Determination Method, Device, Storage Medium and Main Control Board for Disconnection of Acquisition Line

Abstract

An embodiment of the present invention provides a method, apparatus, storage medium, and main control board for determining a broken acquisition line. The method includes: if at least one first single cell with a single cell voltage less than a first threshold is selected from multiple single cells, determining that the acquisition line corresponding to at least one first single cell is broken; according to the first state of the battery pack and the single cell parameters of multiple single cells, screening at least one third single cell from at least one second single cell other than the first single cell among multiple single cells, where the single cell parameters of the third single cell are within the threshold range corresponding to the single cell parameters; determining that the acquisition line corresponding to at least one third single cell is broken, thereby improving the accuracy of determining a broken acquisition line.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of battery processing, and particularly to a method, a device, a storage medium and a main control board for determining a disconnection of a collection line.

Background Art

[0002] In the prior art, when the monomer voltage is greater than a first reference threshold or less than a second reference threshold, the main control board can determine that the collection line corresponding to the monomer is disconnected. Alternatively, when the longitudinal pressure difference between monomers is greater than a third reference threshold, the main control board can also determine that the collection line corresponding to the monomer is disconnected. For example, when the monomer voltage of a monomer battery is 0V, the main control board determines that the collection line corresponding to the monomer battery is disconnected. However, when the consistency of the battery pack is poor, a large current will cause the monomer voltage of some monomer batteries to be transiently greater than the first reference threshold or less than the second reference threshold, or the longitudinal pressure difference between monomers is greater than the third reference threshold. At this time, the collection line corresponding to the monomer battery may not be disconnected, but due to the influence of the large current, the main control board determines that the collection line corresponding to the monomer battery is disconnected, thereby reducing the accuracy of the main control board in determining the disconnection of the collection line.

Summary of the Invention

[0003] In view of this, the embodiments of the present invention provide a method, a device, a storage medium and a main control board for determining a disconnection of a collection line, so as to solve the problem of low accuracy in determining the disconnection of a collection line in the prior art.

[0004] In a first aspect, the embodiments of the present invention provide a method for determining a disconnection of a collection line. The method is applied to the main control board of a battery pack, and the battery pack further includes a plurality of monomer batteries. The method includes:

[0005] If at least one first monomer battery with a monomer voltage less than a first threshold is selected from the plurality of monomer batteries, it is determined that the collection lines corresponding to the at least one first monomer battery are disconnected;

[0006] According to the first state of the battery pack and the monomer parameters of the plurality of monomer batteries obtained, at least one third monomer battery is selected from at least one second monomer battery other than the first monomer battery among the plurality of monomer batteries, and the monomer parameters of the third monomer battery are within the threshold range corresponding to the monomer parameters;

[0007] It is determined that the collection lines corresponding to the at least one third monomer battery are disconnected.

[0008] In a possible implementation manner, the monomer parameters include a first monomer parameter or a second monomer parameter. Selecting at least one third monomer battery from at least one second monomer battery other than the first monomer battery among the plurality of monomer batteries includes:

[0009] If it is determined that the first state is the charging state, at least one second single cell whose first single cell parameter is within the first screening threshold range is selected from the at least one second single cell, and the second single cell whose first single cell parameter is within the first screening threshold range is used as the third single cell;

[0010] If it is determined that the first state is the discharging state, at least one second single cell whose second single cell parameter is within the second screening threshold range is selected from the at least one second single cell, and the second single cell whose second single cell parameter is within the second screening threshold range is used as the third single cell.

[0011] In a possible implementation manner, the first screening threshold range includes a range where the first single cell parameter is less than a second threshold, the first single cell parameter includes a longitudinal pressure difference between single cells, and the step of selecting at least one second single cell whose first single cell parameter is within the first screening threshold range from the at least one second single cell and using the second single cell whose first single cell parameter is within the first screening threshold range as the third single cell includes:

[0012] Determine whether the longitudinal pressure difference between single cells of the at least one second single cell is greater than or equal to the second threshold;

[0013] If it is determined that the longitudinal pressure difference between single cells of any one of the second single cells is less than the second threshold, the second single cell with the longitudinal pressure difference between single cells less than the second threshold is used as the third single cell;

[0014] If it is determined that the longitudinal pressure difference between single cells of the at least one second single cell is greater than or equal to the second threshold, the numbers of at least one second single cell are added to the second battery group parameter according to the current and temperature of the obtained battery pack.

[0015] In a possible implementation manner, the second single cell parameter includes a single cell voltage, the second screening threshold range includes a range where the single cell voltage is greater than a third threshold, and the step of selecting at least one second single cell whose second single cell parameter is within the second screening threshold range from the at least one second single cell and using the second single cell whose second single cell parameter is within the second screening threshold range as the third single cell includes:

[0016] Determine whether the single cell voltage of the at least one second single cell is less than or equal to the third threshold;

[0017] If it is determined that the cell voltage of any one of the second single cells is greater than the third threshold, then the second single cell with the cell voltage greater than the third threshold is used as the third single cell;

[0018] If it is determined that the cell voltage of the at least one second single cell is less than or equal to the third threshold, then it is determined whether the first battery pack parameters obtained include the numbers of at least two consecutive single cells or the numbers of at least one marginal single cell, and the second single cell parameters further include the numbers of the single cells;

[0019] If it is determined that the first battery pack parameters include the numbers of at least two consecutive single cells and / or the numbers of at least one marginal single cell, then it is determined whether the first battery pack parameters, the obtained second battery pack parameters, and the third battery pack parameters include the common number of at least one single cell. Both the second battery pack parameters and the third battery pack parameters include the numbers of at least one single cell, and the common number is the same number among the first battery pack parameters, the second battery pack parameters, and the third battery pack parameters;

[0020] If it is determined that the first battery pack parameters do not include the common number, then the at least two consecutive single cells are used as the third single cell and / or at least one marginal single cell is used as the third single cell. The second screening threshold range also includes the range where the number of the single cell is the number of any one of the two consecutive single cells in the first battery pack parameters and / or the number of at least one marginal single cell.

[0021] In a possible implementation manner, the method further includes:

[0022] If it is determined that the first battery pack parameters do not include the numbers of any two consecutive single cells and the numbers of any one marginal single cell, then according to the current and temperature of the obtained battery pack, the numbers of at least one second single cell are added to the third battery pack parameters.

[0023] In a possible implementation manner, the method further includes:

[0024] If it is determined that the first battery pack parameters include the common number, then according to the lowest cell voltage among the at least one single cell voltage, the output power of the battery pack is reduced to the set power;

[0025] Send a disconnection diagnosis instruction to the daughter board so that the daughter board determines whether the acquisition lines corresponding to at least one second single cell other than the third single cell in the at least one second single cell are disconnected according to the disconnection diagnosis instruction.

[0026] In a possible implementation, adding the numbers of at least one second single cell to the second battery pack parameter according to the obtained current and temperature of the battery pack includes:

[0027] Determining whether the obtained current of the battery pack is within the charging current range and whether the obtained temperature of the battery pack is within the first temperature threshold range;

[0028] If it is determined that the obtained current of the battery pack is within the charging current range and the obtained temperature of the battery pack is within the first temperature threshold range, obtaining a first number of maximum charging longitudinal voltage differences from the longitudinal voltage differences of the second single cells other than the third single cell among at least one second single cell;

[0029] Obtaining the first numbers of the single cells corresponding to the first number of maximum charging longitudinal voltage differences;

[0030] Adding the first numbers of the first numbers to the second battery pack parameter.

[0031] In a possible implementation, adding the numbers of at least one second single cell to the third battery pack parameter according to the obtained current and temperature of the battery pack includes:

[0032] Determining whether the current of the battery pack is within the discharging current range and whether the obtained temperature of the battery pack is within the second temperature threshold range;

[0033] If it is determined that the current of the battery pack is within the discharging current range and the temperature of the battery pack is within the second temperature threshold range, obtaining a second number of maximum discharging longitudinal voltage differences from the longitudinal voltage differences of the second single cells corresponding to at least one second single cell whose single cell voltage is less than or equal to the third threshold;

[0034] Obtaining the second numbers of the single cells corresponding to the second number of maximum discharging longitudinal voltage differences;

[0035] Adding the second numbers of the second numbers to the third battery pack parameter.

[0036] In a possible implementation, reducing the output power of the battery pack to a set power according to the lowest single cell voltage among the single cell voltages of at least one single cell includes:

[0037] Determining whether the lowest single cell voltage among the single cell voltages of at least one second single cell other than the third single cell in the obtained at least one second single cell is less than the fault threshold;

[0038] If it is determined that the lowest single - cell voltage is less than the fault threshold, the output power of the battery pack is reduced to the set power.

[0039] In a possible implementation manner, before determining whether the first battery - pack parameters obtained by the determination include the numbers of at least two consecutive single - cells or the numbers of at least one marginal single - cell, it further includes:

[0040] Determine whether the second state of the battery pack is the state of initial power - on;

[0041] If it is determined that the second state of the battery pack is the state of initial power - on, obtain second battery - pack parameters and third battery - pack parameters;

[0042] If it is determined that the second state of the battery pack is not the state of initial power - on, obtain a third number of the smallest single - cell voltages from the multiple single - cell voltages;

[0043] Obtain the third numbers of the single - cells corresponding to the third number of the smallest single - cell voltages;

[0044] Add the third numbers of the third numbers to the first battery - pack parameters.

[0045] In a possible implementation manner, after determining that the acquisition line corresponding to the single - cell is broken, it further includes:

[0046] Reduce the output power of the battery pack to the set power.

[0047] In a second aspect, an embodiment of the present invention provides a battery pack, which includes a main control board and multiple single - cells;

[0048] The main control board is configured to, if at least one first single - cell whose single - cell voltage is less than a first threshold is screened out from the multiple single - cells, determine that the acquisition line corresponding to at least one of the first single - cells is broken; according to the obtained first state of the battery pack and the single - cell parameters of the multiple single - cells, screen out at least one third single - cell from at least one second single - cell other than the first single - cells among the multiple single - cells, where the single - cell parameters of the third single - cell are within the threshold range corresponding to the single - cell parameters; and determine that the acquisition line corresponding to at least one of the third single - cells is broken.

[0049] In a third aspect, an embodiment of the present invention provides a determination device for a broken acquisition line, including:

[0050] A first determination module, configured to, if at least one first single - cell whose single - cell voltage is less than a first threshold is screened out from the multiple single - cells, determine that the acquisition line corresponding to at least one of the first single - cells is broken;

[0051] A screening module, configured to screen at least one third single battery from at least one second single battery other than the first single battery among the multiple single batteries according to the first state of the battery pack and the single parameters of the multiple single batteries, where the single parameters of the third single battery are within the threshold range corresponding to the single parameters;

[0052] A second determination module, configured to determine that the acquisition line corresponding to the at least one third single battery is disconnected.

[0053] In a fourth aspect, an embodiment of the present invention provides a storage medium, where the storage medium includes a stored program, and when the program runs, it controls the device where the storage medium is located to execute the method for determining a disconnection of an acquisition line in the first aspect or any possible implementation manner of the first aspect.

[0054] In a fifth aspect, an embodiment of the present invention provides a main control board, including a memory and a processor, where the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the method for determining a disconnection of an acquisition line in the above first aspect or any possible implementation manner of the first aspect are implemented.

[0055] In the technical solutions of a method, device, storage medium, and main control board for determining a disconnection of an acquisition line provided by the embodiments of the present invention, if at least one first single battery with a single battery voltage less than a first threshold is screened out from multiple single batteries, it is determined that the acquisition line corresponding to the at least one first single battery is disconnected; according to the first state of the battery pack and the single parameters of the multiple single batteries, at least one third single battery is screened out from at least one second single battery other than the first single battery among the multiple single batteries, and the single parameters of the third single battery are within the threshold range corresponding to the single parameters; it is determined that the acquisition line corresponding to the at least one third single battery is disconnected, thereby improving the accuracy of determining a disconnection of an acquisition line.

Description of the Drawings

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0057] Figure 1 A schematic diagram of a battery pack provided by an embodiment of the present invention;

[0058] Figure 2 A flowchart of a method for determining a disconnection of an acquisition line provided by an embodiment of the present invention;

[0059] Figure 3 Flow chart of another method for determining disconnection of the acquisition line provided by an embodiment of the present invention;

[0060] Figure 4 Flow chart of a method for determining the third single battery provided by an embodiment of the present invention;

[0061] Figure 5 Flow chart of a method for updating the parameters of the second battery pack provided by an embodiment of the present invention;

[0062] Figure 6 Flow chart of another method for determining the third single battery provided by an embodiment of the present invention;

[0063] Figure 7 Flow chart of a method for obtaining the parameters of the battery pack provided by an embodiment of the present invention;

[0064] Figure 8 Flow chart of a method for updating the parameters of the third battery pack provided by an embodiment of the present invention;

[0065] Figure 9 Flow chart of a method for reducing the output power of the battery pack provided by an embodiment of the present invention;

[0066] Figure 10 Structural schematic diagram of a device for determining disconnection of the acquisition line provided by an embodiment of the present invention;

[0067] Figure 11 Schematic diagram of a main control board provided by an embodiment of the present invention.

Detailed implementation manners

[0068] For a better understanding of the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0069] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0070] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0071] It should be understood that the term "and / or" used herein is merely a description of the associated relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0072] It should be understood that although terms such as first, second, and third may be used to describe numbers in the embodiments of the present invention, these numbers should not be limited to these terms. These terms are only used to distinguish numbers from each other. For example, without departing from the scope of the embodiments of the present invention, the first number may also be referred to as the second number, and similarly, the second number may also be referred to as the first number.

[0073] Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0074] Figure 1 Schematic diagram of a battery pack provided for the embodiments of the present invention, as Figure 1 shown, the battery pack includes a main control board 1 and a plurality of single cells. The plurality of single cells include single cell A11, single cell A21,..., single cell Amn. Among them, the number of single cells is an integer greater than 1, and the arrangement of the single cells can be arranged in a horizontal row and / or a vertical row. The battery pack also includes a sub-board 2. Each single cell is connected to the sub-board 2. Each single cell is connected to the sub-board 2 through two lines, one line is the positive line, and the other line is the negative line. The line connecting two single cells to the sub-board 2 is both the positive line of one single cell and the negative line of another single cell. For example, when the left line of single cell A12 is the positive line of single cell A12, the right line of single cell A12 is the negative line of single cell A12; at the same time, the left line of single cell A12 is the negative line of single cell A11, and the right line of single cell A12 is the positive line of single cell A13. The main control board 1 is connected to the sub-board 2. For example, the main control board 1 is connected to the sub-board 2 through a communication line, and the sub-board 2 sends relevant information to the main control board through the communication line. The relevant information includes the single cell voltage of the single cell, the number of the single cell, the state of the battery pack, the temperature of the battery pack, etc.

[0075] The main control board 1 is configured to determine that the acquisition line corresponding to at least one first single cell is disconnected if at least one first single cell whose single cell voltage is less than the first threshold is selected from multiple single cells; according to the obtained first state of the battery pack and the single cell parameters of the multiple single cells, at least one third single cell is selected from at least one second single cell other than the first single cells among the multiple single cells, and the single cell parameters of the third single cells are within the threshold range corresponding to the single cell parameters; and determine the single cells with disconnected acquisition lines corresponding to at least one third single cell.

[0076] In an embodiment of the present invention, the single cell parameters include first single cell parameters or second single cell parameters. Specifically, the main control board 1 is configured to, if it is determined that the first state is a charging state, select at least one second single cell whose first single cell parameters are within the first screening threshold range from at least one second single cell, and use the second single cell whose first single cell parameters are within the first screening threshold range as the third single cell; if it is determined that the first state is a discharging state, select at least one second single cell whose second single cell parameters are within the second screening threshold range from at least one second single cell, and use the second single cell whose second single cell parameters are within the second screening threshold range as the third single cell.

[0077] In an embodiment of the present invention, the first screening threshold range includes a range where the first single cell parameter is less than the second threshold, and the first single cell parameter includes the longitudinal pressure difference of the single cell. Specifically, the main control board 1 is configured to determine whether the longitudinal pressure difference of at least one second single cell is greater than or equal to the second threshold; if it is determined that the longitudinal pressure difference of any one second single cell is less than the second threshold, use the second single cell with a longitudinal pressure difference less than the second threshold as the third single cell; if it is determined that the longitudinal pressure difference of at least one second single cell is greater than or equal to the second threshold, add the numbers of at least one second single cell to the second battery pack parameters according to the obtained current and temperature of the battery pack.

[0078] In an embodiment of the present invention, the second monomer parameter includes the monomer voltage, the second screening threshold range includes the range where the monomer voltage is less than the third threshold. The main control board 1 is specifically configured to determine whether the monomer voltage of at least one second monomer battery is less than or equal to the third threshold; if it is determined that the monomer voltage of any second monomer battery is greater than the third threshold, the second monomer battery with the monomer voltage greater than the third threshold is used as the third monomer battery; if it is determined that the monomer voltage of at least one second monomer battery is less than or equal to the third threshold, it is determined whether the first battery pack parameter obtained includes the numbers of at least two consecutive monomer batteries or the numbers of at least one marginal monomer battery. The second monomer parameter further includes the numbers of the monomer batteries; if it is determined that the first battery pack parameter includes the numbers of at least two consecutive monomer batteries and / or the numbers of at least one marginal monomer battery, it is determined whether the first battery pack parameter, the obtained second battery pack parameter, and the third battery pack parameter include the common number of at least one monomer battery. Both the second battery pack parameter and the third battery pack parameter include the numbers of at least one monomer battery, and the common number is the same number in the first battery pack parameter, the second battery pack parameter, and the third battery pack parameter; if it is determined that the first battery pack parameter does not include the common number, at least two consecutive monomer batteries are used as the third monomer battery and / or at least one marginal monomer battery is used as the third monomer battery. The second screening threshold range further includes the range where the number of the monomer battery is any one of the numbers of two consecutive monomer batteries in the first battery pack parameter and / or the number of at least one marginal monomer battery.

[0079] In an embodiment of the present invention, the main control board 1 is specifically configured to, if it is determined that the first battery pack parameter does not include the numbers of any two consecutive monomer batteries and the numbers of any one marginal monomer battery, add the numbers of at least one second monomer battery to the third battery pack parameter according to the current and temperature of the obtained battery pack.

[0080] In an embodiment of the present invention, the main control board 1 is specifically configured to, if it is determined that the first battery pack parameter includes the common number, reduce the output power of the battery pack to the set power according to the lowest monomer voltage among the monomer voltages of at least one monomer battery; send a disconnection diagnosis instruction to the sub-board 2 so that the sub-board 2 determines whether the acquisition line corresponding to at least one second monomer battery other than the third monomer battery in at least one second monomer battery is disconnected according to the disconnection diagnosis instruction.

[0081] In an embodiment of the present invention, the main control board 1 is specifically configured to determine whether the current of the battery pack obtained is within the charging current range and whether the temperature of the battery pack obtained is within the first temperature threshold range; if it is determined that the current of the battery pack obtained is within the charging current range and the temperature of the battery pack obtained is within the first temperature threshold range, then obtain a first number of maximum charging longitudinal voltage differences from the longitudinal voltage differences corresponding to the second monomer batteries other than the third monomer battery among at least one second monomer battery; obtain the first numbers of the monomer batteries corresponding to the first number of maximum charging longitudinal voltage differences; and add the first numbers of the first numbers to the second battery pack parameters.

[0082] In an embodiment of the present invention, the main control board 1 is specifically configured to determine whether the current of the battery pack is within the discharge current range and whether the temperature of the battery pack obtained is within the second temperature threshold range; if it is determined that the current of the battery pack is within the discharge current range and the temperature of the battery pack is within the second temperature threshold range, then obtain a second number of maximum discharge longitudinal voltage differences from the longitudinal voltage differences corresponding to the second monomer batteries with a monomer voltage less than or equal to the third threshold among at least one second monomer battery; obtain the second numbers of the monomer batteries corresponding to the second number of maximum discharge longitudinal voltage differences; and add the second numbers of the second numbers to the third battery pack parameters.

[0083] In an embodiment of the present invention, the main control board 1 is specifically configured to determine whether the lowest monomer voltage among the monomer voltages of at least one second monomer battery other than the third monomer battery in the at least one second monomer battery obtained is less than the fault threshold; if it is determined that the lowest monomer voltage is less than the fault threshold, then reduce the output power of the battery pack to the set power.

[0084] In an embodiment of the present invention, the main control board 1 is specifically configured to determine whether the second state of the battery pack is the state of initial power-on; if it is determined that the second state of the battery pack is the state of initial power-on, then obtain the second battery pack parameters and the third battery pack parameters; if it is determined that the second state of the battery pack is not the state of initial power-on, then obtain a third number of minimum monomer voltages from the plurality of monomer voltages; obtain the third numbers of the monomer batteries corresponding to the third number of minimum monomer voltages; and add the third numbers of the third numbers to the first battery pack parameters.

[0085] In an embodiment of the present invention, the main control board 1 is further configured to reduce the output power of the battery pack to the set power.

[0086] An embodiment of the present invention provides a method for determining a broken acquisition line. This method is applied to the main control board of a battery pack. If the main control board selects at least one first single cell with a single cell voltage less than a first threshold from multiple single cells, it determines that the acquisition lines corresponding to at least one first single cell are broken; according to the obtained first state of the battery pack and the single cell parameters of multiple single cells, it selects at least one third single cell from at least one second single cell other than the first single cell among multiple single cells, and the single cell parameters of the third single cell are within the threshold range corresponding to the single cell parameters; it determines that the acquisition lines corresponding to at least one third single cell are broken, thereby improving the accuracy of determining a broken acquisition line.

[0087] Figure 2 is a flowchart of a method for determining a broken acquisition line provided by an embodiment of the present invention. As Figure 2 shown, this method includes:

[0088] Step 101, determine whether the single cell voltages of multiple single cells are all greater than or equal to a first threshold; if it is determined that the single cell voltage of any one single cell is less than the first threshold, then execute step 102; if it is determined that the single cell voltages of at least one single cell are greater than or equal to the first threshold, then execute step 104.

[0089] In an embodiment of the present invention, this method is applied to the main control board of a battery pack, and the battery pack further includes multiple single cells. As Figure 1 shown, the battery pack includes a sub-board and multiple single cells. The sub-board collects the single cell voltages of multiple single cells; the sub-board sends the single cell voltages of multiple single cells to the main control board. The main control board receives the single cell voltages of multiple single cells sent by the sub-board; determines whether the single cell voltages of each single cell are all greater than or equal to the first threshold; if it is determined that the single cell voltage of any one single cell is less than the first threshold, then execute step 102; if it is determined that the single cell voltage of any one single cell is greater than or equal to the first threshold, then continue to determine whether the single cell voltage of the next single cell is greater than or equal to the first threshold until it is determined whether the single cell voltages of all single cells are all greater than or equal to the first threshold, and then the main control board executes step 104.

[0090] Step 102, select at least one first single cell with a single cell voltage less than the first threshold from multiple single cells.

[0091] In an embodiment of the present invention, the main control board selects the single cells corresponding to the single cell voltages less than the first threshold from multiple single cells, and takes the single cells corresponding to the single cell voltages less than the first threshold as the first single cells.

[0092] Step 103, determine that the acquisition lines corresponding to at least one first single cell are broken.

[0093] In an embodiment of the present invention, one end of the acquisition line is connected to the single cell, and the other end is connected to the daughter board. Each single cell corresponds to an acquisition line.

[0094] Step 104: According to the first state of the battery pack and the single-cell parameters of multiple single cells, at least one third single cell is screened out from at least one second single cell other than the first single cell among the multiple single cells, and the single-cell parameters of the third single cell are within the threshold range corresponding to the single-cell parameters.

[0095] In an embodiment of the present invention, the first state of the battery pack includes a charging state or a discharging state. The single-cell parameters include a first single-cell parameter or a second single-cell parameter. The first single-cell parameter includes the longitudinal pressure difference between single cells. The second single-cell parameter includes the single-cell voltage.

[0096] Step 105: Determine that the acquisition line corresponding to at least one third single cell is broken.

[0097] In an embodiment of the present invention, the main control board determines whether the acquisition line connected to the single cell is broken from the direction of the first state of the battery pack, the voltage of the single cell, and the direction of the single-cell parameters.

[0098] An embodiment of the present invention provides a method for determining a broken acquisition line. The method is applied to the main control board of a battery pack. If at least one first single cell with a single-cell voltage less than a first threshold is screened out from multiple single cells, it is determined that the acquisition line corresponding to at least one first single cell is broken; according to the first state of the battery pack and the single-cell parameters of multiple single cells, at least one third single cell is screened out from at least one second single cell other than the first single cell among the multiple single cells, and the single-cell parameters of the third single cell are within the threshold range corresponding to the single-cell parameters; it is determined that the acquisition line corresponding to at least one third single cell is broken, thereby improving the accuracy of determining a broken acquisition line.

[0099] Figure 3 It is a flowchart of another method for determining a broken acquisition line provided by an embodiment of the present invention. As Figure 3 shown, the method includes:

[0100] Step 201: Determine whether the single-cell voltages of multiple single cells are all greater than or equal to a first threshold. If it is determined that the single-cell voltage of any one single cell is less than the first threshold, step 202 is executed; if it is determined that the single-cell voltages of at least one single cell are greater than or equal to the first threshold, step 204 is executed.

[0101] Step 202: Screen out at least one first single cell with a single-cell voltage less than the first threshold from multiple single cells.

[0102] In an embodiment of the present invention, if the main control board determines that the single - cell voltage of any one single - cell battery is less than the first threshold, then this single - cell battery is taken as the first single - cell battery.

[0103] Step 203: Determine that the acquisition line corresponding to at least one first single - cell battery is disconnected.

[0104] In an embodiment of the present invention, the single - cell battery is connected to one end of the acquisition line. If the main control board determines that any one single - cell battery is the first single - cell battery, then the acquisition line corresponding to this first single - cell battery is disconnected.

[0105] Step 204: Determine whether the first state of the battery pack is a charging state or a discharging state. If it is determined that the first state of the battery pack is a charging state, then execute Step 205; if it is determined that the first state of the battery pack is a discharging state, then execute Step 206.

[0106] Step 205: Select, from at least one second single - cell battery, the second single - cell batteries whose first single - cell parameters of at least one single - cell battery are within the first screening threshold range, and take the second single - cell batteries whose first single - cell parameters are within the first screening threshold range as the third single - cell batteries.

[0107] In an embodiment of the present invention, the main control board determines that at least one of the single - cell voltages of multiple single - cell batteries is greater than the first threshold; the single - cell batteries with single - cell voltages greater than the first threshold are taken as the second single - cell batteries. The first screening range includes the range where the first single - cell parameter is less than the second threshold, and the first single - cell parameter includes the single - cell longitudinal pressure difference. When the first single - cell parameter is the single - cell longitudinal pressure difference, the first screening range includes the range where the single - cell longitudinal pressure difference is less than the second threshold. Figure 4 It is a flowchart for determining the third single - cell battery provided by an embodiment of the present invention. As Figure 4 shown, Step 205 may specifically include:

[0108] Step 2051: Determine whether the single - cell longitudinal pressure difference of at least one second single - cell battery is greater than or equal to the second threshold. If it is determined that the single - cell longitudinal pressure difference of any one second single - cell battery is less than the second threshold, then execute Step 2052; if it is determined that the single - cell longitudinal pressure difference of at least one second single - cell battery is greater than or equal to the second threshold, then execute Step 2053.

[0109] In an embodiment of the present invention, the main control board acquires the current single - cell voltage and the previous single - cell voltage of the second single - cell battery; according to each current single - cell voltage and the previous single - cell voltage, generates the single - cell longitudinal pressure difference of the second single - cell battery. The single - cell longitudinal pressure difference is the difference between the current single - cell voltage and the previous single - cell voltage.

[0110] The main control board obtains the longitudinal voltage differences of at least one second single cell; determines whether the longitudinal voltage difference of each second single cell is greater than or equal to a second threshold; if it is determined that the longitudinal voltage difference of any second single cell is less than the second threshold, step 2052 is executed; if it is determined that the longitudinal voltage difference of any second single cell is greater than or equal to the second threshold, it continues to determine whether the longitudinal voltage difference of the next second single cell is greater than or equal to the second threshold until it is determined whether the longitudinal voltage differences of all second single cells are greater than or equal to the second threshold, and the main control board executes step 2053.

[0111] Step 2052: Use the second single cell with a longitudinal voltage difference less than the second threshold as the third single cell.

[0112] Step 2053: Add the numbers of at least one second single cell to the second battery pack parameters according to the obtained current and temperature of the battery pack.

[0113] In the embodiment of the present invention, before step 2053, it further includes: collecting the numbers of multiple single cells by sub-boards; sending the numbers of the multiple single cells to the main control board. The main control board establishes a correspondence between the single cells and the numbers according to the received numbers of the multiple single cells. Each single cell corresponds to a number, and the second battery pack parameters include the numbers of at least one single cell. Adding the numbers of at least one second single cell to the second battery pack parameters includes: the main control board updates the second battery pack parameters according to the numbers of at least one second single cell, so that the numbers of at least one second single cell overwrite the original parameters in the second battery pack parameters, so that the second battery pack parameters only include the numbers of at least one second single cell newly added by the main control board.

[0114] Figure 5 It is a flowchart for updating the second battery pack parameters provided by the embodiment of the present invention. Step 2053 may specifically include:

[0115] Step 2053a: Determine whether the obtained current of the battery pack is within the charging current range and whether the obtained temperature of the battery pack is within the first temperature threshold range. If it is determined that the obtained current of the battery pack is within the charging current range and the obtained temperature of the battery pack is within the first temperature threshold range, step 2053b is executed; if it is determined that the obtained current of the battery pack is not within the charging current range and / or the obtained temperature of the battery pack is not within the first temperature threshold range, the process ends.

[0116] In an embodiment of the present invention, the main control board collects the current of the battery pack. The sub-board collects the temperature of the battery pack and sends the temperature of the battery pack to the main control board. The main control board receives the temperature of the battery pack sent by the sub-board. The charging current range is [CurrChrg1, CurrChrg2], where CurrChrg1 is the first current threshold and CurrChrg2 is the second current threshold; the charging current range is a range greater than or equal to the first current threshold and less than or equal to the second current threshold. The first temperature threshold range is [Temp1, Temp2], where Temp1 is the first temperature threshold and Temp2 is the second temperature threshold; the first temperature threshold range is a range greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold.

[0117] If the main control board determines that the current of the battery pack is greater than or equal to the first current threshold and less than or equal to the second current threshold, and the temperature of the battery pack is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, then step 2053b is executed. If the main control board determines that any one or more of the current of the battery pack is less than the first current threshold, the current of the battery pack is greater than the second current threshold, the temperature of the battery pack is less than the first temperature threshold, and the temperature of the battery pack is greater than the second temperature threshold, the process ends.

[0118] For example, the main control board determines that the current of the battery pack is less than the first current threshold and the temperature of the battery pack is less than the first temperature threshold; or, determines that the current of the battery pack is less than the first current threshold and the temperature of the battery pack is within the first temperature threshold range; or, determines that the current of the battery pack is less than the first current threshold and the temperature of the battery pack is greater than the second temperature threshold; or, determines that the current of the battery pack is within the charging current range and the temperature of the battery pack is less than the first temperature threshold; or, determines that the current of the battery pack is within the charging current range and the temperature of the battery pack is greater than the second temperature threshold; or, determines that the current of the battery pack is greater than the second current threshold and the temperature of the battery pack is less than the first temperature threshold; or, determines that the current of the battery pack is greater than the second current threshold and the temperature of the battery pack is within the first temperature threshold range; or, determines that the current of the battery pack is greater than the second current threshold and the temperature of the battery pack is greater than the second temperature threshold, and the process ends.

[0119] Step 2053b: Obtain a first number of maximum charging longitudinal pressure differences from the longitudinal pressure differences of the second single cells corresponding to the second single cells other than the third single cell among at least one second single cell.

[0120] In an embodiment of the present invention, the second single cells other than the third single cell among the second single cells are second single cells with a longitudinal pressure difference greater than or equal to the second threshold. The main control board obtains a first number of maximum charging longitudinal pressure differences from the longitudinal pressure differences greater than or equal to the second threshold.

[0121] For example, the number of second single-cell batteries with a longitudinal pressure difference between monomers greater than or equal to a second threshold is a fifth number, and the fifth number is greater than or equal to 1. When the fifth number is equal to 1, the first number is 1; when the fifth number is greater than 1, the value range of the first number is greater than or equal to 1 and less than or equal to the fifth number. Obtaining the first number of maximum charging longitudinal pressure differences includes: the main control board arranging the longitudinal pressure differences of the fifth number of single cells in a first order; obtaining the largest first number of single-cell longitudinal pressure differences from the longitudinal pressure differences of the fifth number of single cells, and each of the first number of single-cell longitudinal pressure differences is the maximum charging longitudinal pressure difference. The first order includes the order from large to small or the order from small to large.

[0122] Step 2053c: Obtain the first numbers of the single-cell batteries corresponding to the first number of maximum charging longitudinal pressure differences.

[0123] In the embodiment of the present invention, the main control board obtains the number corresponding to the maximum charging longitudinal pressure difference according to the corresponding relationship between the maximum charging longitudinal pressure difference and the single-cell battery and the corresponding relationship between the single-cell battery and the number; and takes the number corresponding to the maximum charging longitudinal pressure difference as the first number.

[0124] Step 2053d: Add the first number of first numbers to the second battery pack parameters.

[0125] In the embodiment of the present invention, the main control board deletes the original parameters in the second battery pack parameters; and adds the first number of first numbers to the second battery pack parameters, so that the second battery pack parameters only include the first number of first numbers.

[0126] Step 206: Screen out at least one second single-cell battery from at least one second single-cell battery whose second single-cell parameters are within a second screening threshold range, and use the second single-cell battery whose second single-cell parameters are within the second screening threshold range as the third single-cell battery.

[0127] In the embodiment of the present invention, the second screening threshold range includes the range where the second single-cell parameter is greater than a third threshold, and the second single-cell parameter includes the single-cell voltage. If the second single-cell parameter further includes the number of the single-cell battery, the second screening threshold range further includes the range where the number of the single-cell battery is any one of the numbers of two consecutive single-cell batteries in the first battery pack parameters and / or the numbers of at least one edge single-cell battery.

[0128] Figure 6 Another flowchart for determining the third single-cell battery provided by the embodiment of the present invention is as Figure 6 shown, and step 206 may specifically include:

[0129] Step 2061: Determine whether the single-cell voltage of at least one second single-cell battery is less than or equal to a third threshold. If it is determined that the single-cell voltage of any one of the second single-cell batteries is greater than the third threshold, then execute Step 2062; if it is determined that the single-cell voltage of at least one second single-cell battery is less than or equal to the third threshold, then execute Step 2063.

[0130] In the embodiment of the present invention, the main control board determines whether the single-cell voltage of each second single-cell battery is less than or equal to a third threshold; if it is determined that the single-cell voltage of any one of the second single-cell batteries is greater than the third threshold, then execute Step 2062; if it is determined that the single-cell voltage of any one of the second single-cell batteries is less than or equal to the third threshold, then continue to determine whether the single-cell voltage of the next second single-cell battery is less than or equal to the third threshold until it is determined whether the single-cell voltages of all the second single-cell batteries are less than or equal to the third threshold, and then execute Step 2063.

[0131] When the main control board determines that there is an open-circuit fault in the acquisition line in the battery pack, the single-cell battery has a working voltage range. When the single-cell voltage of the single-cell battery is lower than or higher than the working voltage range, the main control board will determine that the acquisition line corresponding to the single-cell battery is broken, so that the main control board determines whether the acquisition line corresponding to the single-cell battery is broken according to the single-cell voltage of the single-cell battery and the value range of the voltage.

[0132] Step 2062: Use the second single-cell battery with a single-cell voltage greater than the third threshold as the third single-cell battery.

[0133] Step 2063: Determine whether the obtained first battery pack parameters include the numbers of at least two consecutive single-cell batteries or the numbers of at least one marginal single-cell battery. If so, then execute Step 2065; if not, then execute Step 2064.

[0134] In the embodiment of the present invention, for example, as Figure 1As shown, when n equals 3 and m equals 1, it means that a battery pack includes 3 single cells. The arrangement of the 3 single cells is in a horizontal row. The number of single cell A11 is A11, the number of single cell A12 is A12, and the number of single cell A13 is A13. The numbers of two consecutive single cells include: A11 and A12; or A12 and A13. The numbers of the edge single cells include A11 or A13. When the first battery pack parameter includes A12, the main control board determines that the first battery pack parameter obtained does not include the numbers of any two consecutive single cells nor the number of any one edge single cell. The main control board executes step 2064. When the first battery pack parameter includes A11 and / or A13, the main control board determines that the first battery pack parameter obtained does not include the numbers of any two consecutive single cells but includes the number of at least one edge single cell. The main control board executes step 2065. When the first battery pack parameter includes A11 and A12, or A12 and A13, or A11, A12 and A13, the main control board determines that the first battery pack parameter obtained includes the numbers of at least two consecutive single cells and the number of at least one edge single cell. The main control board executes step 2065.

[0135] Figure 7 The flowchart of obtaining battery pack parameters provided by an embodiment of the present invention is as Figure 7 shown. Specifically, before step 2063, it may include:

[0136] Step 2063a: Determine whether the second state of the battery pack is the state of initial power-on. If so, execute step 2063b; if not, execute step 2063c.

[0137] In an embodiment of the present invention, if the state of initial power-on is the state when the battery pack is first awakened during each operation.

[0138] Step 2063b: Obtain the second battery pack parameter and the third battery pack parameter.

[0139] In an embodiment of the present invention, the main control board further includes a storage medium. The main control board determines that the second state of the battery pack is the state of initial power-on; obtains the second battery pack parameter and the third battery pack parameter obtained by the main control board during the previous operation of the battery pack from the storage medium. Both the second battery pack parameter and the third battery pack parameter include the number of at least one single cell. At this time, the main control board defaults that the longitudinal pressure difference of the single cell corresponding to the single cell is 0.

[0140] Step 2063c: Obtain the third number of minimum single cell voltages from multiple single cell voltages.

[0141] In an embodiment of the present invention, the main control board obtains the individual voltages of multiple individual cells; arranges the individual voltages of the multiple individual cells in a second order; obtains the smallest third number of individual voltages from the multiple individual voltages, and each individual voltage in the third number of individual voltages is the smallest individual voltage. The second order includes the order from largest to smallest or the order from smallest to largest.

[0142] Step 2063c further includes: the main control board obtains the fourth number of the largest individual voltages from the multiple individual voltages.

[0143] Step 2063d: Obtain the third number of the third numbers corresponding to the individual cells with the smallest individual voltages.

[0144] In an embodiment of the present invention, the main control board obtains the number corresponding to the smallest individual voltage according to the corresponding relationship between the individual voltage and the individual cell and the corresponding relationship between the individual cell and the number; uses the number corresponding to the smallest individual voltage as the third number.

[0145] Step 2063d further includes: the main control board obtains the fourth number of the fourth numbers corresponding to the individual cells with the largest individual voltages.

[0146] Step 2063e: Add the third number of the third numbers to the first battery pack parameter.

[0147] In an embodiment of the present invention, step 2063e further includes: the main control board adds the fourth number of the fourth numbers to the fourth battery pack parameter.

[0148] In a possible implementation manner, if the second state of the battery pack is the state of initial power-on, then before step 2063e, neither the first battery pack parameter nor the fourth battery pack parameter includes any parameters. When the second state of the battery pack is the state of initial power-on, the main control board adds the third number of the third numbers to the first battery pack parameter, and the first battery pack parameter includes the third number of the third numbers; adds the fourth number of the fourth numbers to the fourth battery pack parameter, and the fourth battery pack parameter includes the fourth number of the fourth numbers.

[0149] In another possible implementation manner, if the second state of the battery pack is not the state of initial power-on, then before step 2063e, both the first battery pack parameter and the fourth battery pack parameter include at least one parameter of the individual voltage, and the parameter of the individual voltage includes the number of the individual voltage. The main control board deletes the original parameters in the first battery pack parameter; adds the third number of the third numbers to the first battery pack parameter so that the first battery pack parameter only includes the third number of the third numbers; deletes the original parameters in the fourth battery pack parameter; adds the fourth number of the fourth numbers to the fourth battery pack parameter so that the fourth battery pack parameter only includes the fourth number of the fourth numbers.

[0150] Step 2064: Add the numbers of at least one second single cell to the third battery pack parameter according to the obtained current and temperature of the battery pack.

[0151] In an embodiment of the present invention, before step 2064, it further includes: collecting the numbers of multiple single cells by a sub-board; sending the numbers of the multiple single cells to the main control board. The main control board establishes a correspondence between the single cells and the numbers according to the received numbers of the multiple single cells. The main control board determines that the first battery pack parameter does not include the numbers of any two consecutive single cells and the number of any one edge single cell.

[0152] Adding the numbers of at least one second single cell to the third battery pack parameter includes: the main control board updates the third battery pack parameter according to the numbers of at least one second single cell, so that the numbers of at least one second single cell cover the original parameters in the third battery pack parameter, so that the third battery pack parameter only includes the numbers of at least one second single cell newly added by the main control board.

[0153] Figure 8 The flowchart of updating the third battery pack parameter provided by an embodiment of the present invention is as Figure 8 shown, step 2064 may specifically include:

[0154] Step 2064a: Determine whether the current of the battery pack is within the discharge current range and whether the obtained temperature of the battery pack is within the second temperature threshold range. If it is determined that the current of the battery pack is within the discharge current range and the temperature of the battery pack is within the second temperature threshold range, then execute step 2064b; if it is determined that the current of the battery pack is not within the discharge current range and / or the temperature of the battery pack is not within the second temperature threshold range, then end the process.

[0155] In an embodiment of the present invention, the main control board collects the current of the battery pack. The sub-board collects the temperature of the battery pack; sends the temperature of the battery pack to the main control board. The main control board receives the temperature of the battery pack sent by the sub-board. The discharge current range is [CurrDisg1, CurrDisg2], where CurrDisg1 is the third current threshold and CurrDisg2 is the fourth current threshold; the charging current range is the range greater than or equal to the third current threshold and less than or equal to the fourth current threshold. The second temperature threshold range is [Temp3, Temp 4], where Temp3 is the third temperature threshold and Temp4 is the fourth temperature threshold; the second temperature threshold range is the range greater than or equal to the third temperature threshold and less than or equal to the fourth temperature threshold.

[0156] If the main control board determines that the current of the battery pack is greater than or equal to the third current threshold and less than or equal to the fourth current threshold, and the temperature of the battery pack is greater than or equal to the third temperature threshold and less than or equal to the fourth temperature threshold, then step 2064b is executed. If the main control board determines that any one or more of the current of the battery pack is less than the third current threshold, the current of the battery pack is greater than the fourth current threshold, the temperature of the battery pack is less than the third temperature threshold, and the temperature of the battery pack is greater than the fourth temperature threshold, the process ends.

[0157] Step 2064b: Obtain the second quantity of maximum discharge longitudinal pressure differences from the longitudinal pressure differences corresponding to the second single cells with at least one single cell voltage less than or equal to the third threshold.

[0158] In an embodiment of the present invention, the main control board obtains the longitudinal pressure differences corresponding to the second single cells other than the third single cell among at least one second single cell; obtains the second quantity of maximum longitudinal pressure differences from at least one longitudinal pressure difference, and each longitudinal pressure difference in the second quantity of maximum longitudinal pressure differences is a maximum discharge longitudinal pressure difference.

[0159] For example, the number of the second single cells with a single cell voltage less than or equal to the third threshold is the sixth quantity, and the sixth quantity is greater than or equal to 1. When the sixth quantity is equal to 1, the second quantity is 1; when the sixth quantity is greater than 1, the value range of the second quantity is greater than or equal to 1 and less than or equal to the sixth quantity. Obtaining the second quantity of maximum discharge longitudinal pressure differences includes: the main control board arranges the sixth quantity of longitudinal pressure differences in the third order; obtains the maximum second quantity of longitudinal pressure differences from the sixth quantity of longitudinal pressure differences, and each longitudinal pressure difference in the second quantity of longitudinal pressure differences is a maximum charge longitudinal pressure difference. The third order includes the order from large to small or the order from small to large.

[0160] Step 2064c: Obtain the second numbers of the single cells corresponding to the second quantity of maximum discharge longitudinal pressure differences.

[0161] In an embodiment of the present invention, the main control board obtains the numbers corresponding to the maximum discharge longitudinal pressure differences according to the corresponding relationship between the maximum discharge longitudinal pressure differences and the single cells and the corresponding relationship between the single cells and the numbers; uses the numbers corresponding to the maximum charge longitudinal pressure differences as the second numbers.

[0162] Step 2064d: Add the second quantity of second numbers to the third battery pack parameters.

[0163] In the embodiment of the present invention, before step 2064d, the third battery pack parameters include the parameters of at least one single battery. Adding the second quantity of second numbers to the third battery pack parameters includes: the main control board deleting the original parameters in the third battery pack parameters; adding the second quantity of second numbers to the third battery pack parameters so that the third battery pack parameters only include the second quantity of second numbers.

[0164] Step 2065: Determine whether there is at least one common number of single batteries in the first battery pack parameters, the obtained second battery pack parameters, and the third battery pack parameters. Both the second battery pack parameters and the third battery pack parameters include the numbers of at least one single battery. The common number is the same number in the first battery pack parameters, the second battery pack parameters, and the third battery pack parameters. If so, execute step 2067; if not, execute step 2066.

[0165] In the embodiment of the present invention, the main control board determines that the first battery pack parameters include the numbers of at least two consecutive single batteries and / or the numbers of at least one marginal single battery.

[0166] Step 2066: Use at least two consecutive single batteries as the third single battery and / or use at least one marginal single battery as the third single battery.

[0167] Step 2067: Reduce the output power of the battery pack to the set power according to the lowest single battery voltage among the at least one single battery voltages.

[0168] In the embodiment of the present invention, the set power can be a value set by the staff according to the safety threshold of the battery cell. Figure 9 It is a flowchart for reducing the output power of a battery pack provided by an embodiment of the present invention. As Figure 9 shown, step 2067 may specifically include:

[0169] Step 2067a: Determine whether the lowest single battery voltage among the at least one second single battery other than the third single battery in the obtained at least one second single battery is less than the fault threshold. If so, execute step 2067b; if not, end the process.

[0170] In the embodiment of the present invention, the main control board obtains the minimum value of the single battery voltages from the single battery voltages of the at least one second single battery other than the third single battery in the at least one second single battery; uses the minimum value of the single battery voltages as the lowest single battery voltage; determines whether the lowest single battery voltage is less than the fault threshold; if it is determined that the lowest single battery voltage is less than the fault threshold, execute step 2067b; if it is determined that the lowest single battery voltage is greater than or equal to the fault threshold, end the process.

[0171] Step 2067b: Reduce the output power of the battery pack to the set power.

[0172] In an embodiment of the present invention, the main control board determines that the lowest single-cell voltage is less than the fault threshold.

[0173] Step 2068: Send a disconnection diagnosis instruction to the daughter board so that the daughter board determines whether the acquisition line corresponding to at least one second single-cell battery other than the third single-cell battery in at least one second single-cell battery is disconnected according to the disconnection diagnosis instruction.

[0174] In an embodiment of the present invention, as Figure 1 shown, the battery pack further includes a daughter board, which has functions such as balancing function, single-cell voltage acquisition function, and sampling line disconnection diagnosis function. However, when the daughter board uses any one of the balancing function, single-cell voltage acquisition function, and sampling line disconnection diagnosis function, the daughter board cannot use any one of the remaining two functions. The main control board can determine whether the acquisition line corresponding to the single-cell battery is disconnected, thereby reducing the situation that the daughter board cannot collect the single-cell voltage of the single-cell battery in time due to diagnosing whether the acquisition line corresponding to the single-cell battery is disconnected, and enabling the daughter board to continuously collect the single-cell voltage of the single-cell battery.

[0175] The disconnection diagnosis instruction includes the numbers of at least one second single-cell battery other than the third single-cell battery in at least one second single-cell battery. The daughter board receives the disconnection diagnosis instruction sent by the main control board; determines whether the acquisition line corresponding to at least one second single-cell battery other than the third single-cell battery in at least one second single-cell battery is disconnected according to the disconnection diagnosis instruction; if it is determined that the acquisition line corresponding to at least one second single-cell battery is disconnected, then sends a diagnosis result signal to the main control board, and the diagnosis result signal includes the number of the second single-cell battery corresponding to the disconnected acquisition line. The main control board receives the disconnection determination signal sent by the daughter board.

[0176] If there is a filter capacitor or software filtering in the circuit of the battery pack, the single-cell voltage of the single-cell battery will not immediately drop to 0V, resulting in the main control board being unable to quickly determine whether the acquisition line is disconnected. This lagging judgment will lead to false alarms of undervoltage faults or differential voltage faults. The operation of the main control board sending the disconnection diagnosis instruction to the daughter board takes into account the situation of the presence of a filter capacitor or software filtering in the sampling single path of the battery pack, and also takes into account the problem of poor consistency caused by the aging of the battery cells, thereby reducing false alarms of undervoltage faults or differential voltage faults.

[0177] Step 207: Reduce the output power of the battery pack to the set power.

[0178] An embodiment of the present invention provides a method for determining a broken collecting line. The method is applied to the main control board of a battery pack. If at least one first single battery whose single battery voltage is less than a first threshold is selected from multiple single batteries, it is determined that the collecting line corresponding to at least one first single battery is broken; according to the obtained first state of the battery pack and the single battery parameters of multiple single batteries, at least one third single battery is selected from at least one second single battery other than the first single battery among multiple single batteries, and the single battery parameters of the third single battery are within the threshold range corresponding to the single battery parameters; it is determined that the collecting line corresponding to at least one third single battery is broken, thereby improving the accuracy of determining the broken collecting line.

[0179] Figure 10 FIG. is a schematic structural diagram of a device for determining a broken collecting line provided by an embodiment of the present invention, as Figure 10 shown, the device includes: a first determination module 11, a screening module 12 and a second determination module 13.

[0180] The first determination module 11 is connected to the screening module 12, and the screening module 12 is connected to the second determination module 13.

[0181] The first determination module 11 is configured to, if at least one first single battery whose single battery voltage is less than a first threshold is selected from multiple single batteries, determine that the collecting line corresponding to at least one first single battery is broken; the screening module 12 is configured to, according to the obtained first state of the battery pack and the single battery parameters of multiple single batteries, select at least one third single battery from at least one second single battery other than the first single battery among multiple single batteries, and the single battery parameters of the third single battery are within the threshold range corresponding to the single battery parameters; the second determination module 13 is configured to determine that the collecting line corresponding to at least one third single battery is broken.

[0182] In an embodiment of the present invention, the screening module 12 includes: a first screening sub-module 121 and a second screening sub-module 122. The first screening sub-module 121 is connected to the second screening sub-module 122.

[0183] The first screening sub-module 121 is configured to, if it is determined that the first state is a charging state, select at least one second single battery whose first single battery parameter is within the first screening threshold range from at least one second single battery, and use the second single battery whose first single battery parameter is within the first screening threshold range as the third single battery; the second screening sub-module 122 is configured to, if it is determined that the first state is a discharging state, select at least one second single battery whose second single battery parameter is within the second screening threshold range from at least one second single battery, and use the second single battery whose second single battery parameter is within the second screening threshold range as the third single battery.

[0184] In an embodiment of the present invention, the first screening threshold range includes a range where a first monomer parameter is less than a second threshold. The first monomer parameter includes a monomer longitudinal pressure difference. The first screening sub-module 121 is specifically configured to determine whether the monomer longitudinal pressure difference of at least one second monomer battery is greater than or equal to the second threshold; if it is determined that the monomer longitudinal pressure difference of any one second monomer battery is less than the second threshold, the second monomer battery with a monomer longitudinal pressure difference less than the second threshold is used as a third monomer battery; if it is determined that the monomer longitudinal pressure difference of at least one second monomer battery is greater than or equal to the second threshold, according to the obtained current and temperature of the battery pack, the numbers of at least one second monomer battery are added to the second battery pack parameter.

[0185] In an embodiment of the present invention, the second monomer parameter includes a monomer voltage. The second screening threshold range includes a range where the monomer voltage is less than a third threshold. The second screening sub-module 122 is specifically configured to determine whether the monomer voltage of at least one second monomer battery is less than or equal to the third threshold; if it is determined that the monomer voltage of any one second monomer battery is greater than the third threshold, the second monomer battery with a monomer voltage greater than the third threshold is used as a third monomer battery; if it is determined that the monomer voltage of at least one second monomer battery is less than or equal to the third threshold, it is determined whether the first battery pack parameter obtained includes the numbers of at least two consecutive monomer batteries or the numbers of at least one marginal monomer battery. The second monomer parameter further includes the numbers of monomer batteries; if it is determined that the first battery pack parameter includes the numbers of at least two consecutive monomer batteries and / or the numbers of at least one marginal monomer battery, it is determined whether there is a common number of at least one monomer battery among the first battery pack parameter, the obtained second battery pack parameter, and the third battery pack parameter. Both the second battery pack parameter and the third battery pack parameter include the numbers of at least one monomer battery. The common number is the same number among the first battery pack parameter, the second battery pack parameter, and the third battery pack parameter; if it is determined that the first battery pack parameter does not include a common number, at least two consecutive monomer batteries are used as third monomer batteries and / or at least one marginal monomer battery is used as a third monomer battery. The second screening threshold range further includes a range where the number of the monomer battery is any one of the numbers of two consecutive monomer batteries in the first battery pack parameter and / or the number of at least one marginal monomer battery.

[0186] In an embodiment of the present invention, the second screening sub-module 122 is specifically configured to, if it is determined that the first battery pack parameter does not include the numbers of any two consecutive monomer batteries and the numbers of any one marginal monomer battery, according to the obtained current and temperature of the battery pack, add the numbers of at least one second monomer battery to the third battery pack parameter.

[0187] In an embodiment of the present invention, the second screening sub-module 122 is specifically configured to, if it is determined that the first battery pack parameter includes a common number, reduce the output power of the battery pack to a set power according to the lowest single-cell voltage among the single-cell voltages of at least one single cell; send a disconnection diagnosis instruction to the daughter board, so that the daughter board determines whether the acquisition lines corresponding to at least one second single cell other than the third single cell among the at least one second single cell are disconnected according to the disconnection diagnosis instruction.

[0188] In an embodiment of the present invention, the first screening sub-module 121 is specifically configured to determine whether the current of the obtained battery pack is within the charging current range and whether the temperature of the obtained battery pack is within the first temperature threshold range; if it is determined that the current of the obtained battery pack is within the charging current range and the temperature of the obtained battery pack is within the first temperature threshold range, obtain the first quantity of the largest charging longitudinal voltage differences from the longitudinal voltage differences of the second single cells other than the third single cell among the at least one second single cell; obtain the first numbers of the single cells corresponding to the first quantity of the largest charging longitudinal voltage differences; add the first quantity of the first numbers to the second battery pack parameter.

[0189] In an embodiment of the present invention, the second screening sub-module 122 is specifically configured to determine whether the current of the battery pack is within the discharging current range and whether the temperature of the obtained battery pack is within the second temperature threshold range; if it is determined that the current of the battery pack is within the discharging current range and the temperature of the battery pack is within the second temperature threshold range, obtain the second quantity of the largest discharging longitudinal voltage differences from the longitudinal voltage differences of the second single cells whose single-cell voltage is less than or equal to the third threshold; obtain the second numbers of the single cells corresponding to the second quantity of the largest discharging longitudinal voltage differences; add the second quantity of the second numbers to the third battery pack parameter.

[0190] In an embodiment of the present invention, the second screening sub-module 122 is specifically configured to determine whether the lowest single-cell voltage among the single-cell voltages of at least one second single cell other than the third single cell in the obtained at least one second single cell is less than the fault threshold; if it is determined that the lowest single-cell voltage is less than the fault threshold, reduce the output power of the battery pack to the set power.

[0191] In an embodiment of the present invention, the second screening sub-module 122 is specifically configured to determine whether the second state of the battery pack is the state of initial power-on; if it is determined that the second state of the battery pack is the state of initial power-on, obtain the second battery pack parameter and the third battery pack parameter; if it is determined that the second state of the battery pack is not the state of initial power-on, obtain the third quantity of the smallest single-cell voltages from the multiple single-cell voltages; obtain the third numbers of the single cells corresponding to the third quantity of the smallest single-cell voltages; add the third quantity of the third numbers to the first battery pack parameter.

[0192] In an embodiment of the present invention, the device further includes: a reduction module 14. The reduction module 14 is connected to the screening module 12 and the second determination module 13.

[0193] The reduction module 14 is used to reduce the output power of the battery pack to a set power.

[0194] An embodiment of the present invention provides a determination device for a broken acquisition line. The device is applied to the main control board of a battery pack. If at least one first single battery with a single battery voltage less than a first threshold is screened out from multiple single batteries, it is determined that the acquisition line corresponding to at least one first single battery is broken; according to the obtained first state of the battery pack and the single parameters of multiple single batteries, at least one third single battery is screened out from at least one second single battery other than the first single battery among the multiple single batteries, and the single parameters of the third single battery are within the threshold range corresponding to the single parameters; it is determined that the acquisition line corresponding to at least one third single battery is broken, thereby improving the accuracy of determining a broken acquisition line.

[0195] An embodiment of the present invention provides a storage medium. The storage medium includes a stored program. When the program runs, it controls the device where the storage medium is located to execute the steps of the embodiment of the above-mentioned method for determining a broken acquisition line. For specific descriptions, reference can be made to the embodiment of the method for determining a broken acquisition line.

[0196] An embodiment of the present invention provides a main control board, including a memory and a processor. The memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the embodiment of the above-mentioned method for determining a broken acquisition line are implemented. For specific descriptions, reference can be made to the embodiment of the method for determining a broken acquisition line.

[0197] Figure 11 It is a schematic diagram of a main control board provided by an embodiment of the present invention. As Figure 11 shown, the main control board 30 of this embodiment includes: a processor 31, a memory 32, and a computer program 33 stored in the memory 32 and executable on the processor 31. When the computer program 33 is executed by the processor 31, it implements the method for determining a broken acquisition line in the embodiment. To avoid repetition, details are not described here one by one. Alternatively, when the computer program is executed by the processor 31, it implements the functions of each model / unit in the determination device for a broken acquisition line in the embodiment. To avoid repetition, details are not described here one by one.

[0198] The main control board 30 includes, but is not limited to, a processor 31 and a memory 32. Those skilled in the art can understand, Figure 11This is only an example of the main control board 30, which does not constitute a limitation on the main control board 30. It may include more or fewer components than those shown in the figure, or combine some components, or different components. For example, the main control board 30 may also include input / output devices, network access devices, buses, etc.

[0199] The so-called processor 31 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc.

[0200] The memory 32 may be an internal storage unit of the main control board 30, such as the hard disk or memory of the main control board 30. The memory 32 may also be an external storage device of the main control board 30, such as a plug-in hard disk equipped on the main control board 30, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 32 may also include both the internal storage unit and the external storage device of the main control board 30. The memory 32 is used to store computer programs and other programs and data required by the main control board 30. The memory 32 may also be used to temporarily store data that has been output or is to be output.

[0201] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0202] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other may be through some interfaces, and the indirect couplings or communication connections of the devices or units may be in electrical, mechanical, or other forms.

[0203] The unit described as a separation component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0204] In addition, each functional unit in various embodiments of the present invention may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a hardware plus software functional unit.

[0205] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc that can store program codes.

[0206] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for determining a broken wire of a collection line, characterized in that, The method is applied to the main control board of a battery pack, and the battery pack further includes a plurality of single cells. The method includes: If at least one first single cell with a single cell voltage less than a first threshold is screened out from the plurality of single cells, it is determined that the acquisition lines corresponding to at least one of the first single cells are disconnected; According to the first state of the battery pack and the single cell parameters of the plurality of single cells obtained, at least one third single cell is screened out from at least one second single cell other than the first single cells among the plurality of single cells, and the single cell parameters of the third single cell are within the corresponding threshold range of the single cell parameters; It is determined that the acquisition lines corresponding to at least one of the third single cells are disconnected; The single cell parameters include first single cell parameters or second single cell parameters. Screening out at least one third single cell from at least one second single cell other than the first single cells among the plurality of single cells includes: If it is determined that the first state is a charging state, at least one second single cell with the first single cell parameter of at least one single cell within a first screening threshold range is screened out from the at least one second single cell, and the second single cell with the first single cell parameter within the first screening threshold range is used as the third single cell. The first single cell parameter includes the longitudinal pressure difference between single cells; If it is determined that the first state is a discharging state, at least one second single cell with the second single cell parameter of at least one single cell within a second screening threshold range is screened out from the at least one second single cell, and the second single cell with the second single cell parameter within the second screening threshold range is used as the third single cell. The second single cell parameter includes the single cell voltage.

2. The method according to claim 1, wherein The first screening threshold range includes a range where the first single cell parameter is less than a second threshold. The first single cell parameter includes the longitudinal pressure difference between single cells. Screening out at least one second single cell with the first single cell parameter of at least one single cell within the first screening threshold range from the at least one second single cell, and using the second single cell with the first single cell parameter within the first screening threshold range as the third single cell includes: Judging whether the longitudinal pressure difference between single cells of the at least one second single cell is greater than or equal to the second threshold; If it is judged that the longitudinal pressure difference between single cells of any one of the second single cells is less than the second threshold, the second single cell with the longitudinal pressure difference between single cells less than the second threshold is used as the third single cell; If it is judged that the longitudinal pressure difference between single cells of the at least one second single cell is greater than or equal to the second threshold, the numbers of at least one second single cell are added to the second battery pack parameters according to the current and temperature of the battery pack obtained.

3. The method according to claim 2, wherein The second monomer parameter includes the monomer voltage, the second screening threshold range includes the range where the monomer voltage is greater than the third threshold, screening at least one monomer cell from the at least one second monomer cell where the second monomer parameter is within the second screening threshold range, and using the second monomer cell where the second monomer parameter is within the second screening threshold range as the third monomer cell, includes: Determine whether the monomer voltage of the at least one second monomer cell is less than or equal to the third threshold; If it is determined that the monomer voltage of any one of the second monomer cells is greater than the third threshold, then use the second monomer cell with the monomer voltage greater than the third threshold as the third monomer cell; If it is determined that the monomer voltage of the at least one second monomer cell is less than or equal to the third threshold, then determine whether the first battery pack parameter obtained includes the numbers of at least two consecutive monomer cells or the numbers of at least one marginal monomer cell. The second monomer parameter further includes the numbers of the monomer cells, and the first battery pack parameter is used to store the third numbers of the monomer cells corresponding to the third smallest monomer voltages; If it is determined that the first battery pack parameter does not include the numbers of any two consecutive monomer cells and the numbers of any one marginal monomer cell, then add the numbers of at least one second monomer cell to the third battery pack parameter according to the current and temperature of the obtained battery pack; If it is determined that the first battery pack parameter includes the numbers of at least two consecutive monomer cells and / or the numbers of at least one marginal monomer cell, then determine whether the first battery pack parameter, the obtained second battery pack parameter, and the third battery pack parameter include the common number of at least one monomer cell. Both the second battery pack parameter and the third battery pack parameter include the numbers of at least one monomer cell, and the common number is the same number among the first battery pack parameter, the second battery pack parameter, and the third battery pack parameter; If it is determined that the first battery pack parameter does not include the common number, then use both the at least two consecutive monomer cells as the third monomer cell and / or at least one marginal monomer cell as the third monomer cell. The second screening threshold range further includes the range where the number of the monomer cell is the number of any one of the two consecutive monomer cells in the first battery pack parameter and / or the number of at least one marginal monomer cell; 4. The method according to claim 3, wherein The method further includes: If it is determined that the first battery pack parameter includes the common number, then reduce the output power of the battery pack to the set power according to the lowest monomer voltage among the monomer voltages of the at least one monomer cell; Send a disconnection diagnosis instruction to the daughter board, so that the daughter board determines whether the acquisition line corresponding to at least one second monomer cell other than the third monomer cell in the at least one second monomer cell is disconnected according to the disconnection diagnosis instruction.

5. The method according to claim 2, characterized in that, Adding the numbers of at least one second single battery to the second battery group parameters according to the obtained current and temperature of the battery pack includes: Determining whether the obtained current of the battery pack is within the charging current range and whether the obtained temperature of the battery pack is within the first temperature threshold range; If it is determined that the obtained current of the battery pack is within the charging current range and the obtained temperature of the battery pack is within the first temperature threshold range, obtaining a first number of maximum charging longitudinal voltage differences from the longitudinal voltage differences of the second single batteries other than the third single battery among at least one of the second single batteries; Obtaining the first numbers of the single batteries corresponding to the first number of maximum charging longitudinal voltage differences; Adding the first numbers of the first numbers to the second battery group parameters.

6. The method according to claim 3, wherein Adding the numbers of at least one second single battery to the third battery group parameters according to the obtained current and temperature of the battery pack includes: Determining whether the current of the battery pack is within the discharge current range and whether the obtained temperature of the battery pack is within the second temperature threshold range; If it is determined that the current of the battery pack is within the discharge current range and the temperature of the battery pack is within the second temperature threshold range, obtaining a second number of maximum discharge longitudinal voltage differences from the longitudinal voltage differences of the second single batteries corresponding to at least one of the second single batteries whose single battery voltage is less than or equal to the third threshold; Obtaining the second numbers of the single batteries corresponding to the second number of maximum discharge longitudinal voltage differences; Adding the second numbers of the second numbers to the third battery group parameters.

7. The method according to claim 4, characterized in that Reducing the output power of the battery pack to a set power according to the lowest single battery voltage among the single battery voltages of at least one single battery includes: Determining whether the lowest single battery voltage among the single battery voltages of at least one second single battery other than the third single battery in the obtained at least one second single battery is less than a fault threshold; If it is determined that the lowest single battery voltage is less than the fault threshold, reducing the output power of the battery pack to the set power.

8. The method according to claim 3, wherein Before determining whether the obtained first battery group parameters include the numbers of at least two consecutive single batteries or the numbers of at least one marginal single battery, it further includes: Determining whether the second state of the battery pack is the state of initial power-on; If it is determined that the second state of the battery pack is the state of initial power-on, obtaining the second battery group parameters and the third battery group parameters; If it is determined that the second state of the battery pack is not the state of initial power-on, obtaining a third number of minimum single battery voltages from the multiple single battery voltages; Obtaining the third numbers of the single batteries corresponding to the third number of minimum single battery voltages; Adding the third numbers of the third numbers to the first battery group parameters.

9. The method according to claim 1, wherein After determining that the acquisition line corresponding to the single battery is disconnected, it further includes: Reducing the output power of the battery pack to the set power.

10. A battery pack, characterized in that, The battery pack includes a main control board and multiple single batteries; The main control board is configured to determine that the acquisition line corresponding to at least one first single cell is broken if at least one first single cell with a single cell voltage less than a first threshold is selected from the multiple single cells; according to the obtained first state of the battery pack and the single cell parameters of the multiple single cells, select at least one third single cell from at least one second single cell other than the first single cell among the multiple single cells, where the single cell parameters of the third single cell are within the threshold range corresponding to the single cell parameters; and determine that the acquisition line corresponding to the at least one third single cell is broken. The main control board is further configured to, if it is determined that the first state is the charging state, select at least one second single cell from the at least one second single cell whose first single cell parameter is within a first screening threshold range, and use the second single cell whose first single cell parameter is within the first screening threshold range as the third single cell, where the first single cell parameter includes the longitudinal pressure difference between single cells. If it is determined that the first state is the discharging state, select at least one second single cell from the at least one second single cell whose second single cell parameter is within a second screening threshold range, and use the second single cell whose second single cell parameter is within the second screening threshold range as the third single cell, where the second single cell parameter includes the single cell voltage.

11. A determining device for disconnection of a collection wire, characterized in that, It includes: A first determination module, configured to determine that the acquisition line corresponding to at least one first single cell is broken if at least one first single cell with a single cell voltage less than a first threshold is selected from the multiple single cells. A screening module, configured to, according to the obtained first state of the battery pack and the single cell parameters of the multiple single cells, select at least one third single cell from at least one second single cell other than the first single cell among the multiple single cells, where the single cell parameters of the third single cell are within the threshold range corresponding to the single cell parameters. A second determination module, configured to determine that the acquisition line corresponding to the at least one third single cell is broken. The screening module is specifically configured to, if it is determined that the first state is the charging state, select at least one second single cell from the at least one second single cell whose first single cell parameter is within a first screening threshold range, and use the second single cell whose first single cell parameter is within the first screening threshold range as the third single cell, where the first single cell parameter includes the longitudinal pressure difference between single cells. If it is determined that the first state is the discharging state, select at least one second single cell from the at least one second single cell whose second single cell parameter is within a second screening threshold range, and use the second single cell whose second single cell parameter is within the second screening threshold range as the third single cell, where the second single cell parameter includes the single cell voltage.

12. A storage medium, characterized in that, The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the method for determining disconnection of the acquisition line according to any one of claims 1 to 9.

13. A main control board, comprising a memory and a processor, the memory being used for storing information including program instructions, and the processor being used for controlling the execution of the program instructions, characterized in that, When the program instructions are loaded and executed by a processor, the method for determining disconnection of the acquisition line according to any one of claims 1 to 9 is implemented.

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