Battery processing method and square shell power battery top cover welding clamp

Abstract

The invention provides a battery processing method and a square-shell power battery top cover welding fixture, belongs to the technical field of battery processing, and provides a square-shell power battery top cover welding fixture and steps used for the battery processing method.The square-shell power battery top cover welding fixture comprises a fixture bottom plate used for positioning a top cover and protecting the top cover from being polluted by welding slag during welding; the fastening mechanism is used for downwards fastening the aluminum shell of the battery to prevent the top cover and the aluminum shell from being opened by an internal roll core, so that cold solder joint caused by the change of the assembly relation between the aluminum shell and the top cover during welding is avoided; and the locking mechanism is used for controlling opening and closing of the fastening mechanism so as to unlock and fix the battery. The problem that the welding slag pollutes the battery top cover in production can be solved on the premise that the equipment stability is not reduced and the equipment cost is not increased.

Description

Technical Field

[0001] The invention belongs to the technical field of battery processing, in particular to a battery processing method and a square shell power battery top cover welding fixture. Background Art

[0002] When welding the top cover of existing square shell power batteries, the battery is positioned with the top cover facing up in the fixture. This positioning method will bring two disadvantages. The first is that the high-temperature welding slag generated during welding will splash onto the top cover and pollute the top cover. Although there are also equipment that installs a protective cover for the battery top cover before welding to prevent the welding slag from polluting the top cover, it will cause the disadvantages of complex equipment, high cost, and reduced stability; the second is that before welding the top cover, since the battery generally has a process of moving or rotating, in order to prevent the top cover and the aluminum shell from shifting, it is necessary to add a pre-welding process. First, the battery top cover and the aluminum shell are pre-welded and fixed, and then placed in the top cover welding fixture for top cover welding. Otherwise, the winding core inside the battery may stretch the top cover to destroy the assembly relationship between the battery top cover and the aluminum shell before welding, resulting in a false weld when welding the top cover. Summary of the invention

[0003] In order to solve the technical problems in the prior art that the welding process is complicated and the welding slag is easy to contaminate the top cover, a battery processing method is proposed, including: Step S1, the top of the aluminum shell of the battery is pressed down and limited by a fastening mechanism; the side of the aluminum shell of the battery is limited by a limiting portion; the top cover at the bottom of the battery is limited by a clamp bottom plate of a clamp, and the locking mechanism is provided with a fastening mechanism and the limiting portion; Step S2, while positioning, detecting the distance between the aluminum shell and the top cover by a detection mechanism to determine whether the distance is less than a preset distance; Step S3, if yes, the assembled object to be welded is obtained; if no, the aluminum shell is pressed downward by the fastening mechanism until the distance between the aluminum shell and the top cover is less than the preset distance; Step S4, welding the object to be welded by welding equipment; Step S5, after welding is completed, the fastening mechanism and the limiting portion move in a direction away from the battery.

[0004] A square shell power battery top cover welding fixture is proposed, which is used in the steps of the above-mentioned battery processing method, including: A fixture bottom plate, used for positioning the top cover and protecting the top cover from contamination by welding slag during welding; A fastening mechanism, used to fasten the aluminum shell of the battery downward to prevent the internal winding core from spreading the top cover and the aluminum shell apart, causing a change in the assembly relationship between the aluminum shell and the top cover during welding and causing a cold weld; The locking mechanism is used to control the opening and closing of the fastening mechanism to unlock and fix the battery.

[0005] Optionally, the fastening mechanism is provided with a first fastening portion and a second fastening portion having the same structure as the first fastening portion; The battery is placed between the first fastening portion and the second fastening portion, and both are used to fasten the aluminum shell on the top of the battery downward to prevent the winding core inside the battery from opening the top cover and the aluminum shell; The first fastening portion is provided with a first cam mounting seat and a second cam mounting seat with the same structure as the first cam mounting seat; the first cam mounting seat is provided with an arc-shaped through hole at one end close to the battery, and the other end is connected to the slider of the first linear guide rail; a connecting rod base is provided between the first cam mounting seat and the second cam mounting seat, one end of the connecting rod base is close to the slide rail of the first linear guide rail, and the end close to the battery is provided with a pressure rod; a mounting hole is provided on each side of the pressure rod, and the mounting hole is used to connect the first cam bearing follower and the second cam bearing follower; the connecting rod base is away from the first A through hole is provided at the other end of a linear guide rail; the through hole is located between the two mounting holes, and the through hole is connected to the two mounting holes via a rotating shaft; the raised end of the first cam bearing follower is placed in the arc-shaped through hole, and can move along the arc-shaped through hole under the action of a driving member; a second linear guide rail is installed on the left side of the connecting rod base, and a third linear guide rail is installed on the right side; the sliders of the second linear guide rail and the third linear guide rail are both located on the outside, the outside of the slider is connected to the inside of the concave plate, the slide rail is located on the inside, and the inside of the slide rail is placed in the slot hole of the connecting rod base.

[0006] Optionally, a vertical U-shaped slot is provided on the outer side of the connecting rod base, a second cam bearing follower is installed on the inner side of the first cam mounting seat, and a raised end of the second cam bearing follower is placed in the U-shaped slot.

[0007] Optionally, two first clamping plates are provided in the locking mechanism, and the outer sides of the second linear guide and the third linear guide are each connected to a first clamping plate, the front side of the first clamping plate is connected to the rear side of the concave plate, and the inner sides of the two first clamping plates are respectively connected to the outer sides of the slider of the second linear guide and the slider of the third linear guide.

[0008] Optionally, a mounting hole is provided in the first clamping plate near the third linear guide; a fourth linear guide is installed below the first linear guide, the slide rail of the fourth linear guide is installed on the connecting rod base, a second clamping plate is installed on the slider of the fourth linear guide near the outer side, a first rotating axis is installed on the second clamping plate, and the first rotating axis is used to install the connecting rod on the second clamping plate; the other end of the connecting rod is connected to the rear position of the first clamping plate through the second rotating axis.

[0009] Optionally, a height conversion block is provided at the bottom of the connecting rod base, and a laser baffle is installed on a side of the height conversion block close to the battery.

[0010] Optionally, the bottom of the height change block is mounted on the fixture bottom plate.

[0011] Optionally, a battery card board is provided on the outer side of the concave plate, and one end of the battery card board close to the battery is a card slot, and one side of the battery can be placed in the card slot of the battery card board.

[0012] The battery is provided with a top cover and an aluminum shell, and the fixture bottom plate is used for supporting and protecting the top cover.

[0013] After the aluminum shell and the top cover are assembled, the locking mechanism controls the fastening mechanism to press the aluminum shell downward to prevent the winding core inside the battery from spreading the top cover and the aluminum shell.

[0014] Optionally, after the top cover and the aluminum shell are welded, the fastening mechanism is lifted by a locking mechanism to facilitate removal of the battery from the fastening mechanism.

[0015] Beneficial effects of the present invention: The square shell power battery top cover welding fixture is used in the square shell power battery top cover and aluminum shell welding production equipment, which can solve the problem of welding slag contaminating the battery top cover during production without reducing the equipment stability and increasing the equipment cost. At the same time, it can also eliminate a pre-welding process, reduce the number of equipment for lithium-ion battery production, and reduce equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention after placing batteries; Figure 3 Another schematic diagram of the overall structure of the present invention after placing batteries; Figure 4 It is a partial structural schematic diagram of the present invention; Figure 5 It is another partial structural schematic diagram of the present invention; Figure 6 It is a schematic diagram of the compression rod structure of the present invention; Figure 7 It is a schematic diagram of the local structure of the pressure rod of the present invention; Figure 8 This is a schematic diagram of the connecting rod base structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the first cam mounting seat of the present invention; Fig.10 It is a schematic diagram of the overall structure of the present invention at one angle. DETAILED DESCRIPTION

[0017] In the prior art, the top cover 400 and the aluminum shell 500 are first welded together by spot welding or pre-welding, and the welding process is relatively complicated. In the present embodiment, after the top cover 400 and the aluminum shell 500 are positioned, the effect of "pre-welding + full welding" in the prior art can be achieved only by "full welding".

[0018] In the past, pre-welding was required before full welding. There are two main reasons for this. First, when placing the battery in the welding station, it is necessary to move the battery to the welding station. During the transportation process, the position of the top cover 400 and the aluminum shell 500 is prone to change, which is prone to cold welding or miswelding. Second, after welding the front, the battery needs to be rotated 180° when welding the back. For example, if the battery is rotated by a DD motor and there is no pre-welding fixation process, the battery is prone to bending and deformation during twisting. The above-mentioned methods in the past have the following defects. First, during welding, the flying welding slag will contaminate the top cover. Second, the battery is prone to bending and deformation during twisting.

[0019] The technical solution has two advantages. First, before the battery enters the fixture, its position is stationary relative to the movable fixture, so the pre-welding process can be omitted and full welding can be performed directly. That is, the prior art is to transport the pre-welded battery to the welding station and then weld it, while the technical solution is to position the battery by the fixture and then directly weld it. Second, when the battery is transported to the fixture by a tool such as a loading robot, the position of the top cover 400 and the aluminum shell 500 may change during the transportation process. However, since the technical method adopts 3D camera detection technology, even if the position changes, the relative position between the top cover 400 and the aluminum shell 500 can still be adjusted by the second drive member, thereby achieving the purpose of preventing cold welding. The second drive member can be any component that adjusts the relative position between the fixture and the battery, such as a loading robot or a cylinder. In addition, in the prior art, after welding is completed, an additional transport mechanism is required to grab and transport the battery to the position of the next process. However, the present technical solution is to transport the welded battery to the target position through the second driving member of the fixture. The present technical solution has the functions of positioning, welding, and transporting. The positioning method of the battery in the fixture is changed from the existing upward or sideways placement to downward placement through the fixture. The fixture bottom plate 100 is used to cover the top cover 400 of the battery, and only the edge required for welding is reserved to prevent welding slag from contaminating the top cover 400 during welding. The fixture bottom plate 100 is a fixed part of the fixture and does not need to be specially installed on the battery before welding, which ensures the stability of the equipment, simplifies the equipment, and reduces the equipment cost. At the same time, there is a special fastening mechanism 200 on the upper part of the fixture to fasten the aluminum shell 500 of the battery on the top cover 400 to prevent the internal winding core of the battery from opening the top cover 400 and the aluminum shell 500, causing the assembly relationship between the aluminum shell and the top cover to change during welding, causing a cold weld, thereby eliminating the pre-welding process before the top cover is welded.

[0020] Reference Figures 1 to 10 In this embodiment, if the internal winding core of the battery opens the top cover 400 and the aluminum shell 500, the assembly relationship between the aluminum shell 500 and the top cover 400 will change during welding, thereby causing cold welding.

[0021] Reference Fig. 9 A first cam mounting seat 1 and a second cam mounting seat are installed on both sides of the connecting rod base 4. Slot holes 9 are opened on both sides of the connecting rod base 4. The first cam mounting seat 1 and the second cam mounting seat can move up and down along the U-shaped slot hole 9 under the action of external force.

[0022] Reference Figure 4 and Fig.10When welding the edges where the bottom top cover 400 and the aluminum shell 500 are in contact, the front edges can be welded by the first laser device, and the rear edges can be welded by the second laser device. Since the first laser device and the second laser device are in a facing relationship, it is easy to cause welding equipment failure. The laser baffle 17 can block the opposite laser, thereby achieving the purpose of protecting the laser device.

[0023] Reference Figures 1 to 10 In one embodiment, a battery processing method is provided, comprising: Step S1, the top of the aluminum shell 500 of the battery is pressed down and limited by the fastening mechanism 200; the side of the aluminum shell 500 of the battery is limited by the limiting part; the top cover 400 at the bottom of the battery is limited by the clamp bottom plate 100 of the clamp, and the fastening mechanism 200 and the limiting part are provided in the locking mechanism 300; Step S2, while positioning, detecting the distance between the aluminum shell 500 and the top cover 400 through a detection mechanism to determine whether the distance is less than a preset distance; Step S3, if yes, the assembled object to be welded is obtained; if no, the aluminum shell 500 is pressed downward by the fastening mechanism 200 until the distance between the aluminum shell 500 and the top cover 400 is less than the preset distance; Step S4, welding the object to be welded by means of welding equipment; Step S5, after welding is completed, the fastening mechanism 200 and the limiting portion move in a direction away from the battery.

[0024] In one embodiment, a square shell power battery top cover welding fixture is provided, which is used to perform the steps of the above-mentioned battery processing method, including: The fixture bottom plate 100 is used to position the top cover 400 and protect the top cover 400 from being contaminated by welding slag during welding; The fastening mechanism 200 is used to fasten the aluminum shell 500 of the battery downward to prevent the internal winding core from spreading the top cover 400 and the aluminum shell 500 apart, causing the assembly relationship between the aluminum shell 500 and the top cover 400 to change during welding and cause a cold weld; The locking mechanism 300 is used to control the opening and closing of the fastening mechanism 200 to unlock and fix the battery.

[0025] In one embodiment, the fastening mechanism 200 is provided with a first fastening portion and a second fastening portion having the same structure as the first fastening portion; The battery is placed between the first fastening portion and the second fastening portion, and both are used to fasten the aluminum shell 500 on the top of the battery downward to prevent the winding core inside the battery from opening the top cover 400 and the aluminum shell 500; The first fastening portion is provided with a first cam mounting seat 1 and a second cam mounting seat with the same structure as the first cam mounting seat 1; the first cam mounting seat 1 is provided with an arc-shaped through hole 2 at one end close to the battery, and the other end is connected to the slider of the first linear guide 3; a connecting rod base 4 is provided between the first cam mounting seat 1 and the second cam mounting seat, one end of the connecting rod base 4 is close to the slide rail of the first linear guide 3, and a pressure rod 5 is provided at the end close to the battery; a mounting hole 5-2 is provided on each side of the pressure rod 5, and the mounting hole 5-2 is used to connect the first cam bearing follower 5-1 and the second cam bearing follower; the connecting rod base 4 is away from the first linear guide A through hole 4-1 is provided at the other end of the guide rail 3; the through hole 4-1 is located between the two mounting holes 5-2, and the through hole 4-1 is connected to the two mounting holes 5-2 by a rotating shaft; the raised end of the first cam bearing follower 5-1 is placed in the arc-shaped through hole 2, and can move along the arc-shaped through hole 2 under the action of the driving member; a second linear guide rail 6 is installed on the left side of the connecting rod base 4, and a third linear guide rail 7 is installed on the right side; the sliders of the second linear guide rail 6 and the third linear guide rail 7 are both located on the outside, the outside of the slider is connected to the inside of the concave plate 11, the slide rail is located on the inside, and the inside of the slide rail is placed in the slot 8 of the connecting rod base 4.

[0026] In one embodiment, a vertical U-shaped slot 9 is opened on the outer side of the connecting rod base 4, and a second cam bearing follower 1-1 is installed on the inner side of the first cam mounting seat 1, and the protruding end of the second cam bearing follower 1-1 is placed in the U-shaped slot 9.

[0027] In one embodiment, two first clamping plates 10 are provided in the locking mechanism 300, and the outer sides of the second linear guide 6 and the third linear guide 7 are each connected to a first clamping plate 10, the front side of the first clamping plate 10 is connected to the rear side of the concave plate 11, and the inner sides of the two first clamping plates 10 are respectively connected to the outer sides of the slider of the second linear guide 6 and the slider of the third linear guide 7.

[0028] In one embodiment, a mounting hole 12 is provided in a first clamping plate 10 near the third linear guide rail 7; a fourth linear guide rail 13 is installed below the first linear guide rail 3, a slide rail of the fourth linear guide rail 13 is installed on the connecting rod base 4, a second clamping plate 14 is installed near the outer side of the slider of the fourth linear guide rail 13, a first rotating shaft is installed on the second clamping plate 14, and the first rotating shaft is used to install the connecting rod 15 on the second clamping plate 14; the other end of the connecting rod 15 is connected to the rear position of the first clamping plate 10 through the second rotating shaft.

[0029] In one embodiment, a height-changing block 16 is provided at the bottom of the connecting rod base 4 , and a laser baffle 17 is installed on a side of the height-changing block 16 close to the battery.

[0030] In one embodiment, the bottom of the height conversion block 16 is mounted on the fixture bottom plate 100 .

[0031] In one embodiment, a battery card is disposed on the outer side of the concave plate 11 , and one end of the battery card close to the battery is a card slot, and one side of the battery can be placed in the card slot of the battery card.

[0032] The battery is provided with a top cover 400 and an aluminum shell 500 , and the fixture bottom plate 100 is used to support and protect the top cover 400 .

[0033] After the aluminum shell 500 and the top cover 400 are assembled, the locking mechanism 300 controls the fastening mechanism 200 to press the aluminum shell 500 downward to prevent the winding core inside the battery from spreading the top cover 400 and the aluminum shell 500 apart.

[0034] In one embodiment, after the top cover 400 and the aluminum shell 500 are welded, the fastening mechanism 200 is lifted by the locking mechanism 300 to facilitate the removal of the battery from the fastening mechanism 200 .

[0035] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. A battery processing method, characterized in that: include: Step S1, the top of the aluminum shell (500) of the battery is pressed down to limit position by means of a fastening mechanism (200); the side of the aluminum shell (500) of the battery is limited by means of a limiting portion; the top cover (400) at the bottom of the battery is limited by means of a clamp bottom plate (100) of a clamp, and the fastening mechanism (200) and the limiting portion are provided in the locking mechanism (300); Step S2, while positioning, detecting the distance between the aluminum shell (500) and the top cover (400) by means of a detection mechanism, and determining whether the distance is less than a preset distance; Step S3, if yes, then the assembled object to be welded is obtained; if no, then the aluminum shell (500) is pressed downward by the fastening mechanism (200) until the distance between the aluminum shell (500) and the top cover (400) is less than a preset distance; Step S4, welding the object to be welded by welding equipment; Step S5: after welding is completed, the fastening mechanism (200) and the limiting portion move in a direction away from the battery.

2. A square shell power battery top cover welding fixture, used to perform the steps of the battery processing method according to claim 1, characterized in that: include: A fixture bottom plate (100) for positioning the top cover (400) and protecting the top cover (400) from contamination by welding slag during welding; A fastening mechanism (200) used to fasten the aluminum shell (500) of the battery downwardly; The locking mechanism (300) is used to control the opening and closing of the fastening mechanism (200) to unlock and fix the battery.

3. The square shell power battery top cover welding fixture according to claim 2 is characterized in that: The fastening mechanism (200) is provided with a first fastening portion and a second fastening portion having the same structure as the first fastening portion; A battery is placed between the first fastening portion and the second fastening portion, and both are used to fasten the aluminum shell (500) on the top of the battery downwards to prevent the winding core inside the battery from spreading apart the top cover (400) and the aluminum shell (500); The first fastening portion is provided with a first cam mounting seat (1) and a second cam mounting seat having the same structure as the first cam mounting seat (1); an arc-shaped through hole (2) is provided at one end of the first cam mounting seat (1) close to the battery, and the other end is connected to the slider of the first linear guide rail (3); a connecting rod base (4) is provided between the first cam mounting seat (1) and the second cam mounting seat, one end of the connecting rod base (4) is close to the slider of the first linear guide rail (3), and the other end close to the battery is provided with a pressure rod (5); a mounting hole (5-2) is provided on each side of the pressure rod (5), and the mounting hole (5-2) is used to connect the first cam bearing follower (5-1) and the second cam bearing follower; the connecting rod base (4) is away from the first linear guide rail (3 ) is provided with a through hole (4-1) at the other end; the through hole (4-1) is located between the two mounting holes (5-2), and the through hole (4-1) and the two mounting holes (5-2) are connected via a rotating shaft; the raised end of the first cam bearing follower (5-1) is placed in the arc-shaped through hole (2), and can move along the arc-shaped through hole (2) under the action of a driving member; a second linear guide rail (6) is installed on the left side of the connecting rod base (4), and a third linear guide rail (7) is installed on the right side; the sliders of the second linear guide rail (6) and the third linear guide rail (7) are both located on the outside, the outside of the slider is connected to the inside of the concave plate (11), the slide rail is located on the inside, and the inside of the slide rail is placed in the slot hole (8) of the connecting rod base (4).

4. The square shell power battery top cover welding fixture according to claim 3 is characterized in that: A vertical U-shaped slot (9) is provided on the outer side of the connecting rod base (4), a second cam bearing follower (1-1) is installed on the inner side of the first cam mounting seat (1), and a raised end of the second cam bearing follower (1-1) is placed in the U-shaped slot (9).

5. The square shell power battery top cover welding fixture according to claim 3 is characterized in that: Two first clamping plates (10) are provided in the locking mechanism (300); the outer sides of the second linear guide rail (6) and the third linear guide rail (7) are each connected to a first clamping plate (10); the front side of the first clamping plate (10) is connected to the rear side of the concave plate (11); and the inner sides of the two first clamping plates (10) are respectively connected to the outer sides of a slider of the second linear guide rail (6) and a slider of the third linear guide rail (7).

6. The square shell power battery top cover welding fixture according to claim 3, characterized in that: A first clamping plate (10) close to the third linear guide rail (7) is provided with a mounting hole (12); a fourth linear guide rail (13) is installed below the first linear guide rail (3); a slide rail of the fourth linear guide rail (13) is installed on a connecting rod base (4); a second clamping plate (14) is installed on a slider of the fourth linear guide rail (13) near the outer side; a first rotating shaft is installed on the second clamping plate (14); the first rotating shaft is used to mount a connecting rod (15) on the second clamping plate (14); the other end of the connecting rod (15) is connected to the rear position of the first clamping plate (10) via the second rotating shaft.

7. The square shell power battery top cover welding fixture according to claim 4, characterized in that: A height change block (16) is provided at the bottom of the connecting rod base (4), and a laser baffle (17) is installed on a side of the height change block (16) close to the battery.

8. The square shell power battery top cover welding fixture according to claim 7, characterized in that: The bottom of the height change block (16) is mounted on the fixture bottom plate (100).

9. The square shell power battery top cover welding fixture according to claim 3, characterized in that: A battery card is provided on the outer side of the concave plate (11); one end of the battery card close to the battery is a card slot, and one side of the battery can be placed in the card slot of the battery card.

10. The square shell power battery top cover welding fixture according to claim 3, characterized in that: After the top cover (400) and the aluminum shell (500) are welded, the fastening mechanism (200) is lifted up through the locking mechanism (300).

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