Connecting piece limiting block

Abstract

The utility model discloses a connecting piece limiting block which comprises a body, a positioning groove is formed in the top of the body and used for positioning a connecting piece, and a cooling channel is formed in the body and used for a cold source to pass through. After each time of welding, a cold source can be introduced into the cooling channel to eliminate residual heat on the body after welding, so that the effect of each time of welding is ensured to be in the same state, the phenomenon of poor welding is reduced, the assembling and welding yield is improved, and the quality of a battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery production especially relates to a connecting sheet limit block. BACKGROUND

[0002] Lithium battery is the power energy core of new energy automobile, and the production and manufacture of lithium battery involve multiple processes, and its performance is closely related to process and manufacturing equipment. Improving each process, especially the process yield of key processes, is crucial to improving the qualified rate and quality of battery shipment. The tab connecting piece welding process is one of the key processes in the lithium battery production link. After the tab of the battery cell is shaped and pressed tightly, it is placed on the connecting piece, and then the positive / negative tab of the battery cell is welded together with the connecting piece through laser welding. Among them, in order to improve the capacity, square lithium ion battery generally adopts double-stacked core or four-stacked core mode, at this time the double-stacked core needs to be connected by welding with the connecting piece, the process is as follows: the connecting piece is placed on the connecting piece limiting block, then the battery cell is placed on both sides of the connecting piece, and the tab is ensured on the connecting piece, then the laser pressure head is used to press the tab and the connecting piece, then the double battery cell and the connecting piece are welded together through laser welding, and then the next welding process is repeated, and the process is shown in the figure.

[0003] However, in the actual production process, the material of the connecting piece limiting block is generally brass, in order to quickly dissipate the heat conduction heat caused by welding, but in order to achieve the ideal tab and connecting piece welding effect in the production process, a larger welding power and a slower welding time are generally required, which leads to the appearance of heat affected zone on the back of the tab and the connecting piece, which causes the back of the connecting piece to be easily oxidized and affects the welding effect of the cover plate in the next process. UTILITY MODEL CONTENTS

[0004] In view of the above problems existing in the existing welding, the present application aims to provide a connecting piece limiting block which can improve the stability and yield of welding and reduce the risk of assembly welding.

[0005] The specific technical scheme is as follows:

[0006] A connecting piece limiting block comprises a body, the top of the body has a positioning groove for positioning the connecting piece, and the body has a cooling channel for the passage of cooling source.

[0007] As a further improvement and optimization of the present application, the cooling channel is in U-shaped structure.

[0008] As a further improvement and optimization of the present application, the side surface of the body has a cooling source inlet and a cooling source outlet which communicate with the cooling channel.

[0009] As a further improvement and optimization of the present solution, the positioning groove is a rectangular groove and matches the connecting piece.

[0010] As a further improvement and optimization of the present solution, the body is a rectangular block and the positioning groove is arranged on the top of the body.

[0011] As a further improvement and optimization of the present solution, the rectangular block is provided with a notch at each corner.

[0012] As a further improvement and optimization of the present solution, the notch is an arc-shaped notch.

[0013] As a further improvement and optimization of the present solution, the body is made of brass.

[0014] As a further improvement and optimization of the present solution, the cooling channel is located below the positioning groove.

[0015] As a further improvement and optimization of the present solution, the long side of the positioning groove is parallel to the long side of the body.

[0016] The above technical solution has the following positive effects compared with the prior art:

[0017] In the present utility model, the cooling channel is filled with a cold source after each welding to eliminate the residual heat on the body after welding, thereby ensuring that the effect of each welding is in the same state, reducing the occurrence of poor welding, improving the assembly welding yield and improving the quality of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic diagram of the connecting piece limiting block in the use state of the present utility model;

[0019] Figure 2 Fig. 2 is a structural schematic diagram of the connecting piece limiting block of the present utility model;

[0020] Figure 3 Fig. 3 is a schematic diagram of the internal structure of the connecting piece limiting block of the present utility model;

[0021] Figure 4 Fig. 4 is a welding process flowchart of the tab and the connecting piece of the prior art battery cell;

[0022] Figure 5 Fig. 5 is a welding process flowchart of the tab and the connecting piece of the battery cell of the present utility model;

[0023] In the drawings: 1, battery cell; 2, connecting piece; 3, body; 31, positioning groove; 32, cold source inlet; 33, cold source outlet; 34, notch; 35, cooling channel. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the indicated device or element to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second", "third" appear, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Figure 1 is a structural schematic view of the connecting piece limiting block in the use state of the present application, Figure 2 is a structural schematic view of the connecting piece limiting block of the present application, Figure 3 is a structural schematic view of the connecting piece limiting block of the present application, Figure 4 is a welding process flowchart of the existing technology electrode lug and connecting piece, Figure 5 is a welding process flowchart of the electrode lug and connecting piece of the present application, as Figures 1-5 shown, a connecting piece limiting block of a preferred embodiment is shown, comprising: a body 3, the top of the body 3 has a positioning groove 31 for positioning the connecting piece 2, the body 3 has a cooling channel 35 for the passage of a cooling source.

[0028] In the welding process, the connecting piece 2 is positioned in the positioning groove 31, then the tab of the battery cell 1 is placed on the connecting piece 2, the tab and the connecting piece 2 are pressed by the laser pressing head, and the battery cell 1 and the connecting piece 2 are welded together by laser welding. Then, the cooling channel 35 is connected to the cooling source (cold air or cold water) to eliminate the residual heat of the limiting block of the connecting piece 2 after welding, and then recycled for the next welding process.

[0029] In the embodiment, the cooling channel 35 is connected to the cooling source after each welding process to eliminate the residual heat of the body 3 after welding, thereby ensuring that the effect of each welding process is in the same state, reducing the occurrence of welding defects, improving the assembly welding yield, and improving the quality of the battery cell 1.

[0030] Further, as a preferred embodiment, in order to improve the heat elimination effect, the cooling channel 35 has a U-shaped structure.

[0031] Further, in an embodiment, the cooling channel 35 can also have an "S" structure to increase the heat exchange stroke of the cooling source and improve the heat elimination effect of the body 3.

[0032] Further, as a preferred embodiment, the side surface of the body 3 has a cooling source inlet 32 and a cooling source outlet 33 connected to the cooling channel 35.

[0033] Further, as a preferred embodiment, the positioning groove 31 is a rectangular groove and matches the connecting piece 2.

[0034] Further, as a preferred embodiment, the body 3 is a rectangular block, and the positioning groove 31 is arranged on the top of the body 3.

[0035] Further, as a preferred embodiment, the four corners of the rectangular block are provided with notches 34.

[0036] Further, as a preferred embodiment, the notch 34 is an arc-shaped notch 34.

[0037] Further, as a preferred embodiment, the body 3 is made of brass material, which utilizes the high heat dissipation property of copper to improve the heat dissipation effect of the body 3.

[0038] Further, as a preferred embodiment, the cooling channel 35 is located below the positioning groove 31 to improve the heat elimination of the area where the positioning groove 31 is located.

[0039] Further, as a preferred embodiment, the long side of the positioning groove 31 is parallel to the long side of the body 3.

[0040] The above merely describes preferred embodiments of the present application, and is not intended to limit the implementation and protection scope of the present application. For those skilled in the art, it should be understood that any equivalent substitutions and obvious changes made according to the content of the present application description and drawings should be included in the protection scope of the present application.

Claims

1. A connecting piece limiting block, characterized in that, include: The main body has a positioning groove on its top for positioning the connecting piece, and a cooling channel inside the main body for the passage of a cold source.

2. The connecting piece limiting block according to claim 1, characterized in that, The cooling channel has a U-shaped structure.

3. The connecting piece limiting block according to claim 2, characterized in that, The side of the body has a cold source inlet and a cold source outlet that communicate with the cooling channel.

4. The connecting piece limiting block according to claim 1, characterized in that, The positioning groove is a rectangular groove and matches the connecting piece.

5. The connecting piece limiting block according to claim 4, characterized in that, The main body is a rectangular block, and the positioning groove is located on the top of the main body.

6. The connecting piece limiting block according to claim 5, characterized in that, The rectangular block has notches at all four corners.

7. The connecting piece limiting block according to claim 6, characterized in that, The notch is an arc-shaped notch.

8. The connecting piece limiting block according to claim 1, characterized in that, The main body is made of brass.

9. The connecting piece limiting block according to claim 1, characterized in that, The cooling channel is located below the positioning groove.

10. The connecting piece limiting block according to claim 5, characterized in that, The long side of the positioning groove is parallel to the long side of the body.

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