Broken line detection method, circuit and device of voltage acquisition channel, vehicle and medium

Abstract

The invention discloses a disconnection detection method of a voltage acquisition channel, a disconnection detection circuit of the voltage acquisition channel, an electronic device, a vehicle and a computer readable storage medium. A voltage acquisition circuit of a voltage acquisition channel is connected with single batteries of a battery pack and voltage acquisition sub-circuits corresponding to the single batteries, the voltage acquisition sub-circuits are configured to acquire voltages of the corresponding single batteries, and the single batteries comprise a first single battery and a second single battery adjacent to the first single battery. The disconnection detection method comprises the following steps: controlling a control switch of a voltage acquisition sub-circuit to be closed; collecting a first voltage of the first single battery and a second voltage of the second single battery; and according to the first voltage, the second voltage and a set threshold value, determining a disconnection state of a voltage acquisition channel connected with the first single battery. The control method does not need to use a diagnosis process of the sampling chip, can be used for being matched with various sampling chips to carry out broken line detection, and is high in universality.

Description

Technical Field

[0001] The present application relates to the technical field of line break detection, and more specifically, to a line break detection method for a voltage acquisition channel, a line break detection circuit for a voltage acquisition channel, an electronic device, a vehicle, and a computer-readable storage medium. Background Art

[0002] With the development of new energy vehicles, the requirements for automotive product functions are getting higher and higher. The battery management system of new energy vehicles collects and monitors the voltage of single cells through sampling chips. If the voltage collection line connecting the single cell to the sampling chip is broken, the collected battery voltage will be inaccurate. Usually, the diagnostic function of the sampling chip can be used to diagnose whether the voltage collection line is broken.

[0003] In the related art, different sampling chips have different diagnostic processes for disconnection, and the versatility is low. Targeted software development is required for different chips, and the control is complex. Summary of the invention

[0004] Embodiments of the present application provide a disconnection detection method for a voltage acquisition channel, a disconnection detection circuit for a voltage acquisition channel, an electronic device, a vehicle, and a computer-readable storage medium.

[0005] The embodiment of the present application provides a disconnection detection method for a voltage acquisition channel, wherein the voltage acquisition channel includes a voltage acquisition circuit and a voltage acquisition subcircuit, wherein the voltage acquisition circuit connects a single cell of a battery pack and the voltage acquisition subcircuit corresponding to the single cell, wherein the voltage acquisition subcircuit is configured to acquire the voltage of the corresponding single cell through the voltage acquisition circuit, wherein the single cell includes a first single cell and a second single cell adjacent to the first single cell, and wherein the disconnection detection method includes:

[0006] Controlling the control switch of the voltage acquisition subcircuit to close or open;

[0007] collecting a first voltage of the first single cell and a second voltage of the second single cell;

[0008] The disconnection state of the voltage collection channel connected to the first single battery is determined according to the first voltage, the second voltage and a set threshold.

[0009] 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 application, when there is a disconnection in the voltage acquisition channel, after closing the control switch of the voltage acquisition subcircuit, the voltages of the two adjacent single cells will be significantly different from the voltages when there is no disconnection. Therefore, according to the first voltage of the first single cell acquired after the control switch is closed, the second voltage of the second single cell adjacent to it and the set threshold, it can be determined whether there is a disconnection in the voltage acquisition circuit connected to the first single cell, without using the diagnostic process of the sampling chip itself, and can be used in conjunction with various sampling chips for disconnection detection, with strong versatility.

[0010] In some embodiments, the battery pack includes a plurality of sequentially connected single cells, each of the single cells corresponds to one of the voltage collection subcircuits, and the control switch of the voltage collection subcircuits is closed or opened, including:

[0011] Controlling a control switch of a first sequence voltage acquisition subcircuit to be closed, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single cell in the battery pack;

[0012] Controlling the control switch of the second sequence voltage acquisition subcircuit to be turned off, the second sequence voltage acquisition subcircuit including the voltage acquisition subcircuit corresponding to the 2kth single battery in the battery pack, so that the battery pack is in the first state, wherein k is an integer greater than or equal to 1;

[0013] The obtaining of the first voltage of the first single cell and the second voltage of the second single cell includes:

[0014] A first voltage of the first single cell in the first state and a second voltage of the second single cell in the first state are obtained.

[0015] In some embodiments, the set threshold includes a first set value and a second set value, the first set value is greater than the second set value, and when the first single cell is the 2k-1th single cell and the second single cell is the 2kth single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0016] 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

[0017] In some embodiments, the set threshold includes a first set value and a second set value, the first set value is greater than the second set value, and when the first single cell is the 2kth single cell and the second single cell is the 2k+1th single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0018] 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

[0019] In some embodiments, the battery pack includes a plurality of sequentially connected single cells, each of the single cells corresponds to one of the voltage collection subcircuits, and the control switch of the voltage collection subcircuits is closed or opened, including:

[0020] Controlling the control switch of the first sequence voltage acquisition subcircuit to be turned off, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single battery in the battery pack;

[0021] Controlling a control switch of a second sequence voltage acquisition subcircuit to be closed, wherein 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;

[0022] The obtaining of the first voltage of the first single cell and the second voltage of the second single cell includes:

[0023] A first voltage of the first single cell in the second state and a second voltage of the second single cell in the second state are acquired.

[0024] In some embodiments, the set threshold includes a first set value and a second set value, and when the first single cell is the 2kth single cell and the second single cell is the 2k+1th single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0025] In the second state, if the first voltage is less than a second set value and the second voltage is greater than the first set value, it is determined that a voltage collection circuit connected to the positive electrode of the first single battery is broken.

[0026] In some embodiments, the set threshold includes a first set value and a second set value, and when the first single cell is the 2k-1th single cell and the second single cell is the 2kth single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0027] 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

[0028] In some embodiments, the disconnection detection method further comprises:

[0029] Disconnecting the control switches of all the voltage acquisition sub-circuits to put the battery pack in a third state;

[0030] The obtaining of the first voltage of the first single cell and the second voltage of the second single cell comprises:

[0031] A first voltage of the first single cell in the third state and a second voltage of the second single cell in the third state are acquired.

[0032] In some embodiments, the battery pack includes a plurality of sequentially connected single cells, in the battery pack, the second single cell is a previous single cell or a subsequent single cell of the first single cell, the set threshold includes a positive first voltage threshold and a negative second voltage threshold, and determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0033] 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 is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage.

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

[0035] In the third state, if the target difference of the first voltage is less than the second voltage threshold, and the target difference of the second voltage is greater than the first voltage threshold, it is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage.

[0036] In some embodiments, the battery pack includes a plurality of sequentially connected single cells, the set threshold includes a first voltage threshold value and a second set value that are positive values, and when the first single cell is ranked first in the battery pack and the second single cell is ranked second in the battery pack, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold value includes:

[0037] When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that the voltage collection circuit connected to the negative electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage.

[0038] In some embodiments, the battery pack includes m single cells connected in sequence, the set threshold includes a second set value and a positive first voltage threshold, and when the first single cell is ranked mth in the battery pack and the second single cell is ranked m-1th in the battery pack, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes:

[0039] When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage, where m is a positive integer greater than 1.

[0040] In some embodiments, the battery pack includes a plurality of sequentially connected single cells. When it is determined that all the voltage acquisition lines are not disconnected, the disconnection detection method further includes:

[0041] Controlling a control switch of a first sequence voltage acquisition subcircuit to be closed, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single cell in the battery pack;

[0042] Obtaining a third voltage of the 2k-1th single cell in the battery pack;

[0043] Based on the third voltage and the first target current, the line resistance state of the voltage acquisition circuit connected to the 2k-1th single cell in the battery pack is determined, wherein k is an integer greater than or equal to 1, and the first target current is determined based on the voltage of the 2k-1th single cell in the third state or the average of the single cell voltages, and when the battery pack is in the third state, all the control switches are disconnected.

[0044] In some embodiments, the voltage acquisition subcircuit includes a plurality of resistors. When a control switch of the voltage acquisition subcircuit is closed, the resistors, the single cells, and the control switch form a first target loop. The first target current is a current in the first target loop. The determining, according to the third voltage and the first target current, a line resistance state of a voltage acquisition circuit connected to the 2k-1th single cell in the battery pack includes:

[0045] determining a first reference voltage according to the first target current, the internal resistance of the control switch and the resistance value of the resistor;

[0046] When the third voltage is less than the first reference voltage, it is determined that the line resistance of the voltage acquisition line connected to the 2k-1th single battery in the battery pack is too large.

[0047] In some embodiments, the battery pack includes a plurality of sequentially connected single cells. When it is determined that all the voltage acquisition lines are not disconnected, the disconnection detection method further includes:

[0048] Controlling a control switch of a second sequence voltage acquisition subcircuit to be closed, wherein the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2kth single battery in the battery pack;

[0049] Acquire a fourth voltage of the 2kth single cell in the battery pack;

[0050] According to the fourth voltage and the second target current, the line resistance state of the voltage collection circuit connected to the 2kth single cell in the battery pack is determined, wherein k is an integer greater than or equal to 1, and the second target current is determined based on the voltage of the 2kth single cell in the third state or the average of the single cell voltages, and when the battery pack is in the third state, all the control switches are disconnected.

[0051] In some embodiments, the voltage acquisition subcircuit includes a plurality of resistors. When a control switch of the voltage acquisition subcircuit is closed, the resistors, the single cells, and the control switch form a second target loop. The second target current is a current in the second target loop. The determining, according to the fourth voltage and the second target current, a line resistance state of a voltage acquisition circuit connected to the 2kth single cell in the battery pack includes:

[0052] 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;

[0053] When the fourth voltage is less than the second reference voltage, it is determined that the line resistance of the voltage acquisition line connected to the 2kth single battery in the battery pack is too large.

[0054] In some embodiments, the disconnection detection method further comprises:

[0055] Obtaining the average value of the single cell voltage of all the single cells;

[0056] When the monomer voltage mean value is within the preset voltage range, it is determined to perform disconnection detection to determine whether the voltage acquisition channel is disconnected. When the monomer voltage mean value is outside the preset voltage range, it is determined not to perform the disconnection detection.

[0057] In some embodiments, the set threshold includes a first set value and a second set value, the second set value is smaller than the first set value, the first set value is determined based on the cell voltage average and the voltage drop of the control switch, and the second set value is determined based on the voltage drop of the control switch.

[0058] The embodiment of the present application provides a disconnection detection circuit of a voltage acquisition channel, wherein the voltage acquisition channel includes a voltage acquisition circuit and a voltage acquisition subcircuit, and the disconnection detection circuit includes a voltage acquisition subcircuit and a sampling chip, wherein the voltage acquisition circuit connects a single cell of a battery pack and a voltage acquisition subcircuit corresponding to the single cell, and the voltage acquisition subcircuit is configured to acquire the voltage of the corresponding single cell through the voltage acquisition circuit and input it to the sampling chip, wherein the single cell includes a first single cell and a second single cell adjacent to the first single cell, and the sampling chip is configured as follows:

[0059] Controlling the control switch of the voltage acquisition subcircuit to close or open;

[0060] collecting a first voltage of the first single cell and a second voltage of the second single cell;

[0061] The disconnection state of the voltage collection channel connected to the first single battery is determined according to the first voltage, the second voltage and a set threshold.

[0062] In some embodiments, the positive electrode of the single cell is connected to a first voltage acquisition circuit, the negative electrode of the single cell is connected to a second voltage acquisition circuit, the single cell is connected to the voltage acquisition sub-circuit through the first voltage acquisition circuit and the second voltage acquisition circuit, the voltage acquisition sub-circuit includes a first detection resistor, a second detection resistor and the control switch, the control switch is arranged between the first voltage acquisition circuit and the second voltage acquisition circuit, the first pole of the control switch is connected to the first voltage acquisition circuit through the first detection resistor, the second pole of the control switch is connected to the second voltage acquisition circuit through the second detection resistor, the control pole of the control switch is connected to the control port of the sampling chip, and the control port is configured to control the on and off of the control switch.

[0063] In certain 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.

[0064] In some embodiments, the voltage acquisition subcircuit further includes a first sampling resistor and a second sampling resistor, the first detection resistor is connected to a first sampling port of the sampling chip through the first sampling resistor, the second detection resistor is connected to a second sampling port of the sampling chip through the second sampling resistor, and the first sampling port and the second sampling port are configured to acquire the voltage of the single cell.

[0065] An embodiment of the present application provides an electronic device, which includes one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the disconnection detection method as described in any of the above embodiments are implemented.

[0066] An embodiment of the present application provides a vehicle, wherein the vehicle includes a disconnection detection circuit as described in any one of the above embodiments or an electronic device as described in any one of the above embodiments.

[0067] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the disconnection detection method as described in any of the above embodiments are implemented.

[0068] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0070] Figure 1 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0071] Figure 2 is a partial schematic diagram of a battery pack and a disconnection detection circuit according to an embodiment of the present application;

[0072] Figure 3 is a partial schematic diagram of a battery pack and a disconnection detection circuit according to an embodiment of the present application;

[0073] Figure 4 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0074] Figure 5 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0075] Figure 6 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0076] Figure 7 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0077] Figure 8 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0078] Fig. 9 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0079] Fig.10 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0080] Fig.11 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0081] Fig.12 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0082] Fig.13 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0083] Fig.14 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0084] Fig.15 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0085] Fig.16 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0086] Fig.17 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0087] Fig.18 It is a flow chart of a disconnection detection method according to an embodiment of the present application;

[0088] Fig.19 It is a flowchart of a disconnection detection method according to an embodiment of the present application. DETAILED DESCRIPTION

[0089] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0090] With the development of new energy vehicles, the requirements for automotive product functions are getting higher and higher. The battery management system of new energy vehicles collects and monitors the voltage of single cells through sampling chips. If the voltage collection line connecting the single cell to the sampling chip is broken, the collected battery voltage will be inaccurate. Usually, the diagnostic function of the sampling chip can be used to diagnose whether the voltage collection line is broken.

[0091] In the related art, different sampling chips have different diagnostic processes for disconnection, and the versatility is low. Targeted software development is required for different chips, and the control is complex.

[0092] Based on the above unresolved issues, please refer to Figures 1 to 3 The embodiment of the present application provides a disconnection detection method for a voltage acquisition channel 100. The voltage acquisition channel 100 includes a voltage acquisition circuit 10 and a voltage acquisition subcircuit 20. The voltage acquisition circuit 10 connects a single cell 110 of a battery pack 1000 and a voltage acquisition subcircuit 20 corresponding to the single cell 110. The voltage acquisition subcircuit 20 is configured to acquire the voltage of the corresponding single cell 110 through the voltage acquisition circuit 10. The single cell 110 includes a first single cell and a second single cell adjacent to the first single cell. The disconnection detection method includes:

[0093] 01: the control switch 21 of the control voltage acquisition subcircuit 20 is closed or opened;

[0094] 02: collecting a first voltage of a first single cell and a second voltage of a second single cell;

[0095] 03: Determine 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.

[0096] The embodiment of the present application provides an electronic device, which includes one or more processors and a memory, wherein the memory stores a computer program, and the computer program can be executed by the processor. The processor can be used to control the control switch 21 of the voltage acquisition subcircuit 20 to be closed or opened; and to collect the first voltage of the first single cell and the second voltage of the second single cell; and can also be used to determine the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage and the set threshold.

[0097] The embodiment of the present application provides a disconnection detection device for a voltage acquisition circuit 10, and the disconnection detection device includes 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 subcircuit 20 to be closed or opened; the first acquisition module can be used to collect the first voltage of the first single cell and the second voltage of the second single cell; the first determination module can be used to determine the disconnection state of the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage, and a set threshold.

[0098] Specifically, the battery pack 1000 includes n single cells 110 connected in series in sequence, and the sequence of the single cells 110 increases from negative to positive, wherein n is an integer greater than 0. Figure 2 The battery pack 1000 includes 16 cells 110. The negative electrode of each cell 110 except the first cell 110 is connected to the positive electrode of the adjacent cell 110, and the positive electrode of each cell 110 except the last cell 110 is connected to the negative electrode of the adjacent cell 110.

[0099] A single cell 110 is connected to the sampling chip 30 via a voltage collection channel 100. A voltage collection channel 100 includes two voltage collection lines 10 and a voltage collection sub-circuit 20. Two adjacent voltage collection channels 100 share a voltage collection line 10. The voltage collection sub-circuit 20 of the voltage collection channel 100 is connected to the single cell 110 in a one-to-one correspondence. The positive electrode of a single cell 110 is connected to a voltage collection sub-circuit 20 via a voltage collection line 10, and the negative electrode of a single cell 110 is connected to a voltage collection sub-circuit 20 via another voltage collection line 10.

[0100] The connection points of the positive and negative electrodes of two adjacent single cells 110 connected to each other are connected to a voltage acquisition circuit 10, that is, two adjacent voltage acquisition subcircuits 20 share a voltage acquisition circuit 10 on the side close to each other to connect the single cells 110. The voltage acquisition subcircuit 20 is also connected to a sampling chip 30, which is used to obtain the voltage collected by the voltage acquisition subcircuit 20 and to control the conduction and closing of the control switch 21 of the voltage acquisition subcircuit 20. It is worth noting that a battery pack 1000 can use multiple sampling chips 30 for voltage acquisition. For example, the battery pack 1000 includes 60 single cells 11, and one sampling chip 30 can collect the voltage of 16 single cells 11, then 4 sampling chips 30 are required for voltage acquisition for 60 single cells 11.

[0101] The voltage acquisition subcircuit 20 also includes a detection resistor and a sampling resistor. The control switch 21 is connected between two adjacent voltage acquisition lines 10, the first end of the control switch 21 is connected to one voltage acquisition line 10 through a detection resistor, and the second end of the control switch 21 is connected to another voltage acquisition line 10 through another detection resistor.

[0102] The control switch 21 may be a switch element capable of switching on and off, such as an NPN transistor, an N-type transistor, or a P-type transistor, and is not limited here. In the embodiment of the present application, the control switch 21 is described as an NPN transistor.

[0103] The first single cell may be any single cell 110 in the battery pack 1000 , and the second single cell is a single cell 110 in the battery pack 1000 that is adjacent to the first single cell.

[0104] 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 cell 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 cell 110, and the two adjacent sampling ports are used to collect the voltage Vcell[n] of one single cell 110. For example, Vc0 and Vc1 are used together to collect the voltage Vcell[1] of the first single cell B1; Vc16 and Vc15 are used together to collect the voltage Vcell

[16] of the 16th single cell B16.

[0105] When the voltage acquisition channel 100 is normally free of disconnection, the voltages of the plurality of single cells 110 are relatively balanced and maintained within a certain appropriate range. The voltage acquisition subcircuit 20 of the voltage acquisition channel 100 can be set on a hardware circuit board, which is not prone to disconnection. However, if it is found that the voltage acquisition channel 100 is disconnected during inspection, and the voltage acquisition line 11 is not disconnected, it can be determined that the voltage acquisition subcircuit 20 is disconnected.

[0106] The voltage acquisition circuit 10 of the voltage acquisition channel 100 is a wiring harness directly connected to the single cell 110, which is prone to disconnection. The embodiment of the present application is described by checking the disconnection of the voltage acquisition circuit 10 as an example. Since two adjacent voltage acquisition subcircuits 20 share a voltage acquisition circuit 10, when the voltage acquisition circuit 10 is disconnected, the voltages collected by the two adjacent voltage acquisition subcircuits 20 connected to the voltage acquisition circuit 10 are inaccurate, that is, the voltages of the single cells 110 corresponding to the two adjacent voltage acquisition subcircuits 20 collected will be greatly different from the voltages of other single cells 110. Therefore, it can be determined whether the voltage acquisition circuit 10 connected to the first single cell is disconnected based on the first voltage of the first single cell obtained by collection, the second voltage of the single cell 110 adjacent to the first single cell, and the set threshold.

[0107] In one embodiment, the first single cell is the third single cell 110 connected in sequence in the battery pack 1000, and the second single cell is the fourth single cell 110 connected in sequence in the battery pack 1000. According to the comparison result of the first voltage of the first single cell, the second voltage of the second single cell 110 and the set threshold, it is determined that both the first voltage and the second voltage exceed the appropriate range, and it can be determined that the voltage acquisition channel 100 connecting the first single cell and the second single cell is disconnected.

[0108] In addition, the voltage collection circuit 10 connected to the negative electrode of the first single cell 110 connected in sequence in the battery pack 1000 is only connected to one voltage collection sub-circuit 20, and the voltage collection circuit 10 connected to the positive electrode of the nth single cell 110 connected in sequence in the battery pack 1000 is also only connected to one voltage collection sub-circuit 20. In the case where the voltage collection channel 100 connected to the negative electrode of the first single cell 110 is disconnected, the collected voltages of the first single cell 110 and the second single cell 110 will be inaccurate, so it can be determined whether the voltage collection channel 100 connected to the negative electrode of the first single cell 110 is disconnected based on the voltages collected from the first single cell 110 and the second single cell 110. Similarly, it can be determined whether the voltage collection circuit 10 connected to the positive electrode of the nth single cell 110 is disconnected based on the voltages collected from the nth single cell 110 and the n-1th single cell 110.

[0109] Thus, in the disconnection detection method, disconnection detection circuit, disconnection detection device, electronic device, vehicle and computer-readable storage medium of the embodiment of the present application, when the voltage acquisition channel 100 is disconnected, after the control switch 21 of the voltage acquisition subcircuit is closed, the voltages of the two adjacent single cells 110 will be significantly different from the voltages when the disconnection is not present. Therefore, according to the first voltage of the first single cell acquired after the control switch 21 is closed, the second voltage of the second single cell adjacent thereto and the set threshold value, it can be determined whether the voltage acquisition channel 100 connected to the first single cell is disconnected, without using the diagnostic process of the sampling chip 30 itself, and can be used in conjunction with various sampling chips 30 for disconnection detection, with strong versatility.

[0110] See also Figure 4 In some embodiments, the battery pack 1000 includes a plurality of sequentially connected single cells 110, each single cell 110 corresponds to a voltage acquisition subcircuit 20, and step 01 (controlling the control switch 21 of the voltage acquisition subcircuit 20 to close or open) includes:

[0111] 011: Control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, the first sequence voltage acquisition subcircuit including the voltage acquisition subcircuit 20 corresponding to the 2k-1th single battery 110 in the battery pack 1000;

[0112] 012: Control the control switch 21 of the second sequence voltage acquisition subcircuit to be turned off, the second sequence voltage acquisition subcircuit including 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 first state, wherein k is an integer greater than or equal to 1;

[0113] Step 02 (obtaining a first voltage of a first single cell and a second voltage of a second single cell) includes:

[0114] 021: Obtain a first voltage of a first single cell in a first state, and a first voltage of a second single cell in a second state.

[0115] In some embodiments, the processor can be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, and the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2k-1th single cell 110 in the battery pack 1000; can be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to be opened, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2kth single cell 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; and can be used to obtain a first voltage of the first single cell in the first state, and a second voltage of the second single cell in the first state.

[0116] In some embodiments, the first control module includes a first control submodule and a second control submodule, and the first acquisition module includes a first acquisition submodule. The first control submodule can be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, and the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2k-1th single cell 110 in the battery pack 1000; the second control submodule can be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to be disconnected, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2kth single cell 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; the first acquisition submodule can be used to acquire the first voltage of the first single cell in the first state, and the second voltage of the second single cell in the first state.

[0117] Specifically, the first sequence voltage acquisition subcircuit includes all the voltage acquisition subcircuits 20 connected to the 2k-1th single battery 110 in the battery pack 1000, that is, the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 connected to all the single batteries 110 in the battery pack 1000 that are ranked as odd numbers. The second sequence voltage acquisition subcircuit includes all the voltage acquisition subcircuit 20 connected to the 2kth single battery 110 in the battery pack 1000, that is, the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 connected to all the single batteries 110 in the battery pack 1000 that are ranked as even numbers. Wherein, k is an integer greater than or equal to 1, for example, k is 1, 2, 3, 4 or 5, etc.

[0118] In one embodiment, the battery pack 1000 includes five single cells 110 connected in sequence. Then, the first sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the 1st single cell 110, the voltage acquisition sub-circuit 20 corresponding to the 3rd single cell 110, and the voltage acquisition sub-circuit 20 corresponding to the 5th single cell 110. The second sequence voltage acquisition sub-circuit includes the voltage acquisition sub-circuit 20 corresponding to the 2nd single cell 110 and the voltage acquisition sub-circuit 20 corresponding to the 4th single cell 110.

[0119] Simultaneously control the control switches 21 of all the voltage acquisition sub-circuits 20 connected to the single cells 110 with odd sequences to close, and control the control switches 21 of all the voltage acquisition sub-circuits 20 connected to the single cells 110 with odd sequences to open, so that all the single cells 110 of the battery pack 1000 are in the first state. At this time, collect the first voltage Vcello[i] of the first single cell in the first state and the second voltage Vcello[i + 1] or Vcello[i - 1] of the second single cell in the first state. Since the first single cell can be any one of the single cells 110 in the battery pack 1000, that is, collect the voltages of all the single cells 110 in the battery pack 1000 in the first state to obtain Vcello[n], where 0 < i < n. According to the first voltage, the second voltage, and the set threshold in the first state, the disconnection state of the voltage acquisition line 10 can be determined.

[0120] In this way, by controlling the control switches 21 of the voltage acquisition sub-circuits 20 corresponding to the single cells 110 with odd sequences to close, and controlling the control switches 21 of the voltage acquisition sub-circuits 20 corresponding to the single cells 110 with even sequences to open, the battery pack 1000 can be made to be in the first state. Collect the voltages of the first single cell and the second single cell when they are in the first state, and compare them with the set threshold, and the disconnection of the voltage acquisition line 10 connected to the first single cell can be determined.

[0121] Please refer to Figure 5 , in some embodiments, the set threshold includes a first set value and a second set value, the first set value is greater than the second set value. When the first single cell is the (2k - 1)th single cell 110 and the second single cell is the 2kth single cell 110, step 03 (determine the disconnection state of the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage, and the set threshold) includes:

[0122] 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, determine that there is a disconnection in the voltage acquisition line 10 connected to the positive electrode of the first single cell.

[0123] In some embodiments, the processor may be configured to determine that a voltage collection circuit 10 connected to the positive electrode of the first single cell is disconnected if the first voltage is less than a second set value and the second voltage is greater than the first set value in the first state.

[0124] In some embodiments, the first determination module includes a first determination submodule which can be used to determine that the voltage collection circuit 10 connected to the positive electrode of the first single cell is disconnected if the first voltage is less than the second set value and the second voltage is greater than the first set value in the first state.

[0125] Specifically, the first single cell and the second single cell use a common voltage acquisition circuit 10 to connect the corresponding voltage acquisition sub-circuits 20 , and the common voltage acquisition circuit 10 is used as a target circuit.

[0126] When the first single cell is the 2k-1th single cell 110 and the second single cell is the 2kth single cell 110, at this time, the second single cell is the single cell 110 that is arranged after the first single cell, the positive electrode of the first single cell is connected to the negative electrode of the second single cell, and the target line connects the positive electrode of the first single cell and the negative electrode of the second single cell.

[0127] Since the voltage collection circuits 10 connected to the positive electrodes of the single cells 110 other than the 1st to the n-1th single cells 110 are all connected to two voltage collection sub-circuits 20, when the voltage collection circuits 10 connected to the positive electrodes of the single cells 110 other than the nth single cell 110 are disconnected, the voltages collected by the two voltage collection sub-circuits 20 connected to the voltage collection circuits 10 will be inaccurate. Therefore, when the first voltage of the first single cell and the second voltage of the second single cell are inaccurate, it can be determined that the target circuit is disconnected.

[0128] After the control switches 21 of the voltage acquisition subcircuit 20 connected to all odd-numbered single cells 110 are closed and the other control switches 21 are opened, the first voltage Vcello[2k-1] of the first single cell and the second voltage Vcello[2k] of the second single cell are acquired.

[0129] The set threshold includes a first set value and a second set value, wherein the first set value Vmax can be the maximum value of the appropriate range of the voltage of the set single cell 110, and the second set value Vmin can be the minimum value of the appropriate range of the voltage of the set single cell 110, and the second set value is smaller than the first set value.

[0130] 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, that is, when Vcello[2k - 1] < Vmin and Vcello[2k] > Vmax, it is determined that there is a break in the target line, that is, it is determined that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single cell.

[0131] Thus, when the first single cell is the single cell 110 with an odd order, the second single cell is the single cell 110 with the order one after the first single cell, 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 can be determined that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single cell, that is, it can be determined that there is a break in the voltage acquisition line 10 commonly connected to the first single cell and the second single cell.

[0132] In some embodiments, the set thresholds include 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 value of the single cell voltages 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.

[0133] Specifically, the average single cell voltage Vave is the average value of the voltages of the single cells 110 in the battery pack 1000, and is determined by dividing the sum of the total voltages of all the single cells 110 by the number of all the single cells 110, that is:

[0134]

[0135] where 1 ≤ i ≤ n. The voltage Vi of the single cell 110 can be obtained by turning off the control switches 21 of all the voltage acquisition sub - circuits 20 to make the battery pack 1000 in the third state and collecting the voltage of the single cell 110 at this time.

[0136] In one embodiment, the first set value Vmax is:

[0137] Vmax = 2×Vave - Vnpn

[0138] The second set value Vmin is:

[0139] Vmin = Vnpn + 0.5

[0140] where 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] In this way, the first set value can be determined according to the cell voltage average 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] See also Figure 6 In some embodiments, the set threshold includes a first set value and a second set value, the first set value is greater than the second set value, and when the first single cell is the 2kth single cell 110 and the second single cell is the 2k+1th single cell 110, step 03 (determining the disconnection state of the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage and the set threshold) 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 collection circuit 10 connected to the positive electrode of the first single battery is broken.

[0145] In some embodiments, the processor may be configured to determine that the voltage collection circuit 10 connected to the positive electrode of the first single cell is disconnected if the first voltage is greater than a first set value and the second voltage is less than a second set value in the first state.

[0146] In some embodiments, the first determination module includes a second determination submodule which can be used to determine that the voltage collection circuit 10 connected to the positive electrode of the first single cell is disconnected if the first voltage is greater than the first set value and the second voltage is less than the second set value in the first state.

[0147] Specifically, when 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 an even connection order in the battery pack 1000, and 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 to the negative electrode of the second single cell, and the target line shared by the first single cell and the second single cell connects the positive electrode of the first single cell and the negative electrode of the second single cell.

[0148] After closing the control switch 21 of the voltage acquisition sub - circuit 20 that controls the connection of all monomer cells 110 with odd orders and disconnecting the other control switches 21, the first voltage Vcello[2k] of the first monomer cell and the second voltage Vcello[2k + 1] of the second monomer cell are acquired at this time.

[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, that is, when Vcello[2k]>Vmax and Vcello[2k + 1]<Vmin, it is determined that there is a break in the target line, that is, it is determined that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer cell.

[0150] In this way, when the first monomer cell is a monomer cell 110 with an even order, the second monomer cell is a monomer cell 110 with an order one after the first monomer cell, 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 there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer cell, that is, it can be determined that there is a break in the voltage acquisition line 10 commonly connected by the first monomer cell and the second monomer cell.

[0151] Please refer to Figure 7 , in some embodiments, the battery pack 1000 includes a plurality of sequentially connected monomer cells 110, each monomer cell 110 corresponds to a voltage acquisition sub - circuit 20, and step 01 (controlling the control switch 21 of the voltage acquisition sub - circuit 20 to be closed or open) includes:

[0152] 013: Disconnect the control switch 21 of the first - sequence voltage acquisition sub - circuit. The first - sequence voltage acquisition sub - circuit includes the voltage acquisition sub - circuit 20 corresponding to the (2k - 1)th monomer cell 110 in the battery pack 1000;

[0153] 014: Close the control switch 21 of the second - sequence voltage acquisition sub - circuit. The second - sequence voltage acquisition sub - circuit includes the voltage acquisition sub - circuit 20 corresponding to the 2kth monomer cell 110 in the battery pack 1000 to make the battery pack 1000 in the second state, where k is an integer greater than or equal to 1;

[0154] Step 02 (acquiring the first voltage of the first monomer cell and the second voltage of the second monomer cell) includes:

[0155] 022: Acquire the first voltage of the first monomer cell in the second state and the second voltage of the second monomer cell in the second state.

[0156] In some embodiments, the processor can be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be disconnected, and the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2k-1th single cell 110 in the battery pack 1000; can be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to be closed, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2kth single cell 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 can be used to obtain a first voltage of the first single cell in the second state and a second voltage of the second single cell in the second state.

[0157] In some embodiments, the first control module includes a third control submodule and a fourth control submodule, and the first acquisition module includes a second acquisition submodule. The third control submodule can be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be disconnected, and the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2k-1th single cell 110 in the battery pack 1000; the fourth control submodule can be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to be closed, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2kth single cell 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 second acquisition submodule can be used to acquire the first voltage of the first single cell in the second state and the second voltage of the second single cell in the second state.

[0158] Specifically, the control switch 21 of the first sequence voltage acquisition subcircuit is controlled to be disconnected, and the control switch 21 of the second sequence voltage acquisition subcircuit is controlled to be closed, that is, the control switch 21 of the voltage acquisition subcircuit 20 corresponding to the single cells 110 with an odd order in the battery pack 1000 is controlled to be disconnected, and the control switch 21 of the voltage acquisition subcircuit 20 corresponding to the single cells 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] When the battery pack 1000 is in the second state, the first voltage of the first single cell and the second voltage of the second single cell are collected. As mentioned above, if the target line is broken, the first voltage and the second voltage will exceed the appropriate voltage range. Therefore, according to the collected first voltage, the second voltage and the set threshold value, it can be determined whether the voltage collection line 10 connected to the first single cell is broken.

[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 disconnected, the battery pack 1000 can be made to be in the second state. By collecting the voltages of the first monomer battery and the second monomer battery when they are in the second state and comparing them with the set threshold, it can be determined whether there is a break in the voltage acquisition line 10 connected to the first monomer battery.

[0161] Please refer to Figure 8 , in some embodiments, the set threshold includes a first set value and a second set value. When the first monomer battery is the 2k-th monomer battery 110 and the second monomer battery is the (2k + 1)-th monomer battery 110, step 03 (determining the disconnection state of the voltage acquisition channel 100 connected to the first monomer battery according to the first voltage, the second voltage, and the set threshold) 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 there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer battery.

[0163] In some embodiments, the processor can be used to determine that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer battery 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 determination module includes a third determination sub-module. The third determination sub-module can be used to determine that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer battery 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, when the first monomer battery is the 2k-th monomer battery 110, the second monomer battery is the (2k + 1)-th 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 collected.

[0166] When 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, that is, when Vcelle[2k] < Vmin and Vcelle[2k + 1] > Vmax, it is determined that there is a break in the target line, that is, it is determined that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first monomer battery.

[0167] Thus, when 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 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 there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single battery, that is, it can be determined that there is a break in the voltage acquisition line 10 commonly connected to the first single battery and the second single battery.

[0168] Please refer to Fig. 9 , in some embodiments, the set threshold includes a first set value and a second set value. When the first single battery is the (2k - 1)-th single battery 110 and the second single battery is the 2k-th single battery 110, step 03 (determining the break 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) 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 there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single battery.

[0170] In some embodiments, the processor can be used to determine that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single battery in the second state when 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 determination module includes a fourth determination sub-module. The fourth determination sub-module can be used to determine that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single battery in the second state when the first voltage is greater than the first set value and the second voltage is less than the second set value.

[0172] Specifically, when the first single battery is the (2k - 1)-th single battery 110, the second single battery is the 2k-th single battery 110, and the battery pack 1000 is in the second state, the first voltage Vcelle[2k - 1] of the first single battery and the second voltage Vcelle[2k] of the second single battery at this time are collected.

[0173] When 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, when Vcelle[2k - 1] > Vmax and Vcelle[2k] < Vmin, it is determined that there is a break in the target line, that is, it is determined that there is a break in the voltage acquisition line 10 connected to the positive electrode of the first single battery.

[0174] In this way, when the first single cell is an odd-numbered single cell 110 and the second single cell is a single cell 110 that is next to the first single cell, 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 circuit 10 connected to the positive electrode of the first single cell is broken, and it can be determined that the voltage collection circuit 10 connecting the first single cell and the second single cell is broken.

[0175] See also Fig.10 In some embodiments, the disconnection detection method further comprises:

[0176] 04: Control the control switches 21 of all the voltage acquisition sub-circuits 20 to be turned off, so that the battery pack 1000 is in the third state;

[0177] Step 02 (obtaining a first voltage of a first single cell and a second voltage of a second single cell) includes:

[0178] 023: Obtain a first voltage of the first single cell in a third state, and a second voltage of the second single cell in the third state.

[0179] In some embodiments, the processor can be used to disconnect the control switches 21 of all voltage acquisition subcircuits 20 to put the battery pack 1000 in the third state; and can be used to obtain the first voltage of the first single cell in the third state and the second voltage of the second single cell in the third state.

[0180] In some embodiments, the disconnection detection device further includes a second control module, and the first acquisition module further includes a third acquisition submodule. The second control module can be used to control the control switches 21 of all voltage acquisition subcircuits 20 to be disconnected so that the battery pack 1000 is in the third state; the third acquisition submodule can be used to acquire the first voltage of the first single cell in the third state, and the second voltage of the second single cell in the third state.

[0181] Specifically, the sampling chip 30 controls the control switches 21 of all the voltage acquisition 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 cell and the second voltage of the second single cell at this time. According to the first voltage, the second voltage and the set threshold at this time, it can be determined whether the voltage acquisition line 10 connected to the first single cell is broken.

[0182] When the battery pack 1000 is in the first state or the second state, the disconnection status of the voltage acquisition circuit 10 may not be accurately determined based on the first voltage, the second voltage and the set threshold value. For example, the abnormality of multiple consecutive disconnections of the voltage acquisition circuits 10 cannot be detected based on 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 may be judged again to adopt multiple methods to determine the disconnection status of the voltage acquisition circuit 10.

[0183] In this way, by disconnecting all the control switches 21, the battery pack 1000 can be placed in the third state, the first voltage and the second voltage at this time are collected, and based on the first voltage, the second voltage and the set threshold, it can be determined whether the voltage collection circuit 10 is broken.

[0184] See also Fig.11 In some embodiments, the battery pack includes a plurality of sequentially connected single cells, in which the second single cell is the previous single cell or the next single cell of the first single cell, the set threshold includes a positive first voltage threshold and a negative second voltage threshold, and step 03 (determining the disconnection state of the voltage acquisition circuit 10 connected to the first single cell according to the first voltage, the second voltage and the set threshold) includes:

[0185] 035: 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 is determined that the voltage acquisition circuit 10 connected to the positive electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage.

[0186] In some embodiments, the processor can be used to determine that there is a break in the voltage collection circuit 10 connected to the positive electrode of the first single cell battery 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 in the third state, and the target difference is the difference between the single cell voltage average and the voltage.

[0187] In some embodiments, the first determination module includes a fifth determination submodule. The fifth determination submodule can be used to determine that the voltage acquisition line 10 connected to the positive electrode of the first single cell is disconnected 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, and the target difference is the difference between the single cell voltage mean and the voltage.

[0188] Specifically, the first single cell is the i-th single cell 110 in the battery pack 1000, and the second single cell is the single cell 110 that is one cell before the first single cell in the battery pack 1000, or the next single cell 110, that is, the second single cell is the i-1-th single cell 110 in the battery pack 1000 or the i+1-th single cell 110 in the battery pack 1000. In the third state, the first voltage Vcell[i] of the first single cell and the second voltage (Vcell[i-1] or Vcell[i+1]) of the second single cell are collected.

[0189] The first voltage threshold Vdiff and the second voltage threshold -Vdiff are pre-set 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. Both can be set according to actual needs.

[0190] The target difference is the difference between the single cell voltage average Vave and the voltage Vcell, that is, 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, that is, when 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 cell 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 circuit 10 connected to the positive electrode of the first single cell is broken, and it can be determined that the voltage collection circuit 10 connecting the first single cell and the second single cell is broken.

[0192] See also Fig.12 In some embodiments, the battery pack includes a plurality of sequentially connected single cells, in which the second single cell is the previous single cell or the next single cell of the first single cell, the set threshold includes a positive first voltage threshold and a negative second voltage threshold, and step 03 (determining the disconnection state of the voltage acquisition circuit 10 connected to the first single cell according to the first voltage, the second voltage and the set threshold) includes:

[0193] 036: In the third state, if the target difference of the first voltage is less than the second voltage threshold, and the target difference of the second voltage is greater than the first voltage threshold, it is determined that the voltage acquisition circuit 10 connected to the positive electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage.

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

[0195] In some embodiments, the first determination module includes a sixth determination submodule. The sixth determination submodule can be used to determine that the voltage acquisition line 10 connected to the positive electrode of the first single cell is disconnected in the third state if the target difference of the first voltage is less than the second voltage threshold and the target difference of the second voltage is greater than the first voltage threshold, and the target difference is the difference between the single cell voltage mean and the voltage.

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

[0197] When the target difference of the first voltage is less than the second voltage threshold -Vdiff, and the target difference of the second voltage is greater than the first voltage threshold Vdiff, that is, when 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 cell is broken.

[0198] In one embodiment, if Vave-Vcell[2]<-Vdiff and Vave-Vcell[1]>Vdiff, it can be determined that the voltage collection circuit 10 of the positive electrode component of the second single battery 110 is broken.

[0199] 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 circuit 10 connected to the positive electrode of the first single cell is broken, and it can be determined that the voltage collection circuit 10 connecting the first single cell and the second single cell is broken.

[0200] See also Fig.13 In some embodiments, the battery pack 1000 includes a plurality of sequentially connected single cells 110, the set threshold includes a first voltage threshold value that is a positive value and a second set value, the first single cell is ranked first in the battery pack 1000, and the second single cell is ranked second in the battery pack 1000, step 03 (determining the disconnection state of the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage and the set threshold) includes:

[0201] 037: When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that the voltage collection circuit 10 connected to the negative electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage.

[0202] In some embodiments, the processor can be used to determine that there is a break in the voltage collection circuit 10 connected to the negative electrode of the first single cell when the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, and the target difference is the difference between the single cell voltage average and the voltage.

[0203] In some embodiments, the first determination module includes a seventh determination submodule. The seventh determination submodule can be used to determine that the voltage acquisition circuit 10 connected to the negative electrode of the first single cell is disconnected when the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, and the target difference is the difference between the single cell voltage mean and the voltage.

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

[0205] When the first voltage is less than the second set value Vmin and the target difference of the second voltage is greater than the first voltage threshold Vdiff, that is, when Vcell[1]<Vmin, Vave-Vcell[2]>Vdiff, it is determined that the voltage collection line 10 connected to the negative electrode (V1-) connected to the first single cell is broken.

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

[0207] See also Fig.14 In some embodiments, the battery pack 1000 includes m sequentially connected single cells 110, the set threshold includes a second set value and a positive first voltage threshold, and when the first single cell is ranked mth in the battery pack 1000 and the second single cell is ranked m-1th in the battery pack 1000, step 03 (determining the disconnection state of the voltage acquisition channel 100 connected to the first single cell according to the first voltage, the second voltage and the set threshold) includes:

[0208] 038: When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that the voltage acquisition circuit 10 connected to the positive electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage, where m is a positive integer greater than 1.

[0209] In some embodiments, the processor can be used to determine that there is a break in the voltage collection circuit 10 connected to the positive electrode of the first single cell when the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, and the target difference is the difference between the single cell voltage average and the voltage.

[0210] In some embodiments, the first determination module includes an eighth determination submodule. The eighth determination submodule can be used to determine that the voltage acquisition circuit 10 connected to the positive electrode of the first single cell is disconnected when the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, and the target difference is the difference between the single cell voltage mean and the voltage.

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

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

[0213] When the first voltage is less than the second set value Vmin and the target difference of the second voltage is greater than the first voltage threshold Vdiff, that is, when Vcell[m]<Vmin, Vave-Vcell[m-1]>Vdiff, it is determined that the voltage collection line 10 connected to the positive electrode of the first single cell is disconnected.

[0214] In some embodiments, the first single cell is the Nth single cell 110 of N single cells 110 connected to a sampling chip, and the second single cell is the N-1th single cell 110 connected to the same sampling chip. When Vcell[n]<Vmin, Vave-Vcell[n-1]>Vdiff, it is determined that the voltage collection line 10 connected to the positive electrode of the first single cell is disconnected.

[0215] In one embodiment, see Figure 2 , a sampling chip (AFE) samples the voltages of 16 cells 110, and the first cell is B16. When Vcell

[16] <Vmin, Vave-Vcell

[15] >Vdiff, the voltage collection circuit 10 connected to the positive electrode V16+ of B16 is disconnected.

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

[0217] See also Fig.15 In some embodiments, the battery pack 1000 includes a plurality of sequentially connected single cells 110. When it is determined that all voltage acquisition circuits 10 are not disconnected, the disconnection detection method further includes:

[0218] 05: Control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, and control the control switch 21 of the second sequence voltage acquisition subcircuit 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, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 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: According to the third voltage and the first target current, determine the line resistance state of the voltage acquisition circuit 10 connected to the 2k-1th single cell 110 in the battery pack 1000, wherein k is an integer greater than or equal to 1, and the first target current is determined according to the voltage of the 2k-1th single cell 110 in the third state or the average value of the single cell voltage. When the battery pack 1000 is in the third state, all control switches 21 are disconnected.

[0221] In some embodiments, the processor can be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, and control the control switch 21 of the second sequence voltage acquisition subcircuit to be opened; can be used to obtain the third voltage of the 2k-1th single cell 110 in the battery pack 1000; can be used to determine the first target current based on the third voltage; and can also be used to determine the line resistance state of the voltage acquisition circuit 10 connected to the 2k-1th single cell 110 in the battery pack 1000 based on the third voltage and the first target current, where k is an integer greater than or equal to 1.

[0222] In some embodiments, the disconnection detection device further includes a third control module, a second acquisition module, a second determination module, and a third determination module. The third control module may be used to control the control switch 21 of the first sequence voltage acquisition subcircuit to be closed, and control the control switch 21 of the second sequence voltage acquisition subcircuit to be disconnected; the second acquisition module may be used to acquire the third voltage of the 2k-1th single cell 110 in the battery pack 1000; the second determination module may be used to determine the first target current according to the third voltage; the third determination module may be used to determine the line resistance state of the voltage acquisition circuit 10 connected to the 2k-1th single cell 110 in the battery pack 1000 according to the third voltage and the first target current, wherein k is an integer greater than or equal to 1.

[0223] Specifically, the voltage acquisition subcircuit 20 of the embodiment of the present application can also be used to detect whether the line resistance of the voltage acquisition circuit 10 is too large. When it is determined that all voltage acquisition circuits 10 are broken, it is detected whether the voltage acquisition circuit 10 has a problem of excessive line resistance.

[0224] The control switches 21 of the voltage acquisition subcircuits 20 corresponding to all the single cells 110 with odd numbers can be controlled to be closed, and the control switches 21 of the voltage acquisition subcircuits 20 corresponding to all the single cells 110 with even numbers can be controlled to be opened, and the voltages of the single cells 110 with odd numbers at this time can be obtained as the third voltage Vcelle1.

[0225] The first target current can be determined based on the voltage of the 2k-1th single cell 110 when all control switches 21 are disconnected (the battery pack is in the third state) or the average single cell voltage. Based on the determined first target current and the third voltage, it can be determined whether the line resistance of the voltage acquisition circuit 10 connected to the odd-numbered single cells 110 is too large.

[0226] In this way, by closing the control switch 21 of the voltage collection subcircuit 20 corresponding to all the single cells 110 with odd numbers in order, the line resistance state of the voltage collection circuit 10 connected to all the single cells 110 with odd numbers in order can be detected.

[0227] See also Fig.16 In some embodiments, the voltage acquisition subcircuit 20 includes a plurality of resistors. When the control switch 21 of the voltage acquisition subcircuit 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. Step 07 (determining the line resistance state of the voltage acquisition circuit 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: 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;

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

[0230] In some embodiments, the processor can be used to determine a first reference voltage based on a first target current, the internal resistance of the control switch 21, and the resistance value of the resistor; and can be used to determine that the line resistance of the voltage collection circuit 10 connected to the 2k-1th single cell 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 determination module includes a ninth determination submodule and a tenth determination submodule. The ninth determination submodule can be used to determine the first reference voltage according to the first target current, the internal resistance of the control switch 21, and the resistance value of the resistor; the tenth determination submodule can be used to determine that the line resistance of the voltage acquisition circuit 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 a detection resistor and a pull-down resistor 24, wherein one voltage acquisition circuit includes a first detection resistor 22, a second detection resistor 23 and a 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] When the control switch 21 of the voltage acquisition subcircuit 20 corresponding to the odd-numbered single cells 110 is closed, the first detection resistor 22, the second detection resistor 23 and the control switch 21 of the voltage acquisition subcircuit 20 corresponding to the odd-numbered single cells 110 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 cell or the average voltage Vave of the single cell in the third state, the resistance value R1 of the first detection resistor 22 2k-1 , the resistance value R2 of the second detection resistor 23 2k-1 , Pull-down resistor 24R3 2k-1 The resistance value and the internal resistance of the control switch 21 The first target current can be determined

[0235]

[0236] Or the first target current for:

[0237]

[0238] 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 can be determined

[0239]

[0240] Wherein, Vadc is a preset sampling voltage error.

[0241] The first reference voltage is the voltage between the pull-down resistor 24 and the connection node between the control switch 21 and the two detection resistors. When forming the first target loop, if the line resistance of the voltage sampling line is too large, the collected third voltage will be small. If the third voltage is less than the first reference voltage, it can be regarded as the third voltage is too small. Therefore, when the third voltage is less than the first reference voltage Right now In this case, it is determined 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.

[0242] In this way, the first reference voltage can be determined according to the first target current, the internal resistance of the control switch 21 and the resistance value of the resistor. When the third voltage is less than the first reference voltage, it can be determined that the line resistance of the voltage acquisition circuit 10 connected to the odd-numbered single cells 110 in the battery pack 1000 is too large.

[0243] See also Fig.17 In some embodiments, the battery pack 1000 includes a plurality of sequentially connected single cells 110. When it is determined that all voltage acquisition circuits 10 are not disconnected, the disconnection detection method further includes:

[0244] 08: Control the control switch 21 of the first sequence voltage acquisition subcircuit to be opened, and control the control switch 21 of the second sequence voltage acquisition subcircuit to be closed, 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, and the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit 20 corresponding to the 2kth single battery 110 in the battery pack 1000;

[0245] 09: Obtaining the fourth voltage of the 2kth single battery 110 in the battery pack 1000;

[0246] 0110: According to the fourth voltage and the second target current, determine the line resistance state of the voltage acquisition circuit 10 connected to the 2kth single cell 110 in the battery pack 1000, wherein k is an integer greater than or equal to 1, and the second target current is determined according to the voltage of the 2kth single cell 110 in the third state or the average single cell voltage. When the battery pack 1000 is in the third state, all control switches 21 are disconnected.

[0247] In some embodiments, the processor can be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to close, and the second sequence voltage acquisition subcircuit includes a voltage acquisition subcircuit 20 corresponding to the 2kth single cell 110 in the battery pack 1000; can be used to obtain the fourth voltage of the 2kth single cell 110 in the battery pack 1000; can be used to determine the second target current based on the fourth voltage; can be used to determine the line resistance state of the voltage acquisition circuit 10 connected to the 2kth single cell 110 in the battery pack 1000 based on the fourth voltage and the second target current, wherein k is an integer greater than or equal to 1.

[0248] In some embodiments, the line break detection device further includes a fourth control module, a third acquisition module, a fourth determination module, and a fifth determination module. The fourth control module may be used to control the control switch 21 of the second sequence voltage acquisition subcircuit to close, and the second sequence voltage acquisition subcircuit includes a voltage acquisition subcircuit 20 corresponding to the 2kth single cell 110 in the battery pack 1000; the third acquisition module may be used to acquire the fourth voltage of the 2kth single cell 110 in the battery pack 1000; the fourth determination module may be used to determine the second target current according to the fourth voltage; and the fifth determination module may be used to determine the line resistance state of the voltage acquisition circuit 10 connected to the 2kth single cell 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.

[0249] Specifically, the control switch 21 of the voltage acquisition subcircuit 20 corresponding to all the single cells 110 with an even order is controlled to be closed, and the control switch 21 of the voltage acquisition subcircuit 20 corresponding to all the single cells 110 with an odd order is controlled to be opened, and the voltage of the single cells 110 with an even order at this time is obtained as the fourth voltage Vcelle1.

[0250] The second target current can be determined based on the voltage of the 2kth single cell 110 when all control switches 21 are disconnected (the battery pack is in the third state) or the average single cell voltage. Based on the determined second target current and the fourth voltage, it can be determined whether the line resistance of the voltage collection circuit 10 connected to the even-numbered single cells 110 is too large.

[0251] In this way, by closing the control switch 21 of the voltage collection subcircuit 20 corresponding to all the single cells 110 with even numbers in order, the line resistance state of the voltage collection circuit 10 connected to all the single cells 110 with even numbers in order can be detected.

[0252] See also Fig.18 In some embodiments, the voltage acquisition subcircuit 20 includes a plurality of resistors. When the control switch 21 of the voltage acquisition subcircuit 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. Step 0110 (determining the line resistance state of the voltage acquisition circuit 10 connected to the 2kth single battery 110 in the battery pack 1000 according to the fourth voltage and the second target current) includes:

[0253] 01101: Determine 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;

[0254] 01102: when the fourth voltage is less than the second reference voltage, it is determined 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.

[0255] In some embodiments, the processor can be used to determine a second reference voltage based on a second target current, the internal resistance of the control switch 21, and the resistance value of the resistor; and can be used to determine that the line resistance of the voltage collection circuit 10 connected to the 2kth single cell 110 in the battery pack 1000 is too large when the fourth voltage is less than the second reference voltage.

[0256] In some embodiments, the fifth determination module includes an eleventh determination submodule and a twelfth determination submodule. The eleventh determination submodule can be used to determine the second reference voltage according to the second target current, the internal resistance of the control switch 21, and the resistance value of the resistor; the twelfth determination submodule can be used to determine that the line resistance of the voltage acquisition circuit 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.

[0257] Specifically, when the control switch 21 of the voltage acquisition sub-circuit 20 corresponding to the even-numbered single cells 110 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 even-numbered single cells 110 form a second target loop, and the second target current is the current flowing through the second target loop.

[0258] According to the voltage Vcell of the single cell or the average voltage Vave of the single cell in the third state, 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 , Pull-down resistor 24R3 2k The resistance value and the internal resistance of the control switch 21 The first target current can be determined

[0259]

[0260] , or the second target current for:

[0261]

[0262] 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 can be determined

[0263]

[0264] Wherein, Vadc is a preset sampling voltage error.

[0265] The second reference voltage is the voltage between the pull-down resistor 24 and the connection node between the control switch 21 and the two detection resistors. When forming the second target loop, if the line resistance of the voltage sampling line is too large, the collected fourth voltage will be small. If the fourth voltage is less than the second reference voltage, it can be regarded as the fourth voltage is too small. Therefore, when the fourth voltage is less than the second reference voltage Right now In this case, it is determined 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.

[0266] 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. When the fourth voltage is less than the second reference voltage, it can be determined that the line resistance of the voltage collection circuit 10 connected to the single cells 110 with an even order in the battery pack 1000 is too large.

[0267] See also Fig.19 In some embodiments, the disconnection detection method further comprises:

[0268] 0120: Obtain the average voltage of all single cells 110;

[0269] 0130: When the average value of the single cell voltage is within the preset voltage range, determine to perform disconnection detection to determine the disconnection state of the voltage acquisition channel 100;

[0270] 0140: When the cell voltage average is outside the preset voltage range, it is determined not to perform the disconnection detection.

[0271] In some embodiments, the processor can be used to obtain the average cell voltage of all single cells 110; can be used to determine to perform a line break detection when the average cell voltage is within a preset voltage range to determine the line break state of the voltage acquisition circuit 10; can be used to determine not to perform a line break detection when the average cell voltage is outside the preset voltage range.

[0272] 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 may be used to acquire the average value of the cell voltages of all the cells 110; the sixth determination module may be used to determine to perform disconnection detection when the average value of the cell voltages is within a preset voltage range, so as to determine the disconnection state of the voltage acquisition circuit 10; the seventh determination module may be used to determine not to perform disconnection detection when the average value of the cell voltages is outside the preset voltage range.

[0273] Specifically, if the average value of the cell voltage of all the cells 110 is not within the preset voltage range, it can be considered that the cell 110 is not in a normal working state. Since the determination of the set threshold is related to the preset voltage range, if the average value of the cell voltage of the cell 110 is not within the preset voltage range, the disconnection state judgment based on the voltage of the cell 110 at this time and the set threshold is inaccurate. The average value of the cell voltage can be determined based on the voltage of the cell 110 in the third state.

[0274] Therefore, only when the average value of the single cell voltage 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. When the average value of the single cell voltage is outside the preset voltage range, the single cell 110 is not in a normal state, and it is determined not to perform the disconnection detection on the voltage acquisition circuit 10.

[0275] The preset voltage range is the voltage value range of the single cell 110 during normal operation, and can be determined according to the actual situation or type of the single cell 110 .

[0276] In one embodiment, the preset voltage range is [2000, 4500].

[0277] In this way, whether to detect the disconnection state can be determined based on the comparison result between the cell voltage average and the preset voltage range.

[0278] The embodiment of the present application provides a disconnection detection circuit 20000 of a voltage acquisition channel 100. The voltage acquisition channel 100 includes a voltage acquisition circuit and a voltage acquisition subcircuit. The disconnection detection circuit 20000 includes a voltage acquisition subcircuit 20 and a sampling chip 30. The voltage acquisition circuit 10 connects a single cell 110 of a battery pack 1000 and a voltage acquisition subcircuit 20 corresponding to the single cell 110. The voltage acquisition subcircuit 20 is configured to acquire the voltage of the corresponding single cell 110 through the voltage acquisition circuit 10 and input it to the sampling chip 30. The single cell 110 includes a first single cell and a second single cell adjacent to the first single cell. The sampling chip 30 is configured as follows:

[0279] Controlling the control switch 21 of the voltage acquisition subcircuit 20 to be closed or opened;

[0280] Collecting a first voltage of a first single cell and a second voltage of a second single cell;

[0281] The disconnection state of the voltage collection circuit 10 connected to the first single battery is determined according to the first voltage, the second voltage and the set threshold.

[0282] The above explanation of the disconnection detection method in the embodiment of the present application is also applicable to the disconnection detection circuit 20000 in the embodiment of the present application, and will not be repeated here.

[0283] In some embodiments, the voltage acquisition circuit 10 connected to the same single cell 110 includes a first voltage acquisition circuit and a second voltage acquisition circuit, the positive electrode of the single cell 110 is connected to the first voltage acquisition circuit, the negative electrode of the single cell 110 is connected to the second voltage acquisition circuit, the single cell 110 is connected to the voltage acquisition sub-circuit 20 through the first voltage acquisition circuit and the second voltage acquisition circuit, the voltage acquisition 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 acquisition circuit and the second voltage acquisition circuit, the first pole of the control switch 21 is connected to the first voltage acquisition circuit through the first detection resistor 22, the second pole of the control switch 21 is connected to the second voltage acquisition 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, and the control port is configured to control the on and off of the control switch 21.

[0284] Specifically, the first detection resistor 22 is used to connect the first voltage acquisition circuit connected to the positive electrode of the single battery 110 corresponding to the voltage acquisition subcircuit 20, and the second detection resistor 23 is used to connect the second voltage acquisition 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 and 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, and the target current flowing through the target loop can be used to determine the line resistance state of the voltage acquisition circuit 10.

[0285] In this way, by setting 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 to determine the line resistance state of the voltage acquisition circuit 10 .

[0286] In some embodiments, the voltage acquisition subcircuit 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, and 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 cell 110.

[0287] Specifically, the first sampling resistor R4 n One end of the first sampling resistor R4 is connected to the first voltage collection circuit through the first detection resistor 22. n The other end of the sampling capacitor 27 is connected to the first sampling port of the sampling chip 30, and the second sampling resistor R5n One end of the second voltage collection circuit is connected to the second detection resistor 23, and the second sampling resistor R5 n The other end of the sampling capacitor Cn is connected to the second sampling port of the sampling chip 30. 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. The capacitor voltage of the sampling capacitor 27 can represent the voltage of the corresponding single battery 110. The voltage acquisition subcircuit 20 also includes a current limiting resistor R6 n .

[0288] In this way, the first sampling port and the second sampling port of the sampling chip 30 can collect the voltage of the correspondingly connected single battery 110 through the first sampling resistor 25 and the second sampling resistor 26 to achieve voltage collection, and the disconnection state of the voltage collection circuit 10 can be determined based on the collected voltage of the single battery 110.

[0289] An embodiment of the present application provides a vehicle, the vehicle comprising a disconnection detection circuit 20000 according to any one of the above embodiments or an electronic device according to the above embodiments.

[0290] The embodiments of the present application provide a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the disconnection detection method of any of the above embodiments are implemented.

[0291] It is understood that a computer program includes computer program code. The computer program code may be in source code form, object code form, executable file or some intermediate form. Computer readable storage media may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution medium.

[0292] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0293] In addition, the term "connection" should be understood in a broad sense, for example, it can include fixed connection, detachable connection, or integral connection; it can include direct connection, indirect connection through an intermediate medium, and internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0294] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0295] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0296] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for detecting disconnection of a voltage acquisition channel, characterized in that: The voltage acquisition channel includes a voltage acquisition circuit and a voltage acquisition subcircuit, the voltage acquisition circuit connects a single cell of a battery pack and the voltage acquisition subcircuit corresponding to the single cell, the voltage acquisition subcircuit is configured to acquire the voltage of the corresponding single cell through the voltage acquisition circuit, the single cell includes a first single cell and a second single cell adjacent to the first single cell, and the disconnection detection method includes: Controlling the control switch of the voltage acquisition subcircuit to close or open; Acquire a first voltage of the first single cell and a second voltage of the second single cell; The disconnection state of the voltage collection channel connected to the first single battery is determined according to the first voltage, the second voltage and a set threshold.

2. The disconnection detection method according to claim 1, characterized in that: The battery pack includes a plurality of single cells connected in sequence, each of the single cells corresponds to one of the voltage collection sub-circuits, and the control switch controlling the voltage collection sub-circuits to be closed or opened includes: Controlling a control switch of a first sequence voltage acquisition subcircuit to be closed, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single cell in the battery pack; Controlling the control switch of the second sequence voltage acquisition subcircuit to be turned off, the second sequence voltage acquisition subcircuit including the voltage acquisition subcircuit corresponding to the 2kth single battery in the battery pack, so that the battery pack is in the first state, wherein k is an integer greater than or equal to 1; The obtaining of the first voltage of the first single cell and the second voltage of the second single cell includes: A first voltage of the first single cell in the first state and a second voltage of the second single cell in the first state are obtained.

3. The disconnection detection method according to claim 2, characterized in that: 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 when the first single cell is the 2k-1th single cell and the second single cell is the 2kth single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold value includes: 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

4. The disconnection detection method according to claim 2, characterized in that: 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 when the first single cell is the 2kth single cell and the second single cell is the 2k+1th single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold value includes: 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

5. The disconnection detection method according to claim 1, characterized in that: The battery pack includes a plurality of single cells connected in sequence, each of the single cells corresponds to one of the voltage collection sub-circuits, and the control switch controlling the voltage collection sub-circuits to be closed or opened includes: Controlling the control switch of the first sequence voltage acquisition subcircuit to be turned off, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single battery in the battery pack; Controlling a control switch of a second sequence voltage acquisition subcircuit to be closed, wherein 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; The obtaining of the first voltage of the first single cell and the second voltage of the second single cell includes: A first voltage of the first single cell in the second state and a second voltage of the second single cell in the second state are acquired.

6. The disconnection detection method according to claim 5, characterized in that: The set threshold value includes a first set value and a second set value. When the first single cell is the 2kth single cell and the second single cell is the 2k+1th single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold value includes: In the second state, if the first voltage is less than a second set value and the second voltage is greater than the first set value, it is determined that a voltage collection circuit connected to the positive electrode of the first single battery is broken.

7. The disconnection detection method according to claim 5, characterized in that: The set threshold value includes a first set value and a second set value. When the first single cell is the 2k-1th single cell and the second single cell is the 2kth single cell, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set 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 a voltage collection circuit connected to the positive electrode of the first single battery is broken.

8. The disconnection detection method according to claim 1, characterized in that: The disconnection detection method further comprises: Controlling the control switches of all the voltage acquisition sub-circuits to be disconnected so that the battery pack is in a third state; The obtaining of the first voltage of the first single cell and the second voltage of the second single cell comprises: A first voltage of the first single cell in the third state and a second voltage of the second single cell in the third state are acquired.

9. The disconnection detection method according to claim 8, characterized in that: The battery pack includes a plurality of sequentially connected single cells, in which the second single cell is a previous single cell or a subsequent single cell of the first single cell, the set threshold includes a positive first voltage threshold and a negative second voltage threshold, and determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold, includes: 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 is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage.

10. The disconnection detection method according to claim 8, characterized in that: The battery pack includes a plurality of sequentially connected single cells, in which the second single cell is a previous single cell or a subsequent single cell of the first single cell, the set threshold includes a positive first voltage threshold and a negative second voltage threshold, and determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold, includes: In the third state, if the target difference of the first voltage is less than the second voltage threshold, and the target difference of the second voltage is greater than the first voltage threshold, it is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage.

11. The disconnection detection method according to claim 8, characterized in that: The battery pack includes a plurality of sequentially connected single cells, the set threshold includes a first voltage threshold value and a second set value that are positive values, and when the first single cell is ranked first in the battery pack and the second single cell is ranked second in the battery pack, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold value includes: When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that the voltage collection circuit connected to the negative electrode of the first single cell is broken, and the target difference is the difference between the single cell voltage average and the voltage.

12. The disconnection detection method according to claim 8, characterized in that: The battery pack includes m sequentially connected single cells, the set threshold includes a second set value and a positive first voltage threshold, and when the first single cell is ranked mth in the battery pack and the second single cell is ranked m-1th in the battery pack, determining the disconnection state of the voltage acquisition channel connected to the first single cell according to the first voltage, the second voltage and the set threshold includes: When the first voltage is less than the second set value and the target difference of the second voltage is greater than the first voltage threshold, it is determined that there is a break in the voltage collection circuit connected to the positive electrode of the first single cell, and the target difference is the difference between the single cell voltage average and the voltage, where m is a positive integer greater than 1.

13. The disconnection detection method according to claim 1, characterized in that: The battery pack includes a plurality of sequentially connected single cells. When it is determined that all the voltage acquisition lines are not disconnected, the disconnection detection method further includes: Controlling a control switch of a first sequence voltage acquisition subcircuit to be closed, wherein the first sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2k-1th single cell in the battery pack; Obtaining a third voltage of the 2k-1th single cell in the battery pack; Based on the third voltage and the first target current, the line resistance state of the voltage acquisition circuit connected to the 2k-1th single cell in the battery pack is determined, wherein k is an integer greater than or equal to 1, and the first target current is determined based on the voltage of the 2k-1th single cell in the third state or the average of the single cell voltages, and when the battery pack is in the third state, all the control switches are disconnected.

14. The disconnection detection method according to claim 13, characterized in that: The voltage acquisition subcircuit includes a plurality of resistors. When a control switch of the voltage acquisition subcircuit is closed, the resistors, the single battery and the control switch form a first target loop. The first target current is a current in the first target loop. The determining, according to the third voltage and the first target current, a line resistance state of a voltage acquisition circuit connected to the 2k-1th single battery in the battery pack includes: determining a first reference voltage according to the first target current, the internal resistance of the control switch and the resistance value of the resistor; When the third voltage is less than the first reference voltage, it is determined that the line resistance of the voltage acquisition line connected to the 2k-1th single battery in the battery pack is too large.

15. The disconnection detection method according to claim 1, characterized in that: The battery pack includes a plurality of sequentially connected single cells. When it is determined that all the voltage acquisition lines are not disconnected, the disconnection detection method further includes: Controlling a control switch of a second sequence voltage acquisition subcircuit to be closed, wherein the second sequence voltage acquisition subcircuit includes the voltage acquisition subcircuit corresponding to the 2kth single battery in the battery pack; Acquire a fourth voltage of the 2kth single cell in the battery pack; According to the fourth voltage and the second target current, the line resistance state of the voltage collection circuit connected to the 2kth single cell in the battery pack is determined, wherein k is an integer greater than or equal to 1, and the second target current is determined based on the voltage of the 2kth single cell in the third state or the average of the single cell voltages, and when the battery pack is in the third state, all the control switches are disconnected.

16. The disconnection detection method according to claim 15, characterized in that: The voltage acquisition subcircuit includes a plurality of resistors. When a control switch of the voltage acquisition subcircuit is closed, the resistors, the single cells and the control switch form a second target loop. The second target current is a current in the second target loop. The determining, according to the fourth voltage and the second target current, a line resistance state of a voltage acquisition circuit connected to the 2kth single cell in the battery pack includes: 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; When the fourth voltage is less than the second reference voltage, it is determined that the line resistance of the voltage acquisition line connected to the 2kth single battery in the battery pack is too large.

17. The disconnection detection method according to claim 1, characterized in that: The disconnection detection method further comprises: Obtaining the average value of the single cell voltage of all the single cells; When the monomer voltage mean value is within a preset voltage range, determining to perform disconnection detection to determine the disconnection state of the voltage acquisition channel; When the cell voltage average value is outside the preset voltage range, it is determined not to perform the disconnection detection.

18. The disconnection detection method according to claim 1, characterized in that: The set threshold includes a first set value and a second set value, the second set value is smaller than the first set value, the first set value is determined based on the cell voltage average and the voltage drop of the control switch, and the second set value is determined based on the voltage drop of the control switch.

19. A disconnection detection circuit for a voltage acquisition channel, characterized in that: The voltage acquisition channel includes a voltage acquisition circuit and a voltage acquisition subcircuit, the disconnection detection circuit includes a voltage acquisition subcircuit and a sampling chip, the voltage acquisition circuit connects the single cell of the battery pack and the voltage acquisition subcircuit corresponding to the single cell, the voltage acquisition subcircuit is configured to acquire the voltage of the corresponding single cell through the voltage acquisition circuit and input it to the sampling chip, the single cell includes a first single cell and a second single cell adjacent to the first single cell, and the sampling chip is configured as follows: Controlling the control switch of the voltage acquisition subcircuit to close or open; collecting a first voltage of the first single cell and a second voltage of the second single cell; The disconnection state of the voltage collection channel connected to the first single battery is determined according to the first voltage, the second voltage and a set threshold.

20. The disconnection detection circuit according to claim 19, characterized in that: The positive electrode of the single cell is connected to the first voltage acquisition circuit, the negative electrode of the single cell is connected to the second voltage acquisition circuit, the single cell is connected to the voltage acquisition sub-circuit through the first voltage acquisition circuit and the second voltage acquisition circuit, the voltage acquisition sub-circuit includes a first detection resistor, a second detection resistor and the control switch, the control switch is arranged between the first voltage acquisition circuit and the second voltage acquisition circuit, the first electrode of the control switch is connected to the first voltage acquisition circuit through the first detection resistor, the second electrode of the control switch is connected to the second voltage acquisition circuit through the second detection resistor, the control electrode of the control switch is connected to the control port of the sampling chip, and the control port is configured to control the on and off of the control switch.

21. The disconnection detection circuit according to claim 20, characterized in that: 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.

22. The disconnection detection circuit according to claim 20, characterized in that: The voltage acquisition subcircuit further includes a first sampling resistor and a second sampling resistor, wherein the first detection resistor is connected to a first sampling port of the sampling chip through the first sampling resistor, and the second detection resistor is connected to a second sampling port of the sampling chip through the second sampling resistor, and the first sampling port and the second sampling port are configured to acquire the voltage of the single cell.

23. An electronic device, characterized in that: The electronic device includes one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the disconnection detection method according to any one of claims 1 to 18 are implemented.

24. A vehicle, characterized in that: The vehicle comprises the wire break detection circuit according to any one of claims 19 to 22 or the electronic device according to claim 23.

25. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the disconnection detection method according to any one of claims 1 to 18 are implemented.

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