Lithium battery top cover structure

Abstract

The utility model provides a lithium battery top cover structure, which relates to the technical field of lithium batteries, and comprises a nail-shaped electrode, a top cover sheet, a stop frame and a connecting sheet, the top cover sheet and the stop frame are stacked up and down and are both provided with holes for the electrode to pass through, the electrode penetrates from the top of the top cover sheet to the lower part of the stop frame and protrudes out of the lower part of the stop frame, and the connecting sheet is connected with the top cover sheet. An annular groove is formed in the side edge of the portion, protruding out of the lower portion of the stop frame, of the electrode, the portion, corresponding to the electrode, protruding out of the stop frame is sleeved with the connecting piece, the annular groove is located in the face, away from the stop frame, of the connecting piece, and a wafer is inserted into the annular groove for clamping; according to the top cover structure, the electrode can be fastened in the whole top cover structure through the matching between the wafer and the electrode, the clamping between the electrode and the wafer can avoid the safety of battery operation caused by the falling of a welding spot, and the safety and the stability of the battery can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium batteries, and in particular to a lithium battery top cover structure. Background Technology

[0002] New energy is part of my country's strategic development goals and plays a dominant role in the power sector. Among them, lithium batteries are the most prominent in the new energy field. Common lithium batteries include cylindrical batteries and prismatic batteries. The electrodes of cylindrical batteries are at both ends of the battery, while the electrodes of prismatic batteries are on the same side. Prismatic batteries use a battery top cover structure to seal the top of the battery. The top cover contains the electrodes and connecting pieces that connect to the electrodes. Usually, the electrodes are inserted from the top of the top cover to the bottom of the top cover and welded to the connecting pieces so that the electrodes can conduct electricity. However, the electrodes may detach from the weld due to the vibration of the entire battery, which may lead to damage to the entire battery and affect the safety of battery use. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a lithium battery top cover structure to solve the problem of potential welding detachment between the electrodes and connecting pieces.

[0004] Based on the technical problems existing in the background art, this utility model proposes a lithium battery top cover structure, including a nail-shaped electrode, a top cover piece, a stop frame, and a connecting piece. The top cover piece and the stop frame are stacked one on top of the other, and both are provided with holes for the electrode to pass through. The electrode passes through from the top of the top cover piece to the bottom of the stop frame and protrudes from the bottom of the stop frame. An annular groove is provided on the side of the part of the electrode protruding from the bottom of the stop frame. The connecting piece is sleeved on the part of the electrode protruding from the stop frame, and the annular groove is located on the side of the connecting piece away from the stop frame. The annular groove is secured by inserting a circular piece.

[0005] Preferably, an insulating ring is sandwiched between the electrode and the top cover plate.

[0006] Preferably, the portion of the electrode located within the hole of the top cover plate has an interlayer between it and the hole, the electrode is fitted with a sealing ring and located within the interlayer and abuts against the bottom surface of the insulating ring, and the bottom of the sealing ring is on the same plane as the stop bracket.

[0007] Preferably, the connecting piece is provided with a circular hole for attaching an electrode, and the electrode passes through the end of the circular hole near the stop frame and exits the end of the circular hole away from the stop frame.

[0008] Preferably, the upper surface of the connecting piece protrudes around the circular hole. When the electrode is in contact with the lower surface of the stop, the circular hole and the hole of the stop are on the same plane, and an annular groove is formed between the electrode and the lower part of the connecting piece.

[0009] Preferably, the disc is formed by bending a metal strip into a corresponding annular groove, and the two ends of the metal strip are welded together to form the disc.

[0010] Preferably, each electrode is connected to a connecting piece.

[0011] Preferably, the stop frame is provided with an air guide groove in the middle, and the top cover is provided with an explosion-proof valve that matches the air guide groove.

[0012] Compared with the prior art, the lithium battery top cover structure proposed in this utility model adopts the above-mentioned technical solution and achieves the following technical effects:

[0013] This invention uses the cooperation between the disc and the electrode to secure the electrode within the entire top cover structure. The locking between the electrode and the disc can prevent the solder joint from falling off, thus ensuring battery safety and improving battery safety and stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the separation structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the installation structure of this utility model.

[0016] In the diagram: 1. Electrode; 2. Top cover plate; 3. Stop bracket; 4. Connecting plate; 11. Annular groove; 5. Circular plate; 6. Insulating ring; 7. Sealing ring; 41. Circular hole; 12. Annular groove; 31. Air guide groove; 21. Explosion-proof valve. Detailed Implementation

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] Example

[0020] Please refer to Figures 1-2 This utility model proposes a lithium battery top cover structure, including a nail-shaped electrode 1, a top cover plate 2, a stop bracket 3, and a connecting piece 4. The top cover plate 2 and the stop bracket 3 are stacked vertically. The stop bracket 3 is used to install the battery housing. Typically, the upper surface area of ​​the stop bracket 3 is smaller than the area of ​​the top cover plate 2. Both the top cover plate 2 and the stop bracket 3 are provided with holes for the electrode 1 to pass through. Normally, there are two holes, corresponding to the positive and negative electrodes respectively. The electrode 1 passes through from the top of the top cover plate 2 to the bottom of the stop bracket 3 and protrudes below the stop bracket 3. Since the electrode 1 is nail-shaped, the diameter of the electrode cap of the electrode 1 needs to be larger than the diameter of the hole in the top cover plate 2. When the electrode 1 is installed, it can be aligned with the top cover. The upper end of the plate 2 is abutted and limited. The side of the part of the electrode 1 protruding below the stop frame 3 is provided with an annular groove 11. The connecting plate 4 is sleeved on the part of the electrode 1 protruding from the stop frame 3 and the annular groove 11 is located on the side of the connecting plate 4 away from the stop frame 3. The annular groove 11 is secured by inserting a circular piece 5. At this time, a clamping layer is formed between the electrode cap of the electrode 1 and the circular piece 5, which can fix the top cover plate 2, the stop frame 3 and the connecting plate 4 in the clamping layer. Since the annular groove 11 and the circular piece 5 are secured and limited, the circular piece 5 does not rely on the welding effect to play a limiting role. Even if the circular piece 5 is detached from the weld, it can prevent the electrode 1 from falling off through its own securing effect.

[0021] In a specific embodiment, refer to Figure 1 , Figure 2 An insulating ring 6 is sandwiched between electrode 1 and top cover plate 2. The insulating ring 6 can prevent electrical conduction between electrode 1 and top cover plate 2.

[0022] In a specific embodiment, refer to Figure 1 , Figure 2 The portion of electrode 1 located within the hole of the top cover plate 2 has an interlayer between it and the hole. Electrode 1 is fitted with a sealing ring 7 and is located within the interlayer, abutting against the bottom surface of the insulating ring 6. The bottom of the sealing ring 7 is on the same plane as the stop frame 3. In this design, the sealing ring 7 not only seals the interlayer between electrode 1 and the top cover plate 2, but also provides insulation, preventing direct contact between electrode 1 and the top cover plate 2 and avoiding electrical conductivity.

[0023] In a specific embodiment, refer to Figure 1 , Figure 2 The connecting piece 4 is provided with a circular hole 41 for fitting the electrode 1. The electrode 1 passes through the circular hole 41 from one end near the stop frame 3 to the other end away from the stop frame 3. In this solution, the connecting piece 4 is used to connect with the electrode roll inside the battery. The circular piece 5 is located below the connecting piece 4. The outer diameter of the circular piece 5 is larger than the diameter of the circular hole 41. When the circular piece 5 is installed in the circular groove, it can limit the lower part of the connecting piece.

[0024] In a specific embodiment, refer to Figure 1 , Figure 2 The upper surface of the connecting piece 4 protrudes around the circular hole 41. When the electrode 1 is in contact with the lower surface of the stop frame 3, the circular hole 41 and the hole of the stop frame 3 are on the same plane, and an annular groove 12 is formed between the electrode 1 and the lower part of the connecting piece 4. In this solution, after the circular hole 41 of the connecting piece 4 protrudes, a groove will be formed on the lower surface around the circular hole 41. When the circular piece 5 is installed in the circular groove, if it moves, it will abut against the connecting piece 4, which can prevent the circular piece 5 from falling off and improve the stability effect.

[0025] In a specific embodiment, refer to Figure 1 , Figure 2 The circular piece 5 is formed by bending a metal strip corresponding to the annular groove 11. The two ends of the metal strip are welded to form the circular piece 5. In this solution, the circular piece 5 is formed by bending a metal strip. Alternatively, it can be formed by welding two semi-circular pieces 5 or multiple arc-shaped pieces. After the metal strip is bent, its two ends are connected by welding to form an annular circular piece 5, which can prevent the original piece from falling off.

[0026] In a specific embodiment, refer to Figure 1 , Figure 2 Each electrode 1 corresponds to a connecting piece 4 for connection.

[0027] In a specific embodiment, refer to Figure 1 , Figure 2 The stop frame 3 is provided with a gas guide groove 31 in the middle, and the top cover plate 2 is provided with an explosion-proof valve 21 that matches the gas guide groove 31. In this solution, the gas guide groove 31 is used to deal with the situation of battery short circuit. When the battery is short-circuited, the gas in the battery will be guided to the explosion-proof valve 21 through the gas guide groove 31, causing the explosion-proof valve 21 to rupture and avoiding the explosion of the entire battery.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium battery top cover structure, characterized in that, The device includes a nail-shaped electrode (1), a top cover plate (2), a stop frame (3), and a connecting plate (4). The top cover plate (2) and the stop frame (3) are stacked on top of each other and both have holes for the electrode (1) to pass through. The electrode (1) passes through the top of the top cover plate (2) to the bottom of the stop frame (3) and protrudes from the bottom of the stop frame (3). An annular groove (11) is provided on the side of the part of the electrode (1) that protrudes from the bottom of the stop frame (3). The connecting plate (4) is sleeved on the part of the electrode (1) that protrudes from the stop frame (3) and the annular groove (11) is located on the side of the connecting plate (4) away from the stop frame (3). The annular groove (11) is secured by inserting a round piece (5).

2. The lithium battery top cover structure according to claim 1, characterized in that, An insulating ring (6) is sandwiched between the electrode (1) and the top cover plate (2).

3. The lithium battery top cover structure according to claim 2, characterized in that, The portion of electrode (1) located inside the hole of the top cover plate (2) has an interlayer between it and the hole. Electrode (1) is fitted with a sealing ring (7) and is located inside the interlayer and abuts against the bottom surface of the insulating ring (6). The bottom of the sealing ring (7) is on the same plane as the stop frame (3).

4. The lithium battery top cover structure according to claim 1, characterized in that, The connecting piece (4) is provided with a round hole (41) for attaching the electrode (1). The electrode (1) passes through the round hole (41) from one end near the stop frame (3) to the other end away from the stop frame (3).

5. The lithium battery top cover structure according to claim 4, characterized in that, The upper surface of the connecting piece (4) protrudes around the round hole (41). When the electrode (1) is in contact with the lower surface of the stop (3), the round hole (41) and the hole of the stop (3) are on the same plane, and an annular groove (12) is formed between the electrode (1) and the lower part of the connecting piece (4).

6. The lithium battery top cover structure according to claim 1, characterized in that, The disc (5) is formed by bending a metal strip into a corresponding annular groove (11), and the two ends of the metal strip are welded together to form the disc (5).

7. The lithium battery top cover structure according to claim 1, characterized in that, Each electrode (1) corresponds to a connecting piece (4) for connection.

8. The lithium battery top cover structure according to claim 1, characterized in that, The stop frame (3) is provided with an air guide groove (31) in the middle, and the top cover plate (2) is provided with an explosion-proof valve (21) that matches the air guide groove (31).

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