Battery protection plate size measuring auxiliary jig

Abstract

The utility model relates to a kind of battery protection plate external dimension measurement auxiliary jig, including base, positioning system and pressing mechanism;Positioning system has three fiducials fixed in base and three movable clamping positioning blocks, fiducial is used to from three-way positioning battery protection plate, and cooperate with clamping positioning block, limit in three vertical directions jointly;Pressing mechanism includes slidable pressing block and the magnet group providing pressing force for it, for the battery protection plate positioned to exert stable pressing force.The utility model provides a kind of battery protection plate external dimension measurement auxiliary jig, by innovative structural design, construct a positioning accurate, clamping stable measurement reference platform, to achieve highly repeatable and reliable measurement result in the detection process of battery protection plate, to meet the strict requirement of quality control in high-precision manufacturing field.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary equipment technology for testing in the battery manufacturing process, and more specifically, to an auxiliary fixture for measuring the external dimensions of a battery protection board. Background Technology

[0002] In the lithium-ion battery manufacturing industry, the battery protection board, as the core carrier of the battery management system, directly affects the assembly quality with battery modules, casings, and other components, as well as the safety performance of the final product, due to the accuracy of its physical dimensions. Currently, the auxiliary fixtures commonly used for dimensional inspection of battery protection boards on the production line often have structural limitations. These fixtures typically only provide preliminary support or unidirectional restraint, lacking a systematic constraint scheme for the position and orientation of the workpiece in three-dimensional space.

[0003] Specifically, common fixtures often struggle to establish stable and repeatable positioning references across three axes simultaneously. This results in the battery protection board still having slight slack in multiple directions after placement, meaning its six degrees of freedom in space are not effectively constrained. Furthermore, traditional clamping methods need improvement in adaptability to workpieces from different batches with slight dimensional variations; improper clamping force can lead to minor deformation or surface damage, while excessively loose clamping cannot effectively prevent workpiece position drift during measurement operations, especially when the fixture needs to be flipped to measure different surfaces. These factors collectively affect the accuracy and repeatability of dimensional measurement data, posing challenges to quality control and stability in the production process. Utility Model Content

[0004] In view of this, the present invention provides an auxiliary fixture for measuring the external dimensions of a battery protection board. Through innovative structural design, a precise positioning and stable clamping measurement reference platform is constructed, aiming to achieve highly repeatable and reliable measurement results during the inspection of battery protection boards, thereby meeting the stringent quality control requirements of the high-precision manufacturing field.

[0005] The objective of this utility model is achieved through the following technical solution: A battery protection board dimensional measurement auxiliary fixture includes a base, a positioning system, and a clamping mechanism. The positioning system is disposed on the base and includes three reference surfaces fixed to the base and three clamping positioning blocks. The three reference surfaces are used to position the battery protection board from three mutually perpendicular directions. The clamping positioning blocks are movably disposed on the base and cooperate with the reference surfaces to limit the battery protection board in the three mutually perpendicular directions. The clamping mechanism is disposed on the base and is used to apply a clamping force to the positioned battery protection board. The clamping mechanism includes a clamping block that slides along the base and a magnet assembly that provides clamping force to the clamping block. The magnet assembly includes a first magnet disposed on the clamping block and a second magnet disposed on the base.

[0006] This solution constructs a stable positioning and clamping system for the battery protection board through the coordinated design of the base, positioning system, and magnetic clamping mechanism. Three reference planes fixed to the base provide precise spatial references, which, combined with three movable positioning blocks, constrain the translational and rotational tendencies of the workpiece, achieving effective control of spatial degrees of freedom. The clamping mechanism uses a magnet assembly to generate a continuous and stable clamping force, resisting interference from vibration and attitude changes, ensuring that the workpiece and positioning system maintain close contact at all times. This design is easy to operate, provides good clamping consistency, and effectively guarantees the reproducibility and accuracy of multiple measurement results.

[0007] Preferably, four sets of magnets are provided, evenly distributed around the clamping block; wherein, two sets of magnets arranged opposite each other along the sliding direction of the clamping block form a first magnetic attraction pair, and the other two sets of magnets arranged opposite each other form a second magnetic attraction pair; the first magnetic attraction pair is configured to drive the clamping block to the clamping position and apply clamping force to the battery protection board when they are magnetically attracted to each other; the second magnetic attraction pair is configured to drive the clamping block to the release position away from the battery protection board when they are magnetically attracted to each other.

[0008] Four sets of magnets are evenly distributed around the clamping block. This symmetrical layout ensures balanced force distribution during sliding, resulting in smoother movement and maintaining parallel contact between the clamping block and the workpiece surface. This ensures uniform clamping force distribution and prevents localized deformation or stress concentration caused by excessive pressure on one side. Specifically, the four sets of magnets are clearly configured as two pairs of magnetic attraction pairs along the sliding direction, corresponding to the two distinct clamping and releasing positions. This provides a clear sense of control over the clamping mechanism. By selectively engaging specific magnetic pairs, the operator can easily and accurately drive and stabilize the clamping block in the desired position. Whether in the clamping or fully released state, positioning is maintained by magnetic attraction, enhancing operational intuitiveness and reliability. This design avoids the possibility of the clamping block being in an ambiguous intermediate position, ensuring stable clamping force at the clamping position and providing ample, interference-free space for workpiece placement and removal at the releasing position, simplifying the operation process.

[0009] Preferably, the clamping and positioning block is slidably connected to the base via a spring, and the spring force presses the battery protection plate.

[0010] The clamping and positioning block is slidably connected to the base via a spring, and the spring force provides continuous clamping force to the clamping and positioning block. This spring clamping mechanism has adaptive adjustment capability, which can compensate for dimensional tolerance fluctuations of the battery protection board to a certain extent. When there is a slight change in the size of the battery protection board, the spring compression will be adjusted accordingly, while the elastic force remains basically stable, thus ensuring relatively consistent clamping force for workpieces of different sizes. The spring clamping method has a buffering characteristic during clamping, avoiding damage to the surface or internal components of the battery protection board caused by rigid impacts.

[0011] Preferably, the base includes a separable base and a top cover, and the three reference surfaces are all disposed on the base; wherein two clamping and positioning blocks are disposed on the base and one clamping and positioning block is disposed on the top cover.

[0012] The base adopts a detachable base and top cover design, with all three reference surfaces set on the base, establishing a clear reference system. The base, as the primary reference platform, supports the workpiece's positioning reference, maintaining the consistency of the reference system. Two clamping and positioning blocks are located on the base, primarily responsible for the horizontal positioning and clamping of the battery protection board; one clamping and positioning block is located on the top cover, primarily responsible for vertical clamping and positioning. This distribution method conforms to the structural characteristics of the battery protection board, enabling complete constraint on the workpiece from different directions.

[0013] Preferably, the top cover and the base are detachably connected by multiple sets of connecting magnets.

[0014] The top cover and base are detachably connected via multiple sets of magnets, providing a convenient assembly and disassembly experience. The magnetic connection allows for tool-free separation and assembly of the top cover and base, simplifying the operation and improving work efficiency. The distribution of multiple sets of magnets creates a uniform attractive force between the top cover and base, ensuring a stable relative position when the two parts are joined, avoiding measurement errors caused by weak connections.

[0015] Preferably, four sets of connecting magnets are provided, located at the four corners of the upper cover.

[0016] Four sets of connecting magnets are located at the four corners of the top cover. This symmetrical arrangement creates a balanced magnetic force between the top cover and the base. The corner magnets generate a uniform attraction force across the entire area of ​​the top cover, preventing deformation or weak connections due to excessive or insufficient localized magnetic force. The four corner magnet support points form a stable support structure, similar to a four-corner support platform, which helps maintain the parallelism between the top cover and the base, preventing tilting of the mating surfaces.

[0017] Preferably, the surface of the clamping block acting on the battery protection board is provided with a non-rigid buffer layer.

[0018] A non-rigid buffer layer is incorporated into the surface of the battery protection board where the clamping block acts. This design improves the contact conditions between the clamping block and the workpiece. Made of an elastic material, the non-rigid buffer layer deforms moderately during clamping, resulting in a more uniform distribution of clamping force and preventing stress concentration. The elastic properties of the buffer layer absorb minor impacts during clamping, preventing indentations or scratches on the battery protection board surface.

[0019] Preferably, a buffer pad is provided on the clamping surface of the clamping positioning block.

[0020] A buffer pad is incorporated into the clamping surface of the clamping positioning block, enhancing the interface between the clamping surface and the battery protection board. Made of elastic material, the buffer pad cushions the contact between the clamping positioning block and the battery protection board, preventing damage from direct impact of hard materials onto the workpiece surface. Under pressure, the buffer pad undergoes slight deformation, increasing the actual contact area and resulting in a more uniform distribution of clamping force, reducing the risk of excessive localized stress.

[0021] Preferably, at least two of the three reference surfaces are integrally formed structures, and the base is provided with an observation window or a hollowed-out operation window.

[0022] At least two of the three reference surfaces employ a one-piece molding structure, a design that improves the positional accuracy between the reference surfaces. The one-piece molding, machined from the same material, eliminates assembly errors that occur when multiple independent reference surfaces are installed separately, ensuring high precision in the relative positional relationships between the reference surfaces, particularly in perpendicularity and intersection positions. The one-piece structure provides high mechanical rigidity and stability, better resisting internal stress and external impacts, and is less prone to deformation over long-term use, contributing to the long-term accuracy and stability of the reference system. Observation windows or perforated operation windows on the base allow operators to directly observe the positioning status of the battery protection board, or perform auxiliary operations (such as cleaning debris or adjusting position) through the perforated areas, enhancing the ease of use and maintainability of the fixture.

[0023] The advantages of this utility model compared to the prior art are: The auxiliary fixture for measuring the external dimensions of the battery protection board of this utility model exhibits many beneficial effects through its structural design: In terms of positioning accuracy and stability, three reference surfaces fixed to the base provide three relatively stable physical references in mutually perpendicular directions for the battery protection board. This structural design helps to establish a relatively clear spatial coordinate system. The movable clamping and positioning blocks work in conjunction with these fixed reference surfaces to clamp and limit the workpiece from relative directions. This combination of "fixed reference + movable clamping" can systematically limit the translation and rotation tendencies of the workpiece in space, keeping its position and orientation relatively stable during measurement, laying the foundation for obtaining measurement results with good repeatability.

[0024] In terms of operational efficiency and workpiece safety, the employed magnetic clamping mechanism achieves clamping through the magnetic attraction of magnets, simplifying the clamping operation. Simultaneously, magnetic clamping provides a relatively uniform clamping force, and combined with the non-rigid buffer layer design of the clamping block, the clamping force distribution is relatively gentle and even. This design helps reduce the possibility of damage to the delicate electronic components of the battery protection board or leaving indentations on its surface due to localized stress concentration, ensuring clamping reliability while also protecting the product.

[0025] In terms of structural rigidity and long-term reliability, the clamping and positioning blocks are slidably connected to the base via springs, providing adaptive clamping force. Furthermore, the optimized observation window or openwork operation window design on the base facilitates observation and operation while maintaining the structural rigidity of the fixture body, providing a relatively stable working platform for all positioning and clamping elements.

[0026] In terms of adaptability and protection, buffer pads are placed on the contact surfaces of the clamping and positioning blocks to further improve the interaction quality between the fixture and the workpiece. The buffer pads not only absorb minor impacts during contact and protect the workpiece surface, but their unique elastic deformation capacity can also adapt to minor dimensional fluctuations in the workpiece to a certain extent. Furthermore, by increasing the coefficient of friction, they enhance the anti-slip effect and improve the reliability of clamping. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a structural diagram of an auxiliary fixture for measuring the external dimensions of a battery protection board according to an embodiment of the present invention.

[0029] Figure 2 This is a partial structural diagram of an auxiliary fixture for measuring the external dimensions of a battery protection board according to an embodiment of the present invention.

[0030] Figure 3 This is a partial structural diagram of a battery protection board external dimension measuring auxiliary fixture according to an embodiment of the present invention, which further reduces the number of parts.

[0031] Figure 4 This is a partial exploded view of an auxiliary fixture for measuring the external dimensions of a battery protection board according to an embodiment of the present invention.

[0032] Labeling explanation: 1 base, 11 base, 12 top cover, 2 positioning system, 3 reference surface, 4 clamping positioning block, 5 pressing mechanism, 6 pressing block, 7 magnet group, 71 first magnet, 72 second magnet, 8 spring, 9 connecting magnet. Detailed Implementation

[0033] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0037] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0038] This embodiment provides an auxiliary fixture for measuring the external dimensions of a battery protection board, including: Base 1; Positioning system 2 is set on base 1. Positioning system 2 includes three reference surfaces 3 fixed to base 1 and three clamping positioning blocks 4. The three reference surfaces 3 are used to position the battery protection board from three mutually perpendicular directions respectively. The clamping positioning blocks 4 are movably set on base 1 and cooperate with the reference surfaces 3 to jointly limit the battery protection board in three mutually perpendicular directions. A clamping mechanism 5 is disposed on the base 1 and is used to apply clamping force to the positioned battery protection board. The clamping mechanism 5 includes a clamping block 6 that slides along the base 1 and a magnet assembly 7 that provides clamping force to the clamping block 6. The magnet assembly 7 includes a first magnet 71 disposed on the clamping block 6 and a second magnet 72 disposed on the base 1.

[0039] Through the collaborative design of the base 1, positioning system 2, and clamping mechanism 5, a systematic positioning and clamping scheme is constructed. Three reference surfaces 3 fixed to the base 1 provide three precise spatial references in mutually perpendicular directions for the battery protection board, ensuring a constant starting coordinate each time the workpiece is placed. Three movable clamping and positioning blocks 4 work in conjunction with these fixed reference surfaces 3, enabling active clamping and limiting of the battery protection board from different directions. This structural design effectively restricts the translational and rotational tendencies of the workpiece during measurement, constraining the spatial degrees of freedom of the battery protection board at the physical level and establishing reliable reference conditions for dimensional measurement. The clamping mechanism 5 uses a magnet assembly 7 to provide clamping force. Through the magnetic attraction between the first magnet 71 on the clamping block 6 and the second magnet 72 on the base 1, a continuous and stable clamping force is provided to the clamping block 6. This magnetic clamping method applies uniform clamping force after positioning, overcoming external interference such as vibrations and gravity changes caused by fixture flipping during measurement, ensuring that the battery protection board maintains close contact with the positioning system 2 throughout the entire measurement cycle. Magnetic clamping also features simple operation and stable clamping force, helping to maintain consistent clamping conditions. This design, integrating a stable reference, active limiting, and magnetic clamping, allows multiple measurements performed by different operators at different times to be completed under essentially consistent positioning and clamping conditions, helping to ensure the repeatability and consistency of measurement data. The entire fixture has a reasonable structural layout, with clearly defined functions for each component, collectively forming a complete auxiliary system for measuring the external dimensions of the battery protection board.

[0040] As attached Figure 3 As shown, the three reference planes 3 include a first reference plane, a second reference plane, and a third reference plane, which correspond to the three mutually perpendicular axes X, Y, and Z, respectively.

[0041] In this embodiment, four sets of magnet groups 7 are evenly distributed around the clamping block 6. Among them, two sets of magnet groups 7 arranged opposite each other along the sliding direction of the clamping block 6 form a first magnetic attraction pair, and the other two sets of magnet groups 7 arranged opposite each other form a second magnetic attraction pair. The first magnetic attraction pair is configured to drive the clamping block 6 to move to the clamping position and apply clamping force to the battery protection board when they are magnetically attracted to each other. The second magnetic attraction pair is configured to drive the clamping block 6 to move to the release position away from the battery protection board when they are magnetically attracted to each other.

[0042] Four sets of magnets are evenly distributed around the clamping block. This symmetrical layout ensures balanced force distribution during sliding, resulting in smoother movement and maintaining parallel contact between the clamping block and the workpiece surface. This ensures uniform clamping force distribution and prevents localized deformation or stress concentration caused by excessive pressure on one side. Specifically, the four sets of magnets are clearly configured as two pairs of magnetic attraction pairs along the sliding direction, corresponding to the two distinct clamping and releasing positions. This provides a clear sense of control over the clamping mechanism. By selectively engaging specific magnetic pairs, the operator can easily and accurately drive and stabilize the clamping block in the desired position. Whether in the clamping or fully released state, positioning is maintained by magnetic attraction, enhancing operational intuitiveness and reliability. This design avoids the possibility of the clamping block being in an ambiguous intermediate position, ensuring stable clamping force at the clamping position and providing ample, interference-free space for workpiece placement and removal at the releasing position, simplifying the operation process. When the clamping block needs to be moved to the clamping position, the operator pushes the clamping block to make the first magnetic pair magnetically attract each other; when it needs to be released, the operator pushes the clamping block to make the second magnetic pair magnetically attract each other.

[0043] In this embodiment, the clamping and positioning block 4 is slidably connected to the base 1 via the spring 8, and the battery protection plate is pressed tightly by the elastic force of the spring 8.

[0044] The clamping and positioning block 4 is slidably connected to the base 1 via a spring 8. The elastic force of the spring 8 provides a continuous clamping force to the clamping and positioning block 4. This spring 8 clamping mechanism has adaptive adjustment capability, which can compensate for the dimensional tolerance fluctuations of the battery protection board to a certain extent. When there is a slight change in the size of the battery protection board, the compression of the spring 8 will be adjusted accordingly, while the elastic force remains basically stable, thus ensuring that the clamping force for workpieces of different sizes is relatively consistent. The clamping method of the spring 8 has a buffering characteristic during the clamping process, avoiding damage to the surface or internal components of the battery protection board caused by rigid impact. The preload of the spring 8 can be adjusted according to the actual needs by selecting different specifications of spring 8 to control the clamping force within a suitable range, ensuring the reliability of clamping while preventing excessive clamping force from causing product deformation. This sliding connection structure of the spring 8 also features simple operation. When placing the workpiece, the clamping and positioning block 4 can be easily pushed open, and automatically returns to its original position after being released, improving operational efficiency. The continuous clamping force of the spring 8 also helps to eliminate the gap between the clamping and positioning block 4 and the battery protection board, ensuring that the workpiece maintains a stable position during measurement. The clamping and positioning block achieves self-adaptive positioning through slide rails and springs.

[0045] In this embodiment, the base 1 includes a separable base 11 and a top cover 12, and three reference surfaces 3 are all disposed on the base 11; wherein two clamping and positioning blocks 4 are disposed on the base 11 and one clamping and positioning block 4 is disposed on the top cover 12.

[0046] The base 1 adopts a detachable base 11 and top cover 12 design, with all three reference surfaces 3 set on the base 11. This layout establishes a clear reference system. The base 11, as the main reference platform, bears the positioning reference of the workpiece, maintaining the consistency of the reference system. Two clamping and positioning blocks 4 are set on the base 11, mainly responsible for the horizontal positioning and clamping of the battery protection board; one clamping and positioning block 4 is set on the top cover 12, mainly responsible for vertical clamping and positioning. This distribution method conforms to the structural characteristics of the battery protection board, enabling complete constraint on the workpiece from different directions. The detachable base 11 and top cover 12 design makes the maintenance and cleaning of the fixture more convenient. When it is necessary to clean accumulated dust or replace worn parts, the upper and lower parts can be easily separated. The split structure also provides the possibility of adapting to different types of battery protection boards. By replacing the top cover 12 with different reference surface 3 positions or adjusting the configuration of the clamping and positioning blocks 4, it can adapt to the measurement needs of various product specifications. The design of having the reference planes 3 centrally located on the base 11 helps maintain the stability of the reference system and avoids cumulative reference errors caused by structural separation.

[0047] A positioning pin or guide structure is provided next to the connecting magnet to ensure that the reference surfaces are aligned when the top cover and the base are repeatedly installed.

[0048] In this embodiment, the upper cover 12 and the base 11 are detachably connected by multiple sets of connecting magnets 9.

[0049] The upper cover 12 and the base 11 are detachably connected via multiple sets of connecting magnets 9, providing a convenient assembly and disassembly experience. The connecting magnets 9 allow for tool-free separation and assembly of the upper cover 12 and the base 11, simplifying operations and improving work efficiency. The distribution of multiple sets of connecting magnets 9 creates a uniform attraction force between the upper cover 12 and the base 11, ensuring a stable relative position when the two parts are joined, avoiding measurement errors caused by weak connections. The connecting magnets 9 also have a self-centering characteristic; when the upper cover 12 approaches the base 11, the magnetic force automatically guides both to the correct mating position, reducing assembly difficulty. Compared to mechanical snap-fit ​​or screw connections, the connecting magnets 9 reduce mechanical wear and maintain reliable connection performance even after long-term use. This detachable connection method facilitates the maintenance of the fixture and allows for easy replacement of different upper cover 12 components according to measurement needs.

[0050] In this embodiment, four sets of connecting magnets 9 are provided, located at the four corners of the upper cover 12.

[0051] Four sets of connecting magnets 9 are located at the four corners of the upper cover 12. This symmetrical layout creates a balanced magnetic force between the upper cover 12 and the base 11. The corner magnets 9 generate a uniform attraction force across the entire area of ​​the upper cover 12, preventing deformation or weak connection due to excessive or insufficient local magnetic force. The four corner magnet support points form a stable support structure, similar to a four-corner support platform, helping to maintain the parallelism between the upper cover 12 and the base 11 and preventing tilting of the mating surfaces. The symmetrical layout of the connecting magnets 9 also allows the upper cover 12 to be installed without directional restrictions, improving operational convenience. The configuration of four sets of connecting magnets 9 ensures connection reliability while also considering structural rationality, avoiding increased cost and structural complexity caused by too many connecting magnets 9. The corner magnets 9 are far from the working area of ​​the fixture, so they do not interfere with the placement and measurement of the battery protection board.

[0052] In this embodiment, the clamping block 6 has a non-rigid buffer layer on the surface of the battery protection board.

[0053] The clamping block 6 has a non-rigid buffer layer on its surface, which improves the contact conditions between the clamping block 6 and the workpiece. Made of an elastic material, the non-rigid buffer layer deforms moderately during clamping, resulting in a more uniform distribution of clamping force and preventing stress concentration. The elastic properties of the non-rigid buffer layer absorb minor impacts during clamping, preventing indentations or scratches on the battery protection board surface. The elastic material also has a high coefficient of friction, increasing the friction between the clamping block 6 and the workpiece surface, enhancing clamping stability, and preventing slippage of the workpiece during measurement. The non-rigid buffer layer protects coatings or markings on the battery protection board surface, preventing surface wear caused by repeated clamping. This design ensures reliable clamping while protecting the product's appearance and structure, making it particularly suitable for battery protection boards with precision components or easily damaged coatings.

[0054] In this embodiment, a buffer pad is provided on the clamping surface of the clamping positioning block 4.

[0055] A buffer pad is provided on the clamping surface of the clamping positioning block 4, a design that improves the friendliness of the contact interface between the clamping surface and the battery protection board. The buffer pad is made of elastic material, which acts as a buffer when the clamping positioning block 4 contacts the battery protection board, avoiding potential impact damage caused by direct impact of hard materials onto the workpiece surface. The buffer pad undergoes slight deformation under pressure, increasing the actual contact area and making the clamping force distribution more uniform, reducing the risk of excessive local stress. The buffering properties of the elastic material can also adapt to minor unevenness on the surface of the battery protection board, ensuring full contact between the clamping surface and the workpiece surface. The buffer pad material typically has a high coefficient of friction, which enhances the anti-slip ability of the clamping surface and provides additional anti-displacement protection for the battery protection board under vibration or flipping conditions. The buffer pad design also extends the service life of the clamping positioning block 4, reduces wear caused by long-term use, and maintains consistent clamping accuracy.

[0056] The non-rigid buffer layer is made of rubber or silicone, and the buffer pad is made of polyurethane or an elastic polymer.

[0057] In this embodiment, at least two of the three reference surfaces 3 are integrally formed structures, and the base 1 is provided with an observation window or a hollowed-out operation window.

[0058] At least two of the three reference surfaces 3 employ a one-piece molding structure, which improves the positional accuracy between the reference surfaces 3. The one-piece molding of the reference surfaces 3, processed from the same material, eliminates assembly errors caused by the separate installation of multiple independent reference surfaces 3, ensuring high precision in the relative positional relationship between the reference surfaces 3, especially in perpendicularity and intersection positions. The one-piece structure has high mechanical rigidity and stability, better resisting internal stress and external impacts, and is less prone to deformation over long-term use, contributing to the long-term accuracy and stability of the reference system. The observation window or perforated operation window on the base 1 allows the operator to directly observe the positioning status of the battery protection board, or perform auxiliary operations (such as cleaning debris or adjusting position) through the perforated area, improving the ease of use and maintainability of the fixture.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery protection plate outer dimension measurement auxiliary jig, characterized by, include: Base (1); A positioning system (2) is provided on the base (1). The positioning system (2) includes three reference surfaces (3) fixed to the base (1) and three clamping positioning blocks (4). The three reference surfaces (3) are used to position the battery protection board from three mutually perpendicular directions. The clamping positioning blocks (4) are movably provided on the base (1) and cooperate with the reference surfaces (3) to limit the battery protection board in three mutually perpendicular directions. A clamping mechanism (5) is disposed on the base (1) for applying clamping force to the positioned battery protection board; the clamping mechanism (5) includes a clamping block (6) that slides along the base (1) and a magnet assembly (7) that provides clamping force to the clamping block (6); the magnet assembly (7) includes a first magnet (71) disposed on the clamping block (6) and a second magnet (72) disposed on the base (1).

2. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, The magnet groups (7) are arranged in four groups and are evenly distributed around the pressing block (6); among them, two groups of magnet groups (7) arranged opposite each other along the sliding direction of the pressing block (6) constitute the first magnetic attraction pair, and the other two groups of magnet groups (7) arranged opposite each other constitute the second magnetic attraction pair; the first magnetic attraction pair is configured to drive the pressing block (6) to move to the pressing station and apply a pressing force to the battery protection board when they are magnetically attracted to each other; the second magnetic attraction pair is configured to drive the pressing block (6) to move to the release station away from the battery protection board when they are magnetically attracted to each other.

3. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, The clamping and positioning block (4) is slidably connected to the base (1) by a spring (8), and the battery protection plate is pressed by the elastic force of the spring (8).

4. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, The base (1) includes a separable base (11) and a top cover (12), and the three reference surfaces (3) are all disposed on the base (11); two clamping positioning blocks (4) are disposed on the base (11) and one clamping positioning block (4) is disposed on the top cover (12).

5. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 4, characterized in that, The top cover (12) and the base (11) are detachably connected by multiple sets of connecting magnets (9).

6. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 5, characterized in that, The connecting magnets (9) are arranged in four sets, located at the four corners of the upper cover (12).

7. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, The clamping block (6) has a non-rigid buffer layer on the surface of the battery protection board.

8. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, A buffer pad is provided on the clamping surface of the clamping positioning block (4).

9. The auxiliary fixture for measuring the external dimensions of the battery protection board according to claim 1, characterized in that, At least two of the three reference planes (3) are integrally formed structures.

10. The battery protection plate outline dimension measurement auxiliary jig according to claim 1, wherein The base (1) is provided with an observation window or a hollowed-out operation window.

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