A battery OCV detection fixture mechanism

Abstract

The present invention discloses a battery OCV detection fixture mechanism, including a first guide column arranged on a base plate, a first lifting assembly movably matched with the first guide column, and a test fixture arranged on the base plate, wherein a second guide column is movably matched with the first guide column, a second lifting assembly is arranged at the lower end of the second guide column, the top of the second guide column is connected to the fixed part of the driving unit, and the first lifting assembly is connected to the movable part of the driving unit. The test fixture is located between the two lifting assemblies, the movable part of the driving unit moves relative to the fixed part, the movable part drives the first lifting assembly to descend, the movable part reacts to the fixed part, the fixed part drives the second lifting assembly to rise, the two lifting assemblies act on a pair of clamping claws of the test fixture respectively, and the test fixture is opened. Compared with the prior art, the upper and lower lifting assemblies of the present invention open the test fixture at the same time, which is conducive to improving the efficiency of opening and closing the test fixture.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to battery OCV detection technology. Background Art

[0002] After the lithium battery is formed, divided into different capacities, and labeled, it needs to be subjected to an OCV (Open Circuit Voltage) test. The OCV test can be used to obtain the K value of the square lithium battery (the K value refers to the voltage drop of the battery per unit time, reflecting the self-discharge rate of the lithium battery), current, voltage, capacity and other parameters, so as to sort out lithium batteries with unqualified electrochemical parameters to ensure the quality of the finished battery.

[0003] In order to improve the detection efficiency, the opening and closing of the test fixture needs to be automatically realized in the OCV detection to realize automation, reduce labor and save costs. The patent document with the authorization announcement number CN 221007649U discloses a battery OCV detection automatic opening and closing fixture mechanism, including a base plate and a fixture assembly installed on the base plate, the fixture assembly includes a test fixture and a control assembly, the test fixture is installed on the base plate, and the control assembly converts the left and right lateral movement of the cylinder into vertical up and down movement through the movement of the cam bearing follower in a specific guide groove to realize the opening and closing of the test fixture.

[0004] Since one jaw of the test fixture is fixed on the bottom plate, the downwardly moving lower pressing shaft acts on the other jaw of the test fixture to open the test fixture. In this way, the lower pressing shaft needs a large upward and downward movement range to open and close the test fixture. Summary of the invention

[0005] The technical problem solved by the present invention is as follows: one jaw of the test fixture is fixed on the base plate, and the downwardly moving lower pressure shaft acts on the other jaw of the test fixture to open the test fixture. In this way, the lower pressure shaft needs a larger upward and downward movement range to open and close the test fixture, which is not conducive to improving the detection efficiency.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a battery OCV detection fixture mechanism, comprising a first guide column arranged on a base plate, a first lifting assembly movably cooperated with the first guide column, and a test fixture arranged on the base plate, the test fixture is located below the first lifting assembly, the descending first lifting assembly can act on the first clamping claw of the test fixture, the first guide column is hollow, a second guide column is movably cooperated with the first guide column, the second guide column protrudes downward from the base plate, a second lifting assembly is provided at the lower end of the second guide column, and the second lifting assembly can act upward on the second clamping claw of the test fixture; the first guide column protrudes upward from the top of the second guide column, a vertical plate is fixed to the top of the second guide column, the vertical plate is connected to the fixed part of the driving unit, the first lifting assembly is connected to the movable part of the driving unit, and the driving unit can drive the first lifting assembly to move downward.

[0007] According to the above technical solution, the movable part of the driving unit moves relative to the fixed part, the movable part drives the first lifting assembly to descend, the first lifting assembly acts downward on the first clamping claw of the test fixture, the reaction force of the first clamping claw on the first lifting assembly acts on the movable part of the driving unit, the movable part reacts on the fixed part of the driving unit, the fixed part drives the vertical plate to rise, the vertical plate drives the second guide column to rise, the second guide column drives the second lifting assembly to rise, and the second lifting assembly acts on the second clamping claw of the test fixture from bottom to top. Under the drive of the driving unit, the first lifting assembly and the second lifting assembly act on a pair of clamping claws of the test fixture respectively, the first clamping claw and the second clamping claw of the pair of clamping claws are balanced, and the test fixture is opened. The battery is positioned on the bottom plate, and the conductive connector of the battery is located in the opened test fixture. Afterwards, the movable part of the driving unit is reset, the first lifting assembly and the second lifting assembly are reset, the test fixture is closed, the conductive connector of the battery is clamped, and the power supply electrically connected to the test fixture supplies power to the battery to test the battery.

[0008] Compared with the prior art in which the lower pressure shaft only acts on one clamping jaw of the test fixture to open the test fixture, the upper and lower lifting assemblies of the present invention open the test fixture at the same time, which is conducive to improving the efficiency of opening and closing the test fixture. Moreover, the upper and lower clamping jaws of the test fixture of the present invention are subjected to force at the same time and the force is balanced, which is conducive to extending the service life of the test fixture.

[0009] Support feet are arranged at the four corners of the bottom surface of the bottom plate, and the support feet raise the bottom plate to provide sufficient space for the existence and lifting of the second lifting assembly.

[0010] The first lifting assembly includes a lifting seat, a lower pressing roller installed at the bottom of the lifting seat, first guide holes are provided at both ends of the lifting seat, the first guide holes cooperate with the first guide column, and a limit structure for limiting the maximum lifting range of the lifting seat is provided on the top of the first guide column. The lower pressing roller is pivotally connected to a pair of downward extending structures, and the lower pressing roller is in rolling contact with the first clamping jaw of the test fixture, which is conducive to reducing the friction between the lower pressing roller and the first clamping jaw, and further facilitates the lower pressing roller to smoothly press down the first clamping jaw.

[0011] The second lifting assembly includes a lifting plate fixedly connected to the bottom end of the second guide column, a lifting guide rod fixedly connected to the lifting plate, a second guide hole matched with the lifting guide rod is provided on the bottom plate, and an upper roller is installed at the top of the lifting guide rod, and the upper roller is located above the bottom plate and below the second clamping jaw. A pair of pivoting ears are fixed to the top of the lifting guide rod, and the two ends of the upper roller are pivotally connected to the pair of pivoting ears. The upper roller is in rolling contact with the second clamping jaw of the test fixture, which is conducive to reducing the friction between the upper roller and the second clamping jaw, and then facilitating the upper roller to smoothly push up the second clamping jaw to open the test fixture.

[0012] The hinge shaft of the test fixture is pivotally connected to the support ear, and the support ear is installed on the bottom plate. The pair of clamping jaws of the test fixture are hinged together through the hinge shaft. A torsion spring is sleeved on the hinge shaft. The two ends of the torsion spring are respectively pressed on the pair of clamping jaws. The tail of the pair of clamping jaws is located between the first lifting assembly and the second lifting assembly. Specifically, the lower pressure roller and the upper top roller move up and down towards each other, acting on the tail of the pair of clamping jaws. The pair of clamping jaws rotate around the hinge shaft to overcome the elastic force of the torsion spring. The front end of the pair of clamping jaws is opened to clamp the conductive connector of the battery.

[0013] The driving unit includes a horizontal cylinder, a transverse plate fixedly connected to the piston rod of the horizontal cylinder, an inclined track groove is provided on the transverse plate, a guide pin is matched in the track groove, and the guide pin is fixed on the first lifting assembly; the cylinder body of the horizontal cylinder is the fixed part of the driving unit, and the piston rod of the horizontal cylinder and the transverse plate are the movable parts of the driving unit. The piston rod of the horizontal cylinder extends, driving the transverse plate to move left, the track groove drives the guide pin to descend, and the guide pin drives the lifting seat and the lower pressure roller to descend. The lower pressure roller acts on the first clamping jaw to make the test fixture swing down, and the test fixture contacts the upper top roller. Under the action of the torsion spring, the test fixture has a reaction force on the lower pressure roller, and the reaction force makes the transverse plate and the vertical plate move upward. The vertical plate drives the second guide column to rise, and the second guide column drives the upper top roller to rise. Under the opposing forces of the lower pressure roller and the upper top roller, a pair of clamping jaws of the test fixture are opened.

[0014] The track groove includes an inclined groove and a horizontal groove connected end to end. When the guide pin moves along the inclined groove, the lower pressure roller and the upper top roller move toward each other to open the test fixture; when the guide pin enters the horizontal groove, the lower pressure roller and the upper top roller have opened the test fixture and are in a state of keeping the test fixture open.

[0015] A horizontal guide rail is installed on the vertical plate, a slider is matched on the horizontal guide rail, the slider is fixedly connected to the transverse plate, and the transverse plate is fixedly connected to the piston rod of the horizontal cylinder through a connecting piece.

[0016] The present invention uses the reaction force generated by the test fixture on the lower pressure shaft in the prior art to drive the upper top roller, so that the upper top roller cooperates with the lower pressure shaft (the lower pressure roller of the present invention) to open the test fixture. The present invention cleverly utilizes the reaction force generated by the detection fixture mechanism when it is working, which not only improves the efficiency of opening the test fixture, but also effectively saves energy for driving the detection fixture mechanism. Since the lifting stroke of the lower pressure shaft of the present invention is shortened, the present invention can use a smaller cylinder compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 A schematic diagram of a battery OCV detection fixture mechanism;

[0019] Figure 2 for Figure 1 Schematic diagram of the battery OCV detection fixture mechanism viewed from the rear;

[0020] Figure 3 This is the front view of the battery OCV detection fixture mechanism;

[0021] Figure 4 for Figure 3 Rear view of

[0022] Figure 5 for Figure 3 Right view of;

[0023] Figure 6 for Figure 3 Top view of the .

[0024] Explanation of symbols in the figure:

[0025] 10. Bottom plate;

[0026] 21. first guide column; 211. position limiting structure; 22. second guide column; 23. vertical plate;

[0027] 30. First lifting assembly; 31. Lifting seat; 32. Lower pressing roller; 33. Downward extending structure;

[0028] 40. Test fixture; 41. First clamping jaw; 42. Second clamping jaw; 43. Articulated shaft; 44. Supporting ear;

[0029] 50. Second lifting assembly; 51. Lifting plate; 52. Lifting guide rod; 53. Upper roller; 54. Pivot ear;

[0030] 60. Drive unit; 61. Horizontal cylinder; 62. Transverse plate; 620. Track groove; 621. Inclined groove; 622. Horizontal groove; 63. Guide pin; 64. Horizontal guide rail; 65. Connector. DETAILED DESCRIPTION

[0031] Combination Figure 1 , Figure 2 A battery OCV detection fixture mechanism includes a first guide column 21 arranged on a bottom plate 10, a first lifting assembly 30 movably matched with the first guide column, and a test fixture 40 arranged on the bottom plate, wherein the test fixture is located below the first lifting assembly, and the descending first lifting assembly can act on a first clamping claw 41 of the test fixture, the first guide column is hollow, a second guide column 22 is movably matched in the first guide column, the second guide column protrudes downward from the bottom plate, and a second lifting assembly 50 is provided at the lower end of the second guide column, and the second lifting assembly can act upward on a second clamping claw 42 of the test fixture;

[0032] The top of the second guide column protrudes upward from the first guide column. A vertical plate 23 is fixed to the top of the second guide column. The vertical plate is connected to the fixed part of the driving unit 60. The first lifting assembly is connected to the movable part of the driving unit. The driving unit can drive the first lifting assembly to move downward.

[0033] Support legs are provided at the four corners of the bottom surface of the bottom plate 10 , and the support legs raise the bottom plate to provide sufficient space for the existence and lifting of the second lifting assembly 50 .

[0034] The first lifting assembly 30 includes a lifting seat 31 and a lower pressure roller 32 installed at the bottom of the lifting seat. First guide holes are provided at both ends of the lifting seat. The first guide holes cooperate with the first guide columns 21. A limiting structure 211 is provided on the top of the first guide column to limit the maximum lifting range of the lifting seat.

[0035] The second lifting assembly 50 includes a lifting plate 51 fixedly connected to the bottom end of the second guide column 22, and a lifting guide rod 52 fixedly connected to the lifting plate. A second guide hole cooperating with the lifting guide rod is provided on the bottom plate 10. An upper roller 53 is installed at the top of the lifting guide rod. The upper roller is located above the bottom plate and below the second clamp 42.

[0036] The hinge shaft 43 of the test fixture 40 is pivotally connected to the support ear 44, and the support ear is installed on the base plate 10. The pair of clamping jaws of the test fixture are hinged together through the hinge shaft. A torsion spring is sleeved on the hinge shaft. The two ends of the torsion spring are respectively pressed against the pair of clamping jaws. The tail of the pair of clamping jaws is located between the first lifting assembly 30 and the second lifting assembly 50.

[0037] The driving unit 60 includes a horizontal cylinder 61 and a transverse plate 62 fixedly connected to the piston rod of the horizontal cylinder. The transverse plate is provided with an inclined track groove 620, in which a guide pin 63 is provided. The guide pin is fixed on the first lifting assembly 30. The cylinder body of the horizontal cylinder is the fixed part of the driving unit, and the piston rod and the transverse plate of the horizontal cylinder are the movable parts of the driving unit.

[0038] The track groove 620 includes an inclined groove 621 and a horizontal groove 622 connected end to end.

[0039] A horizontal guide rail 64 is installed on the vertical plate 23 , and a slider is matched on the horizontal guide rail. The slider is fixedly connected to the transverse plate 62 , and the transverse plate is fixedly connected to the piston rod of the horizontal cylinder 61 through a connecting piece 65 .

[0040] During operation, the piston rod of the horizontal cylinder 61 extends, driving the lateral plate 62 to move leftward, and the track groove 620 drives the guide pin 63 to descend, and the guide pin drives the lifting seat 31 and the lower pressure roller 32 to descend. The lower pressure roller acts on the first clamping jaw 41, causing the test fixture 40 to swing downward, and the test fixture contacts the upper top roller 53. Under the action of the torsion spring, the test fixture has a reaction force on the lower pressure roller 32, and the reaction force causes the lateral plate 62 and the vertical plate 23 to move upward. The vertical plate drives the second guide column 22 to rise, and the second guide column drives the upper top roller 53 to rise. Under the opposing forces of the lower pressure roller and the upper top roller, the tails of the first clamping jaw 41 and the second clamping jaw 42 of the test fixture are balanced, and a pair of clamping jaws rotate around the hinge shaft 43 to overcome the elastic force of the torsion spring, and the front ends of the pair of clamping jaws are opened. The battery is positioned on the bottom plate 10, and the conductive connector of the battery is located in the opened test fixture. Afterwards, the horizontal cylinder 61 is reset, the first lifting assembly 30 and the second lifting assembly 50 are reset, the test fixture 40 is closed, the conductive connector of the battery is clamped, and the power supply electrically connected to the test fixture supplies power to the battery to test the battery.

[0041] like Figure 3 The lower pressing roller 32 is pivotally connected to a pair of downward extending structures 33, and the lower pressing roller is in rolling contact with the first clamping jaw 41 of the test fixture, which is beneficial to reduce the friction between the lower pressing roller and the first clamping jaw, thereby facilitating the lower pressing roller to smoothly press down the first clamping jaw.

[0042] like Figure 2 A pair of pivoting ears 54 are fixed to the top of the lifting guide rod 52, and the two ends of the upper roller 53 are pivotally connected to the pair of pivoting ears. The upper roller is in rolling contact with the second clamping jaw 42 of the test fixture, which is conducive to reducing the friction between the upper roller and the second clamping jaw, thereby facilitating the upper roller to smoothly push up the second clamping jaw to open the test fixture 40.

[0043] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A battery OCV detection fixture mechanism, comprising a first guide post (21) arranged on a base plate (10), a first lifting assembly (30) movably matched with the first guide post, and a test fixture (40) arranged on the base plate, wherein the test fixture is located below the first lifting assembly, and the descending first lifting assembly can act on a first clamping claw (41) of the test fixture, characterized in that: The first guide column is hollow, a second guide column (22) is movably matched in the first guide column, the second guide column protrudes downward from the bottom plate, a second lifting assembly (50) is provided at the lower end of the second guide column, and the second lifting assembly can act upward on the second clamping claw (42) of the test fixture; The top of the second guide column protrudes upward from the first guide column, a vertical plate (23) is fixed to the top of the second guide column, the vertical plate is connected to the fixed part of the driving unit (60), the first lifting assembly is connected to the movable part of the driving unit, and the driving unit can drive the first lifting assembly to move downward.

2. The battery OCV detection fixture mechanism according to claim 1, characterized in that: The first lifting assembly (30) comprises a lifting seat (31) and a lower pressure roller (32) installed at the bottom of the lifting seat. First guide holes are provided at both ends of the lifting seat. The first guide holes cooperate with the first guide columns (21). A limit structure (211) is provided at the top of the first guide column for limiting the maximum lifting range of the lifting seat.

3. The battery OCV detection fixture mechanism according to claim 1, characterized in that: The second lifting assembly (50) comprises a lifting plate (51) fixedly connected to the bottom end of the second guide column (22), a lifting guide rod (52) fixedly connected to the lifting plate, a second guide hole matched with the lifting guide rod is provided on the bottom plate (10), and an upper roller (53) is installed at the top end of the lifting guide rod. The upper roller is located above the bottom plate and below the second clamping claw (42).

4. The battery OCV detection fixture mechanism according to claim 1, characterized in that: The hinge shaft (43) of the test fixture (40) is pivotally connected to the support ear (44), and the support ear is installed on the base plate (10). The pair of clamping jaws of the test fixture are hinged together through the hinge shaft. A torsion spring is sleeved on the hinge shaft. The two ends of the torsion spring are respectively pressed against the pair of clamping jaws. The tails of the pair of clamping jaws are located between the first lifting assembly (30) and the second lifting assembly (50).

5. The battery OCV detection fixture mechanism according to claim 1, characterized in that: The driving unit (60) comprises a horizontal cylinder (61), a transverse plate (62) fixedly connected to the piston rod of the horizontal cylinder, the transverse plate being provided with an inclined track groove (620), a guide pin (63) being matched in the track groove, and the guide pin being fixed on the first lifting assembly (30); the cylinder body of the horizontal cylinder is the fixed part of the driving unit, and the piston rod of the horizontal cylinder and the transverse plate are the movable parts of the driving unit.

6. The battery OCV detection fixture mechanism as claimed in claim 5, characterized in that: The track groove (620) includes an inclined groove (621) and a horizontal groove (622) connected end to end.

7. The battery OCV detection fixture mechanism as claimed in claim 5, characterized in that: A horizontal guide rail (64) is installed on the vertical plate (23), a slider is matched on the horizontal guide rail, the slider is fixedly connected to the transverse plate (62), and the transverse plate is fixedly connected to the piston rod of the horizontal cylinder (61) through a connecting piece (64).

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