CN115693816A - Energy storage device and fault starting method thereof - Google Patents
Energy storage device and fault starting method thereof Download PDFInfo
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- CN115693816A CN115693816A CN202110864426.1A CN202110864426A CN115693816A CN 115693816 A CN115693816 A CN 115693816A CN 202110864426 A CN202110864426 A CN 202110864426A CN 115693816 A CN115693816 A CN 115693816A
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Abstract
The invention provides an energy storage device and a fault starting method thereof, wherein the energy storage device comprises: a battery module; the high-voltage box comprises a relay electrically connected with the battery module and a battery management device in communication connection with the battery module, wherein the battery management device controls the relay to be closed or opened according to the operation parameters received from the battery module and is provided with a first communication interface; the energy storage converter module is electrically connected to the relay of the high-voltage box and can be electrically connected to a power grid, the energy storage converter module is provided with a second communication interface matched with the first communication interface, and the first communication interface and the second communication interface are connected through detachable signal lines; and the main control module is in communication connection with the battery management device and the energy storage converter module so as to receive the fault detection information of the battery management device and the energy storage converter module and control the energy storage equipment to operate based on the fault detection information of the battery management device and the energy storage converter module.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to energy storage equipment and a fault starting method of the energy storage equipment.
Background
The energy storage System mainly comprises a Battery, a BMS (Battery Management System), an HVB (High Voltage Box), a PCS (Power Conversion System) and a main control System, wherein the Battery is a carrier for storing energy, the BMS monitors the temperature, the Voltage and the like of a Battery cell, a corresponding control algorithm is adopted to ensure the safe and effective operation of the Battery System, and the PCS completes the Conversion of direct current/alternating current energy.
However, in practical applications, the voltage of the battery may be consumed during storage, transportation, etc., due to the characteristics of the battery, an under-voltage problem may occur in a specific battery cell, and the system may not work normally due to failures such as low battery voltage, excessive battery voltage difference, etc. reported by the BMS. Often can only change electric core or adopt electric core specialty battery charging outfit to charge among the correlation technique, so operation, extravagant material, extension debugging time still can increase project cost expenditure.
Disclosure of Invention
Therefore, the present invention is directed to provide an energy storage device and a fault starting method for the energy storage device, so as to solve the problem of how to timely and easily eliminate the under-voltage fault of the battery.
According to an aspect of the present invention, there is provided an energy storage device including: a battery module; a high-voltage box including a relay electrically connected to the battery module and a battery management device communicatively connected to the battery module, the battery management device controlling the relay to be turned on or off according to an operation parameter received from the battery module and having a first communication interface; the energy storage converter module is electrically connected to the relay of the high-voltage box and can be electrically connected to a power grid, the energy storage converter module is provided with a second communication interface matched with the first communication interface, and the first communication interface and the second communication interface are connected through detachable signal lines; the main control module is in communication connection with the energy storage converter module to receive the fault detection information of the battery management device and the energy storage converter module and control the energy storage equipment to operate based on the fault detection information of the battery management device and the energy storage converter module.
Optionally, the energy storage converter module is started in response to receiving fault detection information indicating no fault from the battery management device, and sends fault detection information indicating no fault to the main control module in response to that the dc side voltage of the energy storage converter module is greater than a set voltage, and the main control module controls the energy storage device to operate in response to receiving the fault detection information indicating no fault from the energy storage converter module.
Optionally, the battery management apparatus is in communication connection with the main control module to send the operating parameters received from the battery module to the main control module, and the main control module configures the charge and discharge parameters of the energy storage device according to the operating parameters.
Optionally, the battery module includes at least two cells, and the operating parameter of the battery module includes a voltage and/or a cell temperature of the at least two cells.
Optionally, the energy storage conversion module includes a DC-DC boost module and a DC-AC inversion module.
Optionally, the energy storage device further comprises: the battery module and the high-voltage box are arranged in the box body, and a first containing bin, a second containing bin and a third containing bin are arranged in the box body, are used for containing the battery module and the high-voltage box, are used for containing the energy storage converter module, and are used for containing the main control module.
Optionally, the first communication interface and the second communication interface are CAN interfaces or RS485 interfaces.
According to another aspect of the present invention, there is provided a fault starting method of the energy storage device, the fault starting method including: in response to the detection of an undervoltage fault by a battery management device of first energy storage equipment, short-circuiting a relay of the first energy storage equipment to communicate a battery module of the first energy storage equipment with an energy storage current transformation module; and connecting the second communication interface of the energy storage conversion module of the first energy storage device to the first communication interface of the battery management device of the second energy storage device without fault, so that the first energy storage device operates.
Optionally, the fault starting method further includes: and in response to the first energy storage device completing the set number of charge-discharge cycles or eliminating the under-voltage fault of the first energy storage device, connecting the second communication interface of the energy storage converter module of the first energy storage device to the first communication interface of the battery management device of the first energy storage device.
Optionally, the fault starting method further includes: and responding to the communication connection between the battery management device and the main control module, and controlling the main control module of the first energy storage device to shield the fault detection information sent by the battery management device of the first energy storage device when the battery management device of the first energy storage device detects an undervoltage fault.
According to the energy storage device and the fault starting method thereof provided by the embodiment of the invention, the battery management device and the energy storage converter module are configured into detachable communication connection, the energy storage converter module of the fault energy storage device can be connected to the battery management device of the fault-free energy storage device, and the relay of the fault energy storage device is in short circuit, so that the main control module of the fault energy storage device receives fault detection information indicating that the battery management device and the energy storage converter module are both fault-free, and the fault starting is further carried out smoothly. The energy storage equipment after starting can utilize the running mechanism of self to accomplish the charge-discharge to the electric core that the guarantee is undervoltage obtains charging. The above-mentioned structural design of energy storage equipment itself is just comparatively succinct, when taking place the undervoltage trouble, also only needs simply to change energy storage equipment's relation of connection just can start the operation smoothly, realizes the charging of undervoltage electric core, need not to change electric core, also need not to charge with the help of electric core specialty battery charging outfit separately, and easy and simple to handle, rapidly and practice thrift the material helps shortening on-the-spot debugging time to reducible material, equipment and personnel drop into, help controlling project cost.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a topology diagram of an energy storage device according to one embodiment of the invention;
FIG. 2 is a flow diagram of the startup of an energy storage device according to one embodiment of the invention;
FIG. 3 is a topology diagram of an energy storage device when applying a fail-over method according to an embodiment of the invention;
fig. 4 is a flow diagram of a fail-over method according to one embodiment of the invention.
The reference numbers illustrate:
1: an energy storage device; 1a: #1 energy storage device; 1b: #2 energy storage device;
10: a battery module;
20: a high pressure tank; 21: a relay; 21a: a # 1 relay; 22: a battery management device; 22a: #1 Battery management apparatus; 22b: #2 Battery management apparatus; 221: a first communication interface; 221a: #1 first communications interface; 221b: #2 first communication interface; 23: a fuse; 24: a direct current breaker;
30: an energy storage current transformation module; 30a: #1 energy storage and conversion module; 31: a second communication interface; 31a: #1 second communication interface; 32: a DC-AC inversion module; 33: DC bus;34: a direct current side relay; 35: an alternating current side relay; 36: an alternating current circuit breaker;
40: a main control module; 40a: #1 Master control Module.
Detailed Description
Embodiments in accordance with the present invention will now be described in detail with reference to the drawings, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
The embodiment of the invention provides an energy storage device and a fault starting method of the energy storage device, and aims to solve the problem of how to timely and simply eliminate the under-voltage fault of a battery.
Fig. 1 is a topology of an energy storage device 1 according to an embodiment of the invention.
Referring to fig. 1, an embodiment of an aspect of the present invention provides an energy storage device 1, where the energy storage device 1 includes a battery module 10, a high voltage box 20, an energy storage converter module 30, and a main control module 40.
The Battery module 10 may include a plurality of Battery packs, each Battery pack is composed of one or more Battery cells, and each Battery pack is configured with a BMU (Battery Management Unit), and the BMU may monitor operation parameters of each Battery cell, including voltage, battery cell temperature, and the like, so as to know whether each Battery cell operates normally, thereby ensuring safe and reliable operation of the energy storage device 1.
The high-voltage box 20 includes a relay 21 electrically connected between the battery module 10 and the energy storage converter module 30, and the connection or disconnection between the battery module 10 and the energy storage converter module 30 can be realized by closing or opening the relay 21, and when the relay 21 is closed, the battery module 10 can be connected to the dc side of the energy storage converter module 30, so that the dc side of the energy storage converter module 30 is electrified.
The high-voltage box 20 further includes a battery management device 22 communicatively connected to the BMUs of the battery module 10, and specifically, the battery management device 22 may adopt a CAN communication connection, that is, each BMU in the battery module 10 is connected via a CAN bus, and meanwhile, the battery management device 22 is added to the CAN bus connection, so that the battery management device 22 may obtain a monitoring result of each BMU, that is, obtain an operation parameter of each battery cell. The battery management device 22 may analyze and detect the operation parameters, and then control the relay 21 to be turned on or off according to the detection result, for example, may detect whether the voltage of each battery cell is sufficient, and if it is determined that the voltage of each battery cell is sufficient, the relay 21 may be controlled to be turned on, so that the dc side of the energy storage converter module 30 is electrified, and if it is determined that the voltage of each battery cell is too low, an under-voltage fault may be reported, and the relay 21 is controlled to be turned off.
The high-voltage box further comprises a fuse 23 and a direct-current circuit breaker 24 which are arranged on the main loop together with the relay 21, the main loop can be automatically cut off when faults such as overload, short circuit, undervoltage and the like occur, the protection effect is achieved, and the safe operation of the energy storage device 1 is guaranteed. Specifically, the fuse 23 is connected to the positive connection line of the main circuit and is connected to the side of the relay 21 facing the battery module 10, and the dc breaker 24 is connected to the side of the relay 21 facing the energy storage converter module 30. It is understood that the under-voltage fault here refers to a primary circuit under-voltage, and the under-voltage fault detected by the battery management device 22 is an individual cell under-voltage.
The energy storage converter module 30 can control the charging and discharging processes of the battery module 10 to perform ac/dc conversion. The dc side of the energy storage converter module 30 is electrically connected to the relay 21 of the high voltage tank 20 and the ac side of the energy storage converter module 30 may be electrically connected to the grid, thereby connecting the battery module 10 to the grid. The energy storage converter module 30 may also be communicatively coupled to the battery management device 22 to receive fault detection information from the battery management device 22. Specifically, the battery management device 22 has a first communication interface 221, and the energy storage converter module 30 has a second communication interface 31 matching the first communication interface 221, and the communication connection can be realized through a signal line connecting the first communication interface 221 and the second communication interface 31. The first communication interface 221 and the second communication interface 31 may adopt a CAN interface or an RS485 interface, as long as the two are matched.
The main control module 40 is communicatively connected to the energy storage converter module 30, for example, as shown in fig. 1, an RS485 interface may be used to implement the communicative connection between the main control module and the energy storage converter module 30, and a Modbus _ RTU protocol is used to receive the fault detection information of the battery management device 22 and the energy storage converter module 30, and to control the operation of the energy storage device 1 based on the fault detection information of the battery management device 22 and the energy storage converter module 30. When there is no fault in both the battery management device 22 and the energy storage converter module 30, the main control module 40 can determine that the current energy storage device 1 is suitable for starting and can enter into operation, thereby ensuring safe operation of the energy storage device 1. Specifically, the battery management device 22 may send the fault detection information to the energy storage converter module 30, and then the fault detection information is transmitted to the main control module by the energy storage converter module 30.
Fig. 2 is a start-up flow diagram of the energy storage device 1 according to an embodiment of the invention.
Referring to fig. 2, before starting the energy storage device 1, a check before power-on is performed, and after the check is determined to be correct, the control power is turned on, the control button of the high-voltage box 20 is turned on, and the dc breaker 24 is turned on. Then, the battery management device 22 performs self-checking, and if a fault is detected, for example, the battery cell undervoltage fault, the BMS fault is displayed on the interface for the staff to check and remove the corresponding fault. If the battery management device 22 detects no fault, the relay 21 may be controlled to close, and at the same time, the dc breaker 24 may be closed, so as to electrify the dc side of the energy storage converter module 30 (the dc side relay 34 of the energy storage converter module 30 may maintain a closed state). The energy storage converter module 30 may be activated in response to receiving the fault detection information indicating no fault from the battery management device 22, and specifically, the ac switch of the energy storage converter module 30 is closed (the ac side relay 35 may be kept in a closed state, and the action at this time is only to close the ac circuit breaker 36, or to close the ac side relay 35 and the ac circuit breaker 36 at the same time). After starting, the energy storage converter module 30 performs self-checking, including determining whether the dc side voltage is greater than a set voltage, where the set voltage is specifically the minimum power supply voltage required for operating the energy storage device 1. If the voltage of the dc side of the energy storage and conversion module 30 is greater than the set voltage, the startup condition is satisfied, and fault detection information indicating no fault is sent to the main control module 40, otherwise, no fault detection information is sent. The main control module 40 controls the energy storage device 1 to operate in response to receiving fault detection information indicating no fault from the energy storage converter module 30, and specifically, the main control module 40 may also perform self-checking before controlling the energy storage device 1 to operate, then receive a power instruction, and configure the charging and discharging parameters of the energy storage device 1 according to the power instruction, so as to implement corresponding operation.
For the fault detection information indicating no fault, which is sent to the main control module 40 by the energy storage converter module 30, the fault detection information of the battery management device 22 and the energy storage converter module 30 may be collected and sent to the main control module 40 together, or the fault detection information of the energy storage converter module 30 may be only sent, because for a single energy storage device 1, the energy storage converter module 30 can be started only under the condition that the battery management device 22 has no fault, so the energy storage converter module 30 can be started and send information to the main control module 40, which means that the battery management device 22 does not detect a fault, and at this time, the sending of the fault detection information of the energy storage converter module 30 only can reduce the amount of data sent, which is beneficial to reducing communication pressure and saving overhead.
It can be understood that, when the battery management apparatus 22 detects an undervoltage fault of an individual cell, in the case that the battery module 10 includes a plurality of cells, although the voltage of the individual cell is insufficient, the sum of the voltages of the entire battery module 10 is often greater than the set voltage, so that the energy storage device 1 can still operate if the relay 21 is closed. Based on this, the battery management device 22 and the energy storage converter module 30 may be configured to be detachably connected in communication, that is, the first communication interface 221 of the battery management device 22 and the second communication interface 31 of the energy storage converter module 30 are connected through a detachable signal line, and the energy storage apparatus 1 may be activated by changing the connection mode. This is described next in connection with fig. 3.
Fig. 3 is a topology diagram of an energy storage device when a fault start method is applied according to an embodiment of the present invention.
Referring to fig. 3, when the #1 battery management device 22a of the #1 energy storage apparatus 1a detects an undervoltage fault, the communication connection between the #1 first communication interface 221a and the #1 second communication interface 31a may be released, so as to avoid sending the fault detection information indicating the undervoltage fault of the #1 battery management device 22a to the #1 energy storage converter module 30a. Accordingly, the #2 first communication interface 221b of the #2 battery management device 22b of the #2 energy storage equipment 1b without a fault may be connected to the #1 second communication interface 31a, so that the #1 energy storage converter module 30a receives the fault detection information sent by the #2 battery management device 22b and indicating no fault, and the #1 energy storage converter module 30a may be started normally. In addition, since the #1 battery management device 22a controls the #1 relay 21a to be turned off (i.e., to be kept in an unclosed state during startup) when detecting an undervoltage fault, the #1 relay 21a can be disabled by short-circuiting the #1 relay 21a, which is equivalent to a closed state, so that the #1 energy storage converter module 30a detects that the dc side is charged and the voltage is greater than the set voltage, and can send fault detection information indicating no fault to the #1 main control module 40a, and the #1 main control module 40a can control the #1 energy storage device 1a to operate according to the fault detection information, thereby completing the smooth startup of the #1 energy storage device 1 a. The started #1 energy storage device 1a can complete charging and discharging by using a self running mechanism, so that the under-voltage battery cell is charged. The above-mentioned structural design of energy storage equipment 1 itself is just comparatively succinct, when taking place the undervoltage trouble, also only needs simply to change energy storage equipment 1's relation of connection just can start the operation smoothly, realizes the charging of undervoltage electric core, need not to change electric core, also need not to charge with the help of electric core specialty battery charging outfit separately, easy and simple to handle, rapidly and practice thrift the material, help shortening on-the-spot debugging time to reducible material, equipment and personnel input help controlling project cost.
Alternatively, the battery management apparatus 22 is in communication connection with the main control module 40, for example, as shown in fig. 1, an RS485 interface may be used to implement the communication connection between the battery management apparatus and the main control module 40, and a Modbus _ RTU protocol is used to send the operation parameters received from the battery module 10 to the main control module 40, and the main control module 40 configures the charging and discharging parameters of the energy storage device 1 according to the operation parameters. As described above, the battery management device 22 can send the fault detection information obtained by analyzing the operation parameters of the battery module 10 to the main control module 40 through the energy storage converter module 30. The monitored operation parameters are additionally sent to the main control module 40, so that the main control module 40 can conveniently follow the condition of the battery module 10 in real time, and the safety of the charging and discharging process is ensured. In addition, the data volume of the operation parameters of the battery module 10 is large and needs to be transmitted in real time, and the communication connection is directly established between the battery management device 22 and the main control module 40 to transmit the operation parameters, without using the energy storage converter module 30 as a relay, so that the data transmission speed can be increased, the timeliness of the data can be ensured, the operation efficiency of the energy storage device 1 can be improved, and the communication pressure between the energy storage converter module 30 and the main control module 40 can be reduced. It is understood that the battery management device 22 may or may not transmit the failure detection information to the main control module 40. For the sending situation, when the battery management device is started in a fault, the main control module 40 needs to be controlled to shield fault detection information sent by the corresponding battery management device 22, so as to avoid information contradiction, ensure that the energy storage device 1 with the undervoltage fault is normally started, and realize charging of the undervoltage battery cell. The reason why the communication connection between the battery management device 22 and the main control module 40 is not directly cut off is that the main control module 40 can also obtain the corresponding operation parameters of the battery module 10 from the battery management device 22, so that the state of the battery module 10 is monitored in the charging and discharging process, the safety of the charging and discharging process is ensured, whether the under-voltage battery cell is charged to eliminate the fault can be known, and whether the fault-reporting energy storage device 1 is enabled to recover to operate independently can be conveniently judged.
Optionally, the energy storage and conversion module 30 comprises a DC-DC boost module and a DC-AC inversion module 32. By configuring the energy storage and conversion module 30 into a two-stage structure, the DC-DC boost module is used to boost the voltage, and then the DC-AC inverter module 32 is used to complete the AC-DC conversion, so that the available voltage range of the DC side of the energy storage and conversion module 30 can be widened, and the set voltage can be reduced. On the one hand, the bearing capacity of the energy storage device 1 to individual cell under-voltage faults can be improved, and the fault starting success rate is improved. On the other hand, the number of battery cells of the battery module 10 can be reduced, so that the configuration of the number of battery cells of the battery module 10 is more flexible, and the battery module is beneficial to adapting to different application scenarios and expanding the application range of the energy storage device 1. Specifically, as shown in fig. 1, the energy storage converter module 30 includes a DC-bus 33, in which a DC-DC boost module is provided.
Optionally, as shown in fig. 1, the main control module 40 may further be in communication connection with a cloud via WIFI, so as to send a message to the cloud or receive a cloud message, thereby implementing interaction between the energy storage device 1 and other devices.
Optionally, the energy storage device 1 further includes a box body, and a first accommodating bin for accommodating the battery module 10 and the high-voltage box 20, a second accommodating bin for accommodating the energy storage converter module 30, and a third accommodating bin for accommodating the main control module 40 are disposed in the box body. By integrating the battery module 10, the high-voltage box 20, the energy storage converter module 30 and the main control module 40 into the same box, a modularized energy storage all-in-one machine can be formed, so that the energy storage device 1 can be conveniently moved and transported as a whole, and the shape of the energy storage device 1 is simple. By arranging the first accommodating bin, the second accommodating bin and the third accommodating bin in the box body, on one hand, enough space can be reserved for all heating components, the risk that the working performance is influenced by the mutual heat transfer of the heating components is reduced, meanwhile, the heat is convenient to take away by air flow circulation, the heat dissipation effect is improved, and the stable operation of the energy storage device 1 is ensured; on the other hand, the relative position between each component can be fixed, so that the components can be stably connected even in the moving and transporting processes, and the work of checking whether the connection is disconnected or not in the subsequent use process is reduced. It is understood that the third accommodating chamber may be a specially configured accommodating chamber, or may be a space naturally formed in the box body and outside the first accommodating chamber and the second accommodating chamber, and the present invention is not limited herein.
An embodiment of another aspect of the present invention provides a fault starting method for the energy storage device.
Fig. 4 is a flow diagram of a fail-over method according to one embodiment of the invention.
Referring to fig. 4, in step 401, in response to the battery management apparatus of the first energy storage device (refer to #1 energy storage device 1a shown in fig. 3) detecting an undervoltage fault, the relay of the first energy storage device is shorted, so that the battery module and the energy storage converter module of the first energy storage device are communicated. When the battery management device of the first energy storage device detects the undervoltage fault, the relay of the first energy storage device is controlled to be switched off. The relay is disabled by short-circuiting the relay, namely, the relay is changed into a closed state, so that the energy storage converter module of the first energy storage device detects that the direct current side is electrified, and for the condition that the battery module comprises a plurality of battery cells and only individual battery cells have an undervoltage fault, the direct current side voltage detected by the energy storage converter module is always larger than a set voltage, and therefore the main control module of the first energy storage device determines that the energy storage converter module has no fault and meets the startup condition.
In step 402, the second communication interface of the energy storage converter module of the first energy storage device is connected to the first communication interface of the battery management apparatus of the second energy storage device without a fault, so that the first energy storage device operates. By changing the connection mode, the energy storage converter module of the first energy storage device can receive fault detection information which indicates no fault and is sent by the battery management device of the second energy storage device without fault, so that the main control module of the first energy storage device determines that the battery management device is fault-free, and the startup condition is met. The main control module can control the first energy storage device to start and operate smoothly by combining fault detection information indicating no fault in two aspects, the charging of the under-voltage battery core is realized, the battery core does not need to be replaced, and the charging is carried out by means of professional battery core charging equipment, so that the operation is simple, convenient and rapid, the material is saved, the field debugging time is shortened, the investment of materials, equipment and personnel can be reduced, and the project cost is controlled.
Optionally, the fault starting method further includes: and connecting a second communication interface of the energy storage current transformation module of the first energy storage equipment to a first communication interface of a battery management device of the first energy storage equipment in response to the first energy storage equipment completing the set times of charge-discharge cycles or the under-voltage fault elimination of the first energy storage equipment. After the fault is eliminated, namely, the under-voltage battery core is charged, the connection between the first energy storage device and the second energy storage device can be detached by restoring the signal line connection of the first energy storage device, so that the first energy storage device and the second energy storage device operate independently, the normal work of the first energy storage device and the second energy storage device is guaranteed, and the waste caused by long-time occupation of the second energy storage device is reduced. Specifically, how to determine the elimination of the fault may be to configure a set number of times, and after the first energy storage device completes the set number of charge and discharge cycles, it is considered that the under-voltage battery cell has completed charging, which is helpful for simplifying the scheme; and the voltage of each cell of the first energy storage device can be continuously monitored, whether the undervoltage fault is eliminated or not is definitely detected, and the connection duration of the first energy storage device and the second energy storage device is favorably shortened, so that the first energy storage device and the second energy storage device can recover to operate independently as soon as possible. It can be understood that after it is determined that the under-voltage fault is eliminated, the short circuit of the relay of the first energy storage device may be eliminated or may be maintained continuously, and whether the short circuit is eliminated or not is determined according to the need in the subsequent use, which is not limited herein.
Optionally, the fault starting method further includes: and responding to the communication connection between the battery management device and the main control module and the detection of the undervoltage fault by the battery management device of the first energy storage equipment, and controlling the main control module of the first energy storage equipment to shield fault detection information sent by the battery management device of the first energy storage equipment. When the battery management device is in communication connection with the main control module, the battery management device can send the operation parameters received from the battery module to the main control module, so that the main control module configures the charging and discharging parameters of the energy storage device according to the operation parameters, and the safety of the charging and discharging process is ensured. At the same time, however, the battery management device may also send fault detection information to the master control module. The main control module is controlled to shield fault detection information directly sent by the battery management device after detecting the undervoltage fault, so that the contradiction between the fault detection information sent to the energy storage converter module of the first energy storage device by the battery management device of the second energy storage device without the fault can be avoided, the normal starting of the first energy storage device with the undervoltage fault is ensured, and the charging of the undervoltage battery core is realized. Therefore, the communication connection between the battery management device and the main control module is not directly cut off, because the main control module can also obtain the operation parameters of the battery module of the first energy storage device from the battery management device, the state of the battery module is monitored in the charging and discharging process, the safety of the charging and discharging process is ensured, whether the undervoltage battery cell finishes charging or not can be known, the fault is eliminated, and whether the first energy storage device reporting the fault is enabled to recover to operate independently or not is conveniently judged.
According to the energy storage device 1 and the fault starting method thereof in the embodiment of the invention, the battery management device 22 and the energy storage converter module 30 are configured to be detachably connected in a communication manner, the energy storage converter module 30 of the energy storage device 1 with the fault can be connected to the battery management device 22 of the energy storage device 1 without the fault, and the relay 21 of the energy storage device 1 with the fault is short-circuited, so that the main control module 40 of the energy storage device 1 with the fault receives fault detection information indicating that neither the battery management device 22 nor the energy storage converter module 30 has the fault, and the energy storage device 1 with the fault can be started smoothly. The energy storage device 1 after being started can utilize the self running mechanism to complete charging and discharging, so that the under-voltage battery core is ensured to be charged. The above-mentioned structural design of energy storage equipment 1 itself is just comparatively succinct, when taking place the undervoltage trouble, also only needs simply to change energy storage equipment 1's relation of connection just can start the operation smoothly, realizes the charging of undervoltage electric core, need not to change electric core, also need not to charge with the help of electric core specialty battery charging outfit separately, easy and simple to handle, rapidly and practice thrift the material, help shortening on-the-spot debugging time to reducible material, equipment and personnel input help controlling project cost.
Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. It will be understood that those skilled in the art will recognize that these modifications and variations can still fall within the spirit and scope of the embodiments of the invention as defined by the claims.
Claims (10)
1. An energy storage device (1), characterized in that it comprises:
a battery module (10);
a high-voltage box (20) comprising a relay (21) electrically connected to the battery module (10) and a battery management device (22) communicatively connected to the battery module (10), the battery management device (22) controlling the relay (21) to close or open according to operating parameters received from the battery module (10) and having a first communication interface (221);
an energy storage converter module (30) electrically connected to the relay (21) of the high-voltage box (20) and electrically connectable to the grid, the energy storage converter module (30) having a second communication interface (31) matching the first communication interface (221), and the first communication interface (221) and the second communication interface (31) being connected by a detachable signal line;
the main control module (40) is in communication connection with the energy storage converter module (30) to receive the fault detection information of the battery management device (22) and the energy storage converter module (30), and controls the energy storage equipment (1) to operate based on the fault detection information of the battery management device (22) and the energy storage converter module (30).
2. Energy storage device (1) according to claim 1,
the energy storage converter module (30) is started in response to receiving fault detection information indicating no fault from the battery management device (22), and in response to the fact that the direct-current side voltage of the energy storage converter module (30) is larger than a set voltage, fault detection information indicating no fault is sent to the main control module (40), and the main control module (40) controls the energy storage equipment (1) to operate in response to receiving the fault detection information indicating no fault from the energy storage converter module (30).
3. Energy storage device (1) according to claim 1,
the battery management device (22) is in communication connection with the main control module (40) so as to send the operation parameters received from the battery module (10) to the main control module (40), and the main control module (40) configures the charging and discharging parameters of the energy storage device (1) according to the operation parameters.
4. Energy storage device (1) according to claim 1,
the battery module (10) comprises at least two cells, and the operating parameters of the battery module (10) comprise the voltages and/or the cell temperatures of the at least two cells.
5. Energy storage device (1) according to any of claims 1 to 4,
the energy storage conversion module (30) comprises a DC-DC boosting module and a DC-AC inversion module (32).
6. Energy storage device (1) according to any of claims 1 to 4, characterized in that the energy storage device (1) further comprises:
the battery energy storage converter comprises a box body, wherein a first containing bin for containing the battery module (10) and the high-voltage box (20), a second containing bin for containing the energy storage converter module (30) and a third containing bin for containing the main control module (40) are arranged in the box body.
7. Energy storage device (1) according to any of claims 1 to 4,
the first communication interface (221) and the second communication interface (31) are CAN interfaces or RS485 interfaces.
8. A fault start-up method of an energy storage device according to any one of claims 1 to 7, characterized in that the fault start-up method comprises:
in response to the detection of an undervoltage fault by a battery management device of first energy storage equipment, short-circuiting a relay of the first energy storage equipment to communicate a battery module and an energy storage converter module of the first energy storage equipment;
and connecting the second communication interface of the energy storage current conversion module of the first energy storage device to the first communication interface of the battery management device of the second energy storage device without fault, so that the first energy storage device operates.
9. The method of starting according to claim 8, wherein the method of fault starting further comprises:
and in response to the first energy storage device completing the set number of charge-discharge cycles or eliminating the under-voltage fault of the first energy storage device, connecting the second communication interface of the energy storage converter module of the first energy storage device to the first communication interface of the battery management device of the first energy storage device.
10. A method of starting according to claim 8 or 9, wherein the method of fault starting further comprises:
and responding to the communication connection between the battery management device and the main control module, and controlling the main control module of the first energy storage device to shield the fault detection information sent by the battery management device of the first energy storage device when the battery management device of the first energy storage device detects an undervoltage fault.
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| CN202110864426.1A CN115693816A (en) | 2021-07-29 | 2021-07-29 | Energy storage device and fault starting method thereof |
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