A device for on-line monitoring of a battery pack and a method of use thereof

Abstract

The application discloses a device for online monitoring of battery groups and a use method thereof, and relates to the technical field of battery monitoring.The device comprises an online monitoring platform and a monitoring circuit.The monitoring circuit is used for integrating a voltmeter, a plurality of first switches and a plurality of second switches, and is used for voltage detection of a plurality of battery groups.The device for online monitoring of battery groups and the use method thereof are characterized in that, through the setting of the voltmeter, the plurality of first switches and the plurality of second switches, and through the opening and closing adjustment of the first switches and the second switches under the cooperation of the online monitoring platform, voltage detection of individual batteries in the battery groups is realized, and the voltage of the individual batteries can be monitored in an individual measurement mode and an overall measurement mode through the opening and closing adjustment of different first switches and second switches, so that the monitoring mode is diversified, and the voltage monitoring can be facilitated through mode switching.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery monitoring, in particular to a device for online monitoring of a battery pack and a method of use thereof. BACKGROUND

[0002] The battery of a substation is used as a backup power source in a power supply system, and is a direct current power supply. When the main power supply system fails, the secondary system in the power system maintains its normal operation through the power supply of the battery. As the only device for supplying power to the direct current system in the power system and the communication system, the performance of the battery directly relates to the safety and reliability of the power system and the communication system. In many cases, the battery of the substation is actually in a long-term state of complete maintenance. The battery pack will rapidly fail due to reasons such as dry heating, liquid leakage, undercharging, over-discharging, and increased internal resistance of individual batteries during operation, causing the system or power supply equipment to fail to operate normally or causing a major accident. Therefore, it is necessary and essential to regularly detect and monitor the battery, which is an important link that cannot be ignored.

[0003] Currently, the management of the battery of a substation mainly adopts a checking discharge test to test the capacity of the battery, and there is also a method of periodically replacing the battery to prevent power supply system failures caused by insufficient battery capacity. The checking discharge test takes a long time, and the periodic replacement of the battery causes waste of battery resources and economic losses, and has certain defects.

[0004] Based on the above data detection, a device for online monitoring of a battery pack and a method of use thereof are provided, which realizes voltage detection of charging and discharging of the battery during use, provides continuous and stable judgment for testing of the capacity of the battery, and provides stable support for voltage signal monitoring of individual cells in the charging and discharging test of the battery pack. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides a device for online monitoring of a battery pack and a method of use thereof, which solves the problems of long time consumption and easy resource waste in the voltage detection of individual batteries in a traditional battery pack.

[0007] (II) Technical solutions

[0008] In order to achieve the above object, the present application is realized by the following technical scheme: a device for online monitoring of battery pack, comprising an online monitoring platform and a monitoring circuit, the monitoring circuit is used for integrating a voltmeter, a plurality of first switches and a plurality of second switches, for voltage detection of a plurality of battery packs, the plurality of second switches are arranged in series with the voltmeter, two first switches are arranged on both sides of a single battery in the battery pack and are arranged in parallel with the second switch;

[0009] The online monitoring platform is used for controlling the opening and closing of the first switch and the second switch, and recording the measurement results of the voltmeter.

[0010] The present application is further provided that: the online monitoring platform comprises a switch control unit, a monitoring unit, a monitoring switching unit, an accumulation elimination unit, a data storage module and a data reference display module, the switch control unit is connected with the monitoring unit, the monitoring unit is connected with the monitoring switching unit, the monitoring switching unit is connected with the data storage module, the data storage module and the data reference display module are connected, and the monitoring unit is connected with the accumulation elimination unit.

[0011] The data storage module is used for storing the actual measured voltage value.

[0012] The data reference display module is used for setting a voltage standard value as an alarm threshold, comparing the actual measured voltage value with the alarm threshold, and issuing an abnormal alarm when the alarm threshold is exceeded.

[0013] The present application is further provided that: the switch control unit comprises a first switch integration module, a battery identification module and a second switch integration module, and the first switch integration module and the second switch integration module are connected with the battery identification module.

[0014] The present application is further provided that: the first switch integration module is used for sorting and marking a plurality of first switches.

[0015] The second switch integration module is used for sorting and marking a plurality of second switches.

[0016] The battery identification module is used for sorting and marking a plurality of batteries constituting the battery pack, establishing a mapping relationship between the second switch and the battery sorting mark, and establishing a position corresponding relationship between the plurality of first switches and the battery sorting mark.

[0017] The present application is further provided that: the monitoring unit comprises an identification recognition module, a logic setting module, a logic storage module and a switch on-off control module, the identification recognition module and the logic setting module are connected with the logic storage module, and the logic storage module is connected with the switch on-off control module.

[0018] The application is further provided with: the logic setting module is used for setting a single measurement mode and a whole measurement mode, wherein the single measurement mode is used for closing two first switches adjacent to a corresponding battery serial number, opening a second switch corresponding to the battery serial number to be measured, then closing all the remaining second switches to form a voltage single measurement loop of the battery to be measured, and monitoring the voltage of the battery to be measured; the whole measurement mode is used for keeping the leftmost first switch closed, then opening the adjacent first switches in sequence, and opening the adjacent second switches in sequence to measure the voltage of the Nth battery and the N+1th battery, and calculating the voltage of the N+1th battery in a difference mode;

[0019] The logic storage module is used for storing the running logic of the single measurement mode and the whole measurement mode.

[0020] The identification module is used for identifying the battery serial number to be monitored, transmitting the identification result to the logic storage module, and finding the running logic of the battery voltage detection of the corresponding serial number from the single measurement mode and the whole measurement mode according to the identification result.

[0021] The switch on-off control module is used for controlling the opening and closing of the first switch and the second switch according to the running logic.

[0022] The application is further provided with: the accumulation elimination unit includes a single measurement recording module and an accumulated error cleaning module, and the single measurement recording module is connected with the accumulated error cleaning module.

[0023] The single measurement recording module is used for measuring the voltage of a single battery in the battery pack according to the running logic of the single measurement mode, and recording the corresponding voltage measurement result.

[0024] The accumulated error cleaning module is used for calculating the voltage of a single battery in the battery pack according to the running logic of the whole measurement mode, calculating the difference between the voltage measurement results of the batteries with the same serial number and the voltage measurement results recorded in the single measurement recording module as an error value, and subtracting the error value when calculating the voltage of a single battery in the battery pack according to the running logic of the whole measurement mode to obtain the actual voltage value.

[0025] The application is further provided with: the monitoring switching unit includes a time length setting module, a mode switching module, a single monitoring module and an integrated monitoring module, the time length setting module is connected with the mode switching module, and the mode switching module is connected with the single monitoring module and the integrated monitoring module.

[0026] The time length setting module is used for setting the running time length of the single measurement mode and the whole measurement mode.

[0027] The mode switching module is used for sending the voltage monitoring of the battery pack in the integral measurement mode as an output instruction to the integrated monitoring module after the single measurement mode reaches the set running length, and sending the voltage monitoring of the battery pack in the single measurement mode as an output instruction to the single monitoring module after the integral measurement mode reaches the set running length.

[0028] The single monitoring module is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the single measurement mode.

[0029] The integrated monitoring module is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the integral measurement mode.

[0030] (Three) beneficial effects

[0031] The application provides a device for online monitoring of a battery pack and a use method thereof.

[0032] (1) The application realizes the voltage detection of the single battery in the battery pack through the setting of the voltmeter, the first switch and the second switch, and the opening and closing adjustment of the first switch and the second switch under the cooperation of the online monitoring platform. In addition, the voltage of the single battery can be monitored in the single measurement mode and the integral measurement mode through the opening and closing adjustment of different first switches and second switches, so that the monitoring mode is diversified, and the precise and convenient conditions for voltage monitoring are provided through the mode switching.

[0033] (2) The application provides the convenient conditions for the voltage monitoring of the single battery through the setting of the integral measurement mode and the auxiliary difference calculation, and the single measurement mode has simpler switch opening and closing control instructions, so that the use is convenient. In addition, the measurement error can be processed through the setting of the accumulation elimination unit, so that the accuracy of the actual measurement voltage value is ensured.

[0034] (3) The application sets the alarm threshold value, compares the alarm threshold value with the actually measured voltage value, and provides effective data support for the detection of the abnormal battery. DETAILED DESCRIPTION

[0035] Figure 1 It is a layout diagram of the monitoring circuit of the application.

[0036] Figure 2 It is a system principle block diagram of the online monitoring platform of the application.

[0037] Figure 3 It is a system principle block diagram of the switch control unit of the application.

[0038] Figure 4 System principle block diagram of the monitoring unit of the present application;

[0039] Figure 5 System principle block diagram of the monitoring switching unit of the present application;

[0040] Figure 6 System principle block diagram of the accumulation elimination unit of the present application;

[0041] Figure 7 Schematic diagram of on-off control of switches in overall detection of the embodiment of the present application;

[0042] Figure 8 Schematic diagram of on-off control of switches in separate detection of the embodiment of the present application.

[0043] In the figure, 1, online monitoring platform; 2, monitoring circuit; 3, voltmeter; 4, first switch; 5, second switch; 6, switch control unit; 7, monitoring unit; 8, monitoring switching unit; 9, accumulation elimination unit; 10, data storage module; 11, data reference display module; 12, first switch integration module; 13, storage battery identification module; 14, second switch integration module; 15, identification recognition module; 16, logic setting module; 17, switch on-off control module; 18, single measurement recording module; 19, accumulation error cleaning module; 20, time length setting module; 21, mode switching module; 22, single monitoring module; 23, integrated monitoring module; 24, logic storage module. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application.

[0045] Please refer to Figures 1-8 The embodiment of the present application provides the following technical solutions:

[0046] Embodiment one, a device for online monitoring of a storage battery pack, comprising a monitoring circuit 2, in order to facilitate voltage testing of the storage battery pack, the monitoring circuit 2 is arranged, the monitoring circuit 2 integrates a voltmeter 3, a plurality of first switches 4 and a plurality of second switches 5.

[0047] As a detailed description, as shown in the accompanying Figure 1 The plurality of second switches 5 are arranged in series with the voltmeter 3, and the two first switches 4 are arranged on the two sides of a single storage battery in the storage battery pack and in parallel with the second switches 5, so that by controlling the opening and closing of the first switches 4 and the second switches 5, voltage testing of different storage batteries can be realized.

[0048] As a further description, the voltage testing includes the following two kinds:

[0049] I. Single voltage test of the battery:

[0050] Referring to the accompanying drawings Figure 7 Wherein the box with positive and negative electrode marks is a single battery, select the battery to be measured, close the two first switches 4 adjacent to the battery, disconnect the remaining first switches 4, disconnect the second switch 5 corresponding to the serial number of the battery, disconnect the second switch 5 corresponding to the serial number of the battery to be measured, that is, disconnect the second switch 5 directly above the battery, and then close all the remaining second switches 5 to form a single voltage measurement loop for the battery to be measured, and monitor the voltage of the battery to be measured;

[0051] II. Collective voltage monitoring of several batteries:

[0052] Referring to the accompanying drawings Figure 8 Wherein the box with positive and negative electrode marks is a single battery, keep the first switch 4 on the left side closed, then open the adjacent first switch 4 in turn, and disconnect the adjacent second switch 5, measure the voltage of the Nth battery and the N+1th battery, and calculate the voltage of the N+1th battery in a difference mode. At this time, after measuring the overall voltage of the left two single batteries A, open the third first switch 4 on the left side, close the fourth first switch 4 on the left side, and disconnect the third second switch 5 on the left side. At this time, the overall voltage of the left three single batteries B is measured, and after B is subtracted from A, the voltage value of the third single battery is obtained.

[0053] In this embodiment, by arranging the monitoring circuit 2 and controlling the opening and closing of the switches, diversified voltage detection of the battery can be realized.

[0054] Embodiment two, as an improvement of the previous embodiment, a device for online monitoring of the battery pack further comprises an online monitoring platform 1 composed of a switch control unit 6, a monitoring unit 7, a monitoring switching unit 8, an accumulation elimination unit 9, a data storage module 10 and a data reference display module 11. The online monitoring platform 1 is used for automatic opening and closing control of the first switch 4 and the second switch 5, so as to achieve the purpose of automatic voltage detection of the battery.

[0055] As a preferred scheme, in order to better manage the first switch 4 and the second switch 5, the switch control unit 6 comprises a first switch integration module 12, a battery identification module 13 and a second switch integration module 14. The first switch integration module 12 is used for serially marking a plurality of first switches 4;

[0056] The second switch integration module 14 is used for serially marking a plurality of second switches 5;

[0057] The first switch integrated module 12 and the second switch integrated module 14 are connected with the battery identification module 13, and the battery identification module 13 is used for sorting and marking a plurality of batteries constituting a battery pack, establishing a mapping relationship between the second switch 5 and the battery sorting mark, and establishing a position corresponding relationship between a plurality of first switches 4 and the battery sorting mark.

[0058] As a preferred solution, in order to realize the on-off control of the first switch 4 and the second switch 5, the switch control unit 6 is connected with the monitoring unit 7, and the monitoring unit 7 includes an identification recognition module 15, a logic setting module 16, a logic storage module 24 and a switch on-off control module 17. The logic setting module 16 is used for setting a separate measurement mode and a whole measurement mode, wherein the separate measurement mode is used for closing the adjacent two first switches 4 corresponding to the battery sorting mark to be measured, then opening the second switch 5 corresponding to the battery sorting mark to be measured, then closing all the remaining second switches 5, thereby forming a voltage separate measurement loop of the battery to be measured, and monitoring the voltage of the battery to be measured; the whole measurement mode is used for keeping the first switch 4 on the left side always closed, then opening the adjacent first switch 4 in turn, and then opening the adjacent second switch 5 in turn, thereby measuring the voltage of the Nth battery and the N+1th battery, and calculating the voltage of the N+1th battery in a difference mode;

[0059] The logic setting module 16 is connected with the logic storage module 24, and the logic storage module 24 is used for storing the running logic of the separate measurement mode and the whole measurement mode;

[0060] The identification recognition module 15 is connected with the logic storage module 24, and the identification recognition module 15 is used for identifying the battery sorting mark to be monitored, transmitting the identification result to the logic storage module 24, and finding the running logic of the voltage detection of the battery with the corresponding sorting mark from the separate measurement mode and the whole measurement mode according to the identification result;

[0061] The logic storage module 24 is connected with the switch on-off control module 17, and the switch on-off control module 17 is used for controlling the on-off of the first switch 4 and the second switch 5 according to the running logic.

[0062] As a preferred solution, in order to improve the reliability of the voltage detection result, the monitoring unit 7 is connected with the monitoring switching unit 8, and the monitoring switching unit 8 includes a time length setting module 20, a mode switching module 21, a single monitoring module 22 and an integrated monitoring module 23. The time length setting module 20 is used for setting the running time length of the separate measurement mode and the whole measurement mode.

[0063] The time length setting module 20 is connected with the mode switching module 21, and the mode switching module 21 is used for sending the voltage monitoring of the battery pack as an output instruction to the integrated monitoring module 23 in the overall measurement mode after the single measurement mode reaches the set running time length, and sending the voltage monitoring of the battery pack as an output instruction to the single monitoring module 22 in the single measurement mode after the overall measurement mode reaches the set running time length;

[0064] The mode switching module 21 is connected with the single monitoring module 22, and the single monitoring module 22 is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the single measurement mode;

[0065] The mode switching module 21 is connected with the integrated monitoring module 23, and the integrated monitoring module 23 is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the overall measurement mode.

[0066] As a preferred solution, the monitoring switching unit 8 is connected with the data storage module 10, the data storage module 10 is used for storing the actually measured voltage value, the data storage module 10 is connected with the data reference display module 11, the data reference display module 11 is used for setting the voltage standard value as an alarm threshold, comparing the actually measured voltage value with the alarm threshold, and issuing an abnormal alarm when the alarm threshold is exceeded.

[0067] As a preferred solution, in order to ensure the accuracy of the collected voltage data in the overall measurement mode, the monitoring unit 7 is connected with the accumulation elimination unit 9, the accumulation elimination unit 9 includes the single measurement recording module 18 and the accumulation error cleaning module 19, the single measurement recording module 18 is used for measuring the voltage of the single battery in the battery pack according to the running logic of the single measurement mode and recording the corresponding voltage measurement result;

[0068] The single measurement recording module 18 is connected with the accumulation error cleaning module 19, and the accumulation error cleaning module 19 is used for calculating the voltage of the single battery in the battery pack according to the running logic of the overall measurement mode, calculating the difference between the voltage measurement results of the batteries with the same sequence number and the voltage measurement results recorded in the single measurement recording module 18 as error values, and subtracting the error values when calculating the voltage of the single battery in the battery pack according to the running logic of the overall measurement mode to obtain the actual voltage value.

[0069] The advantage of the embodiment over the previous embodiment is that the automatic detection of the battery voltage in different modes can be realized, and the detection efficiency is higher.

[0070] The battery pack automatic voltage detection method based on the monitoring circuit 2 specifically includes the following steps:

[0071] S1, switch control: the first switch integrated module 12 sorts and marks a plurality of first switches 4, the second switch integrated module 14 sorts and marks a plurality of second switches 5, the battery identification module 13 sorts and marks a plurality of batteries constituting the battery pack, establishes the mapping relationship between the second switch 5 and the battery sorting mark, and establishes the position corresponding relationship between the plurality of first switches 4 and the battery sorting mark;

[0072] S2, voltage monitoring: the logic setting module 16 sets the individual measurement mode and the overall measurement mode, and the running logic of the individual measurement mode and the overall measurement mode is stored in the logic storage module 24; when the individual measurement mode reaches the running time set by the time setting module 20, the mode switching module 21 will send the voltage monitoring of the battery pack as the output instruction to the integrated monitoring module 23 according to the overall measurement mode; the integrated monitoring module 23 receives the output instruction and goes to S3;

[0073] After the overall measurement mode reaches the set running time, the mode switching module 21 will send the voltage monitoring of the battery pack as the output instruction to the single monitoring module 22 according to the individual measurement mode; the single monitoring module 22 receives the output instruction and goes to S4;

[0074] S3, overall detection: the identification recognition module 15 identifies the battery sorting number to be monitored, transmits the identification result to the logic storage module 24, and according to the identification result, finds the running logic of the corresponding sorting number battery voltage detection from the overall measurement mode; the switch on-off control module 17 keeps the first switch 4 on the left side always closed, then opens the adjacent first switch 4 in turn, and disconnects the adjacent second switch 5 in turn, measures the voltage of the Nth battery and the N+1th battery, and calculates the voltage of the N+1th battery in the form of difference, as shown in the accompanying drawings. Figure 8

[0075] S4, individual detection: the identification recognition module 15 identifies the battery sorting number to be monitored, transmits the identification result to the logic storage module 24, and according to the identification result, finds the running logic of the corresponding sorting number battery voltage detection from the individual measurement mode; the individual measurement mode is used to close the adjacent two first switches 4 of the corresponding battery sorting number according to the battery sorting number to be measured, disconnect the remaining first switches 4, and disconnect the second switch 5 corresponding to the battery sorting number to be measured, as shown in the accompanying drawings.​Figure 7 As shown in the figure, the square box with positive and negative electrode marks is a single battery, and the second switch 5 corresponding to the serial number of the battery to be measured is disconnected, that is, the second switch 5 directly above the battery is disconnected, and then all the remaining second switches 5 are closed, thereby forming a single voltage measurement loop of the battery to be measured, and the voltage of the battery to be measured is monitored.

[0076] S5, error elimination: the single measurement recording module 18 performs single voltage measurement on the single battery in the battery pack according to the operation logic of the single measurement mode in S5, and records the corresponding voltage measurement result, and the error elimination module 19 performs voltage calculation on the single battery in the battery pack according to the operation logic of the overall measurement mode in S3, and calculates the difference between the voltage measurement results of the batteries with the same serial number and the voltage measurement results recorded in the single measurement recording module 18 as error values, and subtracts the error values when performing voltage calculation on the single battery in the battery pack according to the operation logic of the overall measurement mode, to obtain the actual voltage value.

[0077] S6: comparison and display: the voltage detection result obtained in S4 and the actual voltage value collected in S5 are both stored in the data storage module 10 as actual measurement voltage values, the data reference display module 11 sets a voltage standard value as an alarm threshold, and compares the actual measurement voltage value with the alarm threshold, and issues an abnormal alarm when the alarm threshold is exceeded.

[0078] As described above, the application can realize automatic single voltage detection of several batteries in the battery pack, and can also realize automatic overall voltage detection, which can effectively eliminate measurement errors while ensuring the accuracy of voltage detection.

[0079] It should be noted that, in this text, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0080] Although the embodiments of the application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A device for online monitoring of a battery pack, comprising an online monitoring platform (1) and a monitoring circuit (2), characterized in that: The monitoring circuit (2) is used for integrating a voltmeter (3), a plurality of first switches (4) and a plurality of second switches (5) for voltage detection of a plurality of battery groups, the plurality of second switches (5) are arranged in series with the voltmeter (3), and two first switches (4) are arranged on the two sides of a single battery in the battery group and in parallel with the second switch (5); The online monitoring platform (1) is used for controlling the opening and closing of the first switch (4) and the second switch (5) and recording the measurement results of the voltmeter (3); The online monitoring platform (1) comprises a switch control unit (6), a monitoring unit (7), a monitoring switching unit (8), an accumulation elimination unit (9), a data storage module (10) and a data reference display module (11), the switch control unit (6) is connected with the monitoring unit (7), the monitoring unit (7) is connected with the monitoring switching unit (8), the monitoring switching unit (8) is connected with the data storage module (10), the data storage module (10) and the data reference display module (11) are connected, and the monitoring unit (7) is connected with the accumulation elimination unit (9); The data storage module (10) is used for storing the actually measured voltage value; The data reference display module (11) is used for setting a voltage standard value as an alarm threshold, comparing the actually measured voltage value with the alarm threshold, and issuing an abnormal alarm when the alarm threshold is exceeded; The switch control unit (6) comprises a first switch integration module (12), a battery identification module (13) and a second switch integration module (14); The first switch integration module (12) is used for sorting and marking a plurality of first switches (4); The second switch integration module (14) is used for sorting and marking a plurality of second switches (5); The battery identification module (13) is used for sorting and marking a plurality of batteries constituting a battery group, establishing a mapping relationship between the second switch (5) and the battery sorting mark, and establishing a position corresponding relationship between the plurality of first switches (4) and the battery sorting mark; The monitoring unit (7) comprises an identification recognition module (15), a logic setting module (16), a logic storage module (24) and a switch on-off control module (17); The logic setting module (16) is used for setting a single measurement mode and a whole measurement mode, wherein the single measurement mode is used for closing two first switches (4) adjacent to a battery sorting mark corresponding to a to-be-measured battery, then opening a second switch (5) corresponding to the battery sorting mark, then closing all the remaining second switches (5) to form a voltage single measurement loop of the to-be-measured battery, and monitoring the voltage of the to-be-measured battery; and the whole measurement mode is used for keeping a leftmost first switch (4) always closed, then opening adjacent first switches (4) in sequence, and then opening adjacent second switches (5) in sequence, measuring the voltages of an Nth battery and an N+1th battery, and calculating the voltage of the N+1th battery in a difference mode. The logic storage module (24) is used for storing the running logic of the individual measurement mode and the overall measurement mode; The identification recognition module (15) is used for identifying the sorting mark of the battery to be monitored, transmitting the identification result to the logic storage module (24), and finding the running logic of the battery voltage detection corresponding to the sorting mark from the individual measurement mode and the overall measurement mode according to the identification result; The switch on-off control module (17) is used for controlling the opening and closing of the first switch (4) and the second switch (5) according to the running logic; The accumulation elimination unit (9) comprises a single measurement recording module (18) and an accumulated error cleaning module (19); The single measurement recording module (18) is used for measuring the voltage of the individual battery in the battery pack according to the running logic of the individual measurement mode, and recording the corresponding voltage measurement result; The accumulated error cleaning module (19) is used for calculating the voltage of the individual battery in the battery pack according to the running logic of the overall measurement mode, calculating the difference between the voltage measurement results of the batteries with the same sorting mark and the voltage measurement results recorded in the single measurement recording module (18) as error values, and subtracting the error values when calculating the voltage of the individual battery in the battery pack according to the running logic of the overall measurement mode to obtain the actual voltage value; The monitoring switching unit (8) comprises a time length setting module (20), a mode switching module (21), a single monitoring module (22) and an integrated monitoring module (23); The time length setting module (20) is used for setting the running time length of the individual measurement mode and the overall measurement mode; The mode switching module (21) is used for sending the voltage monitoring of the battery pack according to the overall measurement mode as an output instruction to the integrated monitoring module (23) after the individual measurement mode reaches the set running time length, and sending the voltage monitoring of the battery pack according to the individual measurement mode as an output instruction to the single monitoring module (22) after the overall measurement mode reaches the set running time length; The single monitoring module (22) is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the individual measurement mode; The integrated monitoring module (23) is used for receiving the output instruction and monitoring the voltage of the battery pack according to the running logic of the overall measurement mode.

2. A device for on-line monitoring of a battery pack according to claim 1, characterized in that: The first switch integrated module (12) and the second switch integrated module (14) are connected with the battery identification module (13).

3. A device for on-line monitoring of a battery pack according to claim 1, characterized in that: The identification recognition module (15) and the logic setting module (16) are connected with the logic storage module (24), and the logic storage module (24) is connected with the switch on-off control module (17).

4. The apparatus for on-line monitoring of a battery pack according to claim 1, wherein: The single measurement recording module (18) is connected with the accumulated error cleaning module (19).

5. The apparatus for on-line monitoring of a battery pack of claim 1, wherein: The time length setting module (20) is connected with the mode switching module (21), and the mode switching module (21) is connected with the single monitoring module (22) and the integrated monitoring module (23) respectively.

6. A method of using an apparatus for on-line monitoring of a battery pack, characterized by: Specifically comprising the following steps: S1, circuit layout: in the battery pack, the first switch (4) is connected on both sides of the individual battery, and then the second switch (5) is used to connect the adjacent two first switches (4) in series, and then the leftmost first switch (4) and the rightmost first switch (4) are connected in series with the voltmeter (3), so that several second switches (5) and the voltmeter (3) are distributed in series; S2, switch control: the first switch integrated module (12) sorts and marks the several first switches (4), the second switch integrated module (14) sorts and marks the several second switches (5), the battery identification module (13) sorts and marks the several batteries constituting the battery pack, establishes the mapping relationship between the second switch (5) and the battery sorting mark, and establishes the position corresponding relationship between the several first switches (4) and the battery sorting mark; S3, voltage monitoring: the logic setting module (16) sets the individual measurement mode and the overall measurement mode, the running logic of the individual measurement mode and the overall measurement mode is stored in the logic storage module (24), the mode switching module (21) is used to switch the mode after the individual measurement mode reaches the running time set by the time setting module (20), and the voltage monitoring of the battery pack is sent to the integrated monitoring module (23) as an output instruction according to the overall measurement mode, the integrated monitoring module (23) receives the output instruction, goes to S4, and monitors the voltage of the battery pack according to the running logic of the overall measurement mode; The mode switching module (21) sends the voltage monitoring of the battery pack to the single monitoring module (22) as an output instruction according to the individual measurement mode after the overall measurement mode reaches the set running time, the single monitoring module (22) receives the output instruction, goes to S5, and monitors the voltage of the battery pack according to the running logic of the individual measurement mode; S4, overall detection: the identification recognition module (15) identifies the battery sorting number to be monitored, transmits the identification result to the logic storage module (24), finds the running logic of the corresponding sorting number battery voltage detection from the overall measurement mode according to the identification result, and the switch on-off control module (17) keeps the leftmost first switch (4) closed, then opens the adjacent first switch (4) in turn, and disconnects the adjacent second switch (5) in turn, measures the voltage of the Nth battery and the N+1th battery, and calculates the voltage of the N+1th battery in the form of difference. S5, single detection: the identification recognition module (15) identifies the storage battery order number that needs to be monitored, transmits the identification result to the logical storage module (24), and finds the running logic of the corresponding order number battery voltage detection from the single measurement mode according to the identification result. The single measurement mode is used to close the adjacent two first switches (4) of the corresponding battery order number according to the battery order number to be measured, open the second switch (5) corresponding to the battery order number to be measured, then close all the remaining second switches (5), form the voltage single measurement loop of the battery to be measured, and monitor the voltage of the battery to be measured; S6, accumulated error elimination: the single measurement record module (18) measures the voltage of the single battery in the battery pack according to the running logic of the single measurement mode in S5, and records the corresponding voltage measurement result. The accumulated error cleaning module (19) calculates the voltage of the single battery in the battery pack according to the running logic of the whole measurement mode in S4, calculates the difference between the voltage measurement results of the batteries with the same order number and the voltage measurement results recorded in the single measurement record module (18) as the error value, and subtracts the error value when calculating the voltage of the single battery in the battery pack according to the running logic of the whole measurement mode to obtain the actual voltage value; S7: comparison and display: the voltage detection results obtained in S5 and the actual voltage values collected in S6 are stored in the data storage module (10) as actual measurement voltage values. The data reference display module (11) sets a voltage standard value as an alarm threshold, compares the actual measurement voltage value with the alarm threshold, and issues an abnormal alarm when the alarm threshold is exceeded.

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