Tear tearing detection method and device for pole group in ternary cell and electronic equipment

Abstract

The invention discloses a tab tearing detection method and device for a pole group in a ternary cell and electronic equipment. The method comprises: determining that a battery pack is in a charging state; a plurality of first voltages, a plurality of second voltages, a third voltage and a fourth voltage are obtained in real time, the plurality of first voltages and the plurality of second voltages are voltages of the plurality of ternary cells in the battery pack at the first moment and the second moment respectively, and the third voltage and the fourth voltage are average voltages of the plurality of ternary cells at the first moment and the second moment respectively; determining respective cell charging rates of the plurality of ternary cells according to the plurality of first voltages and the plurality of second voltages; determining the average charging rate of the battery cell according to the third voltage and the fourth voltage; and determining whether the tabs of the pole groups in the plurality of ternary cells are torn or not according to the respective cell charging rates of the plurality of ternary cells, the average cell charging rate and a preset range. According to the method, the blank that the abnormal ternary battery cell (namely the ternary battery cell with the torn tab) cannot be identified by the whole vehicle end is filled up.

Description

Technical Field

[0001] The present invention belongs to the technical field of ternary battery cells, and particularly relates to a method, device and electronic device for detecting the tearing of tab ears of a pole group in a ternary battery cell. Background Art

[0002] Due to its high energy density characteristics, ternary battery cells are often widely used in high-end long-range vehicles of various automobile manufacturers. However, due to the instability characteristics of ternary battery cells, their market share in the application of the whole vehicle is reduced, so it is very important to monitor ternary battery cells.

[0003] Currently, for ternary battery cells with torn tab ears, only computer tomography scans and internal resistance detection are used to identify them at the production line end before packaging. For abnormal ternary battery cells (i.e., ternary battery cells with torn tab ears) that are released to the whole vehicle market, the whole vehicle end lacks detection means. Summary of the Invention

[0004] In order to solve the above problems, an embodiment of the present invention proposes a method, device and electronic device for detecting the tearing of tab ears of a pole group in a ternary battery cell.

[0005] In a first aspect, an embodiment of the present invention proposes a method for detecting the tearing of tab ears of a pole group in a ternary battery cell, which is applied to a Battery Management System (BMS) and includes:

[0006] Determine that the battery pack is in a charging state;

[0007] Obtain multiple first voltages, multiple second voltages, a third voltage, and a fourth voltage in real time. The multiple first voltages are the voltages of multiple ternary battery cells in the battery pack at a first moment respectively, the multiple second voltages are the voltages of multiple ternary battery cells in the battery pack at a second moment respectively, the third voltage is the average voltage of multiple ternary battery cells in the battery pack at the first moment, the fourth voltage is the average voltage of multiple ternary battery cells in the battery pack at the second moment, and the first moment is the next moment of the second moment;

[0008] Determine the charging rate of each ternary battery cell in the battery pack according to the multiple first voltages and the multiple second voltages;

[0009] Determine the average charging rate of multiple ternary battery cells in the battery pack according to the third voltage and the fourth voltage;

[0010] Determine whether the tab ears of the pole group in multiple ternary battery cells in the battery pack are torn according to the charging rate of each ternary battery cell in the battery pack, the average charging rate of the battery cells, and a preset range.

[0011] In a possible implementation, determining the charging rate of each of the multiple ternary battery cells in the battery pack according to the multiple first voltages and the multiple second voltages includes:

[0012] The charging rate of the target ternary battery cell = (the first voltage corresponding to the target ternary battery cell - the second voltage corresponding to the target ternary battery cell) / (the first moment - the second moment), where the target ternary battery cell is any one of the multiple ternary battery cells in the battery pack.

[0013] In a possible implementation, determining the average charging rate of the multiple ternary battery cells in the battery pack according to the third voltage and the fourth voltage includes:

[0014] The average charging rate of the battery cell = (the third voltage - the fourth voltage) / (the first moment - the second moment).

[0015] In a possible implementation, determining whether the tabs of the pole groups in the multiple ternary battery cells in the battery pack are torn according to the charging rate of each of the multiple ternary battery cells in the battery pack, the average charging rate of the battery cells, and a preset range includes:

[0016] Determine multiple target ratios, where the multiple target ratios are the ratios of the charging rates of the multiple ternary battery cells in the battery pack to the average charging rate of the battery cells respectively;

[0017] If at least one of the multiple target ratios is within the preset range, determine that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

[0018] In a possible implementation, the number of pole groups of each of the multiple ternary battery cells in the battery pack is m, where m is an integer greater than 1;

[0019] The preset range is m / (m - 1) ± a preset threshold;

[0020] The step of if at least one of the multiple target ratios is within the preset range, determining that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn includes:

[0021] If at least one of the multiple target ratios is within the preset range, determine that the tabs of the single pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

[0022] In a possible implementation, if at least one of the multiple target ratios is within the preset range, determining that the tabs of the single-pole group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn includes:

[0023] If the duration for which at least one of the multiple target ratios is within the preset range is greater than a preset time threshold, determine that the tabs of the single-pole group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn.

[0024] In a possible implementation, before determining that the battery pack is in a charging state, the method further includes:

[0025] After power-on self-check without faults, determine that the vehicle enters the high-voltage state.

[0026] After determining that the tabs of the single-pole group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn if the duration for which at least one of the multiple target ratios is within the preset range is greater than a preset time threshold, the method further includes:

[0027] In response to determining that the tabs of the single-pole group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn, issue a low-voltage request instruction for requesting the vehicle to enter the low-voltage state.

[0028] In a possible implementation, the preset threshold ∈ [0.2, 0.5].

[0029] In a second aspect, an embodiment of the present invention provides a device for detecting tab tearing of a pole group in a ternary battery cell, including:

[0030] A first determination module for determining that the battery pack is in a charging state;

[0031] An acquisition module for real-time acquisition of a plurality of first voltages, a plurality of second voltages, a third voltage, and a fourth voltage, where the plurality of first voltages are the voltages of a plurality of ternary battery cells in the battery pack at a first moment respectively, the plurality of second voltages are the voltages of the plurality of ternary battery cells in the battery pack at a second moment respectively, the third voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the first moment, the fourth voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the second moment, and the first moment is the next moment of the second moment;

[0032] A second determination module for determining the charging rate of each of the plurality of ternary battery cells in the battery pack according to the plurality of first voltages and the plurality of second voltages;

[0033] A third determination module, configured to determine an average charging rate of multiple ternary battery cells in the battery pack according to the third voltage and the fourth voltage;

[0034] A fourth determination module, configured to determine whether a tab of a pole group in multiple ternary battery cells in the battery pack is torn according to the charging rate of each ternary battery cell in the battery pack, the average charging rate of the battery cells, and a preset range.

[0035] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0036] A memory and a processor, where the processor and the memory communicate with each other through a bus; the memory stores program instructions executable by the processor, and the processor can execute the method described in the first aspect and each step in various possible implementations by invoking the program instructions.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the method described in the first aspect and each step in various possible implementations.

[0038] In a fifth aspect, an embodiment of the present invention provides a computer program product including instructions, and when the computer program product runs on a computer, it causes the computer to execute the method described in the first aspect and each step in various possible implementations.

[0039] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows: Based on the BMS at the vehicle end, it is determined whether at least one target ratio (that is, the ratio of the charging rate of each ternary battery cell in the battery pack to the average charging rate of the battery cells) is within a preset range, so as to determine whether the tab of the pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn. In particular, when the preset range is m / (m - 1) ± a preset threshold, it can be determined that the tab of a single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn, filling the gap that the vehicle end cannot identify such abnormal ternary battery cells (that is, ternary battery cells with torn tabs), and improving the monitoring ability of ternary battery cells at the vehicle end; by determining that the duration for which at least one target ratio among multiple target ratios is within the preset range is greater than a preset time threshold, false alarms of voltage caused by voltage sampling jumps of ternary battery cells are avoided, thereby wrongly detecting torn tabs, and the accuracy of torn tab detection is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic flowchart of a method for detecting a torn tab of a pole group in a ternary battery cell provided by an embodiment of the present invention;

[0041] Figure 2 It is a schematic flow chart for determining that the battery pack is in a charging state provided by an embodiment of the present invention;

[0042] Figure 3 It is another schematic flow chart of a method for detecting the tearing of the tab of the electrode group in a ternary battery cell provided by an embodiment of the present invention;

[0043] Figure 4 It is a schematic block diagram of a device for detecting the tearing of the tab of the electrode group in a ternary battery cell provided by an embodiment of the present invention;

[0044] Figure 5 It is a schematic block diagram of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] 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 "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.

[0047] It should be understood that the term " / and / " used herein is only a description of the association relationship of 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. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0048] 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 monitoring (stated condition or event)" may be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0049] At present, for the battery cells with torn tabs, only computer tomography inspection and internal resistance detection are carried out at the production line end before packaging to identify them. For the abnormal battery cells (i.e., the battery cells with torn tabs) released to the vehicle market, there is a lack of detection means at the vehicle end. In addition, the performance of the battery cells with torn tabs is generally a decrease in capacity. However, the BMS at the vehicle end monitors the vehicle capacity by comparing the capacity retention rate with the number of vehicle charge and discharge cycles, and there is no method for detecting the capacity of individual battery cells. That is to say, the BMS at the vehicle end cannot detect whether the tabs of the battery cells are torn.

[0050] In view of this, an embodiment of the present invention provides a method, device and electronic device for detecting the torn tabs of the electrode group in a ternary battery cell. Figure 1 The flowchart of a method for detecting the torn tabs of the electrode group in a ternary battery cell is shown. This method is applied to the BMS. As Figure 1 shown, this method includes the following steps:

[0051] Step 101, determine that the battery pack is in a charging state.

[0052] Step 102, obtain multiple first voltages, multiple second voltages, a third voltage, and a fourth voltage in real time. The multiple first voltages are the voltages of multiple ternary battery cells in the battery pack at a first moment respectively. The multiple second voltages are the voltages of multiple ternary battery cells in the battery pack at a second moment respectively. The third voltage is the average voltage of multiple ternary battery cells in the battery pack at the first moment. The fourth voltage is the average voltage of multiple ternary battery cells in the battery pack at the second moment. The first moment is the next moment of the second moment.

[0053] Step 103, determine the charging rate of each ternary battery cell in the battery pack according to the multiple first voltages and the multiple second voltages.

[0054] Step 104, determine the average charging rate of the ternary battery cells in the battery pack according to the third voltage and the fourth voltage.

[0055] Step 105, determine whether the tabs of the electrode group in the multiple ternary battery cells in the battery pack are torn according to the charging rate of each ternary battery cell in the battery pack, the average charging rate of the battery cells, and a preset range.

[0056] First, in combination with the embodiment of the present invention, the above step 101, that is, "determine that the battery pack is in a charging state", will be described in detail.

[0057] In the embodiment of the present invention, as one possible implementation manner, determining that the battery pack is in a charging state is achieved through each step in the flowchart shown as Figure 2 shown:

[0058] Step 201, after the BMS powers on and self-checks without faults, determine that the vehicle enters the high-voltage state.

[0059] In an embodiment of the present invention, after the BMS performs a power-on self-check without faults, it sends a high-voltage request instruction to the Vehicle Control Unit (VCU). This high-voltage request instruction is used to request the entire vehicle to enter the high-voltage state from the VCU. After receiving the high-voltage request instruction from the BMS, the VCU sends a high-voltage feedback instruction to the BMS. This high-voltage feedback instruction is used to indicate that the entire vehicle can enter the high-voltage state. After receiving the high-voltage feedback instruction from the VCU, the BMS determines that the entire vehicle has entered the high-voltage state.

[0060] Step 202: The BMS determines whether the battery pack is in a charging state.

[0061] In an embodiment of the present invention, the battery pack is composed of multiple ternary battery cells connected in series. Exemplarily, a 500V platform battery pack is generally composed of about 120 ternary battery cells connected in series. Inside a single ternary battery cell, multiple pole groups are connected in parallel. Exemplarily, inside a single ternary battery cell, 2 to 4 pole groups are connected in parallel. A single pole group includes a positive electrode tab and a negative electrode tab.

[0062] In an embodiment of the present invention, after step 201, the BMS determines whether the battery pack is in a charging state. If it is not in a charging state, step 202 is repeated.

[0063] Step 203: If it is in a charging state, step 102 is performed.

[0064] It can be understood that when charging the battery pack, the current direction is into the battery pack, that is, the current is a positive current. The BMS monitors the current direction and magnitude through a shunt or a Hall sensor. Exemplarily, when a continuous positive current is detected and the value is greater than a preset threshold, it is determined to be in a charging state. In other embodiments, it can also be through: when a charging signal is received, it is determined to be in a charging state, and the charging signal is generated after the electric vehicle establishes a communication link with the charging pile. In an embodiment of the present invention, if the BMS determines that the battery pack is in a charging state, step 102 is performed; if the BMS determines that the battery pack is not in a charging state, it returns to step 202 to re-determine whether the battery pack is in a charging state.

[0065] The following describes in detail the above step 102 in combination with an embodiment of the present invention, that is, "obtain multiple first voltages, multiple second voltages, and third and fourth voltages in real time. The multiple first voltages are the voltages of multiple ternary battery cells in the battery pack at a first moment respectively. The multiple second voltages are the voltages of multiple ternary battery cells in the battery pack at a second moment respectively. The third voltage is the average voltage of multiple ternary battery cells in the battery pack at the first moment. The fourth voltage is the average voltage of multiple ternary battery cells in the battery pack at the second moment. The first moment is the next moment of the second moment."

[0066] In an embodiment of the present invention, the BMS can obtain multiple first voltages, multiple second voltages, as well as a third voltage and a fourth voltage in real time. The multiple first voltages are the voltages of multiple ternary battery cells in the battery pack at a first moment respectively. The multiple second voltages are the voltages of multiple ternary battery cells in the battery pack at a second moment respectively. The third voltage is the average voltage of multiple ternary battery cells in the battery pack at the first moment. The fourth voltage is the average voltage of multiple ternary battery cells in the battery pack at the second moment. The first moment is the next moment of the second moment.

[0067] It should be noted that, as one possible implementation manner, in the embodiment of the present invention, a voltage sensor can be used to measure multiple first voltages and multiple second voltages in real time. Since the voltage sensor can measure multiple first voltages and multiple second voltages in real time, the BMS can obtain multiple first voltages and multiple second voltages from the voltage sensor in real time. The third voltage and the fourth voltage are obtained through calculation. Exemplarily, the average value of the remaining first voltages after removing one maximum first voltage and one minimum first voltage from the multiple first voltages is called the first average voltage. This first average voltage is the third voltage. The average value of the remaining second voltages after removing one maximum second voltage and one minimum second voltage from the multiple second voltages is called the second average voltage. This second average voltage is the fourth voltage. Since the BMS can obtain multiple first voltages and multiple second voltages in real time, the BMS can obtain the third voltage and the fourth voltage in real time.

[0068] The following will describe in detail step 103 above, that is, "determine the charging rate of each ternary battery cell in the battery pack according to multiple first voltages and multiple second voltages" in combination with the embodiment of the present invention.

[0069] In an embodiment of the present invention, the BMS can determine the charging rate of each ternary battery cell in the battery pack according to multiple first voltages and multiple second voltages.

[0070] As one possible implementation manner, the charging rate of the target ternary battery cell = (the first voltage corresponding to the target ternary battery cell - the second voltage corresponding to the target ternary battery cell) / (the first moment - the second moment), and the target ternary battery cell is any one of the multiple ternary battery cells in the battery pack.

[0071] The following will describe in detail step 104 above, that is, "determine the average charging rate of each ternary battery cell in the battery pack according to the third voltage and the fourth voltage" in combination with the embodiment of the present invention.

[0072] In an embodiment of the present invention, the BMS can determine the average charging rate of each ternary battery cell in the battery pack according to the third voltage and the fourth voltage.

[0073] As one possible implementation, the average charging rate of the battery cell = (the third voltage - the fourth voltage) / (the first moment - the second moment).

[0074] The following describes in detail step 105 above, that is, "determine whether the tabs of the pole groups in the multiple ternary battery cells in the battery pack are torn according to the respective cell charging rates, the average cell charging rate, and the preset range of the multiple ternary battery cells in the battery pack" in conjunction with the embodiments of the present invention.

[0075] In the embodiments of the present invention, it can be understood that in the first case, assuming that a ternary battery cell is composed of two pole groups, if the tab of one of the pole groups is torn and does not participate in the charge and discharge process, the capacity of this ternary battery cell is half of the capacity of the remaining normal ternary battery cells. Theoretically, the charging rate of this abnormal ternary battery cell is twice that of the remaining normal ternary battery cells, that is, the voltage increases 2 times faster than that of other ternary battery cells. In the second case, assuming that a ternary battery cell is composed of three pole groups, if the tab of one of the pole groups is torn and does not participate in the charge and discharge process, the capacity of this ternary battery cell is two-thirds of the capacity of the remaining normal ternary battery cells. Theoretically, the charging rate of this abnormal ternary battery cell is 1.5 times that of the remaining normal battery cells, that is, the voltage increases 1.5 times faster than that of other battery cells. In the third case, assuming that a ternary battery cell is composed of three pole groups, if the tabs of two of the pole groups are torn and do not participate in the charge and discharge process, the capacity of this ternary battery cell is one-third of the capacity of the remaining normal ternary battery cells. Theoretically, the charging rate of this abnormal ternary battery cell is 3 times that of the remaining normal battery cells, that is, the voltage increases 3 times faster than that of other battery cells. The composition of the ternary battery cell and the tab tearing situation include but are not limited to the above several situations.

[0076] In the embodiments of the present invention, the BMS can determine whether the tabs of the pole groups in the multiple ternary battery cells in the battery pack are torn according to the respective cell charging rates, the average cell charging rate, and the preset range of the multiple ternary battery cells in the battery pack.

[0077] As one possible implementation, determine multiple target ratios, where the multiple target ratios are the ratios of the respective cell charging rates of the multiple ternary battery cells in the battery pack to the average cell charging rate; if at least one of the multiple target ratios is within the preset range, determine that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one of the target ratios in the battery pack are torn.

[0078] In the embodiments of the present invention, as one possible implementation, the number of pole groups of each of the multiple ternary battery cells in the battery pack is m, and m is an integer greater than 1. The preset range is m / (m - 1) ± a preset threshold. At this time, if at least one of the multiple target ratios is within the preset range, determine that the tab of a single pole group (i.e., one pole group) in at least one ternary battery cell corresponding to at least one of the target ratios in the battery pack is torn.

[0079] As one possible implementation, the preset threshold ∈ [0.2, 0.5]. For example, the preset threshold can take values of 0.2, 0.3, 0.4 or 0.5. In an embodiment of the present invention, by way of example, the preset threshold takes a value of 0.3.

[0080] Furthermore, considering the voltage false alarm caused by the voltage sampling jump of the ternary battery cell, resulting in the misdetection of the pole ear tear, a preset time threshold is set in an embodiment of the present invention. As one possible implementation, if the duration of at least one target ratio among a plurality of target ratios within a preset range is greater than the preset time threshold, it is determined that the pole ear of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn.

[0081] Taking the first case as an example, a ternary battery cell consists of two pole groups. If the pole ear of one of the pole groups is torn and does not participate in the charge and discharge process, then m / (m - 1) = 2 / (2 - 1) = 2. The preset range can be set as 2 ± 0.3, that is, 1.7 to 2.3. Then, at this time, if the duration of at least one target ratio among a plurality of target ratios within 1.7 to 2.3 is greater than the preset time threshold, it is determined that the pole ear of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn.

[0082] Taking the second case as an example, a ternary battery cell consists of three pole groups. If the pole ear of one of the pole groups is torn and does not participate in the charge and discharge process, then m / (m - 1) = 3 / (3 - 1) = 1.5. The preset range can be set as 1.5 ± 0.3, that is, 1.2 to 1.8. Then, at this time, if the duration of at least one target ratio among a plurality of target ratios within 1.2 to 1.8 is greater than the preset time threshold, it is determined that the pole ear of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn.

[0083] It should be noted that in response to determining that the pole ear of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn, the BMS sends a request instruction for lowering the high voltage to the vehicle control unit VCU. The request instruction for lowering the high voltage is used to request the entire vehicle to enter the low - voltage state. After receiving the request instruction for lowering the high voltage from the BMS, the VCU sends a feedback instruction for lowering the high voltage to the BMS. The feedback instruction for lowering the high voltage is used to indicate that the entire vehicle can enter the low - voltage state. After receiving the feedback instruction for lowering the high voltage from the VCU, the BMS determines that the entire vehicle enters the low - voltage state.

[0084] It can be understood that in the embodiments of the present invention, it is also possible to determine whether the tabs of the multi-pole groups in a ternary battery cell are torn. Taking the third case as an example, a ternary battery cell is composed of three pole groups, and the tabs of two of the pole groups are torn and do not participate in the charge and discharge process. Then m / (m - 2) = 3 / (3 - 2) = 3. The preset range can be set to 3 ± 0.3, that is, 2.7 to 3.3. At this time, if the duration of at least one of the multiple target ratios within the range of 2.7 to 3.3 is greater than the preset time threshold, it is determined that the tabs of two pole groups in at least one ternary battery cell corresponding to at least one of the multiple target ratios in the battery pack are torn.

[0085] Figure 3 Another flow diagram of a method for detecting tab tearing of pole groups in a ternary battery cell proposed by the embodiments of the present invention. As Figure 3 shown, this flow diagram includes the following steps:

[0086] Step 301, when the BMS powers on and self-checks without faults, it is determined that the vehicle enters the high-voltage state.

[0087] In the embodiments of the present invention, the implementation process of step 301 is the same as that of step 201 and will not be elaborated here.

[0088] Step 302, the BMS determines whether the battery pack is in a charging state.

[0089] In the embodiments of the present invention, the implementation process of step 302 is the same as that of step 202 and will not be elaborated here.

[0090] Step 303, the BMS obtains multiple first voltages, multiple second voltages, as well as a third voltage and a fourth voltage in real time.

[0091] In the embodiments of the present invention, the implementation process of step 303 is the same as that of step 102 and will not be elaborated here.

[0092] Step 304, the BMS determines the charging rate and average charging rate of each ternary battery cell in the battery pack.

[0093] In the embodiments of the present invention, the implementation process of step 304 is the same as that of step 103 and step 104 and will not be elaborated here.

[0094] Step 305, the BMS determines whether at least one of the multiple target ratios is within a preset range, where the multiple target ratios are the ratios of the charging rates of each ternary battery cell in the battery pack to the average charging rate of the battery cell respectively.

[0095] In the embodiments of the present invention, if the BMS determines that at least one of the multiple target ratios is within the preset range, then step 306 is performed; otherwise, step 305 is repeated.

[0096] Step 306, the BMS determines whether the duration of at least one target ratio among multiple target ratios within a preset range is greater than a preset time threshold.

[0097] In an embodiment of the present invention, considering the voltage false alarms caused by the voltage sampling jump of ternary battery cells, resulting in the incorrect detection of pole ear tearing, a preset time threshold is set in this embodiment of the present invention.

[0098] Step 307, the BMS determines that the pole ear of the pole group in at least one ternary battery cell corresponding to at least one target ratio is torn and requests the whole vehicle to enter the next high-voltage state.

[0099] In an embodiment of the present invention, if the BMS determines that the duration of at least one target ratio among multiple target ratios within a preset range is greater than a preset time threshold, it determines that the pole ear of the pole group in at least one ternary battery cell corresponding to at least one target ratio is torn, and requests the whole vehicle to enter the next high-voltage state.

[0100] Exemplarily, the number of pole groups of each of the multiple ternary battery cells is m, where m is an integer greater than 1. The preset range is m / (m - 1) ± a preset threshold.

[0101] In an embodiment of the present invention, as one possible implementation manner, if the duration of at least one target ratio among multiple target ratios within m / (m - 1) ± a preset threshold is greater than a preset time threshold, it is determined that the pole ear of a single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn, and the whole vehicle is requested to enter the next high-voltage state. At this time, the BMS sends a next high-voltage request instruction to the VCU. This next high-voltage request instruction is used to request the whole vehicle to enter the next high-voltage state from the VCU. After receiving the next high-voltage request instruction from the BMS, the VCU sends a next high-voltage feedback instruction to the BMS. This next high-voltage feedback instruction is used to indicate that the whole vehicle can enter the next high-voltage state. After receiving the next high-voltage feedback instruction from the VCU, the BMS determines that the whole vehicle enters the next high-voltage state.

[0102] In an embodiment of the present invention, based on the BMS at the vehicle end, it is determined whether at least one of multiple target ratios (i.e., the ratio of the charging rate of each ternary battery cell in the battery pack to the average charging rate of the battery cells) is within a preset range, so as to determine whether the tab of the electrode group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn. In particular, when the preset range is m / (m - 1) ± a preset threshold, it can be determined that the tab of the single electrode group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack is torn, filling the gap that the vehicle end cannot identify such abnormal ternary battery cells (i.e., ternary battery cells with torn tabs), and improving the monitoring ability of ternary battery cells at the vehicle end; by determining that the duration for which at least one of the multiple target ratios is within the preset range is greater than a preset time threshold, false voltage alarms caused by voltage sampling jumps of ternary battery cells are avoided, so as to wrongly detect tab tearing, and the accuracy of tab tearing detection is improved.

[0103] According to an embodiment of another aspect, a device for detecting tab tearing of an electrode group in a ternary battery cell is provided. Figure 4 The schematic block diagram of the device for detecting tab tearing of an electrode group in a ternary battery cell according to an embodiment is shown. As Figure 4 shown, the device 400 may include: a first determination module 401, an acquisition module 402, a second determination module 403, a third determination module 404, and a fourth determination module 405. Among them, the main functions of each component module are as follows:

[0104] The first determination module 401 is used to determine that the battery pack is in a charging state;

[0105] The acquisition module 402 is used to acquire in real time a plurality of first voltages, a plurality of second voltages, as well as a third voltage and a fourth voltage. The plurality of first voltages are the voltages of each of the plurality of ternary battery cells in the battery pack at a first moment, the plurality of second voltages are the voltages of each of the plurality of ternary battery cells in the battery pack at a second moment, the third voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the first moment, the fourth voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the second moment, and the first moment is the next moment of the second moment;

[0106] The second determination module 403 is used to determine the charging rate of each ternary battery cell in the battery pack according to the plurality of first voltages and the plurality of second voltages;

[0107] The third determination module 404 is used to determine the average charging rate of the plurality of ternary battery cells in the battery pack according to the third voltage and the fourth voltage;

[0108] The fourth determination module 405 is configured to determine whether the tabs of the pole groups in the multiple ternary battery cells in the battery pack are torn according to the respective charging rates of the multiple ternary battery cells in the battery pack, the average charging rate of the battery cells, and a preset range.

[0109] In a possible implementation, the second determination module 403 is specifically configured to determine that the charging rate of the target ternary battery cell = (the first voltage corresponding to the target ternary battery cell - the second voltage corresponding to the target ternary battery cell) / (the first moment - the second moment), where the target ternary battery cell is any one of the multiple ternary battery cells in the battery pack.

[0110] In a possible implementation, the third determination module 404 is specifically configured to determine that the average charging rate of the battery cells = (the third voltage - the fourth voltage) / (the first moment - the second moment).

[0111] In a possible implementation, the fourth determination module 405 is specifically configured to determine a plurality of target ratios, where the plurality of target ratios are the ratios of the respective charging rates of the multiple ternary battery cells in the battery pack to the average charging rate of the battery cells; if at least one of the plurality of target ratios is within the preset range, it is determined that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

[0112] In a possible implementation, the number of pole groups of each of the multiple ternary battery cells in the battery pack is m, where m is an integer greater than 1;

[0113] The preset range is m / (m - 1) ± a preset threshold;

[0114] The fourth determination module 405 is specifically configured to, if at least one of the plurality of target ratios is within the preset range, determine that the tabs of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

[0115] In a possible implementation, the fourth determination module 405 is specifically configured to, if the duration for which at least one of the plurality of target ratios is within the preset range is greater than a preset time threshold, determine that the tabs of the single pole group in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

[0116] In a possible implementation, the device further includes: a judgment module and a low-voltage request module. The judgment module is used to determine that the vehicle enters the high-voltage state after a power-on self-check without faults

[0117] The lower high-voltage request module is specifically configured to issue a lower high-voltage request instruction in response to determining that the tabs of the monopole groups of at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn, and the lower high-voltage request instruction is used to request the entire vehicle to enter the lower high-voltage state.

[0118] In a possible implementation, the preset threshold ∈ [0.2, 0.5].

[0119] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description of the method embodiments. The device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0120] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method described in any one of the foregoing method embodiments are implemented.

[0121] And an electronic device, including:

[0122] One or more processors; and

[0123] A memory associated with the one or more processors, where the memory is used to store program instructions. When the program instructions are read and executed by the one or more processors, the steps of the method described in any one of the foregoing method embodiments are executed.

[0124] An embodiment of the present invention further provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the method described in any one of the foregoing method embodiments are implemented.

[0125] Among them, Figure 5Exemplarily, the architecture of the electronic device is shown, which may specifically include a processor 510, a video display adapter 511, a disk drive 512, an input / output interface 513, a network interface 514, and a memory 520. The above-mentioned processor 510, video display adapter 511, disk drive 512, input / output interface 513, network interface 514, and the memory 520 can be communicatively connected via a communication bus 530.

[0126] Among them, the processor 510 can be implemented in ways such as a general-purpose CPU, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, etc., and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present invention.

[0127] The memory 520 can be implemented in forms such as ROM (Read Only Memory), RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 520 can store an operating system 521 for controlling the operation of the electronic device 500, and a basic input / output system (BIOS) 522 for controlling the low-level operations of the electronic device 500. Additionally, it can also store a web browser 523, a data storage management system 524, and a tab ear tearing detection device 525 for the tab group in the ternary battery cell, etc. The above-mentioned tab ear tearing detection device 525 for the tab group in the ternary battery cell can be the application program that specifically implements the operations of the foregoing steps in the embodiments of the present invention. In short, when implementing the technical solutions provided in the embodiments of the present invention through software or firmware, the relevant program codes are stored in the memory 520 and are called and executed by the processor 510.

[0128] The input / output interface 513 is used to connect to an input / output module to achieve information input and output. The input / output module can be configured as a component in the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. Among them, the input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0129] The network interface 514 is used to connect to a communication module (not shown in the figure) to achieve communication interaction between this device and other devices. Among them, the communication module can achieve communication through a wired method (such as USB, network cable, etc.) or can also achieve communication through a wireless method (such as a mobile network, WIFI, Bluetooth, etc.).

[0130] The bus 530 includes a path for transmitting information between various components of the device, such as the processor 510, the video display adapter 511, the disk drive 512, the input / output interface 513, the network interface 514, and the memory 520.

[0131] It should be noted that although the above devices only show the processor 510, the video display adapter 511, the disk drive 512, the input / output interface 513, the network interface 514, the memory 520, the bus 530, etc., in the specific implementation process, the device may also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above devices may also only include the components necessary to implement the solution of this application, and do not necessarily include all the components shown in the figure.

[0132] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the tearing of tabs of a pole group in a ternary battery cell, which is applied to a battery management system, and is characterized in that, Including: Determine that the battery pack is in a charging state; Obtain in real time a plurality of first voltages, a plurality of second voltages, a third voltage, and a fourth voltage. The plurality of first voltages are the voltages of a plurality of ternary battery cells in the battery pack at a first moment respectively. The plurality of second voltages are the voltages of the plurality of ternary battery cells in the battery pack at a second moment respectively. The third voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the first moment. The fourth voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the second moment. The first moment is the next moment of the second moment; Determine the charging rate of each of the plurality of ternary battery cells in the battery pack according to the plurality of first voltages and the plurality of second voltages; Determine the average charging rate of the plurality of ternary battery cells in the battery pack according to the third voltage and the fourth voltage; Determine whether the tabs of the pole groups in the plurality of ternary battery cells in the battery pack are torn according to the charging rate of each of the plurality of ternary battery cells in the battery pack, the average charging rate of the battery cells, and a preset range.

2. The method according to claim 1, characterized in that The step of determining the charging rate of each of the plurality of ternary battery cells in the battery pack according to the plurality of first voltages and the plurality of second voltages includes: The charging rate of the target ternary battery cell = (the first voltage corresponding to the target ternary battery cell - the second voltage corresponding to the target ternary battery cell) / (the first moment - the second moment), where the target ternary battery cell is any one of the plurality of ternary battery cells in the battery pack.

3. The method according to claim 1, characterized in that, The step of determining the average charging rate of the plurality of ternary battery cells in the battery pack according to the third voltage and the fourth voltage includes: The average charging rate of the battery cells = (the third voltage - the fourth voltage) / (the first moment - the second moment).

4. The method according to any one of claims 1 to 3, characterized in that, The step of determining whether the tabs of the pole groups in the plurality of ternary battery cells in the battery pack are torn according to the charging rate of each of the plurality of ternary battery cells in the battery pack, the average charging rate of the battery cells, and a preset range includes: Determine a plurality of target ratios, where the plurality of target ratios are the ratios of the charging rates of the plurality of ternary battery cells in the battery pack to the average charging rate of the battery cells respectively; If at least one of the plurality of target ratios is within the preset range, determine that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

5. The method according to claim 4, wherein The number of pole groups of each of the plurality of ternary battery cells in the battery pack is m, and m is an integer greater than 1; The preset range is m / (m - 1) ± a preset threshold; The step of, if at least one of the plurality of target ratios is within the preset range, determining that the tabs of the pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn includes: If at least one of the plurality of target ratios is within the preset range, determine that the tabs of the single pole groups in at least one ternary battery cell corresponding to at least one target ratio in the battery pack are torn.

6. The method according to claim 5, characterized in that If at least one of the multiple target ratios is within the preset range, determining that the tabs of the monopolar group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn, includes: If the duration for which at least one of the multiple target ratios is within the preset range is greater than a preset time threshold, determining that the tabs of the monopolar group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn.

7. The method according to claim 6, wherein Before determining that the battery pack is in a charging state, the method further includes: Performing a power-on self-check without faults and determining that the vehicle enters a high-voltage state. After determining that the tabs of the monopolar group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn if the duration for which at least one of the multiple target ratios is within the preset range is greater than a preset time threshold, the method further includes: In response to determining that the tabs of the monopolar group in at least one ternary battery cell corresponding to the at least one target ratio in the battery pack are torn, sending a low-voltage request instruction for requesting the vehicle to enter a low-voltage state.

8. The method according to claim 5 or 6, wherein: The preset threshold ∈ [0.2, 0.5].

9. A tab tearing detection device for an electrode group in a ternary battery cell, characterized in that, Includes: A first determination module for determining that the battery pack is in a charging state; An acquisition module for acquiring in real time a plurality of first voltages, a plurality of second voltages, a third voltage, and a fourth voltage, where the plurality of first voltages are the voltages of a plurality of ternary battery cells in the battery pack at a first moment respectively, the plurality of second voltages are the voltages of the plurality of ternary battery cells in the battery pack at a second moment respectively, the third voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the first moment, the fourth voltage is the average voltage of the plurality of ternary battery cells in the battery pack at the second moment, and the first moment is the next moment of the second moment; A second determination module for determining the charging rate of each of the plurality of ternary battery cells in the battery pack according to the plurality of first voltages and the plurality of second voltages; A third determination module for determining the average charging rate of the plurality of ternary battery cells in the battery pack according to the third voltage and the fourth voltage; A fourth determination module for determining whether the tabs of the pole groups in the plurality of ternary battery cells in the battery pack are torn according to the charging rate of each of the plurality of ternary battery cells in the battery pack, the average charging rate of the battery cells, and a preset range.

10. An electronic device, characterized in that, Includes: A memory and a processor, and the processor and the memory complete communication with each other through a bus; The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 8 by invoking the program instructions.

Images