Battery system abnormal weld detection method and apparatus

Abstract

The application provides a battery system abnormal welding detection method and device, and relates to the technical field of battery detection. The method comprises the following steps: if all the battery cells and aluminum bars in the battery system do not have a first abnormality, checking the welding positions of all the battery cells and aluminum bars in the battery system; if the welding positions of all the battery cells and aluminum bars in the battery system do not have a second abnormality, obtaining a first parameter of the battery system, the first parameter being used to measure whether the welding positions of the battery cells and aluminum bars are qualified; and if the first parameter of the battery system is not within a preset range, determining that the battery system has a welding abnormality, so that when the battery system has an abnormality during use, the detection of the welding positions of the battery cells and aluminum bars can be quickly realized without damaging the welding positions of the battery cells and aluminum bars.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, and in particular to a method and apparatus for detecting abnormal welding in battery systems. Background Technology

[0002] In the field of new energy, battery systems can be applied to electric vehicles and energy storage devices. A battery system includes a housing and at least one battery module housed within the housing. Each battery module comprises multiple battery cells, which are connected in series and parallel via multiple aluminum busbars. The cells and busbars are electrically connected by welding, and the quality of this welding directly determines the electrical and safety performance of the battery system. When an abnormality occurs during battery system use, the welded joints between the cells and busbars need to be inspected.

[0003] In the existing technology, the inspection of the weld between the battery cell and the aluminum busbar usually requires destructive sectioning of the weld for metallographic testing to measure the weld penetration, weld width and porosity. If the penetration and / or weld width and / or porosity are outside the range, the battery system is judged to have a welding abnormality.

[0004] However, in existing technologies, inspecting the weld between the battery cell and the aluminum busbar requires metallographic testing, which can damage the weld. Summary of the Invention

[0005] This invention provides a method and apparatus for detecting abnormal welding in a battery system, which solves the problem that in the prior art, metallographic testing is required to detect the welding joint between the battery cell and the aluminum busbar, which may damage the welding joint.

[0006] On one hand, embodiments of the present invention provide a method for detecting abnormal welding in a battery system, comprising the following steps:

[0007] If none of the cells and aluminum busbars in the battery system exhibit the first abnormality, then check the welds between all the cells and aluminum busbars in the battery system.

[0008] If there is no second abnormality at the welding joints of all cells and aluminum busbars in the battery system, then the first parameter of the battery system is obtained. The first parameter is used to measure whether the welding joints of the cells and aluminum busbars are qualified.

[0009] If the first parameter of the battery system is not within the preset range, it is determined that the battery system has a welding abnormality.

[0010] Optionally, the battery system includes at least one battery module, the battery module including a frame and a plurality of battery modules disposed within the frame, the battery modules including a plurality of battery cells and a plurality of aluminum busbars, the plurality of battery cells being connected in series and parallel through the plurality of aluminum busbars.

[0011] Optionally, it also includes:

[0012] If the battery cell and / or the aluminum busbar in the battery system has a first abnormality, then the battery system is determined to have a welding abnormality.

[0013] Optionally, the first anomaly includes cosmetic damage.

[0014] Optionally, it also includes:

[0015] If there is a second abnormality at the welding point between the battery cell and the aluminum busbar in the battery system, the battery system is determined to have a welding abnormality; wherein, the second abnormality is a poor weld or a missing weld.

[0016] The first parameter includes the insulation current corresponding to the aluminum busbar and the frame, and the range of the insulation current corresponding to the aluminum busbar and the frame is a preset range of insulation current;

[0017] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes,

[0018] If the insulation current corresponding to at least one of the aluminum busbars and the frame is not within the preset range of the insulation current, then the battery system is determined to have a welding abnormality.

[0019] Optionally, the first parameter also includes the AC internal resistance corresponding to the welding joint of the two terminals of the battery cell, and the range of the AC internal resistance corresponding to the welding joint of the two terminals of the battery cell is a preset range of AC internal resistance.

[0020] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes,

[0021] If the AC internal resistance corresponding to the welding joint of at least two terminals of at least one of the battery cells is not within the preset range of AC internal resistance, then the battery system is determined to have a welding abnormality.

[0022] Optionally, the first parameter further includes the temperature of the cell when it is used in the battery system, and the range of the temperature of the cell when it is used in the battery system is a preset range of cell temperature.

[0023] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes,

[0024] If the temperature of at least one of the battery cells is outside the preset temperature range of the battery cell when used in the battery system, then the battery system is determined to have a welding abnormality.

[0025] Optionally, the first parameter further includes the temperature of the aluminum busbar when it is used in the battery system, and the range of the temperature of the aluminum busbar when it is used in the battery system is a preset temperature range for the aluminum busbar.

[0026] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes,

[0027] If the temperature of at least one of the aluminum busbars is outside the preset temperature range of the aluminum busbars when used in the battery system, then the battery system is determined to have a welding abnormality.

[0028] On the other hand, embodiments of the present invention provide a battery system abnormal welding detection device, comprising:

[0029] The inspection module is used to inspect the welding joints of all cells and aluminum busbars in the battery system if no first abnormality is found in any of the cells and aluminum busbars in the battery system.

[0030] The acquisition module is used to acquire a first parameter of the battery system if there is no second abnormality at the welding joints of all cells and aluminum busbars in the battery system. The first parameter is used to measure whether the welding joints of the cells and aluminum busbars are qualified.

[0031] The first determination module is used to determine that the battery system has a welding abnormality if the first parameter of the battery system is not within the corresponding range.

[0032] This invention provides a method and apparatus for detecting abnormal welding in a battery system. The method includes the following steps: if none of the cells and aluminum busbars in the battery system exhibit a first abnormality, then the welds between all the cells and aluminum busbars in the battery system are inspected; if none of the welds between the cells and aluminum busbars in the battery system exhibit a second abnormality, then a first parameter of the battery system is obtained, which is used to measure whether the welds between the cells and aluminum busbars are qualified; if the first parameter of the battery system is not within a preset range, then it is determined that there is a welding abnormality in the battery system. Thus, when an abnormality occurs in the battery system during use, the welds between the cells and aluminum busbars can be quickly detected without damaging them. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1This invention provides a flowchart of a method for detecting abnormal welding in a battery system.

[0035] Figure 2 A schematic diagram of a battery cell and an aluminum busbar is provided for an embodiment of the invention.

[0036] Figure 3 for Figure 2 A schematic diagram of the battery cell;

[0037] Figure 4 This is a schematic diagram of a battery system abnormal welding detection device provided in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10-cell;

[0040] 101 - Square aluminum shell;

[0041] 102-Pole Column;

[0042] 20-Aluminum busbar;

[0043] 401 - Check module;

[0044] 402 - Get Module;

[0045] 403 - First Decision Module. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] In existing technologies, metallographic testing is required to inspect the weld between the battery cell and the aluminum busbar, which may damage the weld.

[0052] To address the aforementioned issues, this invention provides a method and apparatus for detecting abnormal welding in a battery system. If no first abnormality is found in any of the battery cells and aluminum busbars in the battery system, the welding points of all the battery cells and aluminum busbars in the battery system are inspected. If no second abnormality is found in any of the welding points of the battery cells and aluminum busbars in the battery system, a first parameter of the battery system is obtained. This first parameter is used to assess whether the welding points of the battery cells and aluminum busbars are qualified. If the first parameter of the battery system is outside a preset range, it is determined that there is a welding abnormality in the battery system. Therefore, when an abnormality occurs during battery system use, the welding points of the battery cells and aluminum busbars can be quickly detected without damaging them.

[0053] The following detailed description of the battery system abnormal welding detection method and apparatus provided by the present invention, with reference to specific embodiments, is provided in detail.

[0054] Figure 1 This invention provides a flowchart of a method for detecting abnormal welding in a battery system. Figure 2 A schematic diagram of the battery cell and aluminum busbar of a battery system is provided as an embodiment of the invention. Figure 2 Only one battery cell and two aluminum busbars are shown in the image; Figure 3 for Figure 2 A schematic diagram of the battery cell.

[0055] like Figures 1 to 3 As shown, this embodiment of the invention provides a method for detecting abnormal welding in a battery system, comprising the following steps:

[0056] S100. If none of the cells 10 and aluminum busbars 20 in the battery system have the first abnormality, then check the welds of all the cells 10 and aluminum busbars 20 in the battery system.

[0057] Specifically, the battery system includes at least one battery module, the battery module includes a frame and multiple battery modules disposed within the frame, the battery modules include multiple battery cells 10 and multiple aluminum busbars 20, the multiple battery cells 10 are used to be connected in series and parallel through the multiple aluminum busbars 20.

[0058] The battery cell 10 has a square aluminum shell 101 and a terminal post 102. The square aluminum shell 101 is covered with a blue film, which serves as insulation. The terminal post 102 is electrically connected to the aluminum busbar 20 by welding.

[0059] The first type of abnormality includes cosmetic damage. Cosmetic damage can include dents, bumps, or damage to the blue coating. It should be noted that the outer side of aluminum busbar 20 does not have a blue coating.

[0060] Inspect all the welded joints of the battery cells 10 and aluminum busbars 20 in the battery system, specifically, check whether there are any second abnormalities at the welded joints of all the battery cells 10 and aluminum busbars 20 in the battery system.

[0061] The second abnormality could be a cold solder joint or a missing solder joint. To check for the second abnormality at the solder joint between the battery cell 10 and the aluminum busbar 20, place an insulating metal sheet between the battery cell 10 and the aluminum busbar 20, and pry the aluminum busbar 20 with the insulating metal sheet. If the insulating metal sheet can pry the aluminum busbar 20, then there is a second abnormality at the solder joint between the battery cell 10 and the aluminum busbar 20. If the insulating metal sheet cannot pry the aluminum busbar 20, then there is no second abnormality at the solder joint between the battery cell 10 and the aluminum busbar 20.

[0062] Optionally, if the battery cell 10 and / or aluminum busbar 20 in the battery system have a first abnormality, it is determined that there is a welding abnormality in the battery system.

[0063] Specifically, when the first abnormality occurs in cell 10, it may be due to a dent, an impact, or damage to the blue film. When the first abnormality occurs in aluminum busbar 20, it may be due to a dent or an impact.

[0064] If the battery cell 10 in the battery system has a first abnormality, it is determined that the battery system has a welding abnormality; if the aluminum busbar 20 in the battery system has a first abnormality, it is determined that the battery system has a welding abnormality; if both the battery cell 10 and the aluminum busbar 20 in the battery system have a first abnormality, it is determined that the battery system has a welding abnormality.

[0065] Optionally, if a second abnormality is found at the weld between the battery cell 10 and the aluminum busbar 20 in the battery system, the battery system is determined to have a welding abnormality. Specifically, if at least one of the welds between all the battery cells 10 and the aluminum busbar 20 in the battery system has a second abnormality, the battery system is determined to have a welding abnormality.

[0066] S200. If there is no second abnormality at the welding joints of all cells 10 and aluminum busbars 20 in the battery system, then obtain the first parameter of the battery system.

[0067] The first parameter is used to measure whether the weld between the battery cell 10 and the aluminum busbar 20 is qualified. The first parameter is obtained without damaging the battery system, that is, without damaging the weld between the battery cell 10 and the aluminum busbar 20.

[0068] S300. Determine whether there is a welding abnormality in the battery system based on whether the first parameter of the battery system is within the corresponding range.

[0069] If the first parameter of the battery system is not within the corresponding range, it is determined that there is a welding abnormality in the battery system.

[0070] In this embodiment, there is a welding abnormality in the battery system, that is, there is a welding abnormality between the battery cell 10 and the aluminum busbar 20 in the battery system.

[0071] The battery system abnormal welding detection method provided in this embodiment of the invention can quickly detect the welding joint between the battery cell 10 and the aluminum busbar 20 without damaging the welding joint when an abnormality occurs during the use of the battery system.

[0072] Optionally, the first parameter includes the insulation current corresponding to the aluminum busbar 20 and the frame, and the range of the insulation current corresponding to the aluminum busbar 20 and the frame is a preset range of insulation current.

[0073] In the battery system, the square aluminum shell 101 of the cell 10 is covered with a blue film on the outside. The cell 10 is in contact with the frame, while the aluminum busbar 20 is not in contact with the frame.

[0074] The insulation current corresponding to the aluminum busbar 20 and the frame can be obtained using an insulation resistance meter. Specifically, one test probe of the insulation resistance meter is in contact with the aluminum busbar 20, and the other test probe is in contact with the frame to obtain the insulation current.

[0075] The preset insulation current range can be obtained by statistically analyzing the insulation current corresponding to all aluminum busbars 20 and the frame when the battery system is functioning normally. The preset insulation current range can be 0 to 1 mA.

[0076] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes: determining that the battery system has a welding abnormality if the insulation current corresponding to at least one aluminum busbar 20 and the frame is not within a preset insulation current range. Specifically, if the insulation current corresponding to at least one aluminum busbar 20 and the frame in the battery system is not within a preset insulation current range, then the battery system is determined to have a welding abnormality.

[0077] Optionally, the first parameter also includes the AC internal resistance corresponding to the welding joint of the two terminals 102 of the battery cell 10, and the range of the AC internal resistance corresponding to the welding joint of the two terminals 102 of the battery cell 10 is a preset range of AC internal resistance.

[0078] The AC internal resistance of the two terminals 102 of the battery cell 10 can be obtained by using an internal resistance tester. Specifically, one test probe of the internal resistance tester contacts the solder joint of one terminal 102, and the other test probe contacts the solder joint of the other terminal 102 to obtain the AC internal resistance.

[0079] The preset range of AC internal resistance can be obtained by statistically analyzing the corresponding AC internal resistance at the welding points of the two terminals 102 of all cells 10 when the battery system is in normal operation.

[0080] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes: if the AC internal resistance corresponding to the welding point of the two terminals 102 of at least one cell 10 is not within a preset range of AC internal resistance, then the battery system is determined to have a welding abnormality. Specifically, if the AC internal resistance corresponding to the welding point of the two terminals 102 of at least one cell 10 in the battery system is not within a preset range of AC internal resistance, then the battery system is determined to have a welding abnormality.

[0081] Optionally, the first parameter also includes the temperature of the cell 10 when it is used in the battery system, and the range of the temperature of the cell 10 when it is used in the battery system is a preset range of cell temperature.

[0082] The battery system includes a control and management unit, which can collect the temperature of each cell 10 in the battery system during battery system use.

[0083] The preset temperature range of the battery cells can be obtained by statistically analyzing the temperatures of all battery cells 10 during battery system operation when the battery system is in normal working order.

[0084] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within a preset range further includes: determining that the battery system has a welding abnormality if the temperature of at least one cell 10 is not within a preset cell temperature range during battery system use. Specifically, if the temperature of at least one cell 10 in the battery system is not within the preset cell temperature range during battery system use, then the battery system is determined to have a welding abnormality.

[0085] Optionally, the first parameter also includes the temperature of the aluminum busbar 20 when it is used in the battery system, and the range of the temperature of the aluminum busbar 20 when it is used in the battery system is a preset temperature range for the aluminum busbar.

[0086] The control and management unit can also collect the temperature of each aluminum busbar 20 in the battery system during battery system use.

[0087] The preset temperature range for aluminum busbars can be obtained by statistically analyzing the temperatures of all aluminum busbars 20 during battery system operation when the battery system is functioning normally.

[0088] The step of determining that the battery system has a welding abnormality if the first parameter of the battery system is not within the preset range further includes: determining that the battery system has a welding abnormality if the temperature of at least one aluminum busbar 20 is not within the preset range of aluminum busbar temperature during battery system use. Specifically, if the temperature of at least one aluminum busbar 20 in the battery system is not within the preset range of aluminum busbar temperature, then the battery system is determined to have a welding abnormality.

[0089] Optionally, the battery system abnormal welding detection method provided in this embodiment of the invention further includes: if the first parameter of the battery system is within the corresponding range, then the battery system is determined to be normal.

[0090] Specifically, if the insulation current of all aluminum busbars 20 in the battery system corresponding to the frame is within the preset insulation current range, the AC internal resistance corresponding to the welding joint of the two terminals 102 of all cells 10 is within the preset AC internal resistance range, the temperature of all cells 10 when used in the battery system is within the preset cell temperature range, and the temperature of all aluminum busbars 20 when used in the battery system is within the preset aluminum busbar temperature range, then the welding of the battery system is determined to be normal.

[0091] In this embodiment, the battery system welding is normal, that is, the battery cell 10 and the aluminum busbar 20 in the battery system are welded normally.

[0092] Figure 4 This is a schematic diagram of a battery system abnormal welding detection device provided in an embodiment of the present invention.

[0093] like Figure 4 As shown, this embodiment of the invention also provides a battery system abnormal welding detection device, including: an inspection module 401, an acquisition module 402, and a first determination module 403.

[0094] The inspection module 401 is used to inspect the welds between all the cells 10 and aluminum busbars 20 in the battery system if none of them exhibit the first abnormality. Since the implementation principle of the inspection module 401 is similar to that of step S100, further explanation is not provided here.

[0095] The acquisition module 402 is used to acquire the first parameter of the battery system if there is no second abnormality at the welding joints of all the cells 10 and aluminum busbars 20 in the battery system. The first parameter is used to measure whether the welding joints of the cells and aluminum busbars are qualified. Since the implementation principle of the acquisition module 402 is similar to that of step S200, it will not be described in more detail here.

[0096] The first determination module 403 is used to determine that there is a welding abnormality in the battery system if the first parameter of the battery system is not within the corresponding range. Since the implementation principle of the first determination module 403 is similar to that of step S300, it will not be described in detail here.

[0097] Optionally, the first determination module 403 is further configured to determine that the battery system has a welding abnormality if the insulation current corresponding to at least one aluminum busbar 20 and the frame is not within the preset insulation current range. Specifically, if the insulation current corresponding to at least one aluminum busbar 20 and the frame in the battery system is not within the preset insulation current range, then the battery system is determined to have a welding abnormality.

[0098] Optionally, the first determination module 403 is further configured to determine that there is a welding abnormality in the battery system if the AC internal resistance corresponding to the welding joint of the two terminals 102 of at least one cell 10 is not within the preset range of AC internal resistance. Specifically, if the AC internal resistance corresponding to the welding joint of the two terminals 102 of at least one cell 10 in the battery system is not within the preset range of AC internal resistance, then the battery system is determined to have a welding abnormality.

[0099] Optionally, the first determination module 403 is further configured to determine that there is a welding abnormality in the battery system if the temperature of at least one cell 10 is outside the preset cell temperature range during battery system operation. Specifically, if the temperature of at least one cell 10 in the battery system is outside the preset cell temperature range during battery system operation, then the battery system is determined to have a welding abnormality.

[0100] Optionally, the first determination module 403 is further configured to determine that there is a welding abnormality in the battery system if the temperature of at least one aluminum busbar 20 is outside the preset temperature range of the aluminum busbar during use in the battery system. Specifically, if the temperature of at least one aluminum busbar 20 in the battery system is outside the preset temperature range of the aluminum busbar, then the battery system is determined to have a welding abnormality.

[0101] Optionally, it also includes a second determination module, which determines that the battery system is normal if the first parameter of the battery system is within the corresponding range.

[0102] Optionally, it also includes a third determination module, used to determine that there is a welding abnormality in the battery system if there is a first abnormality in the battery cell 10 and / or aluminum busbar 20 in the battery system.

[0103] Optionally, it also includes a fourth determination module, which determines that there is a welding abnormality in the battery system if there is a second abnormality at the welding joint between the battery cell 10 and the aluminum busbar 20 in the battery system.

[0104] Embodiments of the present invention may also provide an electronic device, including a memory and a processor. The memory stores computer-executable instructions, and the processor is communicatively connected to the memory and can execute the computer-executable instructions stored in the memory to implement the battery system abnormal welding detection method mentioned above.

[0105] This invention also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the battery system abnormal welding detection method described in the above embodiments.

[0106] The integrated modules described above, implemented as software functional modules, can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods of the various embodiments of this application.

[0107] It should be understood that the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor. The memory may include high-speed RAM, and may also include non-volatile memory (NVM), such as at least one disk storage device, and may also be a USB flash drive, external hard drive, read-only memory, disk, or optical disc, etc.

[0108] The aforementioned storage medium can be implemented from any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium can be any available medium accessible to general-purpose or special-purpose computers.

[0109] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and storage medium can exist as discrete components in an electronic device or host device.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery system abnormal welding detection method characterized by, The method comprises the following steps: If all the battery cells and aluminum bars in the battery system have no first abnormality, check the welding of all the battery cells and aluminum bars in the battery system; If all the battery cells and aluminum bars in the battery system have no second abnormality, obtain a first parameter of the battery system, the first parameter being used to measure whether the welding of the battery cells and the aluminum bars is qualified; If the first parameter of the battery system is not within a corresponding range, it is determined that the battery system has welding abnormality. The battery system comprises at least one battery module, the battery module comprising a frame and a plurality of battery modules arranged in the frame, the battery module comprising a plurality of battery cells and a plurality of aluminum bars, the plurality of battery cells being used to be connected in series and parallel through the plurality of aluminum bars. The first parameter comprises an insulation current corresponding to the aluminum bar and the frame, and the corresponding range of the insulation current corresponding to the aluminum bar and the frame is a preset insulation current range. In the step of determining that the battery system has welding abnormality if the first parameter of the battery system is not within the preset range, the method further comprises: If the insulation current corresponding to at least one of the aluminum bars and the frame is not within the preset insulation current range, it is determined that the battery system has welding abnormality. The first parameter further comprises an alternating current internal resistance corresponding to the welding of the two pole columns of the battery cell, and the corresponding range of the alternating current internal resistance corresponding to the welding of the two pole columns of the battery cell is a preset alternating current internal resistance range. In the step of determining that the battery system has welding abnormality if the first parameter of the battery system is not within the preset range, the method further comprises: If the alternating current internal resistance corresponding to the welding of the two pole columns of at least one of the battery cells is not within the preset alternating current internal resistance range, it is determined that the battery system has welding abnormality. The first parameter further comprises a temperature of the battery cell when the battery system is used, and the corresponding range of the temperature of the battery cell when the battery system is used is a preset battery cell temperature range. In the step of determining that the battery system has welding abnormality if the first parameter of the battery system is not within the preset range, the method further comprises: If the temperature of at least one of the battery cells when the battery system is used is not within the preset battery cell temperature range, it is determined that the battery system has welding abnormality. The first parameter further comprises a temperature of the aluminum bar when the battery system is used, and the corresponding range of the temperature of the aluminum bar when the battery system is used is a preset aluminum bar temperature range. In the step of determining that the battery system has welding abnormality if the first parameter of the battery system is not within the preset range, the method further comprises: If the temperature of at least one of the aluminum bars when the battery system is used is not within the preset aluminum bar temperature range, it is determined that the battery system has welding abnormality.

2. The battery system abnormal weld detection method of claim 1, wherein The method further comprises: If the battery cells and / or the aluminum bars in the battery system have first abnormality, it is determined that the battery system has welding abnormality.

3. The battery system abnormal weld detection method of claim 2, wherein The first abnormality comprises appearance damage.

4. The battery system abnormal weld detection method of claim 1, wherein The method further comprises: If the welding of the battery cells and the aluminum bars in the battery system has second abnormality, it is determined that the battery system has welding abnormality; wherein the second abnormality is virtual welding or missing welding.

5. A battery system abnormal welding detection device characterized by comprising: The method comprises the following steps: checking whether all the battery cells and aluminum bars in the battery system are normal; if all the battery cells and aluminum bars in the battery system are normal, checking the welding position of all the battery cells and aluminum bars in the battery system; if all the battery cells and aluminum bars in the battery system are normal, obtaining the first parameter of the battery system, wherein the first parameter is used to measure whether the welding position of the battery cells and the aluminum bars is qualified; if the first parameter of the battery system is not in the corresponding range, determining that the battery system has welding abnormality; the battery system comprises at least one battery module, the battery module comprises a frame and a plurality of battery modules arranged in the frame, the battery module comprises a plurality of battery cells and a plurality of aluminum bars, and the plurality of battery cells are connected in series and parallel through the plurality of aluminum bars; the first parameter comprises the insulation current corresponding to the aluminum bar and the frame, and the corresponding range of the insulation current corresponding to the aluminum bar and the frame is the preset range of insulation current; if the first parameter of the battery system is not in the preset range, determining that the battery system has welding abnormality, and the method further comprises the following steps: if the insulation current corresponding to at least one aluminum bar and the frame is not in the preset range of insulation current, determining that the battery system has welding abnormality; the first parameter further comprises the alternating current internal resistance corresponding to the welding position of the two pole columns of the battery cell, and the corresponding range of the alternating current internal resistance corresponding to the welding position of the two pole columns of the battery cell is the preset range of alternating current internal resistance; if the first parameter of the battery system is not in the preset range, determining that the battery system has welding abnormality, and the method further comprises the following steps: if the alternating current internal resistance corresponding to the welding position of the two pole columns of at least one battery cell is not in the preset range of alternating current internal resistance, determining that the battery system has welding abnormality; the first parameter further comprises the temperature of the battery cell when the battery system is used, and the corresponding range of the temperature of the battery cell when the battery system is used is the preset range of battery cell temperature; if the first parameter of the battery system is not in the preset range, determining that the battery system has welding abnormality, and the method further comprises the following steps: if the temperature of at least one battery cell when the battery system is used is not in the preset range of battery cell temperature, determining that the battery system has welding abnormality; the first parameter further comprises the temperature of the aluminum bar when the battery system is used, and the corresponding range of the temperature of the aluminum bar when the battery system is used is the preset range of aluminum bar temperature; if the first parameter of the battery system is not in the preset range, determining that the battery system has welding abnormality, and the method further comprises the following steps: if the temperature of at least one aluminum bar when the battery system is used is not in the preset range of aluminum bar temperature, determining that the battery system has welding abnormality.

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