CN111355282A - Charging and discharging protection method and system for series battery pack - Google Patents
Charging and discharging protection method and system for series battery pack Download PDFInfo
- Publication number
- CN111355282A CN111355282A CN202010240289.XA CN202010240289A CN111355282A CN 111355282 A CN111355282 A CN 111355282A CN 202010240289 A CN202010240289 A CN 202010240289A CN 111355282 A CN111355282 A CN 111355282A
- Authority
- CN
- China
- Prior art keywords
- charging
- battery pack
- battery
- discharging
- series
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007599 discharging Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 75
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 239000000178 monomer Substances 0.000 description 36
- 238000005516 engineering process Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging and discharging protection method for a series battery pack, which comprises the following steps: s1: sampling the current of the series battery pack and the voltage of the single battery; s2: judging the capacity of each single battery of the series battery pack according to the sampling result of the step S1; s3: setting a battery capacity failure threshold; s4: when the single battery capacity reaches a battery capacity failure threshold value, the single battery reaching the failure threshold value is permanently bypassed. When the single battery in the series battery pack fails or the capacity is seriously attenuated, the damaged single battery can be effectively isolated, and the failure of the whole battery pack is avoided.
Description
Technical Field
The invention relates to the field of electronic technology and new energy, in particular to a charging and discharging protection method and system for a series battery pack.
Background
In recent years, with the rapid development of new energy and battery technologies, secondary batteries have been widely used in the fields from portable electronic products to new energy vehicles, photovoltaic energy storage, and the like, and commonly used secondary batteries include lead-acid batteries, nickel-metal hydride batteries, lithium batteries, and the like. Because the voltage of the single battery is low (for example, the lead-acid battery is 2V, and the lithium battery is 3.7V), in actual use, in order to improve the output voltage, a plurality of battery monomers are required to be connected in series to form a series battery pack.
The capacity of the series battery pack depends on the single battery with the lowest capacity in the battery pack, and if the capacity of a certain single battery in the battery pack is reduced, the reduction of the whole capacity of the battery pack is brought; especially, if a single battery in the battery pack fails first, the battery pack is caused to fail integrally, and the safety and the service life of the battery pack are seriously affected. In order to protect the series battery pack and avoid the large difference of the performances of each single battery in the battery pack, the equalization technology is generally adopted at present. The equalization technology utilizes the electronic technology to keep the voltage deviation of the battery cells within an expected range, thereby ensuring that each battery cell keeps the same state in normal use.
Battery equalization is generally classified into passive equalization and active equalization. The passive equalization has the advantages of low cost and simple circuit design, but has the defects of poor effect and large loss; the active equalization has the advantages of high efficiency and small energy loss, but the circuit is complex and the cost is high. The equalization technology can only avoid the unbalance of the battery, once the capacity of the individual monomer in the battery pack is reduced, the capacity of the battery pack is determined by the monomer with the lowest capacity, and the equalization technology is difficult to play a role; particularly, in the case of the failure or the serious reduction of the capacity of the single battery, the battery pack is in a state of being full at once and being exhausted at once, and can only be scrapped.
The comparison document CN102545332B discloses a method and a system for balancing the electric quantity of a single battery, which realize charging and discharging of a single battery with minimum capacity to a single battery with maximum capacity at the same time by calculating the residual electric quantity of the single battery and a bidirectional isolation direct current conversion circuit, so as to achieve the purpose of balancing all the single batteries of a series battery pack, but when the whole capacity of the series battery pack is affected by the condition that the single battery of the series battery pack is invalid or the capacity is seriously reduced, the scheme of the comparison document fails to provide a solution to the problem.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the charge-discharge protection method and the charge-discharge protection system for the series battery pack aim to solve the problem of keeping the capacity of the series battery pack balanced when the single battery fails or the capacity is seriously reduced.
The invention is realized by the following technical scheme:
a charging and discharging protection method for a series battery pack comprises the following steps: s1: sampling the current of the series battery pack and the voltage of the single battery; s2: judging the capacity of each single battery of the series battery pack according to the sampling result of the step S1; s3: setting a battery capacity failure threshold; s4: when the single battery capacity reaches a battery capacity failure threshold value, the single battery reaching the failure threshold value is permanently bypassed.
And comparing the sampled single battery capacity with a preset battery capacity failure threshold value, and further knowing whether the single battery in the series battery pack is failed or whether the capacity of the single battery in the series battery pack is seriously reduced. When the single battery in the series battery pack reaches a preset battery capacity failure threshold, the single battery reaching the failure threshold is permanently fallen, namely the single battery reaching the failure threshold is removed from the series battery pack, so that the capacity of the series battery pack is not influenced by the failed single battery any more.
Further, setting a difference threshold value, and when the capacity difference of the single batteries is smaller than the difference threshold value, carrying out normal charging or normal discharging; and when the capacity difference of the single batteries is larger than a difference threshold value, performing single supplementary charging or complete discharging.
Further, the normal charging includes the steps of: s31: all the single batteries of the series battery pack are connected in series; s32: sampling the current of the series battery pack and the voltage of the single battery in real time; s33: adjusting the charging voltage of the series battery pack according to the sampling result of the step S32; s34: when any single battery reaches a charging threshold value, bypassing the single battery reaching the charging threshold value; s35: and repeating the steps S32-S35 until all the single batteries of the series battery pack reach the charging threshold value, and finishing charging. Whether the single batteries of the series battery pack are fully charged or not is judged one by one so as to ensure that all the single batteries in the series battery pack are fully charged and achieve the aim of balancing.
Further, the normal discharge includes the steps of: s41: all the single batteries of the series battery pack are connected in series; s42: sampling the current of the series battery pack and the voltage of the single battery in real time; s43: adjusting the discharge voltage externally output by the series battery pack according to the sampling result of the step S42; s44: and repeating the steps S42-S44, and finishing the discharge when the discharge of any single battery reaches the discharge threshold.
Further, according to the sampling result in step S1, a battery normal capacity threshold is set, a single battery with a single battery capacity greater than the battery normal capacity threshold is defined as a normal capacity battery, a single battery with a single battery capacity less than the battery normal capacity threshold is defined as an abnormal capacity battery, and the monomer supplementary charging includes the following steps: s51: bypassing the normal capacity cell; s52: sampling the current of the series battery pack and the voltage of the single battery in real time; s53: adjusting the charging voltage of the series battery pack according to the sampling result of the step S52; s54: defining the abnormal capacity battery as a normal capacity battery when the abnormal capacity battery reaches a charging threshold or reaches a normal capacity threshold; s55: the steps S51-S55 are repeated until all the abnormal capacity batteries reach the charging threshold or reach the normal capacity.
Further, the full discharge comprises the steps of: s61: all the single batteries of the series battery pack are connected in series; s62: sampling the current of the series battery pack and the voltage of the single battery in real time; s63: adjusting the discharge voltage externally output to the series battery pack according to the sampling result of the step S62; s64: when any single battery discharges and reaches a discharge threshold value, bypassing the single battery reaching the discharge threshold value; s65: and repeating the steps S62-S65 until all the single batteries of the series battery pack reach a discharge threshold value, and finishing the discharge.
A series battery pack charge-discharge protection system comprises a single voltage sampling module, a current sampling module, a charge-discharge module, an electronic switch group, a charge/discharge change-over switch and a control module, wherein the series battery pack, the current sampling module, the charge/discharge change-over switch and the charge-discharge module are sequentially connected to form a closed signal loop; the current sampling module is used for sampling the current of the series battery pack; the charging/discharging switching switch is arranged between the charging and discharging module and the current sampling module and is used for switching charging or discharging of the series battery pack; the electronic switch group comprises a plurality of electronic switches and is used for connecting the single batteries in the series battery group in series or bypassing the single batteries; the control module is used for controlling the closing of any electronic switch of the electronic switch group, the closing of the charging/discharging change-over switch, the charging voltage current of the charging and discharging module and the output voltage current of the charging and discharging module; the control module is used for receiving the voltage signal sampled by the single voltage sampling module and the current signal sampled by the current sampling module; the control module is used for judging whether the single batteries in the series battery pack are invalid or not and permanently dropping the invalid single batteries.
Furthermore, the electronic switch of the electronic switch group and the charge/discharge change-over switch are both single-pole double-throw switches.
Further, the charging and discharging module comprises a charging DC-DC and a discharging DC-DC.
Further, the charging and discharging protection circuit comprises a charging and discharging protection circuit of the series battery pack, wherein the charging and discharging protection circuit of the series battery pack comprises a single voltage sampling circuit, a series battery pack consisting of a plurality of single batteries, a plurality of electronic switches, a current sampling circuit, a control circuit, a charging/discharging switch, a discharging DC-DC circuit and a charging DC-DC circuit, the electronic switches are used for connecting the one or more single batteries in series or bypassing, the positive pole of the series battery pack is connected with the current sampling circuit, the current sampling circuit is connected with the charging/discharging switch, the charging/discharging switch is connected with the positive pole of the discharging DC-DC circuit and the positive pole of the charging DC-DC circuit, the negative pole of the discharging DC-DC circuit, the negative pole of the charging DC-DC circuit and the negative pole of the series battery pack are connected, the single voltage sampling circuit is used for sampling the single battery voltage of the series battery pack, the single voltage sampling circuit is connected with the series battery pack, and the control circuit is connected with the single voltage sampling circuit, the electronic switches, the current sampling circuit, the charging/discharging switch, the discharging DC-DC circuit and the charging DC-DC circuit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. any one or more monomers in the series battery pack can be charged/discharged, each monomer of the battery pack can be fully charged and emptied, and the battery capacity is increased;
2. when the single body in the battery pack fails or the capacity is seriously attenuated, the single body can be effectively isolated and damaged, and the failure of the whole battery pack is avoided;
3. when the monomer capacity in the battery pack has larger difference, the invention can effectively utilize the energy of the whole battery pack and avoid the limitation of the whole battery pack to the monomer with the smallest capacity;
4. the lagging monomer can be subjected to supplementary charging, and the effect similar to that of the existing balancing technology is achieved;
5. and passive energy consumption elements are not arranged, so that the energy loss is small and the efficiency is high.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a circuit structure diagram of the present embodiment;
fig. 2 is a flowchart of the operation process of the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in the circuit structure diagram of fig. 1, the battery 1 to the battery n are n battery cells, and each cell may be a battery or a parallel connection of a plurality of same batteries. SW1-SWn are electronic switches that are controlled single pole double throw switches. One static contact of the switch is connected with the anode of the battery pack, the other static contact of the switch is connected with the cathode of the battery pack, and the moving contact of the switch is connected with the cathode of the last battery pack (if the battery corresponding to the switch is the first battery of the anode of the battery pack, the moving contact of the switch is the anode output of the battery pack).
The battery pack is connected with the discharging DC-DC circuit or the charging DC-DC circuit and is switched by a charging/discharging switch controlled by the control circuit. The DC-DC discharging circuit has its input connected to the battery pack and output connected to the external load, and features that when the voltage of the battery pack changes greatly, the voltage output to the load may be maintained unchanged and the output voltage and current may be regulated by the control circuit. The input end of the charging DC-DC circuit is connected with an external charging input, and the output end of the charging DC-DC circuit is connected with the battery pack.
The circuit is provided with a single voltage sampling circuit for sampling the single voltage of each battery; a current sampling circuit is provided to sample the current flowing through the entire battery pack. And voltage sampling and current sampling information is sent to the control circuit. The control circuit outputs SW1-SWn electronic switch control signals, a discharging DC-DC output voltage, a current control signal, a charging DC-DC charging voltage, a current control signal, and a charge/discharge switching control signal.
In the working process of this embodiment, as shown in fig. 2, charging/discharging is started, and the control circuit controls the battery pack to enter the following flow according to the state of the battery pack and the charging/discharging requirement. The judgment source of the battery pack state is the current value or the historical value of the parameters such as the monomer voltage, the capacity, the internal resistance, the temperature and the like acquired by the control circuit.
1. Normal charging: the applicable conditions are as follows: the parameter difference of each monomer in the battery pack is very small, and the capacity basically has no attenuation
The control circuit controls the SW1-SWn electronic switches to enable the battery monomers to be in a series connection state, adjusts the charging limiting voltage of the charging DC-DC to the charging voltage corresponding to the whole battery pack (for example, n x Vi, Vi is the charging limiting voltage of the battery monomers, and n is the number of the battery monomers), controls the charging/discharging switching switch to be switched to the charging state, and charges the whole battery pack according to the charging strategy (such as a constant voltage current limiting method) most suitable for the battery pack. In the charging process, the control circuit monitors the single voltages and the current of the battery pack in real time through the single voltage sampling circuit and the current sampling circuit. When the control circuit judges that a certain single battery reaches a charging threshold value (for example, the voltage reaches a charging cut-off voltage) according to the voltage of the single battery and the current of the battery pack, the control circuit controls the electronic switch corresponding to the single battery to bypass the single battery, controls the output charging voltage of the charging DC-DC to be adjusted to (n-1) × Vi, and continues to charge the battery pack until all the single batteries are fully charged.
2. Monomer supplementary charging: the applicable conditions are as follows: one or more single cells in the battery pack are lagged and have lower voltage than other single cells
The control circuit controls the SW1-SWn electronic switch to bypass the normal monomer, only charges the lagging monomer, controls the charging limiting voltage of the charging DC-DC to be the charging voltage corresponding to the monomer to be charged (for example, m, Vi is the charging limiting voltage of the battery monomer, m is the number of the monomer to be charged), controls the charging/discharging switch to be switched to the charging state, and charges the whole battery according to the charging strategy (for example, constant voltage current limiting method) most suitable for the battery pack. In the charging process, the control circuit monitors the single voltages and the current of the battery pack in real time through the single voltage sampling circuit and the current sampling circuit. When the lagging cell is full or its voltage is the same as that of the normal cell, the boost charging is completed.
3. Normal discharge: the applicable conditions are as follows: the parameter difference of each monomer in the battery pack is very small, and the capacity basically has no attenuation
The control circuit controls the SW1-SWn electronic switches to enable the battery monomers to be in a series connection state, the charge/discharge switching switch is controlled to be switched to a discharge state, and the battery supplies power to an external load through the discharge DC-DC. In the discharging process, the control circuit monitors the monomer voltages and the battery pack current in real time through the monomer voltage sampling circuit and the current sampling circuit. When the control circuit judges that a certain single battery reaches a discharge threshold (for example, the voltage reaches a discharge cut-off voltage) according to the voltage of the single battery and the current of the battery pack, the discharge is stopped.
4. And (3) complete discharge: the applicable conditions are as follows: the difference between the monomers is large, and the attenuation of the individual monomers is obvious; or the whole battery is completely discharged in maintenance mode to eliminate memory effect and recalibrate capacity
The control circuit controls the SW1-SWn electronic switches to enable the battery monomers to be in a series connection state, the charging/discharging switching switch is switched to a discharging state, and the battery supplies power to an external load through discharging DC-DC. In the discharging process, the control circuit monitors the monomer voltages and the battery pack current in real time through the monomer voltage sampling circuit and the current sampling circuit. When the control circuit judges that a certain single battery reaches a discharging threshold value (for example, the voltage reaches a discharging cut-off voltage) according to the voltage of the single battery and the current of the battery pack, the control circuit controls the SW electronic switch corresponding to the single battery to bypass the single battery, and the rest single batteries continue to discharge until all the single batteries reach the discharging threshold value, and the discharging is stopped. Because the discharging DC-DC has the voltage stabilizing characteristic, the voltage output to the load can be kept unchanged when the voltage of the battery pack is greatly changed. Preferably, after one or more cells of the battery pack reach the discharge threshold and are bypassed, the control circuit controls the discharge DC-DC to reduce the voltage and current output to the load so as to protect the remaining batteries participating in the discharge.
5. Monomer failure charge/discharge: the applicable conditions are as follows: monomer failure or severe capacity drop
The control circuit controls the SW1-SWn electronic switch to enable the failed monomer to bypass permanently, controls the output charging voltage of the charging DC-DC to be the charging voltage of the battery pack after the failed monomer is removed (for example, (n-k) × Vi, Vi is the charging limiting voltage of the battery monomer, k is the number of the failed monomer, and n is the total number of the battery monomer), and carries out charging/discharging processes on the rest batteries.
The bypass is short circuit in the invention, which means that the anode and the cathode of the single battery are directly connected.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A charging and discharging protection method for a series battery pack is characterized by comprising the following steps:
s1: sampling the current of the series battery pack and the voltage of the single battery;
s2: judging the capacity of each single battery of the series battery pack according to the sampling result of the step S1;
s3: setting a battery capacity failure threshold;
s4: when the single battery capacity reaches a battery capacity failure threshold value, the single battery reaching the failure threshold value is permanently bypassed.
2. The series battery pack charge-discharge protection method according to claim 1, wherein a difference threshold is set, and when the capacity difference of the single batteries is smaller than the difference threshold, normal charge or normal discharge is performed; and when the capacity difference of the single batteries is larger than a difference threshold value, performing single supplementary charging or complete discharging.
3. The series battery charge-discharge protection method according to claim 2, wherein the normal charging includes the steps of:
s31: all the single batteries of the series battery pack are connected in series;
s32: sampling the current of the series battery pack and the voltage of the single battery in real time;
s33: adjusting the charging voltage of the series battery pack according to the sampling result of the step S32;
s34: when any single battery reaches a charging threshold value, bypassing the single battery reaching the charging threshold value;
s35: and repeating the steps S32-S35 until all the single batteries of the series battery pack reach the charging threshold value, and finishing charging.
4. The series battery charge-discharge protection method according to claim 2, wherein the normal discharge includes the steps of:
s41: all the single batteries of the series battery pack are connected in series;
s42: sampling the current of the series battery pack and the voltage of the single battery in real time;
s43: adjusting the discharge voltage externally output by the series battery pack according to the sampling result of the step S42;
s44: and repeating the steps S42-S44, and finishing the discharge when the discharge of any single battery reaches the discharge threshold.
5. The series battery pack charging and discharging protection method according to claim 2, wherein a battery normal capacity threshold is set according to the sampling result of step S1, a single battery with a single battery capacity greater than the battery normal capacity threshold is defined as a normal capacity battery, a single battery with a single battery capacity less than the battery normal capacity threshold is defined as an abnormal capacity battery, and the single supplementary charging comprises the following steps:
s51: bypassing the normal capacity cell;
s52: sampling the current of the series battery pack and the voltage of the single battery in real time;
s53: adjusting the charging voltage of the series battery pack according to the sampling result of the step S52;
s54: defining the abnormal capacity battery as a normal capacity battery when the abnormal capacity battery reaches a charging threshold or reaches a normal capacity threshold;
s55: the steps S51-S55 are repeated until all the abnormal capacity batteries reach the charging threshold or reach the normal capacity.
6. The series battery charge-discharge protection method according to claim 2, wherein the full discharge comprises the steps of:
s61: all the single batteries of the series battery pack are connected in series;
s62: sampling the current of the series battery pack and the voltage of the single battery in real time;
s63: adjusting the discharge voltage externally output to the series battery pack according to the sampling result of the step S62;
s64: when any single battery discharges and reaches a discharge threshold value, bypassing the single battery reaching the discharge threshold value;
s65: and repeating the steps S62-S65 until all the single batteries of the series battery pack reach a discharge threshold value, and finishing the discharge.
7. A series battery pack charging and discharging protection system is characterized by comprising a single voltage sampling module, a current sampling module, a charging and discharging module, an electronic switch group, a charging/discharging change-over switch and a control module, wherein the series battery pack, the current sampling module, the charging/discharging change-over switch and the charging and discharging module are sequentially connected to form a closed signal loop, the control module is respectively connected with the single voltage sampling module, the current sampling module, the electronic switch group, the charging/discharging change-over switch and the charging and discharging module,
the single voltage sampling module is connected with the series battery pack and is used for sampling the voltage of the single battery in the series battery pack;
the current sampling module is used for sampling the current of the series battery pack;
the charging/discharging switching switch is arranged between the charging and discharging module and the current sampling module and is used for switching charging or discharging of the series battery pack;
the electronic switch group comprises a plurality of electronic switches and is used for connecting the single batteries in the series battery group in series or bypassing the single batteries;
the control module is used for controlling the closing of any electronic switch of the electronic switch group, the closing of the charging/discharging change-over switch, the charging voltage current of the charging and discharging module and the output voltage current of the charging and discharging module;
the control module is used for receiving the voltage signal sampled by the single voltage sampling module and the current signal sampled by the current sampling module;
the control module is used for judging whether the single batteries in the series battery pack are invalid or not and permanently dropping the invalid single batteries.
8. The series battery charge-discharge protection system of claim 7, wherein the electronic switch of the electronic switch bank and the charge/discharge switcher are single-pole double-throw switches.
9. The series battery charge-discharge protection system of claim 8, wherein the charge-discharge module comprises a charging DC-DC and a discharging DC-DC.
10. The series battery charging and discharging protection system according to claim 9, comprising a series battery charging and discharging protection circuit, wherein the series battery charging and discharging protection circuit comprises a single voltage sampling circuit, a series battery composed of a plurality of single batteries, a plurality of electronic switches for connecting the one or more single batteries in series or in bypass, a current sampling circuit, a control circuit, a charging/discharging switch, a discharging DC-DC circuit and a charging DC-DC circuit, wherein the positive electrode of the series battery is connected to the current sampling circuit, the current sampling circuit is connected to the charging/discharging switch, the charging/discharging switch is connected to the discharging DC-DC circuit positive electrode and the charging DC-DC circuit positive electrode, the discharging DC-DC circuit negative electrode, the charging DC-DC circuit, and the discharging DC-DC circuit, The negative pole of the charging DC-DC circuit is connected with the negative pole of the series battery pack, the single voltage sampling circuit is used for sampling the single battery voltage of the series battery pack, the single voltage sampling circuit is connected with the series battery pack, and the control circuit is connected with the single voltage sampling circuit, the electronic switches, the current sampling circuit, the charging/discharging switch, the discharging DC-DC circuit and the charging DC-DC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240289.XA CN111355282A (en) | 2020-03-30 | 2020-03-30 | Charging and discharging protection method and system for series battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010240289.XA CN111355282A (en) | 2020-03-30 | 2020-03-30 | Charging and discharging protection method and system for series battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111355282A true CN111355282A (en) | 2020-06-30 |
Family
ID=71197551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010240289.XA Pending CN111355282A (en) | 2020-03-30 | 2020-03-30 | Charging and discharging protection method and system for series battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111355282A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260359A (en) * | 2020-08-27 | 2021-01-22 | 江苏博强新能源科技股份有限公司 | BMS control method, system, electronic equipment and storage medium |
| WO2021047361A1 (en) * | 2019-09-12 | 2021-03-18 | 展讯通信（深圳）有限公司 | Control apparatus and electronic device |
| CN112701747A (en) * | 2020-12-16 | 2021-04-23 | 格力电器（武汉）有限公司 | Battery pack structure, battery system and control method thereof |
| CN113315207A (en) * | 2021-06-15 | 2021-08-27 | 江苏大学 | Shunting type balanced charge-discharge protection method and system based on lithium ion battery |
| CN114047451A (en) * | 2021-12-21 | 2022-02-15 | 杭州义益钛迪信息技术有限公司 | Storage battery state identification method and device |
| WO2024140359A1 (en) * | 2022-12-31 | 2024-07-04 | 双澳储能科技（西安）有限公司 | Method and system for obtaining capacities of battery cells in series battery pack |
| WO2024199183A1 (en) * | 2023-03-29 | 2024-10-03 | 博雷顿科技股份公司 | Method and system for controlling battery inconsistency |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560554A (en) * | 2013-10-30 | 2014-02-05 | 北京海博思创科技有限公司 | Electric quantity balancer for battery pack |
| CN103647310A (en) * | 2013-11-20 | 2014-03-19 | 上海交通大学 | Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules |
| CN103647316A (en) * | 2013-12-03 | 2014-03-19 | 深圳市雅格朗电子有限公司 | Serially-connected lithium battery set power supply equalization management system |
| CN104253469A (en) * | 2014-09-24 | 2014-12-31 | 于志章 | Secondary battery pack charging and discharging management system |
| CN106130132A (en) * | 2016-08-18 | 2016-11-16 | 郑州宇通客车股份有限公司 | Charging protection circuit for storage battery and use battery system and the motor vehicles of this circuit |
| CN106786971A (en) * | 2017-01-20 | 2017-05-31 | 厦门大学 | Lithium battery management system and its control strategy based on half-bridge series connection |
| CN109038712A (en) * | 2018-07-18 | 2018-12-18 | 华中科技大学 | A kind of liquid metal cell group balance control method and tolerant system |
| CN211530808U (en) * | 2020-03-30 | 2020-09-18 | 中国电建集团成都勘测设计研究院有限公司 | Charging and discharging protection system for series battery pack |
-
2020
- 2020-03-30 CN CN202010240289.XA patent/CN111355282A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560554A (en) * | 2013-10-30 | 2014-02-05 | 北京海博思创科技有限公司 | Electric quantity balancer for battery pack |
| CN103647310A (en) * | 2013-11-20 | 2014-03-19 | 上海交通大学 | Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules |
| CN103647316A (en) * | 2013-12-03 | 2014-03-19 | 深圳市雅格朗电子有限公司 | Serially-connected lithium battery set power supply equalization management system |
| CN104253469A (en) * | 2014-09-24 | 2014-12-31 | 于志章 | Secondary battery pack charging and discharging management system |
| CN106130132A (en) * | 2016-08-18 | 2016-11-16 | 郑州宇通客车股份有限公司 | Charging protection circuit for storage battery and use battery system and the motor vehicles of this circuit |
| CN106786971A (en) * | 2017-01-20 | 2017-05-31 | 厦门大学 | Lithium battery management system and its control strategy based on half-bridge series connection |
| CN109038712A (en) * | 2018-07-18 | 2018-12-18 | 华中科技大学 | A kind of liquid metal cell group balance control method and tolerant system |
| CN211530808U (en) * | 2020-03-30 | 2020-09-18 | 中国电建集团成都勘测设计研究院有限公司 | Charging and discharging protection system for series battery pack |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021047361A1 (en) * | 2019-09-12 | 2021-03-18 | 展讯通信（深圳）有限公司 | Control apparatus and electronic device |
| CN112260359A (en) * | 2020-08-27 | 2021-01-22 | 江苏博强新能源科技股份有限公司 | BMS control method, system, electronic equipment and storage medium |
| CN112260359B (en) * | 2020-08-27 | 2024-01-09 | 江苏博强新能源科技股份有限公司 | BMS control method, system, electronic equipment and storage medium |
| CN112701747A (en) * | 2020-12-16 | 2021-04-23 | 格力电器（武汉）有限公司 | Battery pack structure, battery system and control method thereof |
| CN113315207A (en) * | 2021-06-15 | 2021-08-27 | 江苏大学 | Shunting type balanced charge-discharge protection method and system based on lithium ion battery |
| CN113315207B (en) * | 2021-06-15 | 2024-07-12 | 江苏大学 | Split-type balanced charge and discharge protection method and system based on lithium ion battery |
| CN114047451A (en) * | 2021-12-21 | 2022-02-15 | 杭州义益钛迪信息技术有限公司 | Storage battery state identification method and device |
| CN114047451B (en) * | 2021-12-21 | 2023-12-12 | 杭州义益钛迪信息技术有限公司 | Storage battery state identification method and device |
| WO2024140359A1 (en) * | 2022-12-31 | 2024-07-04 | 双澳储能科技（西安）有限公司 | Method and system for obtaining capacities of battery cells in series battery pack |
| WO2024199183A1 (en) * | 2023-03-29 | 2024-10-03 | 博雷顿科技股份公司 | Method and system for controlling battery inconsistency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211530808U (en) | Charging and discharging protection system for series battery pack | |
| CN111355282A (en) | Charging and discharging protection method and system for series battery pack | |
| CN110048487B (en) | Control method and system for battery charging and discharging | |
| CN112332486B (en) | Active equalizing charging system of battery pack and control method thereof | |
| CN107134599B (en) | Voltage equalization circuit of series battery pack and working method thereof | |
| CN109347173B (en) | Battery pack balance control circuit and method based on switched capacitor | |
| CN112737015A (en) | Lithium battery equalization control system and control method based on SOC | |
| CN107681733A (en) | Battery balanced module and distributed battery energy storage balancer | |
| CN102148521A (en) | Rechargeable battery pack equalizing device | |
| US20190131667A1 (en) | Battery charging apparatus and battery charging method | |
| CN114744699A (en) | Energy storage system parallel battery cluster circulation restraining device, method and medium | |
| CN110729795B (en) | Energy storage power station and battery balance control method thereof | |
| CN211296261U (en) | Active voltage equalization circuit for lithium battery series connection electric core | |
| CN113629822A (en) | Energy storage system and control method thereof | |
| CN118100369A (en) | Battery equalization system of distributed energy storage system | |
| CN216056382U (en) | Battery energy storage system | |
| KR102208016B1 (en) | Energy storage system having distributed batteries | |
| CN103036257A (en) | Equalizing circuit and method for single inductance type storage battery group | |
| CN202309119U (en) | Single inductance type storage battery equalizing circuit | |
| CN116760146A (en) | Active equalization circuit and method of battery pack | |
| JP5059674B2 (en) | Power supply system and charging method | |
| CN114759643A (en) | Be used for balanced equipment of lithium cell BMS | |
| CN112952939B (en) | Series battery pack and capacity balancing method thereof | |
| CN214154077U (en) | Automatic equalization discharge control device for series batteries | |
| CN218385365U (en) | Lead-acid battery new and old mixed use balance circuit structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |