CN110932357A - Energy storage device - Google Patents
Energy storage device Download PDFInfo
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- CN110932357A CN110932357A CN201911293973.8A CN201911293973A CN110932357A CN 110932357 A CN110932357 A CN 110932357A CN 201911293973 A CN201911293973 A CN 201911293973A CN 110932357 A CN110932357 A CN 110932357A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
Abstract
The utility model relates to an energy storage device, including battery module, battery management device, bidirectional converter, main loop switch device, detection device and force recovery switch device, bidirectional converter's generating line side is used for connecting direct current bus and power generation facility, and the battery module is connected through main loop switch device to the battery side, still connects the battery module through forcing recovery switch device, and detection device and main loop switch device all connect battery management device, and detection device connects the battery module. Above-mentioned energy memory, when detecting that the voltage value is less than the system protection value, the disconnection of major loop switching device, when needs energy memory reworking, accessible closed forces to resume switching device and forces energy memory to resume, has improved energy memory's use reliability.
Description
Technical Field
The application relates to the technical field of battery energy storage, in particular to an energy storage device.
Background
With the national emphasis on new energy, smart energy, energy storage and other industries or fields, these industries have gained rapid development in recent years, and various types of power generation devices, which are increasingly prosperous, and the development of industries combining energy storage devices and power generation devices are urging to grow. The existing energy storage device mainly charges a battery through a power grid system and a power generation device, and discharges the battery through a load, so that the storage and the use of electric energy are realized.
The charge and discharge management of the battery is an important link for the management of the energy storage device, and the quality of the design of the charge and discharge management method of the battery directly determines the safety and the use efficiency of the energy storage device. Traditional energy memory is when using, thereby energy management system sends the charge-discharge of charge-discharge instruction control battery for lower extreme equipment, nevertheless when energy management system and lower extreme equipment communication abnormal appearance, can make lower extreme equipment not accept the upper instruction, the long-term standby of battery is shelved, the light current consumption exists always, take place the excessive discharge phenomenon very easily, discharge when ending battery residual capacity is less than and prescribes a limit to the guard value lower limit, the system starts protect function, energy memory stop work, thereby can't start the charge, the operation of recovery system, traditional energy memory uses the reliability low.
Disclosure of Invention
In view of the above, it is necessary to provide an energy storage device to solve the problem of low reliability of the conventional energy storage device.
An energy storage device comprises a battery module, a battery management device, a bidirectional converter, a main loop switch device, a detection device and a forced recovery switch device, wherein the bus side of the bidirectional converter is used for connecting a direct current bus and a power generation device, the battery side of the bidirectional converter is connected with the battery module through the main loop switch device, the battery side of the bidirectional converter is further connected with the battery module through the forced recovery switch device, the detection device and the main loop switch device are both connected with the battery management device, and the detection device is connected with the battery module.
Above-mentioned energy memory, detection device detects the magnitude of voltage of battery module and sends to battery management device, battery management device controls the on-state of major loop switching device according to the magnitude of voltage, start protect function when detecting the magnitude of voltage and being less than system's protective value, control major loop switching device disconnection, when needing energy memory reworking, accessible closure forces recovery switching device to force energy memory to resume, make battery module and bidirectional converter switch on, the condition that energy memory can't be used when having avoided the voltage of battery module to hang down, energy memory's use reliability has been improved.
Drawings
FIG. 1 is a block diagram of an embodiment of an energy storage device;
FIG. 2 is a block diagram of an energy storage device according to another embodiment;
FIG. 3 is a block diagram of an energy storage device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described more fully below by way of examples in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In an embodiment, please refer to fig. 1, which provides an energy storage device, including a battery module 310, a battery management device 200, a bidirectional converter 330, a main circuit switch device 320, a detection device 100, and a forced recovery switch device 400, where a bus side of the bidirectional converter 330 is used to connect a dc bus and a power generation device, a battery side of the bidirectional converter 330 is connected to the battery module 310 through the main circuit switch device 320, the battery side of the bidirectional converter 330 is further connected to the battery module 310 through the forced recovery switch device 400, both the detection device 100 and the main circuit switch device 320 are connected to the battery management device 200, and the detection device 100 is connected to the battery module 310. When the amount of electricity stored by the energy storage device is within 20kWh, the energy storage device is generally limited to common household occasions. The battery management device 200 controls the conduction state of the main loop switch device 320 according to the voltage value, when the voltage value is detected to be lower than the system protection value, the protection function is started, the main loop switch device 320 is controlled to be disconnected, when the energy storage device needs to work again, the energy storage device can be forcibly recovered by closing the forcible recovery switch device 400, so that the battery module 310 is conducted with the bidirectional converter 330, the condition that the energy storage device cannot be used when the voltage of the battery module 310 is too low is avoided, and the use reliability of the energy storage device is improved.
Specifically, the bus side of the bidirectional converter 330 is connected to the dc bus and the power generation device, the battery side of the bidirectional converter 330 is connected to the battery module 310 through the main circuit switch device 320, and the bidirectional converter 330 can not only access electric energy from the power generation device and the dc bus side, but also transmit the electric energy discharged from the battery module 310 to the dc bus. The bidirectional converter 330 is integrated in the energy storage device and functions as a battery charger. The control of the charging and discharging states of the energy storage device can be achieved by controlling the working state of the bidirectional converter 330, the bidirectional converter 330 can be a DC/DC bidirectional converter 330, electric energy from a direct current bus side is generated during working, the voltage of the bus side is higher than the total voltage of the battery side through DC/DC voltage conversion, the effect of charging the battery module 310 is achieved, during discharging, an inductance element in the DC/DC converter is boosted, the voltage of the electric energy of the battery module 310 is higher than the bus side after DC/DC conversion, and the effect of storing the electric energy is achieved. The number of the battery modules 310 is not unique, and when the number of the battery modules 310 is two or more, the respective battery modules 310 are sequentially connected in series. The bidirectional converter 330 may also obtain electric energy from a power generation device, and the type of the power generation device is not unique, for example, the power generation device may be a Photovoltaic (PV) power generation device, the PV power generation device may convert received light energy into electric energy, the use cost is low, and the power generation device may also be other types of devices as long as those skilled in the art think it can be implemented.
The type of the battery management apparatus 200 is not exclusive, and may be a device capable of implementing a control function, such as a single chip microcomputer, as long as the device is considered to be implemented by those skilled in the art. The basis for controlling the operating state of the bidirectional converter 330 is not unique, for example, the charging/discharging state of the energy storage device may be controlled according to the voltage value of the battery module 310 detected by the detection device 100, when the voltage value of the battery module 310 is lower than the lower limit of the preset voltage, the bidirectional converter 330 is controlled to charge the battery module 310, and when the voltage value of the battery module 310 is higher than the upper limit of the preset voltage, the battery module 310 is controlled to discharge, so that the energy storage device operates reliably. Or, the charging and discharging state of the energy storage device can be controlled according to the peak-valley price time logic, specifically, the electricity consumption peak time period 11:30-14:00, the electricity consumption peak time period 18:00-20:00 and the electricity consumption general time period of the commercial power existing time are different, and the price difference of the two time periods is very different in some places, so that the energy storage device can charge the battery module 310 in the electricity consumption general time period, the electric energy stored in the battery module 310 is preferentially used in the electricity consumption peak time period, the surplus electric energy can be distributed to the power grid to participate in peak regulation, and the charging and discharging state of the energy storage device is controlled according to the peak-valley price time logic, so that the work of the energy storage device can meet the requirements of users.
The detection device 100 is connected to the battery module 310, the structure of the detection device 100 is not unique, for example, the detection device may be a voltage collection line, and specifically, the detection device may be connected to the tabs of the battery module 310, and the connection manner between the detection device 100 and the battery module 310 is not unique, for example, the detection device may be connected to the tabs of the battery module 310 by welding, and the detection device is fixed in position and reliable in use. The detection device 100 is configured to detect a voltage value of the battery module 310 and send the voltage value to the battery management device 200, when the voltage value is lower than a system protection value, the energy storage device starts a protection function, the battery management device 200 controls the main circuit switch device 320 to be turned off, after the main circuit switch device 320 is turned off, the battery management device 200 is difficult to turn on the main circuit switch device 320 by sending a control command, and at this time, the energy storage device is in a state of stopping working, and when the energy storage device needs to work again, the energy storage device can be forcibly restored by turning on the forcible restoration switch device 400, so that the battery module 310 and the bidirectional converter 330 are turned on. The type of the forced recovery switching device 400 is not unique, and may be a physical breaker switch, an electronic control device, or the like, and the forced recovery switching device 400 may be closed in a manual operation manner, so that the battery module 310 and the bidirectional converter 330 are turned on, and the energy storage device may still be charged and discharged completely, thereby achieving the effect of prolonging the service life of the energy storage device. Alternatively, an electronically controlled device may be used as the forced recovery switching device 400, and the forced recovery switching device 400 switches the on or off state thereof according to the received control command, for example, when the battery management device 200 detects that the voltage value of the battery module 310 is lower than the system protection value and the main circuit switching device 320 is turned off, the battery management device may send a closing command to the forced recovery switching device 400 to close the forced recovery switching device, so as to recover the energy storage device to work, thereby improving the automation degree of the energy storage device.
In one embodiment, referring to fig. 2, the main circuit switch device 320 includes a main positive circuit switch device 322 and a main negative circuit switch device 324, the main positive circuit switch device 322 and the main negative circuit switch device 324 are respectively disposed on the first branch L1 and the second branch L2, control terminals of the main positive circuit switch device 322 and the main negative circuit switch device 324 are connected to the battery management device 200, the first branch L1 is connected to the battery module 310 and the bidirectional converter 330, the second branch L2 is connected to the battery module 310 and the bidirectional converter 330, two contacts of the first contact pair of the forced recovery switch device 400 are respectively connected to two ends of the main positive circuit switch device 322 on the first branch L1, and two contacts of the second contact pair of the forced recovery switch device 400 are respectively connected to two ends of the main negative circuit switch device on the second branch L2. The main positive circuit switching device 322 and the main negative circuit switching device 324 respectively control the on-off of circuits on different branches, two pairs of contacts of the forced recovery switching device 400 are respectively connected in parallel with the main positive circuit switching device 322 and the main negative circuit switching device 324, and when the main positive circuit switching device 322 or the main negative circuit switching device 324 is disconnected, the corresponding branches can be switched on by closing the corresponding contacts of the forced recovery switching device 400, so that the energy storage device can recover charging and discharging.
Specifically, the main positive circuit switch device 322 and the main negative circuit switch device 324 are respectively disposed in a first branch L1 and a second branch L2, the first branch L1 is connected to the negative electrode of the battery module 310 and the bidirectional converter 330, the second branch L2 is connected to the positive electrode of the battery module 310 and the bidirectional converter 330, the main positive circuit switch device 322 and the main negative circuit switch device 324 each include a control end, a first end and a second end, the control end of the main positive circuit switch device 322 and the control end of the main negative circuit switch device 324 are both connected to the battery management device 200, whether the first end and the second end are conducted or not is switched according to a control command sent by the battery management device 200, two contacts of the first contact pair of the forced recovery switch device 400 are respectively connected to two ends of the main positive circuit switch device 322 located on the first branch L1, that is the first end and the second end of the main positive circuit switch device 322, and two contacts of the second contact pair of the forced recovery switch device 400 are respectively connected to the main negative circuit switch device located on the second branch L35 Two terminals of L2, a first terminal and a second terminal of the main negative loop switch device 324.
When one of the main positive circuit switch device 322 and the main negative circuit switch device 324 is turned off, the battery module 310 and the bidirectional converter 330 are turned off, and when both the main positive circuit switch device 322 and the main negative circuit switch device 324 are turned on, current can be transmitted between the battery module 310 and the bidirectional converter 330, so that the safety of the circuit is improved. The main positive circuit switch device 322 and the main negative circuit switch device 324 are arranged in the energy storage device, and can be timely disconnected when the battery side of the bidirectional converter 330 is abnormal, so that the circuit device is protected, and the service life of the energy storage device is prolonged. In an extensible manner, the battery management device 200 may control the conduction states of the main positive circuit switching device 322 and the main negative circuit switching device 324 according to the voltage value of the battery module 310 detected by the detection device 100, may also control the conduction states of the main positive circuit switching device 322 and the main negative circuit switching device 324 according to the operating parameters such as the temperature of the energy storage device and the withstand voltage resistance, and may cut off the circuit in time when the operating parameters are abnormal, so as to prevent further damage to the circuit.
The number of contact pairs of the forced recovery switching device 400 is not unique, and in this embodiment, the number of contact pairs of the forced recovery switching device 400 is two, the first contact pair is respectively connected to the two ends of the main positive circuit switching device 322 in the first branch L1, the second contact pair is respectively connected to the two ends of the main negative circuit switching device 324 in the second branch L2, when at least one of the main positive circuit switching device 322 or the main negative circuit switching device 324 is opened, the corresponding contact pair of the forced recovery switching device 400 can be closed, or all the contact pairs of the forced recovery switching device 400 can be closed, so that the energy storage device can be recovered to operate, and the use is reliable.
In one embodiment, referring to fig. 2, the energy storage device further includes a power module 340, and the power module 340 is connected to the first branch L1 and the second branch L2. In this embodiment, the power module 340 may be connected to the battery management device 200, and output the converted weak current to the battery management device 200, so that the battery management device 200 can work normally. The type of the power module 340 is not unique, in this embodiment, the power module 340 is a 24V power module, the 24V power module can be configured with at most 24 modes, each loop can be configured with automatic control or percentage control, and the use is convenient. It is understood that in other embodiments, other types of power modules 340 may be used, as deemed practicable by those skilled in the art.
In one embodiment, the energy storage device further includes a pre-charge switching device connected in parallel with the main positive loop switching device 322, and a weak side switching device connected to the first branch L1 at one end and the power module 340 at the other end.
Specifically, when the pre-charge switch device is closed, the battery module 310 and the bidirectional converter 330 are connected, so that pre-charging of the battery module 310 can be realized, the use is convenient, the power module 340 is connected with the battery module 310 through the weak current side switch device, and when the weak current side switch device is connected, the power module 340 is connected with the battery module 310, so that electric energy transmission can be normally realized with the battery module 310. The pre-charging switch device and the weak current side switch device are arranged in the energy storage device, and can be timely disconnected when the battery side of the bidirectional converter 330 is abnormal, so that the circuit device is protected, and the service life of the energy storage device is prolonged. In an extensible manner, the battery management device 200 may control the conduction states of the pre-charge switch device and the weak side switch device according to the voltage value of the battery module 310 detected by the detection device 100, and may also control the conduction states of the pre-charge switch device and the weak side switch device according to the working parameters such as the temperature of the energy storage device and the dielectric breakdown impedance, and the circuit may be cut off in time when the working parameters are abnormal, so as to prevent further damage to the circuit.
In one embodiment, the main positive circuit switching device 322, the main negative circuit switching device 324, the pre-charge switching device, and the weak side switching device are all dc contactors. The pre-charge switch device and the weak current side switch device also comprise control ends, a first end and a second end, the control ends of the pre-charge switch device and the weak current side switch device are both connected with the battery management device 200, the first end of the pre-charge switch device is connected with the first end of the main positive loop switch device 322, the second end of the pre-charge switch device is connected with the second end of the main positive loop switch device 322, the first end of the weak current side switch device is connected with the first branch L1, and the second end of the weak current side switch device is connected with the power module 340. Because the energy storage device is an all-direct-current electrical system, the main positive circuit switching device 322, the main negative circuit switching device 324, the pre-charging switching device and the weak current side switching device are all direct-current contactors, so that the normal operation of the energy storage device can be guaranteed. Further, the pre-charge switch device and the weak current side switch device are dc contactors without auxiliary contacts, as long as the on/off of the circuit can be controlled, the main positive circuit switch device 322 and the main negative circuit switch device 324 are dc contactors with auxiliary contacts, and the auxiliary contacts and the main contacts simultaneously act to control the on/off of the circuit, so that the safety of the circuit can be improved. The dc contactor is disposed in the energy storage device, and plays a role of protecting devices in the device when the battery side of the bidirectional converter 330 is abnormal, and the on or off state of the dc contactor is switched according to the detection and judgment of the battery management device 200 on the system operation state, thereby improving the reliability of the energy storage device. It is understood that in other embodiments, the main positive loop switch device 322, the main negative loop switch device 324, the pre-charge switch device, and the weak side switch device may be other types of devices, as deemed practicable by those skilled in the art.
In one embodiment, the energy storage device further includes a fuse 350, the fuse 350 being connected in series to the first branch L1. The fuse 350 is a protection element in the energy storage device, and when the conditions such as overcurrent or overvoltage occur in the energy storage device, especially when the first branch L1 where the battery module 310 and the main positive loop switching device 322 are located has the conditions of overcurrent or overvoltage, the fuse 350 fuses the melt by heat generated by itself, so as to break the circuit, avoid the overload operation of the energy storage device, play a role in protecting each device in the energy storage device, and improve the use reliability of the energy storage device. The specific type of fuse 350 is not exclusive and may be selected according to practical needs, as long as one skilled in the art can realize it.
In one embodiment, the energy storage device further comprises a shunt 360, the shunt 360 being connected in series to the second branch L2. The shunt 360 is a standard resistance block which is strictly calibrated, and specifically may be a copper sheet with a standard resistance value, when a current passes through, a direct current may be measured by a deviation value of voltage at two front and rear points of the shunt 360 and a resistance of the shunt, and a calculation formula is as follows:
I＝△v/R
furthermore, the shunt 360 is connected with the battery management device 200 and can be used for collecting the current of the energy storage device under the control of the battery management device 200, so that the battery management device 200 can complete the management of the devices such as the battery module 310 and the like according to the collected current, and the use reliability of the energy storage device is improved.
In one embodiment, the energy storage device further includes a breaker QF1, and the first branch L1 and the second branch L2 are connected to the battery module 310 through the breaker QF 1. Specifically, the fuse 350 in the first branch L1 and the shunt 360 in the second branch L2 are respectively connected to different contact pairs of the breaker QF1, and can be used to distribute electric energy to protect the circuit, and when the circuit has serious overload or short circuit and under-voltage faults, the circuit can be automatically cut off, specifically, when the circuit has short circuit or serious overload, the armature of the over-current release is attracted to make the free release mechanism operate, the main contact breaks the main circuit, when the circuit is overloaded, the thermal element of the thermal release heats to bend the bimetallic strip to push the free release mechanism to operate, when the circuit is undervoltage, the armature of the undervoltage release is released, and the free release mechanism also operates. The circuit can be disconnected under the abnormal conditions of the circuits, the overload operation of the energy storage device is avoided, the function of protecting each device in the energy storage device is achieved, and the use reliability of the energy storage device is improved. The specific type of circuit breaker QF1 is not exclusive and can be selected according to actual needs, as long as one skilled in the art can realize it.
In one embodiment, the energy storage device further comprises a display interaction device, and the display interaction device is connected to the battery management device 200. The display interaction module can display various received information so that a user can know the running state of the energy storage device through the information displayed by the display interaction device, and the user can also send an operation instruction to control the work of the energy storage device through the display interaction device, so that the use is convenient and fast.
Specifically, the information displayed by the display interaction device is not unique and can be adjusted according to actual requirements, in this embodiment, the display interaction device can display the remaining capacity of the battery module 310, the temperature of the energy storage device, the voltage value of the cells in the battery module 310, the fault information of each period in the energy storage device, and/or the on/off state of each switch device, etc., so that a user can conveniently know and detect the operating state of each period in the energy storage device, and can take measures in time if abnormal occurs. The specific structure of the display interaction device is not unique, and may be, for example, a display screen which sets an area where the user looks to facilitate the user to view information. Furthermore, the display interaction device may be a touch screen type display screen, and the touch screen type intelligent display screen can not only display information, but also accept an operation instruction of the user, and then send the operation instruction to the battery management device 200, so as to realize control of other devices, and the use is convenient. It is understood that in other embodiments, the display interaction device may have other structures as long as the implementation is considered by those skilled in the art.
In one embodiment, the detection device 100 is further configured to detect a temperature value of the battery module 310 and send the temperature value to the battery management device 200. The battery management device 200 can control the energy storage device according to the temperature value of the battery module 310, specifically, when the temperature value of the battery module 310 is greater than a preset temperature threshold value, the current temperature of the battery module 310 is considered to be too high, and each switch device in the battery management device 200 can control the energy storage device to be turned off, so that the energy storage device stops running, the battery module 310 is prevented from being damaged or causing damage to other devices, and the effect of prolonging the service life of the energy storage device is achieved. It is understood that in other embodiments, the detection device 100 may have other structures as long as the skilled person realizes the above.
In one embodiment, the battery module 310 includes more than two unit batteries. The battery module 310 is an energy storage center, and its structure is not unique, and in this embodiment, the battery module 310 includes more than two single batteries, and the connection mode of each single battery is not limited, and a combination of serial connection and parallel connection may be adopted, as long as there is one positive output terminal and one negative output terminal to the outside, for example, a plurality of single batteries may be sequentially connected in series to form a battery pack. Further, detection device 100 can set up on the battery cell for detect each battery cell's relevant working parameter and environmental parameter, detection device 100 connects battery management device 200, the collection of specific connection battery management device 200 is followed the control board, battery management device 200 includes the main control board and gathers from the control board, it can be used for gathering the temperature of monomer voltage and module to gather from the control board, the main control board realizes the control to other devices according to data or other data that gather from the control board, make battery management device 200 can carry out subregion work, improve work accuracy and work efficiency.
In one embodiment, the single cell is a ternary lithium pouch cell. Specifically, 2P11S (about 40V for a single module total voltage) can be used to form a single module unit. The voltage collection line and the temperature collection line are welded at a battery tab in the battery module manufacturing process, the obtained voltage meets the condition that the difference value between the total voltage of the battery module 310 and the voltage of the access bus is at least 50-100V, when the number of the access serial modules is less than or equal to 8, 400V grade buses can be selected, and when the number of the battery modules 310 connected in series exceeds 8 and is less than or equal to 13, 600V/750V buses can be selected for access. The ternary lithium soft package battery has good cycle performance and high safety performance, and can improve the use reliability of the energy storage device.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. In one embodiment, referring to fig. 3, the energy storage device includes a battery module 310, a battery management system, a 24V power supply module, a bidirectional DC/DC converter, a display interaction module, a DC contactor, a shunt 360, a fuse 350, a breaker QF1, and a forced recovery module, the battery management device 200 corresponds to the battery management system, the power supply module 340 corresponds to the 24V power supply module, the main loop switch device 320 corresponds to the DC contactor, the bidirectional converter 330 corresponds to the bidirectional DC/DC converter, the display interaction device corresponds to the display interaction module, the forced recovery module corresponds to the forced recovery switch device 400, the forced recovery module can solve the problem that the battery management system starts the system protection logic function when the system power is too low, and can still recover the charging of the energy storage device, or the energy storage device is at the start of system deployment and debugging stage, possibly, at the stage of the full life cycle of the entire energy storage device or the stage of the over-discharge of the energy storage device due to abnormal communication, the voltage difference between the single battery module 310 and the entire battery module is too large, and the forced recovery module can enable the energy storage device to be charged and discharged completely, so that the effect of prolonging the service life is achieved.
In particular, the bi-directional DC/DC is integrated in the energy storage device, acting as a battery charger. The direct current bus side electric energy is converted through the DC/DC voltage to enable the bus side voltage to be higher than the total voltage of the battery side, so that the battery is charged, during discharging, an inductance element in the DC/DC converter is boosted, the electric energy of the battery is enabled to be higher than the bus side after being converted through the DC/DC voltage, and the electric energy is stored and supplied to a device side connected with the same bus.
The switching device in the form of a direct current contactor is adopted, and the on-off of a main loop of the contactor is controlled by a battery management system. The battery management system is a finished controller product and comprises a master control board and a slave control board, and the slave control board can be used for collecting the voltage of the single battery and the temperature of the module. The contactor on the main positive circuit is KM2 connected with the fuse 350 in series, the contactor on the main negative circuit is KM3 connected with the shunt 360 in series, the contactor on the main positive/main negative circuit is in a mode of being provided with an auxiliary contact, and the pre-charging circuit KM1 and the weak-current side direct current contactor KM4 are in a mode of not being provided with the auxiliary contact. The contactor is arranged in the system to protect the controller part when abnormality occurs on the battery side. And the on/off of the contactor comprises a single battery voltage value, a system temperature value, insulation voltage resistance and the like according to the detection and judgment of the BMS on the running state of the system.
The shunt 360 element is a copper sheet with standard resistance value, and when the current passes through, the two ends of the shunt are respectively connected with the voltage difference value of the sampling point to calculate the passing current value. The shunt 360 is a standard resistance block which is strictly calibrated, and the deviation value of the voltage at the front point and the rear point when the current passes through is measured and obtained through indirect calculation. The fuse 350 and the breaker QF1 are energy storage device protection elements, and the system generates overcurrent and overvoltage to protect the safety of the battery. The battery module 310 is an energy storage center, and is formed by connecting a plurality of single batteries in series and parallel. The welding of the collection voltage that contains when the battery is in groups and temperature line inserts BMS and gathers from the control board, and a plurality of battery module 310 rethread is in proper order the series connection form and is constituted the battery package.
The energy storage battery is preferably a ternary lithium pouch battery, preferably 2P11S (single module total voltage of about 40V) constituting a single module unit. The voltage collecting line and the temperature collecting line are welded at a battery tab in the battery module manufacturing process, and the obtained voltage meets the condition that the difference value between the total voltage of the battery module 310 and the voltage of the access bus is at least 50-100V. When the number of the connected serial modules is less than or equal to 8, 400V grade buses can be selected, and when the number of the battery modules 310 connected in series exceeds 8 and is less than or equal to 13, 600V/750V buses can be selected for access.
The forced recovery module is connected with a short-circuit-like line from a main loop of the battery system, can be a physical breaker QF1 switch in the middle, and can also be an electronic control device and can issue a communication control command to close the loop. The time when the system works is that the battery management system detects that the residual capacity of the residual capacity system is too low or the voltage of a single body is lower than a system verification warning threshold value, and the contactor reports a fault and is disconnected within a few seconds of starting; after the battery of the energy storage device circulates for two thousand times, the difference value of the voltage of the single battery is too large, and serious warning of too large system voltage difference occurs. The display interaction module can display the running state of the energy storage device, including residual capacity, temperature, monomer voltage, fault information and the on/off state of the switch type electrical element.
The energy storage device is accessed into the gateway system, and the energy information is exchanged between the energy storage device and a main control board of the battery management system. Firstly, the running state data of the energy storage device is sent to the upper gateway, and the state judgment is further carried out according to the following logic, and the corresponding instruction (charging/discharging/supplementing non-discharging) is further issued. The system is charged, the voltage value of the bus side of the energy storage device is adjusted to be slightly higher than that of the energy storage battery, and the current is charged from a high potential position to a low potential position; and discharging the system, and adjusting the voltage value of the output side maintained by the inductance of the energy storage device to be higher than the voltage of the bus side, so that the battery is discharged.
The charging/discharging method of the energy storage device comprises the following specific steps: when the battery is in a non-strong charging state and (the lowest voltage of the single battery cell is 3600mV or the system residual capacity is 35%), if the highest voltage of the single battery cell is less than 3850mV and is between 8 and 16 points, 4A is charged, if the system residual capacity is more than 40% and is between 16 and 18 points, 4A is discharged, if the system residual capacity is more than 40% and is between 18 and 21 points, 3A is discharged, and if the system residual capacity is between 21 and 7 points (the next day), the battery is not charged; in defining the protection value, the overshoot and over-discharge strategy of the system is prevented, when (the maximum voltage of the single cell is more than 4200mV and is charging) or (the minimum voltage of the single cell is less than 3600mV and is discharging), the system is not charged (the overcharge and the over-discharge are prevented), when (the residual capacity of the system is more than or equal to 99% and is charging) or (the residual capacity of the system is less than 40 and is discharging), and when (the minimum voltage of the single cell is less than 3580mV or the residual capacity of the system is less than 35%), and is not charging, 4A, charging (strong charging state).
Above-mentioned energy memory, detection device 100 detects the voltage value of battery module 310 and sends to battery management device 200, battery management device 200 controls the on-state of primary circuit switching device 320 according to the voltage value, when detecting that the voltage value is less than the system protection value, start protection function, control primary circuit switching device 320 disconnection, when needing energy memory rereading, accessible closed forces recovery switching device 400 to force the recovery to energy memory, make battery module 310 and bidirectional converter 330 switch on, the condition that energy memory can't be used when having avoided battery module 310's voltage to hang down, energy memory's use reliability has been improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. An energy storage device is characterized by comprising a battery module, a battery management device, a bidirectional converter, a main loop switch device, a detection device and a forced recovery switch device, wherein the bus side of the bidirectional converter is used for connecting a direct current bus and a power generation device, the battery side of the bidirectional converter is connected with the battery module through the main loop switch device, the battery side of the bidirectional converter is further connected with the battery module through the forced recovery switch device, the detection device and the main loop switch device are both connected with the battery management device, and the detection device is connected with the battery module.
2. The device according to claim 1, wherein the main circuit switch device comprises a main positive circuit switch device and a main negative circuit switch device, the main positive circuit switch device and the main negative circuit switch device are respectively arranged on a first branch and a second branch, and control terminals of the main positive circuit switch device and the main negative circuit switch device are both connected with the battery management device; the first branch is connected with the battery module and the bidirectional converter, and the second branch is connected with the battery module and the bidirectional converter; two contacts of a first contact pair of the forced recovery switching device are respectively connected with two ends of the main positive circuit switching device, which are positioned on the first branch, and two contacts of a second contact pair of the forced recovery switching device are respectively connected with two ends of the main negative circuit switching device, which are positioned on the second branch.
3. The apparatus of claim 2, further comprising a power module connecting the first leg and the second leg.
4. The apparatus of claim 3 further comprising a pre-charge switching device connected in parallel with said main positive loop switching device and a weak side switching device connected at one end to said first branch and at the other end to said power module.
5. The apparatus of claim 4 wherein said main positive circuit switching device, said main negative circuit switching device, said pre-charge switching device and said low side switching device are all DC contactors.
6. The apparatus of claim 2, further comprising a fuse connected in series with the first branch.
7. The apparatus of claim 6, further comprising a splitter connected in series with the second branch.
8. The apparatus of claim 7, further comprising a circuit breaker, wherein the first branch and the second branch are connected to the battery module through the circuit breaker.
9. The device of claim 1, further comprising a display interaction device, wherein the display interaction device is connected to the battery management device.
10. The device of claim 1, wherein the detection device is further configured to detect a temperature value of the battery module and send the temperature value to the battery management device.
11. The device of claim 1, wherein the battery module comprises more than two single batteries.
12. The device of claim 10, wherein the cell is a ternary lithium pouch cell.
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