CN116826878A - Dynamic safety protection battery unit and energy storage system - Google Patents
Dynamic safety protection battery unit and energy storage system Download PDFInfo
- Publication number
- CN116826878A CN116826878A CN202210103808.7A CN202210103808A CN116826878A CN 116826878 A CN116826878 A CN 116826878A CN 202210103808 A CN202210103808 A CN 202210103808A CN 116826878 A CN116826878 A CN 116826878A
- Authority
- CN
- China
- Prior art keywords
- battery
- controllable switch
- string
- unit
- 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
- 238000004146 energy storage Methods 0.000 title claims abstract description 68
- 230000002159 abnormal effect Effects 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000012544 monitoring process Methods 0.000 claims description 45
- 238000004891 communication Methods 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery unit and an energy storage system with dynamic safety protection, which adopt a novel system architecture and a novel control method, adopt the component units of a battery and a battery pack string which are in hot backup or parallel operation in the battery unit as bypass on-line replacement fault components, improve the self-healing capacity of the battery unit, dynamically isolate and cut out the battery or the battery pack string which has abnormal faults in the abnormal fault battery unit, effectively solve the problem of seamless cutting out the fault battery or the battery pack string, facilitate maintenance and replacement operation, and ensure continuous operation of the battery string formed by the battery units; the system architecture of the direct bypass of the connecting power line and the improper control method of firstly controlling the disconnection of the fault battery unit and then controlling the conduction of the bypass, so that the series string of the battery units is instantaneously powered off, and the energy storage system is stopped or broken down are overcome; the battery unit for realizing dynamic safety protection ensures that the energy storage system achieves higher safety and better economy.
Description
Technical Field
The invention belongs to the technical field of battery energy storage, and particularly relates to a battery unit and an energy storage system with dynamic safety protection.
Background
The battery energy storage system is a battery pack formed by connecting a plurality of batteries with small electric quantity in series-parallel connection, and is connected into a power grid through power conversion equipment for charging and discharging. Because of the unavoidable defects of the inconsistency of the battery monomers, particularly the inconsistency of the battery used for a period of time and the retired battery, the battery of the battery energy storage system is different in installation and physical position and relatively fixed in connection and arrangement, the influence of the inconsistency on the charge and discharge electric quantity of the battery is further increased, the short plate effect of the overall efficiency reduction caused by the charge and discharge of the battery energy storage system is caused, and the unsafe risk of overcharge or overdischarge and even explosion of the battery is caused easily due to overlarge voltage and electric quantity deviation of the individual battery.
In order to solve and realize the personalized battery monomer and battery pack, and the consistency control and the safe, healthy and efficient operation of the energy storage system in the operation process of the battery pack string and the energy storage unit system, the short-circuit effect is reduced; when the energy storage system is designed and integrated, different component selection and configuration methods, system architectures and connection modes and operation control relations among system components are adopted, so that the actual effect of the energy storage system is determined. The patent number of the invention patent No. CN113193628 issued by the national intellectual property office of a battery unit, an energy storage system and a battery unit fault protection method, the technical scheme claims, the specification and the accompanying figures 1-7 issue and propose a battery unit, an energy storage system and a battery unit fault protection method, and the issued technical scheme designs a system and a system architecture diagram; as can be seen from claim 1, claim 2, claim 13, claim 14 and the corresponding contents of the specification, referring to fig. 1 to fig. 4, the essential characteristics of the scheme are that a switch for controlling the open circuit of the battery cell series group string is arranged on the battery cell of the battery cell series group string, the fault battery cell and the battery cell series group string circuit are disconnected to form the open circuit, and then the bypass power line short circuit is used for replacing the battery cell generating the fault through the closed conduction of the bypass power line and the switch; the 40 th to 45 th sections of the specification give out the connection relation and function between the design conception of the technical proposal and the system components, and give out the corresponding control rules and methods; it is clear from this that this solution has obvious drawbacks:
firstly, the design of the system architecture and the control method according to the scheme, such as the content corresponding to the claims 1, 2 and 13, 14 and the description of the scheme, and the content described with reference to fig. 1 to 4 and fig. 6 and 7, it can be known that the serious defects exist in the substantial protection content in the scheme, such as: when a faulty battery unit is found, the first controllable switch is controlled to be disconnected, so that a circuit formed by connecting the battery unit with other battery units in series is opened, a battery unit serial group formed by connecting the faulty battery unit with other battery units in series is opened, the battery unit serial group is instantaneously disconnected with a direct current bus of the power conversion equipment, the power conversion equipment is interrupted by the open circuit of the battery unit serial group, a direct current side power failure is generated, and the power conversion equipment is stopped in a fault manner.
Secondly, claim 11 and claim 12 of the technical solution assume a precondition of control, that is, the power conversion apparatus still has the capability of performing charge and discharge operations on the battery cells in the case that the number of battery cells connected in series in the circuit is reduced. This assumption limits the effectiveness of this scheme; as is well known, the direct-current terminal voltage of the battery energy storage system is designed according to the direct-current voltage working range requirement of the direct-current side of the power conversion equipment, the number of battery units is reduced by more than one, the risk that the corresponding direct-current side voltage working range cannot be met occurs, and the energy storage system is stopped or broken down is caused. Therefore, it is necessary to ensure that the terminal voltage of the series strings of battery cells should be maintained to satisfy the dc side operating voltage range of the power conversion apparatus after more than one battery cell is isolated and cut out due to abnormal failure.
In order to overcome the defects of the prior art, the technical difficulties and problems are effectively solved. The invention adopts a new system architecture and a control method, and avoids the improper control method that the bypass directly adopts the system architecture connected with the power line and firstly controls to disconnect the fault battery unit and then controls the bypass to be conducted. According to the invention, the battery serving as a bypass and the battery pack string are designed in the battery unit to serve as the part unit for hot backup or parallel operation to replace the failed part unit on line, so that the self-healing capacity of the battery unit is improved, the abnormal failure in the battery unit is effectively solved, the abnormal failure battery or the battery pack string is dynamically isolated and cut out, and the maintenance and replacement operation are facilitated; the battery or the battery pack string with the seamless cutting failure is effectively solved, and meanwhile, the continuous operation of the battery string formed by the battery units is ensured.
Disclosure of Invention
The battery unit comprises a battery pack string P formed by connecting two single batteries or battery packs in series, and further comprises a battery monitoring unit, a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the flexible system framework of the hot standby operation mode connection framework, the parallel operation mode connection framework and the serial operation mode connection framework is respectively formed by controlling the on-off of the first controllable switch K1, the second controllable switch K2 and the third controllable switch K3; the battery monitoring unit in the battery unit monitors the voltage, the temperature and the real-time operation parameters of the single battery or the battery pack in real time, and when detecting that the single battery or the battery pack of the battery unit is abnormal: and controlling the on-off states of the corresponding first controllable switch K1, the second controllable switch K2 and the third controllable switch K3, isolating or cutting out the abnormal single batteries or the battery pack series-connected battery pack strings P, and controlling the battery pack strings P and the battery unit series-connected battery pack strings which are connected in series and have no abnormal faults in the energy storage system circuit to continuously and normally operate.
The battery unit and the energy storage system for dynamic safety protection are characterized in that the connection relation of a hot standby operation mode connection framework is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is respectively connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the method is characterized in that the battery string P of the ith single battery or battery pack series connection of any battery unit is connected to operate, and when the battery string P of the jth single battery or battery pack series connection is hot standby, namely: the hot backup operation mode connection structure is characterized in that two ends of a first controllable switch K1 are respectively connected between a positive terminal of a battery unit and a positive electrode of a battery pack string P which is formed by connecting an ith single battery or a battery pack in series, and the first controllable switch K1 is controlled to be closed and conducted; meanwhile, two ends of the second controllable switch K2 are respectively connected between the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be disconnected; the two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected;
or, the j-th single battery or the battery pack series-connected battery string P of any battery unit is connected to run, and when the j-th single battery or the battery pack series-connected battery string P is a hot backup, namely: the hot backup operation mode connection structure is characterized in that two ends of a first controllable switch K1 are respectively connected between a positive terminal of a battery unit and a positive electrode of a battery pack string P which is formed by serially connecting an ith single battery or a battery pack, and the first controllable switch K1 is controlled to be disconnected; meanwhile, a second controllable switch K2 is respectively connected between the negative electrode of the battery string P of which the ith single battery or battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or battery pack is connected in series, and the second controllable switch K2 is controlled to be closed and conducted; and two ends of the third controllable switch K3 are respectively connected between the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected, so that the battery unit of the hot backup operation mode connection framework is formed.
The battery unit and the energy storage system for dynamic safety protection are characterized in that the connection relation of a parallel operation mode connection framework is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is respectively connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the method is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit and a positive electrode of a battery pack string P which is connected in series with an ith single battery or a battery pack, and the first controllable switch K1 is controlled to be closed and conducted; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be closed and conducted; and two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected to form a battery unit of the parallel operation mode connection framework.
The battery unit and the energy storage system for dynamic safety protection are characterized in that the connection relation of a series operation mode connection framework is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is respectively connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the method is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit and a positive electrode of a battery pack string P of which an ith single battery or a battery pack is connected in series, and the first controllable switch K1 is controlled to be disconnected; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be disconnected; the two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be closed and conducted to form a battery unit of a series operation mode connection framework; the method is also characterized in that when the battery unit series group strings the whole battery unit with abnormal faults when the abnormal faults of the battery unit are cut out, the normal battery unit is controlled to form a series operation mode connection framework, and the battery unit with the abnormal faults is replaced, so that the voltage of the battery unit series group string end meets the requirement of the working voltage of the direct current side of the power conversion equipment; the control method for cutting out and replacing the abnormal fault battery unit comprises the following steps: firstly, a direct current group string positive electrode connecting switch is controlled to be disconnected with a high-voltage protection circuit and a direct current group string negative electrode connecting switch is controlled to be disconnected with the high-voltage protection circuit, after a battery group string P of an ith single battery or a battery pack of an abnormal fault battery unit and a battery group string P of a jth single battery or a battery pack of the abnormal fault battery unit are taken out, a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 are controlled to be closed and conducted, the abnormal fault battery unit is bypassed and cut out, a normal battery unit of a serial operation mode connecting framework is connected into the battery unit serial group string, and therefore, the direct current group string positive electrode connecting switch is controlled to be closed and conducted with the high-voltage protection circuit and the direct current group string negative electrode connecting switch and the high-voltage protection circuit are controlled to form a normal operation energy storage system.
The utility model provides a battery unit and energy storage system of dynamic safety protection, its characterized in that, battery monitoring unit in the battery unit, when detecting that battery unit's battery cell or battery package appear unusual, the break-make of control first controllable switch K1, second controllable switch K2 and third controllable switch K3, specific control is: checking the operation mode connection architecture of the current battery cell, if: the current operation mode connection structure is a hot standby operation mode, and the battery string P of the ith single battery or battery pack series connection is in an operation state and has abnormal faults, and the battery string P of the jth single battery or battery pack series connection is in a hot standby state, at the moment, the third controllable switch K3 is in an off state, the second controllable switch K2 is controlled to be closed and conducted firstly, then the first controllable switch K1 is controlled to be opened, and the battery string P of the ith single battery or battery pack series connection with abnormal faults is opened and isolated and cut; if the battery string P of the ith single battery or the battery pack series connection is in a hot standby state, and the battery string P of the jth single battery or the battery pack series connection is in an operating state and has abnormal faults, at the moment, the third controllable switch K3 is in an off state, the first controllable switch K1 is controlled to be closed and conducted, the second controllable switch K2 is controlled to be opened, and the battery string P of the jth single battery or the battery pack series connection with abnormal faults is opened and isolated and cut.
Or the current parallel operation mode connection architecture is adopted, the battery string P of the ith single battery or battery pack series connection is in an operation state and has abnormal faults, the battery string P of the jth single battery or battery pack series connection is in a parallel operation state, at the moment, the third controllable switch K3 is in an open state, the first controllable switch K1 and the second controllable switch K2 are in a closed and conducting state, the second controllable switch K2 is controlled to be kept closed and conducting firstly, then the first controllable switch K1 is controlled to be disconnected, and the battery string P of the ith single battery or battery pack series connection with abnormal faults is opened and isolated and cut; if the battery string P of the ith single battery or the battery pack is in a parallel operation state, and the battery string P of the jth single battery or the battery pack is in an abnormal failure in the operation state, the third controllable switch K3 is kept in an open state, the first controllable switch K1 is controlled to be kept closed and turned on, the second controllable switch K2 is controlled to be turned off, and the battery string P of the jth single battery or the battery pack is opened and isolated.
The battery unit and the energy storage system for dynamic safety protection are characterized in that the battery unit detects that the single battery or the battery pack of the battery unit has abnormal faults, and the abnormal faults comprise any one or combination of any multiple parameters of temperature, voltage and SOC.
The battery unit and the energy storage system for dynamic safety protection are characterized in that a battery monitoring unit in the battery unit acquires operation parameters of a single battery or a battery pack in the battery unit, and whether the battery unit fails abnormally or not is judged according to the operation parameters.
The battery monitoring unit in the battery unit acquires the single battery or battery pack operation parameters of the battery unit through a battery monitoring communication line, uploads the single battery or battery pack operation parameters to a battery management unit which centrally controls the energy storage system formed by a plurality of battery units through a control communication line, judges whether the battery unit is faulty or not through the battery management unit, and sends a judging result to the battery monitoring unit in the battery unit.
The battery unit and the energy storage system for dynamic safety protection are characterized in that the single battery or the battery pack part is a single battery, or is a series combination of a plurality of single batteries, or is a parallel combination of a plurality of single batteries, or is a series-parallel combination of a plurality of single batteries.
The battery unit and the energy storage system of the dynamic safety protection are characterized in that the energy storage system comprises: the battery unit serial group string is formed by connecting a plurality of battery units in series, and comprises a battery management unit, power conversion equipment, a control communication line, a positive direct current bus, a negative direct current bus, a direct current group string positive connection switch and a high-voltage protection circuit, and a direct current group string negative connection switch and a high-voltage protection circuit; the battery cell series connection device is characterized in that a positive electrode and a negative electrode of a battery cell series connection string are connected into power conversion equipment through a direct current string positive electrode connecting switch and a high-voltage protection circuit, and a direct current string negative electrode connecting switch and a high-voltage protection circuit respectively, so that an energy storage system and a power path for charging and discharging the battery cell are formed; meanwhile, the battery management unit is respectively connected with the power conversion equipment and the battery monitoring units in the battery units through the control communication line to form an energy storage system and a monitoring path.
The invention provides a battery unit and an energy storage system with dynamic safety protection, which adopt a novel system architecture and a novel control method, adopt the component units of a battery and a battery pack string which are in hot backup or parallel operation in the battery unit as bypass on-line replacement fault components, improve the self-healing capacity of the battery unit, dynamically isolate and cut out the battery or the battery pack string which has abnormal faults in the abnormal fault battery unit, effectively solve the problem of seamless cutting out the fault battery or the battery pack string, facilitate maintenance and replacement operation, and ensure continuous operation of the battery string formed by the battery units; the system architecture of the direct bypass of the connecting power line and the improper control method of firstly controlling the disconnection of the fault battery unit and then controlling the conduction of the bypass, so that the series string of the battery units is instantaneously powered off, and the energy storage system is stopped or broken down are overcome; the battery unit for realizing dynamic safety protection ensures that the energy storage system achieves higher safety and better economy.
Drawings
Fig. 1 is a schematic block diagram of a dynamic safety protected battery cell and energy storage system.
Fig. 2 is a schematic diagram of the same cell configuration principle.
Detailed Description
As an example, a dynamic safety protected battery cell and energy storage system are described with reference to the accompanying drawings, but the described embodiments are some, but not all, embodiments in which the present invention is applied to a dynamic safety protected battery cell and energy storage system. All other embodiments, based on the embodiments of the invention, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the invention; the technique and scheme of the present invention are not limited to those given in the present embodiment example.
As shown in fig. 1-2, a battery unit (10) for dynamic safety protection and an energy storage system, wherein the battery unit comprises a battery pack string P formed by connecting two single batteries or battery packs in series, and further comprises a battery monitoring unit (11), a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the flexible system framework of the hot standby operation mode connection framework, the parallel operation mode connection framework and the serial operation mode connection framework is respectively formed by controlling the on-off of the first controllable switch K1, the second controllable switch K2 and the third controllable switch K3; the battery monitoring device is characterized in that a battery monitoring unit (11) in the battery unit (10) monitors the voltage, the temperature and the real-time operation parameters of the single battery or the battery pack in real time, and when detecting that the single battery or the battery pack of the battery unit (10) is abnormal: the on-off states of the corresponding first controllable switch K1, the second controllable switch K2 and the third controllable switch K3 are controlled, abnormal single batteries or battery pack series-connected battery pack strings P are isolated or cut out, and the battery pack strings P and the battery unit series-connected battery pack strings (3) which are connected in series and have no abnormal faults in the energy storage system circuit are controlled to continuously and normally run.
As shown in fig. 2, the connection relationship of the connection architecture of the dynamic safety protection battery unit and the energy storage system is that a battery monitoring unit (11) in the battery unit (10) is respectively connected with each single battery of a single battery or a battery pack through a battery monitoring communication line (12), and is simultaneously respectively connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the battery pack is characterized in that when the battery pack string P (Pi) of the ith single battery cell or the battery pack of any battery unit (10) connected in series is connected to operate, and the battery pack string P (Pj) of the jth single battery cell or the battery pack connected in series is in hot standby, namely: the connection structure of the hot backup operation mode is characterized in that a first controllable switch K1 is respectively connected between a positive terminal of a battery unit (10) and a positive electrode of a battery pack string P (Pi) of which an ith single battery or a battery pack is connected in series, and the first controllable switch K1 is closed and conducted; meanwhile, the second controllable switch K2 is respectively connected between the negative electrode of the battery string P (Pi) of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P (Pj) of the jth single battery or the battery pack connected in series, and the second controllable switch K2 is disconnected; and both ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P (Pi) of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P (Pj) of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is disconnected;
or, when the j-th single battery or the battery pack series-connected battery string P (Pj) of any battery unit (10) is connected to run, the i-th single battery or the battery pack series-connected battery string P (Pi) is in hot standby, namely: the hot backup operation mode connection structure is characterized in that two ends of a first controllable switch K1 are respectively connected between a positive terminal of a battery unit (10) and a positive electrode of a battery pack string P (Pi) formed by serially connecting an ith single battery or a battery pack, and the first controllable switch K1 is disconnected; meanwhile, a second controllable switch K2 is respectively connected between the negative electrode of the battery string P (Pi) of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P (Pj) of the jth single battery or the battery pack connected in series, and the second controllable switch K2 is closed and conducted; and a third controllable switch K3 is connected between the positive electrode of the battery string P (Pi) in which the i-th unit cell or the battery pack is connected in series and the negative electrode of the battery string P (Pj) in which the j-th unit cell or the battery pack is connected in series, respectively, and the third controllable switch K3 is turned off.
As shown in fig. 2, the connection relationship of the connection architecture of the parallel operation mode is that a battery monitoring unit (11) in the battery unit (10) is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line (12), and is simultaneously connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 respectively; the battery pack is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit (10) and a positive electrode of a battery pack string P (Pi) formed by connecting an ith single battery or a battery pack in series, and the first controllable switch K1 is closed and conducted; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P (Pi) of the ith single battery or the battery pack in series connection and the negative electrode of the battery string P (Pj) of the jth single battery or the battery pack in series connection, and the second controllable switch K2 is closed and conducted; and both ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P (Pi) of the ith single battery or battery pack connected in series and the negative electrode of the battery string P (Pj) of the jth single battery or battery pack connected in series, and the third controllable switch K3 is disconnected.
As shown in fig. 2, the connection relationship of the connection architecture of the series operation mode is that a battery monitoring unit (11) in the battery unit (10) is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line (12), and is simultaneously connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 respectively; the method is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit (10) and a positive electrode of a battery pack string P (Pi) of which an ith single battery or a battery pack is connected in series, and the first controllable switch K1 is disconnected; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P (Pi) of the ith single battery or the battery pack in series connection and the negative electrode of the battery string P (Pj) of the jth single battery or the battery pack in series connection, and the second controllable switch K2 is disconnected; and the two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P (Pi) of the ith single battery or battery pack connected in series and the negative electrode of the battery string P (Pj) of the jth single battery or battery pack connected in series, and the third controllable switch K3 is closed and conducted to form a battery unit (10) of a series operation mode connection framework; the power conversion device is characterized in that when the battery unit series group string (3) cuts out the battery unit integrally due to abnormal faults of the battery unit, the normal battery unit is controlled to form a series operation mode connection framework, and the battery unit cut out of the abnormal faults is replaced, so that the end voltage of the battery unit series group string (3) meets the direct-current side working voltage requirement of the power conversion device (2); the control method for cutting out and replacing the abnormal fault battery unit comprises the following steps: firstly, a direct current string positive electrode connecting switch is controlled to be disconnected with a high-voltage protection circuit (7) and a direct current string negative electrode connecting switch is controlled to be disconnected with a high-voltage protection circuit (8), after a battery string P (Pi) of an ith single battery or a battery pack of an abnormal fault battery unit and a battery string P (Pj) of a jth single battery or a battery pack of the battery pack are taken out and connected in series, a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 are controlled to be closed and conducted, the abnormal fault battery unit is bypassed and cut out, and a normal battery unit of a serial operation mode connecting framework is connected into the battery unit serial group string (3), so far, the closed and conducted of the direct current string positive electrode connecting switch and the high-voltage protection circuit (7) and the direct current string negative electrode connecting switch and the high-voltage protection circuit (8) are controlled, and a normal operation energy storage system is formed.
As shown in fig. 2, the battery unit and the energy storage system for dynamic safety protection are characterized in that, when detecting that an abnormality occurs in a single battery or a battery pack of the battery unit (10), the battery monitoring unit (11) in the battery unit (10) controls on/off of the first controllable switch K1, the second controllable switch K2 and the third controllable switch K3, and specifically controls: checking the operation mode connection architecture of the current battery unit (10), wherein the operation mode connection architecture is a hot standby operation mode currently, an abnormal fault occurs in a battery string P (Pi) of the i-th single battery or battery pack in series connection in an operation state, the battery string P (Pj) of the j-th single battery or battery pack in series connection is in a hot standby state, at the moment, a third controllable switch K3 is in an off state, firstly, controlling a second controllable switch K2 to be closed and conducted, then controlling a first controllable switch K1 to be opened, and opening and isolating the battery string P (Pi) of the i-th single battery or battery pack in series connection with the abnormal fault; if the battery string P (Pi) of the ith single battery or battery pack is in a hot standby state, and the battery string P (Pj) of the jth single battery or battery pack is in an operating state and has an abnormal fault, at this time, the third controllable switch K3 is in an off state, the first controllable switch K1 is controlled to be turned on and turned off, and then the second controllable switch K2 is controlled to be turned off, so that the battery string P (Pj) of the jth single battery or battery pack with the abnormal fault is opened and isolated.
Or the current parallel operation mode connection architecture is adopted, the battery string P (Pi) of the ith single battery or battery pack is connected in series in an operation state and has abnormal faults, the battery string P (Pj) of the jth single battery or battery pack is connected in series in the parallel operation state, at the moment, the third controllable switch K3 is in an open state, the first controllable switch K1 and the second controllable switch K2 are in a closed and conducting state, the second controllable switch K2 is controlled to be kept closed and conducting firstly, then the first controllable switch K1 is controlled to be disconnected, and the battery string P (Pi) of the ith single battery or battery pack connected in series with abnormal faults is opened and isolated and cut; if the battery string P (Pi) of the ith single battery or battery pack connected in series is in a parallel operation state, and the battery string P (Pj) of the jth single battery or battery pack connected in series is in an operation state and has an abnormal fault, at this time, the third controllable switch K3 continues to keep an open state, the second controllable switch K1 is controlled to be kept closed and turned on, the first controllable switch K2 is controlled to be turned off, and the battery string P (Pj) of the jth single battery or battery pack connected in series with the abnormal fault is opened and isolated and cut out.
As shown in fig. 2, the battery unit (10) detects that the single battery or the battery pack of the battery unit (10) has the abnormal fault, including any one or any combination of multiple abnormal parameters of temperature, voltage and SOC.
As shown in fig. 2, the battery monitoring unit (11) in the battery unit (10) obtains the running parameters of the single battery or the battery pack in the battery unit (10), and accordingly determines whether the battery unit (10) has an abnormal fault or not.
As shown in fig. 2, the battery monitoring unit (11) in the battery unit (10) obtains the operation parameters of the single battery or the battery pack of the battery unit (10) through the battery monitoring communication line (12), uploads the operation parameters to the battery management unit (1) which centrally controls the energy storage system formed by a plurality of battery units (10) through the control communication line (4), and the battery management unit (1) judges whether the battery unit (10) fails or not and sends the judgment result to the battery monitoring unit (11) in the battery unit (10).
The battery unit and the energy storage system for dynamic safety protection are characterized in that the single battery or the battery pack part is a single battery, or is a series combination of a plurality of single batteries, or is a parallel combination of a plurality of single batteries, or is a series-parallel combination of a plurality of single batteries.
As shown in fig. 1-2, the battery unit and the energy storage system for dynamic safety protection are characterized in that the energy storage system comprises: a battery unit serial group string (3) formed by connecting a plurality of battery units in series, a battery management unit (1), a power conversion device (2), a control communication line (4), a positive direct current bus (5), a negative direct current bus (6), a direct current group string positive connection switch and a high-voltage protection circuit (7), and a direct current group string negative connection switch and a high-voltage protection circuit (8); the energy storage system is characterized in that the positive electrode and the negative electrode of a battery unit serial group string (3) are connected into a power conversion device (2) through a direct current group string positive electrode connecting switch and a high-voltage protection circuit (7) and a direct current group string negative electrode connecting switch and a high-voltage protection circuit (8) respectively, and a positive direct current bus (5) and a negative direct current bus (6) which are connected form a power path for charging and discharging an energy storage system and a battery unit (10); meanwhile, the battery management unit (1) is respectively connected with the power conversion equipment (2) and the battery monitoring units (11) in the battery units (10) through the control communication line (4) to form an energy storage system and a monitoring path.
The invention provides a battery unit and an energy storage system with dynamic safety protection, which adopt a novel system architecture and a novel control method, adopt a bypass in the battery unit as a part unit of a battery and a battery pack string which are in hot standby or parallel operation to replace fault parts on line, improve the self-healing capacity of the battery unit, effectively solve the problem of carrying out dynamic isolation cutting on the abnormal fault battery or the battery pack string in the abnormal fault battery unit, effectively solve the problem of seamless cutting out of the fault battery or the battery pack string, facilitate maintenance and replacement operation, and ensure that the battery pack string formed by the battery unit continuously operates. The system architecture of the direct bypass of the connecting power line and the improper control method of firstly controlling the disconnection of the fault battery unit and then controlling the conduction of the bypass, so that the series string of the battery units is instantaneously powered off, and the energy storage system is stopped or broken down are overcome; the battery unit for realizing dynamic safety protection ensures that the energy storage system achieves higher safety and better economy.
Specific embodiments are given above, but the invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various modifications, formulas, and parameters can be devised in accordance with the principles and concepts of the invention without the need for inventive faculty, and variations, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and concepts of the invention.
Claims (10)
1. The battery unit comprises a battery pack string P formed by connecting two single batteries or battery packs in series, and further comprises a battery monitoring unit, a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3; the flexible system framework of the hot standby operation mode connection framework, the parallel operation mode connection framework and the serial operation mode connection framework is respectively formed by controlling the on-off of the first controllable switch K1, the second controllable switch K2 and the third controllable switch K3; the battery monitoring unit in the battery unit monitors the voltage, the temperature and the real-time operation parameters of the single battery or the battery pack in real time, and when detecting that the single battery or the battery pack of the battery unit is abnormal: and controlling the on-off states of the corresponding first controllable switch K1, the second controllable switch K2 and the third controllable switch K3, isolating or cutting out the abnormal single batteries or the battery pack series-connected battery pack strings P, and controlling the battery pack strings P and the battery unit series-connected battery pack strings which are connected in series and have no abnormal faults in the energy storage system circuit to continuously and normally operate.
2. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the connection relation of the connection framework of the hot standby operation mode is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is simultaneously connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 respectively; the method is characterized in that the battery string P of the ith single battery or battery pack series connection of any battery unit is connected to operate, and when the battery string P of the jth single battery or battery pack series connection is hot standby, namely: the hot backup operation mode connection structure is characterized in that two ends of a first controllable switch K1 are respectively connected between a positive terminal of a battery unit and a positive electrode of a battery pack string P which is formed by connecting an ith single battery or a battery pack in series, and the first controllable switch K1 is controlled to be closed and conducted; meanwhile, two ends of the second controllable switch K2 are respectively connected between the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be disconnected; the two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected;
or, the j-th single battery or the battery pack series-connected battery string P of any battery unit is connected to run, and when the j-th single battery or the battery pack series-connected battery string P is a hot backup, namely: the hot backup operation mode connection structure is characterized in that two ends of a first controllable switch K1 are respectively connected between a positive terminal of a battery unit and a positive electrode of a battery pack string P which is formed by serially connecting an ith single battery or a battery pack, and the first controllable switch K1 is controlled to be disconnected; meanwhile, a second controllable switch K2 is respectively connected between the negative electrode of the battery string P of which the ith single battery or battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or battery pack is connected in series, and the second controllable switch K2 is controlled to be closed and conducted; and two ends of the third controllable switch K3 are respectively connected between the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected, so that the battery unit of the hot backup operation mode connection framework is formed.
3. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the connection relation of the parallel operation mode connection architecture is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is simultaneously connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 respectively; the method is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit and a positive electrode of a battery pack string P which is connected in series with an ith single battery or a battery pack, and the first controllable switch K1 is controlled to be closed and conducted; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be closed and conducted; and two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be disconnected to form a battery unit of the parallel operation mode connection framework.
4. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the connection relation of the connection architecture of the series operation mode is that a battery monitoring unit in the battery unit is connected with each single battery of a single battery or a battery pack through a battery monitoring communication line, and is simultaneously connected with and controls a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 respectively; the method is characterized in that two ends of a first controllable switch K1 are respectively connected with a positive terminal of a battery unit and a positive electrode of a battery pack string P of which an ith single battery or a battery pack is connected in series, and the first controllable switch K1 is controlled to be disconnected; meanwhile, two ends of the second controllable switch K2 are respectively connected with the negative electrode of the battery string P of which the ith single battery or the battery pack is connected in series and the negative electrode of the battery string P of which the jth single battery or the battery pack is connected in series, and the second controllable switch K2 is controlled to be disconnected; the two ends of the third controllable switch K3 are respectively connected with the positive electrode of the battery string P of the ith single battery or the battery pack connected in series and the negative electrode of the battery string P of the jth single battery or the battery pack connected in series, and the third controllable switch K3 is controlled to be closed and conducted to form a battery unit of a series operation mode connection framework; the method is also characterized in that when the battery unit series group strings the whole battery unit with abnormal faults when the abnormal faults of the battery unit are cut out, the normal battery unit is controlled to form a series operation mode connection framework, and the battery unit with the abnormal faults is replaced, so that the voltage of the battery unit series group string end meets the requirement of the working voltage of the direct current side of the power conversion equipment; the control method for cutting out and replacing the abnormal fault battery unit comprises the following steps: firstly, a direct current group string positive electrode connecting switch is controlled to be disconnected with a high-voltage protection circuit and a direct current group string negative electrode connecting switch is controlled to be disconnected with the high-voltage protection circuit, after a battery group string P of an ith single battery or a battery pack of an abnormal fault battery unit and a battery group string P of a jth single battery or a battery pack of the abnormal fault battery unit are taken out, a first controllable switch K1, a second controllable switch K2 and a third controllable switch K3 are controlled to be closed and conducted, the abnormal fault battery unit is bypassed and cut out, a normal battery unit of a serial operation mode connecting framework is connected into the battery unit serial group string, and therefore, the direct current group string positive electrode connecting switch is controlled to be closed and conducted with the high-voltage protection circuit and the direct current group string negative electrode connecting switch and the high-voltage protection circuit are controlled to form a normal operation energy storage system.
5. The battery unit and the energy storage system according to claim 1, wherein the battery monitoring unit in the battery unit controls the on-off of the first controllable switch K1, the second controllable switch K2 and the third controllable switch K3 when detecting that the single battery or the battery pack of the battery unit is abnormal, and specifically controls: checking the operation mode connection architecture of the current battery cell, if: the current operation mode connection structure is a hot standby operation mode, and the battery string P of the ith single battery or battery pack series connection is in an operation state and has abnormal faults, and the battery string P of the jth single battery or battery pack series connection is in a hot standby state, at the moment, the third controllable switch K3 is in an off state, the second controllable switch K2 is controlled to be closed and conducted firstly, then the first controllable switch K1 is controlled to be opened, and the battery string P of the ith single battery or battery pack series connection with abnormal faults is opened and isolated and cut; if the battery string P of the ith single battery or the battery pack series connection is in a hot standby state, and the battery string P of the jth single battery or the battery pack series connection is in an operating state and has abnormal faults, at the moment, the third controllable switch K3 is in an off state, the first controllable switch K1 is controlled to be closed and conducted, the second controllable switch K2 is controlled to be opened, and the battery string P of the jth single battery or the battery pack series connection with abnormal faults is opened and isolated and cut.
Or the current parallel operation mode connection architecture is adopted, the battery string P of the ith single battery or battery pack series connection is in an operation state and has abnormal faults, the battery string P of the jth single battery or battery pack series connection is in a parallel operation state, at the moment, the third controllable switch K3 is in an open state, the first controllable switch K1 and the second controllable switch K2 are in a closed and conducting state, the second controllable switch K2 is controlled to be kept closed and conducting firstly, then the first controllable switch K1 is controlled to be disconnected, and the battery string P of the ith single battery or battery pack series connection with abnormal faults is opened and isolated and cut; if the battery string P of the ith single battery or the battery pack is in a parallel operation state, and the battery string P of the jth single battery or the battery pack is in an abnormal failure in the operation state, the third controllable switch K3 is kept in an open state, the first controllable switch K1 is controlled to be kept closed and turned on, the second controllable switch K2 is controlled to be turned off, and the battery string P of the jth single battery or the battery pack is opened and isolated.
6. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the battery unit detects that the single battery or the battery pack of the battery unit has the abnormal fault, and the abnormal fault comprises any one or combination of any multiple parameters of temperature, voltage and SOC.
7. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the battery monitoring unit in the battery unit obtains the operation parameters of the single battery or the battery pack in the battery unit, and accordingly judges whether the battery unit has an abnormal fault or not.
8. The battery unit and the energy storage system for dynamic safety protection according to claim 1, wherein the battery monitoring unit in the battery unit obtains the operation parameters of the single battery or the battery pack of the battery unit through a battery monitoring communication line, uploads the operation parameters to a battery management unit for centralized control of the energy storage system formed by a plurality of battery units through a control communication line, and the battery management unit judges whether the battery unit is faulty or not and sends the judging result to the battery monitoring unit in the battery unit.
9. The battery unit and the energy storage system according to claim 1, wherein the single battery or the battery pack part is one single battery, or is a series combination of a plurality of single batteries, or is a parallel combination of a plurality of single batteries, or is a series-parallel combination of a plurality of single batteries.
10. The battery unit and energy storage system of claims 1-8, wherein the energy storage system comprises: the battery unit serial group string is formed by connecting a plurality of battery units in series, and comprises a battery management unit, power conversion equipment, a control communication line, a positive direct current bus, a negative direct current bus, a direct current group string positive connection switch and a high-voltage protection circuit, and a direct current group string negative connection switch and a high-voltage protection circuit; the battery cell series connection device is characterized in that a positive electrode and a negative electrode of a battery cell series connection string are connected into power conversion equipment through a direct current string positive electrode connecting switch and a high-voltage protection circuit, and a direct current string negative electrode connecting switch and a high-voltage protection circuit respectively, so that an energy storage system and a power path for charging and discharging the battery cell are formed; meanwhile, the battery management unit is respectively connected with the power conversion equipment and the battery monitoring units in the battery units through the control communication line to form an energy storage system and a monitoring path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103808.7A CN116826878A (en) | 2022-01-28 | 2022-01-28 | Dynamic safety protection battery unit and energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103808.7A CN116826878A (en) | 2022-01-28 | 2022-01-28 | Dynamic safety protection battery unit and energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116826878A true CN116826878A (en) | 2023-09-29 |
Family
ID=88117182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210103808.7A Pending CN116826878A (en) | 2022-01-28 | 2022-01-28 | Dynamic safety protection battery unit and energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116826878A (en) |
-
2022
- 2022-01-28 CN CN202210103808.7A patent/CN116826878A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110228369B (en) | Battery power system, vehicle and control method | |
| CN202474990U (en) | Non-circulating-current battery pack device | |
| CN214850576U (en) | BMS battery management system | |
| CN107887660A (en) | A kind of automatic adjusument electrokinetic cell system | |
| CN111864889B (en) | Uninterrupted emergency power supply system and power supply method for open-circuit protection of lead-acid storage battery pack | |
| CN102545322A (en) | Battery module, power supply system and battery power supply control method | |
| CN111682626A (en) | BMS battery management system and management method suitable for energy storage cabinet | |
| CN112803578A (en) | Intelligent distribution network power supply module and management method | |
| CN217427736U (en) | Energy storage system of controlled reconfiguration of voltage regulation battery unit | |
| CN110912260A (en) | Master-slave-structured UPS lithium battery system | |
| CN217545611U (en) | Safe and efficient battery energy storage system based on small battery pack array | |
| CN217427695U (en) | Digital energy storage system of reconfigurable direct current module group string | |
| CN220358825U (en) | Dynamic safety protection energy storage system | |
| CN115589060A (en) | Standby device of direct current system for station | |
| CN116826878A (en) | Dynamic safety protection battery unit and energy storage system | |
| CN113253124A (en) | Safe and energy-saving power storage battery nuclear capacity discharging device and method | |
| CN218161832U (en) | Battery unit dynamic balancing and protection control system of energy storage system | |
| CN116094119B (en) | Reconstituted electrochemical energy storage system and method | |
| CN216904388U (en) | Direct current power supply system for storage battery pack | |
| CN211351813U (en) | Master-slave-structured UPS lithium battery system | |
| CN217848992U (en) | Energy storage system for dynamic equalization and reconstruction of battery units | |
| CN117175718A (en) | Energy storage system with controlled reconstruction of voltage-regulating battery unit | |
| CN116599168A (en) | Battery unit dynamic equalization and protection control system of energy storage system | |
| CN214380269U (en) | Emergency power supply | |
| CN217427754U (en) | Battery energy storage system based on online hot backup battery module controlled switching |
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 |