Novel short-circuit-proof lithium battery pole piece connecting structure

Abstract

The utility model discloses a novel lithium battery pole piece connecting structure of preventing short circuit, especially relates to the field of lithium battery, including lithium battery ontology, the top fixed mounting of lithium battery ontology has the top cover, the top of top cover is provided with a pair of left and right arrangement's welding piece, the front and back both sides of top cover are provided with the pole piece ontology respectively, the inside of pole piece ontology is provided with a pair of left and right arrangement's pair of pole lug. When the stud moves downward, the sliding block is driven to slide downward along the guide rail two by the bearing, the moving block and the baffle are driven to move outward by the connecting rod, and the stud moves upward, the baffle can be driven to move inward, when the position of baffle is adjusted, the corresponding pole piece ontology is inserted into the inside of a pair of L type guide block, and the sliding pole piece ontology is until it is against the baffle surface, the two pole lug of this pole piece ontology is located the corresponding welding piece surface suitable position at this moment, thereby reaches the effect of positioning before pole lug welding, and then reaches the effect of pole piece ontology preventing short circuit.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery technology, specifically a novel lithium battery electrode connection structure that prevents short circuits. Background Technology

[0002] Lithium-ion batteries, as a type of rechargeable battery that uses lithium ions as the conductive carrier, have become a core energy carrier in consumer electronics, new energy vehicles, and energy storage systems due to their significant advantages such as high energy density, long cycle life, and low self-discharge rate. Their basic working principle involves the storage and release of electrical energy through the insertion and extraction of lithium ions between the positive and negative electrodes. The electrodes, as the core sites for lithium ion migration and charge conduction, have their structural design and connection quality directly determining the battery's performance and safety.

[0003] Chinese patent CN220138617U discloses a lithium battery electrode connection structure. This patented technology, through the arrangement of electrode sheets, tabs, top covers, plastic parts, pressure frames, and clamping structures, allows for the welding of electrode tabs to the top cover of the battery. First, the tabs are placed against the welding sheet on the back of the top cover. Then, the pressure frame is placed inside the plastic part and fixed by the clamping structure. At this point, the electrode tabs are pressed tightly against the welding sheet. When welding the tabs using an ultrasonic welding machine, it is less likely to result in incomplete welds, ensuring a larger welding area and improving the welding yield. This ensures a sufficiently large welding area and good welding quality, thereby guaranteeing the current flow of the finished battery. However, in existing structures, the tabs are die-cut from the electrode sheet. Slight dimensional deviations may occur during the die-cutting process, and the tabs themselves are thin. During the manual placement of the electrode sheet and top cover into the fixture, the tabs are prone to shifting due to their own weight, external vibration, or operational errors, causing the tabs to fail to accurately occupy the effective welding area of ​​the welding sheet. Even if the mounting frame is positioned by using the positioning rod and positioning hole, it can only press the tab as a whole. It cannot accurately guide the initial position of the tab before pressing. If the tab offset is large, the tab may exceed the range of the welding piece or come into contact with the adjacent welding piece, which may cause a short circuit risk. Utility Model Content

[0004] The purpose of this invention is to provide a novel lithium battery electrode connection structure that prevents short circuits, achieving the effect of positioning the electrode tabs before welding and preventing short circuits caused by electrode tab misalignment.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A novel short-circuit-proof lithium battery electrode connection structure includes a lithium battery body, a top cover fixedly mounted on the top of the lithium battery body, a pair of welding tabs arranged horizontally on the top of the top cover, electrode bodies respectively arranged on the front and rear sides of the top cover, a pair of electrode tabs arranged horizontally on the inner side of the electrode bodies, a connecting mechanism provided on the top of the top cover, the connecting mechanism including a connecting frame, positioning mechanisms respectively arranged on the front and rear sides of the connecting frame, the positioning mechanism including a connecting box fixedly connected to the connecting frame, a movable block that can move back and forth slidably connected inside the connecting box, a smooth baffle fixedly connected to the outer side of the movable block; a pair of left-right mirror-symmetrical L-shaped guide blocks fixedly connected to the front and rear sides of the connecting frame.

[0007] As a further improvement of this utility model: guide rails are fixedly connected to the left and right sides of the inside of the connecting box, and the guide rails are slidably connected to the moving block.

[0008] As a further embodiment of this utility model: a stud is threaded onto the top of the connecting box, and a sliding block is connected to the bottom of the stud via a bearing. The bottom of the stud is fixedly connected to the outer ring of the bearing, and the outer ring of the bearing is fixedly connected to the sliding block. A connecting rod is hinged to the outer side of the sliding block via a hinge, and the other end of the connecting rod is hinged to a moving block via a hinge. A second guide rail is fixedly connected to the inner side of the connecting box, and the second guide rail is slidably connected to the sliding block.

[0009] As a further embodiment of this utility model: a fixed frame is fixedly connected to the front and rear sides of the inner side of the connecting frame, a connecting rod is slidably connected to the top of the fixed frame, the connecting rod passes through the surface of the fixed frame and a pressure plate is fixedly connected to the bottom of the connecting rod, an elastic anti-slip sheet is provided at the bottom of the pressure plate, a compression spring is fixedly connected to the top of the pressure plate, the top of the compression spring is fixedly connected to the fixed frame, and guide rails are fixedly connected to the left and right sides of the fixed frame, and the guide rails are slidably connected to the pressure plate respectively.

[0010] As a further embodiment of this utility model: the connecting frame has mounting openings on its front and rear sides, the bottom of the connecting frame has a notch adapted to the top surface of the top cover, and the connecting frame has sliding grooves on its left and right sides respectively. A support spring is fixedly connected to the inner side of the sliding groove, and a positioning block that is slidably connected to the sliding groove is fixedly connected to the other side of the support spring. A guide rod is fixedly connected to the outer side of the positioning block, and the outer side of the guide rod passes through the corresponding sliding groove and is slidably connected to the sliding groove; the top cover has positioning grooves on its left and right sides respectively.

[0011] As a further improvement of this utility model, the inner surface of the positioning block has an arc-shaped design that gradually shortens from top to bottom.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This novel short-circuit-preventing lithium battery electrode connection structure works as follows: when the stud moves downward, it drives the sliding block to slide downward along the guide rail 2 via the bearing, and the connecting rod drives the moving block and baffle to move outward. Similarly, when the stud moves upward, it drives the baffle to move inward. After adjusting the position of the baffle, the corresponding electrode body is inserted into the interior of a pair of L-shaped guide blocks, and the sliding electrode body is moved until it abuts against the surface of the baffle. At this time, the two tabs of the electrode body are located in the appropriate position on the surface of the corresponding welding piece. This achieves the effect of positioning the tabs before welding, thereby achieving the effect of preventing short circuits in the electrode body.

[0014] In addition, this novel lithium battery electrode connection structure for short circuit prevention allows the connecting rod on the corresponding side to be pulled up before the electrode tabs are installed. The connecting rod drives the pressure plate to move upward and compresses the pressure spring. After the electrode tabs contact the welding piece, the connecting rod is slowly released, and the pressure plate slides downward along the guide rail under the rebound of the pressure spring until the anti-slip piece at the bottom of the pressure plate presses against the surface of a pair of electrode tabs on the same side, thus fixing the electrode tabs and preventing them from shifting during the welding process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a novel lithium battery electrode connection structure designed to prevent short circuits.

[0016] Figure 2 This is a schematic diagram of the overall structure splitting in a novel short-circuit-proof lithium battery electrode connection structure;

[0017] Figure 3 This is a schematic cross-sectional view of the connection mechanism in a novel short-circuit-proof lithium battery electrode connection structure.

[0018] Figure 4 This is a cross-sectional schematic diagram of the positioning mechanism in a novel short-circuit-proof lithium battery electrode connection structure.

[0019] In the diagram: 10. Lithium battery body; 11. Top cover; 12. Electrode body; 13. Electrode tab; 14. Welding piece; 20. Connecting mechanism; 201. Connecting frame; 202. Sliding groove; 203. Support spring; 204. Positioning block; 205. Guide rod; 206. Positioning groove; 30. Positioning mechanism; 301. Connecting box; 302. Moving block; 303. Baffle; 304. Guide rail one; 305. Stud; 306. Sliding block; 307. Connecting rod; 308. Guide rail two; 309. L-shaped guide block; 310. Fixing frame; 311. Connecting rod; 312. Pressure plate; 313. Compression spring. Detailed Implementation

[0020] like Figure 1 , Figure 2As shown, a novel short-circuit-proof lithium battery electrode connection structure includes a lithium battery body 10. A top cover 11 is fixedly installed on the top of the lithium battery body 10. A pair of welding tabs 14 arranged on the left and right are provided on the top of the top cover 11. The top of the top cover 11 is provided with an explosion-proof valve and a liquid injection hole. Electrode bodies 12 are respectively provided on the front and rear sides of the top cover 11. A pair of electrode tabs 13 arranged on the left and right are provided on the inner side of the electrode body 12 (the above is consistent with the referenced document).

[0021] refer to Figures 1-3 The top of the top cover 11 is provided with a connecting mechanism 20, which includes a connecting frame 201. The connecting frame 201 has installation openings on its front and rear sides. The bottom of the connecting frame 201 has a notch adapted to the top surface of the top cover 11. The left and right sides of the inside of the connecting frame 201 are respectively provided with sliding grooves 202. A support spring 203 is fixedly connected to the inner side of the sliding groove 202. A positioning block 204 that is slidably connected to the sliding groove 202 is fixedly connected to the other side of the support spring 203. A guide rod 205 is fixedly connected to the outer side of the positioning block 204. The outer side of the guide rod 205 passes through the corresponding sliding groove 202 and is slidably connected to the sliding groove 202. The left and right sides of the top cover 11 are respectively provided with positioning grooves 206.

[0022] Preferably, the inner surface of the positioning block 204 has an arc-shaped design that gradually shortens from top to bottom.

[0023] In use, the connecting mechanism 20 is first installed on the top of the top cover 11. During installation, the connecting frame 201 is inserted into the top of the top cover 11, causing the positioning block 204 to contact the boundary of the top cover 11. The contact force causes the positioning block 204 to slide into the sliding groove 202, while simultaneously compressing the support spring 203, until the bottom notch of the connecting frame 201 is fully inserted into the top of the top cover 11, aligning the positioning groove 206 with the positioning block 204. The support spring 203 then rebounds, causing the positioning block 204 to move inward and insert into the positioning groove 206, thus completing the installation of the connecting mechanism 20 on the top of the top cover 11. Furthermore, the positioning block 204 can be disengaged from the positioning groove 206 by pulling the guide rods 205 on both sides, and the connecting frame 201 can be lifted upwards to disassemble the connecting mechanism 20.

[0024] When welding the tab 13, it is necessary to move the tab 13 to the surface of the welding piece 14. However, since the initial position of the tab 13 cannot be accurately guided before it is pressed, the tab 13 has a large offset. This may cause the tab 13 to extend beyond the range of the welding piece 14 or to contact the adjacent welding piece 14, which may lead to a short circuit risk. Therefore, a positioning mechanism 30 is proposed.

[0025] refer to Figure 1 , Figure 2, Figure 4 The connecting frame 201 is provided with positioning mechanisms 30 on its front and rear sides respectively. The positioning mechanism 30 includes a connecting box 301 fixedly connected to the connecting frame 201. The connecting box 301 is slidably connected to a moving block 302 that can move back and forth. The moving block 302 is fixedly connected to a smooth baffle 303 on its outer side. The connecting frame 201 is also fixedly connected with a pair of left and right mirror-symmetrical L-shaped guide blocks 309 on its front and rear sides respectively.

[0026] Preferably, guide rails 304 are fixedly connected to the left and right sides of the interior of the connecting box 301, and the guide rails 304 are slidably connected to the moving block 302; thereby achieving the effect of guiding the moving block 302 and the baffle 303 when they move.

[0027] Specifically, a stud 305 is threaded onto the top of the connecting box 301, and a sliding block 306 is connected to the bottom of the stud 305 via a bearing. The bottom of the stud 305 is fixedly connected to the outer ring of the bearing, and the outer ring of the bearing is fixedly connected to the sliding block 306. A connecting rod 307 is hinged to the outer side of the sliding block 306 via a hinge, and the other end of the connecting rod 307 is hinged to the moving block 302 via a hinge. A second guide rail 308 is fixedly connected to the inner side of the connecting box 301, and the second guide rail 308 is slidably connected to the sliding block 306.

[0028] After the connecting mechanism 20 is installed, the position of the baffle 303 can be adjusted according to the contact position between the electrode tab 13 and the welding piece 14. During adjustment, by rotating the stud 305, the stud 305 rotates and moves upward or downward. When the stud 305 moves downward, it drives the sliding block 306 to slide downward along the guide rail 308 through the bearing, and drives the moving block 302 and the baffle 303 to move outward through the connecting rod 307. Similarly, when the stud 305 moves upward, it can drive the baffle 303 to move inward. When the baffle is adjusted... After the plate 303 is positioned, insert the left and right sides of the corresponding electrode body 12 into the inner side of a pair of L-shaped guide blocks 309 on the same side, and slide the electrode body 12 horizontally toward the top cover 11 until the electrode body 12 and the inner side surface abut against the surface of the baffle 303. At this time, the two tabs 13 of the electrode body 12 are located at the appropriate position on the surface of the corresponding welding piece 14 and the tabs 13 are in contact with the surface of the welding piece 14; thereby achieving the effect of positioning the tabs 13 before welding, and thus achieving the effect of preventing short circuit of the electrode body 12.

[0029] Furthermore, a fixed frame 310 is fixedly connected to the front and rear sides of the inner side of the connecting frame 201, and a connecting rod 311 is slidably connected to the top of the fixed frame 310. The connecting rod 311 passes through the surface of the fixed frame 310 and a pressure plate 312 is fixedly connected to the bottom of the connecting rod 311. An elastic anti-slip sheet is provided at the bottom of the pressure plate 312. A compression spring 313 is fixedly connected to the top of the pressure plate 312. The top of the compression spring 313 is fixedly connected to the fixed frame 310. Guide rails three are fixedly connected to the left and right sides of the fixed frame 310, and the guide rails three are slidably connected to the pressure plate 312.

[0030] Before installing the tab 13, first pull up the connecting rod 311 on the corresponding side. The connecting rod 311 drives the pressure plate 312 to move upward and compresses the pressure spring 313. After the tab 13 contacts the welding piece 14, slowly release the connecting rod 311. Under the rebound of the pressure spring 313, the pressure plate 312 slides downward along the guide rail until the anti-slip plate at the bottom of the pressure plate 312 presses against the surface of the pair of tabs 13 on the same side, thus fixing the tab 13 and preventing the tab 13 from shifting during the welding process. At the same time, the contact between the anti-slip plate of elastic material and the tab 13 can prevent the tab 13 from deforming due to the pressure. After the tab 13 is welded to the welding piece 14, the connecting mechanism 20 can be removed by unlocking the connecting mechanism 20 and then lifting the connecting frame 201 for the next use.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A novel short-circuit-proof lithium battery electrode connection structure, comprising a lithium battery body (10), a top cover (11) fixedly mounted on the top of the lithium battery body (10), a pair of welding tabs (14) arranged left and right on the top of the top cover (11), electrode bodies (12) respectively arranged on the front and rear sides of the top cover (11), and a pair of electrode tabs (13) arranged left and right on the inner side of the electrode bodies (12), characterized in that, The top of the top cover (11) is provided with a connecting mechanism (20). The connecting mechanism (20) includes a connecting frame (201). The front and rear sides of the connecting frame (201) are respectively provided with positioning mechanisms (30). The positioning mechanism (30) includes a connecting box (301) fixedly connected to the connecting frame (201). The interior of the connecting box (301) is slidably connected with a movable block (302) that can move back and forth. The outer side of the movable block (302) is fixedly connected with a smooth baffle (303). The front and rear sides of the connecting frame (201) are respectively fixedly connected with a pair of left and right mirror-symmetrical L-shaped guide blocks (309).

2. The novel short-circuit-proof lithium battery electrode connection structure according to claim 1, characterized in that, The connecting box (301) has guide rails (304) fixedly connected to its left and right sides respectively, and the guide rails (304) are slidably connected to the moving block (302).

3. The novel short-circuit-proof lithium battery electrode connection structure according to claim 1, characterized in that, The top of the connecting box (301) is threaded with a stud (305), and the bottom of the stud (305) is connected to a sliding block (306) via a bearing. The bottom of the stud (305) is fixedly connected to the outer ring of the bearing, and the outer ring of the bearing is fixedly connected to the sliding block (306). The outer side of the sliding block (306) is hinged to a connecting rod (307) via a hinge, and the other end of the connecting rod (307) is hinged to a moving block (302) via a hinge. The inner side of the connecting box (301) is fixedly connected to a second guide rail (308), and the second guide rail (308) is slidably connected to the sliding block (306).

4. The novel short-circuit-proof lithium battery electrode connection structure according to claim 1, characterized in that, The connecting frame (201) is fixedly connected to the front and rear sides of the interior, and a connecting rod (311) is slidably connected to the top of the fixed frame (310). The connecting rod (311) passes through the surface of the fixed frame (310) and a pressure plate (312) is fixedly connected to the bottom of the connecting rod (311). An elastic anti-slip sheet is provided at the bottom of the pressure plate (312). A compression spring (313) is fixedly connected to the top of the pressure plate (312). The top of the compression spring (313) is fixedly connected to the fixed frame (310). Guide rails are fixedly connected to the left and right sides of the fixed frame (310). The guide rails are slidably connected to the pressure plate (312).

5. A novel short-circuit-proof lithium battery electrode connection structure according to claim 1, characterized in that, The connecting frame (201) has mounting openings on its front and rear sides. The bottom of the connecting frame (201) has a notch adapted to the top surface of the top cover (11). The connecting frame (201) has sliding grooves (202) on its left and right sides. A support spring (203) is fixedly connected to the inside of the sliding groove (202). A positioning block (204) that is slidably connected to the sliding groove (202) is fixedly connected to the other side of the support spring (203). A guide rod (205) is fixedly connected to the outside of the positioning block (204). The outside of the guide rod (205) passes through the corresponding sliding groove (202) and is slidably connected to the sliding groove (202). The top cover (11) has positioning grooves (206) on its left and right sides.

6. A novel short-circuit-proof lithium battery electrode connection structure according to claim 5, characterized in that, The inner surface of the positioning block (204) has an arc-shaped design that gradually shortens from top to bottom.

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