Device for on-line monitoring of storage battery pack and use method thereof

Abstract

The invention discloses a device for on-line monitoring of a storage battery pack and a use method thereof, the device comprises an on-line 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 carrying out voltage detection on a plurality of storage battery packs, and the invention relates to the technical field of storage battery monitoring. According to the device for online monitoring of the storage battery pack and the use method of the device, through the arrangement of the voltmeter, the plurality of first switches and the plurality of second switches, under the cooperation of the online monitoring platform, the on-off adjustment of the first switches and the second switches is carried out, so that the voltage detection of independent storage batteries in the storage battery pack is realized; and the voltage of the single storage battery can be monitored in a single measurement mode and an overall measurement mode by adjusting the on-off of different first switches and second switches, so that accurate and convenient conditions can be provided for voltage monitoring through a mode switching mode while the monitoring modes are diversified.

Description

Technical Field

[0001] The present invention relates to the technical field of battery monitoring, and in particular to a device for online monitoring of a battery pack and a method for using the device. Background Art

[0002] Substation batteries are used as backup power in the power supply system. They are a type of DC 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 in the power system and communication system that supplies power to the DC system, its performance is directly related to the safety and reliability of the power system and communication system. In many cases, substation batteries are actually in a state of long-term complete lack of maintenance. During operation, the battery pack will fail quickly due to individual batteries drying up, heating, leakage, undercharging, over-discharging, increased internal resistance, etc., causing the system or power supply equipment to fail to operate normally or major accidents. Therefore, regular inspection and online monitoring of batteries is very necessary and essential, and is an important link that cannot be ignored.

[0003] At present, the management of batteries in substations is mainly through the use of verification discharge tests to test the battery capacity. There is also a method of periodic battery replacement to prevent power supply system failures caused by insufficient battery capacity. The verification discharge test takes a long time, and the periodic replacement of batteries causes waste of battery resources and economic losses, which has certain defects.

[0004] Based on the detection of the above data, a device for online monitoring of battery packs and its use method are proposed to realize the voltage detection of charging and discharging of batteries during use, provide continuous and stable judgment for the test of battery capacity, and provide stable support for the voltage signal monitoring of single cells in the charging and discharging test of battery packs. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a device for online monitoring of a battery pack and a method for using the device, which solves the problem that individual battery voltage detection in a traditional battery pack is time-consuming and prone to waste of resources.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for online monitoring of a battery pack, comprising an online monitoring platform and a monitoring circuit, wherein the monitoring circuit is used to integrate a voltmeter, a plurality of first switches and a plurality of second switches, and is used to perform voltage detection on a plurality of battery packs, wherein the plurality of second switches are arranged in series with the voltmeter, and two of the first switches are respectively arranged on both sides of a single battery in the battery pack, and are arranged in parallel with the second switches;

[0009] The online monitoring platform is used to control the opening and closing of the first switch and the second switch, and to record the measurement results of the voltmeter.

[0010] The present invention is further configured as follows: the online monitoring platform includes 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 to the monitoring unit, the monitoring unit is connected to the monitoring switching unit, the monitoring switching unit is connected to the data storage module, the data storage module is connected to the data reference display module, and the monitoring unit is connected to the accumulation elimination unit;

[0011] The data storage module is used to store the actually measured voltage value;

[0012] The data reference display module is used to set a voltage standard value as an alarm threshold, compare the actually measured voltage value with the alarm threshold, and issue an abnormal alarm when the alarm threshold is exceeded.

[0013] The present invention is further configured as follows: the switch management and control unit includes a first switch integrated module, a battery identification module and a second switch integrated module, and the first switch integrated module and the second switch integrated module are both connected to the battery identification module.

[0014] The present invention is further configured as follows: the first switch integration module is used to sort and mark a plurality of first switches;

[0015] The second switch integration module is used to sort and mark a plurality of second switches;

[0016] The battery identification module is used to sort and mark a number of batteries constituting a battery pack, establish a mapping relationship between the second switch and the battery sorting mark, and establish a position correspondence relationship between a number of first switches and the battery sorting mark.

[0017] The present invention is further configured as follows: the monitoring unit includes 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 both connected to the logic storage module, and the logic storage module is connected to the switch on-off control module.

[0018] The present invention is further configured as follows: the logic setting module is used to set a separate measurement mode and an overall measurement mode, wherein the separate measurement mode is used to close two adjacent first switches corresponding to the battery sorting number according to the battery sorting number to be measured, then disconnect the second switch corresponding to the battery sorting number to be measured, and then close all the remaining second switches to form a separate voltage measurement loop for the battery to be measured, and monitor the voltage of the battery to be measured; the overall measurement mode is used to keep the first switch set on the leftmost side normally closed, then open the adjacent first switches in sequence, and disconnect the adjacent second switches in sequence, measure the voltage of the Nth battery and the N+1th battery, and calculate the voltage of the N+1th battery in a difference manner;

[0019] The logic storage module is used to store the operation logic of the individual measurement mode and the overall measurement mode;

[0020] The identification recognition module is used to identify the battery ranking number that needs to be monitored, transmit the recognition result to the logic storage module, and find the operation logic of the battery voltage detection corresponding to the ranking number from the individual measurement mode and the overall measurement mode according to the recognition result;

[0021] The switch on-off control module is used to control the on-off of the first switch and the second switch according to the operation logic.

[0022] The present invention is further configured as follows: the accumulation elimination unit includes a single-body measurement recording module and an accumulation error cleaning module, and the single-body measurement recording module is connected to the accumulation error cleaning module;

[0023] The single cell measurement recording module is used to perform individual voltage measurements on individual batteries in the battery pack according to the operation logic of the individual measurement mode, and record the corresponding voltage measurement results;

[0024] The accumulated error clearing module is used to calculate the voltage of a single battery in the battery pack according to the operating logic of the overall measurement mode, and to calculate the difference between the voltage measurement result of the battery with the same sorting number and the voltage measurement result recorded in the single measurement recording module as the error value. When calculating the voltage of a single battery in the battery pack according to the operating logic of the overall measurement mode, the error value is subtracted to obtain the actual voltage value.

[0025] The present invention is further configured as follows: the monitoring switching unit includes a duration setting module, a mode switching module, a single-body monitoring module and an integrated monitoring module; the duration setting module is connected to the mode switching module; and the mode switching module is connected to the single-body monitoring module and the integrated monitoring module respectively.

[0026] The present invention is further configured as follows: the duration setting module is used to set the running duration of the individual measurement mode and the overall measurement mode;

[0027] The mode switching module is used to monitor the voltage of the battery pack according to the overall measurement mode as an output instruction to the integrated monitoring module after the individual measurement mode reaches the set running time, and to monitor the voltage of the battery pack according to the individual measurement mode as an output instruction to the single monitoring module after the overall measurement mode reaches the set running time;

[0028] The single-cell monitoring module is used to receive output instructions and monitor the voltage of the battery pack according to the operation logic of the individual measurement mode;

[0029] The integrated monitoring module is used to receive output instructions and monitor the voltage of the battery pack according to the operating logic of the overall measurement mode.

[0030] (III) Beneficial effects

[0031] The present invention provides a device for online monitoring of a battery pack and a method for using the device. The device has the following beneficial effects:

[0032] (1) The present invention, through the arrangement of a voltmeter, a plurality of first switches and a second switch, cooperates with an online monitoring platform, and can realize voltage detection of a single battery in a battery pack by adjusting the opening and closing of the first switch and the second switch. At the same time, the voltage of a single battery can be monitored in a single measurement mode and an overall measurement mode by adjusting the opening and closing of different first switches and the second switch. While the monitoring methods are diversified, accurate and convenient conditions can be provided for voltage monitoring by mode switching.

[0033] (2) The present invention provides convenient conditions for voltage monitoring of individual batteries by setting an overall measurement mode and assisting in difference calculation. Compared with the individual measurement mode, the present invention has simpler switch on / off control instructions and is easy to use. In combination with the setting of the accumulation elimination unit, the present invention can also process measurement errors, thereby ensuring the accuracy of the actual measured voltage value.

[0034] (3) The present invention sets an alarm threshold and compares the alarm threshold with the actual measured voltage value, thereby providing effective data support for the detection of abnormal batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the layout of the monitoring circuit of the present invention;

[0036] Figure 2 It is a system principle block diagram of the online monitoring platform of the present invention;

[0037] Figure 3 This is a system principle block diagram of the switch control unit of the present invention;

[0038] Figure 4 It is a system principle block diagram of the monitoring unit of the present invention;

[0039] Figure 5 This is a system principle block diagram of the monitoring switching unit of the present invention;

[0040] Figure 6 It is a system principle block diagram of the accumulation elimination unit of the present invention;

[0041] Figure 7 A schematic diagram of the on-off control of a switch in the overall detection of an embodiment of the present invention;

[0042] Figure 8 Schematic diagram of on-off control of a switch in a separate detection according to an embodiment of the present invention.

[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. battery identification module; 14. second switch integration module; 15. identification module; 16. logic setting module; 17. switch on-off control module; 18. single-cell measurement and recording module; 19. accumulation error cleaning module; 20. duration setting module; 21. mode switching module; 22. single-cell monitoring module; 23. integrated monitoring module; 24. logic storage module. DETAILED DESCRIPTION

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

[0045] See also Figure 1-8 , the embodiment of the present invention provides the following technical solutions:

[0046] Embodiment 1: A device for online monitoring of a battery pack includes a monitoring circuit 2. In order to facilitate voltage testing of the battery pack, the monitoring circuit 2 is arranged, and the monitoring circuit 2 integrates a voltmeter 3, a plurality of first switches 4, and a plurality of second switches 5.

[0047] As detailed in the attached Figure 1 As shown, several second switches 5 are arranged in series with the voltmeter 3, and two first switches 4 are respectively arranged on both sides of a single battery in the battery pack and are arranged in parallel with the second switch 5. In this way, by controlling the opening and closing of the first switch 4 and the second switch 5, the voltage test of different batteries can be achieved.

[0048] As a further explanation, voltage tests include the following two types:

[0049] 1. Individual voltage test of battery:

[0050] See attached Figure 7 , where the box with positive and negative pole marks is a separate battery, select the battery to be measured, close the two adjacent first switches 4 of the battery, disconnect the remaining first switches 4, disconnect the second switch 5 corresponding to the battery sorting number, disconnect the second switch 5 corresponding to the battery sorting number 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 separate voltage measurement circuit for the battery to be measured, and monitor the voltage of the battery to be measured;

[0051] 2. Collective voltage monitoring of several batteries:

[0052] See attached Figure 8 , where the boxes with positive and negative pole marks are individual batteries, keep the first switch 4 set on the far left normally closed, then open the adjacent first switches 4 in sequence, and disconnect the adjacent second switches 5 in sequence, measure the voltages of the Nth battery and the N+1th battery, and calculate the voltage of the N+1th battery in a differential manner. At this time, after the overall measurement of the voltage A of the two individual batteries on the left, open the third first switch 4 on the left, close the fourth first switch 4 on the left, and disconnect the third second switch 5 on the left. At this time, the overall measurement of the voltage B of the three individual batteries on the left is performed, and the voltage value of the third individual battery is obtained by subtracting A from B.

[0053] In this embodiment, by deploying the monitoring circuit 2 and controlling the on-off of the switch thereon, diversified voltage detection of the battery can be achieved.

[0054] Embodiment 2. This embodiment is an improvement of the previous embodiment. It is a device for online monitoring of a battery pack, and also includes 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 to automatically control the opening and closing of the first switch 4 and the second switch 5 to achieve the purpose of automatic voltage detection of the battery.

[0055] As a preferred solution, in order to better manage the first switch 4 and the second switch 5, the switch control unit 6 includes a first switch integration module 12, a battery identification module 13 and a second switch integration module 14, and the first switch integration module 12 is used to sort and mark a plurality of first switches 4;

[0056] The second switch integration module 14 is used to sort and mark a plurality of second switches 5;

[0057] The first switch integration module 12 and the second switch integration module 14 are both connected to the battery identification module 13. The battery identification module 13 is used to sort and mark the multiple batteries constituting the battery group, establish a mapping relationship between the second switch 5 and the battery sorting mark, and establish a position correspondence between the multiple 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 to the monitoring unit 7, and the monitoring unit 7 includes an identification 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 to set a separate measurement mode and an overall measurement mode, wherein the separate measurement mode is used to close two adjacent first switches 4 corresponding to the battery sorting number according to the battery sorting number to be measured, and then disconnect the second switch 5 corresponding to the battery sorting number to be measured, and then close all the remaining second switches 5 to form a separate voltage measurement circuit for the battery to be measured, and monitor the voltage of the battery to be measured; the overall measurement mode is used to keep the first switch 4 set on the far left normally closed, and then open the adjacent first switches 4 in turn, and disconnect the adjacent second switches 5 in turn, measure the voltage of the Nth battery and the N+1th battery, and calculate the voltage of the N+1th battery in a differential manner;

[0059] The logic setting module 16 is connected to the logic storage module 24, and the logic storage module 24 is used to store the operation logic of the individual measurement mode and the overall measurement mode;

[0060] The identification recognition module 15 is connected to the logic storage module 24. The identification recognition module 15 is used to identify the battery ranking number that needs to be monitored, transmit the recognition result to the logic storage module 24, and find the operation logic of the battery voltage detection corresponding to the ranking number from the individual measurement mode and the overall measurement mode according to the recognition result;

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

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

[0063] The duration setting module 20 is connected to the mode switching module 21. The mode switching module 21 is used to monitor the voltage 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 operation duration. After the overall measurement mode reaches the set operation duration, the voltage of the battery pack according to the individual measurement mode is monitored as an output instruction to the single monitoring module 22;

[0064] The mode switching module 21 is connected to the single-cell monitoring module 22, and the single-cell monitoring module 22 is used to receive the output instruction and monitor the voltage of the battery pack according to the operation logic of the single measurement mode;

[0065] The mode switching module 21 is connected to the integrated monitoring module 23. The integrated monitoring module 23 is used to receive output instructions and monitor the voltage of the battery pack according to the operation logic of the overall measurement mode.

[0066] As a preferred solution, the monitoring switching unit 8 is connected to the data storage module 10, the data storage module 10 is used to store the actually measured voltage value, the data storage module 10 is connected to the data reference display module 11, the data reference display module 11 is used to set the voltage standard value as the alarm threshold, and compare the actually measured voltage value with the alarm threshold. When the alarm threshold is exceeded, an abnormal alarm is issued.

[0067] As a preferred solution, in order to ensure the accuracy of the voltage data collected in the overall measurement mode, the monitoring unit 7 is connected to the accumulation elimination unit 9, and the accumulation elimination unit 9 includes a single measurement recording module 18 and an accumulation error cleaning module 19. The single measurement recording module 18 is used to perform a separate voltage measurement on a separate battery in the battery pack according to the operation logic of the separate measurement mode, and record the corresponding voltage measurement result;

[0068] The single-cell measurement and recording module 18 is connected to the accumulated error cleaning module 19. The accumulated error cleaning module 19 is used to calculate the voltage of the individual batteries in the battery pack according to the operating logic of the overall measurement mode, and to calculate the difference between the voltage measurement results of the batteries with the same sorting number and the voltage measurement results recorded in the single-cell measurement and recording module 18 as the error value. When calculating the voltage of the individual batteries in the battery pack according to the operating logic of the overall measurement mode, the error value is subtracted to obtain the actual voltage value.

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

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

[0071] S1. Switch control: the first switch integration module 12 sorts and marks a plurality of first switches 4, the second switch integration 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 a mapping relationship between the second switches 5 and the battery sorting marks, and establishes a position correspondence relationship between the plurality of first switches 4 and the battery sorting marks;

[0072] S2, voltage monitoring: the logic setting module 16 sets the individual measurement mode and the overall measurement mode, and the operation logic of the individual measurement mode and the overall measurement mode is stored in the logic storage module 24. After the individual measurement mode reaches the operation time set by the time setting module 20, the mode switching module 21 monitors the voltage of the battery pack according to the overall measurement mode as an output instruction to the integrated monitoring module 23. 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 monitors the voltage of the battery pack according to the individual measurement mode as an output instruction to the single-cell monitoring module 22. The single-cell monitoring module 22 receives the output instruction and goes to S4.

[0074] S3, overall detection: the identification recognition module 15 identifies the battery ranking number to be monitored, and transmits the recognition result to the logic storage module 24. According to the recognition result, the operation logic of the battery voltage detection of the corresponding ranking number is found from the overall measurement mode. The switch on-off control module 17 keeps the first switch 4 set on the leftmost side normally closed, and then opens the adjacent first switch 4 in turn, and disconnects the adjacent second switch 5 in turn, and measures the voltage of the Nth battery and the N+1th battery, and calculates the voltage of the N+1th battery in a differential manner. Specifically, as shown in the attached figure, Figure 8 As shown, the boxes with positive and negative pole marks are individual batteries. At this time, after the overall measurement of the voltage A of the two individual batteries on the left, the third first switch 4 on the left is opened, the fourth first switch 4 on the left is closed, and the third second switch 5 on the left is disconnected. At this time, the overall measurement of the voltage B of the three individual batteries on the left is performed. After subtracting A from B, the voltage value of the third individual battery is obtained;

[0075] S4, separate detection: the identification recognition module 15 identifies the battery sorting number to be monitored, and transmits the recognition result to the logic storage module 24. According to the recognition result, the operation logic of the battery voltage detection corresponding to the sorting number is found from the separate measurement mode. The separate measurement mode is used for the switch on-off control module 17 to close the two adjacent first switches 4 corresponding to the battery sorting number according to the battery sorting number to be measured, and then 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 attached figure. Figure 7 As shown, the box with positive and negative pole marks is a separate battery. Disconnecting the second switch 5 corresponding to the sequence number of the battery to be measured is to disconnect the second switch 5 directly above the battery, and then close all the remaining second switches 5 to form a separate voltage measurement circuit for the battery to be measured, and monitor the voltage of the battery to be measured;

[0076] S5, cumulative error elimination: the single-cell measurement recording module 18 performs a single voltage measurement on a 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. The cumulative error cleaning 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 performs a difference calculation between the voltage measurement result of the battery with the same sorting number and the voltage measurement result recorded in the single-cell measurement recording module 18 as the error value. When calculating the voltage of the single battery in the battery pack according to the operation logic of the overall measurement mode, the error value is subtracted to obtain the actual voltage value.

[0077] S6: Comparative 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 the actual measured voltage value. The data reference display module 11 sets the voltage standard value as the alarm threshold. The actual measured voltage value is compared with the alarm threshold. When the alarm threshold is exceeded, an abnormal alarm is issued.

[0078] In summary, the present invention can realize automatic individual voltage detection of several batteries in a battery pack, and can also perform automatic overall voltage detection, which can effectively eliminate measurement errors and ensure the accuracy of voltage detection.

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

[0080] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention 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 to integrate a voltmeter (3), a plurality of first switches (4) and a plurality of second switches (5) for detecting the voltage of a plurality of storage battery packs, wherein the plurality of second switches (5) are arranged in series with the voltmeter (3), and two of the first switches (4) are respectively arranged on both sides of a single storage battery in the storage battery pack and are arranged in parallel with the second switches (5); The online monitoring platform (1) is used to control the opening and closing of the first switch (4) and the second switch (5), and to record the measurement results of the voltmeter (3).

2. The device for online monitoring of a battery pack according to claim 1, characterized in that: 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 to the monitoring unit (7), the monitoring unit (7) is connected to the monitoring switching unit (8), the monitoring switching unit (8) is connected to the data storage module (10), the data storage module (10) is connected to the data reference display module (11), and the monitoring unit (7) is connected to the accumulation elimination unit (9); The data storage module (10) is used to store the actually measured voltage value; The data reference display module (11) is used to set a voltage standard value as an alarm threshold, compare the actually measured voltage value with the alarm threshold, and issue an abnormal alarm when the voltage exceeds the alarm threshold.

3. The device for online monitoring of a battery pack according to claim 2, characterized in that: The switch control unit (6) comprises a first switch integrated module (12), a battery identification module (13) and a second switch integrated module (14); the first switch integrated module (12) and the second switch integrated module (14) are both connected to the battery identification module (13).

4. The device for online monitoring of a battery pack according to claim 3, characterized in that: The first switch integration module (12) is used to sort and mark a plurality of first switches (4); The second switch integrated module (14) is used to perform sequence marking on a plurality of second switches (5); The battery identification module (13) is used to sort and mark a plurality of batteries constituting a battery group, establish a mapping relationship between a second switch (5) and a battery sorting mark, and establish a position correspondence relationship between a plurality of first switches (4) and a battery sorting mark.

5. The device for online monitoring of a battery pack according to claim 4, characterized in that: 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 identification recognition module (15) and the logic setting module (16) are both connected to the logic storage module (24); and the logic storage module (24) is connected to the switch on / off control module (17).

6. The device for online monitoring of a battery pack according to claim 5, characterized in that: The logic setting module (16) is used to set a separate measurement mode and an overall measurement mode, wherein the separate measurement mode is used to close two adjacent first switches (4) corresponding to the battery sorting number according to the battery sorting number to be measured, then disconnect the second switch (5) corresponding to the battery sorting number to be measured, and then close all the remaining second switches (5) to form a separate voltage measurement circuit for the battery to be measured, and monitor the voltage of the battery to be measured; the overall measurement mode is used to keep the first switch (4) set on the leftmost side normally closed, then open the adjacent first switches (4) in sequence, and disconnect the adjacent second switches (5) in sequence, measure the voltage of the Nth battery and the N+1th battery, and calculate the voltage of the N+1th battery in a difference manner; The logic storage module (24) is used to store the operation logic of the individual measurement mode and the overall measurement mode; The identification recognition module (15) is used to recognize the ranking number of the storage battery to be monitored, transmit the recognition result to the logic storage module (24), and find the operation logic of the voltage detection of the storage battery with the corresponding ranking number from the individual measurement mode and the overall measurement mode according to the recognition result; The switch on-off control module (17) is used to control the on-off of the first switch (4) and the second switch (5) according to the operation logic.

7. The device for online monitoring of a battery pack according to claim 6, characterized in that: The accumulation elimination unit (9) comprises a single-unit measurement recording module (18) and an accumulation error cleaning module (19), and the single-unit measurement recording module (18) is connected to the accumulation error cleaning module (19); The single cell measurement recording module (18) is used to perform individual voltage measurements on individual batteries in the battery pack according to the operation logic of the individual measurement mode, and record the corresponding voltage measurement results; The accumulated error clearing module (19) is used to calculate the voltage of the individual batteries in the battery pack according to the operation logic of the overall measurement mode, calculate the difference between the voltage measurement results of the batteries with the same sorting number and the voltage measurement results recorded in the single-cell measurement recording module (18), and use the difference as the error value. When calculating the voltage of the individual batteries in the battery pack according to the operation logic of the overall measurement mode, the error value is subtracted to obtain the actual voltage value.

8. The device for online monitoring of a battery pack according to claim 7, characterized in that: The monitoring switching unit (8) comprises a duration setting module (20), a mode switching module (21), a single-unit monitoring module (22) and an integrated monitoring module (23); the duration setting module (20) is connected to the mode switching module (21); and the mode switching module (21) is connected to the single-unit monitoring module (22) and the integrated monitoring module (23) respectively.

9. The device for online monitoring of a battery pack according to claim 8, characterized in that: The duration setting module (20) is used to set the running duration of the individual measurement mode and the overall measurement mode; The mode switching module (21) is used to monitor the voltage of the battery pack according to the overall measurement mode and send it as an output instruction to the integrated monitoring module (23) after the individual measurement mode reaches a set operating time, and to monitor the voltage of the battery pack according to the individual measurement mode and send it as an output instruction to the single monitoring module (22) after the overall measurement mode reaches a set operating time; The single-cell monitoring module (22) is used to receive an output instruction and monitor the voltage of the battery pack according to the operation logic of the individual measurement mode; The integrated monitoring module (23) is used to receive output instructions and monitor the voltage of the battery pack according to the operating logic of the overall measurement mode.

10. A method for using a device for online monitoring of a battery pack, characterized in that: The specific steps include: S1. Circuit layout: first switches (4) are connected to both sides of individual batteries in the battery pack, and then two adjacent first switches (4) are connected in series using a second switch (5), and then the leftmost first switch (4) and the rightmost first switch (4) are connected in series with a voltmeter (3), so that a plurality of second switches (5) and voltmeters (3) are distributed in parallel; S2, switch control: the first switch integration module (12) performs sorting and marking on a plurality of first switches (4), the second switch integration module (14) performs sorting and marking on a plurality of second switches (5), the storage battery identification module (13) performs sorting and marking on a plurality of storage batteries constituting a storage battery group, establishes a mapping relationship between the second switches (5) and the storage battery sorting marks, and establishes a position correspondence relationship between the plurality of first switches (4) and the storage battery sorting marks; S3, voltage monitoring: the logic setting module (16) sets the individual measurement mode and the overall measurement mode, the operation logics of the individual measurement mode and the overall measurement mode are stored in the logic storage module (24), the mode switching module (21) is used to send the output instruction of voltage monitoring of the battery pack according to the overall measurement mode to the integrated monitoring module (23) after the individual measurement mode reaches the operation time set by the time setting module (20), the integrated monitoring module (23) receives the output instruction, and goes to S4 to monitor the voltage of the battery pack according to the operation logic of the overall measurement mode; After the overall measurement mode reaches a set running time, the mode switching module (21) monitors the voltage of the battery pack according to the individual measurement mode and sends it as an output instruction to the single-cell monitoring module (22). The single-cell monitoring module (22) receives the output instruction, switches to S5, and monitors the voltage of the battery pack according to the operating logic of the individual measurement mode. S4, overall detection: the identification module (15) identifies the ranking number of the storage battery to be monitored, and transmits the identification result to the logic storage module (24). According to the identification result, the operation logic of the voltage detection of the storage battery with the corresponding ranking number is found from the overall measurement mode. The switch on-off control module (17) keeps the first switch (4) arranged on the far left normally closed, then opens the adjacent first switches (4) in sequence, and disconnects the adjacent second switches (5) in sequence, measures the voltage of the Nth storage battery and the N+1th storage battery, and calculates the voltage of the N+1th storage battery in a differential manner; S5, separate detection: the identification recognition module (15) identifies the battery sorting number to be monitored, transmits the recognition result to the logic storage module (24), and searches the operation logic of the battery voltage detection corresponding to the sorting number from the separate measurement mode according to the recognition result. The separate measurement mode is used for closing two adjacent first switches (4) corresponding to the battery sorting number according to the battery sorting number to be measured, disconnecting the second switch (5) corresponding to the battery sorting number to be measured, and then closing all the remaining second switches (5), thereby forming a separate voltage measurement circuit of the battery to be measured, and monitoring the voltage of the battery to be measured; S6, cumulative error elimination: the single cell measurement recording module (18) performs a single voltage measurement on a single cell in the battery pack according to the operation logic of the single measurement mode in S5, and records the corresponding voltage measurement result; the cumulative error clearing module (19) performs voltage calculation on the single cell in the battery pack according to the operation logic of the overall measurement mode in S4, and calculates the difference between the voltage measurement result of the battery with the same sorting number and the voltage measurement result recorded in the single cell measurement recording module (18) as the error value; when calculating the voltage of the single cell in the battery pack according to the operation logic of the overall measurement mode, the error value is subtracted to obtain the actual voltage value; S7: Comparative display: The voltage detection result obtained in S5 and the actual voltage value collected in S6 are both stored in the data storage module (10) as the actual measured voltage value, and the data reference display module (11) sets the voltage standard value as the alarm threshold value, and compares the actual measured voltage value with the alarm threshold value. When the alarm threshold value is exceeded, an abnormal alarm is issued.

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