CN108832206B - Battery monitoring device for energy storage stack - Google Patents
Battery monitoring device for energy storage stack Download PDFInfo
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- CN108832206B CN108832206B CN201810640545.7A CN201810640545A CN108832206B CN 108832206 B CN108832206 B CN 108832206B CN 201810640545 A CN201810640545 A CN 201810640545A CN 108832206 B CN108832206 B CN 108832206B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a monitoring device for an energy storage stack.A first voltage measuring unit is connected with a first wiring group and a third wiring group in parallel; the second voltage measuring unit is connected with the second wiring group and the fourth wiring group in parallel; the outputs of the first voltage measuring unit and the second voltage measuring unit are connected with the input of the control unit; the positive terminal of the first wiring group is connected with the positive terminal of the second wiring group through the sampling selector switch and the sampling resistor module; the trigger end or the communication end of the sampling switch is connected with the control unit; the input of the linear amplifying circuit is connected with the sampling resistor module; the bus communication module is in communication connection with the control unit; the first electric control switch trigger terminal and the second electric control switch trigger terminal are connected with the output of the bus communication module in parallel; compared with the prior art, the charging pile energy storage structure has the advantages that the use and management of the charging pile energy storage structure are optimized.
Description
Technical Field
The invention relates to the technical field of charging piles, in particular to the field of charging pile energy storage control application.
Background
At present, each charging pile power supply end of a charging station is connected in parallel at a bus end, the bus end is connected with power input, in order to guarantee that the charging pile can still maintain the work for a certain time under the condition of power input and power failure, the bus end can be connected with energy storage devices such as batteries, in order to guarantee energy storage capacity, an energy storage pile can be formed by connecting a plurality of batteries in series and in parallel in a combined connection mode, and the whole charging pile is connected with the bus end in parallel. The capacity or residual capacity monitoring of the energy storage pile or the battery is very important for the service life of the charging pile, although a battery manufacturer provides a reference for the corresponding relation between the open-circuit voltage of the battery and the battery capacity, because the charging pile is uncertain in use and corresponding to the uncertainty of self-discharge of the battery, the internal resistance of the battery changes along with the aging, the charging and discharging times, the temperature, the discharging depth and other reasons, and a user is informed that the problem exists when the energy storage structure can provide the maximum use quantity of the charging pile on the premise of ensuring the safe discharging depth; the cost of managing the battery of each battery forming the energy storage stack is high, due to the reasons of the topological connection structure of the battery in the energy storage stack, the internal resistance change and the like, the established calculation model is very complex, the calculation model is the same as the battery management of the whole energy storage stack, and the problem of large deviation also exists, like the monitoring of a mobile phone battery, although the display electric quantity of the mobile phone is still 20%, the battery management can be perceived as 5% in the actual use process; the influence on the use experience of a user who charges the charging pile for energy storage is large, and the influence on the structure of the energy storage pile due to over discharge of the energy storage pile can be caused; adopt the newest impedance to track the data such as electric quantity calculation can obtain comparatively accurate battery internal resistance, because just can acquire the residual capacity that its energy storage structure was calculated to required parameter in using charging pile carries out the charging process, then be difficult to know the capacity that fills electric pile and correspond energy storage structure in advance to the user that does not use charging pile yet, and a plurality of electric piles use simultaneously then can influence the unit power consumption, there is the unable demand that satisfies the charging demand of filling electric pile unit after the waste time waits for, bring the puzzlement for normal use. In order to solve this problem, intensive studies have been necessary.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a monitoring device for an energy storage pile, and aims to optimize the use management of an energy storage structure of a charging pile and increase the use quantity of the charging pile with sufficient unit electric quantity.
In order to achieve the purpose, the invention adopts the following technical scheme:
a monitoring device for an energy storage stack comprises a first wiring group, a second wiring group, a third wiring group, a fourth wiring group, a first electric control switch trigger terminal, a second electric control switch trigger terminal, a sampling control unit and a switch module; the first wiring group, the second wiring group, the third wiring group and the fourth wiring group comprise positive terminals and negative terminals; the sampling control unit comprises a first voltage measuring unit, a second voltage measuring unit, a sampling resistor module, a sampling selector switch, a bus communication module and a control unit; the first voltage measuring unit is connected with the first wiring group and the third wiring group in parallel; the second voltage measuring unit is connected with the second wiring group and the fourth wiring group in parallel; the outputs of the first voltage measuring unit and the second voltage measuring unit are connected with the input of the control unit; the positive terminal of the first wiring group is connected with the positive terminal of the second wiring group through the sampling selector switch and the sampling resistor module; the trigger end or the communication end of the sampling switch is connected with the control unit; the input of the linear amplifying circuit is connected with the sampling resistor module so as to amplify the voltage signal acquired by the sampling resistor module; the output of the linear amplifying circuit is connected with the input of the control unit through the analog-to-digital conversion unit; the bus communication module is in communication connection with the control unit; the first electric control switch trigger terminal and the second electric control switch trigger terminal are connected with the output of the bus communication module in parallel.
Further, the bus communication module comprises one of a CAN communication module, an RS232 communication module and an RS485 communication module.
Further, the device also comprises a trigger unit, wherein the trigger unit comprises one of a switch, a sensor or a communication module.
Further, the system also comprises an interaction device; the interaction device is connected with the control unit.
Further, the sampling resistance module comprises a sampling resistance R1 and a sampling resistance R2 which are connected in series; correspondingly, the linear amplifying circuit comprises a differential amplifying circuit, one input end of the differential amplifying circuit and the sampling resistor R1
The end far away from the sampling resistor R2 is connected, and the other input end of the differential amplifying circuit is connected with the end far away from the sampling resistor R1 of the sampling resistor R2; the connection end of the sampling resistor R1 and the sampling resistor R2 is connected with the reference ground end of the differential amplification circuit.
Further, the control unit stores parameter data of the batteries in the energy storage stack, battery capacity C0 of vehicles of specific models, calibrated standard charging current I0 and standard charging time T0; the parameter data comprise discrete data SOC of battery capacity corresponding to a plurality of battery open-circuit voltages and safe discharge depth residual voltage EV.
Further, the control unit comprises the following sequence steps:
A. sending a trigger signal, disconnecting the sampling change-over switch, and sending a switch-off connection signal to the first electric control switch trigger terminal and/or the second electric control switch trigger terminal;
B. reading the input signal, and acquiring a first wiring group open-circuit voltage Vocv1 transmitted by the first voltage measurement unit and/or a second wiring group voltage open-circuit voltage Vocv2 transmitted by the second voltage measurement unit;
C. sending a trigger signal to enable the sampling changeover switch to be conducted;
D. reading an input signal, acquiring a voltage signal Vu sampled by a sampling resistor module and transmitted by a linear amplifying circuit and an analog-to-digital conversion unit; acquiring a first wiring terminal voltage Vd1 transmitted by a first voltage measurement unit and/or a second wiring terminal voltage Vd2 transmitted by a second voltage measurement unit;
E. calculating the current Iu flowing through the sampling resistance module according to the resistance value of the known sampling resistance module, the corresponding voltage signal Vu and the known amplification factor of the linear amplification circuit;
F. calculating a first internal resistance rd1 and/or a second internal resistance rd 2; wherein, the first internal resistance rd1 is (Vocv1-Vd 1)/Iu; the second internal resistance rd2 is (Vocv2-Vd 2)/Iu;
G. inquiring the first residual electric quantity Soc1 and/or the second residual electric quantity Soc2 according to the measured first wiring group open-circuit voltage Vocv1 and/or second wiring group open-circuit voltage Vocv 2; and calculating a first usable electric quantity RM1 and/or a second usable electric quantity RM2 according to the safety depth of discharge residual electric quantity EV; the voltage retrieval value of the first available electric quantity is Vocv1-I0 rd1, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a first remaining electric quantity SOC 1; the voltage retrieval value of the second available electric quantity is Vocv2-I0 rd2, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a second residual electric quantity SOC 2;
H. sending out a trigger signal to disconnect the sampling change-over switch;
I. according to the battery capacity C0 or the standard charging current I0 and the standard charging time T0 of the storage model vehicle, performing division calculation by combining the first available electric quantity RM1 and the second available electric quantity RM2, taking the integer part of the division result as the safe charging times, comparing the safe charging times with the charging pile number, and when the safe charging times are larger than the charging pile number, determining the available charging pile number as the charging pile number, otherwise, determining the available charging pile number as the safe charging times;
J. and sending a safe charging time control signal to an external display device and/or an external intelligent switch.
Before the energy storage pile is used, the energy storage pile is required to be specially set, namely the energy storage pile is divided into a first energy storage module and a second energy storage module, on one hand, under the normal condition, one of the energy storage units is connected with a bus in parallel, so that the capacity expansion and the voltage stabilization of a charging pile are realized, the control unit controls the two energy storage units to be alternately connected into the bus in parallel, the time for connecting different energy storage units into the bus in parallel can be properly prolonged, the charging management frequency of the energy storage units is favorably reduced, and the energy consumption is reduced; when the outage, the energy storage unit of parallelly connected generating line can incessantly provide electric energy output, and important on the other hand helps realizing that the energy storage unit of parallelly connected generating line and the energy storage unit of not parallelly connected generating line realize the differentiation on the stored energy to can be by the energy storage unit of relatively high electric quantity to the energy storage unit transmission electric charge of relatively low electric quantity. When the energy-saving switch is used, the first wiring group is connected with the first energy storage module, and the second wiring group is connected with the second energy storage module; the first voltage measuring unit and the second voltage measuring unit respectively obtain the open-circuit voltage and the terminal voltage changes of the first wiring set (the first energy storage module) and the second wiring set (the second energy storage module) and the current formed by charge transmission among the energy storage units, thereby calculating the internal resistance of the energy storage units, and according to the sampling voltage which is stored by the control unit and is generated by the transmission of the charge through the sampling resistance module, the input of the control unit is processed by the proportional amplification and analog-to-digital conversion unit of the linear amplification circuit; the control unit obtains the charging current between the two energy storage units through the resistance values of the sampling voltage and the sampling resistance module, the internal resistance of the energy storage units is calculated through the charging current, the stored battery capacity C0 is combined, the standard charging current is I0, the standard charging time is T0, the battery open-circuit voltage corresponds to the discrete data of the battery capacity, the safe charging times are calculated according to the parameter data such as the safe discharging depth residual electricity EV, the maximum charging pile number capable of being normally used is obtained through comparison with the charging pile number, the use management of the energy storage structure of the optimized charging pile is realized, and the charging pile use number of the sufficient unit electric quantity is increased.
Compared with the prior art, the method and the device combine the optimization of the energy storage structure, utilize the energy storage structure as an auxiliary unit for monitoring the electric quantity, simplify the design of the electric quantity monitoring unit, do not need to establish a complex model related to temperature and aging on the internal resistance of an energy storage unit, take actual measurement as the standard, and further calculate the maximum charging pile number, thereby facilitating charging users to master related information, and facilitating managers to reasonably schedule and manage charging equipment and charging demand customers. The designed first electric control switch terminal and the second electric control switch terminal can adjust the matching power or specification of the connected switches according to needs, and the flexibility is high.
Drawings
Fig. 1 is a logic block diagram of a circuit for an energy storage stack monitoring device in an embodiment.
Fig. 2 is a logic block diagram of a circuit applied to the charging pile system according to the embodiment.
Fig. 3 is a schematic diagram of the connection of the linear amplifying circuit in the embodiment.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
A monitoring device for an energy storage stack is shown in figure 1 and comprises a first wiring group, a second wiring group, a third wiring group, a fourth wiring group, a redundant wiring group, a first electric control switch trigger terminal, a second electric control switch trigger terminal, a sampling control unit and a switch module; the first wiring group, the second wiring group, the third wiring group and the fourth wiring group comprise positive terminals and negative terminals; the sampling control unit comprises a first voltage measuring unit, a second voltage measuring unit, a sampling resistor module, a sampling selector switch, a bus communication module, an interaction device, a trigger unit and a control unit; the first voltage measuring unit is connected with the first wiring group and the third wiring group in parallel; the second voltage measuring unit is connected with the second wiring group and the fourth wiring group in parallel; the outputs of the first voltage measuring unit and the second voltage measuring unit are connected with the input of the control unit; the positive terminal of the first wiring group is connected with the positive terminal of the second wiring group through the sampling selector switch and the sampling resistor module; the trigger end or the communication end of the sampling switch is connected with the control unit; the input of the linear amplifying circuit is connected with the sampling resistor module so as to amplify the voltage signal acquired by the sampling resistor module; the output of the linear amplifying circuit is connected with the input of the control unit through the analog-to-digital conversion unit; the bus communication module is in communication connection with the control unit; the first electric control switch trigger terminal and the second electric control switch trigger terminal are connected with the output of the bus communication module in parallel; the redundant switch wiring group comprises a plurality of communication wiring terminals, and each communication wiring terminal is connected with the output of the bus communication module; the interactive device is connected with the control unit, the interactive device is a touch screen or the combination of an input keyboard and a display device, wherein the display device can be completed by an LED screen, an LCD screen or indicator lamps with the same quantity as the charging piles so as to realize quantity display of the available charging piles.
When the intelligent bus bar is used, the first wiring group is connected with an external first energy storage module, the second wiring group is connected with an external second energy storage module, the third wiring group is connected with a bus through an intelligent relay switch, and the fourth wiring group is connected with the bus through the intelligent relay switch; the communication ends of the redundant switch wiring group are respectively connected with the communication ends of a plurality of external intelligent relays one by one, and the connected intelligent relay switches are respectively used as bus access switches to be connected between the charging pile input and the buses;
the equivalent circuit when in use is as shown in fig. 2 (non-functional components such as wiring sets are omitted), and the input of the charging device is connected with mains supply; the input of 5 charging piles is correspondingly connected with the bus through bus access switches KA1-KA5 (in the embodiment, the number of the charging piles is 5, and the number can be adjusted during actual use), wherein the positive pole of the energy storage pile is connected with the bus +, and the negative pole of the energy storage pile is connected with the bus-; the energy storage stack comprises a first energy storage module, a second energy storage module, an external switch, a first electric control switch K1 and a second electric control switch K2; each bus access switch KA1-KA5, the first electric control switch K1 and the second electric control switch K2 are intelligent circuit breakers (existing commercial products) based on a CAN bus, on one hand, bus expansion of the switches is convenient to achieve, the bus access switches are connected to a control unit, saving of ports of the control unit is facilitated, on the other hand, each intelligent circuit breaker is convenient to control, and a communication end is a trigger end or a control end of each switch; the first voltage measuring unit U1 and the second voltage measuring unit U2 use electric meters in serial port communication so as to realize simplification of interfaces and information transmission; the first energy storage module is connected with the bus through a first electric control switch K1; the second energy storage module is connected with the bus through a second electric control switch K2; the first voltage measuring unit U1 is connected in parallel with the output end of the first energy storage module; the second voltage measuring unit U2 is connected in parallel with the output end of the second energy storage module; the outputs of the first voltage measuring unit U1 and the second voltage measuring unit U2 are connected with the input of the control unit; the output end of the first energy storage module is connected with the second energy storage module through the sampling changeover switch K3 and the sampling resistor module; the trigger end or the control end of the first electric control switch K1, the trigger end or the control end of the second electric control switch K2 and the trigger end or the communication end of the sampling changeover switch are connected with the control unit; the input of the linear amplifying circuit is connected with the sampling resistor module so as to amplify the voltage signal acquired by the sampling resistor module; the output of the linear amplifying circuit is connected with the input of the control unit through the analog-to-digital conversion unit; the communication unit is in communication connection with the control unit; the trigger unit is electrically connected with the control unit; the trigger unit comprises one of a switch, a sensor or a communication module. The sensors comprise radar sensors, photoelectric sensors, weight sensors and the like, and are used for being arranged at an entrance of a vehicle or a to-be-charged area when in use, so that the vehicle to be charged is detected to enter a detection area and then signals are transmitted to start the functions of electric quantity monitoring and switch switching, and a control sequence step is executed; the trigger unit may also use an RF communication module or a manual switch, and may also perform the same function. .
As shown in fig. 3, the sampling resistor module includes a sampling resistor R1 and a sampling resistor R2 connected in series; correspondingly, the linear amplifying circuit comprises a differential amplifying circuit which is built by U1, one input end of the differential amplifying circuit is connected with one end, far away from the sampling resistor R2, of the sampling resistor R1, and the other input end of the differential amplifying circuit is connected with one end, far away from the sampling resistor R1, of the sampling resistor R2; the connection end of the sampling resistor R1 and the sampling resistor R2 is connected with the reference ground end of the differential amplification circuit; in fig. 2, the first energy storage module is V1, the second energy storage module is V2, the battery BA1 and the battery BA2 are power supply circuits of the linear amplification circuit, and the output end out1 of the differential circuit is connected to the input of the analog-to-digital conversion unit; when the sampling change-over switch K3 is closed, first energy storage module V1, the electric quantity transmission between the second energy storage module V2 is at sampling resistor R1, sampling voltage has been formed on sampling resistor R2, no matter by first energy storage module V1 flow to second energy storage module V2 or reverse charging, setting through difference amplifier circuit, the two-way collection of the floating voltage on the sampling resistor module has been realized, the direction of electric current can be demonstrated to the positive and negative value of voltage output, the energy storage module that has realized the inflow electric charge and the discernment of the energy storage module that flows out the electric charge, the subsequent processing of the control unit of being convenient for. The sampling change-over switch comprises an MOS tube so as to control and save installation space;
the control unit stores parameter data of batteries in the energy storage stack, battery capacity C0 and/or standard charging current I0 and standard charging time T0 of vehicles of a plurality of specific models; the parameter data comprise discrete data of battery capacity corresponding to a plurality of battery open-circuit voltages and residual electric quantity EV of safe discharge depth; the corresponding parameter data can be adjusted or updated through the network communication module, so that the use of the charging pile or the energy storage pile can be managed more accurately and reasonably; when the linear amplifier is used, the control unit also needs to store the amplification coefficient and the error adjustment coefficient of the linear amplifier circuit.
The control unit comprises the following sequential steps:
A. sending a trigger signal, and sending a switch-off connection signal to a first electric control switch trigger terminal and/or a second electric control switch trigger terminal so as to disconnect the sampling change-over switch, the first electric control switch and/or the second electric control switch;
B. reading the input signal, and acquiring a first wiring group open-circuit voltage Vocv1 transmitted by the first voltage measurement unit and/or a second wiring group voltage open-circuit voltage Vocv2 transmitted by the second voltage measurement unit;
C. sending a trigger signal to enable the sampling changeover switch to be conducted;
D. reading an input signal, acquiring a voltage signal Vu sampled by a sampling resistor module and transmitted by a linear amplifying circuit and an analog-to-digital conversion unit; acquiring a first wiring terminal voltage Vd1 transmitted by a first voltage measurement unit and/or a second wiring terminal voltage Vd2 transmitted by a second voltage measurement unit;
E. calculating the current Iu flowing through the sampling resistance module according to the resistance value of the known sampling resistance module, the corresponding voltage signal Vu and the known amplification factor of the linear amplification circuit;
F. calculating a first internal resistance rd1 and/or a second internal resistance rd 2; wherein, the first internal resistance rd1 is (Vocv1-Vd 1)/Iu; the second internal resistance rd2 is (Vocv2-Vd 2)/Iu;
G. inquiring the first residual electric quantity Soc1 and/or the second residual electric quantity Soc2 according to the measured first wiring group open-circuit voltage Vocv1 and/or second wiring group open-circuit voltage Vocv 2; and calculating a first usable electric quantity RM1 and/or a second usable electric quantity RM2 according to the safety depth of discharge residual electric quantity EV; the voltage retrieval value of the first available electric quantity is Vocv1-I0 rd1, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a first remaining electric quantity SOC 1; the voltage retrieval value of the second available electric quantity is Vocv2-I0 rd2, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a second residual electric quantity SOC 2;
H. sending out a trigger signal to disconnect the sampling change-over switch;
I. according to the battery capacity C0 or the standard charging current I0 and the standard charging time T0 of the storage model vehicle, performing division calculation by combining the first available electric quantity RM1 and the second available electric quantity RM2, taking the integer part of the division result as the safe charging times, comparing the safe charging times with the charging pile number, and when the safe charging times are larger than the charging pile number, determining the available charging pile number as the charging pile number, otherwise, determining the available charging pile number as the safe charging times;
J. and sending a safe charging time control signal to the bus communication module and/or the interaction device.
The product of the current and the duration and the conversion of the electric quantity are the prior art and are not described herein again. In order to realize convenient control, the control unit can use an ARM embedded processor or a DSP digital signal processing chip.
In addition, the control unit can send switching signals to the first electric control switch wiring end and the second electric control switch wiring end during the period of mains supply by setting time parameters or electric quantity parameters, so that the first electric control switch and the second electric control switch are alternately connected to the bus end, and the capacity expansion and voltage stabilization functions of the power supply of the charging pile and the charging function of the energy storage pile are realized.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A monitoring device for an energy storage stack, characterized by: the system comprises a first wiring group, a second wiring group, a third wiring group, a fourth wiring group, a first electric control switch trigger terminal, a second electric control switch trigger terminal, a sampling control unit and a switch module; the first wiring group, the second wiring group, the third wiring group and the fourth wiring group comprise positive terminals and negative terminals; the sampling control unit comprises a first voltage measuring unit, a second voltage measuring unit, a sampling resistor module, a sampling selector switch, a bus communication module and a control unit; the first voltage measuring unit is connected with the first wiring group and the third wiring group in parallel; the second voltage measuring unit is connected with the second wiring group and the fourth wiring group in parallel; the outputs of the first voltage measuring unit and the second voltage measuring unit are connected with the input of the control unit; the positive terminal of the first wiring group is connected with the positive terminal of the second wiring group through the sampling selector switch and the sampling resistor module; the trigger end or the communication end of the sampling switch is connected with the control unit; the input of the linear amplifying circuit is connected with the sampling resistor module so as to amplify the voltage signal acquired by the sampling resistor module; the output of the linear amplifying circuit is connected with the input of the control unit through the analog-to-digital conversion unit; the bus communication module is in communication connection with the control unit; the first electric control switch trigger terminal and the second electric control switch trigger terminal are connected with the output of the bus communication module in parallel.
2. A monitoring device for an energy storage stack according to claim 1, characterized in that: the bus communication module comprises one of a CAN communication module, an RS232 communication module and an RS485 communication module.
3. A monitoring device for an energy storage stack according to any of claims 1 or 2, characterized in that: also comprises an interaction device; the interaction device is connected with the control unit.
4. A monitoring device for an energy storage stack according to claim 1, characterized in that: the sampling resistance module comprises a sampling resistance R1 and a sampling resistance R2 which are connected in series; correspondingly, the linear amplifying circuit comprises a differential amplifying circuit, one input end of the differential amplifying circuit is connected with one end, far away from the sampling resistor R2, of the sampling resistor R1, and the other input end of the differential amplifying circuit is connected with one end, far away from the sampling resistor R1, of the sampling resistor R2; the connection end of the sampling resistor R1 and the sampling resistor R2 is connected with the reference ground end of the differential amplification circuit.
5. A monitoring device for an energy storage stack according to claim 3, characterized in that: the control unit stores parameter data of batteries in the energy storage pile, the number of charging piles, the battery capacity C0 of vehicles of specific models, a calibrated standard charging current I0 and a standard charging time T0; the parameter data comprise discrete data SOC of battery capacity corresponding to a plurality of battery open-circuit voltages and safe discharge depth residual voltage EV.
6. A monitoring device for an energy storage stack according to claim 5, characterized in that: the control unit comprises the following sequential steps:
A. sending a trigger signal, disconnecting the sampling change-over switch, and sending a switch-off connection signal to the first electric control switch trigger terminal and/or the second electric control switch trigger terminal;
B. reading the input signal, and acquiring a first wiring group open-circuit voltage Vocv1 transmitted by the first voltage measurement unit and/or a second wiring group voltage open-circuit voltage Vocv2 transmitted by the second voltage measurement unit;
C. sending a trigger signal to enable the sampling changeover switch to be conducted;
D. reading an input signal, acquiring a voltage signal Vu sampled by a sampling resistor module and transmitted by a linear amplifying circuit and an analog-to-digital conversion unit; acquiring a first wiring terminal voltage Vd1 transmitted by a first voltage measurement unit and/or a second wiring terminal voltage Vd2 transmitted by a second voltage measurement unit;
E. calculating the current Iu flowing through the sampling resistance module according to the resistance value of the known sampling resistance module, the corresponding voltage signal Vu and the known amplification factor of the linear amplification circuit;
F. calculating a first internal resistance rd1 and/or a second internal resistance rd 2; wherein, the first internal resistance rd1 is (Vocv1-Vd 1)/Iu; the second internal resistance rd2 is (Vocv2-Vd 2)/Iu;
G. inquiring the first residual electric quantity Soc1 and/or the second residual electric quantity Soc2 according to the measured first wiring group open-circuit voltage Vocv1 and/or second wiring group open-circuit voltage Vocv 2; and calculating a first usable electric quantity RM1 and/or a second usable electric quantity RM2 according to the safety depth of discharge residual electric quantity EV; the voltage retrieval value of the first available electric quantity is Vocv1-I0 rd1, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a first remaining electric quantity SOC 1; the voltage retrieval value of the second available electric quantity is Vocv2-I0 rd2, and the voltage value is used as a battery open-circuit voltage value to retrieve corresponding battery capacity discrete data to obtain a second residual electric quantity SOC 2;
H. sending out a trigger signal to disconnect the sampling change-over switch;
I. according to the battery capacity C0 or the standard charging current I0 and the standard charging time T0 of the storage model vehicle, performing division calculation by combining the first available electric quantity RM1 and the second available electric quantity RM2, taking the integer part of the division result as the safe charging times, comparing the safe charging times with the charging pile number, and when the safe charging times are larger than the charging pile number, determining the available charging pile number as the charging pile number, otherwise, determining the available charging pile number as the safe charging times;
J. and sending a safe charging time control signal to the bus communication module and/or the interaction device.
7. A monitoring device for an energy storage stack according to claim 6, characterized in that: the trigger unit is electrically connected with the control unit; the trigger unit comprises one of a switch, a sensor or a communication module.
8. A monitoring device for an energy storage stack according to claim 1, characterized in that: the sampling switch comprises an MOS tube.
9. A monitoring device for an energy storage stack according to claim 1, characterized in that: the system also comprises a redundant switch wiring group; the redundant switch wiring group comprises a plurality of communication terminals, and each communication terminal is connected with the output of the bus communication module.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138316A (en) * | 2011-11-30 | 2013-06-05 | 威海中创国际贸易有限公司 | Electric car charger |
| CN103151820A (en) * | 2013-03-26 | 2013-06-12 | 上海大学 | Mobile energy storage battery electric vehicle charging system |
| CN103825351A (en) * | 2014-02-24 | 2014-05-28 | 广西电网公司电力科学研究院 | Intelligent energy storage type emergency power supply system |
| CN105356528A (en) * | 2015-10-19 | 2016-02-24 | 国网河南省电力公司电力科学研究院 | Battery management system |
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| US7547990B2 (en) * | 2005-07-12 | 2009-06-16 | Diran Varzhabedian | Backup power system for electrical appliances |
| US8519566B2 (en) * | 2006-03-28 | 2013-08-27 | Wireless Environment, Llc | Remote switch sensing in lighting devices |
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| CN103138316A (en) * | 2011-11-30 | 2013-06-05 | 威海中创国际贸易有限公司 | Electric car charger |
| CN103151820A (en) * | 2013-03-26 | 2013-06-12 | 上海大学 | Mobile energy storage battery electric vehicle charging system |
| CN103825351A (en) * | 2014-02-24 | 2014-05-28 | 广西电网公司电力科学研究院 | Intelligent energy storage type emergency power supply system |
| CN105356528A (en) * | 2015-10-19 | 2016-02-24 | 国网河南省电力公司电力科学研究院 | Battery management system |
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