Wiring harness detection method, device and equipment of battery pack and medium

Abstract

The invention discloses a wire harness detection method, device and equipment for a battery pack and a medium, and relates to the technical field of new energy, and the method comprises the steps: determining the number of collection wires and the connection relation between the collection wires and the battery units according to the number of the battery units contained in the battery pack and the connection rule of the battery units; determining a line sequence detection sequence among all the battery units in the battery pack according to the connection relation and the connection rule; performing wire sequence detection on the wire harnesses in sequence according to the wire sequence detection sequence, and obtaining a wire sequence detection result according to the connection relationship; and according to the line sequence detection result, the corresponding acquisition line is overhauled, and the battery pack is connected to the battery management unit after the overhaul is completed. According to the invention, line sequence error detection caused by disconnection and over-voltage and under-voltage can be avoided, and the safety of battery pack assembly of the energy storage battery system is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy technologies, and in particular to a method, device, equipment and medium for detecting a wiring harness of a battery pack. Background Art

[0002] In new energy technologies, large energy storage battery systems usually have many battery packs (battery packs). Battery packs refer to multiple battery cells connected in series and parallel, packaged, encapsulated and assembled according to the shape required by the customer. Batteries that are not assembled and can be used directly are called battery cells, while finished batteries that are connected to protection circuit modules and have functions such as charge and discharge control are called battery packs. Battery packs contain not only individual battery units, but also a variety of other supporting equipment.

[0003] At present, each battery pack is connected to a battery management unit (BMU) to collect relevant data such as battery voltage and temperature in real time, and exchange data with the main control unit. However, when assembling the battery pack, the voltage collection harness sequence is often disordered, resulting in the burning of the BMU device after connecting to the BMU. In serious cases, it may even cause a fire, resulting in unpredictable losses, and bringing inevitable troubles and economic losses to the assembly and testing of the battery pack.

[0004] Therefore, the battery pack assembly process requires a method that can accurately detect the disordered line sequence. Summary of the invention

[0005] In view of this, embodiments of the present invention provide a wire harness detection method, device, equipment and medium for a battery pack, so as to solve the problem of disordered acquisition line sequence during battery Paak assembly.

[0006] According to a first aspect, an embodiment of the present invention provides a wiring harness detection method for a battery pack, the method comprising: Determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; Determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and connection rules; The wiring harness is sequentially tested in line sequence according to the line sequence test sequence, and the line sequence test result is obtained according to the connection relationship; the line sequence test result is used for the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence test includes the line drop test, the positive and negative value test and the over-voltage and under-voltage test performed in sequence; According to the line sequence detection results, the corresponding acquisition lines are repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

[0007] In combination with the first aspect, in a first implementation of the first aspect, performing line sequence detection on the wire harness in sequence according to the line sequence detection order, and obtaining the line sequence detection result according to the connection relationship, specifically includes: Performing a line drop detection on each wire harness in turn according to the line sequence detection order to obtain a first detection result; When it is determined that the first detection result is a normal connection, a positive and negative value detection is performed on the normally connected acquisition line to obtain a second detection result; When it is determined that the second detection result is a normal connection, an overvoltage or undervoltage detection is performed on the normally connected acquisition line to obtain a third detection result.

[0008] In combination with the first implementation of the first aspect, in the second implementation of the first aspect, performing offline detection on each acquisition line in sequence according to the line sequence detection order to obtain the first detection result specifically includes: Connect all voltage acquisition interfaces of the battery pack to be tested; According to the line sequence detection order and the number of acquisition lines, each acquisition line is sequentially detected for disconnection to obtain a first detection result.

[0009] In combination with the second implementation of the first aspect, in the third implementation of the first aspect, when determining that the first detection result is a normal connection, performing positive and negative value detection on the normally connected acquisition line to obtain the second detection result specifically includes: When it is determined that the first detection result is a normal connection, the preset positive and negative values ​​of each acquisition line are determined according to the connection relationship; A positive and negative value detection is performed on the normally connected acquisition line according to the preset positive and negative values ​​to obtain a second detection result.

[0010] In combination with the third implementation manner of the first aspect, in the fourth implementation manner of the first aspect, when determining that the second detection result is a normal connection, performing over-voltage and under-voltage detection on the normally connected acquisition line to obtain a third detection result specifically includes: When it is determined that the second detection result is a normal connection, determining a preset operating voltage of each battery unit; An over-voltage or under-voltage detection is performed on the normally connected acquisition line according to the connection relationship and the preset working voltage to obtain a third detection result.

[0011] In combination with the first aspect, in a fifth implementation of the first aspect, determining the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells specifically includes: Determine a first number of battery cells included in the battery pack to be detected, and obtain a connection rule between the battery cells; Detecting the integrity of each battery cell, and determining the second number of acquisition lines according to the number of battery cells and connection rules when it is determined that the battery cells are all intact; The connection relationship between the acquisition line and the battery cell is determined according to the first number of the battery cells and the second number of the battery cells, and the connection relationship is verified using the connection rule, the first number and the second number.

[0012] In combination with the first aspect, in a sixth implementation of the first aspect, determining the line sequence detection order between all battery cells in the battery pack according to the connection relationship and the connection rule specifically includes: Determine the connection path of the battery pack to be tested according to the connection rule and the connection relationship; A wiring harness having a negative voltage value in each connection path is determined according to the connection relationship, and a line sequence detection order between all battery cells in the battery pack is determined according to the connection path and the wiring harness having a negative voltage value.

[0013] According to a second aspect, an embodiment of the present invention further provides a wiring harness detection device for a battery pack, the device comprising: A connection determination module, used to determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; A sequence determination module, used to determine the line sequence detection sequence between all battery cells in the battery pack according to the connection relationship and connection rules; A line sequence detection module is used to perform line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtain the line sequence detection result according to the connection relationship; the line sequence detection result is used to identify the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence; The battery connection module is used to repair the corresponding acquisition line according to the line sequence detection results, and connect the battery pack to the battery management unit after the repair is completed.

[0014] According to a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the wiring harness detection method for a battery pack as described in any one of the above are implemented.

[0015] According to a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described battery pack wiring harness detection methods.

[0016] The wiring harness detection method, device, equipment and medium of the battery pack of the present invention determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells contained in the battery pack and the connection rules of the battery cells, and then determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and the connection rules, and then perform line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtain the line sequence detection result according to the connection relationship. At the same time, the line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence, which can find out which one or which wire harnesses in the battery pack have a fault. After the wiring harness problem is solved, the line sequence detection system or equipment is connected again. Therefore, it can be used to quickly eliminate the line sequence problem in the battery pack assembly, and can accurately detect the faults such as line drop, over-voltage and under-voltage and wiring sequence errors in a single battery cell, which can avoid the line sequence misdetection caused by line drop and over-voltage and under-voltage, and further improve the safety of battery pack assembly of the energy storage battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings: Figure 1 A schematic diagram showing a flow chart of a wiring harness detection method for a battery pack provided by the present invention; Figure 2 A schematic diagram of detecting a disconnection situation of an analog acquisition line in the prior art is shown; Figure 3 A schematic diagram of detecting a first case of simulating disconnection of an acquisition line in a wiring harness detection method for a battery pack provided by the present invention is shown; Figure 4 The following is a schematic diagram showing a detection of a second analog acquisition line disconnection situation in the prior art; Figure 5 A schematic diagram of detecting a second case of simulating disconnection of an acquisition line in the wiring harness detection method for a battery pack provided by the present invention is shown; Figure 6 A schematic diagram of detecting the crossing of simulated acquisition lines in the prior art is shown; Figure 7 A schematic diagram of detecting the crossover of simulated acquisition lines in the wire harness detection method for a battery pack provided by the present invention is shown; Figure 8 A schematic diagram of the circuit structure of a circuit used in a wiring harness detection method for a battery pack provided by the present invention is shown; Fig. 9 A schematic structural diagram of a wiring harness detection device for a battery pack provided by the present invention is shown; Fig.10 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] Large energy storage battery systems usually have many battery packs (battery packs). Battery packs refer to multiple battery cells connected in series and parallel, packaged, encapsulated and assembled according to the shape required by the customer. Batteries that are not assembled and can be used directly are called battery cells, while finished batteries that are connected to protection circuit modules and have functions such as charge and discharge control are called battery packs. Battery packs contain not only individual battery units, but also a variety of other supporting equipment.

[0020] For example, an electric vehicle power battery pack usually includes: Power battery module: The power battery module is the core part of the battery pack, responsible for storing and releasing energy to provide driving force for the car; Structural module: This part is usually responsible for protecting the battery and carrying and fixing the entire battery pack; Thermal management module: This part is used to regulate the temperature of the entire battery pack to prevent overheating and cool the battery, thereby extending the battery life and avoiding danger; Battery Management System (BMS): This part is responsible for detecting and controlling various parameters of the battery, such as power, voltage, current, temperature, etc., to ensure the safety and effective operation of the battery.

[0021] At present, each battery pack is connected to a set of BMU to collect relevant data such as battery voltage and temperature in real time, and exchange data with the main control unit. However, when assembling the battery pack, the voltage collection harness sequence is often disordered, which will cause the BMU device to burn after connecting to it. In serious cases, it may even cause a fire, resulting in unpredictable losses, and bringing inevitable troubles and economic losses to the assembly and testing of the battery pack.

[0022] In view of the above problems, a method is needed in the battery pack assembly process to accurately detect disordered line sequences.

[0023] In order to solve the above problems, a battery pack wiring harness detection method is provided in this embodiment, which aims to detect the wiring harness of the battery pack before the battery pack is connected to the BMU, obtain more accurate wiring harness detection results, and improve the safety of battery pack assembly of the energy storage battery system. The battery pack wiring harness detection method of the embodiment of the present invention can be used in electronic devices, including but not limited to computers, mobile terminals, etc. Figure 1 is a flow chart of a wiring harness detection method for a battery pack according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps: S10, determining the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells.

[0024] Since the battery pack contains several battery cells, each of which contains a battery cell, the battery pack is used to divide the battery cells used for energy storage into many battery modules according to a specific rule, which are used to store electric energy and facilitate real-time monitoring, maintenance and management. In actual production, each battery cell needs to lead out a collection line from its positive and negative poles respectively, that is, one battery cell needs to lead out two collection lines. When these battery cells are connected in series and parallel to form a battery pack, a certain battery cell will share a collection line with its adjacent battery cell. The specific collection line shared is determined by the connection relationship between the positive and negative poles of the battery cell. Therefore, the battery pack has a total of N+1 collection lines, where N represents the number of battery cells in the battery pack.

[0025] S20, determining a line sequence detection order between all battery cells in the battery pack according to the connection relationship and the connection rule.

[0026] After the connection relationship between the acquisition line and the battery unit is determined, a line sequence detection order that can correctly obtain the wire harness detection result can be obtained according to the connection relationship.

[0027] Take the battery pack consisting of 13 battery cells and the cells of these battery cells are connected in series as an example. In this way, there are 14 acquisition lines in total for the battery pack. The positive electrode of the first cell corresponding to the first battery cell and the negative electrode of the second cell corresponding to the second battery cell share a acquisition line. The positive electrode of the second cell corresponding to the second battery cell and the negative electrode of the third cell corresponding to the third battery cell share a acquisition line, and so on. In this embodiment, in order to better identify which battery cell has a problem with the wiring harness, a wiring harness with a negative voltage value drawn from the negative electrode is detected, so that the corresponding line sequence detection order is the wiring harness of the first cell negative electrode corresponding to the first battery cell → the positive electrode of the first cell corresponding to the first battery cell and the negative electrode of the second cell corresponding to the second battery cell share a acquisition line → the positive electrode of the second cell corresponding to the second battery cell and the negative electrode of the third cell corresponding to the third battery cell share a acquisition line, until the last wiring harness is detected.

[0028] S30. Perform line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtain the line sequence detection result according to the connection relationship. In this embodiment, the line sequence detection result is used for the faulty acquisition line, the corresponding faulty battery unit and the cause of the fault. The line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence.

[0029] Preferably, the line sequence detection results can be intuitively displayed through corresponding indicator lights. For example, the battery cells indicated in the line sequence detection results as being normally connected to the acquisition line are prominently prompted by lighting up the indicator lights, while the battery cells and / or acquisition lines indicated in the line sequence detection results as having failed acquisition lines. Of course, the cause of the failure can be displayed through other signal display methods.

[0030] S40: According to the line sequence detection result, the corresponding acquisition line is repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

[0031] Although the existing battery pack line sequence detection method can detect some line sequence problems, there are still some detection blind spots: 1. It cannot detect the disconnection error, that is, the sampling line is not properly connected to the battery cell, but the detection result still indicates that the wiring is normal; 2. It cannot detect over-voltage and under-voltage errors. Taking lithium iron phosphate as an example, the battery voltage exceeds 4V or even higher, and it still indicates that the wiring is normal. In the above situation, connecting the BMU device will also burn the BMU device, and even cause a fire, posing a safety hazard.

[0032] Different from the prior art, in this embodiment, by performing offline detection, positive and negative value detection, and over- and under-voltage detection in sequence, the final line sequence detection result is more accurate and the classification of the fault cause is more accurate. At the same time, based on the connection relationship obtained previously, the line sequence detection result also includes the corresponding faulty battery unit.

[0033] In this way, before connecting the battery pack to the BMU, it is first connected to the wire sequence detection system or device using this method, and the corresponding method can be used to find out which wire harness or wires in the battery pack are faulty. After the wire harness problem is solved, the wire sequence detection system or device is connected again. If no wire harness problem is found at this time, it will be very safe for the battery pack to connect to the BMU again.

[0034] The wiring harness detection method for a battery pack of the present invention determines the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells, and then determines the line sequence detection order between all the battery cells in the battery pack according to the connection relationship and the connection rules, and then performs line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtains the line sequence detection result according to the connection relationship. At the same time, the line sequence detection includes line drop detection, positive and negative value detection, and over- and under-voltage detection performed in sequence, which can find out which one or several wiring harnesses in the battery pack have a fault. After the wiring harness problem is solved, the line sequence detection system or device is connected again. Therefore, it can be used to quickly eliminate the line sequence problem in the battery pack assembly, and can accurately detect the line drop, over- and under-voltage, and wiring sequence errors in a single battery cell, which can avoid the line sequence misdetection caused by line drop and over- and under-voltage, and further improve the safety of the battery pack assembly of the energy storage battery system.

[0035] Wherein, step S10 specifically includes: S11, determining a first number of battery cells included in the battery pack to be detected, and obtaining a connection rule between the battery cells. It should be noted that the connection rule between the battery cells can be determined according to factory requirements.

[0036] S12. Detect the integrity of each battery cell, and when it is determined that the battery cells are intact, determine the second number of acquisition lines according to the number of battery cells and the connection rules. It can be understood that the second number is the number of acquisition lines that the battery pack to be detected should have under theoretical circumstances, and the corresponding offline detection can be performed subsequently based on this number.

[0037] S13, determining a connection relationship between the acquisition line and the battery cell according to the first number of the battery cells and the second number of the battery cells, and verifying the connection relationship by using the connection rule, the first number and the second number.

[0038] Since the connection rule is fixed, the rationality of the connection relationship can be reversely verified based on the determined first and second quantities.

[0039] Accordingly, step S20 specifically includes: S21, determining the connection path of the battery pack to be detected according to the connection rule and the connection relationship. Take the battery pack consisting of 13 battery cells and the cells of these battery cells are connected in series as an example, in which case there is only one connection path.

[0040] S22, determining the wiring harness with a negative voltage value in each connection path according to the connection relationship, and determining the line sequence detection order between all battery cells in the battery pack according to the connection path and the wiring harness with a negative voltage value.

[0041] Since the connection relationship includes the common relationship of the wiring harnesses between the battery cells, the wiring harness with a negative voltage value in each connection path can be determined according to the connection relationship. In particular, when the battery pack has at least two connection paths, the wiring harness detection can be performed in parallel, or in a corresponding order according to the length of the connection path.

[0042] Wherein, step S30 specifically includes: S31, perform disconnection detection on each wiring harness in sequence according to the line sequence detection order to obtain a first detection result. Before performing the disconnection detection in the line sequence detection, first connect all voltage acquisition interfaces of the battery pack to be detected, and then perform disconnection detection on each acquisition line in sequence according to the line sequence detection order and the number of acquisition lines to obtain a first detection result, which includes battery cells that are not correctly connected to the acquisition line and battery cells that are normally connected to the acquisition line.

[0043] For example, a battery pack is composed of 13 battery cells, and the cells of these battery cells are connected in series. Figure 2 and Figure 3 , simulating the situation where all acquisition lines except B1- and B13+ are disconnected. There are three results obtained by detection in the prior art: 1. All 13 indicator lights are on, indicating that all acquisition lines of the battery unit are fine; 2. The odd-numbered indicator lights are on, indicating that the odd-numbered battery wiring is fine, and the even-numbered battery wiring is problematic; 3. The even-numbered indicator lights are on, indicating that the even-numbered battery wiring is fine, and the odd-numbered battery wiring is problematic. Obviously, these three situations in the prior art are all wrong. In this embodiment, all 13 indicator lights are off, which can correctly indicate that all battery units have acquisition line disconnection failures, which is consistent with the actual simulation situation.

[0044] See also Figure 4 and Figure 5, simulating the situation that the B4+ acquisition line is disconnected, that is, one of the acquisition lines of the battery pack is not properly connected to the corresponding battery unit. The results obtained by the detection in the prior art also have three situations: 1. All 13 indicator lights are on, which indicates that all the acquisition lines of the battery unit are fine; 2. The No. 4 indicator light is not on, and the others are all on, which indicates that there is a problem with the connection of the fourth battery cell of the fourth battery unit. However, due to the common relationship of the acquisition lines, there is actually a problem with the connection of the fifth battery cell of the fifth battery unit; 3. The No. 5 indicator light is not on, and the others are all on, which indicates that there is a problem with the connection of the fifth battery cell of the fifth battery unit. However, due to the common relationship of the acquisition lines, there is actually a problem with the connection of the fourth battery cell of the fourth battery unit. At this time, the battery pack will directly connect to the slave control, and the slave control will show that the voltage acquisition values ​​of the No. 4 battery and the No. 5 battery must be incorrect. At this time, it is very likely that a new slave control will be replaced for verification. The result still shows that the voltage acquisition values ​​of the No. 4 battery and the No. 5 battery are still incorrect. Only then will it be confirmed again whether there is a problem with the acquisition line, and the problem will eventually be found and solved, which is obviously inefficient and causes a waste of time. In this embodiment, the 4th and 5th indicator lights are off, which can correctly indicate that the fourth battery cell of the fourth battery unit and the fifth battery cell of the fifth battery unit both have a collection line disconnection failure, which is consistent with the actual simulation situation. It can be seen that this method can quickly and accurately find the collection line failure problem without repeated testing and verification, which greatly improves the test efficiency.

[0045] S32, when it is determined that the first detection result is a normal connection, the positive and negative values ​​of the normally connected acquisition lines are detected to obtain a second detection result. When it is determined that the first detection result is a normal connection, the preset positive and negative values ​​of each acquisition line are determined according to the connection relationship, that is, whether the voltage value collected by the acquisition line should be positive or negative, and then the positive and negative values ​​of the normally connected acquisition lines are detected according to the preset positive and negative values, that is, the reverse voltage detection, to obtain the second detection result, which includes the battery cells whose voltage values ​​do not match the theoretical situation due to disordered acquisition line sequence and the battery cells whose acquisition lines are normally connected.

[0046] S33: When it is determined that the second detection result is a normal connection, an over-voltage or under-voltage detection is performed on the normally connected acquisition line to obtain a third detection result. When it is determined that the second detection result is a normal connection, the preset working voltage of each battery cell is determined, and an over-voltage or under-voltage detection is performed on the normally connected acquisition line according to the connection relationship and the preset working voltage to obtain a third detection result. The third detection result includes battery cells whose voltage values ​​are abnormally displayed due to disordered acquisition line sequence and battery cells whose acquisition lines are normally connected.

[0047] See also Figure 6 and Figure 7, simulating the situation where the B1+ and B3+ acquisition lines are cross-connected. The result obtained by the detection in the prior art is that the 2nd and 3rd indicator lights are both off, indicating that the second battery cell of the second battery unit and the third battery cell of the third battery unit both have a collection line wiring sequence disorder failure. However, due to the common relationship of the acquisition lines, in fact, due to the wiring error, the voltage values ​​collected by the first battery cell and the fourth battery cell will be overvoltage, and the first battery cell of the first battery cell and the fourth battery cell of the fourth battery cell also have wiring problems, and the 1st and 4th indicator lights should not be on. In this embodiment, the 1st to 4th indicator lights are all off, which can correctly indicate that the first to fourth battery cells corresponding to the first battery cell to the fourth battery cell all have a collection line failure, which is consistent with the actual simulation situation.

[0048] The specific circuit structure diagram is as follows Figure 8 As shown, 1 represents the offline detection part, 2 represents the overvoltage detection part, 3 represents the undervoltage detection part, and 4 represents the positive and negative value detection part, that is, the overvoltage protection part.

[0049] The following is a description of a wire harness detection device for a battery pack provided by an embodiment of the present invention. The wire harness detection device for a battery pack described below and the wire harness detection method for a battery pack described above may refer to each other.

[0050] In order to solve the above problems, a wiring harness detection device for a battery pack is provided in this embodiment, which aims to detect the wiring harness of the battery pack before the battery pack is connected to the BMU, obtain more accurate wiring harness detection results, and improve the safety of battery pack assembly of the energy storage battery system. Fig. 9 is a structural schematic diagram of a wiring harness detection method for a battery pack according to an embodiment of the present invention. Fig. 9 As shown, the device may include: The connection determination module 10 is used to determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells.

[0051] Since the battery pack contains several battery cells, each of which contains a battery cell, the battery pack is used to divide the battery cells used for energy storage into many battery modules according to a specific rule, which are used to store electric energy and facilitate real-time monitoring, maintenance and management. In actual production, each battery cell needs to lead out a collection line from its positive and negative poles respectively, that is, one battery cell needs to lead out two collection lines. When these battery cells are connected in series and parallel to form a battery pack, a certain battery cell will share a collection line with its adjacent battery cell. The specific collection line shared is determined by the connection relationship between the positive and negative poles of the battery cell. Therefore, the battery pack has a total of N+1 collection lines, where N represents the number of battery cells in the battery pack.

[0052] The sequence determination module 20 is used to determine the line sequence detection sequence between all battery cells in the battery pack according to the connection relationship and connection rules.

[0053] After the connection relationship between the acquisition line and the battery unit is determined, a line sequence detection order that can correctly obtain the wire harness detection result can be obtained according to the connection relationship.

[0054] Take the battery pack consisting of 13 battery cells and the cells of these battery cells are connected in series as an example. In this way, there are 14 acquisition lines in total for the battery pack. The positive electrode of the first cell corresponding to the first battery cell and the negative electrode of the second cell corresponding to the second battery cell share a acquisition line. The positive electrode of the second cell corresponding to the second battery cell and the negative electrode of the third cell corresponding to the third battery cell share a acquisition line, and so on. In this embodiment, in order to better identify which battery cell has a problem with the wiring harness, a wiring harness with a negative voltage value drawn from the negative electrode is detected, so that the corresponding line sequence detection order is the wiring harness of the first cell negative electrode corresponding to the first battery cell → the positive electrode of the first cell corresponding to the first battery cell and the negative electrode of the second cell corresponding to the second battery cell share a acquisition line → the positive electrode of the second cell corresponding to the second battery cell and the negative electrode of the third cell corresponding to the third battery cell share a acquisition line, until the last wiring harness is detected.

[0055] The line sequence detection module 30 is used to perform line sequence detection on the wire harness in sequence according to the line sequence detection order, and obtain the line sequence detection result according to the connection relationship. In this embodiment, the line sequence detection result is used for the faulty acquisition line, the corresponding faulty battery unit and the cause of the fault. The line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence.

[0056] Preferably, the line sequence detection results can be intuitively displayed through corresponding indicator lights. For example, the battery cells indicated in the line sequence detection results as being normally connected to the acquisition line are prominently prompted by lighting up the indicator lights, while the battery cells and / or acquisition lines indicated in the line sequence detection results as having failed acquisition lines. Of course, the cause of the failure can be displayed through other signal display methods.

[0057] The battery connection module 40 is used to inspect the corresponding acquisition line according to the line sequence detection result, and connect the battery pack to the battery management unit after the inspection is completed.

[0058] Although the existing battery pack line sequence detection method can detect some line sequence problems, there are still some detection blind spots: 1. It cannot detect the disconnection error, that is, the sampling line is not properly connected to the battery cell, but the detection result still indicates that the wiring is normal; 2. It cannot detect over-voltage and under-voltage errors. Taking lithium iron phosphate as an example, the battery voltage exceeds 4V or even higher, and it still indicates that the wiring is normal. In the above situation, connecting the BMU device will also burn the BMU device, and even cause a fire, posing a safety hazard.

[0059] Different from the prior art, in this embodiment, by performing offline detection, positive and negative value detection, and over- and under-voltage detection in sequence, the final line sequence detection result is more accurate and the classification of the fault cause is more accurate. At the same time, based on the connection relationship obtained previously, the line sequence detection result also includes the corresponding faulty battery unit.

[0060] In this way, before connecting the battery pack to the BMU, it is first connected to the wire sequence detection system or device using this method, and the corresponding method can be used to find out which wire harness or wires in the battery pack are faulty. After the wire harness problem is solved, the wire sequence detection system or device is connected again. If no wire harness problem is found at this time, it will be very safe for the battery pack to connect to the BMU again.

[0061] The wiring harness detection device of the battery pack of the present invention determines the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells, and then determines the line sequence detection order between all the battery cells in the battery pack according to the connection relationship and the connection rules, and then performs line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtains the line sequence detection result according to the connection relationship. At the same time, the line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence, which can find out which one or which wire harnesses in the battery pack have a fault. After the wiring harness problem is solved, the line sequence detection system or equipment is connected again. Therefore, it can be used to quickly eliminate the line sequence problem in the battery pack assembly, and can accurately detect the line drop, over-voltage and under-voltage and wiring sequence errors in a single battery cell, which can avoid the line sequence misdetection caused by line drop and over-voltage and under-voltage, and further improve the safety of battery pack assembly of the energy storage battery system.

[0062] Fig.10 An example of a physical structure diagram of an electronic device is shown in FIG. Fig.10As shown, the electronic device may include: a processor 910, a communication interface 920, a memory 930 and a communication bus 940, wherein the processor 910, the communication interface 920 and the memory 930 communicate with each other through the communication bus 940. The processor 910 may call the logic command in the memory 930 to execute the wiring harness detection method of the battery pack, and the method includes: Determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; Determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and connection rules; The wiring harness is sequentially tested in line sequence according to the line sequence test sequence, and the line sequence test result is obtained according to the connection relationship; the line sequence test result is used for the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence test includes the line drop test, the positive and negative value test and the over-voltage and under-voltage test performed in sequence; According to the line sequence detection results, the corresponding acquisition lines are repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

[0063] In addition, the logic instructions in the above-mentioned memory 930 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memor), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0064] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer, the computer can execute the wiring harness detection method of the battery pack provided by the above methods, the method comprising: Determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; Determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and connection rules; The wiring harness is sequentially tested in line sequence according to the line sequence test sequence, and the line sequence test result is obtained according to the connection relationship; the line sequence test result is used for the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence test includes the line drop test, the positive and negative value test and the over-voltage and under-voltage test performed in sequence; According to the line sequence detection results, the corresponding acquisition lines are repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

[0065] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the computer program is implemented to perform the above-mentioned wiring harness detection method for a battery pack, the method comprising: Determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; Determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and connection rules; The wiring harness is sequentially tested in line sequence according to the line sequence test sequence, and the line sequence test result is obtained according to the connection relationship; the line sequence test result is used for the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence test includes the line drop test, the positive and negative value test and the over-voltage and under-voltage test performed in sequence; According to the line sequence detection results, the corresponding acquisition lines are repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack wiring harness detection method, characterized in that: The method comprises: Determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; Determine the line sequence detection order between all battery cells in the battery pack according to the connection relationship and connection rules; The wiring harness is sequentially tested in line sequence according to the line sequence test sequence, and the line sequence test result is obtained according to the connection relationship; the line sequence test result is used for the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence test includes the line drop test, the positive and negative value test and the over-voltage and under-voltage test performed in sequence; According to the line sequence detection results, the corresponding acquisition lines are repaired, and after the repair is completed, the battery pack is connected to the battery management unit.

2. The wire harness detection method of a battery pack according to claim 1, characterized in that: The wire sequence detection is performed on the wire harness in sequence according to the wire sequence detection order, and the wire sequence detection result is obtained according to the connection relationship, specifically including: Performing a line drop detection on each wire harness in turn according to the line sequence detection order to obtain a first detection result; When it is determined that the first detection result is a normal connection, a positive and negative value detection is performed on the normally connected acquisition line to obtain a second detection result; When it is determined that the second detection result is a normal connection, an overvoltage or undervoltage detection is performed on the normally connected acquisition line to obtain a third detection result.

3. The wire harness detection method of a battery pack according to claim 2, characterized in that: The performing disconnection detection on each acquisition line in sequence according to the line sequence detection order to obtain a first detection result specifically includes: Connect all voltage acquisition interfaces of the battery pack to be tested; According to the line sequence detection order and the number of acquisition lines, each acquisition line is sequentially detected for disconnection to obtain a first detection result.

4. The wire harness detection method of a battery pack according to claim 3, characterized in that: When the first detection result is determined to be a normal connection, performing a positive and negative value detection on the normally connected acquisition line to obtain a second detection result specifically includes: When it is determined that the first detection result is a normal connection, the preset positive and negative values ​​of each acquisition line are determined according to the connection relationship; A positive and negative value detection is performed on the normally connected acquisition line according to the preset positive and negative values ​​to obtain a second detection result.

5. The wire harness detection method of a battery pack according to claim 4, characterized in that: When the second detection result is determined to be a normal connection, an over-voltage or under-voltage detection is performed on the normally connected acquisition line to obtain a third detection result, specifically including: When it is determined that the second detection result is a normal connection, determining a preset operating voltage of each battery unit; An over-voltage or under-voltage detection is performed on the normally connected acquisition line according to the connection relationship and the preset working voltage to obtain a third detection result.

6. The wire harness detection method of a battery pack according to claim 1, characterized in that: The determining the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells specifically includes: Determine a first number of battery cells included in the battery pack to be detected, and obtain a connection rule between the battery cells; Detecting the integrity of each battery cell, and determining the second number of acquisition lines according to the number of battery cells and connection rules when it is determined that the battery cells are all intact; The connection relationship between the acquisition line and the battery cell is determined according to the first number of the battery cells and the second number of the battery cells, and the connection relationship is verified using the connection rule, the first number and the second number.

7. The wire harness detection method of a battery pack according to claim 1, characterized in that: The determining of the line sequence detection order between all battery cells in the battery pack according to the connection relationship and the connection rule specifically includes: Determine the connection path of the battery pack to be tested according to the connection rule and the connection relationship; A wiring harness having a negative voltage value in each connection path is determined according to the connection relationship, and a line sequence detection order between all battery cells in the battery pack is determined according to the connection path and the wiring harness having a negative voltage value.

8. A wiring harness detection device for a battery pack, characterized in that: The device comprises: A connection determination module, used to determine the number of acquisition lines and the connection relationship between the acquisition lines and the battery cells according to the number of battery cells included in the battery pack and the connection rules of the battery cells; A sequence determination module, used to determine the line sequence detection sequence between all battery cells in the battery pack according to the connection relationship and connection rules; A line sequence detection module is used to perform line sequence detection on the wiring harness in sequence according to the line sequence detection order, and obtain the line sequence detection result according to the connection relationship; the line sequence detection result is used to identify the failed acquisition line, the corresponding failed battery unit and the cause of the failure, and the line sequence detection includes line drop detection, positive and negative value detection and over-voltage and under-voltage detection performed in sequence; The battery connection module is used to repair the corresponding acquisition line according to the line sequence detection results, and connect the battery pack to the battery management unit after the repair is completed.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the wire harness detection method for a battery pack according to any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the wire harness detection method for a battery pack according to any one of claims 1 to 7 are implemented.

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