A battery pack detection and adjustment method and device

Abstract

The present invention discloses a battery pack detection and adjustment method, comprising: 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 ; The judgment program performs comparison and judgment to obtain the number of running batteries and the running status of the battery pack; judge whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status, or judge whether the running status needs to be adjusted according to the number of running batteries and the running status. The battery pack detection and adjustment method provided by the present invention can avoid the situation in the prior art that the number of running batteries in the battery pack and the setting value cannot be timely discovered. When the charging voltage needs to be changed, it can be discovered in time, thereby avoiding the batteries in the battery pack from being in an overcharged state for a long time. The present invention also discloses a battery pack detection and adjustment device for implementing the above-mentioned battery pack detection and adjustment method.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically, to a method for detecting and adjusting a battery pack. In addition, the present invention also relates to a battery pack detecting and adjusting device for implementing the above-mentioned method for detecting and adjusting a battery pack. Background Art

[0002] In the power system, power plants, substations and communication rooms all use DC systems to provide reliable working and power supply for relay protection devices, control circuits, monitoring equipment and communication equipment in the station. The DC system plays an important role in the safe and stable operation of power infrastructure. It is mainly composed of charging modules, battery packs, battery inspection instruments, DC busbars, monitors, ammeters, voltmeters, switching handles and feeder units. Among them, the charging module is the main power supply. During normal operation, it outputs a certain DC voltage to provide power for the DC load of the entire station. Its output parameters are monitored and controlled by the monitor. The staff can enter fixed value items in the monitor interface to control its output voltage and other parameters. As a backup power supply, the battery pack is connected to the charging module and DC load during normal operation. When the charging module fails, the battery provides DC power to ensure that the DC load of the entire station remains in normal operation for a certain period of time.

[0003] In actual operation, the monitor setting items are set by the setting personnel and executed by the maintenance personnel. The capacity verification or maintenance of the battery pack itself is often carried out by another professional staff. It is easy to fail to check the actual operating batteries and directly input the setting value set according to the rated number of batteries into the monitor for execution, or when the quality of individual batteries deteriorates and exits operation, the corresponding floating charge voltage and equalization charge voltage setting values ​​are not changed in time, resulting in the entire battery pack being in an overcharged state for a long time.

[0004] In summary, how to provide a battery pack detection and adjustment method to prevent the battery pack from being in an overcharged state for a long time is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a battery pack detection and adjustment method, which can prevent the batteries in the battery pack from being in an overcharged state for a long time.

[0006] Another object of the present invention is to provide a battery pack detection and adjustment device for implementing the above-mentioned battery pack detection and adjustment method.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A battery pack detection and adjustment method, comprising:

[0009] 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 ;

[0010] 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;

[0011] It is determined whether the charging voltage of the battery pack needs to be changed according to the number of batteries in operation and the operating status, or it is determined whether the operating status needs to be adjusted according to the number of batteries in operation and the operating status.

[0012] Preferably, judging whether the charging voltage of the battery pack needs to be changed according to the number and operating status of the batteries includes:

[0013] Determine whether the operating quantity of the battery matches the setting value of the charging module. If the judgment result is that it matches the setting value of the charging module, the judgment result is fed back to realize closed-loop control; if the judgment result is that it does not match the setting value of the charging module, the judgment result is transmitted to the substation automation system or the charging voltage required by the battery pack is calculated and the charging voltage is controlled to be changed.

[0014] Preferably, judging whether the operating state needs to be adjusted according to the operating number and operating state of the battery includes:

[0015] The information about abnormal operation status of the battery pack is transmitted to the substation automation system.

[0016] Preferably, after transmitting the judgment result to the substation automation system, the method further comprises:

[0017] Issue a warning message.

[0018] Preferably, the warning information is a whistle alarm or a light flashing alarm.

[0019] Preferably, the calculating the charging voltage required by the battery pack and controlling the change of the charging voltage comprises:

[0020] When in the equalization charging state, the required charging voltage is the rated equalization charging voltage*the number of batteries in operation;

[0021] When in the floating charge state, the required charging voltage is the rated floating charge voltage*the running number of the battery;

[0022] The charging voltage is controlled to be changed according to the required charging voltage.

[0023] Preferably, the positive terminal voltage U obtained according to N1 , the negative terminal voltage U N2 , the terminal voltage U1-2 and a preset judgment program are compared and judged to obtain the number and operating status of the batteries in the battery pack, including:

[0024] 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;

[0025] 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;

[0026] 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.

[0027] Preferably, the positive terminal voltage U obtained according to 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, including:

[0028] Step S211, determining 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;

[0029] 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.

[0030] Preferably, the positive terminal voltage U obtained according to 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, including:

[0031] 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 en , 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.

[0032] Preferably, after the Nth to N+m-1th batteries are disconnected, the following steps are performed:

[0033] The number of online battery operations of the battery pack is calculated.

[0034] A battery pack detection and adjustment device, used to implement the battery pack detection and adjustment method mentioned in any one of the above 0, comprising:

[0035] 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 ;

[0036] 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;

[0037] A system monitoring host, used to determine whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status of the batteries, or to determine whether the running status needs to be adjusted according to the number of running batteries and the running status of the batteries;

[0038] A charging module, used for controlling and changing the charging voltage of the battery pack;

[0039] The voltage acquisition unit is connected to the operation and abnormality judgment unit, the operation and abnormality judgment unit is connected to the system monitoring host, and the charging module is connected to the system monitoring host.

[0040] Preferably, the system monitoring host includes:

[0041] A battery running quantity judgment module is used to judge whether the running quantity of the battery matches the motor setting value;

[0042] An output module, used for transmitting the judgment result to the substation automation system;

[0043] A voltage calculation module, used for calculating the charging voltage required by the battery pack;

[0044] An output voltage control module, used to control the change of the charging voltage of the charging module;

[0045] The battery operation quantity judgment module is connected to the operation and abnormality judgment unit, the output module is connected to the battery operation quantity judgment module, the voltage calculation module is connected to the operation and abnormality judgment unit, and the output voltage control module is connected to the voltage calculation module and the charging module.

[0046] Preferably, it also includes:

[0047] The substation automation system is used to issue a warning message to prompt that the number of batteries in the battery pack does not match or the battery pack operates abnormally.

[0048] The battery pack detection and adjustment method provided by the present invention comprises: 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 ;According to the obtained positive terminal voltage U N1 , negative terminal voltage U N2 , terminal voltage U 1-2and a pre-set judgment program to compare and judge to obtain the number of running batteries and the running status of the batteries in the battery pack; judge whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status, or judge whether the running status needs to be adjusted according to the number of running batteries and the running status.

[0049] Compared with the prior art, the battery pack detection and adjustment method provided by the present invention can obtain the positive terminal voltage U N1 , negative terminal voltage U N2 , terminal voltage U 1-2 And a pre-set judgment program is used for comparison and judgment, and the operating number and operating status of the batteries in the battery pack are obtained, and then whether the charging voltage of the battery pack needs to be changed is judged according to the operating number and operating status of the batteries, or whether the operating status needs to be adjusted according to the operating number and operating status of the batteries. This can realize the judgment of whether the charging voltage needs to be changed, avoiding the situation in the prior art that the operating number of batteries in the battery pack does not match the set value. When the charging voltage needs to be changed, it can be discovered in time, thereby avoiding the batteries in the battery pack from being in an overcharged state for a long time.

[0050] In addition, the present invention also provides a battery pack detection and adjustment device for implementing the above-mentioned battery pack detection and adjustment method. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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.

[0052] 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;

[0053] Figure 2 A schematic flow chart of the battery pack detection and adjustment method provided by the present invention;

[0054] Figure 3 for Figure 2 A flowchart of a specific embodiment of a method for detecting and adjusting a battery pack;

[0055] Figure 4 A schematic diagram of the structure of a monitoring device in the battery pack detection and adjustment system provided by the present invention;

[0056] Figure 5 This is a schematic diagram of the structure of the battery pack detection and adjustment system provided by the present invention.

[0057] Figure 1-Figure 5 middle:

[0058] 1 is the first pin, 2 is the second pin, 3 is the third pin, 4 is the fourth pin, 5 is the monitoring device, 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, 6 is the DC system monitoring host, 7 is the charging module, and 8 is the working power input terminal. DETAILED DESCRIPTION

[0059] 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.

[0060] The core of the present invention is to provide a battery pack detection and adjustment method, which can detect and adjust the battery pack in time to prevent the batteries in the battery pack from being in an overcharged state for a long time. Another core of the present invention is to provide a battery pack detection and adjustment device for implementing the above-mentioned battery pack detection and adjustment method.

[0061] Please refer to Figure 1-5 , 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 flow chart of the battery pack detection and adjustment method provided by the present invention; Figure 3 for Figure 2 A flowchart of a specific embodiment of a method for detecting and adjusting a battery pack; Figure 4 A schematic diagram of the structure of a monitoring device in the battery pack detection and adjustment system provided by the present invention; Figure 5 This is a schematic diagram of the structure of the battery pack detection and adjustment system provided by the present invention.

[0062] The battery pack detection and adjustment method provided in this specific embodiment includes:

[0063] Step S1, obtaining the positive terminal voltage U of each battery in the battery pack N1 , negative terminal voltage U N2And the terminal voltage U of the battery pack 1-2 .

[0064] 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.

[0065] In the above step S2, the operating status of the batteries in the battery pack includes the connection status between the batteries in the battery pack and the connection status between the batteries in the battery pack and the device for detecting voltage.

[0066] Step S3, judging whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status, or judging whether the running status needs to be adjusted according to the number of running batteries and the running status.

[0067] In the above step S3, when it is detected that the number of running batteries in the battery pack is the same as the set value, there is no need to change the charging voltage of the battery pack. When it is detected that the number of running batteries in the battery pack is different from the set value, it is necessary to change the set voltage of the battery pack.

[0068] Compared with the prior art, the battery pack detection and adjustment method provided in this specific embodiment can be based on 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 for comparison and judgment, and the operating number and operating status of the batteries in the battery pack are obtained, and then whether the charging voltage of the battery pack needs to be changed is judged according to the operating number and operating status of the batteries, or whether the operating status needs to be adjusted according to the operating number and operating status of the batteries. This can realize the judgment of whether the charging voltage needs to be changed, avoiding the situation in the prior art that the operating number of batteries in the battery pack does not match the set value. When the charging voltage needs to be changed, it can be discovered in time, thereby avoiding the batteries in the battery pack from being in an overcharged state for a long time; and abnormal operation in the battery pack can be discovered in time and adjusted.

[0069] The above step S3 includes:

[0070] Step S31, determine whether the running number of the battery matches the setting value of the charging module 7. If the judgment result is that it matches the setting value of the charging module 7, the judgment result is fed back to realize closed-loop control; if the judgment result is that it does not match the setting value of the motor, the judgment result is transmitted to the substation automation system or the charging voltage required by the battery pack is calculated and the charging voltage is controlled to be changed.

[0071] In the above step S31, it is determined whether the number of running batteries matches the set value of the charging module 7. If the judgment result is that it matches the set value of the charging module 7, the judgment result is fed back to realize closed-loop control. If the judgment result is that it does not match the set value of the charging module 7, when it is manually adjusted, the judgment result can be transmitted to the substation automation system, and the substation automation system transmits the information to the dispatching automation system and the inspection center to make relevant prompts so that the staff can find out in time and change the charging voltage of the battery pack; when it is automatically adjusted, the charging voltage required by the battery pack is calculated and the charging voltage is controlled to be changed.

[0072] The above step S3 includes:

[0073] Step S32, transmitting the information of abnormal operation status in the battery pack to the substation automation system.

[0074] In the above step S32, when it is detected that there is an abnormality in the connection between the batteries in the battery pack or an abnormality in the connection between the battery pack and the voltage acquisition unit 51, it is necessary to transmit the information of the abnormal operation status to the substation automation system.

[0075] After the judgment results in the above steps S31 and S32 are transmitted to the substation automation system, the following steps are included:

[0076] Step S301, issuing a warning message.

[0077] In the above steps, when it is detected that the number of operating batteries in the battery pack does not match the set value, the judgment result is transmitted to the substation automation system and a warning message is issued; or when it is detected that the operating status of the batteries in the battery pack is abnormal, the detection result is transmitted to the substation automation system and a warning message is issued.

[0078] Preferably, the above-mentioned warning information can be a whistle alarm or a flashing light alarm; specifically, it can be a flashing alarm indicator light or a whistle alarm on the relevant equipment, and of course it can also be a warning message issued by the substation automation system. The specific details are determined according to the actual situation and will not be elaborated here.

[0079] The above step S31 includes:

[0080] Step S311, when in the equalization charging state, the required charging voltage is the rated equalization charging voltage*the number of running batteries;

[0081] When in float charge state, the required charging voltage is rated float charge voltage * battery operation quantity.

[0082] Step S312, controlling and changing the charging voltage according to the required charging voltage.

[0083] In the above steps, the rated equalization charge voltage is generally 2.25V, and the rated float charge voltage is generally 2.35V. Of course, when the battery model is changed, the rated equalization charge voltage and the rated float charge voltage may also be other values.

[0084] The above step S2 comprises:

[0085] 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.

[0086] 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.

[0087] 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.

[0088] In the above steps, U (N1-N2) is the difference between the negative terminal voltage and the positive 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.

[0089] 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.

[0090] It should be noted that during the detection process, each time a battery is detected, a detection information is transmitted to the output unit, 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 is 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.

[0091] 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:

[0092] 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, 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.

[0093] Step S212: Determine U 1-2 =U, U N1-N2 ≤A, U N1-(N+1)1 ≤A, U (N-1)2-N2 =U en If both of the above conditions are met, the connection between the voltage acquisition unit 51 and the negative terminal of the Nth battery is abnormal.

[0094] It should be noted that when U 1-2 =U, U N1-N2 ≤A, U (N-1）2-N2 ≤A, U N 1 -(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.

[0095] In the above step S212 and step S212, A is a pre-set adjustable value. In practice, A is a fixed value close to zero. The specific value of A needs to be determined based on the accuracy of the actual equipment. In the above step S211, N is a positive integer greater than or equal to 2.

[0096] 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.

[0097] 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.

[0098] 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:

[0099] 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 en , 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.

[0100] 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 =Uen , U (N-1)1-(N+1)2 =2U en At this time, the Nth battery is out of service. 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+m)1 =U en , U (N-1)2-(N+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.

[0101] After testing the number of cells exiting the battery pack, including:

[0102] Step S222, calculating the number of online battery operations of the battery pack.

[0103] In the above step S222, the number of online batteries in the battery pack is: N-(N+m-1-N+1)=Nm.

[0104] 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.

[0105] In addition to the above-mentioned battery pack detection and adjustment method, the present invention also provides a battery pack detection and adjustment device for implementing the battery pack detection and adjustment method disclosed in the above-mentioned embodiment, and the battery pack detection and adjustment device includes:

[0106] The 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 ;

[0107] The operation and abnormality judgment unit 52 is used to compare and judge according to the data obtained by the voltage acquisition unit 51 and the preset judgment program to obtain the number of operating batteries and the operating status of the batteries in the battery pack;

[0108] The system monitoring host is used to determine whether the data needs to be sent to the substation automation system based on the number and operating status of the batteries in operation;

[0109] Charging module 7, used to control and change the charging voltage of the battery pack;

[0110] The voltage acquisition unit 51 is connected to the operation and abnormality judgment unit 52, the operation and abnormality judgment unit 52 is connected to the system monitoring host, and the charging module 7 is connected to the system monitoring host.

[0111] During use, the voltage acquisition unit 51 and the operation and abnormality judgment unit 52 are generally referred to as a monitoring device 5 or a battery pack battery number and operation status monitoring device. The monitoring device 5 sends the acquired information on the number of online operating batteries and the operating status to the system monitoring host. Generally, the system monitoring host is a DC system monitoring host 6. The system monitoring host determines whether it is necessary to change the charging voltage of the battery pack according to the number of operating batteries and the operating status, or determines whether it is necessary to adjust the operating status according to the number of operating batteries and the operating status. When it is necessary to adjust the setting value of the charging module 7 of the battery pack, the charging voltage of the battery pack is adjusted through the charging module 7.

[0112] Based on the above embodiment, the system monitoring host includes:

[0113] The battery running quantity judgment module is used to judge whether the battery running quantity matches the motor setting value;

[0114] An output module is used to transmit the judgment result to the substation automation system;

[0115] A voltage calculation module, used to calculate the charging voltage required by the battery pack;

[0116] An output voltage control module, used to control the change of the charging voltage of the charging module 7;

[0117] The battery operation quantity judgment module is connected to the operation and abnormality judgment unit 52, the output module is connected to the battery operation quantity judgment module, the voltage calculation module is connected to the operation and abnormality judgment unit 52, and the output voltage control module is connected to the voltage calculation module and the charging module 7.

[0118] Based on the above embodiment, it may also include: a substation automation system, which is used to issue a warning message to prompt that the number of batteries in the battery pack does not match or the battery pack operates abnormally.

[0119] In another specific embodiment, the connection between the voltage acquisition unit 51 and the battery pack is as follows: Figure 1 As shown, the batteries in the battery pack mentioned in the present application document are connected in series, and the voltage acquisition unit 51 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 voltage difference between the first pin 1 and the second pin 2 is the terminal voltage U of the battery pack. 1-2, the first pin 1 and the second pin 2 are both connected to the operation and abnormality judgment unit 52; the voltage acquisition unit 51 is also provided with at least two third pins 3 connected to the negative end of each battery and at least two fourth pins 4 connected to the positive end of each battery; and the third pin 3 is connected to the negative end of each battery in a one-to-one correspondence, and the fourth pin 4 is connected to the positive end 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.

[0120] 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 .

[0121] 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 negative end of each battery, and there are N fourth pins 4, which are respectively connected to the positive 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 .

[0122] 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 negative terminal voltage of the first battery and the positive terminal voltage of the second battery is U 11-22 , the difference between the negative terminal voltage of the second battery and the negative terminal voltage of the fourth battery is U 21-41 , the difference between the positive terminal voltage of the N-1th battery and the negative 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.

[0123] In the process of testing and adjusting the battery pack, the voltage of the battery pack and each battery therein is measured through the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 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 pack1-2 The operation and abnormality judgment unit 52 compares and judges the data obtained by the voltage acquisition unit 51 and the pre-set judgment program to obtain the number of batteries in the battery pack and the operating status. When it is detected that the number of batteries in the battery pack matches the setting value of the charging module 7, the detection result is fed back to the operation and abnormality judgment unit 52 to achieve closed-loop control. When it is detected that the number of batteries in the battery pack does not match the setting value of the charging module 7, the detection result is sent to the substation automation system through the output module. When it is manually adjusted, the substation automation system transmits the information to the dispatching automation system and the inspection center. The dispatching automation system and the inspection center control the relevant equipment to issue warning information so as to promptly inform the relevant work. Personnel; when it is automatically adjusted, the system monitoring host can calculate the required charging voltage according to the received information, and can send the battery status to the operation and abnormality judgment unit 52, for example: "1" in the floating charge state, "2" in the equalization charge state, of course, it can also be other signal information, which is determined according to the actual situation, and the system monitoring host controls the charging module 7 to charge according to the calculated charging voltage; when it is detected that the operating status of the battery in the battery pack is abnormal, the information of the operating abnormality needs to be sent to the substation automation system, the substation automation system transmits the information to the dispatching automation system and the inspection center, the dispatching automation system and the inspection center control the relevant equipment to issue warning information, so as to inform the relevant work personnel in time.

[0124] like Figure 4As 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 substation through the battery pack disconnection alarm unit 551. The local alarm output module 55 transmits the abnormal information of the number of batteries in the battery pack to the substation automation system through the battery pack battery quantity abnormal alarm unit 552, and the local alarm output module 55 transmits the abnormal information of the monitoring device 5 to the substation automation system through the battery pack monitoring device abnormal alarm unit 553. The local alarm output module 55 transmits the abnormal information of the monitoring device 5 to the substation automation system through the battery pack monitoring device communication abnormal alarm unit 554; the control unit 53 can also display the monitoring information of the monitoring device 5 through the battery pack monitoring device display module 56, and control the power supply of the monitoring device 5 through the battery pack monitoring device power conversion module 57 and the working power input terminal 8.

[0125] like Figure 5 As shown, the battery pack detection and adjustment system includes a monitoring device 5, a DC system monitoring host 6, a charging module 7, a pin connected to the monitoring device 5, and a substation automation system connected to the DC system monitoring host 6. The monitoring device 5 calculates and determines the operating status of the battery pack and the number of batteries in operation through the voltage obtained by the pin, and transmits this information to the DC system monitoring host 6. The DC system monitoring host 6 can control the charging voltage of the battery pack through the charging module 7, and can also send information to the substation automation system so that the staff can obtain the operating data of the battery pack in time. The DC system monitoring host 6 can also send the charging status of the battery pack to the monitoring device 5, whether it is floating charge or equalized charge.

[0126] It should be noted that the first, second, third and fourth among the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 mentioned in the present application document are only for distinguishing the different positions and there is no order of precedence.

[0127] 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.

[0128] The above is a detailed introduction to the battery pack detection and adjustment method and device 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 battery pack detection and adjustment method, characterized in that: include: 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 of operating batteries in the battery pack and the operating status of the batteries in the battery pack, wherein the operating status of the batteries in the battery pack includes the mutual connection between the batteries in the battery pack and the connection between the batteries in the battery pack and the device for detecting voltage; Determining whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status, or determining whether the running status needs to be adjusted according to the number of running batteries and the running status; The positive terminal voltage U obtained according to 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, including: 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 connection is normal, if not, proceed to step S202, wherein U (N1-N2) is the difference between the negative terminal voltage and the positive 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; 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; 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; Step S211, determining 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 (51) is abnormally connected to the positive terminal of the Nth battery; if not, proceed to step S212; 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 conditions established at the same time? If so, the connection between the voltage acquisition unit (51) and the negative terminal of the Nth battery is abnormal.

2. The battery pack detection and adjustment method according to claim 1, characterized in that: The determining whether the charging voltage of the battery pack needs to be changed according to the number and operating status of the batteries includes: It is determined whether the operating quantity of the battery matches the set value of the charging module (7); if the determination result is that it matches the set value of the charging module (7), the determination result is fed back to realize closed-loop control; if the determination result is that it does not match the set value of the charging module (7), the determination result is transmitted to the substation automation system or the charging voltage required by the battery pack is calculated and the charging voltage is controlled to be changed.

3. The battery pack detection and adjustment method according to claim 1, characterized in that: The determining whether the operating state needs to be adjusted according to the operating number and operating state of the battery includes: The information about abnormal operation status of the battery pack is transmitted to the substation automation system.

4. The battery pack detection and adjustment method according to claim 2 or 3, characterized in that: After the determination result is transmitted to the substation automation system, the method further comprises: Issue a warning message.

5. The battery pack detection and adjustment method according to claim 4, characterized in that: The warning information is a whistle alarm or a light flashing alarm.

6. The battery pack detection and adjustment method according to claim 2, characterized in that: The step of calculating the charging voltage required by the battery pack and controlling the change of the charging voltage comprises: When in the equalization charging state, the required charging voltage is the rated equalization charging voltage*the number of batteries in operation; When in the floating charge state, the required charging voltage is the rated floating charge voltage*the operating number of the battery; The charging voltage is controlled to be changed according to the required charging voltage.

7. The battery pack detection and adjustment method 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 a pre-set judgment program to perform comparison and judgment to obtain the number and operating status of the batteries in the battery pack, including: 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 en , 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.

8. The battery pack detection and adjustment method according to claim 7, 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.

9. A battery pack detection and adjustment device, used to implement the battery pack detection and adjustment method mentioned in any one of claims 1 to 8, 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 preset judgment program to obtain the number of operating batteries in the battery pack and the operating status; A system monitoring host, used to determine whether the charging voltage of the battery pack needs to be changed according to the number of running batteries and the running status of the batteries, or to determine whether the running status needs to be adjusted according to the number of running batteries and the running status of the batteries; A charging module (7), used for controlling and changing the charging voltage of the battery pack; The voltage acquisition unit (51) is connected to the operation and abnormality judgment unit (52), the operation and abnormality judgment unit (52) is connected to the system monitoring host, and the charging module (7) is connected to the system monitoring host.

10. The battery pack detection and adjustment device according to claim 9, characterized in that: The system monitoring host comprises: A battery running quantity judgment module is used to judge whether the running quantity of the battery matches the motor setting value; An output module, used for transmitting the judgment result to a substation automation system; A voltage calculation module, used for calculating the charging voltage required by the battery pack; An output voltage control module, used for controlling the change of the charging voltage of the charging module (7); The battery operation quantity judgment module is connected to the operation and abnormality judgment unit (52), the output module is connected to the battery operation quantity judgment module, the voltage calculation module is connected to the operation and abnormality judgment unit (52), and the output voltage control module is connected to the voltage calculation module and the charging module (7).

11. The battery pack detection and adjustment device according to claim 10, characterized in that: Also includes: The substation automation system is used to issue a warning message to prompt that the number of batteries in the battery pack does not match or the battery pack operates abnormally.

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