A repeatable injection battery top cover structure

Abstract

The utility model discloses a battery top cover structure of repeated liquid injection, including top cover sheet and install in the middle part of top cover sheet's explosion -proof subassembly, the positive pole and negative pole of the both sides of upper end face, the stop frame of bottom end, the positive pole and negative pole are respectively equipped with sealing washer and install after the stop frame on top cover sheet, and the center of positive pole has the through type injection channel that sets up along its axial direction, the upper portion of injection channel is equipped with rubber plug, and the top of rubber plug covers and welds the injection hole welding piece, and the middle part of injection hole welding piece has the through -hole that supplies injection needle to pass, and welds to the corresponding position department of top cover sheet. Thus, by the synergetic design of the injection channel of positive pole center, rubber plug and injection hole welding piece, after the injection of injection needle puncture, rubber plug restores the seal automatically, need not additional complex sealing operation, can realize safe, convenient secondary and multiple liquid supplement, has solved the problem of traditional structure's repeated liquid supplement or the sealing failure problem after liquid supplement, prolongs the service life of battery.

Description

Technical Field

[0001] This utility model relates to the field of power lithium battery technology, and in particular to a battery top cover structure that can be refilled with electrolyte. Background Technology

[0002] In the development of power lithium battery technology, the safety requirements of battery cells continue to rise. As a key component, the top cover's structural stability is directly related to the overall safety and performance of the power lithium battery.

[0003] Traditional battery top cover liquid injection structure design: the liquid injection hole is mostly directly opened on the top cover plate, which makes it difficult to seal after liquid injection and makes it difficult to achieve secondary and multiple liquid replenishment. If liquid is forced to be added, it will easily damage the sealing structure, causing problems such as leakage and cell performance degradation. At the same time, the assembly coordination of various components of traditional top covers is poor, affecting the overall protection and stability, and cannot meet the requirements of power lithium batteries for long life and high reliability. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a battery top cover structure that can be refilled with liquid.

[0005] This utility model proposes a refillable battery top cover structure, including a top cover sheet, an explosion-proof component installed in the middle of the top cover sheet, positive and negative terminals on both sides of the upper end face, and a stop frame at the bottom. The positive and negative terminals are respectively installed on the top cover sheet after passing through a sealing ring and the stop frame. The protruding end of the positive terminal is injection molded with a positive injection molding edging, and the protruding end of the negative terminal is injection molded with a negative injection molding edging. A through-type liquid injection channel is opened in the center of the positive terminal along its axial direction. A rubber stopper is installed on the upper part of the liquid injection channel. The top of the rubber stopper is covered with a liquid injection hole welding piece. The middle part of the liquid injection hole welding piece has a through hole for the liquid injection needle to pass through, and it is welded to the corresponding position of the top cover sheet.

[0006] Preferably, the inner wall of the injection channel is provided with annular anti-slip texture.

[0007] Preferably, the rubber stopper is made of EPDM (ethylene propylene diene monomer) material.

[0008] Preferably, the rubber stopper has a T-shaped stepped structure and is interference-fitted with the upper part of the injection channel.

[0009] Preferably, a metal reinforcing core is embedded in the top of the rubber stopper.

[0010] Preferably, the edge of the injection hole welding piece is provided with an annular guide groove to guide the electrolyte overflowing during injection to the external collection tank of the battery.

[0011] Preferably, a disc-shaped spring washer for absorbing vibration energy is provided between the stop frame and the top cover plate.

[0012] In summary, this utility model has the following beneficial effects: by utilizing the collaborative design of the liquid injection channel in the center of the positive electrode post, the rubber stopper, and the welding piece of the liquid injection hole, it simulates the self-sealing principle of an "IV drip bottle cap". After the liquid injection needle punctures and injects liquid, the rubber stopper automatically restores the seal. Without the need for additional complex sealing operations, it can achieve safe and convenient secondary and multiple liquid replenishment, solving the problem that traditional structures cannot be repeatedly replenished or that the seal fails after replenishment. It is suitable for battery maintenance and performance optimization needs and extends battery life.

[0013] The self-sealing rubber stopper and the auxiliary sealing of the injection hole welded plate, combined with the sealing ring and welding process, form a multi-layer sealing protection to effectively prevent battery leakage; the explosion-proof components (explosion-proof valve and explosion-proof patch) work together to release abnormal internal pressure in a timely manner, resist external risks, and improve the safety of power lithium battery use.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] Figure 1 The three-dimensional structure of the refillable battery top cover according to an embodiment of this utility model. Figure 1 ;

[0016] Figure 2 The three-dimensional structure of the refillable battery top cover according to an embodiment of this utility model. Figure 2 ;

[0017] Figure 3 This is an exploded view of the refillable battery top cover structure according to an embodiment of the present invention;

[0018] Figure 4 This is a cross-sectional view of the liquid injection channel of the top cover sheet in an embodiment of the present invention;

[0019] Figure 5 This is a cross-sectional view of the injection channel with a rubber stopper installed according to an embodiment of the present invention;

[0020] Figure 6 This is a cross-sectional view of the refillable battery top cover structure according to an embodiment of the present invention.

[0021] In the picture:

[0022] 1. Injection hole welding piece; 2. Rubber stopper; 3. Positive electrode injection molding edge banding; 4. Negative electrode injection molding edge banding; 5. Explosion-proof patch; 6. Top cover plate; 7. Explosion-proof valve; 8. Stop bracket; 9. Sealing ring; 10. Positive electrode post; 101. Injection channel; 11. Negative electrode post. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] like Figure 1-6 As shown, the battery top cover structure for refillable liquid filling proposed in this embodiment includes a top cover plate 6, an explosion-proof component installed in the middle of the top cover plate 6, positive electrode posts 10 and negative electrode posts 11 on both sides of the upper end face, and a stop frame 8 at the bottom. The positive electrode posts 10 and negative electrode posts 11 are respectively installed on the top cover plate 6 after passing through the sealing ring 9 and the stop frame 8. The protruding end of the positive electrode post 10 is injection molded with a positive electrode injection molding edge 3, and the protruding end of the negative electrode post 11 is injection molded with a negative electrode injection molding edge 4. A through-type liquid filling channel 101 is opened in the center of the positive electrode post 10 along its axial direction. A rubber stopper 2 is installed on the upper part of the liquid filling channel 101. The top of the rubber stopper 2 is covered with a liquid filling hole welding piece 1. The middle part of the liquid filling hole welding piece 1 is reserved with a through hole for the liquid filling needle to pass through, and is welded to the corresponding position of the top cover plate 6. During injection, the injection needle punctures the rubber stopper 2 and enters the injection channel 101. After injection, the rubber stopper 2 self-seals due to its elasticity (similar to the cap of an IV drip bottle; after the needle enters the stopper, the rubber can form a self-sealing structure. After the injection is completed, the injection needle can be removed without damaging the overall seal), thus enabling secondary and multiple injection processes.

[0025] Among them, the injection hole welding piece 1 is a stainless steel sheet with a central micro-hole of Φ1.5-2mm. The micro-hole serves as a puncture channel for the injection needle and also helps to adsorb residual electrolyte through the capillary effect of the micro-hole [referring to the spontaneous rise or fall of liquid in a narrow space (such as a capillary or the pores of a porous material due to surface tension, also known as capillary action], thus preventing corrosion of the inside of the top cover.

[0026] Thus, by utilizing the collaborative design of the injection channel 101 in the center of the positive electrode post 10, the rubber stopper 2, and the welding piece 1 of the injection hole, the self-sealing principle of "IV drip bottle cap" is simulated. After the injection needle punctures and injects liquid, the rubber stopper 2 automatically restores the seal. Without the need for additional complex sealing operations, safe and convenient secondary and multiple liquid replenishment can be achieved. This solves the problem that traditional structures cannot be repeatedly replenished or that the seal fails after replenishment. It adapts to the needs of battery maintenance and performance optimization and extends the battery life.

[0027] The rubber stopper 2 is self-sealing, and the injection hole welding piece 1 is auxiliary sealing. Combined with the sealing ring 9 and welding process, multiple sealing protections are constructed to effectively prevent battery leakage. The explosion-proof components (including the explosion-proof valve 7 and the explosion-proof patch 5) work together to release abnormal internal pressure in a timely manner, resist external risks, and improve the safety of power lithium battery use.

[0028] Furthermore, the inner wall of the injection channel 101 is provided with annular anti-slip texture (not shown in the figure). This enhances the friction of the rubber stopper 2 during assembly and prevents displacement of the rubber stopper 2 during injection.

[0029] Furthermore, the rubber stopper 2 is made of EPDM (ethylene propylene diene monomer) material, which provides excellent elasticity and sealing performance.

[0030] Specifically, the rubber stopper 2 has a T-shaped stepped structure and is interference-fitted with the upper part of the injection channel 101. A metal reinforcing core is embedded in the top of the rubber stopper 2 to enhance its self-sealing elastic recovery force after puncture.

[0031] In this embodiment, the edge of the injection hole welding piece 1 is provided with an annular guide groove (not shown in the figure) to guide the electrolyte overflowing during injection to the external collection tank of the battery.

[0032] Preferably, a disc-shaped spring washer is provided between the stop bracket 8 and the top cover plate 6 to absorb vibration energy, preventing leakage due to loosening between the pole and the sealing ring 9.

[0033] In a preferred embodiment, nano-grade fumed silica grease (0.1 mm thick) can be filled between the injection hole welding piece 1 and the rubber stopper 2 to isolate the electrolyte from direct contact with the rubber stopper 2 and delay the aging of EPDM rubber (accelerated life test shows that the aging rate of the rubber stopper 2 is reduced by 40% under grease protection).

[0034] It should be noted that by fixing the terminal post with injection molding edging, the stop bracket 8 and the sealing ring 9 work together to limit the position, thereby strengthening the connection stability between the terminal post and the top cover plate 6; the explosion-proof valve 7 is pre-welded and the explosion-proof patch 5 provides physical protection, thereby improving the overall impact resistance and abnormal pressure resistance of the top cover, and ensuring the structural safety of the power lithium battery under complex working conditions.

[0035] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] 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.

[0037] 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.

[0038] 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 refillable battery top cover structure, comprising a top cover sheet and an explosion-proof component installed in the middle of the top cover sheet, positive and negative terminals on both sides of the upper end face, and a stop frame at the bottom end, wherein the positive and negative terminals are respectively mounted on the top cover sheet after passing through a sealing ring and the stop frame, and the protruding end of the positive terminal has a positive injection-molded edge, and the protruding end of the negative terminal has a negative injection-molded edge, characterized in that, The positive electrode post has a through-type liquid injection channel along its axial direction at its center; a rubber stopper is installed on the upper part of the liquid injection channel, and the top of the rubber stopper is covered with a liquid injection hole welding piece. The middle part of the liquid injection hole welding piece has a through hole for the liquid injection needle to pass through, and it is welded to the corresponding position of the top cover piece.

2. The refillable battery top cover structure according to claim 1, characterized in that, The inner wall of the injection channel is provided with annular anti-slip texture.

3. The refillable battery top cover structure according to claim 1, characterized in that, The rubber stopper is made of EPDM (ethylene propylene diene monomer) material.

4. The refillable battery top cover structure according to claim 2, characterized in that, The rubber stopper has a T-shaped stepped structure and is interference-fitted with the upper part of the injection channel.

5. The refillable battery top cover structure according to claim 4, characterized in that, A metal reinforcing core is embedded in the top of the rubber stopper.

6. The refillable battery top cover structure according to claim 1, characterized in that, The edge of the injection hole welding piece is provided with an annular guide groove to guide the electrolyte overflowing during injection to the external collection tank of the battery.

7. The refillable battery top cover structure according to claim 1, characterized in that, A disc-shaped spring washer for absorbing vibration energy is provided between the stop bracket and the top cover plate.

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