CN201002181Y - Welding jig for prismatic batteries - Google Patents

Abstract

The utility model provides a welding fixture for a square battery, which is used for accurately and firmly positioning the battery when welding the shell of the square battery, and fully guarantees the welding strength and sealing performance of the battery. The welding fixture of the square battery includes a support frame, a push rod, a guide rod and a cam, wherein the support frame has four sides, up, down, left, and right, and these four sides form a space, and the opposite sides are parallel to each other; the push rod is parallel to each other. The upper and lower sides are arranged in the support frame, and the two ends of the push rod are respectively arranged on the left and right sides of the support frame to slide up and down, and the push rod has a vertical guide hole; one end of the guide rod is fixed on the top of the support frame. On the side or lower side, the other end is inserted into the guide hole; the cam is rotatably hinged in the middle of the upper side of the support frame, and the cam surface of the cam is in slidable contact with the upper surface of the push rod. By turning the cam, the push rod can be driven to move down, so that the battery can be positioned accurately and firmly.

Description

Welding jig for prismatic batteries

technical field

The utility model relates to a battery clamp used in the battery welding process, in particular to a square battery welding clamp.

Background technique

With the improvement of society's environmental protection requirements, safe, pollution-free and high-capacity lithium-ion batteries have become an ideal new generation of energy. It is widely used in mobile phones, PDAs, EVs, HEVs and other fields. A general lithium-ion battery includes a pole core composed of positive and negative electrodes and a separator, a battery case for encapsulating the pole core, and an electrolyte injected into the case. For the case of a small battery, due to its small size, the case and bottom cover can be stretched into an integral structure with the case during the forming process of the case. When packaging the pole core, only the cover plate needs to be welded. However, for lithium-ion battery casings with medium and high capacity and high power, due to their large size, the casing and bottom cover need to be connected together through a welding process.

In the prior art, the welding of the casing and the bottom cover and the casing and the cover plate in the battery is usually completed by a laser welding machine. Laser welding machine uses high-energy pulse laser to weld objects. The high energy and high density of laser pulse can make the welding smooth, the weld width is small and the heat-affected zone is small, and it can complete the precision welding that cannot be realized by traditional technology. In addition, laser welding has high efficiency, good effect, simple and convenient operation, and is suitable for welding of plane straight lines, arcs and arbitrary trajectories of various materials. Therefore, laser welding is widely used in the welding production of steel/aluminum battery case, cover plate and bottom plate. Welding the battery case and bottom cover and case and cover plate by laser welding machine has been recorded in many patent documents, for example, CN2573143 Y, CN 2614834 Y, CN 2614835 Y or the like.

However, since the shell wall thickness of steel/aluminum shell batteries is often very small, if there is a slight deviation in laser welding, the welding strength will be insufficient or the sealing performance will be affected, causing safety problems such as battery leakage, so in order to ensure battery welding The strength and sealing performance objectively put forward higher requirements for the positioning accuracy of the laser welding jig that fixes the battery case.

Utility model content

The purpose of the utility model is to provide a welding jig for a square battery, which is used to accurately and firmly position the battery when welding the shell of the square battery, so as to fully ensure the welding strength and sealing performance of the battery.

The welding fixture of the square battery provided by the utility model includes a support frame, a push rod, a pair of guide rods and a cam, wherein: the support frame has four sides of up and down, left and right, and these four sides enclose a space, and the relative The sides are parallel to each other; the push rod is arranged in the support frame parallel to the upper and lower sides, and the two ends of the push rod are respectively arranged on the left and right sides of the support frame to slide up and down, and the push rod has a vertical guide hole; the guide rod One end is fixed on the upper or lower side of the support frame, and the other end is inserted into the guide hole; the cam is rotatably hinged at the middle position of the upper side of the support frame, and the cam surface of the cam and the push rod The upper surface is in slidable contact.

When welding the battery casing, the battery is first placed in the space of the support frame, and then the cam is rotated relative to the upper side of the support frame, and the cam surface of the cam drives the push rod to move vertically downwards, so that the battery is moved by the push rod Holds securely for precise laser welding. When the cam is rotated, the cam surface slides along the upper surface of the push rod, and when the abaxial point of the cam surface slides onto the upper surface of the push rod, the cam locks and the push rod moves down the farthest distance, thereby firmly holding the battery And it is stably pressed in the support frame, that is, the battery is fixed between the lower side of the support frame and the push rod.

Therefore, through the technical solution of the utility model, the battery can be conveniently and accurately and firmly positioned when welding the casing of the prismatic battery, thereby fully ensuring the welding strength and sealing performance of the battery.

Description of drawings

Fig. 1 is a perspective view of a typical embodiment of a directional battery welding jig of the present invention;

Fig. 2 is a structural diagram of the support frame in Fig. 1;

Fig. 3 is an exploded perspective view of the cam and the cam support in Fig. 1;

Fig. 4 is a working diagram of the cam in Fig. 1 .

Description of drawings

Describe the utility model in detail below with reference to accompanying drawing.

As shown in Figure 1, according to a typical embodiment of the present invention, a welding fixture for a square battery is provided, the fixture includes a support frame 1, a push rod 3, a pair of guide rods 4 and a cam 6, wherein: the support frame 1 has four sides 11, 12, 13, 14 up, down, left, and right, these four sides enclose a space, and the opposite sides 11 and 12 and 13 and 14 are parallel to each other; the push rod 3 is parallel to the upper and lower sides 11 and 12 are arranged in the support frame 1, and the two ends of the push rod 3 can slide up and down respectively on the left and right sides 13, 14 of the support frame 1, and the push rod 3 has a vertically arranged guide hole 31; the guide rod 4 One end is fixed on the upper side 11 or the lower side 12 of the support frame 1, and the other end is inserted into the guide hole 31; the cam 6 is rotatably hinged at the middle position of the upper side 11 of the support frame 1, and the cam The cam surface 61 of 6 is in slidable contact with the upper surface of push rod 3 .

The support frame 1 is preferably an integral structure, made of copper, stainless steel, steel, aluminum alloy and other materials with a certain strength, so the mechanical properties are good, and after a long time of use, it will not cause inaccurate positioning of the battery due to deformation, resulting in welding The offset of the trajectory, so the battery has a high positioning accuracy. When in use, the battery 2 is positioned in the space enclosed by the four sides of the support frame 1 in the support frame 1, more specifically, the left and right sides and the lower side of the support frame 1 and the lower surface of the push rod 3 In the space between, the battery 2 can be clamped or loosened by moving the push rod 3 up and down.

As an example, as shown in FIG. 1 , two batteries 2 can be placed in the space of the supporting frame 1 at the same time, and laser welding is performed on the battery case. However, the present invention is not limited thereto. Those skilled in the art can easily understand that by simply modifying the size of the support frame 1 or the space in the support frame 1, one battery, or three or more batteries can be placed in the space of the support frame at the same time, so that the battery The housing is laser welded.

When two batteries are simultaneously placed in the space of the support frame 1 as shown in FIG. ). Through this boss 7, when the two batteries 2 and the battery bottom cover or cover plate to be welded are placed in the space, the two batteries and the battery bottom cover or cover plate can be accurately positioned using this boss 7 as a reference . When it is necessary to weld the battery casing and the bottom cover or the battery casing and the cover plate, the bottom cover or the cover plate are placed on both sides of the boss 7, and then the battery 2 is placed on the bottom cover or the cover plate for accurate positioning. Preferably, the height of the boss 7 is slightly smaller than the thickness of the bottom cover or the cover plate. If the boss 7 is flush with the bottom cover or the cover plate, or even higher than the bottom cover or the cover plate, then when the laser passes through the contact position between the boss and the bottom cover or the cover plate, there may be a fire phenomenon, so there is Security risks.

In addition, those skilled in the art should understand that the arrangement of the above-mentioned boss 7 is only a preferred embodiment, and within the protection scope of the present utility model, the arrangement of the boss 7 can be adjusted according to the number of batteries 2 placed in the support frame 1 and other factors. The layout of 7 has been adaptively modified. For example, in the case of placing three or more batteries 2 in a support frame 1, a boss 7 can be set between every two adjacent batteries 2, so that each battery bottom that needs to be welded Cover or cover plate for accurate positioning.

As shown in Figures 1 and 2, in order to enable the push rod 3 to move vertically up and down in the support frame 1, guide grooves 15 and 16 can be set on the left and right sides 13 and 14 of the support frame 1, and the left and right sides of the push rod 3 The two ends are respectively arranged in the guide grooves 15 and 16 so as to be able to move up and down along the guide grooves 15 and 16 . Thus, the vertical movement of the push rod 3 relative to the supporting frame 1 can be realized. Those skilled in the art should understand that this structure is only an embodiment of the utility model, but the utility model is not limited to this specific structure. The vertical up and down movement of the push rod 3 in the support frame 1 can also be realized through other structures in the prior art. For example, all or a part of the left and right sides 13 and 14 of the support frame 1 can be made into guide rails or guide columns, and correspondingly the two ends of the push rod 3 can be set as guide grooves or guide rings matched therewith; All or part of the inner surfaces of the left and right sides 13 and 14 of the frame 1 are set to a specific shape such as an inverted T shape, and the two ends of the push rod 3 are set to a matching shape, etc., to achieve a push rod. 3 vertical (ie up and down) movement relative to the supporting frame 1.

The function of the guide rod 4 is to guide the push rod 3 to move up and down in the support frame 1 . The shape of the guide rod 4 can be cylindrical, square, triangular, etc., preferably cylindrical. The shape of the guide hole 31 in the push rod 3 is consistent with that of the guide rod 4 and cooperates with each other.

As shown in Figures 1 and 2, as a preferred embodiment, the guide rod 4 includes a pair of guide rods whose ends are fixed on the left and right sides of the upper side 11 of the support frame 1, and in the push rod 3 The guide holes 31 include a pair of guide holes corresponding to the pair of guide rods. The lower ends of a pair of guide rods 4 are respectively inserted into a pair of guide holes 31 so as to guide the push rod 3 to move up and down in the support frame 1 .

Those skilled in the art should understand that the above-mentioned structure of the guide rod 4 is only a preferred embodiment, and various modifications can be made to the guide rod 4 within the protection scope of the present invention. For example, as an example, the guide rod 4 may be arranged between the push rod 3 and the lower side 12 of the support frame 1, and be located at a middle position in the left-right direction. Alternatively, in the case of placing three or more batteries 2 in one supporting frame 1 , a guide rod 4 may also be provided between every two adjacent batteries 2 . Therefore, the present invention does not specifically limit the specific structure and arrangement of the guide rod 4 , as long as the guide rod 4 can achieve the purpose of guiding the vertical movement of the push rod 3 relative to the support frame 1 .

As shown in FIGS. 1 and 4 , when the cam 6 rotates, the cam 6 can rotate along the width direction of the push rod 3 , that is, rotate along a direction perpendicular to the paper plane in FIG. 1 . In addition, the cam 6 can also rotate along the length direction of the push rod 3 , that is, rotate along the left and right directions of the paper in FIG. 1 , which can also achieve the purpose of pushing the push rod 3 downward.

The cam 6 is hinged on the supporting frame 1 so as to be able to rotate relative to the supporting frame 1, and the hinged mode can be various known modes well known to those skilled in the art. For example, it can be achieved most simply by passing a pin shaft through the upper side of the cam 6 and the support frame 1 .

Since the overall thickness of the support frame 1 can be made relatively thin, for example substantially the same as the thickness of the square battery 2, or even less than the thickness of the direction battery 2, the hinged cam is directly passed through the upper side of the support frame 1 by the pin shaft 6 may reduce the overall strength of the supporting frame 1. Therefore, as shown in the figure, a cam strut 5 can also be provided for the cam 6, and a hinge shaft 51 is fixed or integrally formed on the cam strut 5, and the cam strut 5 can be fixed on the support frame by welding or threaded connection. 1 on the upper side 11, and then the cam 6 is rotatably hinged on the cam strut 5 through the hinge shaft 51. Thus, the rotatable hinge between the cam 6 and the support frame 1 can be realized simply.

The working process of the welding jig of the square battery of the present invention will be described below.

First place the support frame 1 on a plane, such as a workbench plane, and then place the battery cover or battery bottom cover that needs to be welded to the battery case in parallel to the inner surface of the lower side 12 of the support frame 1, And it is positioned by the boss 7 fixed on the inner side of the lower side 12 of the support frame 1 . Then, put the two square batteries 2 into the space of the support frame 1, make the battery case close to the inner sides of the left and right sides 13 and 14 of the support frame 1, and the bottom edge of the battery case is accurately positioned on the battery cover or the bottom of the battery. cover.

After the battery 2 and the battery cover or the battery bottom cover are accurately placed in the support frame 1, the cam 6 is moved to rotate the cam 6.

As shown in FIG. 4 , the solid line is the state before the cam 6 rotates. At this moment, the minor axis point A on the cam surface 61 is in contact with the upper surface of the push rod 3 , and the battery 2 is not fastened by the cam 6 at this moment. When the cam 6 rotates along the direction a in the figure, the push rod 3 is pushed down along the Y-axis direction. When the far axis point B on the cam surface 61 is in contact with the upper surface of the push rod 3, as shown by the dotted line in Figure 4, the maximum distance of the eccentric wheel and the maximum downward distance of the push rod 3 have been reached. The maximum friction between the cam surface 61 of the cam 6 and the upper surface of the push rod 3, so that the cam 6 can firmly lock the push rod 3, and the push rod 3 can also firmly fasten the battery case and the cover plate or bottom cover. At this time, the pressing distance X given by the cam 6 to the push rod 3 is greater than the thickness of the battery cover or bottom cover, so that the battery case and the cover or bottom cover can be in close contact during welding, so as not to cause false welding.

Then, place the welding jig of the square battery of the utility model with the battery 2 and the cover plate or the bottom cover clamped as a whole on the welding base platform of the laser welding machine, and start the welding operation after fixing with a fixing device such as a cylinder. Weld the shell and cover plate or shell and bottom cover of the battery 2 .

In the utility model, because the cam 6 is designed according to the principle of the eccentric wheel, the push rod 3 can be pressed down as long as the cam 6 is gently moved, so that the left and right sides of the battery cover or the bottom plate bear uniform pressure, and, through The shape of the cam surface 61 of the cam 6 and the distance between the push rod 3 and the lower side 12 of the support frame 1 are designed so that when the downward distance of the push rod 3 reaches the maximum and the cam 6 is locked, The tight contact between the battery case and the cover or bottom cover can be fully ensured. At the same time, since the middle part of the inner side of the lower side 12 of the supporting frame 1 has the boss 7, the battery cover or the bottom cover can be well positioned. During the welding process, the misalignment of the battery shell and the cover plate or bottom cover can be effectively prevented, problems such as desoldering and liquid leakage of the battery can be avoided, and the sealing performance and welding strength of the battery can be improved.

Claims (8)

1, a kind of weld jig of rectangular cell is characterized in that, these anchor clamps comprise support frame (1), push rod (3), guide rod (4) and cam (6), wherein:

Support frame (1) has four sides (11,12,13,14) up and down, and these four sides surround a space, and opposed side edges is parallel to each other;

Side (11,12) was arranged in the support frame (1) about push rod (3) was parallel to, and the two ends of push rod (3) can slide up and down to respectively be arranged on the left and right sides side (13,14) of support frame (1), have vertically disposed guide hole (31) in the push rod (3);

One end of guide rod (4) is fixed on the upper side edge (11) or lower side (12) of support frame (1), and the other end is inserted in the described guide hole (31);

Cam (6) is hinged on the centre position of the upper side edge (11) of support frame (1) rotationally, and the cam surface (61) of cam (6) contacts slidably with the upper surface of push rod (3).

2, weld jig according to claim 1 is characterized in that, these anchor clamps also comprise boss (7), and this boss (7) is fixed on the center of inboard of the lower side (12) of support frame (1).

3, weld jig according to claim 1, it is characterized in that, have guide groove (15,16) on the left and right sides side (13,14) of support frame (1), the two ends, the left and right sides of described push rod (3) are separately positioned in the guide groove (15,16), can move up and down along guide groove (15,16).

4, weld jig according to claim 1, it is characterized in that, described guide rod (4) comprises that an end is fixed on the pair of guide rods of the left and right sides of the upper side edge of support frame (1) (11), and the guide hole (31) in the described push rod (3) comprises and the corresponding a pair of guide hole of this pair of guide rods.

5, weld jig according to claim 1 is characterized in that, described cam (6) can rotate along the width of push rod (3).

6, weld jig according to claim 1 is characterized in that, described cam (6) can rotate along the length direction of push rod (3).

7, according to claim 1 or 5 or 6 described weld jigs, it is characterized in that, these anchor clamps also comprise cam pillar (5) and are fixed on hinge (51) on the cam pillar (5), cam pillar (5) is fixed on the upper side edge (11) of support frame (1), and cam (6) is hinged on the cam pillar (5) rotationally by hinge (51).

8, weld jig according to claim 1 is characterized in that, described support frame (1) is an integral structure.

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