Verification tool and battery module assembly line

Abstract

The application discloses a kind of verification tool and battery module assembly line.The verification tool of the application includes battery module shell, multiple single batteries and multiple connecting pieces, single battery is arranged in battery module shell, each single battery is sequentially arranged along the width direction;Each connecting piece is welded with the pole of single battery;Verification tool further includes verification point and identification point, identification point is configured as: when detection equipment detects identification point, detection equipment can be triggered to determine that the current detection object is verification tool;Verification point is configured as: when detection equipment detects verification point, detection equipment can be triggered to determine that verification point is one of NG state or OK state, and at least one verification point of verification tool can trigger detection equipment to determine that it is NG state.The feedback function of the verification tool of the application can be used to verify whether the detection equipment is normal, and the fault of detection equipment is found in time.

Description

Technical Field

[0001] This invention relates to the field of equipment calibration, and more particularly to a calibration fixture and a battery module assembly line. Background Technology

[0002] The assembly of battery modules involves multiple inspection processes. Inspection equipment checks parameters such as dimensions of the battery modules. When the equipment detects out-of-tolerance dimensions or defects, it classifies the battery module as defective and issues an alarm to alert the operator. Inspection equipment is a crucial factor in controlling battery module quality; therefore, it needs frequent calibration to prevent malfunctions.

[0003] In existing technologies, the calibration of testing equipment is achieved by measuring standard parts. If the difference between the testing equipment's result and the standard value of the standard part exceeds a set value, the testing equipment is deemed to require repair. Sometimes, testing equipment may produce accurate results and detect out-of-tolerance dimensions or defects, but the equipment's display may not show defect information or it may not alarm, indicating a malfunction in its feedback function. This prevents defective products from being promptly removed. Such faults cannot be detected by measuring standard parts and are often difficult to identify, potentially leading to defective products flowing into the next process and causing batch quality problems. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a calibration fixture, which can be used to verify whether the feedback function of the equipment is normal, and to detect faults in the testing equipment in a timely manner.

[0005] The present invention also proposes a battery module assembly line having the above-mentioned verification fixture.

[0006] According to a first aspect of the present invention, a verification fixture includes:

[0007] Battery module casing;

[0008] Multiple individual battery cells are disposed within the housing of the battery module, and the individual battery cells are arranged sequentially along the width direction;

[0009] Multiple connecting pieces, each of which is welded to the terminal of the single battery cell;

[0010] The verification fixture further includes a verification point and an identification point. The identification point is configured such that when the detection device detects the identification point, it can trigger the detection device to determine that the current detection object is the verification fixture. The verification point is configured such that when the detection device detects the verification point, it can trigger the detection device to determine that the verification point is in either an NG state or an OK state. The verification fixture has at least one verification point that can trigger the detection device to determine that it is in an NG state.

[0011] The calibration fixture according to embodiments of the present invention has at least the following beneficial effects: The calibration fixture of this application can be used to verify whether the feedback function of the equipment is normal, and to promptly detect faults in the testing equipment, reducing the probability of defective products flowing into downstream processes. On the other hand, the components of the calibration fixture of this application are basically consistent with those of a normal battery module, making it easy to manufacture and produce. By deliberately creating defective calibration points to test the testing equipment, the accuracy of the calibration can be improved, avoiding interference from other dimensional and appearance factors. Furthermore, by setting different calibration points, the calibration fixture can integrate the calibration of different detection elements, reducing the number of calibration fixtures for each detection element and lowering the cost of manual maintenance of the fixtures.

[0012] According to some embodiments of the present invention, the single cell defines a cavity.

[0013] According to some embodiments of the present invention, the identification point is any one or a combination of the following schemes:

[0014] The identification point is a protrusion or a groove;

[0015] The identification points are color-coded.

[0016] The identification point is a barcode or a QR code.

[0017] According to some embodiments of the present invention, when the identification point is a barcode or a QR code, the barcode or the QR code contains the following preset information: the specified verification point is in an NG state, and the remaining verification points are in an OK state.

[0018] According to some embodiments of the present invention, the verification point includes a first verification point, the battery module housing includes a plurality of support legs, each of the support legs protruding from the bottom surface of the battery module housing, the height of the support leg protruding from the bottom surface is the first verification point, the number of the first verification points is plurality, the theoretical maximum value of the first verification point is set to A1, the theoretical minimum value is set to A2, and the first verification point is configured as any one or more combinations of the following schemes:

[0019] At least one of the first verification points has an actual size greater than A1;

[0020] At least one of the first verification points has an actual size smaller than A2;

[0021] The actual size of at least one of the first verification points is less than or equal to A1 and greater than or equal to A2.

[0022] According to some embodiments of the present invention, the verification point further includes a second verification point, wherein each of the connecting pieces is welded to the terminal post of the single cell, and the second verification point is formed at each welding point, and the second verification point is configured as any one or a combination of the following schemes:

[0023] At least one of the second verification points is a blast hole;

[0024] At least one of the second verification points is a missing solder joint;

[0025] At least one of the second verification points is a cold solder joint;

[0026] At least one of the second verification points meets the appearance requirements of the weld.

[0027] According to some embodiments of the present invention, a plurality of second verification points meet the appearance requirements of the weld, the verification points further include a third verification point, the weld width at the weld joint forms the third verification point, the theoretical maximum value of the third verification point is A3, the theoretical minimum value is A4, and the third verification point is configured as any one or a combination of the following schemes:

[0028] At least one of the third verification points has a size greater than A3;

[0029] At least one of the third verification points has a size smaller than A4;

[0030] The size of at least one of the third verification points is less than or equal to A3 and greater than or equal to A4.

[0031] According to some embodiments of the present invention, the verification point includes a fourth verification point. The battery module housing includes two end plates and two side plates, each end plate and each side plate surrounding the single battery cell. The two ends of each end plate are respectively welded to different side plates. The distance between two oppositely arranged side plates forms the fourth verification point. The theoretical maximum size of the fourth verification point is set to A5, and the theoretical minimum size is set to A6. The fourth verification point is configured as any one or a combination of the following schemes:

[0032] The actual size of the fourth verification point is greater than A5;

[0033] The actual size of the fourth verification point is less than A6;

[0034] The actual size of the fourth verification point is less than or equal to A5 and greater than or equal to A6.

[0035] According to some embodiments of the present invention, the verification point further includes a fifth verification point, wherein the difference between the bottom surface of each individual battery cell and the set plane is the fifth verification point, the theoretical maximum value of the fifth verification point is set to A7, and the fifth verification point is configured such that the actual value of the fifth verification point is greater than A7.

[0036] According to some embodiments of the present invention, the verification point further includes a sixth verification point, wherein at least two adjacent individual cells are electrically connected to form the sixth verification point.

[0037] According to some embodiments of the present invention, the single cell is not covered with an insulating film, or the single cell is covered with an insulating film, but the insulating film is damaged.

[0038] A battery module assembly line according to a second aspect of the present invention includes:

[0039] Testing equipment;

[0040] The verification fixture as described in any of the above embodiments;

[0041] A transport device, used to transport the calibration fixture to the testing device;

[0042] The detection device includes a detection component, a sensing component, and a control component. The detection component measures the verification point and outputs a detection result. The sensing component identifies the identification point and outputs preset information. The control component compares the detection result with the preset information. The detection device is configured such that: if the detection result and the preset information match, the detection device continues to detect the next object to be detected; if the detection result and the preset information do not match, the detection device pauses detection.

[0043] The battery module assembly line according to the present invention has at least the following beneficial effects: by calling preset information through identification points and adding the comparison between the detection results of the verification points and the preset information, the verification tooling can pass normally under the premise that the equipment feedback function and the detection function are normal, thereby reducing the impact of verification behavior on production efficiency.

[0044] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0046] Figure 1This is a schematic diagram of the structure of the verification fixture according to an embodiment of the present invention;

[0047] Figure 2 This is an exploded view of the verification fixture according to an embodiment of the present invention.

[0048] Figure label:

[0049] Battery module housing 100; end plate 110; support foot 111; side plate 120; single cell 200; connecting piece 300; identification point 400; first verification point 510; second verification point 520; fourth verification point 530. Detailed Implementation

[0050] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0052] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0053] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0054] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "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 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.

[0055] In the mass production of battery modules, automated testing equipment is often used to inspect various dimensional, appearance, and electrical performance parameters of the battery modules. It should be explained that the testing equipment includes both detection and feedback functions. The detection function is used to measure the actual values ​​of each parameter, while the feedback function is used to coordinate with operators or other equipment. If the feedback function of the testing equipment malfunctions, even if the testing equipment detects defects, it will not be able to provide feedback signals such as displaying defect information, alarms, or stopping the testing equipment. As a result, operators will not be able to know in time that the object being tested has a defect, which often leads to defective products flowing into subsequent processes.

[0056] Therefore, an embodiment of the first aspect of this application proposes a verification fixture for verifying whether the testing equipment can correctly identify defective products and provide feedback information.

[0057] Specifically, such as Figure 1 and Figure 2 As shown, the calibration fixture includes a battery module housing 100, multiple individual battery cells 200, and multiple connecting pieces 300. Each individual battery cell 200 is disposed within the battery module housing 100, and the individual battery cells 200 are arranged sequentially along the width direction. It should be noted that the battery module housing 100 can be configured as follows: Figure 2 The diagram shows end plates 110 and side plates 120, which surround the individual battery cell 200. The two ends of each individual battery cell 200 abut against the battery module housing 100 along its length. Alternatively, the battery module housing 100 may contain multiple groups of individual batteries 200 arranged sequentially along the length of each individual battery cell 200, with the end plates 110 and side plates 120 surrounding these groups. Alternatively, the battery module housing 100 may only have end plates 110, with the end plates 110 on both sides abutting against the large surfaces of the individual batteries 200 at both ends. A connecting piece 300 is disposed on the top surface of the individual battery cell 200 and welded to the terminal post of the individual battery cell 200. Figure 1 and Figure 2 As shown, the connecting piece 300 is used to connect the terminals of adjacent individual cells 200 to connect the individual cells 200 together in series.

[0058] The calibration fixture also includes calibration points and identification points 400. It should be noted that, apart from the calibration points and identification points 400, the other components of this calibration fixture are essentially the same as those of a normal battery module. In the battery module assembly line, after assembly, the components are transported to the testing equipment for inspection to check whether their assembly dimensions, processing dimensions, or component appearance meet the requirements, thereby controlling assembly quality. This calibration fixture can be processed along with normal battery modules and mixed in with them for inspection to verify the functionality of the testing equipment.

[0059] Specifically, when the calibration fixture is transferred to the testing equipment for testing, the identification point 400 of the calibration fixture can be detected by the testing equipment, thereby triggering the testing equipment to determine that the current testing object is the calibration fixture, distinguishing it from the normal battery module. On the other hand, since the shape of the calibration fixture is basically the same as that of the normal battery module, the existence of the identification point 400 helps operators or automated equipment to identify the component as the calibration fixture, thus preventing the calibration fixture from being mixed into the normal battery module and flowing into subsequent processes.

[0060] In addition, the verification points on the calibration fixture can also be identified by the testing equipment. These verification points can trigger the testing equipment to determine whether the verification point is in an NG (Not Good) or OK state. The calibration fixture includes combinations of multiple types of verification points, including verification points for appearance elements such as welding quality inspection and insulation film damage inspection, as well as verification points for dimensional elements such as the height of the battery module's support legs 111 and the bottom flatness inspection of each individual battery cell 200. The number and location of the verification points can be determined based on the dimensional or appearance elements that need to be inspected for a normal battery module.

[0061] Specifically, the verification points include a first verification point 510 for detecting the height of the battery module's support legs 111, a second verification point 520 for detecting the welding quality and internal resistance of the connecting piece 300, a third verification point for detecting the weld width, a fourth verification point 530 for detecting the spacing of the side plates 120, a fifth verification point for detecting the flatness of the bottom surface of the battery module, and a sixth verification point for performing skin breakage detection and insulation withstand voltage detection. It is understood that the verification fixture of this application is not limited to these six verification points.

[0062] Taking the first verification point 510 as an example, when the verification fixture enters the testing equipment, the testing equipment is programmed to test the height of the battery module's support leg 111 and stores the acceptable range for the height of the support leg 111. The measuring component of the testing equipment measures the height of the support leg 111 and sends a measurement value back to the control component of the testing equipment. The control component compares the theoretical value with the measured value. If the measured value falls within the acceptable range, the verification point is determined to be OK, and the testing equipment continues to test the next object to be tested. If the measured value falls outside the acceptable range, a normally functioning testing equipment will determine the verification point to be NG and will display warning information on the display, sound an alarm, and stop the equipment to remind the operator that the current object to be tested is a defective product, so that it can be removed in time. However, if a faulty testing equipment determines the verification point to be NG, it will not provide feedback and will continue to operate normally and test the next object to be tested, causing defective products to flow into the next process.

[0063] Therefore, in this application, the calibration fixture has at least one calibration point that can trigger the testing equipment to determine that it is in an NG state. That is, the calibration fixture has at least one defect that does not meet the theoretical requirements, and this defect can be detected by the testing equipment. Thus, the operator can determine whether the feedback function of the current testing equipment is normal by observing the reaction of the testing equipment when it detects the calibration fixture. For example, if the height of one of the legs 111 of the first calibration point 510 is manually set to be less than the theoretical minimum value, when the calibration fixture is transmitted to the testing equipment, the identification point 400 is identified by the testing equipment, and the display shows that the current testing object is the calibration fixture, then the operator should pay attention to whether the testing equipment will give feedback. If the testing equipment detects that the first calibration point 510 is in an NG state and gives a warning message or stops the equipment to remind the operator, it means that the feedback function of the testing equipment is normal; otherwise, the equipment is faulty.

[0064] Based on the above, the calibration fixture of this application can be used to verify whether the feedback function of the equipment is normal, and to detect faults in the testing equipment in a timely manner, reducing the probability of defective products flowing into downstream processes. On the other hand, the components of the calibration fixture of this application are basically the same as those of normal battery modules, making them easy to manufacture and produce. By testing the testing equipment through deliberately created defective calibration points, the accuracy of calibration can be improved, avoiding interference from other dimensional and appearance factors. Furthermore, by setting different calibration points, this calibration fixture can integrate the calibration of different detection elements, reducing the number of calibration fixtures for each detection element and lowering the cost of manual maintenance of the fixtures.

[0065] Furthermore, after the testing equipment determines that the current object to be tested is a calibration fixture through the identification point 400, the testing equipment has preset status information of each calibration point of the calibration fixture, or the identification point 400 has preset status information of each calibration point that can be acquired by the testing equipment. Then, the testing equipment compares the test result (calibration point status: OK or NG) with the preset information. If the comparison is consistent (i.e., the test result is OK and the preset information also indicates the calibration point is OK, or the test result is NG and the preset information also indicates the calibration point is NG), the testing equipment continues to test the next object to be tested. If the comparison is inconsistent (i.e., the test result is OK and the preset information indicates the calibration point is NG, or the test result is NG and the preset information indicates the calibration point is OK), it indicates a malfunction in the testing equipment's function, and the control component stops the equipment for maintenance.

[0066] Taking the specific testing process of a testing device with normal feedback and detection functions as an example: When the calibration fixture enters the testing device, the identification point 400 is recognized by the testing device, and the testing device obtains preset information, including that the object to be tested is the calibration fixture and that it has a defect at a specific calibration point. The testing device displays on the screen that the object to be tested is the calibration fixture, and also provides feedback on the defect information of the object to be tested to the operator. After seeing the defect information, the operator can determine that the feedback function of the testing device is normal. At the same time, the testing device compares the test result with the preset information. If the comparison is consistent, the testing device moves the calibration fixture out of the testing position, and the testing device continues to the next testing action. The operator can then remove the calibration fixture from the production line.

[0067] Therefore, this calibration fixture can not only verify whether the feedback function of the detection equipment is normal, but also further verify whether the detection function of the detection equipment is normal. Furthermore, if the detection equipment detects a defect at the calibration point and alarms and stops, production line production would be interrupted every time the calibration fixture passes through the detection equipment. By calling preset information at identification point 400 and adding a comparison between the detection result of the calibration point and the preset information, the calibration fixture can pass normally under the premise that the equipment feedback function and detection function are normal, thus reducing the impact of calibration on production efficiency.

[0068] like Figure 1 and Figure 2As shown, a normal battery module includes multiple individual cells 200. The individual cells 200 are used for welding to the connecting piece 300 and for supporting the battery module casing 100. Each individual cell 200 contains an electrolyte and a battery cell to generate an electrochemical reaction for energy storage or power supply. In some embodiments of this application, to reduce the weight of the overall calibration fixture and facilitate its handling, the individual cells 200 are defined as empty cavities; that is, the individual cells 200 do not contain electrolyte or battery cells. Furthermore, since the empty individual cells 200 are not charged, it is safer during the assembly, handling, and testing of the calibration fixture.

[0069] In some embodiments, the identification point 400 is a combination of one or more of the following schemes:

[0070] Option 1: The identification point 400 is a protrusion or a groove, that is, the identification point 400 has a specific shape. For example, a protruding cylinder is provided on the battery module shell 100 of the calibration fixture. The shell of a normal battery module does not have this protruding cylinder. The testing equipment can identify the protruding cylinder by taking a picture with a CCD camera, and the operator can also identify the calibration fixture with the naked eye.

[0071] Option 2: Identification point 400 is a color mark. For example, a red circle mark is painted on the battery module shell 100 of the calibration fixture. The testing equipment can identify the red circle mark through a CCD camera or a color recognition sensor, and the operator can also identify it with the naked eye.

[0072] Option 3: As Figure 1 and Figure 2 As shown, identification point 400 is a barcode or QR code, which contains pre-set information about the verification fixture. Scanning the barcode or QR code allows access to this pre-set information. In some embodiments, to trace and monitor the production progress of the battery module, a traceability code is provided on the battery module's casing. This traceability code can also be used as identification point 400; scanning the traceability code allows differentiation between normal battery modules and verification fixtures.

[0073] For Schemes 1 and 2 above, the status information of each verification point of the verification fixture can be preset inside the testing equipment. For example, the verification fixture with the raised cylinder can be set as verification fixture No. 1, and the verification fixture with the round hole can be set as verification fixture No. 2, etc. When the testing fixture detects the raised cylinder, it retrieves the data of verification fixture No. 1 from the memory to obtain the status information of each verification point of that verification fixture. Scheme 2 is similar.

[0074] For the third scheme described above, information can be preset within the barcode or QR code, allowing the detection device to obtain this preset information after scanning. The preset information could be: a specified verification point is in an NG (Not Acceptable) state, while the remaining verification points are in an OK state. Taking a verification fixture with a first verification point 510, a second verification point 520, and a third verification point as an example, the preset information could be: the first verification point 510 is in an NG state, while the second and third verification points are in an OK state. This facilitates comparison with the detection results in subsequent steps.

[0075] In some embodiments, the verification point includes a first verification point 510. The battery module housing 100 includes a plurality of supports 111, each support 111 protruding from the bottom surface of the battery module housing 100. The height of the support 111 protruding from the bottom surface of the battery module housing 100 is the first verification point 510. Since there are multiple supports 111, there are also multiple first verification points 510. The theoretical maximum value of the first verification point 510 is set to A1, and the theoretical minimum value is set to A2, that is, the theoretical height of the support 111 should be A1-A2. The first verification point 510 is configured as any one or a combination of the following schemes:

[0076] Option 1: The actual size of at least one first verification point 510 is greater than A1, that is, the size of the first verification point 510 is unqualified;

[0077] Option 2: The actual size of at least one first verification point 510 is smaller than A2, that is, the size of the first verification point 510 is unqualified;

[0078] Option 3: The actual size of at least one first verification point 510 is less than or equal to A1 and greater than or equal to A2, that is, the size of the first verification point 510 is qualified.

[0079] like Figure 2As shown, each side of the end plate 110 has a support leg 111 at its bottom, resulting in a total of four support legs 111 for the entire calibration fixture, forming four first calibration points 510. After the side plate 120 is fastened to the end plate 110, the end plate 110 is pressed down by a cylinder to adjust the height of the support legs 111. During the adjustment process, shims are placed at the support legs 111 to adjust their height. Thus, the actual dimensions of two support legs 111 on the same end plate 110 can be adjusted to be greater than A1 or less than A2, intentionally making their dimensions unqualified. The actual dimensions of two support legs 111 on the other end plate 110 can be adjusted to be less than or equal to A1 and greater than or equal to A2, making their dimensions qualified. Therefore, when the testing equipment detects the first calibration points 510 on the calibration fixture, it should determine that two first calibration points 510 are in an NG state and two first calibration points 510 are in an OK state. The preset information contained in the traceability code on the calibration fixture should also be set to the corresponding two first calibration points 510 as NG, and the other two first calibration points 510 as OK. The setting of the first calibration point 510 verifies whether the testing equipment can correctly detect the height dimension of the support leg 111, and verifies whether the testing equipment can provide normal feedback for defects in the height dimension of this leg.

[0080] In some embodiments, the verification point further includes a second verification point 520, wherein each connecting piece 300 is welded to the terminal post of the single cell 200, and a second verification point 520 is formed at each welding point; that is, there are multiple second verification points 520. The second verification point 520 is configured as any one or a combination of the following schemes:

[0081] Option 1: At least one second verification point 520 is a blown hole;

[0082] Option 2: At least one second checkpoint 520 is a missing solder joint;

[0083] Option 3: At least one second checkpoint 520 is a cold solder joint;

[0084] Option 4: At least one second check point 520 meets the appearance requirements of the weld.

[0085] It should be noted that pores, incomplete welds, and incomplete welds are all welding defects known to those skilled in the art, such as... Figure 1In the illustrated embodiment, during the welding of the connecting piece 300 to the terminal of the single cell 200, there are multiple welding positions. One welding position is coated with a small amount of organic material to cause a weld hole; another welding position is selected where heat input is reduced by lowering the welding power, resulting in a partial weld of the connecting piece 300 to the terminal; and another welding position is intentionally left unwelded through manual intervention. The remaining positions are welded normally, meeting the appearance requirements of welding, i.e., no weld holes, incomplete welds, or partial welds appear. Therefore, when the testing equipment detects the second verification point 520, three of the second verification points 520 are in an NG state, while the remaining second verification points 520 are in an OK state. The setting of the second verification point 520 verifies whether the testing equipment can correctly identify welding defects such as weld holes, incomplete welds, and partial welds, and verifies whether the testing equipment can provide normal feedback for these welding defects. Furthermore, if there are partial welds or incomplete welds at the second verification point 520, it will also cause an anomaly in the internal resistance detection of the verification fixture, thus serving as a verification function for the internal resistance detection of the testing equipment.

[0086] Furthermore, the verification point also includes a third verification point. For the second verification point 520 in the above embodiment that meets the appearance requirements of the weld, the weld width is measured. The weld width at the weld joint forms the third verification point. The theoretical maximum value of the third verification point is A3, and the theoretical minimum value is A4. The third verification point is configured as any one or a combination of the following schemes:

[0087] Option 1: The size of at least one third verification point is greater than A3, indicating that the weld width is too large;

[0088] Option 2: The size of at least one third verification point is smaller than A4, indicating that the weld width is too small;

[0089] Option 3: If the size of at least one third verification point is less than or equal to A3 and greater than or equal to A4, the weld width is qualified.

[0090] In some embodiments, the verification point further includes a fourth verification point 530. The battery module housing 100 includes two end plates 110 and two side plates 120. Each end plate 110 and each side plate 120 is disposed around the single cell 200. The two ends of the end plate 110 are respectively welded to different side plates 120. The distance between the two oppositely disposed side plates 120 forms the fourth verification point 530. The theoretical maximum size of the fourth verification point 530 is set to A5, and the theoretical minimum size is set to A6. The fourth verification point 530 is configured as any one or a combination of the following schemes:

[0091] Option 1: The actual size of the fourth verification point 530 is larger than A5, and the spacing is too large;

[0092] Option 2: The actual size of the fourth verification point 530 is smaller than A6, and the spacing is too small;

[0093] Option 3: The actual size of the fourth checkpoint 530 is less than or equal to A5 and greater than or equal to A6, so the spacing is acceptable.

[0094] The setting of the fourth verification point 530 verifies whether the testing equipment can correctly measure the 120mm spacing of the side plates and whether it can provide normal feedback on defects in this 120mm spacing. Similarly, verification points can be set for dimensional elements such as the length and height of the verification fixture to verify the accuracy of the testing equipment's detection.

[0095] In some embodiments, the verification point further includes a fifth verification point. The difference in distance between the bottom surface of each individual battery cell 200 and a set plane is the fifth verification point. The theoretical maximum value of the fifth verification point is set to A7. The fifth verification point is configured such that if the actual value of the fifth verification point is greater than A7, that is, the flatness of the bottom surface of the individual battery cell 200 is unqualified. The setting of the fifth verification point verifies whether the testing equipment can correctly measure the flatness of the bottom surface of the battery module and verifies whether the testing equipment can provide normal feedback for the flatness defect.

[0096] In some embodiments, the verification point further includes a sixth verification point, where at least two adjacent individual cells 200 are conductive to form the sixth verification point. Therefore, during the insulation withstand voltage test of the verification fixture, it will be detected as a defect by the testing equipment, and the sixth verification point will be determined to be in an NG state. Specifically, in a normal battery module, the outer surface of the individual cells 200 is covered with an insulating film to prevent the casing of the individual cells 200 from conducting electricity and causing a short circuit. In the embodiments of this application, the individual cells 200 of the verification fixture are not covered with an insulating film, or the individual cells 200 are covered with an insulating film, but the insulating film is damaged. Consequently, at least two adjacent individual cells 200 are conductive. During the damage detection of the verification fixture, the absence of an insulating film or the damage to the insulating film will be detected as a defect by the testing equipment.

[0097] The second aspect of this application provides a battery module assembly line, including a testing device, a transport device, and a verification fixture as described in any of the above embodiments. The verification fixture can be placed on the transport device and circulates with normal battery modules. The transport device transmits the normal battery modules and the verification fixture to the testing device, and measures the testing elements sequentially. The testing device is equipped with a testing component, a sensing component, and a control component. The testing component can measure the actual value of the verification point and output the status information of the verification point to the control component. The sensing component can obtain the preset information in the verification fixture by scanning the traceability code with a scanner, or by calling the preset verification fixture library after sensing the identification point 400 with a CCD camera to obtain the preset information of the corresponding verification fixture. The control component can compare whether the test result and the status information of the verification point in the preset information are consistent. For a specific verification point, if the test result determines that it is in an NG state, and the preset information pre-sets it to be in an NG state, it means that the testing device is operating normally, and the testing device continues to test the next object to be tested. If the preset information pre-sets it to be in an OK state, it means that the testing device has a fault and needs to be stopped for maintenance. The control component controls the testing device to suspend testing.

[0098] Based on the above, if the testing equipment detects a defect at the verification point and alarms and stops, the battery module assembly line will be interrupted every time the verification fixture passes through the testing equipment. By calling the preset information through the identification point 400 and comparing the detection result of the verification point with the preset information, the verification fixture can pass through normally under the premise that the equipment feedback function and the detection function are normal, thus reducing the impact of the verification behavior on production efficiency.

[0099] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

Claims

1. A calibration fixture for calibrating testing equipment, characterized in that, include: Battery module casing; Multiple individual batteries are disposed inside the battery module housing, and the individual batteries are arranged sequentially along the width direction; Multiple connecting pieces, each of which is welded to the terminal of the single battery cell; The verification fixture further includes a verification point and an identification point. The identification point is configured such that when the detection device detects the identification point, it can trigger the detection device to determine that the current detection object is the verification fixture. The verification point is configured such that when the detection device detects the verification point, it can trigger the detection device to determine that the verification point is in either an NG state or an OK state. The verification fixture has at least one verification point that can trigger the detection device to determine that it is in an NG state.

2. The calibration fixture according to claim 1, characterized in that, The individual battery cell defines a cavity.

3. The calibration fixture according to claim 1, characterized in that, The identification point is any one or a combination of the following schemes: The identification point is a protrusion or a groove; The identification points are color-coded. The identification point is a barcode or a QR code.

4. The calibration fixture according to claim 3, characterized in that, When the identification point is a barcode or a QR code, the barcode or QR code contains the following preset information: the specified verification point is in an NG state, and the remaining verification points are in an OK state.

5. The calibration fixture according to claim 1, characterized in that, The verification point includes a first verification point. The battery module housing includes multiple support legs, each of which protrudes from the bottom surface of the battery module housing. The height of the support leg protruding from the bottom surface is the first verification point. There are multiple first verification points. The theoretical maximum value of the first verification point is set to A1, and the theoretical minimum value is set to A2. The first verification point is configured as any one or more combinations of the following schemes: At least one of the first verification points has an actual size greater than A1; At least one of the first verification points has an actual size smaller than A2; The actual size of at least one of the first verification points is less than or equal to A1 and greater than or equal to A2.

6. The calibration fixture according to claim 1, characterized in that, The verification point further includes a second verification point, wherein each of the connecting pieces is welded to the terminal post of the single battery cell, and the second verification point is formed at each welding point. The second verification point is configured as any one or a combination of the following schemes: At least one of the second verification points is a blast hole; At least one of the second verification points is a missing solder joint; At least one of the second verification points is a cold solder joint; At least one of the second verification points meets the appearance requirements of the weld.

7. The calibration fixture according to claim 6, characterized in that, The weld has multiple second verification points that meet the appearance requirements of the weld. The verification points also include a third verification point, formed by the weld width at the weld joint. The theoretical maximum value of the third verification point is A3, and the theoretical minimum value is A4. The third verification point is configured as any one or a combination of the following schemes: At least one of the third verification points has a size greater than A3; At least one of the third verification points has a size smaller than A4; The size of at least one of the third verification points is less than or equal to A3 and greater than or equal to A4.

8. The calibration fixture according to claim 1, characterized in that, The verification point includes a fourth verification point. The battery module housing includes two end plates and two side plates, each end plate and each side plate surrounding the single battery cell. The two ends of each end plate are welded to different side plates. The distance between two oppositely arranged side plates forms the fourth verification point. The theoretical maximum size of the fourth verification point is set to A5, and the theoretical minimum size is set to A6. The fourth verification point is configured as any one or a combination of the following schemes: The actual size of the fourth verification point is greater than A5; The actual size of the fourth verification point is less than A6; The actual size of the fourth verification point is less than or equal to A5 and greater than or equal to A6.

9. The calibration fixture according to claim 1, characterized in that, The verification point also includes a fifth verification point. The difference between the bottom surface of each individual battery cell and the set plane is the fifth verification point. The theoretical maximum value of the fifth verification point is set to A7. The fifth verification point is configured such that the actual value of the fifth verification point is greater than A7.

10. The calibration fixture according to claim 1, characterized in that, The verification point also includes a sixth verification point, wherein at least two adjacent individual cells are electrically connected to form the sixth verification point.

11. The calibration fixture according to claim 10, characterized in that, The individual battery cell is not covered with an insulating film, or the individual battery cell is covered with an insulating film, but the insulating film is damaged.

12. A battery module assembly line, characterized in that, include: Testing equipment; The calibration fixture as described in any one of claims 1 to 11; A transport device, used to transport the calibration fixture to the testing device; The detection device includes a detection component, a sensing component, and a control component. The detection component can measure the verification point and output the detection result. The sensing component can identify the identification point and output preset information. The control component can compare the detection result with the preset information. The detection device is configured such that: if the detection result matches the preset information, the detection device continues to detect the next object to be detected; if the detection result does not match the preset information, the detection device suspends detection.

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