A polarity inspection fixture for lithium battery modules

Abstract

This invention provides a lithium battery module polarity inspection fixture, including a main board, probes, and a detection module. The main board is positioned on the battery module via its bottom side. The probes are mounted on the main board, protruding through its bottom and top sides, and corresponding to the detection points of the battery cells in the battery module. The detection module is mounted on the top side of the main board and electrically connected to the probes, and electrically connected to the detection points through the probes, forming a closed loop with the detection module. This invention utilizes paired probes on the main board to contact the exposed metal shell of the QR code area at the cell detection point with double contacts. Combined with the probes and detection module connected by wires, a closed loop is formed. By utilizing the two states of metal conduction / insulation interruption, the polarity judgment of the battery cell is transformed into a circuit continuity judgment, thereby realizing the inspection of the polarity of the battery cells in the battery module. This solves the technical problems of high manual dependence, low efficiency, and poor reliability in battery cell polarity inspection, which cannot meet the needs of automated production lines.

Description

Technical Field

[0001] This utility model relates to the field of battery module tooling technology, and in particular to a lithium battery module polarity inspection tooling. Background Technology

[0002] In the production of lithium battery modules, the polarity of the battery cells is crucial, as any incorrectly installed cell can lead to serious consequences, including short circuits, abnormal voltage readings, and even safety hazards to the entire battery pack. While traditional manual visual inspection is simple, it faces significant challenges in practice: operators need to observe the installation direction of each cell individually, but due to the dense arrangement of cells and limited space, it's difficult to visually cover all positions, easily leading to missed errors. If an incorrectly installed cell flows into subsequent processes, it not only wastes production but may also trigger short circuits, severely impacting product quality and user safety. Because manual inspection is highly dependent on, inefficient, and unreliable, it cannot meet the needs of modern automated production lines. Therefore, a more reliable and automated alternative is urgently needed to improve inspection accuracy and overall process efficiency. Utility Model Content

[0003] This utility model provides a lithium battery module polarity inspection fixture to solve the technical problems of high reliance on manual labor, low efficiency, poor reliability in cell polarity inspection, and inability to meet the needs of automated production lines.

[0004] This utility model provides a polarity inspection fixture for a lithium battery module, including a main board, probes, and a detection module. The main board is positioned on the battery module via its bottom side. The probes are mounted on the main board and protrude through the bottom and top sides of the main board, corresponding to the detection points of the cells in the battery module. The detection module is mounted on the top side of the main board and is electrically connected to the probes, and is electrically connected to the detection points via the probes, forming a closed loop with the detection module.

[0005] In one embodiment of the present invention, the probes corresponding to each detection point are arranged in pairs at intervals, and the paired probes form an electrical connection by abutting the same detection point.

[0006] In one embodiment of the present invention, a wire is also included, which is arranged on the top side of the motherboard and connected between the unpaired probes and between the probes and the detection module.

[0007] In one embodiment of this utility model, the detection module includes a power supply and an alarm element. The alarm element forms a closed loop through wires, probes, detection points and power supply, and emits an audible and visual alarm.

[0008] In one embodiment of this utility model, the detection point is a QR code mark on the battery cell casing, and the QR code mark on the battery cell is made of conductive material.

[0009] In one embodiment of this utility model, insulating paper is also provided on the battery cell casing, and the insulating paper covers the area outside the QR code marking on the battery cell casing.

[0010] In one embodiment of this utility model, the QR code marking on the battery cell casing is arranged opposite to the electrode post on the battery cell casing.

[0011] In one embodiment of this utility model, a positioning pin is provided on the bottom side of the motherboard, and the motherboard matches the positioning hole on the battery module through the positioning pin.

[0012] In one embodiment of the present invention, a limiting block is provided on the bottom side of the motherboard. The limiting block is arranged between the probes of adjacent detection points, and the height of the limiting block is less than the height of the probe.

[0013] In one embodiment of the present invention, a handle is provided on the top side of the motherboard, and the handle is located at both ends of the motherboard.

[0014] The beneficial effects of this utility model are as follows: The lithium battery module polarity inspection fixture proposed in this utility model uses probes arranged in pairs on the main board to contact the exposed metal shell of the cell detection point QR code area with double contacts. The probes and detection module connected by wires form a closed loop. By utilizing the two situations of metal conduction / insulation blockage, the polarity judgment of the cell is transformed into the judgment of circuit continuity, thereby realizing the inspection of the polarity of the cells in the battery module. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram:

[0017] Figure 1 This is a first-view structural schematic diagram of a lithium battery module polarity checking fixture provided in an embodiment of the present invention.

[0018] Figure 2 This is a second-view structural schematic diagram of the lithium battery module polarity checking fixture provided in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram showing the usage status of a lithium battery module polarity checking fixture provided in one embodiment of the present invention.

[0020] The attached figures are labeled as follows:

[0021] 10. Mainboard; 11. Positioning pin; 12. Limit block; 13. Handle; 20. Probe; 30. Detection module; 31. Power supply; 32. Alarm element; 40. Wire; 100. Battery module; 101. Detection point; 102. Insulating paper. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0025] Please see Figures 1 to 3 , Figure 1 A polarity inspection fixture for a lithium battery module 100, provided in one embodiment of the present invention, includes a main board 10, a probe 20, and a detection module 30. The main board 10 is positioned on the battery module 100 via its bottom side. The probe 20 is mounted on the main board 10 and protrudes through the bottom and top sides of the main board 10, corresponding to the detection point 101 of the battery cell in the battery module 100. The detection module 30 is mounted on the top side of the main board 10 and is electrically connected to the probe 20, and is electrically connected to the detection point 101 via the probe 20, forming a closed loop with the detection module 30.

[0026] Specifically, in this embodiment of the invention, the motherboard 10 serves as the supporting base for the tooling. Its bottom side is fixed to the end plate of the battery module 100, achieving alignment and positioning with the battery module 100. Probes 20 on the motherboard 10 are mounted on the surface of the motherboard 10, corresponding to the cell array in the battery module 100, and protrude through the bottom and top sides of the motherboard 10. The bottom probes 20 directly correspond to the detection point 101 of each cell in the battery module 100 (such as the exposed metal casing at the cell's QR code), while the top side is exposed for connection. The design of penetrating both sides of the motherboard 10 ensures that the probes 20 can flexibly contact the cell surface in the vertical direction, achieving electrical connection to determine whether the position of the cell detection point 101 matches the probes 20. The detection module 30 is mounted on the top side of the motherboard 10 and is electrically connected to the probes 20 via wires 40. When the probes 20 contact the cell detection point 101, the entire inspection tooling forms a complete closed loop, and the state of the detection module 30 directly reflects the loop's continuity.

[0027] Furthermore, probe 20 is electrically connected to detection module 30 via wire 40. During the pressing down of motherboard 10, the bottom of probe 20 contacts the cell detection point 101. If the cell is installed correctly, probe 20 touches the metal casing at the QR code location. The metal's conductivity causes current to flow from power supply module 31 to the audible and visual alarm module, closing the circuit, triggering the indicator light to illuminate and the buzzer to sound. Conversely, if the cell is installed incorrectly, probe 20 contacts an area outside detection point 101, such as insulating paper 102, which cannot conduct electricity, breaking the circuit and causing detection module 30 to have no response, thus providing a clear visual indication. Based on the unique design of the cell (detection point 101, such as the metal casing of the QR code area, serves as the only conductive path), this ensures the accuracy and real-time nature of the detection, avoiding subjective errors from manual observation.

[0028] In this way, by directly mounting the motherboard 10 onto the battery module 100 to be tested, and utilizing the probes 20 on the motherboard 10 corresponding to the battery cells of the battery module 100, all cell locations are fully covered. Combined with the closed loop of the detection module 30, automated alarms are achieved without manual intervention. Once the loop is connected or disconnected, an audible and visual alarm immediately provides feedback, preventing incorrectly polarized cells from causing short circuits in subsequent processes. Furthermore, the entire fixture has a compact structure, making it easy to integrate and maintain on the production line, thus ensuring the safety and quality stability of the battery module 100.

[0029] Please see the appendix Figures 1 to 3 In one embodiment, the probes 20 corresponding to each detection point 101 are arranged in pairs at intervals, and the paired probes 20 form an electrical connection by abutting the same detection point 101.

[0030] Specifically, in this embodiment of the invention, the probes 20 in the polarity inspection fixture of the lithium battery module 100 are arranged in pairs at intervals. Each group of probes 20 consists of two independent probe units arranged side by side at a fixed interval on the bottom side of the main board 10. The interval precisely matches the size of the cell detection point 101 (the exposed metal shell in the QR code area). As shown in the figure, this paired structure ensures that each pair of probes 20 corresponds to the detection point 101 of a single cell, and the bottom ends of the paired probes 20 simultaneously abut against the same metal shell surface, forming a double-contact contact.

[0031] Thus, each pair of probes 20 is connected by abutting against the surface of the metal casing at the same detection point 101, and then connected to the electrically connected detection module 30, such as the power supply 31 and the audible and visual alarm element 32, to form a detection circuit. When the battery cell is oriented correctly, the conductivity of the metal casing causes the pair of probes 20 to conduct simultaneously, and the current flows through to form a path, causing the audible and visual alarm module to trigger the buzzer to sound and the indicator light to illuminate, thus achieving a dual audible and visual alarm.

[0032] Please see the appendix Figure 1 and Figure 3 In one embodiment, it further includes a wire 40, which is arranged on the top side of the motherboard 10 and connected between the unpaired probes 20 and between the probes 20 and the detection module 30.

[0033] Specifically, in this embodiment of the invention, the probe 20 and the detection module 30 are connected by a wire 40, and its physical layout and electrical logic directly affect the detection reliability. Specifically, the wire 40 can be divided into two categories: one is the probe 20 connecting wire 40, arranged on the top side of the main board 10, specifically for connecting non-paired probes 20 (e.g., ...). Figure 1 , 3 One type is the connecting wire 40, which runs horizontally through multiple sets of probes 20; the other type is the connecting wire 40, also located on the top side of the main board 10, responsible for electrically connecting the probes 20 to the detection module 30 (power supply 31 and audible and visual alarm element 32) in series. This layered wiring design avoids cross-interference between lines, such as... Figure 1 , 3 As shown, the two types of wires 40 form a clear path above the motherboard 10, which ensures independent signal transmission and facilitates maintenance and repair.

[0034] Furthermore, when the mainboard 10 of the tooling is pressed down and assembled onto the battery module 100, the probe 20 contacts the detection point 101 of the battery cell. If the battery cell is correctly oriented, i.e., the metal casing of the detection point 101 is conductive, current is output from the power supply 31, transmitted through the connecting wire 40 to the connecting wire 40 of the probe 20, and then flows through the paired probes 20 into the metal casing of the battery cell detection point 101 to form a circuit, ultimately triggering the audible and visual alarm signal of the audible and visual alarm element 32. If the battery cell is installed backwards, the current will be blocked at the detection point 101 of the battery cell, preventing the wire 40 from forming a closed circuit, and the alarm element 32 remains silent. Thus, the correctness of the battery cell's assembly orientation can be observed and identified.

[0035] In this way, by placing the wire 40 on the top side of the motherboard 10, away from the bottom side, the risk of short circuits caused by mechanical wear that may occur when the bottom side of the motherboard 10 comes into contact with the battery module 100 structure is avoided. The open wiring on the top side of the motherboard 10 makes fault diagnosis more intuitive, allowing for quick location of any breaks or loose connections in the wire 40 connection. This physically eliminates human visual error and provides higher testing speed for the production line.

[0036] Please see the appendix Figure 1 and Figure 3 In one embodiment, the detection module 30 includes a power supply 31 and an alarm element 32. The alarm element 32 forms a closed loop through the wire 40, the probe 20, the detection point 101 and the power supply 31, and emits an audible and visual alarm.

[0037] Specifically, in this embodiment of the invention, the detection module 30 consists of a power supply 31 and an alarm element 32, both fixed to the top side of the main board 10, forming a compact electrical control hub. The power supply 31, as an energy source, can provide a stable current through a built-in battery or an external power supply 31, and its surface has a power indicator light to indicate the tooling's standby status in real time. The alarm element 32 integrates a buzzer and an indicator light, ensuring that the alarm signal can be identified from multiple angles. Both modules can be rigidly connected to the main board 10, and wires 40 connect from the module interface to the probe 20 on the top side of the main board 10: this modular layout saves space and facilitates quick replacement and maintenance on the production line.

[0038] More specifically, when the mainboard 10 of the polarity checking fixture is assembled into the positioning hole of the module end plate and pressed down, the bottom end of the probe 20 abuts against the exposed metal shell of the QR code area of ​​the cell detection point 101. At this time, current is output from the positive terminal of the power supply 31, flowing through the connecting wire 40 → probe 20 connecting wire 40 → paired probes 20 → metal shell → paired probes 20 → probe 20 connecting wire 40 → connecting wire 40 → alarm element 32 → back to the negative terminal of the power supply 31, forming a complete closed-loop circuit. It should be noted that the characteristic of the metal shell of the cell detection point 101 as a conductive medium is the key to the establishment of the circuit. Only when the cell is installed in the correct direction will the metal surface of the QR code at the detection point 101 be exposed at the position of the corresponding probe 20. Conversely, if the cell is installed in the wrong direction, the area of ​​the probe 20 corresponding to the cell will not be conductive.

[0039] Specifically, the core of alarm triggering lies in the conduction of the loop current. When the loop is closed, the current simultaneously activates the dual audible and visual response of the alarm element 32. The electromagnetic coil inside the buzzer generates high-frequency vibrations when the current passes through, emitting a continuous buzzing sound that can effectively penetrate the ambient noise of the workshop. The indicator light illuminates synchronously, releasing high-contrast red or green light to form a dual audible and visual warning. If the loop is interrupted (e.g., the battery cell is installed backwards or the probe 20 has poor contact), the current disappears, causing the audible and visual elements to simultaneously go silent. At this time, the "no alarm" state itself becomes the fault criterion. The constantly lit indicator light of the power supply 31 serves as a tooling self-test signal. If it does not light up, it indicates that the equipment is not powered on or is damaged, avoiding missed detections due to tooling failure. In other words, any abnormality in any link (e.g., broken wire 40, damaged probe 20, or power supply 31 failure) will cause the loop to open. At this time, the audible and visual alarms will inevitably go silent, which is completely consistent with the reversed battery cell state, fundamentally eliminating the risk of "false pass" detection.

[0040] Thus, the detection module 30 transforms the criterion for cell assembly direction into a physical circuit continuity problem. Its audible and visual alarm mechanism serves not only as a status indicator but also as a result of system self-checking. By achieving lithium battery polarity detection through electrical response, a solution is provided for the testing fixtures of high-paced production lines.

[0041] Please see the appendix Figure 3 In one embodiment, the detection point 101 is a QR code mark on the cell casing, and the QR code mark on the cell is made of conductive material. An insulating paper 102 is also provided on the cell casing, covering the area outside the QR code mark on the cell casing.

[0042] Specifically, in this embodiment of the invention, the detection point 101 is the key functional area of ​​the probe 20 in the polarity checking fixture. By setting the detection point 101 as the QR code marking area on the battery cell casing, the exposed metal casing at the QR code location serves as the conductive medium. This metal casing is typically made of aluminum or nickel-plated steel, possessing excellent conductivity. The other areas of the casing are completely covered with insulating paper 102 (such as PET film), forming a physical interface with clearly defined insulating and conductive polarities. This allows the QR code marking to function as an electrical contact for polarity detection. The metal casing can retain its original conductivity through laser etching, and the insulating paper 102 seamlessly covers the non-QR code area through a hot-pressing process. The boundary between the two is clear and flat, ensuring the absolute reliability of the conductivity of the detection point 101.

[0043] When the battery cell is installed in the correct orientation, the metal casing of the QR code faces the corresponding position of the tooling probe 20. After the paired probes 20 abut against the QR code area of ​​the detection point 101, both contacts simultaneously abut against the metal surface, allowing current to flow freely through the metal casing. Conversely, if the battery cell is installed backwards, the QR code area is covered by the insulating paper 102, and the probes 20 form an electrical insulation barrier upon contact, blocking the current path. By utilizing the binary mechanism of metal conduction / insulation blocking, polarity determination is transformed into circuit continuity determination.

[0044] More specifically, the area of ​​the metal casing of the QR code label is approximately 15×15mm. 2 The diameter of the insulating paper 102 is significantly larger than that of the probe 20 (approximately 1 mm), ensuring full coverage of the conductive surface even with assembly tolerances. The QR code marking on the outer casing provides excellent wear resistance due to its metallic hardness, preventing conductivity degradation over long-term use. The significant difference in dielectric constant between the insulating paper 102 and the metal casing makes the conduction / blocking state criterion absolute, eliminating the possibility of misjudgment at its source.

[0045] Furthermore, the conductive area marked by the QR code at detection point 101 is electrically matched with the tooling probe 20. The spacing between the paired probes 20 matches the width of the QR code mark, and the current-carrying capacity of the metal casing is much higher than the requirements of the detection circuit, avoiding false triggering due to contact resistance. If the insulating paper 102 is accidentally damaged, making the non-QR code area conductive, the tooling will falsely trigger an alarm. However, since the battery module 100 itself requires full-coverage insulation, such anomalies are eliminated during the incoming material inspection stage, thus not affecting the effectiveness of production line testing.

[0046] In this way, by reusing the existing marking area of ​​the QR code on the cell casing of the lithium battery, the conductivity of the material is used to achieve zero additional cost. Compared with the traditional solution of adding a conductive sheet, it avoids changing the cell structure and maintains the readability of the QR code. In addition, it ensures that the position of the probe array 20 corresponds precisely to the position of the cell, thereby improving the reliability of detection.

[0047] In one embodiment, the QR code marking on the cell casing is arranged opposite to the terminal post of the cell casing.

[0048] Specifically, in this embodiment of the invention, the QR code markings and the terminals are arranged in a diagonal distribution to ensure the efficient operation of the polarity checking fixture. A QR code marking (made of exposed metal casing) is located on one side of the battery cell casing, while the positive and negative terminals are located on the other side. This diagonal design completely isolates the QR code area from the terminals in physical space, preventing current from bypassing the terminals and causing interference during the testing process, thus ensuring accurate detection signals.

[0049] Thus, when the cells are assembled into the module, the stacked cells in the battery module 100 maintain the same exposed surfaces at both ends. One end surface is typically equipped with terminals and corresponding electrical connectors, while the other end surface is relatively flat. Therefore, the QR code, serving as the detection point 101, is placed on the back side of the cell terminals. During polarity testing, the battery module 100 is flipped so that the QR code sides of all cells face upwards, and the terminals are located on the back side of the module. This facilitates the assembly of the polarity inspection fixture and makes the QR code marking the only contactable conductive surface of the probe 20 on the fixture, thereby ensuring accurate detection signals.

[0050] Please see the appendix Figure 2 In one embodiment, a positioning pin 11 is provided on the bottom side of the motherboard 10, and the motherboard 10 matches the positioning hole on the battery module 100 through the positioning pin 11.

[0051] Specifically, in this embodiment of the invention, the tooling is quickly positioned by employing a positioning pin 11 structure. The positioning pin 11 can be cylindrical, with the positioning holes of the symmetrical battery module 100 end plate arranged on the edge area of ​​the main board 10. Its surface is hardened to enhance wear resistance. When the tooling needs to be installed for testing, the operator vertically inserts the positioning pin 11 on the bottom side of the main board 10 into the pre-made positioning holes of the battery module 100 end plate. The precise matching between the positioning holes and the positioning pin 11 ensures that the main board 10 and the battery module 100 establish a fixed spatial relationship. Furthermore, the asymmetrically distributed positioning pins 11 on the main board 10 can eliminate angular deviations, keeping the plane of the main board 10 parallel to the module end plate.

[0052] In this way, the physical constraint of the positioning pin 11 ensures the repeatability of the tooling for each inspection. Operators can achieve millimeter-level alignment between the probe 20 and the cell inspection point 101 without professional training, eliminating manual inspection errors, standardizing the inspection process, shortening the single operation time, and providing a guarantee for high-cycle production.

[0053] Please see the appendix Figure 2In one embodiment, a limiting block 12 is provided on the bottom side of the motherboard 10. The limiting block 12 is arranged between the probes 20 of adjacent detection points 101, and the height of the limiting block 12 is less than the height of the probes 20.

[0054] Specifically, in this embodiment of the invention, limiting blocks 12 are arranged in the form of rectangular bosses between pairs of probes 20 at adjacent detection points 101. The limiting blocks 12 can be integrally machined with the main board 10 or manufactured using a high-strength welding process. Their material hardness is higher than that of the probe 20 body, enabling them to withstand repeated impact loads. In terms of spatial layout, each limiting block 12 is located at the boundary area of ​​two sets of probe 20 arrays, completely avoiding the working area of ​​the probe 20 while covering the vulnerable connection parts at the root of the probe 20, forming a grid-like protective barrier. This limits the displacement depth of the probe 20 during vertical downward pressure, preventing overload damage to the probe 20 and ensuring that the dual contacts always maintain stable contact with the metal casing.

[0055] More specifically, the function of the limiting block 12 is achieved through a height difference, with its top surface height controlled to protrude beyond the height of the probe 20. When the tooling is guided downward by the positioning pin 11, the probe 20 first contacts the cell detection point 101 (QR code metal casing), at which point the limiting block 12 maintains a corresponding gap with the cell surface. During the continued downward pressure, the probe 20 absorbs the corresponding pressure until the bottom surface of the limiting block 12 contacts the plane of the battery module 100. The probe 20 and the detection point 101 maintain a corresponding pressure contact state, at which point the limiting block 12 bears the main mechanical load. This prevents the probe 20 from being over-compressed and bent, and also avoids unstable electrical connection between the probe 20 and the detection point 101 due to insufficient downward pressure.

[0056] Furthermore, multiple limit blocks 12 are arranged between the probes 20 at adjacent detection points 101. Their multi-point distribution also forms redundancy protection. Even if a single limit block 12 is damaged by impact, the adjacent limit blocks 12 can still maintain the stroke control capability of the local area. This ensures that the fixture maintains the positional accuracy of the probe 20 relative to the detection point 101 during high-frequency use, thereby avoiding the risk of false detection caused by mechanical damage to the probe 20.

[0057] Please see the appendix Figure 1 In one embodiment, a handle 13 is provided on the top side of the motherboard 10, and the handle 13 is located at both ends of the motherboard 10.

[0058] Specifically, in this embodiment of the invention, the handles 13 are symmetrically fixed to both ends of the main board 10, and have an inverted U-shaped structure. They can be connected to the main board 10 through a hinge mechanism. This allows the operator to stand naturally on both sides of the fixture, and to obtain balanced support when holding the handles 13 with both hands, providing a stable ergonomic basis for the downward pressing action. When performing a testing task, pressing the handles 13 vertically with both hands evenly transmits the force to the entire structure of the main board 10. This allows the downward pressure to be directly guided to the positioning pin 11 system, preventing the main board 10 from being twisted by force. The downward pressing stroke of the handles 13 forms a mechanical linkage with the limit block 12. When the limit block 12 contacts the module plane, the change in tactile sensation transmitted by the handles 13 immediately prompts the operator to stop applying force.

[0059] In one embodiment, after the battery cell module is assembled, as follows: Figure 3 As shown; insert the two positioning pins 11 on the polarity checking fixture into the positioning holes of the module end plate; due to the limiting effect of the positioning pins 11, at this time, all the test probes 20 on the polarity checking fixture fall on the QR code metal shell of the cell detection point 101, and press down vertically on the handle 13; the power supply 31 and alarm element 32 of the detection module 30 on the polarity checking fixture are connected together through the test probes 20, the probe 20 connecting wires 40, and the connecting wires 40, making the circuit conductive; the indicator light and buzzer on the alarm element 32 start to light up and sound. When a cell in the cell module is installed backwards, the probe 20 at the corresponding position of this cell contacts the insulating paper 102; the power supply 31 and alarm element 32 on the polarity checking fixture cannot be connected through the test probes 20, the probe 20 connecting wires 40, and the connecting wires 40 to form a conductive circuit, and the indicator light and buzzer on the alarm element 32 cannot light up or sound. The power supply 31 has a power indicator light as a normal working indication of the polarity checking fixture; the bottom side of the motherboard 10 has a limit block 12 between the probes 20 to prevent damage to the test probes 20 when the polarity checking fixture is pressed too deeply.

[0060] In summary, this utility model provides a lithium battery module polarity checking fixture. By having paired probes on the main board contact the exposed metal casing of the QR code area at the cell detection point with dual contacts, a closed loop is formed with the probes and detection module connected by wires. When the cell is installed correctly, the metal casing of the QR code faces the corresponding position of the fixture probe, and current is conducted through the metal casing. Conversely, if the cell is installed incorrectly, the QR code area is covered by insulating paper, and the probe contact forms an electrical insulation barrier, blocking the current path. Thus, by utilizing the binary mechanism of metal conduction / insulation blocking, polarity judgment is transformed into circuit continuity judgment, thereby realizing the checking of cell polarity in the battery module and eliminating the risks caused by reversed cell polarity.

[0061] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A lithium battery module polarity check tool, characterized by, include: The motherboard (10) is positioned on the battery module (100) via its bottom side; The probe (20) is mounted on the motherboard (10) and protrudes through the bottom and top sides of the motherboard (10), and corresponds to the detection point (101) of the cell in the battery module (100); as well as The detection module (30) is installed on the top side of the motherboard (10) and electrically connected to the probe (20). It is also electrically connected to the detection point (101) through the probe (20) to form a closed loop with the detection module (30).

2. The tooling of claim 1, wherein, The probes (20) corresponding to each detection point (101) are arranged in pairs at intervals, and the paired probes (20) are electrically connected by abutting the same detection point (101).

3. The tooling according to claim 2, characterized in that, It also includes wires (40) arranged on the top side of the motherboard (10) and connected between the unpaired probes (20) and between the probes (20) and the detection module (30).

4. The tooling of claim 3, wherein, The detection module (30) includes a power supply (31) and an alarm element (32). The alarm element (32) forms a closed loop through the wire (40), the probe (20), the detection point (101) and the power supply (31), and emits an audible and visual alarm.

5. The tooling of claim 1, wherein, The detection point (101) is a QR code mark on the battery cell casing, and the QR code mark on the battery cell is made of conductive material.

6. The tooling of claim 5, wherein, The battery cell casing is also provided with insulating paper (102), which covers the area on the battery cell casing other than the QR code marking.

7. The tooling of claim 5 wherein, The QR code marking on the battery cell casing is arranged opposite to the electrode post on the battery cell casing.

8. The tooling of claim 1 wherein, The motherboard (10) is provided with a positioning pin (11) on its bottom side, and the motherboard (10) matches the positioning hole on the battery module (100) through the positioning pin (11).

9. The tooling of claim 1 wherein, A limiting block (12) is provided on the bottom side of the motherboard (10). The limiting block (12) is arranged between the probes (20) of adjacent detection points (101), and the height of the limiting block (12) is less than the height of the probes (20).

10. The tooling of claim 1 wherein, A handle (13) is provided on the top side of the motherboard (10), and the handle (13) is located at both ends of the motherboard (10).

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