Method and device for detecting electrical connection of battery in electric vehicle

Abstract

The present application relates to the field of electrical detection technologies, and provides an electrical connection detection method and device for a battery in an electric vehicle. The method includes: obtaining a first impedance value according to voltage values on both sides of a busbar of a power battery and a current value passing through the busbar; obtaining a second impedance value according to the current value and a temperature change amount of the busbar within a preset time window; obtaining a final impedance value of the busbar according to the first impedance value and the second impedance value, so as to determine an electrical connection detection result of the power battery according to the final impedance value. The electrical connection detection method for the battery in the electric vehicle provided by the embodiments of the present application can improve the accuracy and robustness of the electrical connection detection of the power battery.

Description

Technical Field

[0001] The present application relates to the technical field of electrical detection, and particularly relates to a method and device for detecting electrical connection of a battery in an electric vehicle. Background Art

[0002] In recent years, with the rapid development of electric vehicles, due to the loosening of the electrical connection inside the power battery of the electric vehicle or the excessive connection impedance, the busbar connection of the power battery continuously heats up, resulting in the burnout of the battery cells from time to time. In severe cases, this situation may even lead to the thermal runaway of the battery pack of the electric vehicle. Therefore, in order to avoid the thermal runaway of the battery pack caused by the burnout of the battery cells, in related technologies, by detecting the electrical physical quantities of the busbar of the power battery, that is, the voltage and current signals on both sides of the busbar, the impedance of the busbar is calculated through Ohm's law to determine the electrical connection condition of the power battery according to the obtained impedance. However, this detection method only detects the electrical connection through one physical dimension of electrical physical quantities, and the accuracy and robustness of the detection results are not high enough. Summary of the Invention

[0003] The present application aims to at least solve one of the technical problems existing in the related technologies. For this purpose, the present application provides a method for detecting electrical connection of a battery in an electric vehicle, which can improve the accuracy and robustness of the electrical connection detection of the power battery.

[0004] The present application also provides a device for detecting electrical connection of a battery in an electric vehicle.

[0005] The present application also provides an electronic device.

[0006] The present application also provides a computer-readable storage medium.

[0007] The method for detecting electrical connection of a battery in an electric vehicle according to the first aspect embodiment of the present application includes:

[0008] Obtain a first impedance value according to the voltage value on both sides of the busbar of the power battery and the current value passing through the busbar;

[0009] Obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0010] Obtain the final impedance value of the busbar according to the first impedance value and the second impedance value, and determine the electrical connection detection result of the power battery according to the final impedance value.

[0011] After obtaining the first impedance value based on the voltage values on both sides of the busbar and the current value flowing through the busbar, the final impedance value of the busbar is determined according to the first impedance value and the second impedance value obtained by the current value and the temperature change of the busbar within a preset time window, so as to determine the electrical connection detection result of the power battery according to the final impedance value. Therefore, when detecting the electrical connection, in addition to electrical physical quantities, the temperature change is also combined to determine the electrical connection of the power battery, thereby improving the accuracy and robustness of the electrical connection detection of the power battery.

[0012] According to an embodiment of the present application, obtaining the first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar includes:

[0013] Obtaining a first initial impedance value according to the voltage value and the current value;

[0014] Obtaining the first impedance value according to the first initial impedance value and a first preset confidence coefficient;

[0015] Wherein, the first preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0016] According to an embodiment of the present application, obtaining the second impedance value according to the current value and the temperature change of the busbar within a preset time window includes:

[0017] Obtaining a second initial impedance value according to the current value and the temperature change of the busbar within a preset time window;

[0018] Obtaining the second impedance value according to the second initial impedance value and a second preset confidence coefficient;

[0019] Wherein, the second preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0020] According to an embodiment of the present application, obtaining the second initial impedance value according to the current value and the temperature change of the busbar within a preset time window includes:

[0021] Inputting the current value and the temperature change into the impedance operation model R2 = (C * M * δT) / (I 2 * δt) to obtain the second initial impedance value;

[0022] Wherein, R2 is the second initial impedance value, C is the specific heat capacity, M is the mass of the busbar, δT is the temperature change, δt is the duration of the preset time window, and I is the current value.

[0023] According to an embodiment of the present application, the current value is the current value collected from the series loop of the power battery.

[0024] According to an embodiment of the present application, determining the electrical connection detection result of the power battery according to the final impedance value includes:

[0025] Determine that the final impedance value is greater than a preset threshold, and mark the electrical connection detection result as an abnormal electrical connection.

[0026] According to an embodiment of the present application, it further includes:

[0027] Determine that the final impedance value is less than or equal to a preset threshold, and mark the electrical connection detection result as a normal electrical connection.

[0028] The electrical connection detection device for the battery in the electric vehicle according to the embodiment of the second aspect of the present application includes:

[0029] A first impedance acquisition module, configured to acquire a first impedance value according to the voltage value on both sides of the busbar of the power battery and the current value passing through the busbar;

[0030] A second impedance acquisition module, configured to acquire a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0031] An electrical connection detection module, configured to acquire the final impedance value of the busbar according to the first impedance value and the second impedance value, so as to determine the electrical connection detection result of the power battery according to the final impedance value.

[0032] The electronic device according to the embodiment of the third aspect of the present application includes a processor and a memory storing a computer program, and when the processor executes the computer program, it implements the electrical connection detection method for the battery in the electric vehicle described in any of the above embodiments.

[0033] The computer-readable storage medium according to the embodiment of the fourth aspect of the present application stores a computer program thereon, and when the computer program is executed by a processor, it implements the electrical connection detection method for the battery in the electric vehicle described in any of the above embodiments.

[0034] The computer program product according to the embodiment of the fifth aspect of the present application includes: when the computer program is executed by a processor, it implements the electrical connection detection method for the battery in the electric vehicle described in any of the above embodiments.

[0035] One or more of the above technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0036] After obtaining the first impedance value based on the voltage values on both sides of the busbar and the current value flowing through the busbar, the final impedance value of the busbar is determined according to the first impedance value and the second impedance value obtained by the current value and the temperature change amount of the busbar within a preset time window, so as to determine the electrical connection detection result of the power battery according to the final impedance value. Therefore, when performing the electrical connection detection, in addition to electrical physical quantities, the temperature change amount is also combined to determine the electrical connection condition of the power battery, thereby improving the accuracy and robustness of the electrical connection detection of the power battery.

[0037] Further, by using the current value collected from the series circuit of the power battery as the current value flowing through the busbar, the error in the detected current value flowing through the busbar caused by the voltage drop on the busbar is avoided, thereby improving the accuracy of the obtained first impedance value.

[0038] Further, after obtaining the first initial impedance value based on the voltage values on both sides of the busbar and the current value flowing through the busbar, the first impedance value is obtained according to the first initial impedance value and the first preset confidence coefficient determined by the current working state of the electric vehicle, so that the obtained first impedance value takes into account the influence of the working state of the electric vehicle and is more in line with the actual operating conditions of the electric vehicle, thereby improving the accuracy of the subsequent electrical connection detection of the power battery.

[0039] Further, after obtaining the second initial impedance value based on the current value flowing through the busbar and the temperature change amount of the busbar within a preset time window, the second impedance value is obtained according to the second initial impedance value and the second preset confidence coefficient determined by the current working state of the electric vehicle, so that the obtained second impedance value takes into account the influence of the working state of the electric vehicle and is more in line with the actual operating conditions of the electric vehicle, thereby improving the accuracy of the subsequent electrical connection detection of the power battery. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is a flowchart showing the method for detecting the electrical connection of the battery in the electric vehicle provided by the embodiment of the present application;

[0042] Figure 2 It is in the embodiment of the present application Figure 1 It is a flowchart showing a further refinement of the acquisition of the first impedance value in the method for detecting the electrical connection of the battery in the electric vehicle.

[0043] Figure 3 This is a schematic flowchart for further refining the acquisition of the second impedance value in the method for detecting the electrical connection of the battery in the electric vehicle in the embodiments of the present application; Figure 1

[0044] Figure 4 This is a schematic structural diagram of the device for detecting the electrical connection of the battery in the electric vehicle provided by the embodiments of the present application;

[0045] Figure 5 This is a schematic structural diagram of the electronic device provided by the embodiments of the present application. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts shall fall within the protection scope of the present application.

[0047] Next, the method and device for detecting the electrical connection of the battery in the electric vehicle provided by the embodiments of the present application will be introduced and described in detail through several specific embodiments.

[0048] In one embodiment, a method for detecting the electrical connection of the battery in an electric vehicle is provided. This method is applied to an electronic device and is used to detect whether the electrical connection of the battery in the electric vehicle is abnormal. Among them, the electronic device can be a single-chip microcomputer, a control chip, or a server, etc. The server can be an independent server or a server cluster composed of multiple servers, and can also be a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence sampling point devices.

[0049] As Figure 1 shown, a method for detecting the electrical connection of the battery in an electric vehicle provided in this embodiment includes:

[0050] Step 101: Obtain a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar;

[0051] Step 102: Obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0052] Step 103: Obtain the final impedance value of the busbar according to the first impedance value and the second impedance value, and determine the electrical connection detection result of the power battery according to the final impedance value.

[0053] After obtaining the first impedance value through the voltage values on both sides of the busbar and the current value flowing through the busbar, according to the first impedance value and the second impedance value obtained through the current value and the temperature change amount of the busbar within a preset time window, determine the final impedance value of the busbar, and determine the electrical connection detection result of the power battery according to the final impedance value. Thus, when performing the detection of electrical connection, in addition to electrical physical quantities, the temperature change amount is also combined to determine the electrical connection condition of the power battery, thereby improving the accuracy and robustness of the electrical connection detection of the power battery.

[0054] In one embodiment, the busbar of the power battery can be a copper bar between the battery cells or modules of the power battery, and voltage acquisition devices and current acquisition devices can be connected to both sides thereof, such as voltage acquisition chips and current acquisition chips. The voltage acquisition device and the current acquisition device are connected to the electronic device. When performing the electrical connection detection on the power battery in the electric vehicle, the electronic device can collect the voltages on both sides of the busbar by accessing the voltage acquisition device and the current acquisition device connected to both sides of the busbar, and the current value flowing through the busbar. After obtaining the voltage values U on both sides of the busbar and the current value I flowing through the busbar, the first initial impedance value R1 = U / I can be calculated through Ohm's law, and thus the first impedance value can be determined according to the first initial impedance value, such as taking the first initial impedance value R1 as the first impedance value.

[0055] However, considering the voltage drop on the busbar, the current value collected by accessing the current acquisition device on both sides of the busbar is not accurate, which will cause deviation in the calculation result of the first impedance value at this time. For this reason, in one embodiment, the detection of the current value flowing through the busbar can be performed by a current acquisition device, such as a current sensor, on the series loop of the entire power battery pack to collect the current value from the series loop of the power battery. Since the series loop current is equal, the current value collected from the series loop of the power battery can be used as the current value I flowing through the busbar.

[0056] By using the current value collected from the series loop of the power battery as the current value flowing through the busbar, the error in the detected current value flowing through the busbar caused by the voltage drop on the busbar is avoided, thereby improving the accuracy of the obtained first impedance value.

[0057] In one embodiment, while obtaining the current value passing through the busbar, the second impedance value can be obtained based on this current value and the temperature change of the busbar within a preset time window. Herein, the preset time window represents a preset duration, which can be set according to the actual situation, such as 1 minute, etc. The acquisition of the temperature change can be achieved through a temperature acquisition device to collect the temperature values of the busbar within the preset time window at a preset period, such as every 0.1 s. After collecting the temperature values within the preset time window, the temperature change is determined based on the maximum temperature value and the minimum temperature value among these temperature values. For example, the difference between the maximum temperature value and the minimum temperature value is used as the temperature change. This temperature acquisition device can be a temperature sensor, which is arranged around the busbar, such as on both sides of the busbar.

[0058] Since according to Joule's law, Q = I 2 *R2*δt, and at the same time Q = C*M*δT, thus the impedance operation model for the second impedance value can be obtained as (C*M*δT) / (I 2 *δt). At this time, after obtaining the current value flowing through the busbar and the temperature change of the busbar within the preset time window, the current value and the temperature change can be input into the impedance operation model, thereby obtaining the second initial impedance value R2, and the second impedance value is obtained based on this second initial impedance value R2. For example, the second initial impedance value R2 is directly determined as the second impedance value. Herein, C is the specific heat capacity, M is the mass of the busbar, δT is the temperature change, and δt is the duration of the preset time window.

[0059] Through the impedance operation model (C*M*δT) / (I 2 *δt), the second impedance value is determined, thereby ensuring the accuracy of the obtained second impedance value, and further improving the accuracy of subsequent electrical connection detection of the power battery.

[0060] To improve the accuracy of subsequent electrical connection detection of the power battery, in one embodiment, as Figure 2 shown, based on the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar, obtaining the first impedance value includes:

[0061] Step 201, obtaining a first initial impedance value based on the voltage value and the current value;

[0062] Step 202, obtaining the first impedance value based on the first initial impedance value and a first preset confidence coefficient;

[0063] Herein, the first preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0064] Considering that different working states of the electric vehicle will affect the current value and voltage value, resulting in errors in the obtained first impedance value and affecting the accuracy of subsequent electrical connection detection of the power battery. Therefore, in order to improve the accuracy of subsequent electrical connection detection of the power battery, in one embodiment, a first mapping table of preset confidence coefficients of the first initial impedance value can be pre-stored in the electronic device under different working states of the electric vehicle. For example, this first mapping table records that when the electric vehicle is in the charging state, the preset confidence coefficient of the first initial impedance value is 0.8; when the electric vehicle is in the driving state, the preset confidence coefficient of the first initial impedance value is 0.7, etc. The mapping relationship between the working state and the preset confidence coefficient of the first initial impedance value. Among them, the mapping relationship in the first mapping table can be determined through a large number of experiments. When the voltage value U and the current value I are obtained, the first initial impedance value R1 = U / I can be calculated through Ohm's law, and the current working state of the electric vehicle can be detected, so as to obtain the preset confidence coefficient corresponding to the current working state from the first mapping table as the first preset confidence coefficient α. After obtaining the first preset confidence coefficient α, according to the first preset confidence coefficient α and the first initial impedance value R1, the first impedance value αR1 can be obtained.

[0065] After obtaining the first initial impedance value through the voltage value on both sides of the bus bar and the current value flowing through the bus bar, according to the first initial impedance value and the first preset confidence coefficient determined by the current working state of the electric vehicle, the first impedance value is obtained, so that the obtained first impedance value takes into account the influence of the working state of the electric vehicle and is more in line with the actual operating conditions of the electric vehicle, thereby improving the accuracy of subsequent electrical connection detection of the power battery.

[0066] To further improve the accuracy of electrical connection detection of the power battery, in one embodiment, as Figure 3 shown, obtaining a second impedance value according to the current value and the temperature change amount of the bus bar within a preset time window includes:

[0067] Step 301, obtaining a second initial impedance value according to the current value and the temperature change amount of the bus bar within a preset time window;

[0068] Step 302, obtaining the second impedance value according to the second initial impedance value and the second preset confidence coefficient;

[0069] Wherein, the second preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0070] Considering that different operating states of an electric vehicle will generate different temperatures. For example, the temperature generated during charging of the electric vehicle will be relatively high, which will affect the temperature of the busbar, and then lead to an error in the second impedance value, affecting the accuracy of subsequent electrical connection detection of the power battery. Therefore, in order to improve the accuracy of subsequent electrical connection detection of the power battery, in one embodiment, the electronic device may pre-store a second mapping table of the preset confidence coefficient of the second initial impedance value under different operating states of the electric vehicle. For example, this second mapping table records that when the electric vehicle is in the charging state, the preset confidence coefficient of the second initial impedance value is 0.8; when the electric vehicle is in the driving state, the preset confidence coefficient of the second initial impedance value is 0.7, etc., the mapping relationship between the operating state and the preset confidence coefficient of the second initial impedance value. Among them, the mapping relationship in the second mapping table can be determined through a large number of experiments. When the current value I and the temperature change amount δT of the busbar within the preset time window are obtained, the impedance operation model R2 = (C * M * δT) / (I 2 *δt) is used to obtain the second initial impedance value R2, and the current operating state of the electric vehicle is detected, so as to obtain the preset confidence coefficient corresponding to the current operating state from the second mapping table as the second preset confidence coefficient β. After obtaining the second preset confidence coefficient β, according to the second preset confidence coefficient β and the second initial impedance value R2, the first impedance value βR2 can be obtained.

[0071] After obtaining the second initial impedance value through the current value flowing through the busbar and the temperature change amount of the busbar within the preset time window, according to the second initial impedance value and the second preset confidence coefficient determined by the current operating state of the electric vehicle, the second impedance value is obtained, so that the obtained second impedance value takes into account the influence of the operating state of the electric vehicle, is more in line with the actual operating conditions of the electric vehicle, and further improves the accuracy of subsequent electrical connection detection of the power battery.

[0072] In this way, when the first impedance value is αR1 and the second impedance value is βR2, the final impedance value R = αR1 + βR2 can be determined, so that the obtained final impedance value R is accurate enough. And when the first impedance value is αR1 and the second impedance value is βR2, α + β = 1. At this time, the obtained final impedance value R takes into account the electrical physical quantity, the influence of the operating state of the electric vehicle on the electrical physical quantity, the temperature, and the influence of the operating state of the electric vehicle on the temperature, thereby greatly improving the accuracy of the obtained final impedance value R, and further improving the accuracy of the subsequent obtained electrical connection detection result.

[0073] In one embodiment, after obtaining the final impedance value R, the final impedance value R is compared with a preset threshold. If the final impedance value R is greater than the preset threshold, it indicates that a fault has occurred in the electrical connection of the power battery. At this time, the electrical connection detection result is marked as abnormal electrical connection, and an alarm signal is triggered to prompt the corresponding fault information. If the final impedance value R is less than or equal to the preset threshold, it indicates that the electrical connection of the power battery is normal. At this time, the electrical connection detection result is marked as normal electrical connection.

[0074] The electrical connection detection device for a battery in an electric vehicle provided by the present application will be described below. The electrical connection detection device for a battery in an electric vehicle described below can be mutually corresponded and referred to the electrical connection detection method for a battery in an electric vehicle described above.

[0075] In one embodiment, as Figure 4 shown, an electrical connection detection device for a battery in an electric vehicle is provided, including:

[0076] A first impedance acquisition module 210, configured to acquire a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar;

[0077] A second impedance acquisition module 220, configured to acquire a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0078] An electrical connection detection module 230, configured to acquire the final impedance value of the busbar according to the first impedance value and the second impedance value, so as to determine the electrical connection detection result of the power battery according to the final impedance value.

[0079] After acquiring the first impedance value through the voltage values on both sides of the busbar and the current value flowing through the busbar, the final impedance value of the busbar is determined according to the first impedance value and the second impedance value obtained through the current value and the temperature change amount of the busbar within a preset time window, so as to determine the electrical connection detection result of the power battery according to the final impedance value. Thus, when performing the detection of the electrical connection, in addition to electrical physical quantities, the temperature change amount is also combined to determine the electrical connection condition of the power battery, thereby improving the accuracy and robustness of the electrical connection detection of the power battery.

[0080] In one embodiment, the first impedance acquisition module 210 is specifically configured to:

[0081] Acquire a first initial impedance value according to the voltage value and the current value;

[0082] Acquire the first impedance value according to the first initial impedance value and a first preset confidence coefficient;

[0083] Among them, the first preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0084] In one embodiment, the second impedance acquisition module 220 is specifically configured to:

[0085] Obtain a second initial impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0086] Obtain the second impedance value according to the second initial impedance value and a second preset confidence coefficient;

[0087] Among them, the second preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

[0088] In one embodiment, the second impedance acquisition module 220 is specifically configured to:

[0089] Input the current value and the temperature change amount into the impedance operation model R2 = (C * M * δT) / (I 2 * δt) to obtain the second initial impedance value;

[0090] Among them, R2 is the second initial impedance value, C is the specific heat capacity, M is the mass of the busbar, δT is the temperature change amount, δt is the duration of the preset time window, and I is the current value.

[0091] In one embodiment, the current value is the current value collected from the series loop of the power battery.

[0092] In one embodiment, the electrical connection detection module 230 is specifically configured to:

[0093] Determine that the final impedance value is greater than a preset threshold, and mark the electrical connection detection result as an abnormal electrical connection.

[0094] In one embodiment, the electrical connection detection module 230 is specifically configured to:

[0095] Determine that the final impedance value is less than or equal to a preset threshold, and mark the electrical connection detection result as a normal electrical connection.

[0096] Figure 5 Illustrates a schematic diagram of the physical structure of an electronic device, such as Figure 5As shown in the figure, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call a computer program in the memory 830 to execute the electrical connection detection method for the battery in the electric vehicle, for example, including:

[0097] Obtain a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar;

[0098] Obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0099] Obtain the final impedance value of the busbar according to the first impedance value and the second impedance value, and determine the electrical connection detection result of the power battery according to the final impedance value.

[0100] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0101] On the other hand, the embodiments of the present application further provide a storage medium. The storage medium includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the electrical connection detection method for the battery in the electric vehicle provided in the above-mentioned various embodiments, for example, including:

[0102] Obtain a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar;

[0103] Obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window;

[0104] Obtain the final impedance value of the bus bar according to the first impedance value and the second impedance value, so as to determine the electrical connection detection result of the power battery according to the final impedance value.

[0105] The device embodiments described above are merely 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 work.

[0106] 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 also by hardware. Based on such an understanding, the above technical solutions, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has 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 for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. A method for detecting the electrical connection of a battery in an electric vehicle, characterized in that, Including: Obtain a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar; Obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window; Obtain the final impedance value of the busbar according to the first impedance value and the second impedance value, so as to determine the electrical connection detection result of the power battery according to the final impedance value.

2. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 1, characterized in that, Obtaining a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar includes: Obtain a first initial impedance value according to the voltage value and the current value; Obtain the first impedance value according to the first initial impedance value and a first preset confidence coefficient; Wherein, the first preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

3. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 1 or 2, characterized in that, Obtaining a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window includes: Obtain a second initial impedance value according to the current value and the temperature change amount of the busbar within a preset time window; Obtain the second impedance value according to the second initial impedance value and a second preset confidence coefficient; Wherein, the second preset confidence coefficient is determined according to the current working state of the electric vehicle where the power battery is located.

4. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 3, characterized in that, Obtaining a second initial impedance value according to the current value and the temperature change amount of the busbar within a preset time window includes: Input the current value and the temperature change amount into the impedance operation model R2 = (C * M * δT) / (I 2 * δt) to obtain the second initial impedance value; Wherein, R2 is the second initial impedance value, C is the specific heat capacity, M is the mass of the busbar, δT is the temperature change amount, δt is the duration of the preset time window, and I is the current value.

5. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 1, characterized in that, The current value is the current value collected from the series circuit of the power battery.

6. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 1, characterized in that, Determining the electrical connection detection result of the power battery according to the final impedance value includes: Determine that the final impedance value is greater than a preset threshold, and mark the electrical connection detection result as an abnormal electrical connection.

7. The method for detecting the electrical connection of a battery in an electric vehicle according to claim 6, characterized in that, Also including: Determine that the final impedance value is less than or equal to the preset threshold, and mark the electrical connection detection result as a normal electrical connection.

8. An electrical connection detection device for a battery in an electric vehicle, characterized in that, Including: A first impedance acquisition module, configured to obtain a first impedance value according to the voltage values on both sides of the busbar of the power battery and the current value passing through the busbar; A second impedance acquisition module, configured to obtain a second impedance value according to the current value and the temperature change amount of the busbar within a preset time window; An electrical connection detection module, configured to obtain the final impedance value of the busbar according to the first impedance value and the second impedance value, so as to determine the electrical connection detection result of the power battery according to the final impedance value.

9. An electronic device, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the electrical connection detection method of the battery in the electric vehicle according to any one of claims 1 to 7.

10. A computer-readable storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by the processor, it implements the electrical connection detection method of the battery in the electric vehicle according to any one of claims 1 to 7.

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