Button cell battery compression and detection device

Abstract

The utility model discloses a button cell pressure seal, detection equipment belongs to button cell assembly equipment technical field. It includes the open and close upper pressure head subassembly and lower pressure head subassembly, the upper pressure head subassembly includes insulating block and probe, and the probe is used for measuring button cell electric performance, the lower pressure head subassembly includes preassembly groove, and each structural layer of button cell is sequentially stacked into preassembly groove, and with the closure of upper pressure head subassembly and lower pressure head subassembly, the insulating block is pressed into preassembly groove, and the probe connects button cell, realizes button cell pressure seal and synchronous detection. Solve the problem that button cell pressure seal, detection process is incompatible currently, optimize button cell production process, reduce production cycle.

Description

Technical Field

[0001] This utility model belongs to the technical field of button battery assembly equipment, specifically relating to a button battery sealing and testing device. Background Technology

[0002] Existing button cells have the characteristics of simple structure, high specific capacity, high voltage, stable voltage output, long life, short assembly cycle and low cost. Therefore, laboratories often use button cells for electrical performance testing. After verifying the performance of the battery materials, they are then used in larger batteries such as pouch, prismatic, and cylindrical batteries.

[0003] Existing coin cells generally consist of a positive electrode shell, electrode sheets, separator, lithium foil, electrolyte, auxiliary materials (gaskets, springs, or nickel mesh), and a negative electrode shell. The coin cell manufacturing process includes assembly, battery testing, and battery packaging. The assembly process is further divided into stacking and pressing. Stacking involves sequentially placing the positive electrode shell, electrode sheets, electrolyte, separator, gaskets, springs, and negative electrode shell into an assembly fixture. Pressing involves pressing down on each layer of the stacked components in the assembly fixture to fuse them into a finished coin cell. For example, Chinese patent CN118231782A discloses an automatic coin cell assembly system, which includes an assembly device. The assembly device includes an assembly fixture and an assembly translation device that drives the assembly fixture to move. The movement trajectory of the assembly fixture passes through an electrolyte injection device and a pressing device.

[0004] Battery testing involves transferring the finished coin cell batteries to testing equipment after assembly for electrical performance testing. Existing coin cell assembly equipment lacks the capability to perform electrical performance testing simultaneously with the crimping process. Separating the assembly and testing processes extends the coin cell production line and prolongs the production cycle. Utility Model Content

[0005] This invention provides a button cell sealing and testing device to solve the problem of incompatibility between current button cell sealing and testing processes.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a button battery sealing and testing device, including an openable upper pressure head assembly and a lower pressure head assembly;

[0007] The upper pressure head assembly includes an insulating pressure block and a probe, the probe being used to measure the electrical performance of a coin cell battery;

[0008] The lower pressure head assembly includes a pre-assembly groove, in which the structural layers of the button cell are stacked sequentially. As the upper and lower pressure head assemblies close, the insulating block is pressed into the pre-assembly groove, and the probe is connected to the button cell to achieve pressing and sealing of the button cell and synchronous detection.

[0009] Specifically, the probe is built into an insulating block, and the probe can protrude from the end face of the insulating block facing the pre-assembly groove.

[0010] Specifically, the upper pressure head assembly further includes an insulating mounting block, which is detachably and fixedly connected to the insulating pressure block.

[0011] Specifically, the upper pressure head assembly also includes an upper mold base sleeved on the outside of the insulating mounting block and the insulating pressure block.

[0012] Specifically, the lower pressure head assembly includes a lower pressure head, an elastic element and a positioning sleeve that are sequentially sleeved on the outside of the lower pressure head from bottom to top, and a lower mold base. One end of the elastic element is connected to the positioning sleeve, and the other end is connected to the lower mold base. The inner wall of the positioning sleeve forms a pre-assembly groove with the top surface of the lower pressure head. As the upper pressure head assembly and the lower pressure head assembly close, the upper mold base presses down on the positioning sleeve.

[0013] Specifically, it also includes a pressure sensor for detecting the pressure exerted on the button cell by the closure of the upper and lower pressure head assemblies.

[0014] Specifically, it also includes a power assembly for driving the opening and closing of the upper pressure head assembly and the lower pressure head assembly.

[0015] Specifically, the power assembly includes a servo motor and a ball screw that converts the rotational motion of the servo motor into linear motion.

[0016] Specifically, it also includes a guide structure for constraining the direction of movement of the lower pressure head assembly relative to the upper pressure head assembly.

[0017] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0018] By integrating the probe and insulating block into the upper pressure head assembly, the button cell can be sealed. The probe can also measure the resistance and open-circuit voltage of the button cell to complete the testing of the button cell. No testing equipment is required, which reduces costs. The button cell does not need to be transferred or repositioned between the sealing and testing processes, which optimizes the button cell production process and shortens the production cycle. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the button battery sealing and testing equipment in this utility model embodiment;

[0020] Figure 2 This is a bottom view of the button battery sealing and testing equipment in this embodiment of the utility model;

[0021] Figure 3 This is a top view of the button battery sealing and testing equipment in this utility model embodiment;

[0022] Figure 4 This is a utility model Figure 3 Sectional view along line AA;

[0023] Figure 5 This is a structural diagram of the upper pressure head assembly and the lower pressure head assembly of this utility model.

[0024] As shown in the figure:

[0025] 10. Upper pressure head assembly; 11. Insulating pressure block; 12. Probe; 13. Insulating mounting block; 14. Upper mold base; 15. Connecting plate; 20. Lower pressure head assembly; 21. Lower mold base; 22. Lower pressure head; 23. Elastic element; 24. Positioning sleeve; 25. Lower mold sleeve; 30. Servo motor; 31. Reducer; 32. Coupling; 33. Small helical gear; 34. Large helical gear; 35. Coupling sleeve; 36. Shaft sleeve; 37. Bearing; 38. Nut; 39. Screw; 40. Upper fixing plate; 50. Middle fixing plate; 60. Lower fixing plate; 70. Guide column; 71. Linear bearing; 80. Pressure sensor. Detailed Implementation

[0026] For ease of understanding, the button cell sealing and testing equipment is described below with reference to embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1As shown, the button cell sealing and testing equipment in this embodiment includes an upper pressure head assembly 10, a lower pressure head assembly 20, a power assembly, and an upper fixing plate 40, a middle fixing plate 50, and a lower fixing plate 60 arranged sequentially from top to bottom. The upper pressure head assembly 10 is mounted on the lower surface of the upper fixing plate 40, the lower pressure head assembly 20 is mounted on the upper surface of the middle fixing plate 50, and the power assembly is mounted on the lower fixing plate 60. The power assembly drives the middle fixing plate 50 to move upward or downward relative to the upper fixing plate 40, thereby opening and closing the upper pressure head assembly 10 and the lower pressure head assembly 20.

[0030] like Figure 1 As shown, a guide structure is provided between the upper fixed plate 40 and the lower fixed plate 60. The guide structure includes a guide post 70 and a linear bearing 71 with a square flange. The linear bearing 71 is sleeved on the outer periphery of the guide post 70 and passes through the middle fixed plate 50. The square flange is fixedly connected to the middle fixed plate 50 by bolts. When the power assembly drives the middle fixed plate 50 to move, the guide structure constrains the movement direction of the middle fixed plate 50, ensuring that the middle fixed plate 50 can only move upward or downward along the guide post 70. That is, it constrains the lower pressure head assembly 20 to move linearly relative to the upper pressure head assembly 10 in the opening and closing directions of both.

[0031] like Figure 2 and Figure 4 As shown, the power assembly includes a servo motor 30, a reducer 31, a coupling 32, a small helical gear 33, a large helical gear 34, a coupling sleeve 35, a bushing 36, bearings 37, and a ball screw. The ball screw converts the rotational motion of the servo motor 30 into linear motion. The ball screw includes a nut 38 and a screw 39. The output end of the servo motor 30 is connected to the reducer 31. The output end of the reducer 31 is fixedly connected to the small helical gear 33 via the coupling 32. The small helical gear 33 meshes with the large helical gear 34. The large helical gear 34 is fixedly connected to the nut 38 via the coupling sleeve 35. The nut 38 is threaded onto the screw 39. The top of the screw 39 is fixedly connected to a middle fixing plate 50. A bushing 36 is fitted over the coupling sleeve 35, and several bearings 37 are disposed between them. The bushing 36 and the coupling sleeve 35 can rotate relative to each other. The bushing 36 is fixed to the lower fixing plate 60.

[0032] like Figure 2 and Figure 4 As shown, the working principle of the power assembly is as follows: the servo motor 30 drives the reducer 31 to operate and output rotational power. The rotational power is transmitted sequentially to the coupling 32, the small helical gear 33, the large helical gear 34 and the coupling sleeve 35. Since the nut 38 is embedded in the coupling sleeve 35, the rotation of the large helical gear 34 drives the coupling sleeve 35 to rotate, and the coupling sleeve 35 drives the nut 38 to rotate. The screw 39 in the nut 38 moves linearly in the vertical direction, and the fixed plate 50 moves synchronously in the drive. The upper pressure head assembly 10 and the lower pressure head assembly 20 open and close in the vertical direction.

[0033] like Figures 2 to 5 As shown, the upper pressure head assembly 10 includes an insulating pressure block 11, a probe 12, an insulating mounting block 13, an upper mold base 14, and a connecting plate 15. A pressure sensor 80 is bolted to the lower surface of the upper fixing plate 40. The lower surface of the pressure sensor 80 is bolted to the connecting plate 15, and the lower surface of the connecting plate 15 is bolted to the upper mold base 14, which is sleeved around the insulating mounting block 13 and the insulating pressure block 11. When the insulating pressure block 11 is compressed, the pressure is transmitted to the pressure sensor 80, which detects the pressure applied to the button cell by the closing of the upper pressure head assembly 10 and the lower pressure head assembly 20.

[0034] Continue as Figure 2 and Figure 5 As shown, the upper fixing plate 40, pressure sensor 80, connecting plate 15, upper mold base 14, insulating mounting block 13, and insulating pressure block 11 are all provided with through holes for the circuit to pass through. The probe 12 is connected to the circuit, which is used to transmit the detected resistance and open-circuit voltage information. The probe 12 is built into the through hole of the insulating pressure block 11, and the lower end of the probe 12 can protrude from the through hole, so that the lower end of the probe 12 protrudes from the end face of the insulating pressure block 11 facing the pre-assembly groove, ensuring that the probe 12 can contact the button cell battery to realize the detection of resistance and open-circuit voltage. The upper end of the insulating pressure block 11 is provided with threads, and the middle of the insulating mounting block 13 is provided with a screw hole. The insulating pressure block 11 is screwed onto the insulating mounting block 13 by the threads. By rotating the insulating pressure block 11, the insulating pressure block 11 can be installed onto the insulating mounting block 13, and by rotating the insulating pressure block 11 in the opposite direction, the insulating pressure block 11 can be removed from the insulating mounting block 13.

[0035] Continue as Figure 2 and Figure 5 As shown, the lower pressure head assembly 20 includes a lower mold base 21, a lower pressure head 22, an elastic element 23, a positioning sleeve 24, and a lower mold sleeve 25. The lower mold base 21 is fixedly mounted on the upper surface of the middle fixing plate 50 by bolts. The lower pressure head 22 is fixedly mounted in the middle of the lower mold base 21. There is a gap between the upper end of the lower pressure head 22 and the upper end of the lower mold base 21. This gap is used to accommodate the elastic element 23 and the positioning sleeve 24. The elastic element 23 and the positioning sleeve 24 are sleeved on the outside of the lower pressure head 22. The elastic element 23 is a spring, with its lower end connected to the lower mold base 21 and its upper end connected to the positioning sleeve 24. The lower mold sleeve 25 is sleeved on the outside of the lower mold base 21. The lower mold sleeve 25 is used to limit the upward movement distance of the positioning sleeve 24, ensuring that the positioning sleeve 24 does not completely detach from the lower pressure head 22. The inner wall of the positioning sleeve 24 forms a pre-assembly groove with the top surface of the lower pressure head 22. As the upper pressure head assembly 10 and the lower pressure head assembly 20 close, the upper mold base 14 presses down the positioning sleeve 24, and the insulating pressure block 11 is pressed into the pre-assembly groove.

[0036] like Figure 3 and Figure 5As shown, the working principle of button cell sealing and testing is as follows: the positive electrode shell, electrode sheet, electrolyte, separator, lithium sheet, gasket, spring sheet, and negative electrode shell are sequentially stacked in the pre-assembly slot; the power unit drives the lower pressure head assembly 20 to rise until the upper pressure head assembly 10 touches the insulating pressure block 11, and the pressure value displayed by the pressure sensor 80 reaches the preset pressure value, completing the sealing of the button cell. During the sealing process, the probe 12 inside the insulating pressure block 11 simultaneously tests the resistance and open-circuit voltage of the button cell, and judges whether the button cell is qualified from the resistance value and open-circuit voltage value. After the resistance and open-circuit voltage are measured, the lower pressure head assembly 20 descends, completing the sealing and testing of the button cell.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A button cell sealing and testing device, characterized in that, Includes an openable upper pressure head assembly and a lower pressure head assembly; The upper pressure head assembly includes an insulating pressure block and a probe, the probe being used to measure the electrical performance of a coin cell battery; The lower pressure head assembly includes a pre-assembly groove, in which the structural layers of the button cell are stacked sequentially. As the upper and lower pressure head assemblies close, the insulating block is pressed into the pre-assembly groove, and the probe is connected to the button cell to achieve pressing and sealing of the button cell and synchronous detection.

2. The button cell sealing and testing equipment as described in claim 1, characterized in that, The probe is built into the insulating block and can protrude from the end face of the insulating block facing the pre-assembly groove.

3. The button cell sealing and testing equipment as described in claim 2, characterized in that, The upper pressure head assembly also includes an insulating mounting block, which is detachably and fixedly connected to the insulating pressure block.

4. The button cell sealing and testing equipment as described in claim 3, characterized in that, The upper pressure head assembly also includes an upper mold base sleeved on the outside of the insulating mounting block and the insulating pressure block.

5. The button cell sealing and testing equipment as described in claim 4, characterized in that, The lower pressure head assembly includes a lower pressure head, an elastic element and a positioning sleeve that are sequentially sleeved on the outside of the lower pressure head, and a lower mold base. One end of the elastic element is connected to the positioning sleeve, and the other end is connected to the lower mold base. The inner wall of the positioning sleeve forms a pre-assembly groove with the top surface of the lower pressure head. As the upper pressure head assembly and the lower pressure head assembly close, the upper mold base presses down on the positioning sleeve.

6. The button cell sealing and testing equipment as described in claim 1, characterized in that, It also includes a pressure sensor for detecting the pressure exerted on the button cell by the closure of the upper and lower pressure head assemblies.

7. The button cell sealing and testing equipment as described in claim 1, characterized in that, It also includes a power assembly for driving the opening and closing of the upper pressure head assembly and the lower pressure head assembly.

8. The button cell sealing and testing equipment as described in claim 7, characterized in that, The power assembly includes a servo motor and a ball screw that converts the rotational motion of the servo motor into linear motion.

9. The button cell sealing and testing equipment as described in claim 1, characterized in that, It also includes a guide structure, which is used to constrain the direction of movement of the lower pressure head assembly relative to the upper pressure head assembly.

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