Efficient opening and closing device for lithium battery shell

Abstract

The application discloses a lithium battery shell efficient opening and closing device and belongs to the technical field of lithium batteries. The device is provided with a shell, the top of the shell is provided with an opening, the opening contains a deformation bottom glue, the top of the deformation bottom glue is embedded into a middle locking seat, the middle locking seat is wrapped with an overall shell, the overall lifting frame is penetrated and provided with a bottom plate at the bottom, the upper surface of the bottom plate is attached to the lower surface of the deformation bottom glue, a spring is embedded between the overall lifting frame and the middle locking seat, the bottom plate drives the deformation bottom glue to separate from the opening to form a lithium supplement channel when the overall lifting frame is lifted, and the bottom plate presses the deformation bottom glue to the opening to restore the seal when the overall lifting frame is lowered. The application can be quickly opened and closed without professional breaking tools, and the seal can be repeatedly pressed after being opened.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more specifically to a high-efficiency opening and closing device for a lithium battery casing. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, lithium-ion batteries have become a core power source due to their high energy density and other advantages. However, their cycle life is a prominent issue: with the increase in charge-discharge cycles, lithium ions are irreversibly consumed due to side reactions such as lithium plating and SEI film thickening, leading to battery capacity decay, increased internal resistance, and ultimately, failure and disposal. Currently, commercially available lithium batteries generally adopt a fully sealed structure from the inside out, with the cell encapsulated within the casing and connected only to external circuitry via terminals. While this design ensures safety and chemical stability, it means that batteries with reduced cycle life cannot be repaired by adding lithium, requiring complete disposal and resulting in resource waste and increased operating costs.

[0003] In existing technologies, traditional sealing structures are mostly one-time designs, requiring specialized tools to open. This is complex and can easily damage the battery cells or cause safety issues such as electrolyte leakage and short circuits. Once opened, it is difficult to restore the original sealing performance. Some openable structures do not consider the special characteristics of lithium replenishment—lithium replenishment may involve the injection of high-voltage active lithium sources, requiring a high degree of airtightness between the casing and the top cover. Traditional sealing solutions such as single-layer rubber gaskets are prone to aging and failure after repeated disassembly and reassembly. In addition, existing opening mechanisms lack a coordinated design with the lithium replenishment process and do not integrate a linkage control design for "unlocking-lithium replenishment-seal maintenance." The operation is cumbersome and it is difficult to guarantee the positional accuracy after opening. Therefore, existing battery casing technology cannot meet the needs of lithium replenishment.

[0004] In summary, to address the need for battery cell repair through lithium replenishment after cycle life degradation, a new type of battery casing structure is urgently required: maintaining high sealing reliability during normal use, being able to be quickly opened after lifespan reduction to provide a safe lithium replenishment channel for the battery cell, and being able to be repeatedly pressed and sealed after opening.

[0005] Therefore, it is necessary to invent an efficient opening and closing device for lithium battery casings to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a high-efficiency opening and closing device for lithium battery casings, which avoids the drawbacks of traditional disposable fully sealed lithium battery structures. It does not require professional dismantling tools and avoids the defects of traditional single-layer rubber gasket sealing solutions. It integrates a linkage control design of "unlocking - lifting (simultaneous lithium replenishment) - sealing maintenance" to maintain high airtightness between the casing and the top cover.

[0007] To achieve the above objectives, the present invention provides the following technical solution: including a housing and a rubber ring, wherein the top of the housing is provided with an opening to accommodate the rubber ring being embedded, and a limit module base, a limit module, and a limit module cover are provided between the rubber ring and the top cover, the limit module including an elastic component, a columnar body, and an electrode post; an elastic component is provided between the electrode post and the columnar body; The bottom of the limit module base is provided with a through hole, and the edge of the through hole is provided with a washer groove. Both sides of the limit module base are provided with elastic components and buttons. The limit module base is provided with a pole post in the middle. The pole post and the buttons on both sides interfere with each other. The top and both sides of the top cover are provided with perforations, and the inside of the top cover is provided with an annular groove. The bottom diameter of the rubber ring is larger than the width of the limit module base.

[0008] Preferably, the limiting module is fitted between the limiting module base and the limiting module cover; the width of the limiting module is equal to the width of the groove inside the top cover.

[0009] Preferably, the limit module base, the limit module, and the limit module cover are connected by bolts.

[0010] Preferably, the bottom of the pole post is embedded with the top of the elastic component, and the bottom of the elastic component is in contact with the bottom upper surface of the limiting module base.

[0011] Preferably, the perforations on both sides of the top cover are provided with columnar bodies with limiting positions.

[0012] Preferably, the diameter of the perforations on both sides of the top cover is the same as the diameter of the button.

[0013] Preferably, the opening diameter at the top of the shell gradually decreases.

[0014] Preferably, a disc is provided at the bottom of the limiting module base, and the diameter of the disc is equal to the inner diameter of the bottom of the housing.

[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: The integrated elastic component, column (pole post), and button form an integrated reversible opening and closing mechanism of "press to unlock - lift to open - press back to close": In normal state, the elastic component pushes to keep it locked. Pressing the buttons on both sides moves the pole post down and releases the interlock. Then, lifting the column post drives the limit module and the base to move linearly along the guide path formed by the perforation of the top cover and the internal annular groove, so that the edge of the opening enters the groove of the top cover and is continuously pressed. The rubber ring maintains high airtightness and high sealing performance in the clamping and elastic deformation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is an exploded perspective view of the present invention; Figure 2 This is a cross-sectional view of the overall lifting frame of Embodiment 1 of the present invention before it is lifted. Figure 3 This is a cross-sectional view of the overall lifting frame after it has been lifted according to Embodiment 1 of the present invention; Explanation of reference numerals in the attached figures: 100. Housing; 200. Rubber ring; 300. Opening; 400. Top cover; 501. Limiting module base; 502. Limiting module; 503. Limiting module cover plate; 512. Elastic component; 522. Column; 532. Pole post; 800. Perforation; 901. Button; 1001. Overall housing; 1002. Overall lifting frame; 1003. Intermediate locking seat; 1004. Deformation base rubber; 1005. Pin; 1006. Fixing hole; 1016. First fixing hole; 1026. Second fixing hole; 1036. Third fixing hole; 1007. Base plate; 1008. Spring. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Example 1: The present invention provides, as follows Figure 1-1 The lithium battery casing high-efficiency opening and closing device shown in Figure 0 includes a casing 100 and a rubber ring 200. The top of the casing 100 is provided with an opening 300, which accommodates the rubber ring 200. The casing 100 carries and protects the battery cell and electrolyte. The opening 300 at the top is provided for maintenance and lithium replenishment.

[0020] The deformable underlayer 1004, as an elastic sealant with a circular front projection, is positioned between the opening 300 of the housing 100 and the intermediate locking seat 1003. The deformable underlayer 1004 achieves end-face sealing through its own elastic compression and withstands shear and compression deformation without instability during opening and closing. The inner edge of the opening 300 mates with the deformable underlayer 1004, achieving pre-sealing and uniform stress distribution on the opening 300 surface. The deformable underlayer 1004 is preferably perfluoroether rubber (FFKM). The reason for this choice is that FFKM's molecular chain contains almost no CH bonds, making it inert to most chemical media. It can withstand strong acids, strong alkalis, strong oxidants, and various organic solvents (such as ethers, ketones, esters, alcohols, and amines), exhibiting excellent stability against over 1600 chemicals. It also possesses good resistance to plasma and gas corrosion, making it suitable for strong oxidizing, highly polar, and oxygen- or fluorine-containing systems that may be encountered during battery maintenance, reducing the risk of swelling, aging, and failure.

[0021] Perfluoroelastomer (FFKM) rubber can be used for extended periods in environments up to 327°C, with even higher short-term temperature resistance. Even under constant temperature conditions of 316°C or intermittent high temperatures of 343°C, it maintains its elasticity without hardening or becoming brittle. In high-temperature compression set tests, the compression set rate of FFKM rubber can be controlled below 50% at 300°C, which is beneficial for the sealing surface to reliably return to its original position and maintain airtightness after repeated disassembly and high-temperature conditions.

[0022] The effect of using perfluoroether rubber FFKM in the deformation base 1004 is: good rebound after long-term compression, and excellent resistance to electrolyte and air tightness.

[0023] The deformation base adhesive 1004 has an embedded intermediate locking seat 1003 on top. The outer surface of the intermediate locking seat 1003 is covered by an integral shell 1001. The intermediate locking seat 1003 serves as the actuating body for sealing and locking. The intermediate locking seat 1003 is preferably made of aluminum alloy 6000 / 7000 series, because aluminum alloy 6000 / 7000 series is a heat-treatable strengthening alloy with significantly higher strength than 5000 / 1000 series. Among them, 7000 series has the highest strength in this group and is suitable for bearing structural loads caused by locking, lifting and vibration. In scenarios where weight reduction is required without excessively sacrificing strength, 6000 series provides a more balanced strength-to-weight ratio. At the same time, the body of aluminum alloy 6000 / 7000 series has good thermal conductivity, which helps to quickly dissipate the heat generated during lithium replenishment or use through the intermediate locking seat 1003, reducing heat concentration and the risk of thermal aging of the seal. Under the same weight, aluminum substrate is more conducive to heat diffusion and structural lightweighting than steel parts.

[0024] The outer surface of the intermediate locking seat 1003 mates with the overall housing 1001 to form the load-bearing and positioning boundary of the housing; the intermediate locking seat 1003 has a built-in sealing and guiding structure, which together with the deformation base 1004 forms a repeatable main sealing channel. The intermediate locking seat 1003 covers the deformation base 1004 and the intermediate locking seat 1003, forming the outer protective barrier of the device, and the intermediate locking seat 1003 provides linear guidance and a load-bearing platform for the overall lifting frame 1002.

[0025] The overall lifting frame 1002 is a key actuator for realizing the opening and closing actions of the device. It penetrates the deformable base 1004, the intermediate locking seat 1003, and the overall shell 1001. A base plate 1007 is provided at the bottom of the overall lifting frame 1002, and the upper surface of the base plate 1007 at the bottom of the overall lifting frame 1002 is in contact with the lower surface of the deformable base 1004. Under the action of external force, the overall lifting frame 1002 can realize the upward and downward movement, thereby driving the intermediate locking seat 1003 and the overall shell 1001 to move together, realizing the opening (lifting the intermediate locking seat 1003 and the overall shell 1001, separating the deformable base 1004 from the opening 300 of the shell 100 to form a lithium replenishment channel) and closing (lowering the intermediate locking seat 1003 and the overall shell 1001, making the deformable base 1004 fit with the opening 300 of the shell 100, restoring the seal) functions of the device. Meanwhile, it runs through other components, ensuring the coordination of the relative positions and movements of each component. A spring 1008 is embedded between the overall lifting frame 1002 and the intermediate locking seat 1003. As an elastic element, the spring 1008 absorbs the impact and vibration energy during the opening and closing process, reduces the impact stress and stick-slip wear between the deformation base rubber 1004 and the metal intermediate locking seat 1003, avoids failures such as lip curling and indentation caused by hard contact, and extends the life of the seal and guide components. It is particularly beneficial for working conditions that require multiple opening and closing, such as lithium replenishment.

[0026] The deformation base adhesive 1004, the intermediate locking seat 1003, and the overall housing 1001 are penetrated by the overall lifting frame 1002, and the overall lifting frame 1002, the intermediate locking seat 1003, and the overall housing 1001 are provided with a fixing hole 1006.

[0027] The fixing holes 1006 include a first fixing hole 1016, a second fixing hole 1026, and a third fixing hole 1036. The first fixing hole 1016 is disposed through the overall lifting frame 1002, the second fixing hole 1026 is disposed through the top of the intermediate locking seat 1003, and the third fixing hole 1036 is disposed through the overall housing 1001. The above three fixing holes cooperate with each other, and the overall lifting frame 1002, the intermediate locking seat 1003, and the overall housing 1001 are firmly connected together by inserting a pin 1005. When the device is opened, the pin 1005 can withstand a certain tensile force, ensuring that the overall lifting frame 1002 can smoothly lift the intermediate locking seat 1003 and the overall housing 1001 to form a lithium replenishment channel. The above scheme achieves high airtightness between the housing 100 and the overall housing 1001.

[0028] Based on the above assembly method, after the battery has reached a certain number of charge and discharge cycles, the top cover 400 can be opened for lithium replenishment. The structural design scheme of this embodiment is preferably suitable for the lithium replenishment method of lithium trifluoromethyl sulfinate developed by Fudan University.

[0029] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-efficiency opening and closing device for a lithium battery casing, characterized in that, The device has a housing with an opening at the top; the opening accommodates the embedded deformable base adhesive; a central locking seat is embedded in the top of the deformable base adhesive, and the outer surface of the central locking seat is covered by the overall housing; the deformable base adhesive, the central locking seat, and the overall housing are penetrated by an overall lifting frame; the bottom of the overall lifting frame has a base plate, the upper surface of which is in contact with the lower surface of the deformable base adhesive; the diameter of the base plate is smaller than the diameter at the maximum width of the deformable base adhesive; a spring is embedded between the overall lifting frame and the central locking seat, the spring is used to apply a downward force to the overall lifting frame to maintain a continuous seal between the deformable base adhesive and the opening, and the upward force applied to the overall lifting frame must overcome the spring force; The overall lifting frame, the intermediate locking seat, and the overall outer shell are provided with through fixing holes; the fixing holes include a first fixing hole, a second fixing hole, and a third fixing hole. The first fixing hole is provided through the overall lifting frame, the second fixing hole is provided through the top of the intermediate locking seat, and the third fixing hole is provided through the overall outer shell. The first fixing hole, the second fixing hole, and the third fixing hole are connected and fixed by a pin. The overall lifting frame is used to realize the upward and downward movement under the action of external force. When rising, the base plate drives the deformation base rubber to separate from the opening to form a lithium replenishment channel. When descending, the base plate presses the deformation base rubber against the opening to restore the seal.

2. The high-efficiency opening and closing device for a lithium battery casing according to claim 1, characterized in that, The front projection of the deformable primer is circular, and the deformable primer is an elastomer sealant.

3. The high-efficiency opening and closing device for a lithium battery casing according to claim 1, characterized in that, The deformation base material is perfluoroether rubber.

4. The high-efficiency opening and closing device for a lithium battery casing according to claim 1, characterized in that, The middle locking seat is made of aluminum alloy.

5. The high-efficiency opening and closing device for a lithium battery casing according to claim 1, characterized in that, The overall shell provides linear guidance and a load-bearing platform for the overall lifting frame.

6. The high-efficiency opening and closing device for a lithium battery casing according to claim 1, characterized in that, The bottom of the base plate is used to connect to the core tab of the battery cell.

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