Battery pack acquisition line breakage detection method, device and equipment

Abstract

The invention relates to the technical field of automobile circuit control, in particular to a battery pack acquisition line breakage detection method, device and equipment. The invention discloses a battery pack acquisition line breakage detection method, and the method comprises the steps: respectively starting odd equalization and even equalization for single batteries in a battery pack, and determining the first single voltage of each single battery during the odd equalization and the second single voltage of each single battery during the even equalization; according to the first monomer voltage and the second monomer voltage of each battery monomer, determining whether each battery monomer has balanced voltage; and determining whether the acquisition lines connected with the battery monomers are broken or not according to whether the battery monomers have the balanced voltage or not.

Description

Technical Field

[0001] The present application relates to the field of automobile circuit control technology, and specifically to a method, device and equipment for detecting disconnection of a battery pack acquisition line. Background Art

[0002] The Battery Management System (BMS) is a controller installed near the automotive battery pack. It monitors the battery voltage, current, and temperature in real time to achieve functions such as battery insulation detection, thermal management, battery cell balancing management, thermal runaway alarm, charge and discharge power calculation, and SOC&SOH calculation.

[0003] The battery pack contains multiple battery cells. The battery management system obtains the battery pack cell voltage through the acquisition lines connected to the positive and negative poles of each battery cell to monitor the battery. However, when the acquisition line is broken, it is necessary to correctly identify the broken acquisition line so that invalid voltage can be effectively screened out and assist the after-sales service of the car in troubleshooting.

[0004] However, the wire breakage identification method in the related art is only applicable to the case where a single acquisition wire is broken. When multiple acquisition wires are broken, it is impossible to identify whether the middle acquisition wire is broken. Summary of the invention

[0005] The embodiments of the present invention provide a battery pack acquisition line disconnection detection device and equipment to solve the problem that the BMS in the prior art cannot identify the disconnection of multiple acquisition lines.

[0006] In a first aspect, an embodiment of the present invention provides a method for detecting disconnection of a battery pack acquisition line, characterized in that the method comprises: respectively start odd balancing and even balancing for battery cells in the battery pack, and determine a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing; Determining whether a balanced voltage exists for each of the battery cells according to the first cell voltage and the second cell voltage of each of the battery cells; According to whether the battery cells have a balanced voltage, it is determined whether a collection line connected to the battery cells is broken.

[0007] Optionally, the determining whether a collection line connected to the battery cell is disconnected according to whether each battery cell has a balanced voltage includes: Determining whether a first acquisition line and a second acquisition line connected to the first battery cell are disconnected according to whether a balanced voltage exists in the first battery cell; Determine whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell; Determine whether a fourth acquisition line connected to the fifth battery cell is disconnected by determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; The first battery cell is the first battery cell connected to the head end of the battery pack, the second battery cell and the third battery cell are any two adjacent battery cells connected to the middle section of the battery pack, the fifth battery cell is the last battery cell connected to the tail end of the battery pack, and the fourth battery cell is a battery cell adjacent to the fifth battery cell; The first acquisition line is a acquisition line connected to the first battery cell alone, and the second acquisition line is a acquisition line connected to the first battery cell and a battery cell adjacent to the first battery cell.

[0008] Optionally, determining whether a first acquisition line and a second acquisition line connected to the first battery cell are disconnected by determining whether a balanced voltage exists in the first battery cell includes: Determining whether a balanced voltage exists in the first battery cell; When the first battery cell has a balanced voltage, it is determined that the first acquisition line and the second acquisition line connected to the first battery cell are not disconnected; When there is no balancing voltage for the first battery cell, determining whether the voltage difference of the first battery cell during odd-even balancing is greater than a preset value according to the first cell voltage and the second cell voltage of the first battery cell; When the voltage difference of the first battery cell during odd-even balance is not greater than the preset value, determining that the first acquisition line is disconnected; When the voltage difference of the first battery cell during odd-even balance is greater than the preset value, it is determined that the second acquisition line is disconnected.

[0009] Optionally, after determining that the first acquisition line is disconnected, the method further includes: Determine whether the second cell voltage of the first battery cell is zero during even balancing; When the second cell voltage of the first battery cell during even balancing is not zero, it is determined that the second acquisition line is not disconnected; When the second cell voltage of the first battery cell during even balancing is zero, it is determined that the second acquisition line is disconnected.

[0010] Optionally, determining whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell includes: determining whether a balanced voltage exists between the second battery cell and the third battery cell; When the second battery cell and the third battery cell do not have a balanced voltage, it is determined that the third acquisition line is disconnected; When any one of the second battery cell and the third battery cell, or both battery cells have a balanced voltage, it is determined that the third acquisition line is not broken.

[0011] Optionally, determining whether a fourth acquisition line connected to the fifth battery cell is disconnected by determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell includes: determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; When the fourth battery cell has a balanced voltage and the fifth battery cell has no balanced voltage, it is determined that the fourth acquisition line is broken.

[0012] In a second aspect, an embodiment of the present invention provides a battery pack acquisition line disconnection detection device, the device comprising: A balancing module, which respectively starts odd balancing and even balancing for battery cells in the battery pack, and determines a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing; A first determination module, determining whether each of the battery cells has a balanced voltage according to the first cell voltage and the second cell voltage of each of the battery cells; The second determination module determines whether a collection line connected to the battery cell is broken according to whether a balanced voltage exists in each battery cell.

[0013] Optionally, the determining whether a collection line connected to the battery cell is disconnected according to whether each battery cell has a balanced voltage includes: Determining whether a first acquisition line and a second acquisition line connected to the first battery cell are disconnected according to whether a balanced voltage exists in the first battery cell; Determine whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell; Determine whether a fourth acquisition line connected to the fifth battery cell is disconnected by determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; The first battery cell is the first battery cell connected to the head end of the battery pack, the second battery cell and the third battery cell are any two adjacent battery cells connected to the middle section of the battery pack, the fifth battery cell is the last battery cell connected to the tail end of the battery pack, and the fourth battery cell is a battery cell adjacent to the fifth battery cell; The first acquisition line is a acquisition line connected to the first battery cell alone, and the second acquisition line is a acquisition line connected to the first battery cell and a battery cell adjacent to the first battery cell.

[0014] In a third aspect, an embodiment of the present invention provides an electronic device, including: at least one processor; and at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method as described in any one of the first aspects.

[0015] In a fourth aspect, an embodiment of the present invention provides a storage medium, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute any method described in the first aspect.

[0016] In the embodiment of the present invention, based on the circuit characteristics in the BMS system, odd balancing and even balancing are respectively enabled for the battery cells in the battery pack to change the flow direction of the balancing current in the battery pack, thereby detecting the balancing voltage of the battery cells. At the same time, by detecting the balancing voltage of each battery cell, based on the fact that the acquisition line is not broken, it is determined whether it is broken by the balancing voltage of each battery cell, so that the situation of a single acquisition line being broken and the situation of multiple consecutive acquisition lines being broken can be effectively identified. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The figure is a flow chart of a method for detecting disconnection of a battery pack acquisition line provided in an embodiment of the present application; Figure 2 The figure is a schematic diagram of the structure of a battery pack acquisition line disconnection detection device provided in an embodiment of the present application; Figure 3Shown is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0021] The battery management system is a controller installed near the car battery pack. It monitors the battery voltage, current, and temperature in real time to achieve functions such as battery insulation detection, thermal management, battery cell balancing management, thermal runaway alarm, charge and discharge power calculation, SOC&SOH calculation, etc.

[0022] The battery pack contains multiple battery cells. The battery management system obtains the battery pack cell voltage through the acquisition lines connected to the positive and negative poles of each battery cell to monitor the battery. However, when the acquisition line is broken, it is necessary to correctly identify the broken acquisition line so that invalid voltage can be effectively screened out and assist the after-sales service of the car in troubleshooting.

[0023] In the related art, the battery management system usually directly uses the voltage collected by each battery cell in each round for disconnection diagnosis. For example, when battery cell 1 or battery cell N has no voltage, and the voltage of other cells is normal, it is determined that the collection line 1 or collection line N+1 connected to it is disconnected; when battery cell 1 has no voltage and battery cell 2 has no voltage, and the voltage of other battery cells is normal, it is determined that the collection line 2 connecting battery cell 1 and battery cell 2 is disconnected; when battery cell N-1 has no voltage and battery cell N has no voltage, and the voltage of other battery cells is normal, it is determined that the collection line N connecting them is disconnected.

[0024] However, this identification method is only applicable to the case where a single acquisition line is broken. When multiple acquisition lines are broken, it is impossible to identify whether the middle acquisition line is broken.

[0025] like Figure 1 FIG. 1 is a flow chart of a method for detecting disconnection of a battery pack acquisition line provided by an embodiment of the present invention. Figure 1 The specific steps of the method include: S101 , respectively start odd balancing and even balancing for battery cells in a battery pack, and determine a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing.

[0026] Specifically, when odd balancing is enabled, the battery cells in the odd-numbered items in the battery pack are connected respectively, such as the 1st, 3rd, 5th, 7th, and 9th battery cells in the battery pack. When even balancing is enabled, the battery cells in the even-numbered items in the battery pack are connected respectively, such as the 2nd, 4th, 6th, 8th, and 10th battery cells in the battery pack.

[0027] The battery cells in the battery pack can be divided into five categories of battery cells due to their different distribution in the battery pack: a first battery cell, a second battery cell, a third battery cell, a fourth battery cell and a fifth battery cell.

[0028] The first battery cell is the first battery cell connected to the front end of the battery pack, the second battery cell and the third battery cell are any two adjacent battery cells connected to the middle section of the battery pack, the fifth battery cell is the last battery cell connected to the rear end of the battery pack, and the fourth battery cell is the battery cell adjacent to the fifth battery cell, that is, the second to last battery cell.

[0029] S102 , determining whether each battery cell has a balanced voltage according to the first battery cell voltage and the second battery cell voltage of each battery cell.

[0030] Specifically, by comparing the first cell voltage and the second cell voltage of each battery cell, it is determined whether there is a balanced voltage among the battery cells.

[0031] S103, determining whether a collection line connected to the battery cell is disconnected according to whether each battery cell has a balanced voltage.

[0032] The acquisition lines in the battery pack can be divided into four types of acquisition lines due to different connection positions, that is, different types of connected battery cells: the first acquisition line, the second acquisition line, the third acquisition line and the fourth acquisition line.

[0033] Among them, the first acquisition line is a collection line connected solely to the first battery cell, the second acquisition line is a collection line connected to the first battery cell and its adjacent battery cell at the same time, the fourth acquisition line is a collection line connected solely to the fifth battery cell, and the third acquisition line is the remaining collection lines in the battery pack, that is, the collection lines connecting the middle section of the battery pack with any two battery cells.

[0034] Specifically, whether the first acquisition line and the second acquisition line connected to the first battery cell are broken is determined by whether there is a balanced voltage between the first battery cell; whether the third acquisition line is broken is determined by whether there is a balanced voltage between the second battery cell and the third battery cell; and whether the fourth acquisition line is broken is determined by whether there is a balanced voltage between the fourth battery cell and the fifth battery cell.

[0035] When determining the states of the first acquisition line and the second acquisition line by the equalization voltage of the first battery cell, it is necessary to first determine whether the equalization voltage exists in the first battery cell.

[0036] When the first battery cell has an equalizing voltage, it is determined that the first acquisition line and the second acquisition line connected to the first battery cell are not broken; when the first battery cell does not have an equalizing voltage, it is determined that one of the first acquisition line and the second acquisition line is broken, or both of the first acquisition line and the second acquisition line are broken.

[0037] Furthermore, it is also necessary to specifically judge the disconnection status of the first acquisition line and the second acquisition line. The first cell voltage and the second cell voltage of the first battery cell are determined to determine whether the voltage difference during odd-even balance is greater than a preset value. When the voltage difference of the first battery cell during odd-even balance is not greater than the preset value, it is determined that the first acquisition line is disconnected; when the voltage difference of the first battery cell during odd-even balance is greater than the preset value, it is determined that the second acquisition line is disconnected, and the first acquisition line is not disconnected.

[0038] After determining that the first acquisition line is broken, since the state of the second acquisition line has not yet been determined, it is necessary to judge it through the second cell voltage of the first battery cell during even balancing. Determine whether the second cell voltage of the first battery cell during even balancing is zero. When the second cell voltage of the first battery cell during even balancing is not zero, it is determined that the second acquisition line is not broken; when the second cell voltage of the first battery cell during even balancing is zero, it is determined that the second acquisition line is broken.

[0039] When determining the state of the third acquisition line through the second battery cell and the third battery cell, it is necessary to determine whether both the second battery cell and the third battery cell have an equalizing voltage. When both the second battery cell and the third battery cell do not have an equalizing voltage, it is determined that the third acquisition line is disconnected; when any one of the second battery cell and the third battery cell, or both battery cells, have an equalizing voltage, it is determined that the third acquisition line is not disconnected.

[0040] When the state of the fourth acquisition line is determined by the fourth battery cell and the fifth battery cell, it is necessary to determine whether the fourth battery cell and the fifth battery cell have an equalizing voltage. When the fourth battery cell has an equalizing voltage and the fifth battery cell does not have an equalizing voltage, it is determined that the fourth acquisition line is broken; otherwise, it is determined that the line is not broken.

[0041] In the embodiment of the present invention, the disconnection detection performed on the first and second acquisition lines, the disconnection detection performed on the third acquisition line, and the disconnection detection performed on the fourth acquisition line can be performed in sequence to complete the detection of all acquisition lines in the battery pack, and the detection order is not limited. Optionally, the disconnection detection of a certain type of acquisition line can also be performed separately.

[0042] In the embodiment of the present invention, based on the circuit characteristics in the BMS system, odd balancing and even balancing are respectively enabled for the battery cells in the battery pack to change the flow direction of the balancing current in the battery pack, thereby detecting the balancing voltage of the battery cells. At the same time, by detecting the balancing voltage of each battery cell, based on the fact that the acquisition line is not broken, it is determined whether it is broken by the balancing voltage of each battery cell, so that the situation of a single acquisition line being broken and the situation of multiple consecutive acquisition lines being broken can be effectively identified.

[0043] Corresponding to the above-mentioned battery pack acquisition line disconnection detection method, the present application embodiment also provides a battery pack acquisition line disconnection detection device, which is applied to a battery management system. Figure 2 , is a structural schematic diagram of a battery pack acquisition line break detection device provided in an embodiment of the present application. The battery pack acquisition line break detection device may include: a balancing module 201, a first determination module 202 and a second determination module 203.

[0044] The balancing module 201 respectively starts odd balancing and even balancing for the battery cells in the battery pack, and determines a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing.

[0045] The first determination module 202 determines whether each of the battery cells has a balanced voltage according to the first cell voltage and the second cell voltage of each of the battery cells.

[0046] The second determination module 203 determines whether a collection line connected to the battery cell is broken according to whether a balanced voltage exists in each battery cell.

[0047] Figure 3 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present specification. Figure 3 As shown, the electronic device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein: the memory stores program instructions executable by the processing unit, and the processor calls the program instructions to execute the battery pack acquisition line break detection method provided in this embodiment.

[0048] The electronic device can be a device capable of intelligently communicating with a user, such as a cloud server, and the specific form of the electronic device is not limited in the embodiments of this specification. It can be understood that the electronic device here is the machine mentioned in the method embodiment.

[0049] Figure 3 A block diagram of an exemplary electronic device suitable for implementing the embodiments of the present description is shown. Figure 3The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of this specification.

[0050] like Figure 3 As shown, the electronic device is in the form of a general computing device. The components of the electronic device may include but are not limited to: one or more processors 310, a communication interface 320, a memory 330, and a communication bus 340 connecting different system components (including the memory 330, the communication interface 320 and the processor 310).

[0051] The communication bus 340 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnection (PCI) bus.

[0052] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0053] The memory 330 may include a computer system readable medium in the form of a volatile memory, such as a random access memory (RAM) and / or a cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 330 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of each embodiment of the present specification.

[0054] A program / utility having a set (at least one) of program modules may be stored in memory 330, such program modules including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules generally perform the functions and / or methods of the embodiments described in this specification.

[0055] The processor 310 executes various functional applications and data processing by running the programs stored in the memory 330, such as implementing the battery pack acquisition line disconnection detection method provided in the embodiment shown in this specification.

[0056] An embodiment of the present specification provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the battery pack acquisition line disconnection detection method provided in the embodiment shown in the present specification.

[0057] The above-mentioned non-transitory computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ReadOnly Memory; hereinafter referred to as: ROM), an erasable programmable read-only memory (Erasable Programmable ReadOnly Memory; hereinafter referred to as: EPROM) or flash memory, optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0058] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0059] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0060] Computer program code for performing the operations of this specification may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0061] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this specification, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of this specification belong.

[0064] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0065] It should be noted that the terminals involved in the embodiments of this specification may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 players, MP4 players, etc.

[0066] In the embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0067] In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0068] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the method described in each embodiment of this specification.

[0069] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A method for detecting disconnection of a battery pack acquisition line, characterized in that: The method comprises: respectively start odd balancing and even balancing for battery cells in the battery pack, and determine a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing; Determining whether a balanced voltage exists for each of the battery cells according to the first cell voltage and the second cell voltage of each of the battery cells; According to whether the battery cells have a balanced voltage, it is determined whether a collection line connected to the battery cells is broken.

2. The method according to claim 1, characterized in that The determining whether a collection line connected to the battery cell is disconnected according to whether a balanced voltage exists in each battery cell comprises: Determining whether a first acquisition line and a second acquisition line connected to the first battery cell are disconnected according to whether a balanced voltage exists in the first battery cell; Determine whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell; Determine whether a fourth acquisition line connected to the fifth battery cell is disconnected by determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; The first battery cell is the first battery cell connected to the head end of the battery pack, the second battery cell and the third battery cell are any two adjacent battery cells connected to the middle section of the battery pack, the fifth battery cell is the last battery cell connected to the tail end of the battery pack, and the fourth battery cell is a battery cell adjacent to the fifth battery cell; The first acquisition line is a acquisition line connected to the first battery cell alone, and the second acquisition line is a acquisition line connected to the first battery cell and a battery cell adjacent to the first battery cell.

3. The method according to claim 2, characterized in that The determining whether the first acquisition line and the second acquisition line connected to the first battery cell are disconnected by determining whether the first battery cell has an equalizing voltage comprises: Determining whether a balanced voltage exists in the first battery cell; When the first battery cell has a balanced voltage, it is determined that the first acquisition line and the second acquisition line connected to the first battery cell are not disconnected; When there is no balancing voltage for the first battery cell, determining whether the voltage difference of the first battery cell during odd-even balancing is greater than a preset value according to the first cell voltage and the second cell voltage of the first battery cell; When the voltage difference of the first battery cell during odd-even balance is not greater than the preset value, determining that the first acquisition line is disconnected; When the voltage difference of the first battery cell during odd-even balance is greater than the preset value, it is determined that the second acquisition line is disconnected.

4. The method according to claim 3, characterized in that After determining that the first acquisition line is disconnected, the method further includes: Determine whether the second cell voltage of the first battery cell is zero during even balancing; When the second cell voltage of the first battery cell during even balancing is not zero, it is determined that the second acquisition line is not disconnected; When the second cell voltage of the first battery cell during even balancing is zero, it is determined that the second acquisition line is disconnected.

5. The method according to claim 2, characterized in that: The determining whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell includes: determining whether a balanced voltage exists between the second battery cell and the third battery cell; When the second battery cell and the third battery cell do not have a balanced voltage, it is determined that the third acquisition line is disconnected; When any one of the second battery cell and the third battery cell, or both battery cells have a balanced voltage, it is determined that the third acquisition line is not broken.

6. The method according to claim 2, characterized in that The determining whether the fourth acquisition line connected to the fifth battery cell is disconnected by determining whether the fourth battery cell and the fifth battery cell have a balanced voltage includes: determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; When the fourth battery cell has a balanced voltage and the fifth battery cell has no balanced voltage, it is determined that the fourth acquisition line is broken.

7. A battery pack collection line disconnection detection device, characterized in that: The device comprises: A balancing module, which respectively starts odd balancing and even balancing for battery cells in the battery pack, and determines a first cell voltage of each battery cell during odd balancing and a second cell voltage of each battery cell during even balancing; A first determination module, determining whether each of the battery cells has a balanced voltage according to the first cell voltage and the second cell voltage of each of the battery cells; The second determination module determines whether a collection line connected to the battery cell is broken according to whether a balanced voltage exists in each battery cell.

8. The device according to claim 7, characterized in that The determining whether a collection line connected to the battery cell is disconnected according to whether a balanced voltage exists in each battery cell comprises: Determining whether a first acquisition line and a second acquisition line connected to the first battery cell are disconnected according to whether a balanced voltage exists in the first battery cell; Determine whether a third acquisition line commonly connected to the second battery cell and the third battery cell is disconnected by determining whether a balanced voltage exists between the second battery cell and the third battery cell; Determine whether a fourth acquisition line connected to the fifth battery cell is disconnected by determining whether a balanced voltage exists between the fourth battery cell and the fifth battery cell; The first battery cell is the first battery cell connected to the head end of the battery pack, the second battery cell and the third battery cell are any two adjacent battery cells connected to the middle section of the battery pack, the fifth battery cell is the last battery cell connected to the tail end of the battery pack, and the fourth battery cell is a battery cell adjacent to the fifth battery cell; The first acquisition line is a acquisition line connected to the first battery cell alone, and the second acquisition line is a acquisition line connected to the first battery cell and a battery cell adjacent to the first battery cell.

9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 6 by calling the program instructions.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

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