Arc detection method, apparatus, device, and storage medium

Abstract

The application relates to an arc detection method, device, equipment and storage medium. The method comprises the following steps: firstly, exciting a battery pack to be detected to output a changing current; then, performing first periodic collection and processing on an electric output parameter of the battery pack, obtaining an equivalent direct-current internal resistance change value of the battery pack, and determining whether the equivalent direct-current internal resistance change value is greater than a first threshold value determined according to an equivalent direct-current internal resistance of the battery pack in a normal state; if the equivalent direct-current internal resistance change value is greater than the first threshold value, performing second periodic collection and processing on the electric output parameter of the battery pack, obtaining an equivalent direct-current internal resistance of the battery pack, and determining whether the equivalent direct-current internal resistance is a negative value and the amplitude is greater than a second threshold value determined according to a volt-ampere characteristic of series arcs; finally, determining whether the battery pack has the series arcs according to the determination result. The method can accurately detect whether the series arcs appear in the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of arc detection, and in particular to an arc detection method, device, equipment and storage medium. BACKGROUND

[0002] During the operation of a battery system, as the voltage of the battery rises, due to reasons such as line corrosion and aging, loose connection, and contact failure, a series arc problem is likely to occur inside the battery system. If the series arc is not detected and processed in a timely manner, the battery system will be subject to problems such as thermal runaway, thereby causing damage to the battery system.

[0003] At present, in the traditional technology, the arc detection device based on the battery system cannot accurately identify whether a series arc exists because the acquired current signal and voltage signal contain both the voltage characteristics of the battery and the voltage characteristics of the arc. SUMMARY

[0004] Therefore, it is necessary to provide an arc detection method, device, equipment and storage medium capable of detecting whether a series arc occurs in a battery pack.

[0005] In a first aspect, the present application provides an arc detection method. The method comprises: exciting a battery pack to be detected to output a varying current; performing first periodic collection processing on an electrical output parameter of the battery pack to obtain an equivalent direct current resistance change value of the battery pack, and determining whether the equivalent direct current resistance change value is greater than a first threshold value, the first threshold value being determined according to an equivalent direct current resistance of the battery pack in a normal state; if yes, performing second periodic collection processing on the electrical output parameter of the battery pack to obtain an equivalent direct current resistance of the battery pack, and determining whether the equivalent direct current resistance is a negative value and the amplitude is greater than a second threshold value, the second threshold value being determined according to a volt-ampere characteristic of a series arc; and determining whether the battery pack has a series arc according to the determination result.

[0006] In one of the embodiments, the exciting the battery pack to be detected to output the varying current comprises: sending a control instruction to a current transformer connected to the battery pack to make the battery pack output the varying current.

[0007] In one of the embodiments, the electrical output parameter comprises a current value output by the battery pack, and the performing the second periodic collection processing on the electrical output parameter of the battery pack to obtain the equivalent direct current resistance of the battery pack comprises: performing the second periodic collection processing on the electrical output parameter of the battery pack, and determining whether a change value of the current value output by the battery pack is greater than a third threshold value according to the collected electrical output parameter; the third threshold value being determined according to the electrical output parameter collected in the first periodic collection processing; and if yes, obtaining the equivalent direct current resistance of the battery pack according to the electrical output parameter collected in the second periodic collection processing.

[0008] In one of the embodiments, the method further comprises: if no, sending a control instruction to the converter to change the current value output by the battery pack, and re-executing the step of periodically collecting the electrical output parameter of the battery pack for the second time after the current value output by the battery pack is changed.

[0009] In one of the embodiments, the first threshold value is a product of the value of the equivalent DC internal resistance in the normal operation process of the battery pack and a first preset coefficient.

[0010] In one of the embodiments, the third threshold value is a product of the electrical output parameter collected by the battery pack in the first sampling process and a second preset coefficient.

[0011] In one of the embodiments, the sampling period of the first periodic collection process is greater than the sampling period of the second periodic collection process.

[0012] In a second aspect, the application further provides an arc detection device. The device comprises:

[0013] an excitation module configured to excite the battery pack to output a varying current;

[0014] a first collection module configured to periodically collect an electrical output parameter of the battery pack for the first time to obtain a change value of the equivalent DC internal resistance of the battery pack, and determine whether the change value of the equivalent DC internal resistance is greater than a first threshold value, the first threshold value being determined according to the equivalent DC internal resistance of the battery pack in a normal state;

[0015] a second collection module configured to, if yes, periodically collect the electrical output parameter of the battery pack for the second time to obtain the equivalent DC internal resistance of the battery pack, and determine whether the equivalent DC internal resistance is a negative value and the amplitude is greater than a second threshold value, the second threshold value being determined according to the volt-ampere characteristic of the series arc;

[0016] a determination module configured to determine whether the series arc exists in the battery pack according to the determination result.

[0017] In one of the embodiments, the excitation module is specifically configured to send a control instruction to a converter connected to the battery pack to make the battery pack output a varying current.

[0018] In one of the embodiments, the second collection module is specifically configured to periodically collect the electrical output parameter of the battery pack for the second time, and determine whether the change value of the current value output by the battery pack is greater than a third threshold value according to the collected electrical output parameter; the third threshold value is determined according to the electrical output parameter collected by the battery pack in the first periodic collection process; if yes, obtain the equivalent DC internal resistance of the battery pack according to the electrical output parameter collected in the second periodic collection process.

[0019] In one of the embodiments, the second collecting module is specifically configured to send a control instruction to the converter to change the current value output by the battery pack, and after the current value output by the battery pack is changed, the step of performing the second periodic collecting process on the electrical output parameter of the battery pack is re-executed.

[0020] In one of the embodiments, the first threshold value is a product of the value of the equivalent DC internal resistance in the normal operation process of the battery pack and a first preset coefficient.

[0021] In one of the embodiments, the third threshold value is a product of the electrical output parameter collected by the first sampling process and a second preset coefficient.

[0022] In one of the embodiments, the sampling period of the first periodic collecting process is greater than the sampling period of the second periodic collecting process.

[0023] In a third aspect, the present application further provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor implements the arc detection method of any one of the first aspect when executing the computer program.

[0024] In a fourth aspect, the present application further provides a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the arc detection method of any one of the first aspect.

[0025] In a fifth aspect, the present application further provides a computer program product. The computer program product comprises a computer program, and the computer program is executed by a processor to implement the arc detection method of any one of the first aspect.

[0026] The arc detection method, device, equipment and storage medium, first, the battery pack to be detected is stimulated to output a changing current; then, the electrical output parameter of the battery pack is collected and processed periodically for the first time, the equivalent DC internal resistance change value of the battery pack is obtained, and it is determined whether the equivalent DC internal resistance change value is greater than a first threshold value determined according to the equivalent DC internal resistance of the battery pack in a normal state. If the first threshold value is greater, the electrical output parameter of the battery pack is collected and processed periodically for the second time, the equivalent DC internal resistance of the battery pack is obtained, and it is determined whether the equivalent DC internal resistance is a negative value and the amplitude is greater than a second threshold value determined according to the volt-ampere characteristic of the series arc. Finally, according to the determination result, it is determined whether the series arc exists in the battery pack. In this way, by periodically detecting the electrical output parameter of the battery pack, the equivalent DC internal resistance change value of the battery pack is calculated according to the electrical output parameter, and the first threshold value is judged. If the first threshold value is greater, the electrical output parameter of the battery pack is collected and processed periodically for the second time, then the equivalent DC internal resistance of the battery pack is calculated, and the second threshold value is judged. The volt-ampere characteristic of the arc is distinguished from the volt-ampere characteristic of the battery pack through the judgment of the first threshold value and the second threshold value. Then, according to the judgment result, whether the series arc exists in the battery pack can be accurately determined.

[0027] Further, the detection process can be completed without additional new hardware devices, and the detection method has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The circuit topology diagram for the application of the arc detection method in one embodiment;

[0029] Figure 2 The flowchart of the arc detection method in one embodiment;

[0030] Figure 3 The flowchart of the arc detection method in another embodiment;

[0031] Figure 4 The flowchart of the arc detection method in another embodiment;

[0032] Figure 5 The flowchart of the arc detection method in another embodiment;

[0033] Figure 6 The electrical output parameter of the arc detection method in another embodiment;

[0034] Figure 7 The structural block diagram of the arc detection device in one embodiment;

[0035] Figure 8 The internal structure diagram of the computer equipment in one embodiment. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] The arc detection method provided in this application embodiment can be applied to, for example... Figure 1 In the circuit topology shown, battery pack 10 is connected to inverter 20. Inverter controller 30 controls the operation of inverter 20 through control commands. The input terminal of inverter 20 is equipped with voltage acquisition circuit and current acquisition circuit. Inverter 20 can be a DC / DC (direct current to direct current) inverter or a DC / AC (direct current to alternating current) inverter.

[0038] In one embodiment, such as Figure 2 As shown, a series arc detection method is provided, which is applied to... Figure 1 Taking the converter controller in the example, the following steps are included:

[0039] Step 201: Excite the battery pack to be tested to output a changing current.

[0040] like Figure 1 In the circuit topology shown, during battery pack operation, the output current fluctuates under the excitation of the converter, and the battery pack generates fluctuating terminal voltage under current polarization. The converter controller controls the operation of the converter, stimulating the battery pack to output varying current.

[0041] Step 202: Perform the first periodic acquisition and processing of the battery pack's electrical output parameters to obtain the equivalent DC internal resistance change value of the battery pack, and determine whether the equivalent DC internal resistance change value is greater than the first threshold.

[0042] The first threshold is determined based on the equivalent DC internal resistance of the battery pack under normal conditions. Optionally, the first threshold is determined based on a multiple of the equivalent DC internal resistance of the battery pack under normal conditions. The electrical output parameters of the battery pack include the current and voltage, which are acquired by voltage and current acquisition circuits set at the input of the inverter. The acquisition period for the first periodic acquisition process is the first sampling period, which can optionally be the inherent sampling interval of the inverter.

[0043] According to the first periodic acquisition, the change value of the equivalent DC internal resistance of the battery pack can be calculated. For example, at a certain time when the battery pack is normally operated, the voltage and current of the battery pack, i.e. the voltage and current at the input side of the converter, are acquired and recorded by the voltage acquisition circuit and the current acquisition circuit at the input end of the converter. Then, after the first sampling period, the voltage value and the current value after the first sampling period interval are acquired and recorded. According to the two recorded voltage values and current values, the first equivalent DC internal resistance of the battery pack can be obtained. The specific calculation method is the ratio of the difference between the two recorded voltage values to the difference between the two recorded current values. Then, after the first sampling period, the voltage value and the current value are acquired and recorded. According to the voltage value and the current value recorded in the adjacent sampling period, the second equivalent DC internal resistance is calculated. The difference between the second equivalent DC internal resistance and the first equivalent DC internal resistance is the change value of the equivalent DC internal resistance. Finally, it is determined whether the change value of the equivalent DC internal resistance is greater than the first threshold value.

[0044] In step 203, if yes, the second periodic acquisition processing is performed on the electrical output parameters of the battery pack to obtain the equivalent DC internal resistance of the battery pack, and it is determined whether the equivalent DC internal resistance is a negative value and the amplitude is greater than the second threshold value.

[0045] The second threshold value is determined according to the volt-ampere characteristic of the series arc. Optionally, the second threshold value is the product of the slope of the volt-ampere characteristic curve of the series arc at the current value position obtained under the normal operating state of the battery pack and a coefficient less than 1. The sampling period of the second periodic acquisition processing is the second sampling period. After the second periodic acquisition processing, the equivalent DC internal resistance of the battery pack is calculated according to the two acquired voltage values and current values, and it is determined whether the equivalent DC internal resistance is a negative value and the amplitude is greater than the second threshold value.

[0046] In step 204, according to the determination result, it is determined whether the series arc exists in the battery pack.

[0047] If the equivalent DC internal resistance of the battery pack calculated in the above steps is a negative value and the amplitude is greater than the second threshold value, it can be determined that the series arc does not occur inside the battery pack. If the condition is not met, the series arc does not occur, and the battery pack exits the arc detection state and returns to the normal operating state for continuous operation.

[0048] The arc detection method first stimulates the battery pack to be detected to output a varying current, then performs first periodic collection and processing on the electrical output parameters of the battery pack to obtain a varying value of the equivalent DC internal resistance of the battery pack, and determines whether the varying value of the equivalent DC internal resistance is greater than a first threshold value determined according to the equivalent DC internal resistance of the battery pack in a normal state. If the varying value of the equivalent DC internal resistance is greater than the first threshold value, the electrical output parameters of the battery pack are subjected to second periodic collection and processing to obtain the equivalent DC internal resistance of the battery pack, and it is determined whether the equivalent DC internal resistance is a negative value and has an amplitude greater than a second threshold value determined according to the volt-ampere characteristic of the series arc. Finally, according to the determination result, it is determined whether the series arc exists in the battery pack. In this way, the electrical output parameters of the battery pack are periodically detected, the varying value of the equivalent DC internal resistance of the battery pack is calculated according to the electrical output parameters, and the first threshold value is determined. If the varying value of the equivalent DC internal resistance is greater than the first threshold value, the electrical output parameters of the battery pack are subjected to second periodic collection, the equivalent DC internal resistance of the battery pack is calculated, and the second threshold value is determined. The volt-ampere characteristic of the arc is distinguished from the volt-ampere characteristic of the battery pack through the determination of the first threshold value and the second threshold value. Then, according to the determination result, it can be accurately determined whether the series arc exists in the battery pack.

[0049] Further, the detection process does not require additional new hardware devices to complete the detection of the series arc, and the detection method has low cost.

[0050] In an embodiment of the present application, stimulating the battery pack to be detected to output a varying current comprises: sending a control instruction to a current transformer connected to the battery pack to make the battery pack output a varying current.

[0051] According to Figure 1 As shown in the circuit topology, the current transformer controller controls the operation process of the current transformer, the current transformer controller sends a control instruction to the current transformer connected to the battery pack, and the battery pack outputs a fluctuating varying current under the excitation action of the current transformer.

[0052] In an embodiment, the electrical output parameters include a current value output by the battery pack, and the step of performing second periodic collection and processing on the electrical output parameters of the battery pack to obtain the equivalent DC internal resistance of the battery pack further comprises: Figure 3

[0053] Step 301, performing second periodic collection and processing on the electrical output parameters of the battery pack, and determining whether the varying value of the current value output by the battery pack is greater than a third threshold value according to the collected electrical output parameters.

[0054] ​The third threshold value is determined according to the electric output parameter collected by the first periodic collection process. Optionally, the third threshold value is the product of the electric output parameter collected by the first sampling process and a second preset coefficient. The second preset coefficient can be 5%, and the third threshold value is the current value collected by the first sampling process*5%.

[0055] The output of the battery pack is subjected to a second periodic sampling process. Optionally, the sampling period of the second periodic collection process is different from the sampling period of the first periodic collection process. In order to make the operating condition of the battery pack meet the judgment condition, the sampling period of the first periodic collection process is set to be greater than the sampling period of the second periodic collection process, that is, the sampling period of the second periodic collection process is less than the sampling period of the first periodic collection process.

[0056] The voltage value and the current value at this moment are obtained through the second periodic collection process. The current change value is determined according to the current values obtained by the two samplings, and it is judged whether the current change value is greater than the third threshold value. If yes, step 302 is executed, and if no, step 303 is executed.

[0057] Step 302, if yes, the equivalent direct current resistance of the battery pack is obtained according to the electric output parameter collected by the second periodic collection process.

[0058] When it is determined that the current change value is greater than the third threshold value, it indicates that the current condition meets the judgment condition of the arc detection, and then the equivalent direct current resistance of the battery pack is calculated according to the current value and the voltage value collected by the second periodic collection process, and the next step of the arc detection is performed.

[0059] Step 303, if no, a control instruction is sent to the converter to change the current value output by the battery pack, and after the current value output by the battery pack is changed, the step of performing the second periodic collection process on the electric output parameter of the battery pack is re-executed.

[0060] When it is determined that the current change value is not greater than the third threshold value, it indicates that the current condition does not meet the judgment condition of the arc detection, and the converter controller sends a control instruction to the converter to change the current value output by the battery pack. After the current value output by the battery pack is changed, the voltage and the current of the battery pack are collected according to the second sampling period, and then the judgment of step 301 is continued until the current change value is greater than the third threshold value.

[0061] In the above embodiment, by setting the third threshold value, the current change value of the battery pack is judged. If the current change value of the battery pack does not meet the judgment condition, that is, the operating condition of the battery pack does not meet the judgment condition of the arc detection, the converter is actively adjusted to change the current value, so that the system can meet the judgment condition faster, and the efficiency of the arc detection process is improved.

[0062] In an optional embodiment, the first threshold value is a product of the value of the equivalent DC internal resistance in the normal operation process of the battery pack and a first preset coefficient.

[0063] The first preset coefficient can be 10%. Optionally, the first threshold value can further include a safety margin, i.e., a sum of the product of the value of the equivalent DC internal resistance in the normal operation process of the battery pack and 10% and the safety margin. The safety margin can be set according to the scenario of arc detection as required. The smaller the safety margin, the higher the accuracy of arc detection.

[0064] In the embodiments of the present application, as shown in Figure 4 , a method for detecting arc provided by the embodiments of the present application is shown, which includes the following steps:

[0065] Step 401: A varying current is excited to be output by the battery pack to be detected.

[0066] Step 402: A first periodic collection and processing is performed on the electrical output parameters of the battery pack to obtain a varying value of the equivalent DC internal resistance of the battery pack, and it is determined whether the varying value of the equivalent DC internal resistance is greater than a first threshold value.

[0067] Step 403: If yes, a second periodic collection and processing is performed on the electrical output parameters of the battery pack, and it is determined whether a varying value of the current value output by the battery pack is greater than a third threshold value according to the collected electrical output parameters.

[0068] Step 404: If yes, the equivalent DC internal resistance of the battery pack is obtained according to the electrical output parameters collected in the second periodic collection and processing.

[0069] Step 405: If no, a control instruction is sent to the converter to change the current value output by the battery pack, and after the current value output by the battery pack is changed, the step of performing the second periodic collection and processing on the electrical output parameters of the battery pack is re-executed.

[0070] Step 406: It is determined whether the equivalent DC internal resistance is a negative value and the amplitude is greater than a second threshold value.

[0071] Step 407: According to the determination result, it is determined whether the battery pack has a series arc.

[0072] In order to facilitate the reader to understand the technical solutions provided by the embodiments of the present application, the overall flow of the arc detection method of the present application is exemplarily described below. For the specific flow of the arc detection method, please refer to Figure 5 . The varying conditions of the current and voltage at the input end of the battery pack are shown in Figure 6 . n , n+2 , n+3 , n+4 , n+5to sample at different time intervals.

[0073] (1) First sampling, at any starting time t of normal operation of the battery pack n , record the current I n and voltage U n of the input side of the converter through the current acquisition circuit and the voltage acquisition circuit.

[0074] (2) After the first sampling period δ t1 , record the current I n+1 and voltage U n+1 of the input side of the converter through the current acquisition circuit and the voltage acquisition circuit, and calculate the equivalent DC internal resistance R n+1 of the battery pack = (U n+1 -U n ) / (I n+1 -I n ).

[0075] (3) After the same time interval δt1, record the current I n+2 and voltage U n+2 of the input side of the converter, and calculate the equivalent DC internal resistance R n+2 of the battery pack = (U n+2 -U n+1 ) / (I n+2 -I n+1 ).

[0076] (4) The first threshold value is (10%*R n+1 + safety margin), the equivalent DC internal resistances calculated in steps (2) and (3) are two times of sampling, and the change value of the equivalent DC internal resistance is the difference between R n+2 and R n+1 . If the change value of the equivalent DC internal resistance (R n+2 -R n+1 ) is less than the first threshold value, return to step (3) for continuous operation; if the change value of the equivalent DC internal resistance is greater than the first threshold value, proceed to the next step for judgment.

[0077] (5) Sampling of the converter after the second sampling period δ t2 (δ t2 < δ t1 ), record the current I t and voltage U t at this time, and judge whether the current change value |I n+2 -I t | is greater than the third threshold value, which is 5%*I n+2 .

[0078] (6) If the current change value is greater than the third threshold value, calculate the equivalent DC internal resistance R of the battery pack t = (U t – U n+2 ) / (I t – I n+2 ), determine whether the equivalent DC internal resistance R t is negative and whether the amplitude of the equivalent DC internal resistance is greater than the second threshold value.

[0079] (7) If the equivalent DC internal resistance meets the determination condition, it can be determined that a series arc occurs in the battery pack, and if the determination condition is not met, there is no series arc in the battery pack, and the battery pack returns to the normal working state.

[0080] (8) If the current change value in step (5) is not greater than the third threshold value, the converter controller outputs a control instruction to change the current of the battery pack, and then the sampling determination of step (5) is performed again.

[0081] It should be understood that although each step in the flowchart involved in each of the above embodiments is displayed in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, as described above, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0082] Based on the same inventive concept, the embodiments of the present application also provide an arc detection device for implementing the above-mentioned arc detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more arc detection device embodiments provided below can refer to the limitations of the arc detection method in the above text, which will not be repeated here.

[0083] In one embodiment, as shown in Figure 7 , an arc detection device 700 is provided, comprising an excitation module 701, a first acquisition module 702, a second acquisition module 703 and a determination module 704, wherein:

[0084] The excitation module 701 is configured to excite the battery pack to be detected to output a varying current;

[0085] The first acquisition module 702 is configured to perform first periodic acquisition processing on the electrical output parameters of the battery pack to obtain a change value of the equivalent DC internal resistance of the battery pack, and determine whether the change value of the equivalent DC internal resistance is greater than a first threshold value, the first threshold value being determined according to the equivalent DC internal resistance of the battery pack in a normal state.

[0086] The second acquisition module 703 is configured to, if yes, perform second periodic acquisition processing on the electrical output parameters of the battery pack to obtain the equivalent DC internal resistance of the battery pack, and determine whether the equivalent DC internal resistance is a negative value and has an amplitude greater than a second threshold value, the second threshold value being determined according to the volt-ampere characteristic of the series arc.

[0087] The determination module 704 is configured to determine, according to the determination result, whether the series arc exists in the battery pack.

[0088] In one embodiment, the excitation module is specifically configured to send a control instruction to a converter connected to the battery pack, so that the battery pack outputs a varying current.

[0089] In one embodiment, the second acquisition module 703 is specifically configured to perform the second periodic acquisition processing on the electrical output parameters of the battery pack, and determine, according to the acquired electrical output parameters, whether a change value of the current value output by the battery pack is greater than a third threshold value; the third threshold value being determined according to the electrical output parameters acquired in the first periodic acquisition processing; if yes, the equivalent DC internal resistance of the battery pack is obtained according to the electrical output parameters acquired in the second periodic acquisition processing.

[0090] In one embodiment, the second acquisition module 703 is specifically configured to, if no, send a control instruction to the converter to change the current value output by the battery pack, and re-perform the step of performing the second periodic acquisition processing on the electrical output parameters of the battery pack after the current value output by the battery pack is changed.

[0091] In one embodiment, the first threshold value is a product of a value of the equivalent DC internal resistance of the battery pack in a normal operation process and a first preset coefficient.

[0092] In one embodiment, the third threshold value is a product of the electrical output parameters acquired in the first sampling processing and a second preset coefficient.

[0093] In one embodiment, a sampling period of the first periodic acquisition processing is greater than a sampling period of the second periodic acquisition processing.

[0094] Each of the modules in the arc detection device described above can be implemented in whole or in part by software, hardware, and combinations thereof. The modules described above can be embedded in the processor in the computer device in hardware form or independent of the processor in the computer device, or can be stored in the memory in the computer device in software form to be invoked by the processor to perform the operations corresponding to each of the modules.

[0095] In one embodiment, a computer device, which can be a terminal, is provided, and an internal structure diagram of the computer device can be as shown in Figure 8 The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be achieved through WIFI, mobile cellular network, NFC (Near Field Communication), or other technologies. The computer program is executed by the processor to implement an arc detection method. The display unit of the computer device is configured to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer overlaid on the display screen, or can be a key, a trackball, or a touchpad arranged on the shell of the computer device, or can be an external keyboard, a touchpad, a mouse, or the like.

[0096] Those skilled in the art can understand that Figure 8 The structure shown in the above description is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0097] In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program: stimulating the battery pack to output a varying current; performing a first periodic sampling process on the electrical output parameter of the battery pack to obtain a change value of the equivalent DC internal resistance of the battery pack, and determining whether the change value of the equivalent DC internal resistance is greater than a first threshold value, the first threshold value being determined according to the equivalent DC internal resistance of the battery pack in a normal state; if yes, performing a second periodic sampling process on the electrical output parameter of the battery pack to obtain the equivalent DC internal resistance of the battery pack, and determining whether the equivalent DC internal resistance is a negative value and the amplitude is greater than a second threshold value, the second threshold value being determined according to the volt-ampere characteristic of the series arc; and determining whether the series arc exists in the battery pack according to the determination result.

[0098] In one embodiment, the processor further implements the following step when executing the computer program: sending a control instruction to a converter connected with the battery pack to make the battery pack output a varying current.

[0099] In one embodiment, the electrical output parameter comprises a current value output by the battery pack, and the processor further implements the following step when executing the computer program: performing the second periodic sampling process on the electrical output parameter of the battery pack, and determining whether the change value of the current value output by the battery pack is greater than a third threshold value according to the sampled electrical output parameter; the third threshold value being determined according to the electrical output parameter sampled in the first periodic sampling process; and if yes, obtaining the equivalent DC internal resistance of the battery pack according to the electrical output parameter sampled in the second periodic sampling process.

[0100] In one embodiment, the processor further implements the following step when executing the computer program: if no, sending a control instruction to the converter to change the current value output by the battery pack, and re-executing the step of performing the second periodic sampling process on the electrical output parameter of the battery pack after the current value output by the battery pack is changed.

[0101] In one embodiment, the first threshold value is a product of the value of the equivalent DC internal resistance of the battery pack in a normal operation process and a first preset coefficient.

[0102] In one embodiment, the third threshold value is a product of the electrical output parameter sampled in the first sampling process and a second preset coefficient.

[0103] In one embodiment, the sampling period of the first periodic sampling process is greater than the sampling period of the second periodic sampling process.

[0104] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the following steps: exciting a battery pack to output a varying current; performing a first periodic sampling process on an electrical output parameter of the battery pack to obtain a change value of an equivalent DC internal resistance of the battery pack, and determining whether the change value of the equivalent DC internal resistance is greater than a first threshold value, the first threshold value being determined according to the equivalent DC internal resistance of the battery pack in a normal state; if yes, performing a second periodic sampling process on the electrical output parameter of the battery pack to obtain the equivalent DC internal resistance of the battery pack, and determining whether the equivalent DC internal resistance is a negative value and has an amplitude greater than a second threshold value, the second threshold value being determined according to a volt-ampere characteristic of a series arc; and determining, according to the determination result, whether the battery pack has the series arc.

[0105] In one embodiment, the computer program, when executed by the processor, further implements the following step: sending a control instruction to a converter connected to the battery pack to make the battery pack output the varying current.

[0106] In one embodiment, the electrical output parameter includes a current value output by the battery pack, and the computer program, when executed by the processor, further implements the following steps: performing the second periodic sampling process on the electrical output parameter of the battery pack, and determining, according to the sampled electrical output parameter, whether a change value of the current value output by the battery pack is greater than a third threshold value; the third threshold value being determined according to the electrical output parameter sampled by the battery pack in the first periodic sampling process; and if yes, obtaining the equivalent DC internal resistance of the battery pack according to the electrical output parameter sampled in the second periodic sampling process.

[0107] In one embodiment, the computer program, when executed by the processor, further implements the following steps: if no, sending a control instruction to the converter to change the current value output by the battery pack, and re-executing the step of performing the second periodic sampling process on the electrical output parameter of the battery pack after the current value output by the battery pack is changed.

[0108] In one embodiment, the first threshold value is a product of a value of the equivalent DC internal resistance of the battery pack in a normal operation process and a first preset coefficient.

[0109] In one embodiment, the third threshold value is a product of the electrical output parameter sampled by the battery pack in the first sampling process and a second preset coefficient.

[0110] In one embodiment, a sampling period of the first periodic sampling process is greater than a sampling period of the second periodic sampling process.

[0111] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the following steps: stimulating the battery pack to output a varying current; performing a first periodic sampling process on the electrical output parameter of the battery pack to obtain a change value of the equivalent DC internal resistance of the battery pack, and determining whether the change value of the equivalent DC internal resistance is greater than a first threshold value, the first threshold value being determined according to the equivalent DC internal resistance of the battery pack in a normal state; if yes, performing a second periodic sampling process on the electrical output parameter of the battery pack to obtain the equivalent DC internal resistance of the battery pack, and determining whether the equivalent DC internal resistance is a negative value and the amplitude is greater than a second threshold value, the second threshold value being determined according to the volt-ampere characteristic of the series arc; and determining whether the series arc exists in the battery pack according to the determination result.

[0112] In one embodiment, the computer program, when executed by the processor, further implements the following step: sending a control instruction to a converter connected to the battery pack to make the battery pack output a varying current.

[0113] In one embodiment, the electrical output parameter comprises a current value output by the battery pack, and the computer program, when executed by the processor, further implements the following steps: performing the second periodic sampling process on the electrical output parameter of the battery pack, and determining whether the change value of the current value output by the battery pack is greater than a third threshold value according to the sampled electrical output parameter; the third threshold value being determined according to the electrical output parameter sampled by the battery pack in the first periodic sampling process; and if yes, obtaining the equivalent DC internal resistance of the battery pack according to the electrical output parameter sampled in the second periodic sampling process.

[0114] In one embodiment, the computer program, when executed by the processor, further implements the following steps: if no, sending a control instruction to the converter to change the current value output by the battery pack, and re-executing the step of performing the second periodic sampling process on the electrical output parameter of the battery pack after the current value output by the battery pack is changed.

[0115] In one embodiment, the first threshold value is a product of the value of the equivalent DC internal resistance of the battery pack in a normal operation process and a first preset coefficient.

[0116] In one embodiment, the third threshold value is a product of the electrical output parameter sampled by the battery pack in the first sampling process and a second preset coefficient.

[0117] In one embodiment, the sampling period of the first periodic sampling process is greater than the sampling period of the second periodic sampling process.

[0118] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of the country and region.

[0119] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of each method can be included. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0120] The technical features of the above embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0121] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An arc detection method, characterized in that, The method includes: The battery pack under test is excited to output a changing current; The electrical output parameters of the battery pack are periodically collected for the first time to obtain the change value of the equivalent DC internal resistance of the battery pack, and to determine whether the change value of the equivalent DC internal resistance is greater than a first threshold, which is determined based on the equivalent DC internal resistance of the battery pack in normal state. If so, the electrical output parameters of the battery pack are periodically sampled a second time to obtain the equivalent DC internal resistance of the battery pack, and to determine whether the equivalent DC internal resistance is negative and whether the amplitude is greater than the second threshold. The second threshold is determined based on the volt-ampere characteristics of the series arc. Based on the determined results, it is determined whether the battery pack has a series arc.

2. The method according to claim 1, characterized in that, The excitation of the battery pack under test outputs a changing current, including: A control command is sent to the inverter connected to the battery pack to cause the battery pack to output a varying current.

3. The method according to claim 2, characterized in that, The electrical output parameters include the current value output by the battery pack. The second periodic acquisition processing of the electrical output parameters of the battery pack to obtain the equivalent DC internal resistance of the battery pack includes: The electrical output parameters of the battery pack are subjected to a second periodic acquisition process, and the change in the current value output by the battery pack is determined based on the acquired electrical output parameters to determine whether it is greater than a third threshold; the third threshold is determined based on the electrical output parameters of the battery pack acquired during the first periodic acquisition process. If so, the equivalent DC internal resistance of the battery pack is obtained based on the electrical output parameters collected during the second periodic acquisition process.

4. The method according to claim 3, characterized in that, The method further includes: If not, a control command is sent to the inverter to change the current value output by the battery pack, and after the current value output by the battery pack changes, the step of performing a second periodic acquisition and processing of the electrical output parameters of the battery pack is re-executed.

5. The method according to claim 1, characterized in that, The first threshold is the product of the equivalent DC internal resistance of the battery pack during normal operation and a first preset coefficient.

6. The method according to claim 3, characterized in that, The third threshold is the product of the electrical output parameters collected by the battery pack after the first sampling process and the second preset coefficient.

7. The method according to claim 1, characterized in that, The sampling period of the first periodic acquisition process is longer than the sampling period of the second periodic acquisition process.

8. An arc detection device, characterized in that, The device includes: The excitation module is used to excite the battery pack under test to output a changing current; The first acquisition module is used to perform a first periodic acquisition process on the electrical output parameters of the battery pack to obtain the equivalent DC internal resistance change value of the battery pack, and to determine whether the equivalent DC internal resistance change value is greater than a first threshold, which is determined based on the equivalent DC internal resistance of the battery pack in normal state. The second acquisition module is used to perform a second periodic acquisition process on the electrical output parameters of the battery pack if the condition is met, in order to obtain the equivalent DC internal resistance of the battery pack and determine whether the equivalent DC internal resistance is negative and whether the amplitude is greater than a second threshold. The second threshold is determined based on the volt-ampere characteristics of the series arc. The determination module is used to determine whether the battery pack has a series arc based on the determination result.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

Images