Pole lug detection positioning tool and detection system

Abstract

The embodiment of the utility model provides a tab detection positioning tool and a detection system. The tab detecting and positioning tool is used for being matched with a resistance meter, the resistance meter is provided with a first detecting meter pen and a second detecting meter pen, the tab detecting and positioning tool comprises a supporting table, a first mounting seat and a pressing plate, the supporting table is provided with a bearing surface, and the bearing surface is used for bearing a battery monomer to be detected; the first mounting seat is arranged on one side, deviating from the bearing surface, of the supporting table, the first mounting seat is used for mounting a first detection meter pen, and a probe end of the first detection meter pen is used for abutting against an electrode terminal on a top cover of the single battery; the pressing plate is arranged on the supporting table, at least part of the pressing plate presses the welding and printing area of the tab on the top cover, the pressing plate is provided with a plurality of detection holes allowing the probe end of the second detection meter pen to penetrate through, and the multiple detection holes are formed around the edge of the welding and printing area of the tab at intervals. According to the technical scheme provided by the invention, the detection efficiency of the welding quality of the tabs can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a tab detection and positioning fixture and detection system. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of stability and reliability in use.

[0003] Among internal defects in batteries, tab defects are one of the important causes of battery failure. Due to the influence of welding process, welding environment and welding material properties, cracking of the weld edge of the tab is inevitable. For laser weld inspection without adapter plates, there is a problem of low tab detection efficiency. Utility Model Content

[0004] This application provides a tab detection and positioning fixture and detection system, which can improve the detection efficiency of the welding quality of the tab.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a tab detection and positioning fixture for use with a resistance meter. The resistance meter has a first test probe and a second test probe. The tab detection and positioning fixture includes a support platform, a first mounting base, and a pressure plate. The support platform has a bearing surface for bearing the battery cell to be tested. The first mounting base is disposed on the side of the support platform away from the bearing surface and is used for mounting the first test probe. The probe end of the first test probe is used to abut against the electrode terminal on the top cover of the battery cell. The pressure plate is disposed on the support platform, and at least a portion of the pressure plate presses against the solder area of ​​the tab on the top cover. The pressure plate has multiple detection holes for the probe end of the second test probe to pass through. The multiple detection holes are spaced apart around the edge of the solder area of ​​the tab.

[0007] In the technical solution of this application embodiment, the support platform can support the battery cell to be tested. The battery cell to be tested is placed on the support platform, and the first mounting base is installed on the side of the support platform away from the bearing surface. The first test probe of the resistance meter is installed on the first mounting base. When placing the battery cell, the electrode terminals of the top cover of the battery cell are placed facing the first mounting base, and the electrode assembly is placed flat on one side of the support platform, exposing the solder area of ​​the tab. In this way, the probe end of the first test probe can be abutted and connected with the electrode terminals of the top cover. A pressure plate is installed on the support platform to press and position the solder joint area of ​​the tab on the top cover. The second test probe is movable. Passing through the test hole on the pressure plate, the probe tip of the second test probe contacts the solder joint area of ​​the tab. The combined action of the first and second test probes forms a detection circuit. Based on the voltage and current measured at the corresponding welding point in the solder joint area, the resistance meter automatically calculates the resistance value of that welding point, records the tested welding point and its corresponding resistance value, and allows operators to quickly determine whether the tab welding of the battery cell under test is qualified or defective by comparing the measured resistance value with the standard resistance value, thus improving the efficiency of tab welding quality inspection. Typically, the edge of the solder joint area of ​​the tab is a weak area, prone to breakage and other welding defects. Therefore, by setting multiple test holes spaced around the edge of the solder joint area, the second test probe can pass through multiple test holes one by one to test multiple welding points on the edge of the solder joint area of ​​the tab, achieving higher testing accuracy.

[0008] According to some embodiments of this application, the support platform has a positioning groove for positioning the top cover.

[0009] In the above scheme, when testing the solder area of ​​the tab using the second test probe, it is usually necessary to test multiple solder points one by one. This results in a wider testing range and higher testing accuracy for the solder area of ​​the tab. Therefore, the positioning accuracy of the top cover of the battery cell is particularly important during the testing process. By setting a positioning groove on the support platform, the width of the positioning groove is adapted to the size of the top cover of the battery cell. In this way, the positioning groove can accommodate at least a part of the top cover of the battery cell. With the help of the pressure plate, the position of the top cover is not easily displaced during the testing of the solder area of ​​the tab, thereby improving the testing accuracy and reducing the risk of testing errors caused by the movement of the top cover.

[0010] According to some embodiments of this application, the positioning groove extends along a first direction, and one end of the positioning groove extends along the first direction to the edge of the support platform.

[0011] In the above solution, by extending one end of the positioning groove to the edge of the support platform, the battery cells can be inserted from the opening end of the positioning groove and moved to the testing position along the extension direction of the groove during loading, facilitating accurate loading of the battery cells. At the same time, the longer positioning groove can accommodate the testing needs of battery cells of different specifications, thus broadening its applicability.

[0012] According to some embodiments of this application, the bottom wall of the positioning groove is provided with a clearance hole for exposing the electrode terminals on the top cover, and the probe end of the first test probe passes through the clearance hole and abuts against the electrode terminals.

[0013] In the above scheme, by providing a clearance hole in the bottom wall of the positioning groove, the clearance hole can avoid the electrode terminals on the top cover, which is beneficial for the probe end of the first test probe on the first mounting base to be held and fixed against the electrode terminals on the top cover through the clearance hole.

[0014] According to some embodiments of this application, the pressure plate includes a main body and a detection part. The detection part protrudes from one end of the main body in a first direction. Along the thickness direction of the pressure plate, the detection part at least covers the solder area of ​​the electrode tab, and the detection hole is located in the detection part.

[0015] In the above scheme, the pressure plate includes a main body and a detection part. The main body can press and fix the top cover except for the area of ​​the electrode tab, and play a preliminary role in pressing and fixing the top cover. The detection part protrudes from one end of the main body in a first direction. The detection part is located on the side above the electrode tab. The detection part can further press and fix the solder area of ​​the electrode tab and cover the electrode tab to keep the position of the electrode tab from moving during the test. The detection hole is located on the detection part, so that the probe end of the second test probe can pass through the detection hole and directly contact the solder area of ​​the electrode tab, and cooperate with the first test probe to realize the detection of the solder joint of the electrode tab.

[0016] According to some embodiments of this application, the side of the detection section facing the solder area of ​​the electrode tab has a protrusion, which is used to abut the solder area of ​​the electrode tab. On the same projection plane perpendicular to the thickness direction of the pressure plate, the orthographic projection of multiple detection holes does not overlap with the orthographic projection of the protrusion, and the multiple detection holes are located outside the protrusion.

[0017] In the above scheme, since the central area of ​​the solder area of ​​the electrode tab is recessed compared to the edge area of ​​the solder area, by providing a protrusion on the side of the detection unit facing the solder area of ​​the electrode tab, the detection unit can effectively resist the solder area of ​​the electrode tab through the protrusion, so that the positioning effect of the detection unit on the solder area of ​​the electrode tab is better and the risk of the electrode tab moving during the test is reduced.

[0018] According to some embodiments of this application, the number of detection units is two, and the two detection units are arranged at intervals along a second direction, which is perpendicular to the first direction.

[0019] In the above scheme, two testing units are used, which can be adapted to test the solder areas of the electrode tabs on both sides of the second direction of the top cover. There is no need to adjust the position of the pressure plate, and the test can be completed in one go, which improves the testing efficiency.

[0020] According to some embodiments of this application, the electrode detection and positioning fixture further includes a pressing and driving assembly, which is disposed on a support platform and is used to apply pressure to the pressure plate to press and fix the top cover in the positioning groove.

[0021] In the above scheme, by setting up the pressure driving component, the pressure driving component can apply pressure to the pressure plate, so that the pressure plate presses tightly against the top cover of the battery cell, thereby ensuring the position of the battery cell under test during the test and reducing the risk of affecting the test accuracy due to the displacement of the top cover position during the test.

[0022] According to some embodiments of this application, the pressure drive assembly includes an elbow clamp, which is mounted on a support platform via a base, and the elbow clamp has a pressure portion for contacting a pressure plate.

[0023] In the above solution, the pressing drive component is an elbow clamp. The elbow clamp has a simple structure and can be purchased directly. The operator can manually apply pressure to the pressure plate through the pressing part of the elbow clamp to achieve the pressing and positioning of the pressure plate on the top cover. The operation is convenient and quick. The operator can manually control the pressing force of the pressure plate according to the needs.

[0024] According to some embodiments of this application, the pressure-holding drive assembly further includes a connector that connects the pressure plate and the pressure-holding portion; the pressure plate is pivotally connected to the base, and the connector is used to drive the pressure plate to rotate upward relative to the base away from the top cover when the pressure-holding portion moves toward the side away from the support platform.

[0025] In the above scheme, the elbow clamp can only provide holding force to the pressure plate. After the top cover of the battery cell is tested, the pressure plate and the holding part are connected by the connecting part, and the pressure plate is pivotally connected to the base. In this way, when the elbow clamp drives the holding part to move away from the support platform, the holding part can drive the pressure plate to rotate upward relative to the base through the connecting part, thereby separating it from the top cover. There is no need to manually separate the pressure plate from the top cover, which reduces the difficulty of operation.

[0026] Secondly, this application also provides a detection system, which includes a tab detection and positioning fixture and a resistor as described in any of the foregoing embodiments. The first test probe of the resistor is mounted on a first mounting base, and the probe end of the second test probe passes through the detection hole of the pressure plate and abuts against the solder area of ​​the tab.

[0027] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded schematic diagram of a battery cell provided in some embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the electrode detection and positioning fixture provided in some embodiments of this application;

[0031] Figure 3 for Figure 2 Enlarged diagram of A in the middle;

[0032] Figure 4 This is a schematic diagram of the electrode detection and positioning fixture provided in some embodiments of this application from another angle;

[0033] Figure 5 This is an exploded view of the electrode detection and positioning fixture provided in some embodiments of this application;

[0034] Figure 6 This is a front view of the pressure plate in the tab detection and positioning fixture provided in some embodiments of this application.

[0035] Icons: 100-Electrode detection and positioning fixture; 10-Support platform; 11-Support plate; 12-Support foot; 13-Positioning groove; 14-Bearing surface; 20-First mounting base; 21-Probe fixing block; 30-Pressure plate; 31-Main body; 32-Detection part; 321-Detection hole; 322-Protrusion; 40-Pressure holding drive assembly; 41-Elbow clamp; 411-Pressure holding part; 42-Base; 200-First detection probe; 201-Second detection probe; 300-Battery cell; 301-Top cover; 302-Soldering area of ​​electrode; 303-Electrode assembly; 304-Electrode terminal; 305-Outer shell; 306-Housing shell; X-First direction; Y-Second direction. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0038] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0041] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0042] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0043] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0044] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0045] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0046] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0047] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0048] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0049] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0050] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0051] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0052] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0054] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0055] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0056] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0057] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc.

[0058] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0059] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0060] In some embodiments, the diaphragm is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0061] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0062] In some embodiments, the membrane is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0063] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0064] In some implementations, the electrode assembly is a stacked structure.

[0065] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0066] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0067] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0068] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0069] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0070] In battery technology, due to the influence of welding processes, welding environment, and the characteristics of welding materials, cracking at the edge of the electrode tab's weld is unavoidable (pores and cracks at the weld edge hinder electron transport). This leads to a decline in battery performance, such as capacity decay and increased internal resistance, and also significantly increases battery safety risks, such as causing internal short circuits or thermal runaway, or even serious accidents like battery fires or explosions. Therefore, for lithium-ion batteries without adapter plates, monitoring the degree of cracking at the edge of the laser-etched electrode tab is an indispensable and critical step. For laser-etched electrode defects without adapter plates, metallographic CCD and conventional CT inspection are commonly used. Laser-etched electrode defects are often detected by obtaining cross-sectional images of the target inspection area of ​​the electrode through metallographic cutting and CT scanning. These two methods can relatively intuitively quantify the cracking rate of a single cross-section; however, the inspection time is relatively long, with pretreatment time for metallographic cutting samples being approximately 30 minutes and sampling time for CT scanning being approximately 20 minutes, resulting in low efficiency for electrode tab detection.

[0071] In view of this, in order to improve the efficiency of detecting the welding quality of the tabs, some embodiments of this application provide a tab detection and positioning fixture. The tab detection and positioning fixture is used in conjunction with a resistance meter. The resistance meter has a first test probe and a second test probe. The tab detection and positioning fixture includes a support platform, a first mounting base, and a pressure plate. The support platform has a bearing surface for bearing the battery cell to be tested. The first mounting base is disposed on the side of the support platform away from the bearing surface and is used for mounting the first test probe. The probe end of the first test probe is used to abut against the electrode terminal on the top cover of the battery cell. The pressure plate is disposed on the support platform, and at least a portion of the pressure plate presses against the solder area of ​​the tab on the top cover. The pressure plate has a detection hole for the probe end of the second test probe to pass through.

[0072] The battery device provided in this application embodiment has a first probe of a resistance meter mounted on a first mounting base. When placing a battery cell, the electrode terminals of the top cover of the battery cell face the first mounting base, and the electrode assembly is placed flat on a support platform to one side. This allows the probe tip of the first probe to abut against and connect with the electrode terminals of the top cover. A pressure plate is provided on the support platform to press and position the solder area of ​​the tab on the top cover. The second probe is movable, passing through a detection hole on the pressure plate. The probe tip of the second probe contacts the solder area of ​​the tab. A detection circuit is formed by the cooperation of the first and second probes. Based on the voltage and current measured at the solder point corresponding to the solder area, the resistance meter automatically calculates the resistance value of the solder point, records the tested solder point and its corresponding resistance value, and compares it with a standard resistance value. Based on the resistance value, the operator can quickly determine whether the tab welding of the battery cell under test is qualified or defective, thereby improving the efficiency of tab welding quality inspection.

[0073] This application provides a tab detection and positioning fixture. Please refer to... Figures 2 to 5 The tab detection and positioning fixture 100 is used in conjunction with a resistance meter. The resistance meter has a first test probe 200 and a second test probe 201. The tab detection and positioning fixture 100 includes a support platform 10, a first mounting base 20, and a pressure plate 30. The support platform 10 has a bearing surface 14 for bearing the battery cell 300 to be tested. The first mounting base 20 is disposed on the side of the support platform 10 away from the bearing surface 14. The first mounting base 20 is used for mounting the first test probe 200. The probe end of the first test probe 200 is used to abut against the electrode terminal 304 on the top cover 301 of the battery cell 300. The pressure plate 30 is disposed on the support platform 10. At least a portion of the pressure plate 30 presses against the solder area 302 of the tab on the top cover 301. The pressure plate 30 has a detection hole 321 for the probe end of the second test probe 201 to pass through. There are multiple detection holes 321, which are spaced apart around the edge of the solder area 302 of the tab.

[0074] Please refer to Figure 1 , Figure 1 This is an exploded view of the battery cell 300. The battery cell 300 includes a housing 305, an electrode assembly 303, and electrode terminals 304. The housing 305 includes a casing 306 and a top cover 301. The casing 306 has an opening, and the top cover 301 closes the opening to isolate the internal environment of the battery cell 300 from the external environment.

[0075] The housing 306 is an assembly used in conjunction with the top cover 301 to form the internal environment of the battery cell 300, wherein the formed internal environment can accommodate the electrode assembly 303, electrolyte, and other components. The housing 306 and the top cover 301 can be separate components. The housing 306 can be of various shapes and sizes.

[0076] The top cover 301 refers to a component that covers the opening of the housing 306 to isolate the internal environment of the battery cell 300 from the external environment. The shape of the top cover 301 can be adapted to the shape of the housing 306 to fit it. Optionally, the top cover 301 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 301 is less prone to deformation under pressure and impact, giving the battery cell 300 higher structural strength and improved reliability. Functional components such as electrode terminals 304 can be provided on the top cover 301. The electrode terminals 304 are provided on the top cover 301. The electrode terminals 304 can be used for electrical connection with the electrode assembly 303 to output or input electrical energy to the battery cell 300. The material of the top cover 301 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0077] Electrode assembly 303 is a component in the battery cell 300 where electrochemical reactions occur. The housing 306 may contain one or more electrode assemblies 303.

[0078] The support platform 10 refers to the platform that provides load-bearing function for the electrode detection and positioning fixture. The support platform 10 includes a support plate 11 and multiple support legs 12. The multiple support legs 12 are respectively connected to the four edges of the support plate 11, and the support legs 12 allow the support plate 11 to be suspended in the air. The support plate 11 provides load-bearing function for the battery cell 300 to be tested.

[0079] The first mounting base 20 refers to the mounting body that provides mounting function for the first test probe 200. The first mounting base 20 is provided with a mounting groove for arranging the first test probe 200. At least a portion of the first test probe 200 is installed in the mounting groove of the first mounting base 20, and at least a portion of the probe fixing block 21 is inserted into the mounting groove, which limits and fixes the first test probe 200 in the mounting groove. The probe tip of the first test probe 200 extends from the side of the first mounting base 20 facing the support platform 10 and passes through the clearance hole opened on the support platform 10, so that the probe tip of the first test probe 200 can abut against and contact the electrode terminal 304 on the top cover 301 of the battery cell 300 on the support platform 10.

[0080] The bearing surface 14 refers to a wall surface on the support platform 10 that supports the battery cell 300, and the bearing surface 14 provides a bearing function for the battery cell 300. A pressure plate 30 is disposed on the support platform 10, located above the top cover 301 of the battery cell 300 on the support platform 10. The pressure plate 30 can press and limit the tabs on the top cover 301, allowing the top cover 301 to be fixed to the support platform 10. The pressure plate 30 can be connected to a pressure-driving assembly 40, which provides pressure to the pressure block to fix the top cover 301 of the battery cell 300. Of course, the pressure plate 30 can also press the top cover 301 of the battery cell 300 based on its own weight, or the pressure plate 30 can be equipped with a counterweight, as long as the pressure plate 30 can provide a pressing force to the top cover 301 of the battery cell 300.

[0081] The fact that at least a portion of the pressure plate 30 presses against the solder area 302 of the tab on the top cover 301 means that at least a portion of the pressure plate 30 can cover the solder area 302 of the tab on the top cover 301. In this way, the second test probe 201 can come into contact with the welding point of the solder area 302 of the tab through the test hole 321 on the pressure plate 30, so as to test the welding condition of the tab of the battery cell 300.

[0082] The number of detection holes 321 can be multiple, such as two, four, or six. The specific number of detection holes 321 can be determined according to the actual situation. In this embodiment, there are six detection holes 321, which are arranged in two rows on both sides of the solder area in the second direction Y, which is perpendicular to the first direction X.

[0083] Each test hole 321 allows the two probe ends of the second test probe 201 to pass through, that is, the two probe ends of the second test probe 201 pass through the same test hole 321 and contact the solder area 302 of the electrode tab.

[0084] Normally, the electrode terminal 304 of the battery cell measured by the resistance meter is the positive electrode terminal. This is because the positive electrode is made of aluminum, which has a larger coefficient of thermal contraction and a larger thermal expansion system. As a result, it is more prone to cracking and welding defects during welding.

[0085] The resistor can be a four-probe DC resistor, which is existing technology and readily available for purchase. The first test probe 200 and the second test probe 201 are the probe terminals of the resistor. Both the first and second test probes 200 and 201 are electrically connected to the resistor body via wires and are part of the resistor. Each of the first and second test probes 200 and 201 has two probes, forming a four-probe resistor. The four probes are divided into two voltage probes and two current probes; the two voltage probes are one positive and one negative, and the two current probes are one positive and one negative. The positive voltage probe and the positive current probe are on the same test probe, for example, designated as the first test probe 200; the negative voltage probe and the negative current probe are on the same test probe, designated as the second test probe 201. The line connecting the positive and negative voltage probes is parallel to the line connecting the positive and negative current probes.

[0086] That is, the polarities of the probes in the first test probe 200 and the second test probe 201 are opposite. For example, the two probes in the first test probe 200 are a positive current probe and a positive voltage probe, and the two probes in the second test probe 201 are a negative current probe and a negative current probe. In other words, after the first test probe 200 and the second test probe 201 form a circuit, the positive current probe in the first test probe 200 and the negative current probe in the second test probe 201 form a circuit to detect the current at the corresponding welding point of the electrode tab, and the positive voltage probe in the first test probe 200 and the negative voltage probe in the second test probe 201 form a circuit to detect the voltage at the corresponding welding point of the electrode tab.

[0087] The resistance meter automatically calculates and displays the resistance value based on Ohm's law (R = U / I, where R is the welding resistance, U is the voltage applied by the resistance meter to the two ends of the battery cell 300 under test, and I is the current flowing through the solder area). The staff can compare the measured resistance value with the resistance value of the qualified test part or the resistance value of the industry standard to determine whether the welding point is qualified and whether there are welding defects.

[0088] Specifically, when the tested resistance value is within the expected (standard) range, it indicates that the welding quality of the tab's solder joint on the tested 300mm battery cell meets the requirements and is a qualified product. When the tested resistance value is significantly higher than the expected value, the solder joint may have problems such as incomplete soldering, poor contact, or material defects, indicating that the soldering quality of the tab is poor and it is a substandard product. When the measured resistance value is significantly lower than the expected value, it may indicate that the solder joint has a short circuit or material abnormality, indicating that the soldering quality of the tab is poor and it is a substandard product.

[0089] In the technical solution of this application embodiment, the support platform 10 can support the battery cell 300 to be tested. The battery cell 300 to be tested is placed on the support platform 10. The first mounting base 20 is installed on the side of the support platform 10 away from the bearing surface 14. The first test probe 200 of the resistance meter is installed on the first mounting base 20. The electrode terminal 304 of the top cover 301 of the battery cell 300 is placed facing the first mounting base 20. The electrode assembly is placed flat on the support platform to one side, exposing the solder area 302 of the tab. In this way, the probe end of the first test probe 200 can be abutted and connected with the electrode terminal 304 of the top cover 301. A pressure plate 30 is installed on the support platform 10 to press and position the solder area 302 of the tab on the top cover 301. The second test probe 201 is movable. The second test probe 201 passes through the test hole 321 on the pressure plate 30, and the probe end of the second test probe 201 contacts the solder area 302 of the tab. The resistance meter forms a test circuit with the cooperation of the first test probe 200 and the second test probe 201. Based on the voltage and current measured at the welding point corresponding to the solder area 302 of the tab, the resistance meter automatically calculates the resistance value of the welding point and records the tested welding point and the corresponding resistance value. The operator can compare the measured resistance value with the resistance standard value to quickly determine whether the welding quality of the tab of the battery cell under test is qualified (OK sample) or inferior (NG sample), thereby improving the efficiency of testing the welding quality of the tab.

[0090] Normally, the edge of the solder area 302 of the electrode tab is a weak area, and the edge of the solder area is a region where welding defects such as breakage of the electrode tab are likely to occur. Therefore, by setting the number of detection holes 321 to multiple, and setting multiple detection holes 321 at intervals around the edge of the solder area 302 of the electrode tab, the second detection probe 201 can pass through multiple detection holes 321 one by one to realize the testing of multiple welding points on the edge of the solder area 302 of the electrode tab, and the testing accuracy is higher.

[0091] According to some embodiments of this application, please refer to Figure 1 The support platform 10 has a positioning groove 13, which is used to position the top cover 301.

[0092] The positioning groove 13 refers to the groove structure formed by the recess on the support platform 10. The planar dimensions of the positioning groove 13 are adapted to the planar dimensions of the top cover 301 of the battery cell 300. In the thickness direction of the positioning groove 13, the positioning groove 13 can accommodate at least a portion of the top cover 301 in the thickness direction.

[0093] When testing the solder area 302 of the electrode tab using the second test probe 201, it is usually necessary to test multiple solder points one by one. This results in a wider testing range and higher testing accuracy for the solder area 302 of the electrode tab. Therefore, the positioning accuracy of the top cover 301 of the battery cell 300 is particularly important during the testing process. By providing a positioning groove 13 on the support platform 10, the width of the positioning groove 13 is adapted to the size of the top cover 301 of the battery cell 300. In this way, the positioning groove 13 can accommodate at least a portion of the top cover 301 of the battery cell 300. With the cooperation of the pressure plate 30, the position of the top cover 301 is less likely to shift during the testing of the solder area 302 of the electrode tab, thereby improving the testing accuracy and reducing the risk of testing errors caused by the movement of the top cover 301.

[0094] According to some embodiments of this application, please refer to Figure 1 The positioning groove 13 extends along the first direction X, and one end of the positioning groove 13 extends along the first direction X to the edge of the support platform 10.

[0095] The fact that one end of the positioning groove 13 extends to the edge of the support platform 10 in the first direction X means that one end of the positioning groove 13 passes through the edge of the support platform 10 in the first direction X and forms an entrance at the edge of the support platform 10 in the first direction X. This entrance allows the battery cell 300 to slide into the positioning groove 13 in the first direction X.

[0096] By extending one end of the positioning groove 13 to the edge of the support platform 10, the battery cell 300 can be inserted through the opening end of the positioning groove 13 and moved to the test position along the extension direction of the positioning groove 13 during loading, facilitating accurate loading of the battery cell 300. At the same time, the positioning groove 13 is longer, which can adapt to the testing needs of battery cells 300 of different specifications, thus broadening its applicability.

[0097] According to some embodiments of this application, the bottom wall of the positioning groove 13 is provided with a clearance hole (not shown in the figure) for exposing the electrode terminal 304 on the top cover 301, and the probe end of the first test probe 200 passes through the clearance hole and abuts against the electrode terminal 304.

[0098] The clearance hole is a through hole structure provided on the bottom wall of the positioning groove 13. The clearance hole is provided through the thickness direction of the support platform 10. The probe end of the first test probe 200 can abut against the electrode terminal 304 on the top cover 301 through the clearance hole. Specifically, a part of the electrode terminal 304 on the top cover 301 can be located in the clearance hole, and the probe end of the first test probe 200 abuts against the electrode terminal 304.

[0099] By providing a clearance hole in the bottom wall of the positioning groove 13, the clearance hole can avoid the electrode terminal 304 on the top cover 301, which is beneficial for the probe end of the first test probe 200 on the first mounting base 20 to be held and fixed against the electrode terminal 304 on the top cover 301 through the clearance hole.

[0100] Based on some embodiments of this application, please refer to... Figure 2 and Figure 3 The pressure plate 30 includes a main body 31 and a detection part 32. The detection part 32 protrudes from one end of the main body 31 in a first direction X. Along the thickness direction of the pressure plate 30, the detection part 32 at least covers the solder area 302 of the electrode tab. The detection hole 321 is located in the detection part 32.

[0101] The main body 31 refers to the main body 31 of the pressure plate 30. The main body 31 is pressed and contacted with the area of ​​the de-electrode tab of the top cover 301. The detection part 32 refers to the structure located at the first X end of the main body 31. The detection part 32 at least covers the solder area 302 of the tab, and the probe end of the second test probe 201 can pass through the detection hole 321 on the detection part 32 and contact the solder area 302 of the tab.

[0102] The pressure plate 30 includes a main body 31 and a detection part 32. The main body 31 can press and fix the top cover 301 except for the area of ​​the electrode tab, and play a preliminary pressing and fixing role for the top cover 301. The detection part 32 protrudes from one end of the main body 31 in the first direction X. The detection part 32 is located on the side above the electrode tab. The detection part 32 can further press and fix the solder area 302 of the electrode tab and cover the electrode tab to keep the position of the electrode tab from moving during the test. The detection hole 321 is located on the detection part 32, so that the probe end of the second detection probe 201 can pass through the detection hole 321 and directly contact the solder area 302 of the electrode tab, and cooperate with the first detection probe 200 to realize the detection of the solder joint of the electrode tab.

[0103] According to some embodiments of this application, please refer to Figure 6 The detection section 32 has a protrusion 322 on the side facing the solder area 302 of the electrode tab. The protrusion 322 is used to support the solder area 302 of the electrode tab. On the same projection plane perpendicular to the thickness direction of the pressure plate 30, the orthographic projection of the plurality of detection holes 321 does not overlap with the orthographic projection of the protrusion 322, and the plurality of detection holes 321 are located outside the protrusion 322.

[0104] The protrusion 322 refers to the protruding structure provided on the side of the detection unit 32 facing the top cover 301. The protrusion 322 corresponds to the recessed area of ​​the solder area 302 of the electrode tab. The detection unit 32 abuts against the solder area 302 of the electrode tab through the protrusion 322, thereby pressing the electrode tab of the top cover 301 tightly. Of course, the size of the protrusion 322 can be smaller than the area of ​​the solder area 302 of the electrode tab, as long as the protrusion 322 of the detection unit 32 can abut against the solder area 302 of the electrode tab.

[0105] The orthographic projection of the multiple detection holes 321 does not overlap with the orthographic projection of the protrusion 322, and the multiple detection holes 321 are located outside the protrusion 322. This means that the multiple detection holes 321 are not located on the protrusion 322, but rather that the multiple detection holes 321 are located on the detection part 32 and outside the protrusion 322.

[0106] Since the central area of ​​the solder area 302 of the electrode tab is recessed compared to the edge area of ​​the solder area, by providing a protrusion 322 on the side of the detection unit 32 facing the solder area 302 of the electrode tab, the detection unit 32 can effectively resist the solder area 302 of the electrode tab through the protrusion 322, so that the positioning effect of the detection unit 32 on the solder area 302 of the electrode tab is better, and the risk of the electrode tab moving during the test is reduced.

[0107] According to some embodiments of this application, please refer to Figure 2 There are two detection units 32, which are spaced apart along the second direction Y, which is perpendicular to the first direction X.

[0108] The number of detection units 32 is two, which can be adapted to detect the solder areas 302 of the electrode tabs on both sides of the second direction Y of the top cover 301. There is no need to adjust the position of the pressure plate 30, and the test can be completed in one go, which improves the testing efficiency.

[0109] According to some embodiments of this application, please refer to Figure 2 The electrode detection and positioning fixture also includes a pressing drive assembly 40, which is disposed on the support platform 10. The pressing drive assembly 40 is used to apply pressure to the pressure plate 30 to press and fix the top cover 301 in the positioning groove 13.

[0110] The pressing drive assembly 40 can be a variety of pressing structures. For example, the pressing drive assembly 40 can be a cylinder, hydraulic cylinder, electric push rod or elbow clamp 41, etc. The specific structure of the pressing drive assembly 40 can be determined according to the actual situation.

[0111] By setting the pressure driving component 40, the pressure driving component 40 can apply pressure to the pressure plate 30, so that the pressure plate 30 presses tightly against the top cover 301 of the battery cell 300, thereby ensuring the position of the battery cell 300 under test during the test and reducing the risk of affecting the test accuracy due to the position of the top cover 301 shifting during the test.

[0112] According to some embodiments of this application, please refer to Figure 2 and Figure 5 The pressure drive assembly 40 includes an elbow clamp 41, which is mounted on the support platform 10 via a base 42. The elbow clamp 41 has a pressure portion 411 for contacting the pressure plate 30.

[0113] The elbow clamp 41 is a handheld horizontal elbow clamp, which can be directly purchased. The elbow clamp generally includes a handle, a mounting base, a linkage assembly, and a holding part 411. The linkage assembly is mounted on the mounting base, the handle is connected to one end of the linkage assembly, and the holding part 411 is connected to the other end of the linkage assembly. The mounting base can be connected to the base 42. By acting on the handle, the holding part 411 can be moved under the transmission action of the linkage assembly.

[0114] The pressing drive component 40 is an elbow clamp 41. The elbow clamp 41 has a simple structure and can be purchased directly. The operator can manually apply pressure to the pressure plate 30 through the pressing part 411 of the elbow clamp 41 to achieve the pressing and positioning of the pressure plate 30 on the top cover 301. The operation is convenient and quick. The operator can manually control the pressing force of the pressure plate 30 according to the needs.

[0115] According to some embodiments of this application, the pressure drive assembly 40 further includes a connector that connects the pressure plate 30 and the pressure portion 411; the pressure plate 30 is pivotally connected to the base 42, and the connector is used to drive the pressure plate 30 to rotate upward relative to the base 42 away from the top cover 301 when the pressure portion 411 moves toward the side away from the support platform 10.

[0116] The connector refers to the connecting component provided between the holding part 411 and the pressure plate 30. The connector can be an elastic rope, a spring, or a telescopic connecting component, etc. In this way, when the holding part 411 applies pressure to the pressure plate 30, the connector can deform and will not interfere with the stroke of the holding part 411. When the holding part 411 moves away from the pressure plate 30, it can drive the pressure plate 30 and the holding part 411 to move together through the connector, so as to separate from the top cover 301.

[0117] The elbow clamp 41 can only provide holding force to the pressure plate 30. After the top cover 301 of the battery cell 300 is tested, the pressure plate 30 and the holding part 411 are connected by the connecting part, and the pressure plate 30 is pivotally connected to the base 42. In this way, when the elbow clamp 41 drives the holding part 411 to move away from the support platform, the holding part 411 can drive the pressure plate 30 to rotate upward relative to the base 42 through the connecting part, thereby separating it from the top cover 301. There is no need to manually separate the pressure plate 30 from the top cover 301, which reduces the difficulty of operation.

[0118] According to some embodiments of this application, the connector is an elastic drawstring. By using an elastic drawstring as the connector, when the holding part 411 applies pressure to the pressure plate 30, the elastic drawstring remains loose and will not interfere with the stroke of the holding part 411. Furthermore, when the holding part 411 moves away from the pressure plate 30, the elastic drawstring can cause the pressure plate 30 to separate from the top cover 301.

[0119] This application embodiment also provides a detection system, which includes the tab detection and positioning fixture 100 of any of the foregoing embodiments and a resistor. The first test probe 200 of the resistor is mounted on the first mounting base 20, and the probe end of the second test probe 201 passes through the detection hole 321 of the pressure plate 30 and abuts against the solder area 302 of the tab.

[0120] In some embodiments, the tab detection and positioning fixture 100 includes a support platform 10, a first mounting base 20, and a pressure plate 30. The support platform 10 has a bearing surface 14 for bearing the battery cell 300 to be tested. The first mounting base 20 is disposed on the side of the support platform 10 away from the bearing surface 14 and is used for mounting a first test probe 200. The probe end of the first test probe 200 is used to abut against the electrode terminal 304 on the top cover 301 of the battery cell 300. The pressure plate 30 is disposed on the support platform 10, and at least a portion of the pressure plate 300 presses against the solder area 302 of the tab on the top cover 301. The pressure plate 30 has a detection hole 321 for the probe end of the second test probe 201 to pass through. The support platform 10 has a positioning groove 13 for positioning the top cover 301. The positioning groove 13 extends along a first direction X, and one end of the positioning groove 13 extends along the first direction X to the edge of the support platform 10.

[0121] The first mounting base 20 is installed on the side of the support platform 10 away from the bearing surface 14. The first test probe 200 of the resistance meter is installed on the first mounting base 20. The electrode terminal 304 of the top cover 301 of the battery cell 300 is placed facing the first mounting base 20, so that the probe end of the first test probe 200 can be abutted and connected with the electrode terminal 304 of the top cover 301. A pressure plate 30 is provided on the support platform 10. The pressure plate 30 can press and position the solder area 302 of the electrode tab on the top cover 301. The second test probe 201 is movable. The second test probe 201 passes through the test hole 321 on the pressure plate 30. The probe end of the second test probe 201 contacts the solder area 302 of the electrode tab. The resistance meter forms a test circuit under the cooperation of the first test probe 200 and the second test probe 201. Based on the voltage and current measured at the solder point corresponding to the solder area, the resistance meter automatically calculates the resistance value of the solder point, records the tested solder point and the corresponding resistance value, and compares it with the resistance standard value. It can be determined whether there is a problem of poor soldering, poor contact or material defects at the solder point. The width of the positioning groove 13 is adapted to the size of the top cover 301 of the battery cell 300. This allows the positioning groove 13 to accommodate at least a portion of the top cover 301 of the battery cell 300. Combined with the pressure plate 30, this prevents the top cover 301 from shifting during the inspection of the solder area 302 of the electrode tabs, thereby improving testing accuracy and reducing the risk of testing errors caused by the movement of the top cover 301. When loading the battery cell 300, it can be inserted into the opening of the positioning groove 13 and moved along the extension direction of the groove 13 to the testing position, facilitating precise loading of the battery cell 300. Furthermore, the positioning groove 13 is longer, adaptable to the testing needs of battery cells 300 of different specifications, thus broadening its applicability.

[0122] In some embodiments, the pressure plate 30 includes a main body 31 and a detection part 32. The detection part 32 protrudes from one end of the main body 31 in a first direction X. Along the thickness direction of the pressure plate 30, the detection part 32 at least covers the solder area 302 of the tab. Detection holes 321 are located in the detection part 32, and there are multiple detection holes 321. The multiple detection holes 321 are spaced apart around the edge of the solder area 302 of the tab. The side of the detection part 32 facing the solder area 302 of the tab has a protrusion 322, and the multiple detection holes 321 are located on the outer periphery of the protrusion 322. The protrusion 322 is used to abut against the solder area 302 of the tab.

[0123] The main body 31 can press and fix the top cover 301 except for the area of ​​the tab, providing initial pressing and fixing. The detection part 32 protrudes from one end of the main body 31 in the first direction X. The detection part 32 is located on the side above the tab. The detection part 32 can further press and fix the solder area 302 of the tab and cover the tab, keeping the position of the tab from moving during the test. The detection hole 321 is located on the detection part 32, so that the probe end of the second detection probe 201 can pass through the detection hole 321 and directly contact the solder area 302 of the tab, cooperating with the first detection probe 200 to detect the solder joints of the tab. Multiple detection holes 321 are set at intervals around the edge of the solder area 302 of the tab. The second detection probe 201 can pass through the multiple detection holes 321 one by one to test multiple solder joints on the edge of the solder area 302 of the tab, achieving higher testing accuracy. By providing a protrusion 322 on the side of the detection unit 32 facing the solder area 302 of the electrode tab, the detection unit 32 can effectively resist the solder area 302 of the electrode tab through the protrusion 322, thereby improving the positioning effect of the detection unit 32 on the solder area 302 of the electrode tab and reducing the risk of the electrode tab moving during the test.

[0124] In some embodiments, the tab detection and positioning fixture 100 further includes a pressing drive assembly 40, which includes an elbow clamp 41. The elbow clamp 41 is mounted on the support platform 10 via a base 42. The elbow clamp 41 has a pressing portion 411 for contacting the pressure plate 30. The pressing drive assembly 40 also includes an elastic pull rope that connects the pressure plate 30 and the pressing portion 411. The pressure plate 30 is pivotally connected to the base 42. The elastic pull rope is used to drive the pressure plate 30 to rotate upward relative to the base 42 away from the top cover 301 when the pressing portion 411 moves toward the side away from the support platform.

[0125] The pressing drive assembly 40 adopts an elbow clamp 41. The elbow clamp 41 has a simple structure and can be directly purchased. The operator can manually apply pressure to the pressure plate 30 through the pressing part 411 of the elbow clamp 41 to achieve the pressing and positioning of the pressure plate 30 on the top cover 301. The operation is convenient and quick, and the operator can manually control the pressing force of the pressure plate 30 according to the needs. When the pressing part 411 applies pressure to the pressure plate 30, the elastic pull rope is loose and will not interfere with the stroke of the pressing part 411. When the pressing part 411 moves away from the pressure plate 30, the elastic pull rope can drive the pressure plate 30 to separate from the top cover 301.

[0126] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tab detection and positioning fixture for use with a resistance meter, the resistance meter having a first test probe and a second test probe, characterized in that, include: A support platform has a bearing surface for supporting the battery cell to be tested; The first mounting base is disposed on the side of the support platform away from the bearing surface. The first mounting base is used for mounting the first test probe. The probe end of the first test probe is used to abut against the electrode terminal on the top cover of the battery cell. A pressure plate is disposed on the support platform, at least a portion of the pressure plate presses against the solder area of ​​the electrode tab on the top cover, and the pressure plate has a detection hole for the probe end of the second test probe to pass through; The number of detection holes is multiple, and the multiple detection holes are arranged at intervals around the edge of the solder area of ​​the electrode tab.

2. The electrode detection and positioning fixture according to claim 1, characterized in that, The support platform has a positioning groove for positioning the top cover.

3. The electrode detection and positioning fixture according to claim 2, characterized in that, The positioning groove extends along a first direction, and one end of the positioning groove extends along the first direction to the edge of the support platform.

4. The electrode detection and positioning fixture according to claim 2, characterized in that, The bottom wall of the positioning groove has a clearance hole for exposing the electrode terminals on the top cover, and the probe end of the first test probe passes through the clearance hole and abuts against the electrode terminals.

5. The electrode detection and positioning fixture according to claim 1, characterized in that, The pressure plate includes a main body and a detection part. The detection part protrudes from one end of the main body in a first direction. Along the thickness direction of the pressure plate, the detection part at least covers the solder area of ​​the electrode tab. The detection hole is located in the detection part.

6. The electrode detection and positioning fixture according to claim 5, characterized in that, The detection section has a protrusion on the side facing the solder area of ​​the electrode tab. The protrusion is used to abut against the solder area of ​​the electrode tab. On the same projection plane perpendicular to the thickness direction of the pressure plate, the orthographic projections of the plurality of detection holes do not overlap with the orthographic projection of the protrusion, and the plurality of detection holes are located outside the protrusion.

7. The electrode detection and positioning fixture according to claim 5, characterized in that, The number of detection units is two, and the two detection units are arranged at intervals along a second direction, which is perpendicular to the first direction.

8. The electrode detection and positioning fixture according to claim 2, characterized in that, The electrode detection and positioning fixture also includes: A pressing drive assembly is disposed on the support platform. The pressing drive assembly is used to apply pressure to the pressure plate to press and fix the top cover into the positioning groove.

9. The electrode detection and positioning fixture according to claim 8, characterized in that, The pressure-holding drive assembly includes an elbow clamp, which is mounted on the support platform via a base, and the elbow clamp has a pressure-holding portion for contacting the pressure plate.

10. The electrode detection and positioning fixture according to claim 9, characterized in that, The pressure-holding drive assembly further includes a connector that connects the pressure plate and the pressure-holding part; The pressure plate is pivotally connected to the base, and the connector is used to drive the pressure plate to rotate upward relative to the base when the pressing part moves toward the side away from the support platform, so as to move away from the top cover.

11. A detection system, characterized in that, The device includes a tab detection and positioning fixture according to any one of claims 1-10 and a resistor, wherein the first test probe of the resistor is mounted on the first mounting base, and the probe end of the second test probe passes through the detection hole of the pressure plate and abuts against the solder area of ​​the tab.

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