On-line detection device for point bottom welding of all-tab battery

Abstract

The utility model discloses an on-line detection device for point bottom welding of a full-tab battery, and belongs to the technical field of lithium batteries. The utility model relates to a full-tab battery point bottom welding on-line detection device, which comprises a rotating unit, a fastening unit, a clamping unit and a tension measuring unit, wherein the fastening unit comprises a first base and a second base, the second base is connected to the first base in a sliding mode, the second base comprises symmetrically-sliding fixing discs, expansion needles and blocking strips are fixedly connected to the fixing discs, and the fixing discs are used for fixing a roll core of a battery; the device can achieve automatic control, is accurate and efficient, achieves accurate control of spot bottom welding quality, is accurate in detection result, and improves the quality of a battery.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an online detection device for spot bottom welding of full-tab batteries. Background Art

[0002] With the vigorous development of the new energy industry, lithium batteries are becoming one of the hottest industries at present. The market has higher and higher requirements for the performance of lithium batteries. In order to meet the market demand, various new technologies are emerging. Among them, full-tab batteries are becoming a new technology that many manufacturers are actively exploring. Full-tab batteries mean lower internal resistance. Compared with the internal resistance of ordinary cylindrical lithium batteries of about 20mΩ, the internal resistance of full-tab batteries is only about 3mΩ. The extremely low internal resistance brings excellent electrical performance to the battery.

[0003] For full-tab batteries, the current collector is flattened and welded to the current collecting plate, and then the current collecting plate and the steel shell are connected by spot bottom welding. As the negative electrode of the battery, the quality of the spot bottom welding will directly affect the internal resistance of the battery. However, for full-tab batteries, since there are no protruding tabs, there is no clamping position when measuring the spot bottom welding tension. The welding tension test becomes a difficult point, and it is also difficult to accurately monitor the welding quality. Utility Model Content

[0004] The utility model aims to solve the problems raised in the above-mentioned background technology and proposes an online detection device for spot bottom welding of a full-tab battery.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An online detection device for bottom welding of full-tab batteries, comprising: a rotating unit, a fastening unit, a clamping unit, and a tension measuring unit;

[0007] in

[0008] The fastening unit includes a first base and a second base, the second base is slidably connected to the first base, the second base includes a symmetrically sliding fixed disk, an expansion needle and a stop bar are fixedly connected to the fixed disk, and the fixed disk is used to fix the winding core of the battery;

[0009] The rotating unit comprises a motor, an output end of the motor is fixedly connected with a rotating needle, and the rotating needle is located between two expansion needles.

[0010] Preferably, the tension measurement unit has a built-in transfer cylinder and a tension sensor, the telescopic end of the transfer cylinder is fixedly connected to the first platform and the second platform, the motor is fixedly connected to the first platform, and the first base is fixedly connected to the second platform.

[0011] Preferably, the first base is provided with a central hole for the rotating needle and the expanding needle to pass through, and U-shaped slots are provided on both sides of the central hole. A slider is fixedly connected to the fixed plate, and the slider is slidably connected in the U-shaped slot.

[0012] Preferably, the outer arc of the fixed disk is concave, and the two sliding blocks are connected via an annular spring.

[0013] Preferably, the clamping unit comprises a clamping arm and a telescopic arm, and the clamping arm is used to clamp and fix the steel shell of the battery.

[0014] Compared with the prior art, the utility model provides an online detection device for spot bottom welding of full-tab batteries, which has the following beneficial effects:

[0015] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model can be automatically controlled, accurately and efficiently, and can achieve precise control of the quality of the spot bottom welding. The detection results are accurate, which improves the quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an online detection device for spot bottom welding of a full-tab battery proposed by the utility model;

[0017] Figure 2 It is a structural schematic diagram of a first base of an online detection device for spot bottom welding of a full-tab battery proposed by the utility model;

[0018] Figure 3 It is a structural schematic diagram of a fixing plate of an online detection device for spot bottom welding of a full-tab battery proposed by the utility model;

[0019] Figure 4 It is a structural schematic diagram of a rotating needle of an online detection device for spot bottom welding of a full-tab battery proposed by the utility model;

[0020] Figure 5 The utility model provides a structural schematic diagram of an expansion pin of an online detection device for bottom welding of a full-tab battery.

[0021] In the figure: 1. rotating unit; 2. fastening unit; 3. clamping unit; 4. tension measuring unit; 5. winding core; 6. steel shell; 11. motor; 12. first platform; 21. first base; 22. second base; 23. rotating needle; 24. annular spring; 25. second platform; 31. clamping arm; 32. telescopic arm; 211. U-shaped slot; 212. middle hole; 221. slider; 222. expansion needle; 223. fixed disk; 224. stop bar. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Embodiment 1:

[0024] Reference Figure 1-5 , an online detection device for bottom welding of full-tab battery, comprising: a rotating unit 1, a fastening unit 2, a clamping unit 3, and a tension measuring unit 4;

[0025] in

[0026] The fastening unit 2 includes a first base 21 and a second base 22. The second base 22 is slidably connected to the first base 21. The second base 22 includes a symmetrically sliding fixed disk 223. The fixed disk 223 is fixedly connected with an expansion needle 222 and a stop bar 224. The fixed disk 223 is used to fix the winding core 5 of the battery. Specifically, the fixed disk 223, the slider 221, the expansion needle 222, and the stop bar 224 are integrally formed and made of stainless steel. The outer arc surface of the expansion needle 222 is sprayed with glue or frosted to increase its surface friction, and the inner plane is polished or ceramic-plated to reduce its friction.

[0027] The rotating unit 1 includes a motor 11 , and a rotating needle 23 is fixedly connected to the output end of the motor 11 . The rotating needle 23 is located between two expansion needles 222 .

[0028] The tension measuring unit 4 has a transfer cylinder and a tension sensor built in. The telescopic end of the transfer cylinder is fixedly connected to the first platform 12 and the second platform 25 . The motor 11 is fixedly connected to the first platform 12 . The first base 21 is fixedly connected to the second platform 25 .

[0029] The first base 21 is provided with a central hole 212 for the rotating needle 23 and the expanding needle 222 to pass through, and two sides of the central hole 212 are provided with U-shaped slots 211 . The fixed plate 223 is fixedly connected with a slider 221 , and the slider 221 is slidably connected in the U-shaped slot 211 .

[0030] The outer arc of the fixing plate 223 is concave, and the two sliding blocks 221 are connected via an annular spring 24 .

[0031] The clamping unit 3 includes a clamping arm 31 and a telescopic arm 32, wherein the clamping arm 31 is used to clamp and fix the steel shell 6 of the battery;

[0032] When using the device, the spot-welded battery is first clamped to the position to be measured by the clamp arm 31 and the telescopic arm 32, and the steel shell 6 of the battery is clamped in and out by the clamp arm 31 and the telescopic arm 32. At this time, the displacement cylinder in the tension measurement unit 4 drives the rotating unit 1 on the first platform 12 and the fastening unit 2 on the second platform 25 to move downward as a whole, so that the expansion needle 222 and the rotating needle 23 are simultaneously inserted into the center hole of the battery coil core 5;

[0033] At this time, the motor 11 is started to drive the elliptical rotating needle 23 to rotate 90°. Figure 5 , the long axis end of the rotating needle 23 contacts the expansion needle 222, so that the outer arc of the expansion needle 222 tightly presses against the winding core 5, thereby fixing the winding core 5. At this time, the displacement cylinder moves upward, and the pressure sensor transmits the tension value in real time. When the requirement is met, the displacement cylinder moves downward back to the initial position, and the rotating needle 23 rotates 90°. For details, refer to Figure 4 At this time, the expansion needle 222 is not in contact with the rotating needle 23, and the expansion needle 222 and the winding core 5 are separated. At this time, the displacement cylinder drives the first platform 12 and the second platform 25 to reset, completing the tension test.

[0034] The utility model can automatically control, accurately and efficiently, realizes accurate control of the quality of spot bottom welding, and the detection result is accurate, thereby improving the quality of the battery.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An online detection device for bottom welding of full-tab batteries, characterized in that: include: A rotating unit (1), a fastening unit (2), a clamping unit (3), and a tension measuring unit (4); wherein The fastening unit (2) comprises a first base (21) and a second base (22), wherein the second base (22) is slidably connected to the first base (21), and the second base (22) comprises a symmetrically sliding fixed disk (223), an expansion needle (222) and a stop bar (224) are fixedly connected to the fixed disk (223), and the fixed disk (223) is used to fix the winding core (5) of the battery; The rotating unit (1) comprises a motor (11), the output end of the motor (11) is fixedly connected to a rotating needle (23), and the rotating needle (23) is located between two expansion needles (222).

2. The on-line detection device for bottom welding of full-tab batteries according to claim 1, characterized in that: The tension measurement unit (4) has a built-in transfer cylinder and a tension sensor, the telescopic end of the transfer cylinder is fixedly connected to a first platform (12) and a second platform (25), the motor (11) is fixedly connected to the first platform (12), and the first base (21) is fixedly connected to the second platform (25).

3. The on-line detection device for bottom welding of full-tab batteries according to claim 1, characterized in that: The first base (21) is provided with a central hole (212) for the rotating needle (23) and the expanding needle (222) to pass through, and U-shaped slots (211) are provided on both sides of the central hole (212). A sliding block (221) is fixedly connected to the fixed plate (223), and the sliding block (221) is slidably connected in the U-shaped slot (211).

4. The on-line detection device for bottom welding of full-tab batteries according to claim 3, characterized in that: The outer arc of the fixed disk (223) is concavely arranged, and the two sliding blocks (221) are connected via an annular spring (24).

5. The on-line detection device for bottom welding of full-tab batteries according to claim 1, characterized in that: The clamping unit (3) comprises a clamping arm (31) and a telescopic arm (32); the clamping arm (31) is used for clamping and fixing a steel shell (6) of a battery.

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