the preset voltage threshold is lower than the preset voltage threshold in the charging process when the battery cell with the voltage threshold higher than the preset voltage threshold charges the battery cell with the voltage threshold lower than the preset voltage threshold.
The charging and discharging circuit can solve the problem that irreversible damage is brought to the battery by directly cutting off the discharging loop relay when the discharging current is overlarge in the overdischarging prevention process of the charging battery assembly, and effectively improves the charging and discharging efficiency and the service life of the charging battery assembly; the problem of over-discharge prevention of the rechargeable battery assembly in the prior art is solved, the residual electric quantity is controlled singly, the voltage of a single battery cannot be judged effectively, the problem of long-term over-discharge damage caused by performance difference of single battery cells cannot be effectively solved, the overall efficiency of the rechargeable battery assembly caused by the performance difference of the single battery cells can be effectively reduced, and the charging and discharging efficiency and the service life of the battery are greatly improved.
In another embodiment of the present invention, as shown in fig. 2, a method for protecting a rechargeable battery from over-discharge includes:
s100, monitoring discharge parameter information of the battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, discharge current value and single cell voltage value.
Specifically, soc (state of charge) refers to the state of charge of the battery, and is equal to (remaining charge in the battery/rated charge capacity of the battery) x 100%. In addition, the discharge current value monitored comprises a discharge current value directly output by the battery and a current limiting branch value output after passing through the current limiting branch. The monitored battery state parameters are used for judging whether the battery has over-discharge risks in the discharging process, wherein the collected parameters include but are not limited to an SOC value, a discharging current value, a single cell voltage value, temperature and the like.
S211, starting a current limiting branch of a discharging loop where the battery assembly is located, limiting the current of the battery assembly, and continuously monitoring the discharging current value of the current assembly, wherein the current limiting branch comprises a current limiting circuit and a time delay circuit.
Specifically, in the discharging process of the rechargeable battery assembly, the BMS battery management system monitors the SOC value of the battery, and when the SOC value is higher than a preset current threshold, the discharging circuit works normally; when the BMS battery management system analyzes that the discharge current value is higher than the preset current threshold value, the BMS battery management system starts the current limiting circuit, and monitors the discharge current value again after the delay operation of the current limiting branch circuit.
S212, when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharging current value is lower than the preset current threshold value, the discharging loop where the battery assembly is located is cut off, and the battery assembly stops discharging.
Specifically, the BMS monitors a discharge current value when the SOC value is less than a predetermined current threshold; and when the discharge current value is smaller than the preset current threshold value, the discharge loop relay is cut off.
Preferably, after the BMS battery management system receives the discharging current application of the external circuit, the relay of the discharging circuit is opened, the discharging current of the battery pack is managed and controlled according to the current environment, the SOC state of the battery pack is monitored in real time along with the discharging of the battery pack, when the SOC of the battery pack is lower than 10%, the discharging state of the battery pack is monitored by the BMS battery management system, if the discharging current is larger than 10A at the moment, in order to prevent the damage of the current output to the electric core from being immediately turned off, the BMS battery management system starts the current limiting circuit of the discharging circuit, the discharging current output of the battery pack is reduced, the time is delayed by 3S, the BMS battery control system cuts off the relay of the discharging circuit after the discharging current is monitored to be lower than.
S220, when the voltage value of the monomer cell in the battery assembly is lower than a preset voltage threshold, performing voltage stabilization protection on the monomer cell lower than the preset voltage threshold; the battery assembly comprises a plurality of battery cluster grid units, and each battery grid unit comprises a plurality of single battery cells.
Specifically, the battery assembly consists of N battery clusters, each battery cluster is formed by combining M single battery cells, the whole battery assembly consists of N × M single battery cells, when N is 3 and M is 10, the battery assembly consists of A, B, C and 3 battery cluster grid units, each battery cluster grid unit comprises 10 single battery cells, a 1-a 10, B1-B10 and C1-C10. And when the voltage value of the A1 single battery cell in the battery assembly is lower than a preset voltage threshold value, the grid unit of the A battery cluster is turned off to discharge outwards, and any one of the battery cells A2-A10 of which the voltage value is higher than the preset threshold value in the grid unit of the A battery cluster is used for charging the A1. The voltage threshold of the single cell should be set by combining battery parameters and temperature, and specifically should be between 1.8V and 2.0V.
In this embodiment, the monitoring and controlling operations of the battery electrical component and the circuit may be performed simultaneously, that is, there is a case that a cell higher than the preset voltage threshold in the battery component charges a cell with a low voltage threshold and a cell with a preset voltage threshold while the current limiting circuit is started, and the case that the cell voltage value higher than the preset voltage threshold cuts off charging when the voltage of the cell higher than the preset voltage threshold is lower than the preset voltage threshold during the charging process when the cell higher than the preset voltage threshold charges the cell with the low voltage threshold and the cell with the preset voltage threshold is included at the same time.
And in this embodiment, when it is detected that the SOC of the battery assembly is lower than the predetermined SOC threshold and the discharge current is higher than the predetermined current threshold, the current limiting branch connected to the battery circuit is started by the BMS battery management system, and after passing through the delay current limiting circuit, if the discharge current value is lower than the preset current threshold, the discharge circuit relay is controlled to interrupt the discharge circuit. In the prior art, when the over-discharge state of the lithium battery component is detected, the damage of the over-discharge of the battery component to the battery component is reduced by adopting a method of directly cutting off a discharge loop. However, when the discharge circuit of the battery pack is cut off, the lithium ions are collected on the surface of the battery due to the excessive discharge current, and irreversible damage is still caused to the battery. The control method preprocesses the discharge loop of the over-discharged battery pack, prevents the irreversible damage to the battery pack caused by overlarge discharge current when the discharge of the battery pack is interrupted, and effectively prolongs the service life and the charge-discharge efficiency of the battery pack.
In another embodiment of the present invention, as shown in fig. 3, a method for protecting a rechargeable battery from over-discharge includes:
s100, monitoring discharge parameter information of the battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, discharge current value and single cell voltage value.
Specifically, soc (state of charge) refers to the state of charge of the battery, and is equal to (remaining charge in the battery/rated charge capacity of the battery) x 100%. In addition, the discharge current value monitored comprises a discharge current value directly output by the battery and a current limiting branch value output after passing through the current limiting branch. The monitored battery state parameters are used for judging whether the battery has over-discharge risks in the discharging process, wherein the collected parameters include but are not limited to an SOC value, a discharging current value, a single cell voltage value, temperature and the like.
S210, when the SOC of the battery assembly is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, carrying out current limiting protection on the battery assembly.
Specifically, a preset SOC threshold range should be set in combination with a battery discharge state, a discharge current threshold should be set in combination with battery parameter performance, and if the SOC is set to 10%, and the discharge current threshold is set to 10A, when the SOC of the battery assembly is higher than 10%, the battery assembly discharges normally, the SOC of the battery assembly is lower than 10%, and when the discharge current is higher than 10A, current limiting protection is started; and when the SOC of the battery pack is lower than 10% and the discharge current is lower than 10A, cutting off the external discharge of the battery pack.
And S221, the battery assembly comprises a plurality of battery cluster grid units, each battery grid unit comprises a plurality of single battery cells, and the battery cluster grid unit in which the single battery cells lower than a preset voltage threshold are located is turned off, so that the battery cluster grid unit stops discharging outwards.
Specifically, voltage values of single battery cells in the battery assembly are obtained and analyzed, when the voltage values of the single battery cells in the battery assembly are larger than a preset voltage threshold, a voltage stabilizing circuit in the battery assembly is turned off through output, and a grid unit where the voltage values of the single battery cells in the battery assembly are larger than the preset voltage threshold is turned on to supply power to the outside; and when the voltage value of the single cell in the battery assembly is smaller than the preset voltage threshold, starting a voltage stabilizing circuit in the battery assembly, and stopping the grid unit where the single cell in the battery assembly is smaller than the preset voltage threshold to supply power to the outside.
S222, monitoring voltage values of other single battery cells in the grid unit of the battery cluster, where the voltage values are lower than a preset voltage threshold.
And S223, when the monomer electric cores with the electric core voltage values higher than the preset voltage threshold exist in the rest of the monomer electric cores, charging the monomer electric cores with the electric core voltages higher than the preset voltage threshold to the monomer electric cores lower than the preset voltage threshold.
And S224, when the single battery cell lower than the preset voltage threshold value is charged, discharging the battery cluster grid unit where the single battery cell lower than the preset voltage threshold value is located again.
Specifically, when a cell with a voltage value higher than the preset voltage threshold exists in the power cluster grid unit, the voltage stabilizing circuit is controlled to charge the cell higher than the preset voltage threshold in the power cluster grid unit to a cell lower than the preset voltage threshold, and the cell with the deviation of the cell voltage and the preset voltage threshold exceeding 10mv and deviating most seriously in the power cluster grid unit is balanced first. When the voltages of the single battery cells in the power supply cluster grid unit are within +/-10 mV of a preset voltage threshold, judging that the single battery cells in the power supply cluster grid unit do not need to be balanced, starting the power supply cluster grid unit to supply power to the outside, and continuously acquiring the voltage information of the single battery cells by the BMS battery management system in the process.
Meanwhile, in this embodiment, the operation behaviors of the battery electrical component and the circuit may be monitored and controlled simultaneously, that is, there is a case that the battery cell with the voltage threshold lower than the preset voltage threshold in the battery component charges the battery cell with the voltage threshold lower than the preset voltage threshold when the current limiting circuit is started, and the case that the battery cell with the voltage threshold higher than the preset voltage threshold cuts off the charging when the voltage of the battery cell with the voltage threshold higher than the preset voltage threshold is lower than the preset voltage threshold in the charging process when the battery cell with the voltage threshold higher than the preset voltage threshold charges the battery cell with the voltage threshold lower than the preset voltage threshold.
Preferably, the BMS battery management system actively monitors the N x M individual cells of the rechargeable battery pack, when the voltage of a certain single battery cell is lower than 2.0V, the BMS battery management system controls a PMOS circuit of an active equalization circuit of a battery cluster grid unit where the battery cell is positioned, the battery cluster grid unit is switched off to discharge outwards, and then the voltage of other battery cells in the battery cluster grid unit is monitored, if the battery cell larger than 2.0V exists in the battery cluster grid unit, the single battery cell with the higher voltage threshold value and the preset voltage threshold value in the battery cluster power grid is controlled to charge the single battery cell lower than the preset voltage threshold value, when the voltage of each cell in the grid unit of the battery cluster in which the cell is positioned is within 2.0V +/-10 mV, and judging that the single battery cells in the battery cluster grid power supply do not need to be balanced, and restarting the battery cluster grid unit by the BMS battery management system to supply power to the outside.
The embodiment solves the problems that in the prior art, when the battery assembly is protected against over-discharge, whether the battery is in an over-discharge state is analyzed only by detecting the overall parameters of the battery, and the damage to the single battery cell caused by the over-discharge method of the battery is avoided by cutting off a discharge loop after the voltage values of the single battery cell in the battery are detected to be different. The method can avoid the influence of the over-low voltage of the single cell on the overall charge-discharge efficiency of the battery assembly in the over-discharge process of the battery, and effectively prolong the service life of the battery.
In one embodiment of the present invention, as shown in fig. 4, a schematic diagram of an anti-overdischarge protection system for a rechargeable battery pack includes:
the battery assembly 10 includes a plurality of battery cluster grid units, each including a plurality of battery cells.
The monitoring module 20 is used for monitoring the discharging parameter information of the battery assembly when the battery assembly is in a discharging state; the discharge parameter information includes: SOC, discharge current value and single cell voltage value.
Specifically, soc (state of charge) refers to the state of charge of the battery, and is equal to (remaining charge in the battery/rated charge capacity of the battery) x 100%. In addition, the discharge current value monitored comprises a discharge current value directly output by the battery and a current limiting branch value output after passing through the current limiting branch. The monitored battery state parameters are used for judging whether the battery has over-discharge risks in the discharging process, wherein the collected parameters include but are not limited to an SOC value, a discharging current value, a single cell voltage value, temperature and the like.
And the current limiting module 30 is connected with the monitoring module and is used for performing current limiting protection on the battery assembly when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharging current value is higher than the preset current threshold value.
Specifically, a preset SOC threshold range should be set in combination with a battery discharge state, a discharge current threshold should be set in combination with battery parameter performance, and if the SOC is set to 10%, and the discharge current threshold is set to 10A, when the SOC of the battery assembly is higher than 10%, the battery assembly discharges normally, the SOC of the battery assembly is lower than 10%, and when the discharge current is higher than 10A, current limiting protection is started; and when the SOC of the battery pack is lower than 10% and the discharge current is lower than 10A, cutting off the external discharge of the battery pack.
And the voltage stabilizing module 40 is connected with the monitoring module and used for performing voltage stabilizing protection on the monomer battery cell lower than the preset voltage threshold when the voltage value of the monomer battery cell in the battery assembly is lower than the preset voltage threshold.
Specifically, the battery assembly consists of N battery clusters, each battery cluster is formed by combining M single battery cells, the whole battery assembly consists of N × M single battery cells, when N is 3 and M is 10, the battery assembly consists of A, B, C and 3 battery cluster grid units, each battery cluster grid unit comprises 10 single battery cells, a 1-a 10, B1-B10 and C1-C10. And when the voltage value of the A1 single battery cell in the battery assembly is lower than a preset voltage threshold value, the grid unit of the A battery cluster is turned off to discharge outwards, and any one of the battery cells A2-A10 of which the voltage value is higher than the preset threshold value in the grid unit of the A battery cluster is used for charging the A1. The voltage threshold of the single cell should be set by combining battery parameters and temperature, and specifically should be between 1.8V and 2.0V.
Meanwhile, in this embodiment, the operation behaviors of the battery electrical component and the circuit may be monitored and controlled simultaneously, that is, there is a case that the battery cell with the voltage threshold lower than the preset voltage threshold in the battery component charges the battery cell with the voltage threshold lower than the preset voltage threshold when the current limiting circuit is started, and the case that the battery cell with the voltage threshold higher than the preset voltage threshold cuts off the charging when the voltage of the battery cell with the voltage threshold higher than the preset voltage threshold is lower than the preset voltage threshold in the charging process when the battery cell with the voltage threshold higher than the preset voltage threshold charges the battery cell with the voltage threshold lower than the preset voltage threshold.
Based on the foregoing embodiment, the current limiting module 20 includes:
the battery pack charging circuit comprises a current limiting circuit and a time delay circuit, wherein when the SOC of the battery pack is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, the current limiting circuit of a discharging loop where the battery pack is located is started, and the time for limiting the current of the battery pack is controlled through the time delay circuit.
Specifically, in the discharging process of the rechargeable battery assembly, the BMS battery management system monitors the SOC value of the battery, and when the SOC value is higher than a preset current threshold, the discharging circuit works normally; when the BMS battery management system analyzes that the discharge current value is higher than the preset current threshold value, the BMS battery management system starts the current limiting circuit, and monitors the discharge current value again after the delay operation of the current limiting branch circuit.
When the SOC value is lower than a preset current threshold value, the BMS battery management system monitors a discharging current value; and when the discharge current value is smaller than the preset current threshold value, the discharge loop relay is cut off.
Preferably, after the BMS battery management system receives the discharging current application of the external loop, the relay of the discharging loop is turned on, the discharging current of the battery is controlled according to the current environment management, the SOC state of the battery is detected in real time along with the discharging of the battery, when the SOC of the battery is lower than 10%, the BMS battery management system monitors the discharging state of the battery, if the discharging current is larger than 10A, in order to prevent the damage of the current output to the battery cell from being turned off immediately, the BMS battery management system starts the current limiting circuit of the discharging loop, the discharging current output of the battery is reduced, the time is delayed by 3S, the BMS battery control system cuts off the relay of the discharging loop after the discharging current is monitored to be lower than 10A, and the battery is turned off.
In the module, when the SOC of the battery is detected to be lower than a preset SOC threshold value and the discharging current is detected to be higher than a preset current threshold value, a current limiting branch circuit connected with a battery loop is started through a BMS battery management system, and after the battery SOC is delayed for a current limiting circuit, if the discharging current value is lower than a preset current threshold value, a discharging loop relay is controlled to interrupt the discharging circuit. In the prior art, when the battery pack is detected to be in an over-discharge state, the damage of the over-discharge of the battery pack to the battery pack is reduced by directly cutting off a discharge loop. However, when the discharge circuit of the battery pack is cut off, the lithium ions are collected on the surface of the battery due to the excessive discharge current, and irreversible damage is still caused to the battery. The control method preprocesses the discharge loop of the over-discharged battery pack, prevents the irreversible damage to the battery pack caused by overlarge discharge current when the discharge of the battery pack is interrupted, and effectively prolongs the service life and the charge-discharge efficiency of the battery pack.
Based on the foregoing embodiment, the voltage stabilization module 30 includes:
the battery cluster grid control unit is used for switching off the battery cluster grid unit where the single battery cell lower than the preset voltage threshold is located, so that the battery cluster grid unit stops discharging outwards or discharges again;
specifically, the voltage stabilizing module acquires and analyzes a voltage value of a single cell in the battery assembly, and when the voltage value of the single cell in the battery assembly is greater than a preset voltage threshold, the voltage stabilizing circuit in the battery assembly is closed, and a grid unit where the voltage value of the single cell in the battery assembly is greater than the preset voltage threshold is started to supply power to the outside; and when the voltage value of the single cell in the battery assembly is smaller than the preset voltage threshold, starting a voltage stabilizing circuit in the battery assembly, and stopping the grid unit where the single cell in the battery assembly is smaller than the preset voltage threshold to supply power to the outside.
And the single cell control unit is used for controlling the single cell higher than the preset voltage threshold value to charge the single cell lower than the preset voltage threshold value.
Preferably, the BMS battery management system actively monitors the N x M individual cells of the rechargeable battery pack, when the voltage of a certain single battery cell is lower than 2.0V, the BMS battery management system controls a PMOS circuit of an active equalization circuit of a battery cluster grid unit where the battery cell is positioned, the battery cluster grid unit is switched off to discharge outwards, and then the voltage of other battery cells in the battery cluster grid unit is monitored, if the battery cell larger than 2.0V exists in the battery cluster grid unit, the single battery cell with the higher voltage threshold value and the preset voltage threshold value in the battery cluster power grid is controlled to charge the single battery cell lower than the preset voltage threshold value, when the voltage of each cell in the grid unit of the battery cluster in which the cell is positioned is within 2.0V +/-10 mV, and judging that the single battery cells in the battery cluster grid power supply do not need to be balanced, and restarting the battery cluster grid unit by the BMS battery management system to supply power to the outside.
The module solves the problems that in the prior art, when the battery assembly is protected from over-discharge, whether the battery is in an over-discharge state is analyzed only by detecting overall parameters of the battery, and damage to a single battery cell caused by a battery over-discharge method is avoided by cutting off a discharge loop after voltage values of the single battery cell in the battery are monitored to be different. The method can avoid the influence of the over-low voltage of the single cell on the overall charge-discharge efficiency of the battery assembly in the over-discharge process of the battery, and effectively prolong the service life of the battery.
In one embodiment of the present invention, as shown in fig. 5, a schematic diagram of an anti-overdischarge protection device for a rechargeable battery pack includes:
the battery assembly 10 includes a plurality of battery cluster grid units, each including a plurality of battery cells.
Specifically, soc (state of charge) refers to the state of charge of the battery, and is equal to (remaining charge in the battery/rated charge capacity of the battery) x 100%. In addition, the monitored discharge current value comprises a discharge current value directly output by the battery and a current limiting branch value output after passing through the current limiting branch. The monitored battery state parameters are used for judging whether the battery has over-discharge risks in the discharging process, wherein the collected parameters include but are not limited to an SOC value, a discharging current value, a single cell voltage value, temperature and the like.
The slave module 20 of the BMS battery management system is connected with the current limiting circuit, the voltage stabilizing circuit and the BMS battery management system main control module, and when the battery assembly is in a discharging state, the slave module monitors the discharging parameter information of the battery assembly, receives the control information of the BMS battery management system main control module and controls the current limiting branch circuit to be disconnected with the voltage stabilizing circuit; the discharge parameter information includes: SOC, discharge current value and single cell voltage value.
The BMS battery management system main control module 30 is configured to analyze battery parameter information collected by the BMS battery management system slave modules, output a command to start current limiting protection when the SOC of the battery assembly is lower than a preset SOC threshold and the discharging current value is higher than a preset current threshold, and output a command to start a voltage stabilizing circuit when a single cell voltage value existing in the battery assembly is lower than a preset voltage threshold.
And the current limiting circuit 40 is connected with the battery assembly and is used for carrying out current limiting protection on the battery assembly.
Specifically, in the discharging process of the rechargeable battery assembly, the BMS battery management system monitors the SOC value of the battery, and when the SOC value is higher than a preset current threshold, the discharging circuit works normally; when the BMS battery management system analyzes that the discharge current value is higher than the preset current threshold value, the BMS battery management system starts the current limiting circuit, and monitors the discharge current value again after the delay operation of the current limiting branch circuit.
Illustratively, as shown in fig. 6, the current limiting branch configured in the rechargeable battery pack according to the present invention includes but is not limited to a current limiting branch composed of 1 transistor and 4 fets, 17 resistors, 2 zener diodes, 1 operational amplifier, and a power supply; the current-limiting branch circuit comprises four current-limiting units, wherein one current-limiting unit is formed by connecting a source electrode of a field-effect transistor Q2 with a 24V input, a grid electrode of a field-effect transistor Q2 is connected with an R5 resistor and then connected with a collector electrode of a triode Q1, a source electrode of the field-effect transistor Q2 is respectively connected with an R13 resistor and then grounded, is connected with an R9 resistor and then connected with the reverse input of an LM358 operational amplifier, and is connected with an R9 resistor and an R4 resistor and then connected with the output of an LM358 double operational amplifier; the source, the grid and the drain of the field effect transistors of the four current limiting units Q2, Q3, Q4 and Q5 are connected in parallel; the LM358 is connected with the R2 resistor and then connected to the 24V output, and the output of the LM358 operational amplifier is connected with the R3 resistor and then connected with the base electrode of the triode Q1; an emitter of the triode Q1 is connected with the R1 in series and then is respectively connected with the 24V output and the positive electrode of the 24V battery, and a collector of the triode Q1 is connected with the R17 resistor in series and then is connected with the negative electrode of the 24V battery; a zener diode D1 is connected between the 24V output and the LM358 operational amplifier forward input, and a zener diode D2 is connected between the 24V output and the R5, R6, R7, R8 resistors and fet gates. The current flows into a source electrode of a field effect tube Q2 in the current limiting unit from the 24V input end, is connected to the reverse input end of the LM358 amplifier after being limited by the field effect tube, and is output from the 24V output end after being delayed by the LM 358; the delay time of the current limiting branch circuit after delay is 3S, the delay time setting is determined by the numerical value of components in the circuit and is not a limited value.
When the SOC value is lower than a preset current threshold value, the BMS battery management system monitors a discharging current value; and when the discharge current value is smaller than the preset current threshold value, the discharge loop relay is cut off.
Preferably, after the BMS battery management system receives the discharging current application of the external loop, the relay of the discharging loop is turned on, the discharging current of the battery is controlled according to the current environment management, the SOC state of the battery is detected in real time along with the discharging of the battery, when the SOC of the battery is lower than 10%, the BMS battery management system monitors the discharging state of the battery, if the discharging current is larger than 10A, in order to prevent the damage of the current output to the battery cell from being turned off immediately, the BMS battery management system starts the current limiting circuit of the discharging loop, the discharging current output of the battery is reduced, the time is delayed by 3S, the BMS battery control system cuts off the relay of the discharging loop after the discharging current is monitored to be lower than 10A, and the battery is turned off.
In the circuit, when the SOC of the battery is detected to be lower than a preset SOC threshold value and the discharge current is detected to be higher than a preset current threshold value, a current limiting branch circuit connected with a battery loop is started through a BMS battery management system, and after the battery SOC is delayed by a current limiting circuit, if the discharge current value is lower than the preset current threshold value, a discharge loop relay is controlled to interrupt the discharge circuit. In the prior art, when the battery pack is detected to be in an over-discharge state, the damage of the over-discharge of the battery pack to the battery pack is reduced by directly cutting off a discharge loop. However, when the discharge circuit of the battery pack is cut off, the lithium ions are collected on the surface of the battery due to the excessive discharge current, and irreversible damage is still caused to the battery. The control method preprocesses the discharge loop of the over-discharged battery pack, prevents the irreversible damage to the battery pack caused by overlarge discharge current when the discharge of the battery pack is interrupted, and effectively prolongs the service life and the charge-discharge efficiency of the battery pack.
And the voltage stabilizing circuit 50 is connected with the battery assembly and is used for performing voltage stabilizing protection on the single battery cell lower than the preset voltage threshold.
Specifically, the voltage stabilizing circuit acquires and analyzes a voltage value of a single cell in the battery assembly, and when the voltage value of the single cell in the battery assembly is greater than a preset voltage threshold, the voltage stabilizing circuit in the battery assembly is turned off, and a grid unit where the voltage value of the single cell in the battery assembly is greater than the preset voltage threshold is turned on to supply power to the outside; and when the voltage value of the single cell in the battery assembly is smaller than the preset voltage threshold, starting a voltage stabilizing circuit in the battery assembly, and stopping the grid unit where the single cell in the battery assembly is smaller than the preset voltage threshold to supply power to the outside.
When the single cell with the voltage value higher than the preset voltage threshold exists in the power cluster grid unit, the voltage stabilizing circuit is controlled to enable the cell higher than the preset voltage threshold in the power cluster grid unit to charge the cell lower than the preset voltage threshold, and the cell with the deviation of the single voltage and the preset voltage threshold in the power cluster grid unit exceeding 10mv and deviating most seriously is balanced firstly. When the voltages of the single battery cells in the power supply cluster grid unit are within +/-10 mV of a preset voltage threshold, judging that the single battery cells in the power supply cluster grid unit do not need to be balanced, starting the power supply cluster grid unit to supply power to the outside, and continuously acquiring the voltage information of the single battery cells by the BMS battery management system in the process.
For example, as shown in fig. 7, the voltage regulator circuit designed in the present invention functions to turn off a specific cell grid unit in a battery so as to protect cell voltages in the cell grid unit, and includes, but is not limited to, 7 voltage regulator units, where each voltage regulator unit uses a drain and a SOURCE of a PMOS circuit to be connected in series with two ends of each cell, and controls the external power supply of each power cluster grid unit, the cell units are connected in series, and after PMOS transistors are connected in parallel between the voltage regulator units, one end of each voltage regulator unit is connected to a SOURCE pin of an EMB1428 chip, and the other end of each voltage regulator unit is connected to a GATE pin of an EMB1428 chip, and EN, DIR-RT, FAULT0, FAULT1, and FAULT 2 pins are connected to each other, output signals of SD0 and FAULT-INT pins of the EMB 8 chip are connected to a CPU/MCU, and the CPU/MCU outputs signals to CS of the EMB 8 chip respectively, SD1, SCUK, RST pins, and output to the VSET pin of the EMB1499 chip through DAC D/A converter, the GATE-HS2, GATE-HS2, VSENSE-HS, CELLPLUS, GATE-LS, VSENSE-LS, PWM-CLAMP pins of the EMB1499 are connected to the auxiliary external circuit of the EMB1499, the VINA, VINP are connected to the 12V power supply, VINF, PVINF, PGNDF, GND are connected to the auxiliary power supply, when the SOURCE, GATE pins of the EMB1428 output signals, the opening of the PMOS circuit is controlled, the CPU/MCU, the EMB1428 chip, and the EMB1499 chip control the opening of each voltage stabilizing unit in the voltage stabilizing circuit together; the circuit for charging the single battery cells realizes the charging of the high-voltage battery cells to the low-voltage battery cells in the battery under the action of the circuit for charging the single battery cells, and comprises a battery pack which is formed by connecting the single battery cells in series or in parallel, wherein two poles of the battery cells are connected to a drain electrode and a source electrode of a PMOS circuit, and the function of charging the battery cells which are higher than a preset voltage threshold value and are lower than the preset voltage threshold value is realized by controlling the on-off of the PMOS circuit.
Preferably, the BMS battery management system actively monitors the N x M individual cells of the rechargeable battery pack, when the voltage of a certain single battery cell is lower than 2.0V, the BMS battery management system controls a PMOS circuit of an active equalization circuit of a battery cluster grid unit where the battery cell is positioned, the battery cluster grid unit is switched off to discharge outwards, and then the voltage of other battery cells in the battery cluster grid unit is monitored, if the battery cell larger than 2.0V exists in the battery cluster grid unit, the single battery cell with the higher voltage threshold value and the preset voltage threshold value in the battery cluster power grid is controlled to charge the single battery cell lower than the preset voltage threshold value, when the voltage of each cell in the grid unit of the battery cluster in which the cell is positioned is within 2.0V +/-10 mV, and judging that the single battery cells in the battery cluster grid power supply do not need to be balanced, and restarting the battery cluster grid unit by the BMS battery management system to supply power to the outside.
The module solves the problems that in the prior art, when the battery assembly is protected from over-discharge, whether the battery is in an over-discharge state is analyzed only by detecting overall parameters of the battery, and damage to a single battery cell caused by a battery over-discharge method is avoided by cutting off a discharge loop after voltage values of the single battery cell in the battery are monitored to be different. The method can avoid the influence of the over-low voltage of the single cell on the overall charge-discharge efficiency of the battery assembly in the over-discharge process of the battery, and effectively prolong the service life of the battery.
In the above embodiment, the specific expression of the rechargeable battery assembly may be a mobile energy storage battery car, a mobile energy storage battery pack, an energy storage battery pile, an energy storage battery box, or other devices. The rechargeable battery assembly includes, but is not limited to, a BMS management system chip, a rechargeable battery assembly, a circuit external to the current limiting branch, and a circuit external to the voltage stabilizing circuit. Those skilled in the art will appreciate that fig. 5 is merely an example of a rechargeable battery pack, and does not constitute a limitation of a rechargeable battery pack, and may include more or fewer components than shown, or some components in combination, or different components, such as: the rechargeable battery pack may also include input/output interfaces, display devices, network access devices, communication buses, communication interfaces, and the like. The BMS slave module is connected with the BMS main control module through a CAN intranet bus and is assisted with a DC/DC converter, and the BMS device and the battery equipment are integrated into a whole battery assembly.
Detecting battery device operating parameters from the slave modules by the BMS including, without limitation: SOC, discharge current value, discharge voltage value, temperature. The BMS main control module analyzes the parameters detected by the slave modules and outputs corresponding operation instructions to control the slave modules of the BMS battery management system to switch on and off the current limiting circuit and the voltage stabilizing circuit.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or recited in detail in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided herein, it should be understood that the disclosed battery assembly/anti-over-discharge system and method may be implemented in other ways. For example, the above-described battery pack/anti-over-discharge system and method embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units or integrated circuits, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A protection method for preventing overdischarge of a rechargeable battery pack is characterized by comprising the following steps:
monitoring discharge parameter information of a battery assembly when the battery assembly is in a discharge state; the discharge parameter information includes: SOC, a discharge current value and a single cell voltage value;
when the SOC of the battery assembly is lower than a preset SOC threshold value and a discharging current value is higher than a preset current threshold value, carrying out current limiting protection on the battery assembly;
when the voltage value of the monomer battery cell in the battery assembly is lower than a preset voltage threshold, performing voltage stabilization protection on the monomer battery cell lower than the preset voltage threshold; the battery assembly comprises a plurality of battery cluster grid units, and each battery grid unit comprises a plurality of single battery cells.
2. The method for protecting a rechargeable battery pack from over-discharge according to claim 1, wherein the current-limiting protection of the battery pack comprises:
and starting a current limiting branch of a discharging loop where the battery component is positioned, limiting the current of the battery component, and continuously monitoring the discharging current value of the current component, wherein the current limiting branch comprises a current limiting circuit and a time delay circuit.
3. The method for protecting a rechargeable battery pack against over-discharge according to claim 1, further comprising, after the monitoring of the discharge parameter information of the battery pack:
and when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharging current value is lower than the preset current threshold value, cutting off a discharging loop where the battery assembly is located to stop discharging the battery assembly.
4. The method for protecting the rechargeable battery pack from over-discharge according to claim 1, wherein the voltage-stabilizing protection of the cell below the preset voltage threshold includes:
and switching off the battery cluster grid unit where the single battery cell lower than the preset voltage threshold is located, so that the battery cluster grid unit stops discharging outwards.
5. The method for protecting the rechargeable battery pack from over-discharge according to any one of claims 1 to 4, wherein the voltage-stabilizing protection of the cell below the preset voltage threshold further comprises:
analyzing whether a single cell with a voltage value higher than the preset voltage threshold exists in the battery cluster grid unit;
when the single electric core with the single electric core voltage value higher than the preset voltage threshold exists in the battery cluster grid unit, the single electric core higher than the preset voltage threshold charges the single electric core lower than the preset voltage threshold.
6. The method for protecting the rechargeable battery pack from over-discharge according to any one of claims 1 to 4, wherein the voltage-stabilizing protection of the cell below the preset voltage threshold further comprises:
and when the single battery cell lower than the preset voltage threshold value finishes charging, discharging the battery cluster grid unit where the single battery cell lower than the preset voltage threshold value is located again.
7. An overdischarge protection system for a rechargeable battery pack, comprising:
the battery assembly comprises a plurality of battery cluster grid units, and each battery cluster grid unit comprises a plurality of single battery cells;
the monitoring module monitors discharge parameter information of the battery assembly when the battery assembly is in a discharge state, wherein the discharge parameter information comprises: SOC, a discharge current value and a single cell voltage value;
the current limiting module is connected with the monitoring module, and performs current limiting protection on the battery assembly when the SOC of the battery assembly is lower than the preset SOC threshold value and the discharge current value is higher than the preset current threshold value;
and the voltage stabilizing module is connected with the monitoring module, and when the voltage value of the monomer cell in the battery assembly is lower than the preset voltage threshold value, the monomer cell lower than the preset voltage threshold value is subjected to voltage stabilizing protection.
8. The system of claim 7, wherein the current limiting module comprises:
the battery pack charging circuit comprises a current limiting circuit and a time delay circuit, wherein when the SOC of the battery pack is lower than a preset SOC threshold value and the discharging current value is higher than a preset current threshold value, the current limiting circuit of a discharging loop where the battery pack is located is started, and the time for limiting the current of the battery pack is controlled through the time delay circuit.
9. The system of claim 7, wherein the voltage regulator module comprises:
the battery cluster grid control unit is used for switching off the battery cluster grid unit where the single battery cell lower than the preset voltage threshold is located, so that the battery cluster grid unit stops discharging outwards or discharges again;
and the single cell control unit is used for controlling the single cell higher than the preset voltage threshold value to charge the single cell lower than the preset voltage threshold value.
10. An overdischarge protection device for a rechargeable battery pack, comprising:
the battery assembly is connected with the slave module, the current limiting circuit and the voltage stabilizing circuit of the BMS, the battery assembly comprises a plurality of battery cluster grid units, and each battery cluster grid unit comprises a plurality of single battery cells;
the slave module of the BMS battery management system is connected with the current limiting circuit, the voltage stabilizing circuit and the BMS battery management system main control module, and when the battery assembly is in a discharging state, the slave module monitors the discharging parameter information of the battery assembly, receives the control information of the BMS battery management system main control module and controls the current limiting branch circuit and the voltage stabilizing circuit to be switched off; the discharge parameter information includes: SOC, a discharge current value and a single cell voltage value;
the BMS battery management system comprises a BMS battery management system main control module, a voltage stabilizing circuit starting module and a battery module, wherein the BMS battery management system main control module is used for analyzing battery parameter information collected by the BMS battery management system slave modules, outputting a current limiting protection starting instruction when the SOC of the battery assembly is lower than a preset SOC threshold value and a discharging current value is higher than a preset current threshold value, and outputting a voltage stabilizing circuit starting instruction when a single cell voltage value in the battery assembly is lower than a preset voltage threshold value;
the current limiting branch circuit is used for performing current limiting protection on the battery assembly;
and the voltage stabilizing circuit is used for performing voltage stabilizing protection on the monomer battery cell lower than the preset voltage threshold.
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| CN115123018A (en) * | 2022-07-25 | 2022-09-30 | 潍柴动力股份有限公司 | Pure electric mode torque-limiting control method and device for vehicle, electronic equipment and medium |
| CN115303127A (en) * | 2022-07-18 | 2022-11-08 | 安徽易加能数字科技有限公司 | Protection method for preventing over-discharge of battery of mobile energy storage charging vehicle |
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