A monitoring device and method for lead-acid batteries in substations

Abstract

The present invention discloses a lead-acid battery monitoring device and method for a substation. The device comprises: a host computer connected to a data transmission module; a current transformer connected to a battery pack, the current transformer being used to detect the current of the battery pack; a data transmission module connected to the current transformer, the data transmission module also being connected to a parameter sensor, for transmitting data detected by the current transformer to the host computer; each parameter sensor being connected to a corresponding battery pack, with multiple parameter sensors being connected in series, the parameter sensors being used to detect the parameters of the corresponding battery pack cells; each battery pack comprising multiple battery cells and a transfer switch, with multiple battery packs being connected in series; and a transfer switch being used to switch the number of battery cells in the battery pack connected to the corresponding parameter sensor. The technical solution of the embodiments of the present invention can save the number of parameter sensors, save costs, reduce the number of wiring connections, speed up device deployment, and reduce workload.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply for transformer substations, and in particular to a monitoring device and a monitoring method for lead-acid batteries in transformer substations. Background Art

[0002] A substation's DC power supply system consists of two components: an AC rectifier and a battery, connected in parallel. Under normal conditions, the AC rectifier supplies power to the DC load, while the battery is in a floating charge standby state. In the event of a power outage, the battery takes over the energy supply. Substations typically utilize lead-acid batteries, which are present in significant numbers. When used as a backup power source, batteries are typically charged using a float charge voltage to compensate for self-discharge losses and quickly restore them to a near-fully charged state after discharge. Therefore, a float voltage monitoring device is typically installed to monitor the battery's status and set an appropriate float voltage. Accurately understanding the status of individual batteries is crucial for timely replacement when they fall below their rated power, so each battery is typically equipped with a parameter sensor.

[0003] When monitoring the float charge voltage of batteries in substations, a separate sensor is usually used for each battery because the status of each battery needs to be monitored. However, since the number of batteries in a substation is very large, even up to one or two hundred, not only a large number of sensors are required, which is costly, but also a large number of wiring connections are required, which is complicated. Summary of the Invention

[0004] The present invention provides a lead-acid battery monitoring device and monitoring method for a transformer substation, which can save the number of parameter sensors, save costs, reduce the number of wiring, speed up the device deployment, and reduce work intensity.

[0005] According to one aspect of the present invention, a substation lead-acid battery monitoring device is provided, which is characterized by comprising: a host computer, a data transmission module, a current transformer, a plurality of battery packs, and a plurality of parameter sensors;

[0006] The host computer is connected to the data transmission module;

[0007] The current transformer is connected to the battery pack and is used to detect the current of the battery pack;

[0008] The data transmission module is connected to the current transformer and is also connected to the parameter sensor, and is used to transmit the received data detected by the current transformer to the host computer;

[0009] Each parameter sensor is connected to a corresponding battery pack, and multiple parameter sensors are connected in series. The parameter sensors are used to detect the parameters of the corresponding battery pack cells;

[0010] Each battery pack includes multiple battery bodies and a conversion switch, and the multiple battery packs are connected in series; the conversion switch is used to switch the number of battery bodies in the battery pack connected to the corresponding parameter sensor.

[0011] Optionally, the conversion switch is connected in series with the negative poles of the plurality of battery bodies in the corresponding battery pack; the conversion switch is also connected with a parameter sensor corresponding to the battery pack.

[0012] Optionally, the transfer switch is also connected to the previous transfer switch, the negative pole of the battery body connected to the end in the previous battery pack, the positive pole of the battery body connected to the head end in the battery pack where it is located, and the next transfer switch.

[0013] Optionally, the parameter sensor is also connected to the positive electrode of the battery body connected to the head end in the corresponding battery pack.

[0014] Optionally, the data transmission module includes a voltage and current monitoring device and a communication converter;

[0015] The voltage and current monitoring device is connected to the current transformer, and is used to monitor the overall current parameters of the multiple battery packs according to the current transmitted by the current transformer;

[0016] The communication converter is connected to the parameter sensor and is used for signal conversion, converting the signal transmitted by the parameter sensor into a signal that can be recognized by the battery concentrator and the upper function.

[0017] Optionally, the data transmission module further includes a battery concentrator, which is connected to the voltage and current monitoring device and the communication converter, and is used to transmit data received from the voltage and current monitoring device and the communication converter to the host computer.

[0018] According to another aspect of the present invention, a monitoring method for a lead-acid battery monitoring device in a substation is provided, characterized in that it is performed by the lead-acid battery monitoring device in a substation according to the first aspect of the present invention; the monitoring method comprises:

[0019] The host computer receives the parameter information of the battery pack through the data transmission module;

[0020] The host computer determines the battery pack with an abnormality based on the parameter information of the battery pack, and controls the corresponding switch to switch the circuit, disconnecting the abnormal battery pack from the circuits of the other battery packs;

[0021] The host computer switches the lines of the connected battery bodies in sequence by controlling the switching switches in the abnormal battery pack, and receives the parameters of the battery pack cells detected by the parameter sensors;

[0022] The host computer determines the abnormal battery body according to the parameters of the battery pack monomer.

[0023] Optionally, the host computer receives the parameter information of the battery pack through the data transmission module, including:

[0024] The host computer receives the overall current parameters of the battery pack detected by the current transformer through the voltage and current monitoring device;

[0025] The host computer receives the parameters of the corresponding battery pack cells detected by the parameter sensors.

[0026] Optionally, the host computer receives the overall current parameters of the battery pack detected by the current transformer through the voltage and current monitoring device, including:

[0027] The host computer controls the voltage and current monitoring device to calculate the primary side large current based on the secondary side small current output by the current transformer, thereby obtaining the overall current parameters of multiple battery packs.

[0028] Optionally, the host computer controls the switching switch in the abnormal battery pack to sequentially switch the lines of the connected battery bodies, and receives the parameters of the battery pack cells detected by the parameter sensor, including:

[0029] The host computer first disconnects the circuit of any battery body by controlling the switch in the abnormal battery pack, and receives the parameters of the battery pack monomer detected by the parameter sensor at this time;

[0030] If the parameters of the battery pack are abnormal, the switching switch is controlled to disconnect the line of another battery body and receive the parameters of the battery pack detected by the parameter sensor at this time. This step is repeated until the parameters of all battery pack cells are obtained.

[0031] The technical solution of the embodiment of the present invention is to group a huge number of battery bodies, connect multiple battery bodies in series, set a conversion switch to form a battery pack, and reasonably connect multiple battery packs with parameter sensors, so as to save the number of parameter sensors and save costs; by switching the conversion switch and reasonably setting the lines, the number of connection lines can be reduced. For example, when the number of battery bodies in the battery pack is 5, the number of cables required is 20, but because the conversion switch is set to regularize the lines, only 19 cables are needed, saving 1 connecting cable as a whole. The more battery groups in the battery pack, the more cables can be saved. The number of battery bodies in the substation is as high as one or two hundred, so a large number of cables can be saved as a whole, the speed of device layout is accelerated, and the intensity of work is reduced.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic structural diagram of a lead-acid battery monitoring device for a substation provided by an embodiment of the present invention;

[0035] Figure 2 This is a structural diagram of a battery pack and a parameter sensor provided by an embodiment of the present invention;

[0036] Figure 3 This is a structural diagram of another substation lead-acid battery monitoring device provided by an embodiment of the present invention;

[0037] Figure 4 This is a flow chart of a monitoring method for a lead-acid battery monitoring device in a substation provided by an embodiment of the present invention;

[0038] Figure 5 This is a flow chart of another monitoring method for a lead-acid battery monitoring device in a substation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] An embodiment of the present invention provides a substation lead-acid battery monitoring device, which is suitable for monitoring substation lead-acid batteries. The substation lead-acid battery monitoring device can be implemented in the form of hardware and / or software. Figure 1 This is a schematic diagram of the structure of a lead-acid battery monitoring device for a substation provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a battery pack and parameter sensor provided by an embodiment of the present invention, see Figure 1 and Figure 2 , the device comprises:

[0042] A host computer 1, a data transmission module 2, a current transformer 3, multiple battery packs 4, and multiple parameter sensors 5; the host computer 1 is connected to the data transmission module 2; the current transformer 3 is connected to the battery pack 4, and the current transformer 3 is used to detect the current of the battery pack 4; the data transmission module 2 is connected to the current transformer 3, and the data transmission module 2 is also connected to the parameter sensor 5, and is used to transmit the received data detected by the current transformer 3 to the host computer 1; each parameter sensor 5 is connected to the corresponding battery pack 4, and the multiple parameter sensors 5 are connected in series, and the parameter sensors 5 are used to detect the parameters of the corresponding battery pack 4 cells; each battery pack 4 includes multiple battery bodies 41 and a conversion switch 42, and the multiple battery packs 4 are connected in series; the conversion switch 42 is used to switch the number of battery bodies 41 in the battery pack 4 connected to the corresponding parameter sensor 5.

[0043] Specifically, the host computer 1 can be a central control computer, configured to receive data from the battery packs 4 uploaded by the data transmission module 2 and to determine which battery packs 4 and battery cells 41 have experienced an abnormality based on the data. The data transmission module 2 is configured to receive the current of the battery packs 4 measured by the current transformer 3 and the parameters of the battery cells 4 measured by the parameter sensor 5, and upload them to the host computer 1. The current transformer 3 is connected to a battery pack 4 and is used to detect the current of the battery pack 4. Exemplarily, the current transformer 3 senses the high primary current of multiple battery packs 4 and generates a corresponding low secondary current, which is transmitted to the data transmission module 2 for detection. Each battery pack 4 includes multiple battery cells 41 and a transfer switch 42. Exemplarily, each battery pack 4 may include five battery cells 41 and one transfer switch 42. The transfer switch 42 is connected in series with the negative terminals of the multiple battery cells 41 in the corresponding battery pack 4. The transfer switch 42 is also connected to the corresponding parameter sensor 5 of the battery pack 4. The transfer switch 42 is further connected to the preceding transfer switch 42, the negative electrode of the battery body 41 connected to the end of the preceding battery pack 4, the positive electrode of the battery body 41 connected to the head end of the battery pack 4 in which the transfer switch 42 resides, and the following transfer switch 42. The parameter sensor 5 is further connected to the positive electrode of the battery body 41 connected to the head end of the corresponding battery pack 4. The parameter sensor 5 is used to detect parameters of the cells of the corresponding battery pack 4; the parameters of the cells of the corresponding battery pack 4 may include the voltage of the cells of the battery pack 4 and the internal resistance of the cells of the battery pack 4.

[0044] Specifically, the current transformer 3 senses the primary-side large current of the multiple battery packs 4, that is, the overall current parameters of the multiple battery packs 4. Since the current value of the primary-side large current is large and will burn out the detection equipment, it is necessary to use the current transformer 3 to generate a corresponding secondary-side small current based on the primary-side large current and transmit it to the data transmission module 2 for detection; wherein, the secondary-side small current is proportional to the primary-side large current, and the parameters of the primary-side large current can be calculated based on the secondary-side small current. Each parameter sensor 5 detects the parameters of the corresponding battery pack 4 cell and transmits it to the data transmission module 2. The data transmission module 2 receives the secondary-side small current transmitted by the current transformer 3, calculates the parameters of the primary-side large current, and uploads them to the host computer 1. The data transmission module 2 receives the parameters of the battery pack 4 cells transmitted by the parameter sensor 5, converts them into signals that can be recognized by the host computer 1, and transmits them to the host computer 1. The host computer 1 identifies the abnormal battery pack 4 based on the overall current parameters of the multiple battery packs 4 and the parameters of each individual battery pack 4. By controlling the transfer switch 42 to switch the circuit, the abnormal battery pack 4 can be isolated from the remaining battery packs 4. The host computer 1 sequentially changes the number of connected battery cells 41 by controlling the transfer switch 42 in the abnormal battery pack 4, and continues to receive data from the parameter sensor 5 corresponding to the abnormal battery pack 4. The host computer 1 confirms the abnormal battery pack 41 based on the data transmitted by the parameter sensor 5 after each switching of the transfer switch 42.

[0045] The technical solution of this embodiment is to group a huge number of battery bodies, connect multiple battery bodies in series, set conversion switches to form a battery pack, and reasonably connect multiple battery packs with parameter sensors, so as to save the number of parameter sensors and save costs; by switching the conversion switches and reasonably setting the lines, the number of connection lines can be reduced. For example, when the number of battery bodies in the battery pack is 5, the number of cables required is 20, but since the conversion switches are set to regularize the lines, only 19 cables are needed, saving 1 connection cable as a whole. The more battery groups in the battery pack, the more cables can be saved. The number of battery bodies in the substation is as high as one or two hundred, so a large number of cables can be saved as a whole, the speed of device layout is accelerated, and the intensity of work is reduced.

[0046] Figure 3 This is a schematic diagram of the structure of another lead-acid battery monitoring device for a substation provided by an embodiment of the present invention. Figure 3Optionally, the data transmission module 2 includes a voltage and current monitoring device 21 and a communication converter 22; the voltage and current monitoring device 21 is connected to the current transformer 3, and the voltage and current monitoring device 21 is used to monitor the overall current parameters of multiple battery packs 4 according to the current transmitted by the current transformer 3; the communication converter 22 is connected to the parameter sensor 5, and the communication converter 22 is used to perform signal conversion, converting the signal transmitted by the parameter sensor 5 into a signal that can be recognized by the battery concentrator 23 and the host computer 1.

[0047] Specifically, the voltage and current monitoring device 21 is used to receive the small secondary current transmitted by the current transformer 3, calculate the large primary current based on the small secondary current, and transmit the current parameters of the multiple battery packs 4 as a whole to the battery concentrator 23. The communication converter 22 is used to receive the parameters of the individual battery packs 4 transmitted by the parameter sensor 5, convert them into signals that can be recognized by the battery concentrator 23 and the host computer 1, and transmit them to the battery concentrator 23.

[0048] Continue to see Figure 3 Optionally, the data transmission module 2 also includes a battery concentrator 23, which is connected to the voltage and current monitoring device 21 and the communication converter 22. The battery concentrator 23 is used to transmit data received from the voltage and current monitoring device 21 and the communication converter 22 to the host computer 1.

[0049] Specifically, the current transformer 3 senses the large primary current of the multiple battery packs 4 and generates a corresponding small secondary current, which is transmitted to the voltage and current monitoring device 21 for detection. The current monitoring device 21 calculates the parameters of the large primary current based on the small secondary current and uploads them to the host computer 1 via the battery concentrator 23. Each parameter sensor 5 detects the parameters of the corresponding battery pack 4 cell and transmits them to the communication converter 22. The communication converter 22 converts the parameters of the battery pack 4 cell into a signal that can be recognized by the battery concentrator 23 and the host computer 1, and uploads them to the host computer 1 via the battery concentrator 23. The host computer 1 determines which battery pack 4 has an abnormality based on the current parameters of the multiple battery packs 4 as a whole and the parameters of the individual battery packs 4. By controlling the switching circuit of the transfer switch 42, the abnormal battery pack 4 can be isolated from the other battery packs 4. The host computer 1 changes the number of connected battery bodies 41 in sequence by controlling the conversion switch 42 in the abnormal battery pack 4, and continues to receive data transmitted by the parameter sensor 5 corresponding to the abnormal battery pack 4. The host computer 1 confirms the abnormal battery pack body 41 based on the data transmitted by the parameter sensor 5 after each switching of the conversion switch 42.

[0050] The technical solution of this embodiment is to group a huge number of battery bodies, connect multiple battery bodies in series, set conversion switches to form a battery pack, and reasonably connect multiple battery packs with parameter sensors, so as to save the number of parameter sensors and save costs; by switching the conversion switches and reasonably setting the lines, the number of connection lines can be reduced. For example, when the number of battery bodies in the battery pack is 5, the number of cables required is 20, but since the conversion switches are set to regularize the lines, only 19 cables are needed, saving 1 connection cable as a whole. The more battery groups in the battery pack, the more cables can be saved. The number of battery bodies in the substation is as high as one or two hundred, so a large number of cables can be saved as a whole, the speed of device layout is accelerated, and the intensity of work is reduced.

[0051] An embodiment of the present invention further provides a monitoring method for a lead-acid battery monitoring device for a substation, which can be performed by the lead-acid battery monitoring device for a substation described in any of the above embodiments. Figure 4 This is a flow chart of a monitoring method for a lead-acid battery monitoring device for a substation provided by an embodiment of the present invention. Figure 4 , monitoring methods include:

[0052] S101: The host computer receives parameter information of the battery pack through a data transmission module.

[0053] Specifically, the data transmission module receives the current of the entire battery pack detected by the current transformer and the parameter information of the battery pack cells detected by the parameter sensor, and uploads them to the host computer.

[0054] S102: The host computer determines the abnormal battery pack according to the parameter information of the battery packs, and controls the corresponding conversion switch to switch the circuit to disconnect the abnormal battery pack from the circuits of the other battery packs.

[0055] Specifically, the upper computer determines the battery group with the abnormality based on the parameter information of the battery group, and controls the switching circuit of the conversion switch corresponding to the battery group with the abnormality, so that the circuit from the negative pole of the battery body connected to the end in the previous battery group - the conversion switch in the battery group with the abnormality - the positive pole of the battery body connected to the head end in the battery group with the abnormality is disconnected, and the circuit from the negative pole of the battery body connected to the end in the previous battery group - the conversion switch in the battery group with the abnormality - the conversion switch in the next battery group is connected, thereby disconnecting the battery group with the abnormality from the circuits of the remaining battery groups.

[0056] S103: The host computer switches the lines of the connected battery bodies in sequence by controlling the switching switches in the abnormal battery pack, and receives the parameters of the battery pack cells detected by the parameter sensors.

[0057] For example, if the abnormal battery pack contains five battery cells, the host computer controls the transfer switch to first disconnect the circuit of one battery cell, leaving four battery cells connected. The host computer then receives the battery cell parameters detected by the parameter sensor. The host computer then controls the transfer switch to disconnect the circuit of another battery cell, leaving three battery cells connected. The host computer then receives the battery cell parameters detected by the parameter sensor. And so on.

[0058] S104: The host computer determines the abnormal battery body according to the parameters of the battery pack.

[0059] Specifically, the host computer determines the abnormal battery body according to the parameters of the battery pack monomer received after each switching of the conversion switch, so as to facilitate the operator to replace the battery body.

[0060] The technical solution of this embodiment receives data detected by the current transformer and the parameter sensor through the data transmission module and uploads it to the host computer. The host computer changes the number of connected battery bodies by switching the conversion switch and receives the parameters of the battery pack cells detected by the parameter sensor. The host computer can determine the abnormal battery body based on the parameters of the battery pack cells received after each switching of the conversion switch, thereby realizing the detection of abnormal battery bodies without power outage, so as to replace them and avoid the impact of power outage of the entire substation on power supply.

[0061] Figure 5 This is a flow chart of another monitoring method for a lead-acid battery monitoring device for a substation provided by an embodiment of the present invention. Figure 5 , the method comprising:

[0062] S201: The host computer receives the overall current parameters of the battery pack detected by the current transformer through the voltage and current monitoring device.

[0063] Specifically, current transformers sense the high primary currents of multiple battery packs and generate corresponding low secondary currents, which are transmitted to the voltage and current monitoring device for detection. The voltage and current monitoring device calculates the high primary current parameters based on the low secondary current output by the current transformers and uploads these to a host computer via the battery concentrator, thereby determining the overall current parameters for the multiple battery packs.

[0064] S202: The host computer receives the parameters of the corresponding battery cells detected by the parameter sensor.

[0065] Specifically, each parameter sensor detects the corresponding battery cell parameter and transmits it to the communication converter. These battery cell parameters may include voltage and internal resistance. The communication converter converts these battery cell parameters into signals recognizable by the battery concentrator and the host computer, which are then uploaded to the host computer via the battery concentrator.

[0066] S203: The host computer determines the abnormal battery pack according to the parameter information of the battery packs, and controls the corresponding conversion switch to switch the circuit to disconnect the abnormal battery pack from the circuits of the other battery packs.

[0067] S204 , the host computer controls the switching switch in the abnormal battery pack to disconnect the circuit of any battery body first, and receives the parameters of the battery pack single body detected by the parameter sensor at this time.

[0068] For example, if the abnormal battery pack contains 5 battery bodies, the host computer controls the conversion switch in the abnormal battery pack to first disconnect the line of any battery body. At this time, the remaining 4 battery bodies are connected, and the host computer receives the parameters of the battery pack cells detected by the parameter sensor at this time.

[0069] S205: If the parameters of the battery cell are abnormal, control the transfer switch to disconnect the line of another battery body and receive the parameters of the battery cell detected by the parameter sensor at this time. Repeat this step until the parameters of all battery cells are obtained.

[0070] Specifically, if the host computer receives the battery cell parameters detected by the parameter sensor and confirms that the battery cell parameters are abnormal, it indicates that one of the four connected battery cells is still abnormal. The host computer then controls the transfer switch to disconnect the circuit of another battery cell, leaving three battery cells connected. The host computer then receives the battery cell parameters detected by the parameter sensor and repeats this process until the parameters of all battery cells are obtained.

[0071] S206: The host computer determines the abnormal battery body according to the parameters of the battery pack.

[0072] The technical solution of this embodiment receives data detected by the current transformer and the parameter sensor through the data transmission module and uploads it to the host computer. The host computer changes the number of connected battery bodies by switching the conversion switch and receives the parameters of the battery pack cells detected by the parameter sensor. The host computer can determine the abnormal battery body based on the parameters of the battery pack cells received after each switching of the conversion switch, thereby realizing the detection of abnormal battery bodies without power outage, so as to replace them and avoid the impact of power outage of the entire substation on power supply.

[0073] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0074] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A lead-acid battery monitoring device for a substation, characterized in that: include: Host computer, data transmission module, current transformer, multiple battery packs, and multiple parameter sensors; The host computer is connected to the data transmission module; The current transformer is connected to the battery pack, and the current transformer is used to detect the current of the battery pack; The data transmission module is connected to the current transformer, and is also connected to the parameter sensor, and is used to transmit the received data detected by the current transformer to the host computer; Each parameter sensor is connected to the corresponding battery pack, and a plurality of parameter sensors are connected in series, and the parameter sensors are used to detect the parameters of the corresponding battery pack cells; Each of the battery packs includes a plurality of battery bodies and a switching switch, wherein the plurality of battery packs are connected in series; the switching switch is used to switch the number of battery bodies in the battery pack connected to the corresponding parameter sensor; The host computer is further configured to control the switch in the abnormal battery pack to first disconnect the circuit of any one of the battery bodies, and receive the parameters of the battery pack cells detected by the parameter sensor at this time; If the parameters of the battery pack cells are abnormal, the switching switch is controlled to disconnect the circuit of another battery body, and the parameters of the battery pack cells detected by the parameter sensor are received. This step is repeated until the parameters of all the battery pack cells are obtained.

2. The device according to claim 1, characterized in that The conversion switch is connected in series with the negative electrodes of the plurality of battery bodies in the corresponding battery pack; the conversion switch is also connected with the parameter sensor corresponding to the battery pack.

3. The device according to claim 2, characterized in that The transfer switch is also respectively connected to the previous transfer switch, the negative pole of the battery body connected to the end of the previous battery pack, the positive pole of the battery body connected to the head end of the battery pack where it is located, and the next transfer switch.

4. The device according to claim 1, characterized in that The parameter sensor is also connected to the positive electrode of the battery body corresponding to the connection head end in the battery pack.

5. The device according to claim 1, characterized in that The data transmission module includes a voltage and current monitoring device and a communication converter; The voltage and current monitoring device is connected to the current transformer, and is used to monitor the current parameters of the battery packs as a whole according to the current transmitted by the current transformer; The communication converter is connected to the parameter sensor and is used for performing signal conversion, converting the signal transmitted by the parameter sensor into a signal that can be recognized by the battery concentrator and the upper function.

6. The device according to claim 5, characterized in that The data transmission module further includes a battery concentrator connected to the voltage and current monitoring device and the communication converter, and configured to transmit data received from the voltage and current monitoring device and the communication converter to the host computer.

7. A monitoring method for a lead-acid battery monitoring device in a substation, characterized in that: The monitoring method is performed by the substation lead-acid battery monitoring device according to any one of claims 5 to 6; the monitoring method includes: The host computer receives the parameter information of the battery pack through the data transmission module; The host computer determines the battery pack having an abnormality according to the parameter information of the battery packs, and controls the corresponding conversion switch to switch the circuit to disconnect the battery pack having an abnormality from the circuits of the other battery packs; The host computer sequentially switches the lines of the connected battery bodies by controlling the switching switches in the abnormal battery pack, and receives the parameters of the battery pack cells detected by the parameter sensors; The host computer determines the battery body having an abnormality according to the parameters of the battery pack monomer; The host computer controls the switching switch in the abnormal battery pack to sequentially switch the lines of the connected battery bodies and receives the parameters of the battery pack cells detected by the parameter sensor, including: The host computer controls the switching switch in the abnormal battery pack to disconnect the circuit of any one of the battery bodies, and receives the parameters of the battery pack single body detected by the parameter sensor at this time; If the parameters of the battery pack cells are abnormal, the switching switch is controlled to disconnect the circuit of another battery body, and the parameters of the battery pack cells detected by the parameter sensor are received. This step is repeated until the parameters of all the battery pack cells are obtained.

8. The monitoring method according to claim 7, characterized in that: The host computer receives the parameter information of the battery pack through the data transmission module, including: The host computer receives the current parameter of the entire battery pack detected by the current transformer through the voltage and current monitoring device; The host computer receives the parameters corresponding to the battery pack cells detected by the parameter sensor.

9. The monitoring method according to claim 8, characterized in that: The host computer receives the overall current parameters of the battery pack detected by the current transformer through the voltage and current monitoring device, including: The host computer controls the voltage and current monitoring device to calculate the primary side large current according to the secondary side small current output by the current transformer, thereby obtaining the overall current parameters of the multiple battery packs.

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