A device and method for monitoring the number and operating status of battery packs

Abstract

The present invention discloses a device for monitoring the number and operation status of batteries in a battery pack, comprising: a voltage acquisition unit for acquiring the positive terminal voltage U of each battery in the battery pack; N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1‑2 ; Operation and abnormality judgment unit, used to obtain the operating number and operating status of the batteries in the battery pack; output unit, used to transmit the results obtained by the operation and abnormality judgment unit to the system monitoring host. The battery pack battery number and operating status monitoring device provided by the present invention can obtain the voltage difference of each voltage detection terminal, and can judge the operating number and operating status of the batteries in the battery pack based on the acquired data, and transmit the results to the system monitoring host in time to facilitate timely adjustment of the terminal voltage. The present invention also discloses a battery pack battery number and operating status monitoring method applied to the above-mentioned battery pack battery number and operating status monitoring device.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically to a battery pack cell number and operating status monitoring device. In addition, the present invention also relates to a battery pack cell number and operating status monitoring method applied to the battery pack cell number and operating status monitoring device. Background Art

[0002] The existing battery inspection instrument in the DC system can only collect the real-time voltage of each battery, because the removed battery may have voltage or no voltage, and if the connection for battery voltage detection is not removed when the battery is removed, the terminal voltage of the battery can be collected normally at this time. Therefore, the existing battery inspection instrument can only detect whether the voltage of a single battery is low or high, but cannot determine whether the battery has been removed.

[0003] In summary, how to provide a device that can monitor the number and operating status of online batteries in a battery pack is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a device for monitoring the number and operating status of batteries in a battery pack, which can monitor the number and operating status of online operating batteries in the battery pack.

[0005] Another object of the present invention is to provide a method for monitoring the number and operating status of a battery pack applied to the above-mentioned device for monitoring the number and operating status of a battery pack.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A device for monitoring the number and operating status of batteries in a battery pack, comprising:

[0008] Voltage acquisition unit, used to obtain the positive terminal voltage U of each battery in the battery pack N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 ;

[0009] An operation and abnormality judgment unit, used for comparing and judging the data acquired by the voltage acquisition unit and a preset judgment program to obtain the number of operating batteries and operating status of the batteries in the battery pack;

[0010] An output unit, used for transmitting the results obtained by the operation and abnormality judgment unit to a system monitoring host;

[0011] The voltage acquisition unit is connected to the operation and abnormality determination unit, and the operation and abnormality determination unit is connected to the output unit.

[0012] Preferably, the voltage acquisition unit includes:

[0013] The battery pack terminal voltage acquisition module is used to obtain the terminal voltage U of the battery pack. 1-2 ;

[0014] The battery terminal voltage acquisition module is used to obtain the positive terminal voltage U of each battery. N1 And the negative terminal voltage U N2 ;

[0015] The battery terminal voltage acquisition module and the battery pack terminal voltage acquisition module are both connected to the operation and abnormality judgment unit.

[0016] Preferably, the battery pack terminal voltage acquisition module includes a first pin connected to one end of the battery pack and a second pin connected to the other end of the battery pack;

[0017] The first pin and the second pin are both connected to the operation and abnormality judgment unit.

[0018] Preferably, the battery terminal voltage acquisition module includes at least two third pins connected to the positive terminal of each of the batteries and at least two fourth pins connected to the negative terminal of each of the batteries; and the third pins are connected to the positive terminal of each of the batteries in a one-to-one correspondence, and the fourth pins are connected to the negative terminal of each of the batteries in a one-to-one correspondence;

[0019] The third pin and the fourth pin are both connected to the operation and abnormality judgment unit.

[0020] Preferably, the operation and abnormality judgment unit includes:

[0021] A battery connection determination module, used to detect and determine whether the connection between adjacent batteries is normal;

[0022] A voltage acquisition unit connection determination module, used to detect and determine whether the connection between the voltage acquisition unit 51 and the battery pack is normal;

[0023] A battery number determination module, used to detect and determine the number of online operating batteries of the battery pack;

[0024] The battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the voltage acquisition unit, and the battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the output unit.

[0025] A method for monitoring the number and operating status of a battery pack, applied to any of the above-mentioned devices for monitoring the number and operating status of a battery pack, comprising:

[0026] Get the positive terminal voltage U of each battery in the battery pack N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 ;

[0027] According to the positive terminal voltage U N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 and a pre-set judgment program to perform comparison and judgment to obtain the number and operating status of the batteries in the battery pack;

[0028] The judgment result is transmitted to the system monitoring host.

[0029] Preferably, the positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including:

[0030] Step S201: Determine U (N1-N2) =U (N-1)2-N2 =U N1-(N+1)1 =U en Is it true that the U en is the rated value of each of the batteries; if so, the Nth battery is connected normally, if not, proceed to step S202;

[0031] Step S202: Determine U (N1-N2) =U en ≠U N1-(N+1)1 Is it established? If so, the connection between the Nth battery and the N+1th battery is abnormal; if not, proceed to step S203;

[0032] Step S203: Determine U (N1-N2) =U en ≠U (N-1)2-N2 Is it true? If so, the connection between the Nth battery and the N-1th battery is abnormal.

[0033] Preferably, the positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including:

[0034] Step S211: Determine the terminal voltage U of the battery pack 1-2 , the voltage difference between the positive and negative terminals of the Nth battery is U N1-N2 , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the Nth battery U (N-1)2-N2 And the positive terminal voltage of the Nth battery and the positive terminal voltage of the N+1th battery U N1-(N+1)1 If U 1-2 =U, U N1-N2 ≤A, U (N-1)2-N2 ≤A, U N1-(N+1)1 =U en If both of the above conditions hold true, and A is a preset adjustable value, then the voltage acquisition unit is abnormally connected to the positive terminal of the Nth battery; if not, proceed to step S212;

[0035] Step S212: Determine U 1-2 =U, U N1-N2 ≤A, U N1-(N+1)1 ≤A, U (N-1)2-N2 =U en Are both true? If so, the connection between the voltage acquisition unit and the negative terminal of the Nth battery is abnormal.

[0036] Preferably, the positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including:

[0037] Determine the difference U between the positive terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery (N-1)1-(N+m)1 , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery (N-1)2-(N+m)2 , the difference between the negative positive terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery (N-1)1-(N+m)2 And the difference U between the negative terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery (N-1)2-(N+m)1 , where m is a positive integer greater than or equal to 1, and A is a preset adjustable value. (N-1)2-(N+m)1 ≤A, U (N-1)1-(N+m)1 =U en , U (N-1)2-(N+m)2 =U en ,I (N-1)1-(N+m)2 =2U en , are established at the same time, then the batteries from N to N+m-1 will be disconnected.

[0038] Preferably, after the Nth to N+m-1th batteries are disconnected, the following steps are performed:

[0039] The number of online battery operations of the battery pack is calculated.

[0040] The device for monitoring the number and operation status of a battery pack provided by the present invention comprises: a voltage acquisition unit: used to acquire the positive terminal voltage U of each battery in the battery pack; N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 ; Operation and abnormality judgment unit: used to compare and judge based on the data obtained by the voltage acquisition unit and the pre-set judgment program; Output unit: used to transmit the results obtained by the operation and abnormality judgment unit to the system monitoring host; The voltage acquisition unit is connected to the operation and abnormality judgment unit, and the operation and abnormality judgment unit is connected to the output unit.

[0041] In actual use, the battery pack battery number and operation status monitoring device provided by the present invention can monitor the terminal voltage U 1-2 , the positive terminal voltage U of each battery in the battery pack N1 And the negative terminal voltage U N2 The detection can be carried out, and a comparative judgment can be made based on the data obtained by the voltage acquisition unit and the pre-set judgment program to obtain the number and operating status of the batteries in the battery pack, and the results obtained by the operation and abnormality judgment unit are transmitted to the system monitoring host.

[0042] Compared with the prior art, the battery pack cell number and operating status monitoring device provided by the present invention can obtain the voltage difference of each voltage detection terminal, and can judge the operating number and operating status of the batteries in the battery pack based on the acquired data, and promptly transmit the results to the system monitoring host to facilitate timely adjustment of the terminal voltage.

[0043] In addition, the present invention also provides a method for monitoring the number of storage battery cells and operating status of a storage battery pack, which is applied to the above-mentioned device for monitoring the number of storage battery cells and operating status of the storage battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0045] Figure 1 This is a schematic diagram of the structure of the connection between the voltage acquisition unit provided by the present invention and the battery pack;

[0046] Figure 2A schematic diagram of the flow chart of the method for monitoring the number of cells and operating status of a battery pack provided by the present invention;

[0047] Figure 3 A schematic diagram of the connection between the battery pack battery number and operation status monitoring device and the pins provided by the present invention;

[0048] Figure 4 This is a schematic diagram of the structure of the device for monitoring the number of cells and operating status of a battery pack provided by the present invention.

[0049] Figure 1-Figure 4 middle:

[0050] 1 is the first pin, 2 is the second pin, 3 is the third pin, 4 is the fourth pin, 51 is the voltage acquisition unit, 52 is the operation and abnormality judgment unit, 53 is the control unit, 54 is the control and alarm communication output module, 541 is the battery pack operation status and battery quantity output module, 55 is the local alarm output module, 551 is the battery pack disconnection alarm unit, 552 is the battery pack battery quantity abnormality alarm unit, 553 is the battery pack monitoring device abnormality alarm unit, 554 is the battery pack monitoring device communication abnormality alarm unit, 56 is the battery pack monitoring device display module, 57 is the battery pack monitoring device power conversion module, and 6 is the working power input terminal. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0052] The core of the present invention is to provide a battery pack battery number and operating status monitoring device, which can monitor the operating number and operating status of batteries in a battery pack. Another core of the present invention is to provide a battery pack battery number and operating status monitoring method applied to the battery pack battery number and operating status monitoring device.

[0053] Please refer to Figure 1-4 , Figure 1 This is a schematic diagram of the structure of the connection between the voltage acquisition unit provided by the present invention and the battery pack; Figure 2 A schematic diagram of the flow chart of the method for monitoring the number of cells and operating status of a battery pack provided by the present invention; Figure 3 A schematic diagram of the connection between the battery pack battery number and operation status monitoring device and the pins provided by the present invention; Figure 4 This is a schematic diagram of the structure of the device for monitoring the number of cells and operating status of a battery pack provided by the present invention.

[0054] The battery pack battery number and operation status monitoring device provided in this specific embodiment includes: a voltage acquisition unit 51, which is used to obtain the positive terminal voltage U of each battery in the battery pack. N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 An operation and abnormality judgment unit 52 is used to compare and judge based on the data obtained by the voltage acquisition unit 51 and a preset judgment program to obtain the number of operating batteries and the operating status of the battery pack; an output unit is used to transmit the results obtained by the operation and abnormality judgment unit 52 to the system monitoring host; the voltage acquisition unit 51 is connected to the operation and abnormality judgment unit 52, and the operation and abnormality judgment unit 52 is connected to the output unit.

[0055] In actual use, the battery pack battery number and operation status monitoring device provided in this specific embodiment can monitor the terminal voltage U 1-2 , the positive terminal voltage U of each battery in the battery pack N1 And the negative terminal voltage U N2 Detection can be performed, and comparison and judgment can be performed based on the data obtained by the voltage acquisition unit 51 and the pre-set judgment program to obtain the number and operating status of the batteries in the battery pack, and the results obtained by the operation and abnormality judgment unit 52 are transmitted to the system monitoring host.

[0056] It needs to be explained that if Figure 1 As shown, the batteries in the battery pack mentioned in this application document are connected in series.

[0057] Compared with the existing technology, the voltage difference of each voltage detection terminal can be obtained, and the number and operating status of the batteries in the battery pack can be judged based on the acquired data, and the results can be promptly transmitted to the system monitoring host to facilitate timely adjustment of the terminal voltage.

[0058] Based on the above embodiment, the voltage acquisition unit 51 may include: a battery pack terminal voltage acquisition module, which is used to acquire the terminal voltage U 1-2 ; Battery terminal voltage acquisition module, used to obtain the positive terminal voltage U of each battery N1 And the negative terminal voltage U N2 The battery terminal voltage acquisition module and the battery pack terminal voltage acquisition module are both connected to the operation and abnormality judgment unit 52.

[0059] Preferably, the battery pack terminal voltage acquisition module includes a first pin 1 connected to one end of the battery pack and a second pin 2 connected to the other end of the battery pack; the first pin 1 and the second pin 2 are both connected to the operation and abnormality judgment unit 52.

[0060] During use, the first pin 1 and the second pin 2 will both transmit the detected voltage value to the operation and abnormality judgment unit 52, and the operation and abnormality judgment unit 52 calculates the voltage difference detected by the first pin 1 and the second pin 2 according to the acquired data, and can obtain the voltage value U of the battery pack. 1-2 .

[0061] Preferably, the battery terminal voltage acquisition module can include at least two third pins 3 connected to the positive terminal of each battery and at least two fourth pins 4 connected to the negative terminal of each battery; and the third pins 3 are connected to the positive terminal of each battery in a one-to-one correspondence, and the fourth pins 4 are connected to the negative terminal of each battery in a one-to-one correspondence; the third pins 3 and the fourth pins 4 are both connected to the operation and abnormality judgment unit 52.

[0062] like Figure 1 As shown, when the battery pack includes N batteries, where N is a positive integer greater than or equal to 1, there are N third pins 3, which are respectively connected to the positive end of each battery, and there are N fourth pins 4, which are respectively connected to the negative end of each battery. Preferably, the voltage measured by the third pin 3 of the first battery can be recorded as U 11 , the voltage measured at the fourth pin 4 of the first battery is recorded as U 12 , the voltage measured at the third pin 3 of the second battery is recorded as U 21 , the voltage measured at the fourth pin 4 of the second battery is recorded as U 22 , the voltage measured at the third pin 3 of the Nth battery is recorded as U N1 , the voltage measured at the fourth pin 4 of the Nth battery is recorded as U N2 .

[0063] Since each third pin 3 and each fourth pin 4 are connected to the operation and abnormality judgment unit 52, the operation and abnormality judgment unit 52 can calculate the voltage difference between each pin, for example, the difference between the positive terminal voltage of the first battery and the negative terminal voltage of the second battery is U 11-22 , the difference between the positive terminal voltage of the second battery and the positive terminal voltage of the fourth battery is U 21-41 , the difference between the negative terminal voltage of the N-1th battery and the positive terminal voltage of the N+2th battery is U (N-1)2-(N+2)1 The terminal voltage differences of other batteries are not described here.

[0064] On the basis of the above embodiments, the operation and abnormality judgment unit 52 can include: a battery connection judgment module: used to detect and judge whether the connection between adjacent batteries is normal; a voltage acquisition unit connection judgment module: used to detect and judge whether the connection between the voltage acquisition unit 51 and the battery pack is normal; a battery number judgment module: used to detect and judge the number of online operating batteries in the battery pack; the battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the voltage acquisition unit 51, and the battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the output unit.

[0065] During actual use, the battery connection judgment module can be used to detect the connection between each battery in the battery pack to determine whether there is a connection abnormality. When there is an abnormality, the output unit outputs the abnormal information to the system monitoring host; the voltage acquisition unit connection judgment module can determine whether the connection between the voltage acquisition unit 51 and each battery in the battery pack is normal based on the voltage data acquired by the voltage acquisition unit 51. The battery number judgment module can be used to detect the number of running batteries in the battery pack.

[0066] It should be noted that the battery connection determination module, the voltage acquisition unit connection determination module, and the battery number determination module can be integrated into the same integrated circuit.

[0067] In addition to the above-mentioned battery pack cell number and operating status monitoring device, the present invention also provides a battery pack cell number and operating status monitoring method applied to the battery pack cell number and operating status monitoring device disclosed in the above-mentioned embodiment, and the battery pack cell number and operating status monitoring method includes:

[0068] Step S1, obtaining the positive terminal voltage U of each battery in the battery pack N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 .

[0069] Step S2: According to the obtained positive terminal voltage U N1 , negative terminal voltage U N2 , terminal voltage U 1-2 And a pre-set judgment program is used to perform comparison and judgment to obtain the operating number and operating status of the batteries in the battery pack.

[0070] Step S3, transmitting the determination result to the system monitoring host.

[0071] It should be noted that the above step S2 is used to obtain the number of operating batteries and the operating status of the battery pack, including obtaining the number of operating batteries and the number of batteries that have exited operation in the battery pack, and judging whether the connection between each battery is normal and whether the connection between the voltage acquisition unit 51 and the battery pack is normal. Of course, other operating conditions can also be detected, which will be determined based on actual conditions and will not be elaborated here.

[0072] On the basis of the above embodiment, when the connection between the batteries in the battery pack is determined, the above step S2 includes:

[0073] Step S201: Determine U (N1-N2) =U (N-1)2-N2 =U N1-(N+1)1 =U en Is it established? en is the rated value of each battery; if so, the Nth battery is connected normally, if not, proceed to step S202.

[0074] Step S202: Determine U (N1-N2) =U en ≠U N1-(N+1)1 Is it established? If so, the connection between the Nth battery and the N+1th battery is abnormal. If not, proceed to step S203.

[0075] Step S203: Determine U (N1-N2) =U en ≠U (N-1)2-N2 Is it true? If so, the connection between the Nth battery and the N-1th battery is abnormal.

[0076] In the above steps, U (N1-N2) is the difference between the positive terminal voltage and the negative terminal voltage of the Nth battery, U (N-1)2-N2 is the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the Nth battery, U N1-(N+1)1 is the difference between the positive terminal voltage of the Nth battery and the positive terminal voltage of the N+1th battery. (N1-N2) =U (N-1)2-N2 =U N1-(N+1)1 =U en When the connection between the Nth battery and the N-1th battery and the N+1th battery is normal, (N1-N2) =U en ≠U N1-(N+1)1 , then the connection between the Nth battery and the N+1th battery is abnormal; if U (N1-N2) =U en ≠U (N-1)2-N2 , then the connection between the Nth battery and the N-1th battery is abnormal.

[0077] When it is necessary to detect the connection between the batteries in the entire battery pack, N can be set to 2, and the above step S201 is executed, and then N=N+1 is defined, and the process returns to step S201 until all batteries are detected.

[0078] It should be noted that during the detection process, a detection information may be transmitted to the output unit after each battery is detected, and then the output unit transmits the detection information to the system monitoring host. Alternatively, after all batteries have been detected, the overall detection structure may be transmitted to the output unit, and then the output unit outputs the overall detection result to the system monitoring host. The specific method of transmitting the detection results needs to be determined according to the actual situation and will not be elaborated here.

[0079] Based on the above embodiment, the connection between the voltage acquisition unit 51 and each battery in the battery pack may be detected, and the above step S2 includes:

[0080] Step S211: Determine the terminal voltage U of the battery pack 1-2 , the voltage difference between the positive and negative terminals of the Nth battery is U N1-N2 , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the Nth battery U (N-1)2-N2 And the positive terminal voltage of the Nth battery and the positive terminal voltage of the N+1th battery U N1-(N+1)1 If U 1-2 =U, U N1-N2 ≤A, U (N-1)2-N2 ≤A, U N1-(N+1)1＝ U en At the same time, if A is a preset adjustable value, the connection between the voltage acquisition unit 51 and the positive terminal of the Nth battery is abnormal. If not, the process proceeds to step S212.

[0081] Step S212: Determine U 1-2 =U, U N1-N2 ≤A, U N1-(N+1) 1≤A, U (N-1)2-N2 =U en Are both true? If so, the connection between the voltage acquisition unit 51 and the negative terminal of the Nth battery is abnormal.

[0082] It should be noted that when U 1-2 =U, U N1-N2 ≤A, U (N+1)2-N2 ≤A, U N1-(N+1)1 =U en Not satisfied with U 1-2 =U, U N1-N2 ≤A, U N1-(N+1)1 ≤A, U (N-1)2-N2 =U en When, and U(N1-N2) =U (N-1)2-N2 =U N1-(N+1)1 =U en , U 1-2 =U, the connection between the voltage acquisition unit 51 and the Nth battery is normal.

[0083] Where U is the rated value of the battery terminal voltage.

[0084] In the above steps, A is a preset adjustable value. In practice, A is a fixed value close to zero. The specific value of A needs to be determined according to the accuracy of the actual equipment. In the above step S211, N is a positive integer greater than or equal to 2.

[0085] In the process of detecting the connection between the voltage acquisition unit 51 and each battery in the battery pack, the connection between each battery and the voltage acquisition unit 51 can be detected, or the connection between a specific battery and the voltage acquisition unit 51 can be detected. The specific method is determined according to actual conditions and will not be elaborated here.

[0086] When it is necessary to detect the connection between each battery in the battery pack and the voltage acquisition unit 51, you can first define N=2 and execute the above step S11. After obtaining the test result, you can transmit the test result to the output unit and transmit it to the system monitoring host through the output unit. Of course, you can also record the test result and then define N=N+1, return to the previous step S211, until all batteries are tested, and then uniformly transmit the test results to the output unit. The specific output method of the test result can be determined according to the actual situation and will not be repeated here.

[0087] On the basis of the above embodiment, when it is necessary to detect the number of batteries in the battery pack, the above step S2 may include:

[0088] Step S221: Determine the difference U between the positive terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery (N-1)1-(N+m)1 , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery (N-1)2-(N+m)2 , the difference between the positive terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery (N-1)1-(N+m)2 And the difference U between the negative terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery (N-1)2-(N+m)1 , where m is a positive integer greater than or equal to 1, and A is a preset adjustable value. (N-1)2-(N+m)1 ≤A, U (N-1)1-(N+m)1 =U (N-1)2-(N+m)2 =U en , U (N-1)1-(N+m)2 =2U en, are established at the same time, then the batteries from N to N+m-1 will be disconnected.

[0089] In the above steps, when m is 1, if U (N-1)1-(N+1)1 =U en , U (N-1)2-(N+1)2 =U en , U (N-1)1-(N+1)2 =2U en At this time, the Nth battery exits. Using this judgment method, the value of N can be increased by 1 after each detection until all batteries are detected. When m is 2, U (N-1)1-(N+2)1 =U en , U (N-1)2-(+2)2 =U en , U (N-1)1-(N+2)2 =2U en At this time, the Nth battery and the N+1th battery are withdrawn. Using this method, the value of N can be increased by 2 after each detection until all batteries are detected; when m is 3, 4, 5 or other positive integers, the withdrawal status of other numbers of batteries can be detected.

[0090] After testing the number of cells exiting the battery pack, including:

[0091] Step S222: Calculate the number of online battery operations of the battery pack.

[0092] In the above step S222, the number of online batteries in the battery pack is: N-(N+m-1-N+1)=Nm.

[0093] It should be noted that after obtaining the number of batteries exiting the battery pack, the detection result can be transmitted to the output unit each time a battery is detected to be exiting, or the detection result can be output to the output unit after the entire battery pack is detected. The specific determination depends on the actual situation and will not be elaborated here.

[0094] like Figure 3As shown, in another specific embodiment, the pin is connected to the voltage acquisition unit 51, and the voltage acquisition unit 51 transmits the acquired voltage to the operation and abnormality judgment unit 52. The operation and abnormality judgment unit 52 can be a judge, including a first judge, a second judge and a third judge. The operation and abnormality judgment unit 52 transmits the judgment result to the control unit 53, and the control unit 53 outputs the information to the control and alarm communication output module 54 and the local alarm output module 55. The control and alarm communication output module 54 outputs the battery pack operation status and battery operation quantity to the DC system host through the battery pack operation status and battery quantity output module 541, and the local alarm output module 55 outputs the disconnection information to the battery pack disconnection alarm unit 551. Substation automation system, the local alarm output module 55 transmits the abnormal battery quantity information in the battery pack to the substation automation system through the battery pack battery quantity abnormal alarm unit 552, the local alarm output module 55 transmits the abnormal information of the monitoring device to the substation automation system through the battery pack monitoring device abnormal alarm unit 553, and the local alarm output module 55 transmits the abnormal communication information of the monitoring device to the substation automation system through the battery pack monitoring device communication abnormality alarm unit 554; the control unit 53 can also display the monitoring information of the monitoring device through the battery pack monitoring device display module 56, and control the power supply of the monitoring device through the battery pack monitoring device power conversion module 57 and the working power input terminal 6.

[0095] In addition, the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 mentioned in the present application document, the first, second, third and fourth in the first judgement, the second judgement and the third judgement are only for distinguishing the different positions and there is no order of precedence.

[0096] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0097] The above is a detailed introduction to the battery pack cell number and operating status monitoring device and method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for monitoring the number and operating status of a battery pack, applied to a device for monitoring the number and operating status of a battery pack, characterized in that: include: A voltage acquisition unit (51) is used to acquire the positive terminal voltage U of each battery in the battery pack. N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 ; An operation and abnormality judgment unit (52) is used to perform a comparison and judgment based on the data acquired by the voltage acquisition unit (51) and a pre-set judgment program, so as to obtain the number of operating batteries in the battery pack and the operating status; An output unit, used for transmitting the result obtained by the operation and abnormality judgment unit (52) to a system monitoring host; The voltage acquisition unit (51) is connected to the operation and abnormality judgment unit (52), and the operation and abnormality judgment unit (52) is connected to the output unit; Includes steps: Get the positive terminal voltage U of each battery in the battery pack N1 , negative terminal voltage U N2 And the terminal voltage U of the battery pack 1-2 ; According to the positive terminal voltage U N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 and a pre-set judgment program to perform comparison and judgment to obtain the number and operating status of the batteries in the battery pack; Transmit the judgment result to the system monitoring host; The positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including: Step S201, determine Is it true that the U en is the rated value of each of the batteries; if so, the Nth battery is connected normally, if not, proceed to step S202; Step S202, determine Is it established? If so, the connection between the Nth battery and the N+1th battery is abnormal; if not, proceed to step S203; Step S203, determine U （N1-N2） =U en ≠U （N-1）2-N2 Is it true? If so, the connection between the Nth battery and the N-1th battery is abnormal.

2. The method for monitoring the number and operating status of battery packs according to claim 1, characterized in that: The positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including: Step S211: Determine the terminal voltage U of the battery pack 1-2 , the voltage difference between the positive and negative terminals of the Nth battery , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the Nth battery And the positive terminal voltage of the Nth battery and the positive terminal voltage of the N+1th battery If the relationship between , , , If both of the above conditions are met, and A is a preset adjustable value, then the connection between the voltage acquisition unit (51) and the positive terminal of the Nth battery is abnormal; if not, proceed to step S212; Step S212: Determination , , , Whether both conditions are met at the same time, if so, the connection between the voltage acquisition unit (51) and the negative terminal of the Nth battery is abnormal.

3. The method for monitoring the number and operating status of battery packs according to claim 1, characterized in that: The positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 And the terminal voltage U 1-2 And pre-set judgment procedures for comparative judgment, including: Determine the difference between the positive terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery , the difference between the negative terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery , the difference between the positive terminal voltage of the N-1th battery and the negative terminal voltage of the N+mth battery And the difference between the negative terminal voltage of the N-1th battery and the positive terminal voltage of the N+mth battery The relationship between , where m is a positive integer greater than or equal to 1, A is a preset adjustable value, if , , are established at the same time, then the batteries from N to N+m-1 will be disconnected.

4. The method for monitoring the number and operating status of battery packs according to claim 3, characterized in that: After the Nth to N+m-1th batteries are disconnected, the following steps are included: The number of online battery operations of the battery pack is calculated.

5. The method for monitoring the number and operating status of battery packs according to claim 1, characterized in that: The voltage acquisition unit (51) comprises: The battery pack terminal voltage acquisition module is used to obtain the terminal voltage U of the battery pack. 1-2 ; The battery terminal voltage acquisition module is used to obtain the positive terminal voltage U of each battery. N1 And the negative terminal voltage U N2 ; The battery terminal voltage acquisition module and the battery pack terminal voltage acquisition module are both connected to the operation and abnormality judgment unit (52).

6. The method for monitoring the number and operating status of battery packs according to claim 5, characterized in that: The battery pack terminal voltage acquisition module comprises a first pin (1) connected to one end of the battery pack and a second pin (2) connected to the other end of the battery pack; The first pin (1) and the second pin (2) are both connected to the operation and abnormality judgment unit (52).

7. The method for monitoring the number and operating status of battery packs according to claim 5, characterized in that: The battery terminal voltage acquisition module comprises at least two third pins (3) connected to the positive terminal of each battery and at least two fourth pins (4) connected to the negative terminal of each battery; and the third pins (3) are connected to the positive terminal of each battery in a one-to-one correspondence, and the fourth pins (4) are connected to the negative terminal of each battery in a one-to-one correspondence; The third pin (3) and the fourth pin (4) are both connected to the operation and abnormality judgment unit (52).

8. The method for monitoring the number and operating status of battery packs according to claim 5, characterized in that: The operation and abnormality judgment unit (52) comprises: A battery connection determination module, used to detect and determine whether the connection between adjacent batteries is normal; A voltage acquisition unit connection determination module, used to detect and determine whether the connection between the voltage acquisition unit (51) and the battery pack is normal; A battery number determination module, used to detect and determine the number of online operating batteries of the battery pack; The battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the voltage acquisition unit (51), and the battery connection judgment module, the voltage acquisition unit connection judgment module, and the battery number judgment module are all connected to the output unit.

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