Line disconnection detection method and circuit for voltage acquisition channel, device, vehicle and medium

Abstract

A line disconnection detection method for a voltage acquisition channel (100). A voltage acquisition line (10) is connected to battery cells (110) in a battery pack (1000), and to voltage acquisition sub-circuits (20) that correspond to the battery cells (110) and are used for acquiring voltages of the battery cells (110). The method comprises: when whether a line disconnection occurs is checked, first controlling a control switch (21) of a voltage acquisition sub-circuit (20) to be turned on or turned off (01); then acquiring the voltage of a first battery cell and the voltage of a second battery cell (02); and, on the basis of the voltage of the first battery cell, the voltage of the second battery cell and a preset threshold, determining whether a line disconnection occurs in a voltage sampling channel connected to the first battery cell (03).

Description

Method and circuit for detecting disconnection of voltage acquisition channel, device, vehicle and medium

[0001] Priority information

[0002] The present disclosure claims priority to and the benefit of the patent application No. 202411392475.X filed with the China National Intellectual Property Office on September 30, 2024, and incorporates it herein in its entirety by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of disconnection detection, and more particularly, to a method for detecting disconnection of a voltage acquisition channel, a circuit for detecting disconnection of a voltage acquisition channel, an electronic device, a vehicle and a computer readable storage medium. BACKGROUND

[0004] With the development of new energy vehicles, the functional requirements of automobile products are also increasingly high. The battery management system of a new energy vehicle collects and monitors the voltage of a single battery through a sampling chip. If the voltage acquisition line connected between the single battery and the sampling chip is disconnected, the collected battery voltage will be inaccurate. The diagnostic function of the sampling chip can be used to diagnose whether the voltage acquisition line is disconnected.

[0005] Different sampling chips have different diagnostic processes for disconnection, and the universality is low. Targeted software development is required for different chips, and the control is complex. SUMMARY

[0006] The present disclosure provides a method for detecting disconnection of a voltage acquisition channel, a circuit for detecting disconnection of a voltage acquisition channel, an electronic device, a vehicle and a computer readable storage medium.

[0007] The present disclosure provides a method for detecting disconnection of a voltage acquisition channel, the voltage acquisition channel comprising a voltage acquisition line and a voltage acquisition subcircuit, the voltage acquisition line connecting a single battery of a battery pack and the voltage acquisition subcircuit corresponding to the single battery, the voltage acquisition subcircuit being configured to acquire the voltage of the corresponding single battery through the voltage acquisition line, the single battery comprising a first single battery and a second single battery adjacent to the first single battery, the method comprising:

[0008] controlling the control switch of the voltage acquisition subcircuit to be closed or opened;

[0009] acquiring a first voltage of the first single battery and a second voltage of the second single battery;

[0010] determining the disconnection state of the voltage acquisition channel connected to the first single battery according to the first voltage, the second voltage and a set threshold.

[0011] Thus, in the disconnection detection method, disconnection detection circuit, disconnection detection device, electronic device, vehicle and computer readable storage medium of the embodiments of the present disclosure, when there is a disconnection in the voltage collection channel, there is a large difference between the voltage of the two adjacent single batteries after the control switch of the voltage collection sub-circuit is closed and the voltage when there is no disconnection. Therefore, according to the first voltage of the first single battery, the second voltage of the second single battery adjacent to the first single battery and the set threshold value obtained after the control switch is closed, it can be determined whether there is a disconnection in the voltage collection channel connected to the first single battery, without using the diagnostic process of the sampling chip, and can be used for disconnection detection with various sampling chips, and has strong universality.

[0012] In some embodiments, the battery pack includes a plurality of sequentially connected single batteries, each of the single batteries corresponds to one of the voltage collection sub-circuits, and the closing or opening of the control switch for controlling the voltage collection sub-circuit includes:

[0013] controlling the control switch of the first sequence voltage collection sub-circuit to be closed, the first sequence voltage collection sub-circuit including the voltage collection sub-circuit corresponding to the 2k-1th single battery in the battery pack;

[0014] controlling the control switch of the second sequence voltage collection sub-circuit to be opened, the second sequence voltage collection sub-circuit including the voltage collection sub-circuit corresponding to the 2kth single battery in the battery pack, so that the battery pack is in a first state, wherein k is an integer greater than or equal to 1;

[0015] the first voltage of the first single battery and the second voltage of the second single battery are obtained, including:

[0016] obtaining the first voltage of the first single battery in the first state and the second voltage of the second single battery in the first state.

[0017] In some embodiments, the set threshold value includes a first set value and a second set value, the first set value is greater than the second set value, and in the case that the first single battery is the 2k-1th single battery and the second single battery is the 2kth single battery, the determination of the disconnection state of the voltage collection channel connected to the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0018] in the first state, if the first voltage is less than the second set value and the second voltage is greater than the first set value, it is determined that there is a disconnection in the voltage collection line connected to the positive electrode of the first single battery.

[0019] In some embodiments, the set threshold value includes a first set value and a second set value, the first set value is greater than the second set value, in the case that the first single battery is the 2kth single battery and the second single battery is the 2k+1th single battery, the determining the disconnection state of the voltage acquisition channel connected with the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0020] In the first state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, it is determined that the voltage acquisition line connected with the positive electrode of the first single battery exists disconnection.

[0021] In some embodiments, the battery pack includes a plurality of single batteries connected in sequence, each single battery corresponds to a voltage acquisition subcircuit, and the control of the on or off of the control switch of the voltage acquisition subcircuit includes:

[0022] controlling the control switch of the first sequence voltage acquisition subcircuit to be off, the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single battery in the battery pack;

[0023] controlling the control switch of the second sequence voltage acquisition subcircuit to be on, the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2kth single battery in the battery pack, so that the battery pack is in a second state, wherein k is an integer greater than or equal to 1;

[0024] The obtaining of the first voltage of the first single battery and the second voltage of the second single battery includes:

[0025] obtaining the first voltage of the first single battery in the second state and the second voltage of the second single battery in the second state.

[0026] In some embodiments, the set threshold value includes a first set value and a second set value, in the case that the first single battery is the 2kth single battery and the second single battery is the 2k+1th single battery, the determining the disconnection state of the voltage acquisition channel connected with the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0027] In the second state, if the first voltage is less than the second set value and the second voltage is greater than the first set value, it is determined that the voltage acquisition line connected with the positive electrode of the first single battery exists disconnection.

[0028] In some embodiments, the set threshold value includes a first set value and a second set value, and the determining the disconnection state of the voltage acquisition channel connected to the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0029] In the second state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, it is determined that the voltage acquisition line connected to the positive electrode of the first single battery is disconnected.

[0030] In some embodiments, the disconnection detection method further includes:

[0031] disconnecting the control switches of all the voltage acquisition sub-circuits to make the battery pack in a third state;

[0032] The obtaining the first voltage of the first single battery and the second voltage of the second single battery includes:

[0033] obtaining the first voltage of the first single battery in the third state and the second voltage of the second single battery in the third state.

[0034] In some embodiments, the battery pack includes a plurality of single batteries connected in sequence, the second single battery is the previous single battery or the next single battery of the first single battery in the battery pack, the set threshold value includes a first voltage threshold value being a positive value and a second voltage threshold value being a negative value, and the determining the disconnection state of the voltage acquisition channel connected to the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0035] In the third state, if the target difference value of the first voltage is greater than the first voltage threshold value and the target difference value of the second voltage is less than the second voltage threshold value, it is determined that the voltage acquisition line connected to the positive electrode of the first single battery is disconnected, and the target difference value is the difference between the average single battery voltage and the voltage.

[0036] In some embodiments, the battery pack includes a plurality of single batteries connected in sequence, the second single battery is the previous single battery or the next single battery of the first single battery in the battery pack, the set threshold value includes a first voltage threshold value being a positive value and a second voltage threshold value being a negative value, and the determining the disconnection state of the voltage acquisition channel connected to the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0037] In the third state, if the target difference value of the first voltage is less than the second voltage threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage acquisition line connected with the positive electrode of the first single battery has a disconnection, and the target difference value is the difference between the average single battery voltage and the voltage.

[0038] In some embodiments, the battery pack includes a plurality of sequentially connected single batteries, the set threshold value includes a first voltage threshold value which is a positive value and a second set value, the first single battery is ranked first in the battery pack, and the second single battery is ranked second in the battery pack, and the method for determining the disconnection state of the voltage acquisition channel connected with the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0039] In the case where the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage acquisition line connected with the negative electrode of the first single battery has a disconnection, and the target difference value is the difference between the average single battery voltage and the voltage.

[0040] In some embodiments, the battery pack includes m sequentially connected single batteries, the set threshold value includes a second set value and a first voltage threshold value which is a positive value, the first single battery is ranked mth in the battery pack, and the second single battery is ranked m-1th in the battery pack, and the method for determining the disconnection state of the voltage acquisition channel connected with the first single battery according to the first voltage, the second voltage and the set threshold value includes:

[0041] In the case where the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage acquisition line connected with the positive electrode of the first single battery has a disconnection, and the target difference value is the difference between the average single battery voltage and the voltage, wherein m is a positive integer greater than 1.

[0042] In some embodiments, the battery pack includes a plurality of sequentially connected single batteries, and the disconnection detection method further includes:

[0043] The control switch of the first sequence voltage acquisition sub-circuit is turned on, the first sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit corresponding to the 2k-1th single battery in the battery pack;

[0044] The third voltage of the 2k-1th single battery in the battery pack is obtained;

[0045] determining, according to the third voltage and a first target current, a line resistance state of a voltage collection line connected to the 2k-1th single battery in the battery pack, wherein k is an integer greater than or equal to 1, the first target current is determined according to a voltage or a single voltage average of the 2k-1th single battery in a third state, and all the control switches are open in the case that the battery pack is in the third state.

[0046] In some embodiments, the voltage collection sub-circuit includes a plurality of resistors, the resistors, the single battery and the control switch form a first target loop in the case that the control switch of the voltage collection sub-circuit is closed, the first target current is a current in the first target loop, and the determining, according to the third voltage and a first target current, a line resistance state of a voltage collection line connected to the 2k-1th single battery in the battery pack includes:

[0047] determining a first reference voltage according to the first target current, an internal resistance of the control switch and a resistance value of the resistor;

[0048] determining that the line resistance of the voltage collection line connected to the 2k-1th single battery in the battery pack is too large in the case that the third voltage is less than the first reference voltage.

[0049] In some embodiments, the battery pack includes a plurality of single batteries connected in sequence, and the disconnection detection method further includes, in the case that it is determined that all the voltage collection lines do not have disconnections:

[0050] controlling the control switch of a second sequence voltage collection sub-circuit to be closed, the second sequence voltage collection sub-circuit including the voltage collection sub-circuit corresponding to the 2kth single battery in the battery pack;

[0051] obtaining a fourth voltage of the 2kth single battery in the battery pack;

[0052] determining, according to the fourth voltage and a second target current, a line resistance state of a voltage collection line connected to the 2kth single battery in the battery pack, wherein k is an integer greater than or equal to 1, the second target current is determined according to a voltage or a single voltage average of the 2kth single battery in a third state, and all the control switches are open in the case that the battery pack is in the third state.

[0053] In some embodiments, the voltage acquisition sub-circuit includes a plurality of resistors, and when the control switch of the voltage acquisition sub-circuit is closed, the resistors, the single battery and the control switch form a second target loop, the second target current is a current in the second target loop, and the determination of the line resistance state of the voltage acquisition line connected to the 2kth single battery in the battery pack according to the fourth voltage and the second target current includes:

[0054] determining a second reference voltage according to the second target current, the internal resistance of the control switch and the resistance value of the resistor;

[0055] when the fourth voltage is less than the second reference voltage, determining that the line resistance of the voltage acquisition line connected to the 2kth single battery in the battery pack is too large.

[0056] In some embodiments, the line break detection method further includes:

[0057] obtaining a mean value of the single voltages of all the single batteries;

[0058] when the mean value of the single voltages is within a preset voltage range, determining to perform line break detection to determine the line break state of the voltage acquisition channel;

[0059] when the mean value of the single voltages is outside the preset voltage range, determining not to perform the line break detection.

[0060] In some embodiments, the threshold value includes a first set value and a second set value, the second set value is less than the first set value, the first set value is determined according to the mean value of the single voltages and the voltage drop of the control switch, and the second set value is determined according to the voltage drop of the control switch.

[0061] The disclosure provides a line break detection circuit of a voltage acquisition channel, the voltage acquisition channel including a voltage acquisition line and a voltage acquisition sub-circuit, the line break detection circuit including a voltage acquisition sub-circuit and a sampling chip, the voltage acquisition line connecting single batteries of a battery pack and voltage acquisition sub-circuits corresponding to the single batteries, the voltage acquisition sub-circuit being configured to acquire voltages of the corresponding single batteries through the voltage acquisition line and input the voltages to the sampling chip, the single batteries including a first single battery and a second single battery adjacent to the first single battery, and the sampling chip being configured to:

[0062] control the control switch of the voltage acquisition sub-circuit to be closed or opened;

[0063] acquire a first voltage of the first single battery and a second voltage of the second single battery;

[0064] According to the first voltage, the second voltage and the set threshold value, a disconnection state of a voltage collection channel connected with the first single battery is determined.

[0065] In some embodiments, a positive electrode of the single battery is connected with a first voltage collection line, a negative electrode of the single battery is connected with a second voltage collection line, the single battery is connected with the voltage collection sub-circuit through the first voltage collection line and the second voltage collection line, the voltage collection sub-circuit comprises a first detection resistor, a second detection resistor and the control switch, the control switch is arranged between the first voltage collection line and the second voltage collection line, a first pole of the control switch is connected with the first voltage collection line through the first detection resistor, a second pole of the control switch is connected with the second voltage collection line through the second detection resistor, and a control pole of the control switch is connected with a control port of the sampling chip, the control port is configured to control on-off of the control switch.

[0066] In some embodiments, when the control switch is closed, the single battery, the first detection resistor, the second detection resistor and the control switch form a target loop, and the target loop is configured to determine a line resistance state of the first detection line.

[0067] In some embodiments, the voltage collection sub-circuit further comprises a first sampling resistor and a second sampling resistor, the first detection resistor is connected with a first sampling port of the sampling chip through the first sampling resistor, and the second detection resistor is connected with a second sampling port of the sampling chip through the second sampling resistor, the first sampling port and the second sampling port are configured to collect voltage of the single battery.

[0068] The electronic device provided by the embodiments of the present disclosure comprises one or more processors and a memory, and the memory stores a computer program. When the computer program is executed by the processor, the steps of the disconnection detection method according to any one of the above embodiments are implemented.

[0069] The vehicle provided by the embodiments of the present disclosure comprises the disconnection detection circuit according to any one of the above embodiments or the electronic device according to any one of the above embodiments.

[0070] The computer readable storage medium provided by the embodiments of the present disclosure stores a computer program. When the computer program is executed by a processor, the steps of the disconnection detection method according to any one of the above embodiments are implemented.

[0071] Additional aspects and advantages of the present disclosure will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0072] The above and / or additional aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0073] FIG. 1 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0074] FIG. 2 is a partial schematic diagram of a battery pack and a disconnection detection circuit according to certain embodiments of the present disclosure;

[0075] FIG. 3 is a partial schematic diagram of a battery pack and a disconnection detection circuit according to certain embodiments of the present disclosure;

[0076] FIG. 4 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0077] FIG. 5 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0078] FIG. 6 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0079] FIG. 7 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0080] FIG. 8 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0081] FIG. 9 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0082] FIG. 10 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0083] FIG. 11 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0084] FIG. 12 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0085] FIG. 13 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0086] FIG. 14 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0087] FIG. 15 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0088] FIG. 16 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0089] FIG. 17 is a flowchart of a disconnection detection method according to certain embodiments of the present disclosure;

[0090] FIG. 18 is a flowchart of a disconnection detection method according to some embodiments of the present disclosure;

[0091] FIG. 19 is a flowchart of a disconnection detection method according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0092] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are illustrated in the drawings, wherein the same or similar notations denote the same or similar elements throughout. The embodiments described below with reference to the drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present disclosure.

[0093] With the development of new energy vehicles, the functional requirements of automobile products are also increasing. The battery management system of a new energy vehicle collects and monitors the voltage of a single battery through a sampling chip. If the voltage collection line connected to the sampling chip of the single battery is disconnected, it will cause the collected battery voltage to be inaccurate. The diagnostic function of the sampling chip can be used to diagnose whether the voltage collection line is disconnected.

[0094] Different sampling chips have different disconnection diagnosis processes, and the universality is low. Different chips need to be developed for specific software, and the control is complex.

[0095] Based on the above problems to be solved, please refer to FIGS. 1-3, the disconnection detection method of the voltage collection channel 100 provided by the embodiments of the present disclosure, the voltage collection channel 100 includes a voltage collection line 10 and a voltage collection sub-circuit 20, the voltage collection line 10 is connected to a single battery 110 of a battery pack 1000 and a voltage collection sub-circuit 20 corresponding to the single battery 110, the voltage collection sub-circuit 20 is configured to collect the voltage of the corresponding single battery 110 through the voltage collection line 10, the single battery 110 includes a first single battery and a second single battery adjacent to the first single battery, the disconnection detection method includes:

[0096] 01: control the control switch 21 of the voltage collection sub-circuit 20 to be closed or disconnected;

[0097] 02: collect the first voltage of the first single battery and the second voltage of the second single battery;

[0098] 03: according to the first voltage, the second voltage and the set threshold value, determine the disconnection state of the voltage collection channel 100 connected to the first single battery.

[0099] The embodiment of the present disclosure provides an electronic device, which comprises one or more processors and a memory, the memory stores a computer program which can be executed by the processor. The processor can be used to control the control switch 21 of the voltage acquisition sub-circuit 20 to be closed or opened, and to acquire the first voltage of the first single battery and the second voltage of the second single battery, and to determine the disconnection state of the voltage acquisition channel 100 connected with the first single battery according to the first voltage, the second voltage and a set threshold.

[0100] The embodiment of the present disclosure provides a disconnection checking device of the voltage acquisition circuit 10, which comprises a first control module, a first acquisition module and a first determination module. The first control module can be used to control the control switch 21 of the voltage acquisition sub-circuit 20 to be closed or opened, the first acquisition module can be used to acquire the first voltage of the first single battery and the second voltage of the second single battery, and the first determination module can be used to determine the disconnection state of the voltage acquisition channel 100 connected with the first single battery according to the first voltage, the second voltage and a set threshold.

[0101] Specifically, the battery pack 1000 comprises n single batteries 110 connected in series in order, and the order of the single batteries 110 increases from negative to positive, wherein n is an integer greater than 0. FIG. 2 is an embodiment diagram of the battery pack 1000 comprising 16 single batteries 110. The negative electrode of any single battery 110 except the first single battery 110 is connected with the positive electrode of the adjacent single battery 110, and the positive electrode of any single battery 110 except the last single battery 110 is connected with the negative electrode of the adjacent single battery 110.

[0102] One single battery 110 is connected with the sampling chip 30 through one voltage acquisition channel 100, one voltage acquisition channel 100 comprises two voltage acquisition circuits 10 and one voltage acquisition sub-circuit 20, and two adjacent voltage acquisition channels 100 share one voltage acquisition circuit 10. The voltage acquisition sub-circuit 20 of the voltage acquisition channel 100 is connected with the single battery 110 one by one, the positive electrode of one single battery 110 is connected with one voltage acquisition sub-circuit 20 through one voltage acquisition circuit 10, and the negative electrode of one single battery 110 is connected with one voltage acquisition sub-circuit 20 through the other voltage acquisition circuit 10.

[0103] The connection points of the positive and negative electrodes of the two adjacent single batteries 110 are connected to one voltage collection line 10, that is, the two adjacent voltage collection sub-circuits 20 share one voltage collection line 10 to connect the single batteries 110 on the side close to each other. The voltage collection sub-circuit 20 is also connected to a sampling chip 30, which is used to acquire the voltage collected by the voltage collection sub-circuit 20 and to control the on and off of the control switch 21 of the voltage collection sub-circuit 20. It is worth noting that one battery pack 1000 can use multiple sampling chips 30 for voltage collection. For example, the battery pack 1000 includes 60 single batteries 11, and one sampling chip 30 can collect the voltage of 16 single batteries 11. Therefore, 60 single batteries 11 need 4 sampling chips 30 for voltage collection.

[0104] The voltage collection sub-circuit 20 further includes a detection resistor and a sampling resistor. The control switch 21 is connected between the two adjacent voltage collection lines 10, and the first end of the control switch 21 is connected to one voltage collection line 10 through a detection resistor, and the second end of the control switch 21 is connected to the other voltage collection line 10 through another detection resistor.

[0105] The control switch 21 can be an NPN transistor, an N-type transistor, a P-type transistor, or any other switch element that can switch on and off, which is not limited herein. In the embodiment of the present disclosure, the control switch 21 is an NPN transistor.

[0106] The first single battery can be any single battery 110 in the battery pack 1000, and the second single battery is the single battery 110 adjacent to the first single battery in the battery pack 1000.

[0107] The control port CBn (n≥1, and n is a positive integer) of the sampling chip 30 is connected to the control end of the control switch 21 and can control the on and off of the control switch 21 to switch the state of the single battery 110 of the battery pack 1000. The sampling port Vcn of the sampling chip 30 is used to collect the voltage Vcell[n] of the single battery 110, and the two adjacent sampling ports are used to collect the voltage Vcell[n] of one single battery 110, for example, Vc0 and Vc1 are used to collect the voltage Vcell[1] of the first single battery B1 together; Vc16 and Vc15 are used to collect the voltage Vcell

[0016] of the 16th single battery B16 together.

[0108] In the absence of a broken line in the voltage acquisition channel 100, the voltages of the plurality of single batteries 110 are relatively balanced and maintained within a certain suitable range. The voltage acquisition sub-circuit 20 of the voltage acquisition channel 100 can be arranged on a hardware circuit board and is not prone to broken lines. However, if it is found in the inspection that the voltage acquisition channel 100 has a broken line, and it is found that the voltage acquisition line 11 is not broken, it can be determined that the voltage acquisition sub-circuit 20 has a broken line inside.

[0109] The voltage acquisition line 10 of the voltage acquisition channel 100 is a wire harness directly connected to the single battery 110 and is prone to broken lines. The disclosure is described by taking the broken line of the voltage acquisition line 10 as an example. Since the two adjacent voltage acquisition sub-circuits 20 share one voltage acquisition line 10, in the case of a broken line in the voltage acquisition line 10, the voltages collected by the two adjacent voltage acquisition sub-circuits 20 connected by the voltage acquisition line 10 are both inaccurate, that is, the voltage of the single battery 110 corresponding to the two adjacent voltage acquisition sub-circuits 20 is greatly different from the voltages of other single batteries 110. Therefore, whether the voltage acquisition line 10 connected to the first single battery has a broken line can be determined according to the first voltage of the first single battery, the second voltage of the single battery 110 adjacent to the first single battery, and the set threshold value.

[0110] In one embodiment, the first single battery is the third single battery 110 connected in sequence in the battery pack 1000, and the second single battery is the fourth single battery 110 connected in sequence in the battery pack 1000. According to the comparison result of the first voltage of the first single battery, the second voltage of the second single battery, and the set threshold value, if both the first voltage and the second voltage exceed the suitable range, it can be determined that the voltage acquisition channel 100 connected to the first single battery and the second single battery has a broken line.

[0111] In addition, the voltage acquisition line 10 connected to the negative electrode of the first single battery 110 connected in sequence in the battery pack 1000 is connected to only one voltage acquisition sub-circuit 20, and the voltage acquisition line 10 connected to the positive electrode of the nth single battery 110 connected in sequence in the battery pack 1000 is also connected to only one voltage acquisition sub-circuit 20. In the case of a broken line in the voltage acquisition channel 100 connected to the negative electrode of the first single battery 110, the collected voltages of the first single battery 110 and the second single battery 110 are inaccurate, and therefore whether the voltage acquisition channel 100 connected to the negative electrode of the first single battery 110 has a broken line can be determined according to the collected voltages of the first single battery 110 and the second single battery 110. Similarly, whether the voltage acquisition line 10 connected to the positive electrode of the nth single battery 110 has a broken line can be determined according to the collected voltages of the nth single battery 110 and the (n-1)th single battery 110.

[0112] Thus, in the disconnection detection method, the disconnection detection circuit, the disconnection detection device, the electronic device, the vehicle, and the computer readable storage medium of the embodiments of the present disclosure, when there is a disconnection in the voltage collection channel 100, after the control switch 21 of the voltage collection sub-circuit is closed, the voltage of the two adjacent single batteries 110 will have a larger difference compared with the voltage when there is no disconnection. Therefore, according to the first voltage of the first single battery, the second voltage of the second single battery adjacent to the first single battery, and the set threshold value obtained after the control switch 21 is closed, it can be determined whether the voltage collection channel 100 connected with the first single battery has a disconnection, without using the diagnostic process of the sampling chip 30, and can be used for disconnection detection with various sampling chips 30, and has strong versatility.

[0113] Please refer to FIG. 4, in some embodiments, the battery pack 1000 includes a plurality of single batteries 110 connected in sequence, each single battery 110 corresponds to a voltage collection sub-circuit 20, and step 01 (controlling the control switch 21 of the voltage collection sub-circuit 20 to be closed or disconnected) includes:

[0114] 011: control the control switch 21 of the first sequence voltage collection sub-circuit to be closed, the first sequence voltage collection sub-circuit includes the voltage collection sub-circuit 20 corresponding to the (2k-1) th single battery 110 in the battery pack 1000;

[0115] 012: control the control switch 21 of the second sequence voltage collection sub-circuit to be disconnected, the second sequence voltage collection sub-circuit includes the voltage collection sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the first state, wherein k is an integer greater than or equal to 1;

[0116] Step 02 (obtaining the first voltage of the first single battery and the second voltage of the second single battery) includes:

[0117] 021: obtaining the first voltage of the first single battery in the first state, and the first voltage of the second single battery in the second state.

[0118] In some embodiments, the processor can be configured to control the control switch 21 of the first sequence of voltage acquisition sub-circuits to be closed, the first sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the (2k-1)th single battery 110 in the battery pack 1000; control the control switch 21 of the second sequence of voltage acquisition sub-circuits to be opened, the second sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the first state, wherein k is an integer greater than or equal to 1; and obtain the first voltage of the first single battery in the first state and the second voltage of the second single battery in the first state.

[0119] In some embodiments, the first control module comprises a first control sub-module and a second control sub-module, and the first acquisition module comprises a first acquisition sub-module. The first control sub-module can be configured to control the control switch 21 of the first sequence of voltage acquisition sub-circuits to be closed, the first sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the (2k-1)th single battery 110 in the battery pack 1000; the second control sub-module can be configured to control the control switch 21 of the second sequence of voltage acquisition sub-circuits to be opened, the second sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the first state, wherein k is an integer greater than or equal to 1; and the first acquisition sub-module can be configured to obtain the first voltage of the first single battery in the first state and the second voltage of the second single battery in the first state.

[0120] Specifically, the first sequence of voltage acquisition sub-circuits comprises all voltage acquisition sub-circuits 20 connected to the (2k-1)th single battery 110 in the battery pack 1000, i.e., the first sequence of voltage acquisition sub-circuits comprises all voltage acquisition sub-circuits 20 connected to the single batteries 110 with odd order in the battery pack 1000. The second sequence of voltage acquisition sub-circuits comprises all voltage acquisition sub-circuits 20 connected to the 2kth single battery 110 in the battery pack 1000, i.e., the second sequence of voltage acquisition sub-circuits comprises all voltage acquisition sub-circuits 20 connected to the single batteries 110 with even order in the battery pack 1000. Wherein k is an integer greater than or equal to 1, for example, k is 1, 2, 3, 4 or 5, etc.

[0121] In one embodiment, the battery pack 1000 includes five single batteries 110 connected in sequence, and the first sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the first single battery 110, the voltage acquisition sub-circuit 20 corresponding to the third single battery 110, and the voltage acquisition sub-circuit 20 corresponding to the fifth single battery 110, and the first sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the second single battery 110 and the voltage acquisition sub-circuit 20 corresponding to the fourth single battery 110.

[0122] Simultaneously, the control switch 21 of all the voltage acquisition sub-circuits 20 connected to the single battery 110 with odd order is closed, and the control switch 21 of all the voltage acquisition sub-circuits 20 connected to the single battery 110 with odd order is opened, so that the single battery 110 of the battery pack 1000 is in the first state. At this time, the first voltage Vcello[i] of the first single battery and the second voltage Vcello[i+1] or Vcello[i-1] of the second single battery in the first state are acquired. Since the first single battery can be any single battery 110 in the battery pack 1000, the voltage of all the single batteries 110 of the battery pack 1000 in the first state is acquired to obtain Vcello[n], wherein 0

[0123] In this way, by closing the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with odd order and opening the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with even order, the battery pack 1000 can be in the first state. The voltage of the first single battery and the second single battery in the first state is acquired and compared with the set threshold value, so as to determine whether there is a disconnection in the voltage acquisition line 10 connected to the first single battery.

[0124] Referring to FIG. 5, in some embodiments, the set threshold value includes a first set value and a second set value, the first set value is greater than the second set value, in the case that the first single battery is the 2k-1th single battery 110 and the second single battery is the 2kth single battery 110, the step 03 (determining the disconnection state of the voltage acquisition channel 100 connected to the first single battery according to the first voltage, the second voltage, and the set threshold value) includes:

[0125] 031: In the first state, if the first voltage is less than the second set value and the second voltage is greater than the first set value, it is determined that there is a disconnection in the voltage acquisition line 10 connected to the positive electrode of the first single battery.

[0126] In some embodiments, the processor is configured to determine, in the first state, that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected if the first voltage is less than the second set value and the second voltage is greater than the first set value.

[0127] In some embodiments, the first determining module comprises a first determining sub-module. The first determining sub-module is configured to determine, in the first state, that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected if the first voltage is less than the second set value and the second voltage is greater than the first set value.

[0128] Specifically, the first single battery and the second single battery share one voltage collection line 10 to connect the respective voltage collection sub-circuit 20, and the shared voltage collection line 10 is the target line.

[0129] In the case where the first single battery is the 2k-1th single battery 110 and the second single battery is the 2kth single battery 110, at this time, the second single battery is the single battery 110 arranged after the first single battery, the positive electrode of the first single battery is connected to the negative electrode of the second single battery, and the target line is connected to the positive electrode of the first single battery and the negative electrode of the second single battery.

[0130] Since the voltage collection line 10 connected to the positive electrode of the single battery 110 other than the 1st to the n-1th single battery 110 is connected to two voltage collection sub-circuits 20, when the voltage collection line 10 connected to the positive electrode of the single battery 110 other than the nth single battery 110 is disconnected, the voltage collected by the two voltage collection sub-circuits 20 connected by the voltage collection line 10 will be inaccurate. Therefore, in the case where the first voltage of the first single battery and the second voltage of the second single battery are inaccurate, it can be determined that the target line is disconnected.

[0131] After controlling the control switches 21 of all the voltage collection sub-circuits 20 connected to the single batteries 110 with odd order to be closed and other control switches 21 to be opened, the first voltage Vcello[2k-1] of the first single battery and the second voltage Vcello[2k] of the second single battery at this time are collected.

[0132] The threshold value comprises a first set value and a second set value, wherein the first set value Vmax can be the maximum value of the suitable range of the voltage of the single battery 110, and the second set value Vmin can be the minimum value of the suitable range of the voltage of the single battery 110, and the second set value is less than the first set value.

[0133] In the first state, if the first voltage Vcello[2k-1] is less than the second set value Vmin, and the second voltage Vcello[2k] is greater than the first set value Vmax, i.e. Vcello[2k-1]<Vmin, and Vcello[2k]>Vmax, it is determined that the target line has a disconnection, i.e. it is determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery has a disconnection.

[0134] Thus, in the case that the first single battery is the single battery 110 with an odd order, the second single battery is the single battery 110 with an order one after the first single battery, and both are in the first state, if the first voltage is less than the second set value, and the second voltage is greater than the first set value, it is determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery has a disconnection, i.e. it is determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery and the second single battery has a disconnection.

[0135] In some embodiments, the set threshold value includes a first set value and a second set value, the second set value is less than the first set value, the first set value is determined according to the average single voltage and the voltage drop of the control switch 21, and the second set value is determined according to the voltage drop of the control switch 21.

[0136] Specifically, the average single voltage Vave is the average voltage of the single batteries 110 in the battery pack 1000, which is determined according to the sum of the total voltage of all single batteries 110 divided by the number of all single batteries 110, i.e.

[0137] Wherein, 1≤i≤n. The voltage Vi of the single battery 110 can be obtained by turning off all control switches 21 of the voltage acquisition sub-circuit 20, so that the battery pack 1000 is in the third state, and the voltage of the single battery 110 at this time is acquired.

[0138] In one embodiment, the first set value Vmax is: Vmax=2×Vave-Vnpn

[0139] The second set value Vmin is: Vmin=Vnpn+0.5

[0140] Wherein, Vnpn is the voltage drop of the NPN transistor (control switch 21).

[0141] In some embodiments, the first set value is less than the maximum value of the normal preset voltage range of the single battery 110. In one embodiment, the normal preset voltage range of the single battery 110 is [2000, 4500], and the first set value Vmax<4500V.

[0142] Thus, the first set value can be determined according to the average of the single cell voltages and the voltage drop of the control switch 21, and the second set value can be determined according to the voltage drop of the control switch 21.

[0143] Referring to FIG. 6, in some embodiments, the set threshold value includes a first set value and a second set value, the first set value is greater than the second set value, in the case that the first single cell is the 2kth single cell 110 and the second single cell is the 2k+1th single cell 110, the step 03 (determining the disconnection state of the voltage acquisition channel 100 connected with the first single cell according to the first voltage, the second voltage and the set threshold value) includes:

[0144] 032: in the first state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, it is determined that the voltage acquisition line 10 connected with the positive electrode of the first single cell exists disconnection.

[0145] In some embodiments, the processor can be configured to, in the first state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, determine that the voltage acquisition line 10 connected with the positive electrode of the first single cell exists disconnection.

[0146] In some embodiments, the first determining module includes a second determining submodule. The second determining submodule can be configured to, in the first state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, determine that the voltage acquisition line 10 connected with the positive electrode of the first single cell exists disconnection.

[0147] Specifically, in the case that the first single cell is the 2kth single cell 110 and the second single cell is the 2k+1th single cell 110, at this time, the first single cell is the single cell 110 with even connection order in the battery pack 1000, the second single cell is the single cell 110 connected after the first single cell in the battery pack 1000, the positive electrode of the first single cell is connected with the negative electrode of the second single cell, and the target line shared by the first single cell and the second single cell is connected with the positive electrode of the first single cell and the negative electrode of the second single cell.

[0148] After the control switches 21 of all the voltage acquisition sub-circuits 20 connected with the single cells 110 with odd connection order are closed and the other control switches 21 are disconnected, the first voltage Vcello[2k] of the first single cell and the second voltage Vcello[2k+1] of the second single cell at this time are acquired.

[0149] If the first voltage Vcello[2k] is greater than the first set value Vmax and the second voltage Vcello[2k+1] is less than the second set value Vmin, i.e. Vcello[2k] > Vmax and Vcello[2k+1] < Vmin, it is determined that the target line is disconnected, i.e. it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected.

[0150] Thus, in the case that the first single battery is the single battery 110 with an even order, the second single battery is the single battery 110 with an order one after the first single battery, and both are in the first state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, it can be determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected, i.e. it can be determined that the voltage collection line 10 connected to the first single battery and the second single battery is disconnected.

[0151] Referring to FIG. 7, in some embodiments, the battery pack 1000 includes a plurality of single batteries 110 connected in sequence, each single battery 110 corresponds to a voltage collection sub-circuit 20, and step 01 (controlling the control switch 21 of the voltage collection sub-circuit 20 to be closed or disconnected) includes:

[0152] 013: controlling the control switch 21 of the first sequence voltage collection sub-circuit to be disconnected, the first sequence voltage collection sub-circuit including the voltage collection sub-circuit 20 corresponding to the 2k-1th single battery 110 in the battery pack 1000;

[0153] 014: controlling the control switch 21 of the second sequence voltage collection sub-circuit to be closed, the second sequence voltage collection sub-circuit including the voltage collection sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the second state, wherein k is an integer greater than or equal to 1;

[0154] Step 02 (obtaining the first voltage of the first single battery and the second voltage of the second single battery) includes:

[0155] 022: obtaining the first voltage of the first single battery in the second state and the second voltage of the second single battery in the second state.

[0156] In some embodiments, the processor can be configured to control the control switch 21 of the first sequence of voltage acquisition sub-circuits to be open, the first sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the (2k-1)th single battery 110 in the battery pack 1000; control the control switch 21 of the second sequence of voltage acquisition sub-circuits to be closed, the second sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the second state, wherein k is an integer greater than or equal to 1; and obtain the first voltage of the first single battery and the second voltage of the second single battery in the second state.

[0157] In some embodiments, the first control module comprises a third control sub-module and a fourth control sub-module, and the first acquisition module comprises a second acquisition sub-module. The third control sub-module can be configured to control the control switch 21 of the first sequence of voltage acquisition sub-circuits to be open, the first sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the (2k-1)th single battery 110 in the battery pack 1000; the fourth control sub-module can be configured to control the control switch 21 of the second sequence of voltage acquisition sub-circuits to be closed, the second sequence of voltage acquisition sub-circuits comprising the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000, so that the battery pack 1000 is in the second state, wherein k is an integer greater than or equal to 1; and the second acquisition sub-module can be configured to obtain the first voltage of the first single battery and the second voltage of the second single battery in the second state.

[0158] Specifically, the control switch 21 of the first sequence of voltage acquisition sub-circuits is controlled to be open, and the control switch 21 of the second sequence of voltage acquisition sub-circuits is controlled to be closed, i.e., the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with an odd order in the battery pack 1000 is controlled to be open, and the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with an even order in the battery pack 1000 is controlled to be closed, so that the battery pack 1000 is in the second state.

[0159] In the case where the battery pack 1000 is in the second state, the first voltage of the first single battery and the second voltage of the second single battery are acquired. As mentioned above, if there is a broken wire in the target line, the first voltage and the second voltage will exceed the appropriate voltage range, and therefore, according to the first voltage, the second voltage acquired at this time and the set threshold value, it can be determined whether there is a broken wire in the voltage acquisition line 10 connected to the first single battery.

[0160] Thus, by controlling the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the monomer battery 110 with an even order to be closed and controlling the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the monomer battery 110 with an odd order to be opened, the battery pack 1000 can be in the second state. The voltage of the first monomer battery and the second monomer battery in the second state is acquired and compared with the set threshold value, so as to determine whether the voltage acquisition line 10 connected with the first monomer battery exists a disconnection.

[0161] Please refer to FIG. 8. In some embodiments, the set threshold value includes a first set value and a second set value. In the case that the first monomer battery is the 2kth monomer battery 110 and the second monomer battery is the 2k+1th monomer battery 110, the step 03 (determining the disconnection state of the voltage acquisition channel 100 connected with the first monomer battery according to the first voltage, the second voltage and the set threshold value) includes:

[0162] 033: In the second state, if the first voltage is less than the second set value and the second voltage is greater than the first set value, it is determined that the voltage acquisition line 10 connected with the positive electrode of the first monomer battery exists a disconnection.

[0163] In some embodiments, the processor can be configured to determine that the voltage acquisition line 10 connected with the positive electrode of the first monomer battery exists a disconnection in the second state if the first voltage is less than the second set value and the second voltage is greater than the first set value.

[0164] In some embodiments, the first determining module includes a third determining sub-module. The third determining sub-module can be configured to determine that the voltage acquisition line 10 connected with the positive electrode of the first monomer battery exists a disconnection in the second state if the first voltage is less than the second set value and the second voltage is greater than the first set value.

[0165] Specifically, in the case that the first monomer battery is the 2kth monomer battery 110, the second monomer battery is the 2k+1th monomer battery 110, and the battery pack 1000 is in the second state, the first voltage Vcelle[2k] of the first monomer battery and the second voltage Vcelle[2k+1] of the second monomer battery at this time are acquired.

[0166] In the case that the battery pack 1000 is in the second state, if the first voltage Vcelle[2k] is less than the second set value Vmin and the second voltage Vcelle[2k+1] is greater than the first set value Vmax, i.e., Vcelle[2k]<Vmin and Vcelle[2k+1]>Vmax, it is determined that the target line exists a disconnection, i.e., it is determined that the voltage acquisition line 10 connected with the positive electrode of the first monomer battery exists a disconnection.

[0167] Thus, in the case that the first monomer battery is the monomer battery 110 with even order, the second monomer battery is the monomer battery 110 with order one after the first monomer battery, and both are in the second state, if the first voltage is less than the second set value, and the second voltage is greater than the first set value, it can be determined that the voltage collection line 10 connected to the positive electrode of the first monomer battery has a broken line, that is, it can be determined that the voltage collection line 10 connected to the first monomer battery and the second monomer battery has a broken line.

[0168] Referring to FIG. 9, in some embodiments, the set threshold value includes a first set value and a second set value, and in the case that the first monomer battery is the 2k-1th monomer battery 110 and the second monomer battery is the 2kth monomer battery 110, the step 03 (determining the broken line state of the voltage collection channel 100 connected to the first monomer battery according to the first voltage, the second voltage and the set threshold value) includes:

[0169] 034: In the second state, if the first voltage is greater than the first set value, and the second voltage is less than the second set value, it is determined that the voltage collection line 10 connected to the positive electrode of the first monomer battery has a broken line.

[0170] In some embodiments, the processor can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first monomer battery has a broken line in the second state if the first voltage is greater than the first set value and the second voltage is less than the second set value.

[0171] In some embodiments, the first determining module includes a fourth determining sub-module. The fourth determining sub-module can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first monomer battery has a broken line in the second state if the first voltage is greater than the first set value and the second voltage is less than the second set value.

[0172] Specifically, in the case that the first monomer battery is the 2k-1th monomer battery 110, the second monomer battery is the 2kth monomer battery 110, and the battery pack 1000 is in the second state, the first voltage Vcelle[2k-1] of the first monomer battery and the second voltage Vcelle[2k] of the second monomer battery at this time are collected.

[0173] In the case that the battery pack 1000 is in the second state, if the first voltage Vcelle[2k-1] is greater than the first set value Vmax, and the second voltage Vcelle[2k] is less than the second set value Vmin, that is, Vcelle[2k-1]>Vmax, and Vcelle[2k]<Vmin, it is determined that the target line has a broken line, that is, it is determined that the voltage collection line 10 connected to the positive electrode of the first monomer battery has a broken line.

[0174] Thus, in the case that the first single battery is the single battery 110 with odd order, the second single battery is the single battery 110 with order one after the first single battery, and both are in the second state, if the first voltage is greater than the first set value and the second voltage is less than the second set value, it can be determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected, that is, the voltage collection line 10 connected to the first single battery and the second single battery is disconnected.

[0175] Referring to FIG. 10, in some embodiments, the disconnection detection method further comprises:

[0176] 04: controlling the control switch 21 of all voltage collection sub-circuits 20 to be disconnected, so that the battery pack 1000 is in the third state;

[0177] Step 02 (obtaining the first voltage of the first single battery and the second voltage of the second single battery) comprises:

[0178] 023: obtaining the first voltage of the first single battery in the third state and the second voltage of the second single battery in the third state.

[0179] In some embodiments, the processor can be configured to control the control switch 21 of all voltage collection sub-circuits 20 to be disconnected, so that the battery pack 1000 is in the third state; and can be configured to obtain the first voltage of the first single battery in the third state and the second voltage of the second single battery in the third state.

[0180] In some embodiments, the disconnection detection device further comprises a second control module, and the first acquisition module further comprises a third acquisition sub-module. Wherein, the second control module can be configured to control the control switch 21 of all voltage collection sub-circuits 20 to be disconnected, so that the battery pack 1000 is in the third state; and the third acquisition sub-module can be configured to obtain the first voltage of the first single battery in the third state and the second voltage of the second single battery in the third state.

[0181] Specifically, the sampling chip 30 controls the control switch 21 of all voltage collection sub-circuits 20 to be disconnected, so that the battery pack 1000 is in the third state, and collects the first voltage of the first single battery and the second voltage of the second single battery at this time. According to the first voltage, the second voltage and the set threshold value at this time, it can be determined whether the voltage collection line 10 connected to the first single battery is disconnected.

[0182] When the battery pack 1000 is in the first state or the second state, the disconnection of the voltage collection lines 10 cannot be accurately determined according to the first voltage, the second voltage and the set threshold value. For example, the disconnection of multiple voltage collection lines 10 cannot be checked according to the first voltage, the second voltage and the set threshold value in the first state or the second state. Therefore, the first voltage, the second voltage and the set threshold value in the third state can be determined again to determine the disconnection of the voltage collection lines 10 by multiple methods.

[0183] In this way, the battery pack 1000 can be in the third state by disconnecting all the control switches 21. The first voltage and the second voltage at this time can be collected, and the disconnection of the voltage collection lines 10 can be determined according to the first voltage, the second voltage and the set threshold value.

[0184] Referring to FIG. 11, in some embodiments, the battery pack includes multiple single batteries connected in sequence. In the battery pack, the second single battery is the previous single battery or the next single battery of the first single battery. The set threshold value includes a first voltage threshold value with a positive value and a second voltage threshold value with a negative value. Step 03 (determining the disconnection state of the voltage collection line 10 connected to the first single battery according to the first voltage, the second voltage and the set threshold value) includes:

[0185] 035: In the third state, if the target difference value of the first voltage is greater than the first voltage threshold value, and the target difference value of the second voltage is less than the second voltage threshold value, it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected. The target difference value is the difference between the average single battery voltage and the voltage.

[0186] In some embodiments, the processor can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected in the third state if the target difference value of the first voltage is greater than the first voltage threshold value, and the target difference value of the second voltage is less than the second voltage threshold value. The target difference value is the difference between the average single battery voltage and the voltage.

[0187] In some embodiments, the first determining module includes a fifth determining sub-module. The fifth determining sub-module can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected in the third state if the target difference value of the first voltage is greater than the first voltage threshold value, and the target difference value of the second voltage is less than the second voltage threshold value. The target difference value is the difference between the average single battery voltage and the voltage.

[0188] Specifically, the first single battery is the i-th single battery 110 in the battery pack 1000, and the second single battery is the single battery 110 in the battery pack 1000 which is in front of the first single battery in order or the single battery 110 which is behind the first single battery in order, i.e., the second single battery is the i-1-th single battery 110 in the battery pack 1000 or the i+1-th single battery 110 in the battery pack 1000. In the third state, the first voltage Vcell[i] of the first single battery and the second voltage (Vcell[i-1] or Vcell[i+1]) of the second single battery are collected.

[0189] The first voltage threshold Vdiff and the second voltage threshold -Vdiff are preset voltage values, the absolute values of the first voltage threshold and the second voltage threshold are equal, the first voltage threshold is a positive value, and the second voltage threshold is a negative value, which can be set according to actual needs.

[0190] The target difference is the difference between the average single battery voltage Vave and the voltage Vcell, i.e., Vave-Vcell. The target difference of the first voltage is Vave-Vcell[i], and the target difference of the second voltage is Vave-Vcell[i-1] or Vave-Vcell[i+1]. When the target difference of the first voltage is greater than the first voltage threshold Vdiff, and the target difference of the second voltage is less than the second voltage threshold -Vdiff, i.e., Vave-Vcell[i]>Vdiff and Vave-Vcell[i-1]<-Vdiff, or Vave-Vcell[i]>Vdiff and Vave-Vcell[i+1]<-Vdiff, it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected.

[0191] In this way, when the battery pack 1000 is in the third state, if the target difference of the first voltage is greater than the first voltage threshold, and the target difference of the second voltage is less than the second voltage threshold, it can be determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected, i.e., it can be determined that the voltage collection line 10 connected to the first single battery and the second single battery is disconnected.

[0192] Referring to FIG. 12, in some embodiments, the battery pack includes a plurality of single batteries connected in sequence, in the battery pack, the second single battery is the single battery in front of the first single battery in order or the single battery behind the first single battery in order, the set threshold includes the first voltage threshold which is a positive value and the second voltage threshold which is a negative value, and step 03 (determining the disconnection state of the voltage collection line 10 connected to the first single battery according to the first voltage, the second voltage, and the set threshold) includes:

[0193] 036: In the third state, if the target difference value of the first voltage is less than the second voltage threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery has a disconnection, and the target difference value is the difference between the single voltage average and the voltage.

[0194] In some embodiments, the processor can be configured to, in the third state, if the target difference value of the first voltage is less than the second voltage threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, determine that the voltage collection line 10 connected to the positive electrode of the first single battery has a disconnection, and the target difference value is the difference between the single voltage average and the voltage.

[0195] In some embodiments, the first determining module comprises a sixth determining sub-module. The sixth determining sub-module can be configured to, in the third state, if the target difference value of the first voltage is less than the second voltage threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, determine that the voltage collection line 10 connected to the positive electrode of the first single battery has a disconnection, and the target difference value is the difference between the single voltage average and the voltage.

[0196] Specifically, the first single battery is the i-th single battery 110 in the battery pack 1000, and the second single battery is the single battery 110 in the battery pack 1000 which is in order before the first single battery or after the first single battery, i.e., the second single battery is the i-1-th single battery 110 or the i+1-th single battery 110 in the battery pack 1000. In the third state, the first voltage Vcell[i] of the first single battery and the second voltage Vcell[i-1] of the second single battery are collected.

[0197] When the target difference value of the first voltage is less than the second voltage threshold value -Vdiff, and the target difference value of the second voltage is greater than the first voltage threshold value Vdiff, i.e., Vave-Vcell[i]<-Vdiff and Vave-Vcell[i-1]>Vdiff, or Vave-Vcell[i]<-Vdiff and Vave-Vcell[i+1]>Vdiff, it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery has a disconnection.

[0198] In one embodiment, Vave-Vcell[2]<-Vdiff and Vave-Vcell[1]>Vdiff, it can be determined that the voltage collection line 10 connected to the positive electrode of the second single battery 110 has a disconnection.

[0199] Thus, in the case that the battery pack 1000 is in the third state, if the target difference value of the first voltage is greater than the first voltage threshold value, and the target difference value of the second voltage is less than the second voltage threshold value, it can be determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected, i.e., it can be determined that the voltage collection line 10 connected to the first single battery and the second single battery is disconnected.

[0200] Referring to FIG. 13, in some embodiments, the battery pack 1000 includes a plurality of single batteries 110 connected in sequence, the threshold value includes a first voltage threshold value and a second threshold value, the first single battery is the first single battery 110 in the battery pack 1000, and the second single battery is the second single battery 110 in the battery pack 1000. In the case that the first single battery is the first single battery 110 in the battery pack 1000, and the second single battery is the second single battery 110 in the battery pack 1000, step 03 (determining the disconnection state of the voltage collection channel 100 connected to the first single battery according to the first voltage, the second voltage, and the threshold value) includes:

[0201] 037: In the case that the first voltage is less than the second threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage collection line 10 connected to the negative electrode of the first single battery is disconnected, and the target difference value is the difference between the average single voltage and the voltage.

[0202] In some embodiments, the processor can be configured to determine that the voltage collection line 10 connected to the negative electrode of the first single battery is disconnected in the case that the first voltage is less than the second threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, and the target difference value is the difference between the average single voltage and the voltage.

[0203] In some embodiments, the first determining module includes a seventh determining submodule. The seventh determining submodule can be configured to determine that the voltage collection line 10 connected to the negative electrode of the first single battery is disconnected in the case that the first voltage is less than the second threshold value, and the target difference value of the second voltage is greater than the first voltage threshold value, and the target difference value is the difference between the average single voltage and the voltage.

[0204] Specifically, the first single battery is the first single battery 110 in the battery pack 1000, and the second single battery is the second single battery 110 in the battery pack 1000. In the third state, the first voltage Vcell[1] of the first single battery and the second voltage Vcell[2] of the second single battery are collected.

[0205] In the case that the first voltage is less than the second threshold value Vmin, and the target difference value of the second voltage is greater than the first voltage threshold value Vdiff, i.e., Vcell[1] < Vmin, Vave-Vcell[2] > Vdiff, it is determined that the voltage collection line 10 connected to the negative electrode (V1-) of the first single battery is disconnected.

[0206] Thus, in the case that the battery pack 1000 is in the third state, if the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold, it can be determined that the voltage collection line 10 connected to the negative electrode of the first single battery 110 in the battery pack 1000 is disconnected.

[0207] Referring to FIG. 14, in some embodiments, the battery pack 1000 includes m single batteries 110 connected in sequence, the set threshold includes a second set value and a first voltage threshold which is a positive value, in the case that the first single battery is the mth single battery 110 in the battery pack 1000, and the second single battery is the m-1th single battery 110 in the battery pack 1000, the step 03 (determining the disconnection state of the voltage collection channel 100 connected to the first single battery according to the first voltage, the second voltage and the set threshold) includes:

[0208] 038: in the case that the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold, it is determined that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected, the target difference value is the difference between the average single voltage and the voltage, wherein m is a positive integer greater than 1.

[0209] In some embodiments, the processor can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected in the case that the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold, the target difference value is the difference between the average single voltage and the voltage.

[0210] In some embodiments, the first determining module includes an eighth determining sub-module. The eighth determining sub-module can be configured to determine that the voltage collection line 10 connected to the positive electrode of the first single battery is disconnected in the case that the first voltage is less than the second set value, and the target difference value of the second voltage is greater than the first voltage threshold, the target difference value is the difference between the average single voltage and the voltage.

[0211] Specifically, the first single battery is the mth single battery 110 in the m single batteries 110 of the battery pack 1000, and the second single battery is the m-1th single battery 110 in the battery pack 1000. That is, the second single battery is the single battery 110 connected before the first single battery. The voltage collection line 10 connected to the positive electrode of the first single battery is only connected to the first single battery 110.

[0212] In the third state, the first voltage Vcell[m] of the first single battery and the second voltage Vcell[m-1] of the second single battery are collected.

[0213] In the case that the first voltage is less than the second set value Vmin and the target difference value of the second voltage is greater than the first voltage threshold Vdiff, i.e. in the case that Vcell[m]<Vmin, Vave-Vcell[m-1]>Vdiff, it is determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery is disconnected.

[0214] In some embodiments, the first single battery is the Nth single battery 110 in the N single batteries 110 connected to one sampling chip, and the second single battery is the (N-1)th single battery 110 connected to the same sampling chip. In the case that Vcell[n]<Vmin, Vave-Vcell[n-1]>Vdiff, it is determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery is disconnected.

[0215] In one embodiment, referring to FIG. 2, one sampling chip (AFE) samples the voltage of 16 single batteries 110, and the first single battery is B16. In the case that Vcell

[0016] <Vmin, Vave-Vcell

[0015] >Vdiff, it is determined that the voltage acquisition line 10 connected to the positive electrode V16+ of B16 is disconnected.

[0216] Thus, in the case that the battery pack 1000 is in the third state, if the first voltage is less than the second set value and the target difference value of the second voltage is greater than the first voltage threshold, it can be determined that the voltage acquisition line 10 connected to the positive electrode of the first single battery 110 in the battery pack 1000 is disconnected.

[0217] Referring to FIG. 15, in some embodiments, the battery pack 1000 includes a plurality of single batteries 110 connected in sequence, and in the case that it is determined that all the voltage acquisition lines 10 are not disconnected, the disconnection detection method further includes:

[0218] 05: controlling the control switch 21 of the first sequence voltage acquisition sub-circuit to be closed and the control switch 21 of the second sequence voltage acquisition sub-circuit to be opened, wherein the first sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the (2k-1)th single battery 110 in the battery pack 1000, and the second sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000;

[0219] 06: obtaining the third voltage of the 2k-1th single battery 110 in the battery pack 1000;

[0220] 07: determining, according to the third voltage and the first target current, the line resistance state of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000, wherein k is an integer greater than or equal to 1, the first target current is determined according to the voltage or the average voltage of the 2k-1th single battery 110 in the third state, and all the control switches 21 are open in the case that the battery pack 1000 is in the third state.

[0221] In some embodiments, the processor can be configured to control the control switch 21 of the first sequence voltage collection sub-circuit to be closed and the control switch 21 of the second sequence voltage collection sub-circuit to be open, configured to obtain the third voltage of the 2k-1th single battery 110 in the battery pack 1000, configured to determine the first target current according to the third voltage, and configured to determine, according to the third voltage and the first target current, the line resistance state of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000, wherein k is an integer greater than or equal to 1.

[0222] In some embodiments, the line break detection device further comprises a third control module, a second obtaining module, a second determining module and a third determining module. The third control module can be configured to control the control switch 21 of the first sequence voltage collection sub-circuit to be closed and the control switch 21 of the second sequence voltage collection sub-circuit to be open, the second obtaining module can be configured to obtain the third voltage of the 2k-1th single battery 110 in the battery pack 1000, the second determining module can be configured to determine the first target current according to the third voltage, and the third determining module can be configured to determine, according to the third voltage and the first target current, the line resistance state of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000, wherein k is an integer greater than or equal to 1.

[0223] Specifically, the voltage collection sub-circuit 20 of the embodiments of the present disclosure can also be used to detect whether the line resistance of the voltage collection line 10 is too large. In the case that it is determined that all the voltage collection lines 10 have line breaks, it is detected whether the voltage collection line 10 has the problem of too large line resistance.

[0224] The control switch 21 of the voltage collection sub-circuit 20 corresponding to all the single batteries 110 with odd order can be controlled to be closed, the control switch 21 of the voltage collection sub-circuit 20 corresponding to all the single batteries 110 with even order can be controlled to be open, and the voltage of the single battery 110 with odd order at this time can be obtained as the third voltage Vcelle1.

[0225] The first target current can be determined according to the voltage or the average voltage of the 2k-1th single battery 110 when all the control switches 21 are open (the battery pack is in the third state), and whether the line resistance of the voltage collection line 10 connected to the odd-numbered single battery 110 can be determined according to the determined first target current and the third voltage.

[0226] In this way, by closing the control switches 21 of the voltage collection sub-circuits 20 corresponding to all the single batteries 110 with odd order, the line resistance state of the voltage collection line 10 connected to all the single batteries 110 with odd order can be detected.

[0227] Referring to FIG. 16, in some embodiments, the voltage collection sub-circuit 20 includes a plurality of resistors, and when the control switch 21 of the voltage collection sub-circuit 20 is closed, the resistors, the single battery 110 and the control switch 21 form a first target loop, the first target current is the current in the first target loop, and step 07 (determining the line resistance state of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000 according to the third voltage and the first target current) includes:

[0228] 071: determining a first reference voltage according to the first target current, the internal resistance of the control switch 21 and the resistance value of the resistor;

[0229] 072: determining that the line resistance of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000 is too large when the third voltage is less than the first reference voltage.

[0230] In some embodiments, the processor can be configured to determine a first reference voltage according to the first target current, the internal resistance of the control switch 21 and the resistance value of the resistor, and to determine that the line resistance of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000 is too large when the third voltage is less than the first reference voltage.

[0231] In some embodiments, the third determining module includes a ninth determining sub-module and a tenth determining sub-module. The ninth determining sub-module can be configured to determine a first reference voltage according to the first target current, the internal resistance of the control switch 21 and the resistance value of the resistor, and the tenth determining sub-module can be configured to determine that the line resistance of the voltage collection line 10 connected to the 2k-1th single battery 110 in the battery pack 1000 is too large when the third voltage is less than the first reference voltage.

[0232] Specifically, the resistors of the voltage acquisition circuit include detection resistors and a pull-down resistor 24, wherein one voltage acquisition circuit includes a first detection resistor 22, a second detection resistor 23 and one pull-down resistor 24. One end of the first detection resistor 22 is connected to the positive electrode of the single battery 110 corresponding to the voltage acquisition circuit, the other end of the first detection resistor 22 is connected to one end of the pull-down resistor 24, and the other end of the pull-down resistor 24 is connected to the control switch 21. One end of the second detection resistor 23 is connected to the negative electrode of the single battery 110 corresponding to the voltage acquisition circuit, and the other end of the second detection resistor 23 is connected to the control switch 21.

[0233] In the case that the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with odd number is closed, the first detection resistor 22, the second detection resistor 23 and the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the single battery 110 with odd number form a first target loop, and the first target current is the current flowing through the first target loop.

[0234] According to the voltage Vcell of the single battery in the third state or the average value Vave of the single voltage, the resistance value R1 of the first detection resistor 22 2k-1 , the resistance value R2 of the second detection resistor 23 2k-1 , the resistance value of the pull-down resistor 24 R3 2k-1 and the internal resistance of the control switch 21 , the first target current

[0235] or the first target current is:

[0236] According to the first target current, the internal resistance R of the control switch 21 NPN and the resistance value R3 of the pull-down resistor 24 2k-1 , the first reference voltage

[0237] wherein Vadc is a preset sampling voltage error.

[0238] The first reference voltage is the voltage between the connection node of the pull-down resistor 24 and the control switch 21 and the two detection resistors. When the first target loop is formed, if the line resistance of the voltage sampling line is too large, the third voltage obtained by sampling will be small. If the third voltage is smaller than the first reference voltage, it can be considered that the third voltage is too small. Therefore, when the third voltage is smaller than the first reference voltage , that is, Vcelle1[2k-1]< In the case where the third voltage is less than the first reference voltage, it is determined that the line resistance of the voltage collection line 10 connected to the (2k-1)th monomer battery 110 in the battery pack 1000 is too large.

[0239] In this way, the first reference voltage can be determined according to the first target current and the resistance value of the internal resistance and the resistor of the control switch 21, and in the case where the third voltage is less than the first reference voltage, it is determined that the line resistance of the voltage collection line 10 connected to the monomer battery 110 with an odd order in the battery pack 1000 is too large.

[0240] Referring to FIG. 17, in some embodiments, the battery pack 1000 includes a plurality of monomer batteries 110 connected in sequence, and in the case where it is determined that there is no disconnection in all voltage collection lines 10, the disconnection detection method further includes:

[0241] 08: controlling the control switch 21 of the first sequence voltage collection sub-circuit to be open and controlling the control switch 21 of the second sequence voltage collection sub-circuit to be closed, the first sequence voltage collection sub-circuit including the voltage collection sub-circuit 20 corresponding to the (2k-1)th monomer battery 110 in the battery pack 1000, and the second sequence voltage collection sub-circuit including the voltage collection sub-circuit 20 corresponding to the (2k)th monomer battery 110 in the battery pack 1000;

[0242] 09: obtaining a fourth voltage of the (2k)th monomer battery 110 in the battery pack 1000;

[0243] 0110: determining the line resistance state of the voltage collection line 10 connected to the (2k)th monomer battery 110 in the battery pack 1000 according to the fourth voltage and a second target current, wherein k is an integer greater than or equal to 1, and the second target current is determined according to the voltage of the (2k)th monomer battery 110 in the third state or the average monomer voltage, and in the case where the battery pack 1000 is in the third state, all control switches 21 are open.

[0244] In some embodiments, the processor can be configured to control the control switch 21 of the second sequence voltage collection sub-circuit to be closed, the second sequence voltage collection sub-circuit including the voltage collection sub-circuit 20 corresponding to the (2k)th monomer battery 110 in the battery pack 1000; can be configured to obtain a fourth voltage of the (2k)th monomer battery 110 in the battery pack 1000; can be configured to determine a second target current according to the fourth voltage; and can be configured to determine the line resistance state of the voltage collection line 10 connected to the (2k)th monomer battery 110 in the battery pack 1000 according to the fourth voltage and the second target current, wherein k is an integer greater than or equal to 1.

[0245] In some embodiments, the disconnection detection device further comprises a fourth control module, a third acquisition module, a fourth determination module and a fifth determination module. The fourth control module is configured to control the closing of the control switch 21 of the second sequence voltage acquisition sub-circuit, the second sequence voltage acquisition sub-circuit comprises the voltage acquisition sub-circuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000; the third acquisition module is configured to acquire the fourth voltage of the 2kth single battery 110 in the battery pack 1000; the fourth determination module is configured to determine the second target current according to the fourth voltage; and the fifth determination module is configured to determine the line resistance state of the voltage acquisition line 10 connected to the 2kth single battery 110 in the battery pack 1000 according to the fourth voltage and the second target current, wherein k is an integer greater than or equal to 1.

[0246] Specifically, the control switch 21 of all voltage acquisition sub-circuits 20 corresponding to the single battery 110 with even order is closed, the control switch 21 of all voltage acquisition sub-circuits 20 corresponding to the single battery 110 with odd order is opened, and the voltage of the single battery 110 with even order at this time is acquired as the fourth voltage Vcell e1.

[0247] The second target current can be determined according to the voltage or the average voltage of the 2kth single battery 110 under the condition that all control switches 21 are opened (the battery pack is in the third state), and whether the line resistance of the voltage acquisition line 10 connected to the single battery 110 with even order is too large can be determined according to the determined second target current and the fourth voltage.

[0248] In this way, by closing the control switch 21 of all voltage acquisition sub-circuits 20 corresponding to the single battery 110 with even order, the line resistance state of the voltage acquisition line 10 connected to the single battery 110 with even order can be detected.

[0249] Referring to FIG. 18, in some embodiments, the voltage acquisition sub-circuit 20 comprises a plurality of resistors, and under the condition that the control switch 21 of the voltage acquisition sub-circuit 20 is closed, the resistors, the single battery 110 and the control switch 21 form a second target loop, the second target current is the current in the second target loop, and step 0110 (determining the line resistance state of the voltage acquisition line 10 connected to the 2kth single battery 110 in the battery pack 1000 according to the fourth voltage and the second target current) comprises:

[0250] 01101: determining a second reference voltage according to the second target current, the internal resistance of the control switch 21 and the resistance value of the resistor;

[0251] 01102: in the case where the fourth voltage is less than the second reference voltage, determining that the line resistance of the voltage acquisition line 10 connected to the 2kth single battery 110 in the battery pack 1000 is too large.

[0252] In some embodiments, the processor can be configured to determine the second reference voltage according to the second target current, the resistance of the control switch 21 and the resistance of the resistor; and determine that the line resistance of the voltage collection line 10 connected to the 2kth single battery 110 in the battery pack 1000 is too large when the fourth voltage is less than the second reference voltage.

[0253] In some embodiments, the fifth determining module comprises an eleventh determining sub-module and a twelfth determining sub-module. The eleventh determining sub-module can be configured to determine the second reference voltage according to the second target current, the resistance of the control switch 21 and the resistance of the resistor; and the twelfth determining sub-module can be configured to determine that the line resistance of the voltage collection line 10 connected to the 2kth single battery 110 in the battery pack 1000 is too large when the fourth voltage is less than the second reference voltage.

[0254] Specifically, when the control switch 21 of the voltage collection sub-circuit 20 corresponding to the even-numbered single battery 110 is closed, the first detection resistor 22, the second detection resistor 23 and the control switch 21 of the voltage collection sub-circuit 20 corresponding to the even-numbered single battery 110 form a second target loop, and the second target current is the current flowing through the second target loop.

[0255] According to the voltage Vcell of the single battery in the third state or the average voltage Vave of the single battery, the resistance value R1 of the first detection resistor 22 2k-1 , the resistance value R1 of the first detection resistor 22 2k , the resistance value R2 of the second detection resistor 23 2k , the resistance value of the pull-down resistor 24 R3 2k and the internal resistance of the control switch 21 , the first target current

[0256] , or the second target current is:

[0257] According to the second target current, the internal resistance of the control switch 21 and the resistance value R3 of the pull-down resistor 24 2k , the first reference voltage

[0258] , wherein Vadc is a preset sampling voltage error.

[0259] The second reference voltage is the voltage between the pull-down resistor 24 and the connection node of the control switch 21 and the two detection resistors. When the second target loop is formed, if the line resistance of the voltage sampling circuit is too large, the fourth voltage collected will be small. If the fourth voltage is smaller than the second reference voltage, it can be considered that the fourth voltage is too small. Therefore, in the case where the fourth voltage is smaller than the second reference voltage ,the line resistance of the voltage sampling circuit 10 connected to the 2kth single battery 110 in the battery pack 1000 is determined to be too large.

[0260] In this way, the second reference voltage can be determined according to the second target current, the internal resistance of the control switch 21, and the resistance value of the resistor. In the case where the fourth voltage is smaller than the second reference voltage, it can be determined that the line resistance of the voltage sampling circuit 10 connected to the single battery 110 with an even order in the battery pack 1000 is too large.

[0261] Referring to FIG. 19, in some embodiments, the disconnection detection method further includes:

[0262] 0120: obtaining the average single voltage of all single batteries 110;

[0263] 0130: in the case where the average single voltage is within the preset voltage range, determining to perform disconnection detection to determine the disconnection state of the voltage sampling channel 100;

[0264] 0140: in the case where the average single voltage is outside the preset voltage range, determining not to perform disconnection detection.

[0265] In some embodiments, the processor can be configured to obtain the average single voltage of all single batteries 110, and in the case where the average single voltage is within the preset voltage range, determine to perform disconnection detection to determine the disconnection state of the voltage sampling circuit 10, and in the case where the average single voltage is outside the preset voltage range, determine not to perform disconnection detection.

[0266] In some embodiments, the disconnection detection device further includes a fourth acquisition module, a sixth determination module, and a seventh determination module. The fourth acquisition module can be configured to obtain the average single voltage of all single batteries 110, the sixth determination module can be configured to determine to perform disconnection detection to determine the disconnection state of the voltage sampling circuit 10 in the case where the average single voltage is within the preset voltage range, and the seventh determination module can be configured to determine not to perform disconnection detection in the case where the average single voltage is outside the preset voltage range.

[0267] Specifically, if the average of the single voltages of all the single batteries 110 is not within the preset voltage range, it can be considered that the single battery 110 is not in a normal working state. Since the determination of the threshold value is related to the preset voltage range, if the average of the single voltages of the single battery 110 is not within the preset voltage range, the disconnection state judgment according to the voltage of the single battery 110 at this time and the threshold value is not accurate. The average of the single voltages can be determined according to the voltage of the single battery 110 in the third state.

[0268] Therefore, only when the average of the single voltages is within the preset voltage range, it is determined that the disconnection detection of the voltage acquisition circuit 10 can be performed to determine the disconnection state of the voltage acquisition circuit 10. In the case where the average of the single voltages is outside the preset voltage range, at this time the single battery 110 is not in a normal state, it is determined not to perform disconnection detection on the voltage acquisition circuit 10.

[0269] The preset voltage range is the voltage value range of the single battery 110 in the normal working state, which can be determined according to the actual situation or type of the single battery 110.

[0270] In one embodiment, the preset voltage range is [2000, 4500].

[0271] In this way, according to the comparison result of the average of the single voltages and the preset voltage range, it can be determined whether to perform disconnection state detection.

[0272] The disconnection detection circuit 2000 of the voltage acquisition channel 100 provided by the embodiment of the present disclosure includes a voltage acquisition circuit and a voltage acquisition sub-circuit, and the disconnection detection circuit 2000 includes a voltage acquisition sub-circuit 20 and a sampling chip 30. The voltage acquisition circuit 10 connects the single battery 110 of the battery pack 1000 and the voltage acquisition sub-circuit 20 corresponding to the single battery 110. The voltage acquisition sub-circuit 20 is configured to acquire the voltage of the corresponding single battery 110 through the voltage acquisition circuit 10 and input to the sampling chip 30. The single battery 110 includes a first single battery and a second single battery adjacent to the first single battery. The sampling chip 30 is configured to:

[0273] Control the closing or opening of the control switch 21 of the voltage acquisition sub-circuit 20;

[0274] Acquire the first voltage of the first single battery and the second voltage of the second single battery;

[0275] According to the first voltage, the second voltage and the threshold value, the disconnection state of the voltage acquisition circuit 10 connected to the first single battery is determined.

[0276] The above description of the disconnection detection method of the embodiment of the present disclosure also applies to the disconnection detection circuit 2000 of the embodiment of the present disclosure, and will not be repeated here.

[0277] In some embodiments, the voltage collection circuit 10 connected to the same single battery 110 includes a first voltage collection circuit and a second voltage collection circuit, the positive electrode of the single battery 110 is connected to the first voltage collection circuit, the negative electrode of the single battery 110 is connected to the second voltage collection circuit, and the single battery 110 is connected to the voltage collection sub-circuit 20 through the first voltage collection circuit and the second voltage collection circuit. The voltage collection sub-circuit 20 includes a first detection resistor 22, a second detection resistor 23, and a control switch 21. The control switch 21 is arranged between the first voltage collection circuit and the second voltage collection circuit. The first pole of the control switch 21 is connected to the first voltage collection circuit through the first detection resistor 22. The second pole of the control switch 21 is connected to the second voltage collection circuit through the second detection resistor 23. The control pole of the control switch 21 is connected to the control port of the sampling chip 30. The control port is configured to control the on-off of the control switch 21.

[0278] Specifically, the first detection resistor 22 is used to connect the first voltage collection circuit connected to the positive electrode of the single battery 110 corresponding to the voltage collection sub-circuit 20. The second detection resistor 23 is used to connect the second voltage collection circuit connected to the negative electrode of the single battery 110. The control port of the sampling chip 30 is used to control the on-off of the control switch 21. When the control switch 21 is closed, the first detection resistor 22, the second detection resistor 23, and the control switch 21 can form a target loop. The target current flowing through the target loop can be used to determine the line resistance state of the voltage collection circuit 10.

[0279] In this way, by arranging the detection resistor and the control switch 21, when the control switch 21 is closed, the detection resistor and the control switch 21 can form a loop for determining the line resistance state of the voltage collection circuit 10.

[0280] In some embodiments, the voltage collection sub-circuit 20 further includes a first sampling resistor 25 and a second sampling resistor 26. The first detection resistor 22 is connected to the first sampling port of the sampling chip 30 through the first sampling resistor 25. The second detection resistor 23 is connected to the second sampling port of the sampling chip 30 through the second sampling resistor 26. The first sampling port and the second sampling port are configured to collect the voltage of the single battery 110.

[0281] Specifically, one end of the first sampling resistor R4 n is connected to the first voltage collection circuit through the first detection resistor 22. The other end of the first sampling resistor R4 n is connected to the sampling capacitor 27 and the first sampling port of the sampling chip 30. The other end of the second sampling resistor R5 nOne end of the second sampling resistor R5 is connected to the second voltage collection circuit through the second detection resistor 23, and the other end of the second sampling resistor R5 is connected to the sampling capacitor Cn and the second sampling port of the sampling chip 30. n The first sampling port and the second sampling port of the sampling chip 30 are used to detect the voltage of the connected sampling capacitor 27, and the capacitor voltage of the sampling capacitor 27 can represent the voltage of the corresponding single battery 110. The voltage collection sub-circuit 20 further comprises a current-limiting resistor R6 n .

[0282] In this way, the first sampling port and the second sampling port of the sampling chip 30 can collect the voltage of the corresponding connected single battery 110 through the first sampling resistor 25 and the second sampling resistor 26, so as to realize the collection of the voltage, and according to the collected voltage of the single battery 110, the disconnection state of the voltage collection circuit 10 can be determined.

[0283] The embodiment of the present disclosure provides a vehicle, which comprises the disconnection detection circuit 2000 according to any one of the above embodiments or the electronic device according to the above embodiments.

[0284] The embodiment of the present disclosure provides a computer readable storage medium, which stores a computer program. When the program is executed by a processor, the steps of the disconnection detection method according to any one of the above embodiments are realized.

[0285] It can be understood that the computer program comprises computer program code. The computer program code can be in the form of source code, object code, executable files or some intermediate forms. The computer readable storage medium can comprise any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM) and software distribution medium.

[0286] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples without contradiction.

[0287] In addition, the term "connection" should be interpreted broadly, for example, it can include fixed connection, or detachable connection, or integral connection; it can include direct connection, or indirect connection through intermediate medium, or it can include communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0288] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0289] Any process or method descriptions, flow diagrams, or other descriptions of processes or methods described herein or in the flow diagrams can be understood as representing modules, segments, or portions of code that include one or more executable instructions for implementing specific logical functions or steps in the process, and that the scope of preferred embodiments of the present disclosure includes additional implementation in which the functions are performed in different orders, in different ways, or in reverse order, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0290] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-described embodiments are exemplary and cannot be understood as limiting the present disclosure.

Claims

1. A method of broken wire detection for a voltage acquisition channel (100), wherein, The voltage acquisition channel (100) comprises a voltage acquisition circuit (10) and a voltage acquisition sub-circuit (20), the voltage acquisition circuit (10) is connected with a single battery (110) of a battery pack (1000) and the voltage acquisition sub-circuit (20) corresponding to the single battery (110), the voltage acquisition sub-circuit (20) is configured to acquire the voltage of the corresponding single battery (110) through the voltage acquisition circuit (10), the single battery (110) comprises a first single battery and a second single battery adjacent to the first single battery, and the broken line detection method comprises: controlling the control switch (21) of the voltage acquisition sub-circuit (20) to be closed or opened; acquiring the first voltage of the first single battery and the second voltage of the second single battery; determining the broken line state of the voltage acquisition channel (100) connected with the first single battery according to the first voltage, the second voltage and the set threshold value.

2. The broken wire detection method according to claim 1, wherein The battery pack (1000) comprises a plurality of single batteries (110) connected in sequence, each single battery (110) corresponds to a voltage acquisition sub-circuit (20), and the control of the control switch (21) of the voltage acquisition sub-circuit (20) to be closed or opened comprises: controlling the control switch (21) of the first sequence voltage acquisition sub-circuit to be closed, the first sequence voltage acquisition sub-circuit comprising the voltage acquisition sub-circuit corresponding to the 2k-1th single battery in the battery pack; controlling the control switch (21) of the second sequence voltage acquisition sub-circuit to be opened, the second sequence voltage acquisition sub-circuit comprising the voltage acquisition sub-circuit (20) corresponding to the 2kth single battery (110) in the battery pack (1000), so that the battery pack (1000) is in a first state, wherein k is an integer greater than or equal to 1; The acquisition of the first voltage of the first single battery and the second voltage of the second single battery comprises: acquiring the first voltage of the first single battery in the first state and the second voltage of the second single battery in the first state.

3. The broken wire detection method according to claim 2, wherein The set threshold value comprises a first set value and a second set value, the first set value is greater than the second set value, and in the case that the first single battery is the 2k-1th single battery (110) and the second single battery is the 2kth single battery (110), the determination of the broken line state of the voltage acquisition channel (100) connected with the first single battery according to the first voltage, the second voltage and the set threshold value comprises: in the first state, if the first voltage is less than the second set value and the second voltage is greater than the first set value, it is determined that the voltage acquisition circuit (10) connected with the positive electrode of the first single battery exists a broken line.

4. The broken wire detection method according to claim 2 or 3, wherein The setting threshold value includes a first setting value and a second setting value, the first setting value is greater than the second setting value, in the case that the first single battery is the 2kth single battery (110) and the second single battery is the 2k+1th single battery (110), the determination of the disconnection state of the voltage acquisition channel (100) connected with the first single battery according to the first voltage, the second voltage and the setting threshold value includes: In the first state, if the first voltage is greater than the first setting value and the second voltage is less than the second setting value, it is determined that the voltage acquisition line (10) connected with the positive electrode of the first single battery exists disconnection.

5. The broken wire detection method according to any one of claims 1 to 4, wherein The battery pack includes a plurality of single batteries (110) connected in sequence, each single battery (110) corresponds to a voltage acquisition subcircuit (20), and the control of the closing or opening of the control switch (21) of the voltage acquisition subcircuit (20) includes: The control switch (21) of the first sequence voltage acquisition subcircuit is controlled to be opened, the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit (20) corresponding to the 2k-1th single battery (110) in the battery pack (1000); The control switch (21) of the second sequence voltage acquisition subcircuit is controlled to be closed, the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit (20) corresponding to the 2kth single battery (110) in the battery pack (1000), so that the battery pack (1000) is in the second state, wherein k is an integer greater than or equal to 1; The first voltage of the first single battery and the second voltage of the second single battery are obtained, including: The first voltage of the first single battery in the second state and the second voltage of the second single battery in the second state are obtained.

6. The broken wire detection method according to claim 5, wherein The setting threshold value includes a first setting value and a second setting value, the first setting value is greater than the second setting value, in the case that the first single battery is the 2kth single battery (110) and the second single battery is the 2k+1th single battery (110), the determination of the disconnection state of the voltage acquisition channel (100) connected with the first single battery according to the first voltage, the second voltage and the setting threshold value includes: In the second state, if the first voltage is less than the second setting value and the second voltage is greater than the first setting value, it is determined that the voltage acquisition line (10) connected with the positive electrode of the first single battery exists disconnection.

7. The broken wire detection method according to claim 5 or 6, wherein The setting threshold value includes a first setting value and a second setting value, the first setting value is greater than the second setting value, in the case that the first single battery is the 2kth single battery (110) and the second single battery is the 2k+1th single battery (110), the determination of the disconnection state of the voltage acquisition channel (100) connected with the first single battery according to the first voltage, the second voltage and the setting threshold value includes: In the second state, if the first voltage is greater than a first set value and the second voltage is less than a second set value, it is determined that the voltage collection line (10) connected to the positive electrode of the first single battery is disconnected.

8. The broken wire detection method according to any one of claims 1 to 7, wherein, The disconnection detection method further comprises: controlling the control switches (21) of all the voltage collection sub-circuits (20) to be off, so that the battery pack (1000) is in a third state; The method further comprises: obtaining the first voltage of the first single battery and the second voltage of the second single battery in the third state.

9. The broken wire detection method according to claim 8, wherein The battery pack (1000) comprises a plurality of single batteries (110) connected in sequence, wherein the second single battery is the previous single battery (110) or the next single battery (110) of the first single battery in the battery pack (1000), the set threshold value comprises a first voltage threshold value which is a positive value and a second voltage threshold value which is a negative value, and the determination of the disconnection state of the voltage collection channel (100) connected to the first single battery according to the first voltage, the second voltage and the set threshold value comprises: In the third state, if the target difference value of the first voltage is greater than the first voltage threshold value and the target difference value of the second voltage is less than the second voltage threshold value, it is determined that the voltage collection line (10) connected to the positive electrode of the first single battery is disconnected, and the target difference value is the difference between the average single battery voltage and the voltage.

10. The broken wire detection method according to claim 8 or 9, wherein The battery pack (1000) comprises a plurality of single batteries (110) connected in sequence, wherein the second single battery is the previous single battery (110) or the next single battery (110) of the first single battery in the battery pack (1000), the set threshold value comprises a first voltage threshold value which is a positive value and a second voltage threshold value which is a negative value, and the determination of the disconnection state of the voltage collection channel (100) connected to the first single battery according to the first voltage, the second voltage and the set threshold value comprises: In the third state, if the target difference value of the first voltage is less than the second voltage threshold value and the target difference value of the second voltage is greater than the first voltage threshold value, it is determined that the voltage collection line (10) connected to the positive electrode of the first single battery is disconnected, and the target difference value is the difference between the average single battery voltage and the voltage.

11. The disconnection detection method according to claim 8, wherein The battery pack (1000) comprises a plurality of single batteries (110) connected in sequence, the set threshold value comprises a first voltage threshold value which is a positive value and a second set value, and the first single battery is the first one in the battery pack (1000) and the second single battery is the second one in the battery pack (1000), and the determination of the disconnection state of the voltage collection channel (100) connected to the first single battery according to the first voltage, the second voltage and the set threshold value comprises: In a case where the first voltage is less than the second set value and a target difference value of the second voltage is greater than the first voltage threshold value, it is determined that a voltage collection line (10) connected to a negative electrode of the first single battery has a disconnection, and the target difference value is a difference between a single voltage average and the voltage.

12. The broken wire detection method according to claim 8 or 11, wherein The battery pack (1000) includes m single batteries (110) connected in sequence, the set threshold value includes a second set value and a first voltage threshold value which is a positive value, in a case where the first single battery has an mth order in the battery pack (1000) and the second single battery has an (m-1)th order in the battery pack (1000), the determination of the disconnection state of the voltage collection channel connected to the first single battery according to the first voltage, the second voltage and the set threshold value includes: In a case where the first voltage is less than the second set value and a target difference value of the second voltage is greater than the first voltage threshold value, it is determined that a voltage collection line (10) connected to a positive electrode of the first single battery has a disconnection, and the target difference value is a difference between a single voltage average and the voltage, wherein m is a positive integer greater than 1.

13. The broken wire detection method according to any one of claims 1-12, wherein, The battery pack (1000) includes a plurality of single batteries (110) connected in sequence, and in a case where it is determined that all the voltage collection lines (10) do not have disconnections, the disconnection detection method further includes: controlling a control switch (21) of a first sequence voltage collection sub-circuit to be closed, the first sequence voltage collection sub-circuit including the voltage collection sub-circuit (20) corresponding to the 2k-1th single battery (110) in the battery pack (1000); obtaining a third voltage of the 2k-1th single battery (110) in the battery pack (1000); determining a line resistance state of a voltage collection line (10) connected to the 2k-1th single battery (110) in the battery pack according to the third voltage and a first target current, wherein k is an integer greater than or equal to 1, and the first target current is determined according to a voltage in a third state of the 2k-1th single battery (110) or a single voltage average, and in a case where the battery pack (1000) is in the third state, all the control switches (21) are open.

14. The broken wire detection method according to any one of claims 1-13, wherein, The voltage collection sub-circuit (20) includes a plurality of resistors, in a case where a control switch (21) of the voltage collection sub-circuit (20) is closed, the resistors, the single battery (110) and the control switch (21) form a first target loop, the first target current is a current in the first target loop, and the determination of the line resistance state of the voltage collection line (10) connected to the 2k-1th single battery (110) in the battery pack (1000) according to the third voltage and the first target current includes: determining a first reference voltage according to the first target current, an internal resistance of the control switch (21) and a resistance value of the resistor; In a case where the third voltage is less than the first reference voltage, it is determined that the line resistance of the voltage collection line connected to the 2k-1th monomer battery (110) in the battery pack (1000) is too large.

15. The broken wire detection method according to any one of claims 1-14, wherein, The battery pack (1000) includes a plurality of monomer batteries (110) connected in sequence, and in a case where it is determined that there is no disconnection in all the voltage collection lines (10), the disconnection detection method further includes: controlling a control switch (21) of a second sequence voltage collection sub-circuit to be closed, the second sequence voltage collection sub-circuit including the voltage collection sub-circuit (20) corresponding to the 2kth monomer battery (110) in the battery pack (1000); obtaining a fourth voltage of the 2kth monomer battery (110) in the battery pack (1000); determining the line resistance state of the voltage collection line (10) connected to the 2kth monomer battery (110) in the battery pack (1000) according to the fourth voltage and a second target current, wherein k is an integer greater than or equal to 1, the second target current is determined according to the voltage or the average monomer voltage of the 2kth monomer battery (110) in a third state, and in a case where the battery pack (1000) is in the third state, all the control switches (21) are open.

16. The broken wire detection method according to any one of claims 1-15, wherein, The voltage collection sub-circuit (20) includes a plurality of resistors, in a case where the control switch (21) of the voltage collection sub-circuit (20) is closed, the resistors, the monomer battery (110) and the control switch (21) form a second target loop, the second target current is a current in the second target loop, and the determining the line resistance state of the voltage collection line (10) connected to the 2kth monomer battery (110) in the battery pack (1000) according to the fourth voltage and a second target current includes: determining a second reference voltage according to the second target current, the internal resistance of the control switch (21) and the resistance value of the resistor; in a case where the fourth voltage is less than the second reference voltage, it is determined that the line resistance of the voltage collection line (10) connected to the 2kth monomer battery (110) in the battery pack (1000) is too large.

17. The broken wire detection method of any one of claims 1-16, wherein, The disconnection detection method further includes: obtaining an average monomer voltage of all the monomer batteries (110); in a case where the average monomer voltage is within a preset voltage range, it is determined to perform the disconnection detection to determine the disconnection state of the voltage collection channel (100); in a case where the average monomer voltage is outside the preset voltage range, it is determined not to perform the disconnection detection.

18. The broken wire detection method of any one of claims 1-17, wherein, The set threshold value includes a first set value and a second set value, the second set value is less than the first set value, the first set value is determined according to the average monomer voltage and the voltage drop of the control switch (21), and the second set value is determined according to the voltage drop of the control switch (21).

19. A broken wire detection circuit (2000) of a voltage acquisition channel (100), wherein The voltage acquisition channel (100) comprises a voltage acquisition line (10) and a voltage acquisition sub-circuit (20), the disconnection detection circuit (2000) comprises a voltage acquisition sub-circuit (20) and a sampling chip (30), the voltage acquisition line (10) is connected to a single battery (110) of a battery pack (1000) and a voltage acquisition sub-circuit (20) corresponding to the single battery (110), the voltage acquisition sub-circuit (20) is configured to acquire the voltage of the corresponding single battery (110) through the voltage acquisition line (10) and input to the sampling chip (30), the single battery comprises a first single battery and a second single battery adjacent to the first single battery, and the sampling chip is configured to: control the control switch (21) of the voltage acquisition sub-circuit (20) to be closed or opened; acquire the first voltage of the first single battery and the second voltage of the second single battery; determine the disconnection state of the voltage acquisition channel (100) connected to the first single battery according to the first voltage, the second voltage and a set threshold value.

20. The broken wire detection circuit (2000) of claim 19, wherein, The positive electrode of the single battery (110) is connected to the first voltage acquisition line, the negative electrode of the single battery (110) is connected to the second voltage acquisition line, and the single battery (110) is connected to the voltage acquisition sub-circuit (20) through the first voltage acquisition line and the second voltage acquisition line, the voltage acquisition sub-circuit (20) comprises a first detection resistor (22), a second detection resistor (23) and the control switch (21), the control switch (21) is arranged between the first voltage acquisition line and the second voltage acquisition line, the first pole of the control switch (21) is connected to the first voltage acquisition line through the first detection resistor (22), the second pole of the control switch (21) is connected to the second voltage acquisition line through the second detection resistor (23), and the control pole of the control switch (21) is connected to the control port of the sampling chip (30), and the control port is configured to control the on-off of the control switch (21).

21. The broken wire detection circuit (2000) of claim 20, wherein, In the case that the control switch (21) is closed, the single battery (110), the first detection resistor (22), the second detection resistor (23) and the control switch (21) form a target loop, and the target loop is configured to determine the line resistance state of the first detection line.

22. The broken wire detection circuit (2000) according to claim 20 or 21, wherein The voltage acquisition sub-circuit (20) further comprises a first sampling resistor (25) and a second sampling resistor (26), the first detection resistor (22) is connected to the first sampling port of the sampling chip (30) through the first sampling resistor (25), the second detection resistor (23) is connected to the second sampling port of the sampling chip (30) through the second sampling resistor (26), and the first sampling port and the second sampling port are configured to acquire the voltage of the single battery (110).

23. An electronic device, wherein, The electronic device comprises one or more processors and a memory, the memory storing a computer program which, when executed by the processor, implements the steps of the broken wire detection method according to any one of claims 1 to 18.

24. A vehicle, wherein, The vehicle comprises a broken wire detection circuit according to any one of claims 19 to 22 or an electronic device according to claim 23.

25. A computer readable storage medium having stored thereon a computer program, wherein, The program, when executed by the processor, implements the steps of the broken wire detection method according to any one of claims 1 to 18.

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