WO2018049571A1

WO2018049571A1 - Periphery sealing device for battery cell

Info

Publication number: WO2018049571A1
Application number: PCT/CN2016/098924
Authority: WO
Inventors: 殷科; 贾宝安; 王勇; 张亚杰
Original assignee: 东莞新能源科技有限公司
Priority date: 2016-09-13
Filing date: 2016-09-13
Publication date: 2018-03-22

Abstract

Provided in the present invention is a periphery sealing device for a battery cell, the device comprising: a positioning mechanism for holding a battery cell for edge sealing in position; a scanning mechanism scanning a contour of an end face of a periphery to be sealed of the battery cell; a coating mechanism for coating an insulating cement; a drive mechanism for driving the positioning mechanism and the coating mechanism to move relatively with respect to each other; and a control mechanism for receiving the contour of the end face of the periphery to be sealed of the battery cell scanned by the scanning mechanism, controlling, on the basis of the contour, the drive mechanism to drive the positioning mechanism and coating mechanism to move relatively with respect to each other, and controlling the coating mechanism to coat the cement on the end face of the periphery to be sealed of the battery cell. The periphery sealing device for a battery cell of the present invention has superior flexibility and compatibility, and is suitable for periphery sealing on all types of battery cells, thus simplifying a periphery sealing process of battery cells, and reducing a hardware cost. At the same time, a coating trajectory of an insulating cement coated by the coating mechanism highly matches a contour of an end face of a periphery to be sealed of a battery cell, thus effectively ensuring the quality of a battery cell periphery seal.

Description

Battery edge banding device

Technical field

The present invention relates to the field of battery manufacturing, and in particular to a battery edge banding device.

Background technique

After the bare cell of the lithium battery is covered by the upper and lower packaging films, there is a thin metal layer on the outer contour of the package side formed by thermocompression bonding of the two packaging films, and the metal layer is exposed to the risk of short-circuiting the electrical components, and Corrosion of the metal layer during long-term use poses a safety hazard to the safety of the battery core. The cell edge-sealing process uses a strip to cover the outer contour of the package edge to prevent the occurrence of exposed metal. The existing battery edge-sealing equipment is limited to rectangular batteries with regular shapes, and the equipment only needs to be positioned, glued, and folded. When the battery core is non-rectangular or other complicated structure, the device will not be able to move linearly at the edge of the packaging film due to design problems, and the rubber strip cannot completely cover the outer contour of the package edge, posing a risk of metal exposure. Therefore, the conventional solution cannot be applied to non-rectangular cells.

Summary of the invention

In view of the problems in the prior art, the object of the present invention is to provide a battery edge banding device which has good flexibility and compatibility, is suitable for various types of batteries, and reduces the development difficulty of the glue coating process. The cost of equipment development and the quality of the glue.

In order to achieve the above object, the present invention provides a cell edge banding device, comprising: a positioning mechanism for fixing a battery cell to be sealed; a scanning mechanism for scanning an end face of an edge of a package edge of the battery cell; , for coating the insulating glue; driving mechanism, driving the positioning mechanism and the glue coating mechanism relative movement; and controlling the mechanism, receiving the contour information of the end face of the package side of the battery core scanned by the scanning mechanism, and controlling the driving based on the contour information The mechanism drives the positioning mechanism and the glue application mechanism to move relative to each other, and at the same time controls the glue application mechanism to apply glue on the end surface of the battery core package side.

The beneficial effects of the present invention are as follows:

In the cell edge banding device according to the present invention, the control mechanism moves the cell to be sealed to the scanning range of the scanning mechanism through the driving mechanism and the positioning mechanism, and then the scanning mechanism scans the package of the cell The contour of the end surface of the edge edge; the control mechanism receives the contour information scanned by the scanning mechanism, and then moves the battery core to be sealed to the coating range of the glue coating mechanism through the driving mechanism and the positioning mechanism; then the control mechanism according to the contour information Controlling the driving mechanism to drive the positioning mechanism and the glue coating mechanism to move relative to each other, and the relative movement trajectory matches the contour information, so that the glue coating mechanism moves along the end surface of the package side of the battery core to be sealed; in the process of relative movement The control mechanism controls the gluing mechanism to apply the insulating glue so that the gluing mechanism coats the end faces of the cell encapsulation side. The cell edge banding device of the present invention has better flexibility because the scanning mechanism can automatically scan the contours of the end faces of the package edge of various types of cells and control the glue coating mechanism to automatically apply glue through the control mechanism. And compatibility, suitable for the edge sealing of various types of batteries, simplifying the edge sealing process of the battery core and reducing the equipment cost; at the same time, the track of the insulating rubber coated by the rubber coating mechanism and the edge of the package edge of the battery core The contour of the end face has a high degree of fit, which effectively ensures the edge-sealing quality of the cell edge-sealing device of the present invention.

DRAWINGS

Figure 1 is a schematic view of a cell edge banding device in accordance with the present invention;

Figure 2 is another schematic view of a cell edge banding device in accordance with the present invention;

Figure 3 is an enlarged view of a portion of the circular frame in Figure 1;

Figure 4 is an enlarged view of a portion of the broken line in Figure 3;

Fig. 5 is a schematic view showing the battery core sealed by the battery edge banding device of the present invention.

Among them, the reference numerals are as follows:

1 positioning mechanism 324 plastic bucket

2 scanning mechanism 4 drive mechanism

3 glue application mechanism 41 first drive mechanism

31 mounting assembly 42 second drive mechanism

32 glue assembly 5 control mechanism

321 fixing frame 6 adjustment structure

322 valve B battery

3221 inlet port B1 package side

3222 rubber outlet B11 end face

323 needle

detailed description

The cell edge banding device of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 4, the cell edge banding device according to the present invention comprises: a positioning mechanism 1 for fixing a battery cell B to be sealed; and a scanning mechanism 2 for scanning an outline of an end face B11 of the edge of the package side B1 of the battery cell B; a glue applying mechanism 3 for coating an insulating glue; a driving mechanism 4 for driving the positioning mechanism 1 and the glue applying mechanism 3 to move relative to each other; and a control mechanism 5 for receiving the end face B11 of the package side B1 of the battery cell B scanned by the scanning mechanism 2 The contour information, and based on the contour information, controls the driving mechanism 4 to drive the relative movement of the positioning mechanism 1 and the glue applying mechanism 3, while controlling the glue applying mechanism 3 to apply glue on the end face B11 of the battery B package side B1.

In the cell edge banding device according to the present invention, the control mechanism 5 moves the battery cell B to be sealed to the scanning range of the scanning mechanism 2 through the driving mechanism 4 and the positioning mechanism 1, and then the scanning mechanism 2 scans the battery cell B. The outline of the end face B11 of the edge of the package edge B1; the control mechanism 5 receives the profile information scanned by the scanning mechanism 2, and then moves the battery cell B to be sealed to the coating range of the glue application mechanism 3 through the drive mechanism 4 and the positioning mechanism 1. The control mechanism 5 then controls the drive mechanism 4 to drive the relative movement of the positioning mechanism 1 and the glue application mechanism 3 according to the contour information, and the relative movement trajectory matches the contour information, so that the glue application mechanism 3 is along the edge to be sealed. The end face B11 of the package side B1 of the battery cell B moves (may be the glue coating mechanism 3 moves, or the battery core B moves); during the relative movement, the control mechanism 5 controls the glue application mechanism 3 to apply the insulating glue, thereby The glue applying mechanism 3 is applied with glue on the end face B11 of the battery package side B1. Since the scanning mechanism 2 can automatically scan the contours of the end faces B11 of the edge of the package side B1 of various types of the battery cells B, and control the automatic application of the glue applying mechanism 3 by the control mechanism 5, the battery core sealing device of the present invention With better flexibility and compatibility, it is suitable for the edge sealing of various types of batteries (especially the irregularly shaped battery B of the end face B11 of the package side B1, for example, referring to FIG. 5, for the edge having several inner The concave core or the plurality of convex curved corners of the battery core B, the contour of the end surface B11 of the package side B1 also has a plurality of concave angles or a plurality of convex curved angles), which simplifies the edge sealing process of the battery core and reduces the equipment cost; The trajectory of the insulating rubber coated by the glue applying mechanism 3 and the contour of the end surface B11 of the edge of the package edge B1 of the battery B are high, which effectively ensures the edge-sealing quality of the battery core sealing device of the present invention.

In addition, the scanning mechanism 2 can scan the end face B11 of the package side B1 in a two-dimensional contour, and can also scan the three-dimensional contour of the end face B11 of the package side B1. The control mechanism 5 can calculate the relative motion of the drive positioning mechanism 1 and the glue application mechanism 3 according to the contour information of the end face B11. The trajectory, thereby controlling the drive mechanism 4 to drive the relative movement of the positioning mechanism 1 and the glue application mechanism 3.

In the cell edge banding device according to the present invention, referring to Figs. 1 and 2, the scanning mechanism 2 scans the contour of the end face B11 of the edge of the package side B1 of the cell B on the XY plane. Correspondingly, the driving mechanism 4 includes: a first driving mechanism 41 connected to the positioning mechanism 1 and capable of driving the positioning mechanism 1 to move in the X direction; and a second driving mechanism 42 connected to the glue applying mechanism 3 and capable of driving the glue applying mechanism 3 Move in the Y direction. The first driving mechanism 41 and the second driving mechanism 42 may be a rail slider mechanism driven by a motor, and the positioning mechanism 1 and the glue applying mechanism 3 are fixed on the corresponding sliders. The XY plane is the plane in which the X direction and the Y direction are located.

In the cell edge banding device according to the present invention, in the process of applying the glue, if the contour of the end face B11 of the package side B1 to be glued (the profile on the XY plane) extends in the X direction, the glue applying mechanism 3 is maintained. The first driving mechanism 41 drives the battery core B to move in the X direction by the positioning mechanism 1. At the same time, the control mechanism 5 controls the glue applying mechanism 3 to apply glue on the end surface B11 during the moving process; if the contour of the end surface B11 extends in the Y direction , the battery core B is stationary, the second driving mechanism 42 drives the glue applying mechanism 3 to move in the Y direction, and at the same time, during the moving process, the control mechanism 5 controls the glue applying mechanism 3 to apply glue on the end surface B11; if the contour of the end surface B11 is The XY plane extends with a fold line or a curve, and the battery core B and the glue application mechanism 3 are simultaneously moved, so that the relative movement trajectory of the battery core B and the glue application mechanism 3 conforms to the contour of the end surface B11, and at the same time, the control mechanism during the movement 5 Control the gluing mechanism 3 to apply glue on the end face B11. It is added here that the package side B1 of the battery cell B is relatively flat after hot pressing, and the change in the Z direction is small, so the scanning mechanism 2 only needs to scan the end face B11 of the edge of the package side B1 of the battery cell B in the XY plane. The outline on it can be.

In the battery edge banding device according to the present invention, referring to FIGS. 1 and 2, the glue applying mechanism 3 includes: a mounting assembly 31 fixed to the second driving mechanism 42; and a glue applying assembly 32 fixed to the mounting assembly 31 .

In the battery edge banding device according to the present invention, referring to FIG. 1 and FIG. 2, the glue assembly 32 includes: a fixing frame 321 fixed on the mounting assembly 31; and a glue valve 322 fixed on the fixing frame 321 and having a glue feeding The port 3221 and the glue outlet 3222; the needle 323 is fixed to the glue outlet 3222 of the valve 322; and the glue barrel 324 is internally filled with the insulating glue and communicates with the glue inlet 3221 of the valve 322. When the control mechanism 5 controls the glue assembly 32 to be glued, the insulating glue in the glue barrel 324 flows out from the needle 323 via the glue inlet 3221, the glue valve 322, and the glue outlet 3222. In the gluing process, the end face B11 of the package side B1 of the battery cell B is located on the lower side (or upper side) of the needle 323 in the Z direction, and the needle 323 flows out. The insulating glue is adhered to the end face B11 of the package side B1 (the insulating glue may also flow to the portion of the package side B1 close to the end face B11, that is, the plane on both sides of the end face B11 on the package side B1). The flow rate and flow rate of the insulating glue can be adjusted by changing the diameter and length of the needle 323. When the width of the glue is required to be large, a needle 323 having a larger diameter can be selected. If the width of the glue is too large, the control mechanism 5 can control the glue applying mechanism 3 to apply the glue to the battery B a plurality of times.

In the cell edge banding device according to the present invention, referring to Figures 1 and 2, the glue assembly 32 is two sets and is relatively fixed to the mounting assembly 31 in the Z direction, and the needles 323 of the two sets of glue assemblies 32 are opposed. In the gluing process, the end face B11 of the package side B1 of the cell B is located between the two opposing needles 323. The viscosity of the insulating colloid with relatively high viscosity is relatively poor. A set of rubber-coated components 32 may not cover all the end faces B11 only on one side of the end face B11. In addition, the one-side gluing may also be unstable due to liquid or motion. The irregularity causes the coating to form a colloid which is unevenly distributed and intermittent. Therefore, the two groups of the front and back glue assemblies 32 are simultaneously coated to ensure that the end face B11 is completely covered by the insulating glue. At the same time, since the glue applied to the end face B11 is randomly distributed on the back side (ie, one of the sides of the package side B1 located on the sides of the end face B11 away from the needle 323), the shape of the colloid is irregular, and the edge is not beautiful after folding. Therefore, the use of the front and back two sets of glue assembly 32 at the same time can be glued on the side of the package side B1 on both sides of the end face B11 has a beautiful appearance of colloidal shape.

In the cell edge banding device according to the present invention, the first driving mechanism 41 can only drive the end face B1 of the edge of the package side B1 of the battery cell B to move in the XY plane, and this XY plane is located in the Z direction in the two needles 323. between.

In the cell edge banding device according to the present invention, the control mechanism 5 applies a stable pressure to the glue barrel 324 to squeeze the insulating glue inside the glue barrel 324 into the glue valve 322. When the glue application mechanism 3 is required to be glued, the control mechanism 5 applies pressure to the glue barrel 324 so that the insulation glue in the glue barrel 324 flows out from the needle 323 through the glue inlet 3221, the glue valve 322, and the glue outlet 3222. The pressure applied by the control mechanism 5 to the rubber tub 324 must be stabilized to ensure that the gel formed by the flowing insulating rubber is smooth and smooth without wrinkles, bulges, bubbles or leaks.

In the cell edge banding device according to the present invention, the scanning mechanism 2 scans the contour of the end face B11 of the edge of the package side B1 of the cell B in three dimensions. Correspondingly, the driving mechanism 4 can also be connected only to the glue applying mechanism 3, and the positioning mechanism 1 can be fixed; the driving mechanism 4 can drive the glue applying mechanism 3 in a three-dimensional space according to the contour of the end face B11 of the package side B1 to be glued. The positioning mechanism 1 is moved, and at the same time, the control mechanism 5 controls the glue application mechanism 3 to apply glue on the end face B11 during the movement. Drive mechanism 4 also It can be connected only to the positioning mechanism 1 and the glue applying mechanism 3 can be fixed. The driving mechanism 4 can drive the positioning mechanism 1 to move relative to the positioning mechanism 1 in the three-dimensional space according to the contour of the end face B11 of the package side B1 to be glued. The control mechanism 5 controls the gluing mechanism 3 to apply glue on the end face B11 during the movement. The drive mechanism 4 can be a three-axis robot, a four-axis robot or a six-axis robot.

In the cell edge banding device according to the present invention, the scanning mechanism 2 is a CCD image detector that can scan a two-dimensional contour or scan a three-dimensional contour.

In the cell edge banding device according to the present invention, referring to FIGS. 1 and 2, the cell edge banding device further includes an adjustment structure 6 fixedly coupled to the scanning mechanism 2 and capable of driving the scanning mechanism 2 to move in the Z direction. The adjustment structure 6 can adjust the distance between the scanning mechanism 2 and the battery B in the Z direction to ensure that the image scanned by the scanning mechanism 2 is clear.

In the cell edge banding device according to the present invention, the insulating glue applied by the glue applying mechanism 3 is a heat curing adhesive, a photoinitiating curing adhesive or a hot melt adhesive. These glues have the advantages of fast forming speed, good maneuverability and controllable window time. In the mass production process, the curing speed will affect the efficiency of the cell produced per unit time, and the controllability of the window time can ensure sufficient time to complete the specific process steps. Other types (such as low temperature curing) do not meet the above requirements, and may cause cracking or melting of the glue during the hemming process and the hot edge process, which may invalidate the section protection.

In the cell edge banding device according to the present invention, the viscosity of the insulating rubber applied by the gumming mechanism 3 is from 5,000 cP to 10,000 cP. The viscosity of the insulating glue should be selected appropriately. The glue with too low viscosity will cause the liquid column to break, causing the colloid to be discontinuous, or the liquid flowing through the cross section to form a gap, causing the metal layer to be exposed. A glue with too high viscosity causes a decrease in fluidity, and the liquid does not smoothly flow to the cross section, causing the metal layer of the cross section to be exposed. At the same time, for some areas with narrow slits, the excessive viscosity of the colloids causes the narrow slits to be blocked by the glue, posing a potential risk in subsequent folding or use.

In the cell edge banding device according to the present invention, the package side B1 of the battery cell B to be sealed is sealed and connected by two layers of packaging film, and the metal is exposed on the end face B11 of the edge of the package side B1. The insulating rubber layer formed by the cell edge sealing device of the present invention fits the end surface B11 of the package side B1 of the battery core B, thereby ensuring that the exposed metal of the end surface B11 is completely covered, improving the coating quality of the insulating rubber and avoiding the battery core B. Short circuit and corrosion of metal.

In the cell edge banding device according to the present invention, the positioning mechanism 1 can be a positioning jig. Once the battery B is fixed by the positioning fixture, do not loosen or replace the positioning fixture to avoid large errors in the secondary positioning, resulting in the glue not appearing in the required position.

In the cell edge banding device according to the present invention, after the glue applying mechanism 3 finishes coating the end face B11 of the package side B1 of the battery cell B, the battery core B is sent into a curing environment (ultraviolet light environment or thermal environment) for insulation. The curing of the glue.

Claims

A battery edge banding device, comprising:

Positioning mechanism (1), fixing the battery core (B) to be sealed;

a scanning mechanism (2) for scanning an outline of an end surface (B11) of an edge of the package side (B1) of the battery cell (B);

a glue application mechanism (3) for coating an insulating glue;

Driving mechanism (4), driving positioning mechanism (1) and glue coating mechanism (3) relative movement;

a control mechanism (5) receives contour information of an end surface (B11) of a package side (B1) of the battery cell (B) scanned by the scanning mechanism (2), and controls the driving mechanism (4) to drive the positioning mechanism based on the contour information ( 1) Relative movement with the glue application mechanism (3), while controlling the glue application mechanism (3) to apply glue on the end face (B11) of the package side (B1) of the battery core (B).
The cell edge banding device according to claim 1, wherein

The scanning mechanism (2) scans the contour of the end face (B11) of the edge of the package side (B1) of the battery cell (B) on the XY plane;

The drive mechanism (4) includes:

The first driving mechanism (41) is connected to the positioning mechanism (1) and can drive the positioning mechanism (1) to move in the X direction;

The second driving mechanism (42) is connected to the glue applying mechanism (3) and can drive the glue applying mechanism (3) to move in the Y direction.
The cell edge banding device according to claim 2, wherein the glue applying mechanism (3) comprises:

a mounting assembly (31) fixed to the second drive mechanism (42);

The glue assembly (32) is fixed to the mounting assembly (31).
The cell edge banding device according to claim 3, wherein the glue applying assembly (32) comprises:

a fixing frame (321) fixed to the mounting assembly (31);

The valve (322) is fixed on the fixing frame (321) and has a glue inlet (3221) and a glue outlet (3222);

a needle (323) fixed to the glue outlet (3222) of the valve (322);

The rubber barrel (324) is internally filled with an insulating glue and communicates with the glue inlet (3221) of the valve (322).
The cell edge banding device according to claim 4, wherein the glue applying components (32) are two sets and are relatively fixed on the mounting component (31) in the Z direction, and the two sets of the glue applying components (32) The needle (323) is opposite.
The cell edge banding device according to claim 4, wherein the control mechanism (5) applies a stable pressure to the glue barrel (324) to squeeze the insulating glue inside the rubber barrel (324) into the glue valve (322). .
The cell edge banding device according to claim 1, wherein the scanning mechanism (2) is a CCD image detector.
The cell edge banding device according to claim 1, wherein the cell edge banding device further comprises:

The adjustment structure (6) is fixedly coupled to the scanning mechanism (2) and is capable of driving the scanning mechanism (2) to move in the Z direction.
The cell edge banding device according to claim 1, characterized in that the insulating glue coated by the glue applying mechanism (3) is a heat curing adhesive, a photoinitiating curing adhesive or a hot melt adhesive.
The cell edge banding device according to claim 1, wherein the adhesive of the glue applying mechanism (3) has a viscosity of from 5,000 cP to 10,000 cP.
The cell edge banding device according to claim 1, wherein the package edge (B1) of the battery cell (B) to be sealed is sealed and connected by two layers of packaging film, and the edge of the package side (B1) is sealed. Metal is exposed on the end face (B11).