Connection structure of battery cell top cover pole

Abstract

The utility model discloses a connection structure of a battery cell top cover pole, which comprises a top cover plate, and two mounting holes are arranged on the top cover plate. According to the utility model, the upper pole and the lower pole are connected through the two mounting holes, the pouring hole of the upper pole is butted with the pouring groove of the lower pole, and then grouting operation is carried out through the pouring hole of the upper pole so as to fill a connecting cavity between the upper pole and the lower pole, and the grouting material is a liquid high-conductivity metal material, preferably liquid aluminum; after normal pouring and sealing are completed, liquid metal poured inside needs to be cooled and formed, finally metal overflowing from the pouring holes of the upper pole is milled through CNC machining, connection between the upper pole and the top cover plate and between the lower pole and the top cover plate is achieved, firmness between the top cover poles is improved, the failure risk is reduced, and the machining and manufacturing cost is reduced. In addition, during irrigation, the two irrigation holes can be irrigated through the irrigation assembly at the same time, and the irrigation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field especially relates to a kind of connection structure of battery cell top cover pole. BACKGROUND

[0002] Battery cell is the core component of lithium ion battery, it is responsible for storing and providing electric energy. Top cover as the closed component of battery cell, not only play the role of protecting the internal structure of battery cell, such as preventing electrolyte leakage, external substance invasion and mechanical damage etc., also undertake the heavy responsibility of connection with external circuit. Pole is the component for connecting external wire on top cover, usually made of metal material with good conductivity, and its design and material selection directly affect the safety and conductivity efficiency of battery. In the manufacturing process of battery cell, the connection technology of top cover and pole is crucial, which is directly related to the overall performance and reliability of battery.

[0003] The current internal connection mode of battery cell top cover pole mainly adopts friction welding mode, this connection mode generates heat by high-speed rotating pole, makes pole and top cover material melt and fuse on contact surface, to realize close connection, friction welding process has the advantages of simple operation, high connection strength and relatively fast production efficiency, so it is widely used in battery cell manufacturing field, in specific application, friction welding can meet the basic demand of battery cell top cover pole connection, ensure the normal use of battery.

[0004] However, the friction welding connection mode in prior art also has obvious problems and disadvantages. Due to the principle limitation of friction welding, the connection quality is affected by various factors, such as accurate control of welding speed, pressure, temperature and other parameters. In actual application, these factors may cause unreliable risk between pole and top cover, such as insufficient connection strength, crack or gap defects in connection surface. These problems not only reduce the conductivity efficiency of battery cell, increase the internal resistance and heat generation of battery, but also may cause internal short circuit, liquid leakage and other safety hazards of battery. In extreme cases, these problems may even cause battery explosion and other serious consequences, which pose a threat to personnel and property safety. Therefore, a reliable battery cell top cover pole connection structure is needed to improve the overall performance and safety of battery. SUMMARY

[0005] The utility model aims at providing a kind of connection structure of battery cell top cover pole, to solve the above insufficient place in prior art.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of connection structure of top cover pole of electric core, including top cover plate, two mounting holes are set in the top cover plate, the inside of two mounting holes is provided with upper pole and lower pole respectively, pouring hole is set in the upper pole, pouring groove is set in the top of lower pole, and the top of pouring groove is communicated with the bottom of pouring hole.

[0007] As further description of the above technical solution: the shape inside the pouring groove is set as a circular truncated cone with narrow top and wide bottom.

[0008] As further description of the above technical solution: pouring assembly is provided above the top cover plate, the pouring assembly includes a liquid injection dish and two injection tubes, two liquid injection ports are set in the bottom of the liquid injection dish, two injection ports are communicated with the top of two injection tubes, the bottom of two injection tubes is arranged above two pouring holes respectively and does not contact with pouring hole, and the inner diameter of the bottom of injection tube is less than the inner diameter of pouring hole.

[0009] As further description of the above technical solution: support frame is fixedly installed at the bottom of injection tube, the support frame is inserted into the side wall of two upper poles, and the support frame is set at 45° with the horizontal direction of top cover plate.

[0010] As further description of the above technical solution: the side wall of injection tube is provided with a thermal insulation layer.

[0011] As further description of the above technical solution: heating pipe assembly is fixedly installed at the side wall of injection tube, and the heating pipe assembly is arranged at the tail position of the side wall of injection tube.

[0012] The utility model discloses a kind of connection structure of top cover pole of electric core. With the following beneficial effects: the utility model first connects upper pole and lower pole by two mounting holes, the pouring hole of upper pole is docked with the pouring groove of lower pole, then carries out grouting operation by the pouring hole of upper pole, to fill the connecting cavity between upper and lower poles, the material of grouting is liquid high-conductivity metal material, preferably liquid aluminum, after normal grouting sealing is finished, need to wait inside grouting liquid metal cooling forming, finally, by CNC processing milling, the metal overflowed in the pouring hole of upper pole is removed, then the connection between upper pole and lower pole and top cover plate is realized, the firmness between top cover pole is increased, failure risk is reduced, processing manufacturing cost is reduced, and when grouting, two pouring holes can be grouted simultaneously by pouring assembly, grouting efficiency is increased.

[0013] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, rather than for limiting the present disclosure.

[0014] This application file provides an overview of various implementations or examples of the technology described in this disclosure and is not a comprehensive disclosure of all the scope or all the features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 A whole three-dimensional structure schematic diagram of a connection structure of an electrode core top cover pole is provided for the utility model;

[0016] Fig. 2 A sectional structure schematic diagram is provided for the utility model;

[0017] Fig. 3 A sectional exploded structure schematic diagram is provided for the utility model;

[0018] Fig. 4 A three-dimensional structure schematic diagram of the second embodiment of the utility model is provided;

[0019] Fig. 5 A top view structure schematic diagram of the second embodiment of the utility model is provided;

[0020] Fig. 6 A sectional structure schematic diagram of the utility model is provided for the injection pipe side wall setting heat preservation layer.

[0021] LEGEND:

[0022] 1, top cover plate; 2, upper pole; 3, lower pole; 4, pouring hole; 5, pouring groove; 6, mounting hole; 7, support frame; 8, heating pipe assembly; 9, injection pipe; 10, liquid injection dish; 11, heat preservation layer; 12, liquid injection port. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0024] Embodiment 1

[0025] REFERENCE Figs. 1-3The utility model provides a kind of connection structure of cell top cover pole, including top cover plate 1, two mounting holes 6 are set on the top cover plate 1, and the inside of two mounting holes 6 is provided with upper pole 2 and lower pole 3 respectively, pouring hole 4 is set on the upper pole 2, pouring groove 5 is set in the top end of lower pole 3, and the top end of pouring groove 5 is communicated with the bottom end of pouring hole 4;First, upper pole 2 and lower pole 3 are connected by two mounting holes 6, the pouring hole 4 of upper pole 2 is butted with the pouring groove 5 of lower pole 3, then pouring operation is carried out through the pouring hole 4 of upper pole 2, to fill the connecting cavity between upper and lower poles 3, the material of pouring is liquid high-conductivity metal material, preferably liquid aluminum, after normal pouring sealing is completed, internal pouring liquid metal needs to be cooled and formed, finally, the metal overflowed in the pouring hole 4 of upper pole 2 is milled by CNC, so that the connection between upper pole 2 and lower pole 3 and top cover plate 1 is realized, the firmness between top cover pole is increased, the failure risk is reduced, and the processing manufacturing cost is reduced.

[0026] As a preferred technical solution of the embodiment, the shape inside the pouring groove 5 is set as a circular truncated cone with narrow top and wide bottom; the cross-sectional structure of the pouring groove 5 of the lower pole 3 is designed as a trapezoid, which can increase the overall structural strength of the pouring body. In the design of the pouring body, the trapezoidal cross-sectional structure can increase the bottom area, so that the pouring body can more effectively disperse the pressure to a larger area when subjected to vertical pressure, reducing the pressure on the unit area, thereby enhancing the overall structural strength.

[0027] Embodiment 2

[0028] The embodiment is implemented on the basis of the above-mentioned embodiment 1, and refers to Figs. 4-6 , the top cover plate 1 is provided with a pouring assembly above, the pouring assembly includes a liquid injection dish 10 and two injection pipes 9, two liquid injection openings 12 are set at the bottom end of the liquid injection dish 10, the two liquid injection openings 12 are communicated and connected with the top ends of the two injection pipes 9, the bottom ends of the two injection pipes 9 are respectively arranged above the two pouring holes 4 and do not contact the pouring holes 4, and the inner diameter of the bottom end of the injection pipe 9 is smaller than the inner diameter of the pouring hole 4; Considering that there are two groups of electrodes on the top cover plate 1 that need to be connected with the top cover plate 1 during pouring operation, it is necessary to pour twice, pouring is carried out through the liquid injection dish 10 of the pouring assembly, and liquid aluminum flows downward into the pouring hole 4 through the injection pipe 9, which realizes pouring of the pouring hole 4 above the two upper poles 2 at the same time, and increases the pouring efficiency.

[0029] As the preferred technical scheme of the embodiment, the bottom end of the injection pipe 9 is fixedly provided with a support frame 7, the support frame 7 is inserted into the side wall of the two upper pole columns 2, and the support frame 7 is arranged at an angle of 45° with the horizontal direction of the top cover plate 1. Compared with the arrangement that the support frame 7 is parallel to the top cover plate 1, the arrangement that the support frame 7 is arranged at an angle of 45° with the horizontal direction can further increase the stability of the support frame 7, prevent the support frame 7 and the injection pipe 9 from tilting, and will not affect the observation of the watering situation of the watering hole 4 by the worker, so that the watering operation can be stopped in time.

[0030] As the preferred technical scheme of the embodiment, the side wall of the injection pipe 9 is provided with a heat preservation layer 11. Since the melting point of the watered metal is high, in order to prevent cooling during the injection process, the heat loss of the molten metal can be reduced by the heat preservation layer 11, so that the watered molten metal can flow smoothly into the inside of the watering hole 4.

[0031] As the preferred technical scheme of the embodiment, the side wall of the injection pipe 9 is fixedly provided with a heating pipe assembly 8, and the heating pipe assembly 8 is arranged at the tail position of the side wall of the injection pipe 9. The heating pipe assembly 8 is a prior art, and will not be described in detail. The function of the heating pipe assembly 8 is to appropriately heat the injection pipe 9, and form a double protection with the heat preservation layer 11, so that the watered molten metal can flow smoothly into the inside of the watering hole 4.

[0032] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A connecting structure of a cell top cover pole, comprising a top cover plate (1), two mounting holes (6) are formed on the top cover plate (1), characterized in that, The inner part of the two mounting holes (6) is respectively provided with an upper pole (2) and a lower pole (3), the upper pole (2) is provided with a pouring hole (4), the top end of the lower pole (3) is provided with a pouring groove (5), and the top end of the pouring groove (5) is communicated with the bottom end of the pouring hole (4).

2. The connecting structure of the cell top cover pole according to claim 1, characterized in that, The shape of the pouring groove (5) is a circular truncated cone with the top narrow and the bottom wide.

3. The connecting structure of the cell top cover pole according to claim 1, characterized in that, The top cover plate (1) is provided with a pouring assembly above, the pouring assembly comprises an injection tray (10) and two injection pipes (9), the bottom end of the injection tray (10) is provided with two injection ports (12), the two injection ports (12) are communicated with the top end of the two injection pipes (9), the bottom end of the two injection pipes (9) is respectively arranged above the two pouring holes (4) and does not contact with the pouring holes (4), and the inner diameter of the bottom end of the injection pipe (9) is smaller than the inner diameter of the pouring hole (4).

4. The connecting structure of the cell top cover pole according to claim 3, characterized in that, The bottom end of the injection pipe (9) is fixedly provided with a support frame (7), the support frame (7) is inserted into the side wall of the two upper poles (2), and the support frame (7) is arranged at 45° with the horizontal direction of the top cover plate (1).

5. The connecting structure of the cell top cover pole according to claim 3, characterized in that, The side wall of the injection pipe (9) is provided with a heat preservation layer (11).

6. The connection structure of the cell top cover pole according to claim 3, characterized in that, The side wall of the injection pipe (9) is fixedly provided with a heating pipe assembly (8), and the heating pipe assembly (8) is arranged at the tail position of the side wall of the injection pipe (9).

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