CN108565914B - Battery pack cyclic charge and discharge system and method - Google Patents
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Abstract
A battery pack cyclic charge-discharge system and a method relate to the charge-discharge control technology of a storage battery. The problem of adopt the equilibrium technique still can't solve the inconsistent of unit single face among the current charge-discharge management system is solved. The charging and discharging method is to divide the charging and discharging process into a plurality of unit control periods, only n unit batteries are on-line in each period, and m units with the largest/smallest energy in the on-line unit batteries are replaced by m units with the smallest/largest energy in the off-line unit batteries when each period is finished until all the unit batteries are fully charged/emptied. The system comprises a switching control device for switching one or more appointed unit batteries into/out of a charging and discharging loop, a unit battery detection device for detecting unit battery parameters, and a charging and discharging control device for controlling the start/stop of a unit control cycle and controlling the switching control device to maintain that only n unit batteries are on-line in the unit control cycle according to the terminal voltage of the unit batteries. The invention is suitable for controlling the charging and discharging of the battery pack.
Description
Technical Field
The invention relates to a charge-discharge control technology of a storage battery, belonging to the technical field of storage battery control.
Background
As an electric energy storage device, since the voltage provided by the single storage battery is much less than the power supply voltage required by the load device, the storage battery must be connected in series and then used in the form of a battery pack. As shown in fig. 1
Because all the battery monomers in the storage battery pack adopt a direct series connection structure, the charging and discharging currents of the series battery monomers are completely the same, and all the battery monomers simultaneously realize the charging and discharging of the same current. Ideally, the voltages of the single batteries are equal, so that the charging and discharging voltages of the battery pack are the voltage of the single batteries and the number of the single batteries; however, in the actual usage environment, due to the manufacturing inconsistency of the battery cells and the usage environment, the characteristics of the battery cells, such as voltage, capacity and the like, are inconsistent, and during the normal charging and discharging usage process of the battery pack, the phenomena of overcharge or undercharge of part of the battery cells can occur. The single batteries are in an overcharged or undercharged state for a long time, so that on one hand, the inconsistency of the single batteries in the battery pack is aggravated, other normal single batteries are overcharged or undercharged, on the other hand, the problem of battery degradation gradually occurs, and finally, all batteries in the battery pack lose the capacity of storing electric energy.
Therefore, in the practical use of the battery pack, a user is required to replace all the batteries on time to ensure the electric energy storage capacity and the emergency power supply capacity of the battery pack, and once the deterioration or the failure of the single batteries is found, if the single batteries cannot be strictly and comprehensively detected and screened, and the replaceable batteries with high consistency with other batteries without deterioration or failure are replaced, all the single batteries in the same group must be replaced in the whole group, so that huge waste is generated.
In order to solve the problem of battery degradation caused by non-uniformity of the single batteries, so-called active (passive) equalization technology is mostly adopted at present, as shown in fig. 2, that is, a discharging load or a charging and discharging device is connected in parallel on a single battery to perform small-capacity charging and discharging of the single battery on the basis of charging and discharging of a conventional battery pack, so as to adjust the uniformity of voltage or capacity of the single battery in the battery pack, and achieve the effect of maintaining the battery. The external equalizing device is connected to the battery monomer in a parallel mode, and the original monomer series connection wiring mode of the battery pack is not changed. The cell balancing apparatus has a limited capacity due to cost realizability, and can adjust only a small capacity, so that the practical effect is extremely limited, and the effect of inconsistency due to battery manufacturing or battery deterioration is hardly obtained.
Disclosure of Invention
The invention solves the problem that the inconsistency caused by battery degradation cannot be effectively solved by adopting the equalization technology in the existing charge and discharge management system.
The invention relates to a battery pack cycle charging method, which is a time division charging method, wherein a charging object of the method is a battery pack consisting of n + x unit cells, and the charging method comprises the following steps: dividing the charging process into a plurality of unit charging control periods, wherein each unit charging control period is 0.1-2 minutes; in each unit charging control period, keeping n unit batteries online, and keeping the rest x unit batteries offline; and at the end of each unit charging control period, cutting off m unit batteries with the highest charged energy in the on-line unit batteries, selecting m unit batteries with the lowest charged energy from the x off-line unit batteries, switching into a charging loop, and starting the next unit charging control period until n + x unit batteries are fully charged to finish charging, wherein m is less than n and m is less than x.
The invention relates to a battery pack cyclic discharge method, which is a time division discharge method, wherein the discharge object of the method is a battery pack consisting of n + x unit cells, and the discharge method comprises the following steps: dividing the discharge process into a plurality of unit discharge control periods, wherein each discharge control period is 0.1-2 minutes; in each unit discharge control period, keeping n unit batteries online, and keeping the rest x unit batteries offline; and when each unit discharge control period is finished, cutting off m unit cells with the minimum energy in the online unit cells, selecting m unit cells with the maximum energy from the x offline unit cells, switching into a discharge loop, and starting the next unit discharge control period until n + x unit cells are emptied to finish discharge, wherein m is less than n and m is less than x.
The charging object of the battery pack circulating charging system is a battery pack consisting of n + x unit batteries, the battery pack circulating charging system comprises n + x switching switches, a unit battery detection device, a switching control device and a charging control device, and the switching control device is used for switching in or switching out one or more appointed unit batteries in a charging loop according to a switching instruction sent by the charging control device; the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack; the charging control device is used for controlling the starting and stopping of each unit charging control period in the charging process and generating switching instructions according to the parameters of the unit batteries detected by the unit battery detection device when each unit charging control period is finished; and the controller is also used for maintaining that only n unit batteries are positioned in the charging loop in each unit charging control period, the unit charging control period is between 0.1 and 2 minutes, and the interval time between every two adjacent unit charging control periods is less than 10 ms.
The discharge object of the battery pack cycle discharge system is the battery pack consisting of n + x unit cells, the battery pack cycle discharge system comprises n + x switching switches, unit cell detection devices, switching control devices and discharge control devices, wherein: the switching control device is used for switching one or more appointed unit batteries into or out of a discharging loop according to a switching instruction sent by the charging control device; the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack; the discharge control device is used for controlling the starting and stopping of each unit discharge control period in the discharge process and generating a switching instruction according to the parameters of the unit batteries detected by the unit battery detection device when each unit discharge control period is finished; and the controller is also used for maintaining that only n unit cells are positioned in the discharge loop in each unit discharge control period, wherein the unit discharge control period is between 0.1 and 2 minutes, and the interval time between two adjacent unit discharge control periods is less than 10 ms.
The unit cell is the minimum unit of the battery pack, can be a single cell, and can also be a small battery pack formed by connecting a plurality of single cells in series or in parallel.
The invention relates to a battery pack cyclic charge-discharge method, which adopts a time-division charge-discharge method to realize time-division control on a battery monomer, changes the existing continuous charge or discharge process into a plurality of small continuous processes with discontinuous fixed time lengths, completely abandons the concept of charge-discharge balance control of a storage battery, and takes full charge, empty discharge and no over-charge and over-discharge of a unit storage battery as a final charge-discharge control target instead of taking the consistency of the battery voltage as a control target, thereby finally realizing the storage capacity of the maximum electric energy and a safe and reliable use target of the battery pack in the use process.
Compared with the prior battery charging and discharging technology, the invention has the following advantages:
1. in the battery pack circulating charge/discharge management system and method, the unit batteries in the battery pack to be charged or discharged are not directly connected in series, but are connected in series through a controlled bidirectional switching switch, when the unit batteries in the battery pack are overcharged or overdischarged, the unit batteries are bypassed through the switching switch, and the other unit batteries are continuously charged/discharged, so that the phenomenon of overshoot or overdischarge of each unit battery in the charge/discharge process is effectively avoided, and simultaneously, each unit battery can be fully charged or emptied, and the performance of each unit battery is ensured to be in the optimal state.
2. The battery pack cyclic charge/discharge management system and the method completely abandon the design idea that each charge cycle needs to be continuous until full and each discharge cycle needs to be continuous until emptying in the existing battery pack charge-discharge method, but adopt the principle of short-time cyclic charge or discharge, namely: instead of using full or empty batteries as a charging or discharging cycle, the whole charging or discharging cycle is divided into several sub-cycles, namely: the unit control periods are controlled, and the charging loop or the discharging unit battery is continuously adjusted in the alternate process of the unit control periods, so that the unit battery with lower terminal voltage has longer online charging time, and the unit battery with higher terminal voltage has longer online discharging time, and each unit battery in the battery pack can be fully charged or emptied.
3. The battery pack circulating charge/discharge management system and the battery pack circulating charge/discharge management method change the original continuous charge/discharge process into a plurality of small periods, and the number of the on-line unit batteries in each small period is unchanged, so that the conventional fixed charge/discharge power supply can be adopted. In addition, the short pause between the small periods enables the adjustment of the on-line unit cells, namely: the total online charging time of the unit battery with lower voltage is longer in the charging process, so that the unit battery with lower voltage can be fully charged; the total online discharge time of the unit battery with higher voltage is longer in the discharge process, so that the unit battery with higher voltage can be emptied. The method can effectively ensure that all unit batteries in the battery pack are fully charged when charging is completed and are emptied when discharging is completed, thereby realizing the maximum storage capacity of each unit battery and further realizing the integral maximum storage capacity of the battery pack.
4. The invention relates to a battery pack circulating charge/discharge management system and a method, wherein two pauses exist in the charge/discharge process, for a single battery in a battery pack continuously charged/discharged in a plurality of periods, the original continuous charge/discharge process is changed into a plurality of small periods, the small periods are paused, and the pause time is less than 10 ms; for most single batteries, the charging and discharging process is a real charging/discharging process which is composed of a group of online and offline charging/discharging and stopping processes with a small period as a unit, the single batteries have pause with the small period as a time unit in the charging/discharging process, and tests prove that the pause does not influence the chemical reaction of charging/discharging, and on the contrary, the short pause is more beneficial to ensuring that the chemical reaction in the batteries has small buffer, and the buffer is more beneficial to fully carrying out the chemical reaction, so that the effects of shortening the whole charging period or discharging period and saving energy are achieved.
The present invention is applicable to improvements in existing battery charge/discharge technology.
Drawings
Fig. 1 is a schematic block diagram of a conventional battery pack cyclic charge and discharge management system.
Fig. 2 is a schematic block diagram of a battery pack cyclic charge and discharge management system with equalization technology in the prior art.
Fig. 3 is a schematic block diagram of a battery cycling charge/discharge management system according to the present invention.
Fig. 4 is a schematic circuit diagram of the fling-cut switch K shown in fig. 3.
Detailed description of the preferred embodiments
In a first embodiment, a charging target of the battery pack cycle charging method according to this embodiment is a battery pack including n + x unit cells, and the charging method includes: dividing the charging process into a plurality of unit charging control periods, wherein each unit charging control period is 0.1-2 minutes; in each unit charging control period, keeping n unit batteries online, and keeping the rest x unit batteries offline; and at the end of each unit charging control period, cutting off m unit batteries with the highest charged energy in the on-line unit batteries, selecting m unit batteries with the lowest charged energy from the x off-line unit batteries, switching into a charging loop, and starting the next unit charging control period until n + x unit batteries are fully charged to finish charging, wherein m is less than n and m is less than x.
In the present embodiment, before the first unit charge control cycle is started, the n unit cells having the smallest terminal voltages among all the n + x unit cells are switched into the charge circuit, and then the first unit charge control cycle is started.
In the present embodiment, the emphasis on the charging target is a battery pack consisting of n + x unit cells, and the purpose is to facilitate description that n unit cells are always online and x unit cells are always offline during the charging process.
The interval time between adjacent two unit charge control cycles in the present embodiment is less than 10 ms.
In the present embodiment, the time periods of the plurality of unit charge control cycles may be the same or different.
For different cases, this may be: the time per unit charge control period is gradually reduced.
In the charging method according to the embodiment, the original continuous charging process is divided into a plurality of small unit charging control cycles, and the online charging unit batteries are adjusted according to the terminal voltage conditions of all the unit batteries when the charging control cycles are switched, so that the unit batteries with lower terminal voltages have longer online charging time, and the control rule is maintained before all the batteries are fully charged. In the whole charging process, only n unit batteries are arranged in the charging loop all the time, so that the charging voltage of the charging loop is a fixed value, namely: the existing charging power supply is adopted.
In a second embodiment, a discharge object of the battery pack cycle discharge method according to this embodiment is a battery pack including n + x unit cells, and the discharge method includes: dividing the discharge process into a plurality of unit discharge control periods, wherein each discharge control period is 0.1-2 minutes; in each unit discharge control period, keeping n unit batteries online, and keeping the rest x unit batteries offline; and when each unit discharge control period is finished, cutting off m unit cells with the minimum energy in the online unit cells, selecting m unit cells with the maximum energy from the x offline unit cells, switching into a discharge loop, and starting the next unit discharge control period until n + x unit cells are emptied to finish discharge, wherein m is less than n and m is less than x.
In the present embodiment, before the first unit discharge control period is started, the n unit cells having the largest terminal voltages among all the n + x unit cells are switched into the discharge circuit, and then the first unit discharge control period is started.
The interval time between adjacent two unit charge control cycles in the present embodiment is less than 10 ms.
In the present embodiment, the time periods of the plurality of unit discharge control periods may be the same or different.
For different cases, this may be: the time of the unit discharge control period is gradually reduced.
The discharging method described in this embodiment cuts the original continuous discharging process into several small unit discharging control periods, and adjusts the unit cells that are discharged online according to the terminal voltage conditions of all the unit cells when the discharging control periods are switched, so that the unit cells with higher terminal voltages have longer online discharging time, and the control law is maintained before the whole cells are emptied. In the whole discharging process, only n unit cells are always arranged in the charging loop, so that the discharging voltage of the charging loop is a fixed value, namely: the existing discharge power supply is adopted.
The specific selection of the charge control period and the discharge period described in the first and second embodiments is determined according to the kind of the battery in practical application. Generally, the principle that the single battery in the battery pack keeps the voltage of the battery terminal basically unchanged in the most proper charging current range during the charging and discharging process is considered when selecting, and particularly, the voltage of the battery terminal is ensured to be kept stable in a control period determined by the time during which the voltage of the battery terminal changes at a high speed in the initial and end stages of charging and discharging.
The interval time described in embodiments one and two is less than 10ms, which is generally determined by the hardware characteristics of the execution circuitry that implements the switching. For example, when an electronic switch circuit commonly used in the prior art is selected as a switching switch, the interval time is the cut-off start of a bypass electronic switch, the cut-off is completed, the switching switch controls a dead zone, the battery circuit switch is switched on, and the battery circuit switch is switched on and off, the whole process needs to consider the establishment and cut-off speed of the battery charging and discharging current, namely the gradient of the current from 0 to the charging and discharging current change, the gradient is determined by the current impact resistance of equipment and a battery, and the experimental result is generally suitable for 1 to 10 ms.
The time of the unit charge control period and the unit discharge control period described in the first and second embodiments is different, and generally, the time is gradually reduced. In practical application, when the voltage of the battery changes rapidly in the first and last stages of charging and discharging, if the control period cannot ensure that the voltage in the period is basically unchanged, the control period can be adjusted within the range of 1 to 0.1 times of the basic control period to adjust the control period.
In a third specific embodiment, the present embodiment is described with reference to fig. 3, where a charging target of the battery pack cyclic charging system in the present embodiment is a battery pack composed of n + x unit cells, the battery pack cyclic charging system includes n + x switching switches, a unit cell detection device, a switching control device, and a charging control device, and the switching control device is configured to switch one or more specified unit cells into or out of a charging loop according to a switching instruction sent by the charging control device; the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack; the charging control device is used for controlling the starting and stopping of each unit charging control period in the charging process and generating switching instructions according to the parameters of the unit batteries detected by the unit battery detection device when each unit charging control period is finished; and the controller is also used for maintaining that only n unit batteries are positioned in the charging loop in each unit charging control period, the unit charging control period is between 0.1 and 2 minutes, and the interval time between every two adjacent unit charging control periods is less than 10 ms.
In this embodiment, the charging control device includes a control unit, a data analysis unit, and a switching instruction generation unit, where: the control unit is used for generating a charging starting instruction to the switching instruction generating unit; the data analysis unit is also used for starting the data analysis unit when each unit charging control cycle is finished after the charging starting command is sent out; the charging stopping device is also used for generating a charging stopping instruction to the switching instruction generating unit according to the information fed back by the data analyzing unit; the data analysis unit is used for analyzing all the parameters of the unit batteries detected and obtained by the unit battery detection device and generating switching information to the switching instruction generation unit or generating all full-charging information to the control unit according to the analysis result; the switching instruction generating unit is used for generating a starting switching instruction to the switching control device when a charging starting instruction is received, wherein the starting switching instruction comprises 'switching-in' and the serial numbers of the n unit batteries; the switching control device is also used for generating switching instructions to the switching control device according to switching information sent by the data analysis unit, wherein the switching instructions comprise serial numbers of 'switching in' and m unit batteries, 'switching off' and serial numbers of m unit batteries; and the switching control device is also used for generating a cutting-off instruction to the switching control device according to the charging stopping instruction, wherein the cutting-off instruction comprises the sequence numbers of all the unit batteries which are cut off and positioned in the charging loop.
In this embodiment, the data analysis unit for analyzing the parameters of all the unit cells detected by the unit cell detection device is configured to: judging the terminal voltage of each n + x unit cells, and if the terminal voltages are in full charge state, generating full charge information; otherwise, sorting the parameters of the n unit batteries in the charging loop, combining the serial numbers of the m unit batteries with the cut voltages from large to small, and adding switching information; and (3) sorting the parameters of the x unit batteries outside the charging loop, and combining the serial numbers of the m unit batteries with the voltages from small to large and the 'cut-in' into the switching information to form final switching information.
In a fourth embodiment, the present embodiment is described with reference to fig. 3, a discharging object of the battery cycling discharging system of the present embodiment is a battery pack composed of n + x unit cells, the battery cycling discharging system includes n + x switching switches, unit cell detecting devices, switching control devices, and discharging control devices, where: the switching control device is used for switching one or more appointed unit batteries into or out of a discharging loop according to a switching instruction sent by the charging control device; the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack; the discharge control device is used for controlling the starting and stopping of each unit discharge control period in the discharge process and generating a switching instruction according to the parameters of the unit batteries detected by the unit battery detection device when each unit discharge control period is finished; and the controller is also used for maintaining that only n unit cells are positioned in the discharge loop in each unit discharge control period, wherein the unit discharge control period is between 0.1 and 2 minutes, and the interval time between two adjacent unit discharge control periods is less than 10 ms.
In this embodiment, the discharge control device includes a control unit, a data analysis unit, and a switching instruction generation unit, where: the control unit is used for generating a starting discharge instruction to the switching instruction generating unit; the data analysis unit is also used for starting the data analysis unit when each unit discharge control period is finished after the discharge starting command is sent out; the switching instruction generating unit is used for generating a switching instruction according to the information fed back by the data analyzing unit; the data analysis unit is used for analyzing the parameters of all the unit batteries detected and obtained by the unit battery detection device and generating switching information to the switching instruction generation unit or generating all emptying information to the control unit according to the analysis result; the switching command generating unit is used for generating a starting switching command to the switching control device when receiving a starting discharging command, wherein the starting switching command comprises 'switching-in' and the serial numbers of the n unit batteries; the switching control device is also used for generating switching instructions to the switching control device according to switching information sent by the data analysis unit, wherein the switching instructions comprise serial numbers of 'switching in' and m unit batteries, 'switching off' and serial numbers of m unit batteries; and the cutting-off instruction is also used for generating a cutting-off instruction to the switching control device according to the discharging stopping instruction, wherein the cutting-off instruction comprises the sequence numbers of all the unit batteries which are cut off and positioned in the discharging loop.
The data analysis unit is used for analyzing the parameters of all the unit batteries detected and obtained by the unit battery detection device, and the data analysis unit is used for: judging the terminal voltage of each n + x unit cells, and if the terminal voltages are all in a venting state, generating all venting information; otherwise, sorting the parameters of the n unit batteries in the discharge loop, combining the serial numbers of the m unit batteries with the cut-off voltage from small to large, and adding switching information; and (3) sorting the parameters of the x unit batteries outside the discharge loop, and combining the serial numbers of the m unit batteries with the voltages from large to small and the 'cut-in' into the switching information to form final switching information.
The fling-cut switch is a bidirectional fling-cut switch capable of realizing automatic control, and can be realized by selecting the existing electronic bidirectional fling-cut switch. For example: referring to fig. 4, the implementation can be realized by using mosfet power devices, and the specific switch shown in fig. 4 includes two mosfet power devices T1 and T2 and a zener diode D1, where the zener diode D1 is used to connect the switching switch connection unit cells in parallel, one mosfet power device is used as a switching-in switch, the other mosfet power device is used as a cutting-off switch, and control signals of the two mosfet power devices T1 and T2 are opposite. In order to prevent the occurrence of the battery short-circuit discharge phenomenon caused by instantaneous simultaneous conduction, a dead zone control mode is adopted between the control signals of the two mosfet power devices T1 and T2.
The mosfet power devices T1 and T2 are both mosfet power devices including antiparallel diodes. The switching speed of the switching switch is high and can reach microsecond level, so that the switching-in or cutting-off action of the unit battery at each time can not influence the charging or discharging process, and the phenomenon of instantaneous disconnection of the battery pack in series connection is avoided.
Claims (6)
1. The battery pack circulation charging method is characterized in that the charging object is a battery pack consisting of n + x unit cells, the unit cells in the battery pack are connected in series by a controlled bidirectional switching switch instead of a direct series connection mode, and the charging method comprises the following steps:
dividing the charging process into a plurality of unit charging control periods, wherein each unit charging control period is 0.1-2 minutes; the interval time between two adjacent unit charging control periods is less than 10 ms;
in each unit charging control period, keeping n unit batteries online, and keeping the rest x unit batteries offline;
and at the end of each unit charging control period, cutting off m unit batteries with the highest charged energy in the on-line unit batteries, selecting m unit batteries with the lowest charged energy from the x off-line unit batteries, switching into a charging loop, and starting the next unit charging control period until n + x unit batteries are fully charged to finish charging, wherein m is less than n and m is less than x.
2. The battery pack cyclic charging method of claim 1, wherein n unit cells having the smallest terminal voltage among all the n + x unit cells are switched into the charging loop before a first unit charge control period is started, and then the first unit charge control period is started.
3. The battery pack cyclic discharge method is characterized in that a discharge object is a battery pack consisting of n + x unit cells, the unit cells in the battery pack are connected in series by a controlled bidirectional switching switch instead of a direct series connection mode, and the discharge method comprises the following steps:
dividing the discharge process into a plurality of unit discharge control periods, wherein each discharge control period is 0.1-2 minutes; the interval time between two adjacent unit discharge control periods is less than 10 ms;
in each unit discharge control period, keeping n unit batteries online, and keeping the rest x unit batteries offline;
and when each unit discharge control period is finished, cutting off m unit cells with the minimum energy in the online unit cells, selecting m unit cells with the maximum energy from the x offline unit cells, switching into a discharge loop, and starting the next unit discharge control period until n + x unit cells are emptied to finish discharge, wherein m is less than n and m is less than x.
4. The battery pack cycle discharging method according to claim 3, wherein the n unit cells having the largest terminal voltage among all the n + x unit cells are cut into a discharging loop before a first unit discharge control period is started, and then the first unit discharge control period is started.
5. The battery pack circulating charging system is characterized in that a charging object of the battery pack circulating charging system is a battery pack consisting of n + x unit batteries, the battery pack circulating charging system comprises n + x fling-cut switches, unit battery detection devices, fling-cut control devices and charging control devices, and the fling-cut switches are controlled bidirectional fling-cut switches, wherein:
the switching control device is used for switching one or more specified unit batteries into or out of a charging loop according to a switching instruction sent by the charging control device;
the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack;
the charging control device is used for controlling the starting and stopping of each unit charging control period in the charging process and generating switching instructions according to the parameters of the unit batteries detected by the unit battery detection device when each unit charging control period is finished; the charging loop is also used for maintaining that only n unit batteries in each unit charging control period are positioned in the charging loop, the unit charging control period is between 0.1 and 2 minutes, and the interval time between every two adjacent unit charging control periods is less than 10 ms;
the charging control device comprises a control unit, a data analysis unit and a switching instruction generation unit, wherein:
the control unit is used for generating a charging starting instruction to the switching instruction generating unit; the data analysis unit is also used for starting the data analysis unit when each unit charging control cycle is finished after the charging starting command is sent out; the charging stopping device is also used for generating a charging stopping instruction to the switching instruction generating unit according to the information fed back by the data analyzing unit;
the data analysis unit is used for analyzing all the parameters of the unit batteries detected and obtained by the unit battery detection device and generating switching information to the switching instruction generation unit or generating all full-charging information to the control unit according to the analysis result;
the switching instruction generating unit is used for generating a starting switching instruction to the switching control device when a charging starting instruction is received, wherein the starting switching instruction comprises 'switching-in' and the serial numbers of the n unit batteries; the switching control device is also used for generating switching instructions to the switching control device according to switching information sent by the data analysis unit, wherein the switching instructions comprise serial numbers of 'switching in' and m unit batteries, 'switching off' and serial numbers of m unit batteries; the switching control device is also used for generating a cutting instruction to the switching control device according to the charging stopping instruction, wherein the cutting instruction comprises cutting and serial numbers of all unit batteries positioned in the charging loop;
the data analysis unit is used for analyzing the parameters of all the unit batteries detected and obtained by the unit battery detection device, and the data analysis unit is used for:
judging the terminal voltage of each n + x unit cells, and if the terminal voltages are in full charge state, generating full charge information; otherwise, sorting the parameters of the n unit batteries in the charging loop, combining the serial numbers of the m unit batteries with the cut voltages from large to small, and adding switching information; and (3) sorting the parameters of the x unit batteries outside the charging loop, and combining the serial numbers of the m unit batteries with the voltages from small to large and the 'cut-in' into the switching information to form final switching information.
6. The battery pack cyclic discharge system is characterized in that a discharge object of the battery pack cyclic discharge system is a battery pack consisting of n + x unit cells, the battery pack cyclic discharge system comprises n + x fling-cut switches, unit cell detection devices, fling-cut control devices and discharge control devices, and the fling-cut switches are controlled bidirectional fling-cut switches, wherein:
the switching control device is used for switching one or more appointed unit batteries into or out of a discharging loop according to a switching instruction sent by the charging control device;
the unit cell detection device is used for detecting the parameters of each unit cell in the battery pack;
the discharge control device is used for controlling the starting and stopping of each unit discharge control period in the discharge process and generating a switching instruction according to the parameters of the unit batteries detected by the unit battery detection device when each unit discharge control period is finished; the device is also used for maintaining that only n unit cells in each unit discharge control period are positioned in a discharge loop, the unit discharge control period is between 0.1 and 2 minutes, and the interval time between two adjacent unit discharge control periods is less than 10 ms;
the discharge control device comprises a control unit, a data analysis unit and a switching instruction generation unit, wherein:
the control unit is used for generating a starting discharge instruction to the switching instruction generating unit; the data analysis unit is also used for starting the data analysis unit when each unit discharge control period is finished after the discharge starting command is sent out; the switching instruction generating unit is used for generating a switching instruction according to the information fed back by the data analyzing unit;
the data analysis unit is used for analyzing the parameters of all the unit batteries detected and obtained by the unit battery detection device and generating switching information to the switching instruction generation unit or generating all emptying information to the control unit according to the analysis result;
the switching command generating unit is used for generating a starting switching command to the switching control device when receiving a starting discharging command, wherein the starting switching command comprises 'switching-in' and the serial numbers of the n unit batteries; the switching control device is also used for generating switching instructions to the switching control device according to switching information sent by the data analysis unit, wherein the switching instructions comprise serial numbers of 'switching in' and m unit batteries, 'switching off' and serial numbers of m unit batteries; the device is also used for generating an excision instruction to the switching control device according to the discharge stopping instruction, wherein the excision instruction comprises excision and serial numbers of all unit batteries positioned in the discharge loop;
the data analysis unit is used for analyzing the parameters of all the unit batteries detected and obtained by the unit battery detection device, and the data analysis unit is used for:
judging the terminal voltage of each n + x unit cells, and if the terminal voltages are all in a venting state, generating all venting information; otherwise, sorting the parameters of the n unit batteries in the discharge loop, combining the serial numbers of the m unit batteries with the cut-off voltage from small to large, and adding switching information; and (3) sorting the parameters of the x unit batteries outside the discharge loop, and combining the serial numbers of the m unit batteries with the voltages from large to small and the 'cut-in' into the switching information to form final switching information.
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| CN110011379B (en) * | 2019-04-24 | 2021-04-30 | 北京中宸泓昌科技有限公司 | Discharge balancing device and method of energy storage system |
| CN112600265B (en) * | 2020-12-02 | 2021-11-30 | 刘铭新 | Battery pack charging/discharging method and device suitable for low-temperature environment |
| CN113644328B (en) * | 2021-08-20 | 2023-10-24 | 刘铭新 | Flexible control method and device for dynamic reconfiguration battery module |
| CN117200404B (en) * | 2023-11-07 | 2024-04-09 | 浙江华宇钠电新能源科技有限公司 | Multi-switch switching circuit applied to sodium ion battery and vehicle based on multi-switch switching circuit |
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