Lithium battery liquid injection hole structure and lithium battery

By designing a flexible, bendable sealed sheet structure at the lithium battery injection hole, the problem of electrolyte leakage during lithium battery formation and aging is solved, achieving self-balancing of internal and external pressure, and improving the cell's electrolyte retention and operational safety.

CN223598992UActive Publication Date: 2025-11-25XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202423141602.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-11-25
Estimated Expiration
2034-12-19

AI Technical Summary

Technical Problem

During the formation and aging process of lithium batteries, the electrolyte may be ejected from the injection hole under positive pressure, resulting in insufficient electrolyte retention in the cell and potential operational safety hazards.

Method used

A lithium battery electrolyte injection hole structure is designed, which adopts a sealing sheet composed of several fan-shaped plates, which is fixed to the substrate by a fastener. The sealing sheet elastically bends under pressure to open the electrolyte injection hole, and resets to close after the pressure is removed. The elasticity and sealing performance of the rubber material are used to self-balance the internal and external pressure.

Benefits of technology

It effectively reduces electrolyte ejection, increases cell electrolyte retention, reduces operational safety hazards, and ensures the safety and efficiency of the electrolyte injection and formation processes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a liquid injection hole structure of a lithium battery, which belongs to the field of lithium batteries and comprises a liquid injection hole formed in a substrate; the sealing piece is arranged in the liquid injection hole and seals the liquid injection hole; the fixing piece is arranged on the base plate and locks the setting position of the sealing piece; the sealing piece is formed by splicing a plurality of piece bodies, at least one piece body is fan-shaped, one end of the piece body is fixed to the edge of the liquid injection hole through a fixing piece, the other end of the piece body extends towards the middle of the liquid injection hole and shields the liquid injection hole, and the piece body is pressed to enable the free end of the piece body to be elastically bent and enable the liquid injection hole to be opened. According to the utility model, the sealing piece is arranged in the liquid injection hole, so that the sealing piece is elastically bent to open the liquid injection hole under the pressed condition and is reset to seal the liquid injection hole after the pressed condition is lost, the internal and external pressure of the lithium battery can be self-balanced, and the influence on the battery caused by the fact that electrolyte is sprayed out due to overlarge internal pressure after the aluminum shell battery is formed is reduced; and the potential safety hazard to operators when the electrolyte is sprayed out under the internal pressure of the battery cell in the process of taking out the formation nail after aging is reduced.
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Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a lithium battery liquid injection hole structure and lithium battery. BACKGROUND

[0002] Lithium battery usually carries out secondary liquid injection after aging for a period of time in high temperature interval after formation, and then welds sealing aluminum sheet. In order to prevent the water absorption of the battery during aging, the prior art usually adopts formation nail to temporarily seal the battery during the aging stage, and the formation nail is removed after the aging is completed to facilitate secondary liquid injection. For example, a power battery liquid injection hole sealing structure disclosed in Chinese patent CN113904072B seals the liquid injection hole by setting a sealing nail in interference fit.

[0003] However, gas may be produced during the aging process of the lithium battery, especially the battery with certain lithium supplement agent, which may cause the electrolyte to be sprayed out of the liquid injection hole under the positive pressure in the battery during the formation and aging process, resulting in insufficient electrolyte retention in the battery and affecting the performance of the battery. The electrolyte spraying phenomenon when removing the formation nail may cause safety hazards during the operation of the operator. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a lithium battery liquid injection hole structure and lithium battery to solve the problem that the electrolyte may be sprayed out of the liquid injection hole under the positive pressure in the battery during the formation and aging process of the battery and the electrolyte spraying when removing the formation nail.

[0005] The technical scheme of the utility model is implemented as follows: the utility model provides a lithium battery liquid injection hole structure, which comprises a substrate, a liquid injection hole is formed in the substrate, a closure piece is arranged in the liquid injection hole and seals the liquid injection hole, and a fixing member is arranged on the substrate and locks the arrangement position of the closure piece. The closure piece is formed by splicing a plurality of pieces, at least one piece is fan-shaped, one end of the piece is fixed to the edge of the liquid injection hole through the fixing member, the other end of the piece extends towards the middle part of the liquid injection hole and shields the liquid injection hole, and the free end of the piece is elastically bent under pressure and opens the liquid injection hole.

[0006] Preferably, a groove is formed in the substrate, the liquid injection hole is formed at the bottom of the groove, and the fixing member is arranged in the groove.

[0007] More preferably, the fixing member is annular, the fixing member is lapped on the edge of the closure piece, and the edge of the closure piece is clamped between the bottom surface of the groove and the fixing member; a through hole is formed in the fixing member, and the through hole is communicated between the groove and the liquid injection hole.

[0008] More preferably, the end surface of the fixing member contacting the closure piece is provided with an annular clamping groove, and the edge of the closure piece is arranged in the clamping groove.

[0009] Further preferably, the outer diameter of the closing sheet is greater than the hole diameter of the liquid injection hole, and the outer diameter of the closing sheet is not greater than the inner diameter of the groove.

[0010] On the basis of the above technical scheme, preferably, the closing sheet is composed of a plurality of fan-shaped sheet bodies, the free ends of the sheet bodies abut against each other and close the liquid injection hole, or the sheet bodies are simultaneously pressed to cause the free ends to simultaneously elastically bend and open the liquid injection hole.

[0011] Further preferably, the shapes and sizes of the plurality of sheet bodies are completely same.

[0012] Further preferably, the number of the sheet bodies is 6-10.

[0013] Further preferably, the two sides of the fan shape of each sheet body are inclined surfaces, so that the side surfaces of the adjacent sheet bodies are overlapped.

[0014] On the other hand, the utility model also provides a lithium battery which adopts the above-mentioned liquid injection hole structure of lithium battery.

[0015] The utility model discloses a kind of liquid injection hole structure of lithium battery and lithium battery relative to prior art have following beneficial effects:

[0016] (1) the utility model discloses in liquid injection hole is provided with closing sheet, it is opened liquid injection hole under the condition of being pressed to bend elastically, and reset to close liquid injection hole after losing the effect of being pressed, it can self-balance the pressure inside and outside lithium battery, reduce the influence of electrolyte spouting to battery after aluminum shell battery formation, simultaneously reduce the security risk of electrolyte spouting when electrolyte is spouted to operating personnel in the process of taking out formation nail after aging, and the liquid injection hole structure can effectively reduce the phenomenon that electrolyte is overflowed when battery is formed on formation cabinet, to reduce the influence of electrolyte overflow to formation machine.

[0017] (2) the closing sheet of the utility model is composed of a plurality of fan-shaped sheet bodies with same shape and size, and the side surfaces of each sheet body are overlapped through inclined surface, which ensures that the plurality of sheet bodies abut against each other to form closing sheet, and has sufficient sealing effect on liquid injection hole, without affecting the elastic bending of each sheet body under pressure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a perspective view of the liquid injection hole structure of the utility model;

[0020] Figure 2 It is the cross section view of the liquid injection hole structure of the utility model;

[0021] Figure 3 It is the cross section explosion view of the liquid injection hole structure of the utility model;

[0022] Figure 4 It is the cross section view of the opening state of the liquid injection hole structure of the utility model;

[0023] Figure 5 It is the plan view of the closure piece of the utility model;

[0024] Figure 6 It is the cross section view of the closure piece of the utility model at A-A line.

[0025] In the drawing: 1, base plate; 101, liquid injection hole; 102, groove; 2, closure piece; 21, piece body; 201, inclined surface; 3, fixing part; 301, through hole; 302, clamping groove. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with 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. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] As shown in Figure 1 combination Figure 4 , a kind of liquid injection hole structure of lithium battery of the utility model, including base plate 1, closure piece 2 and fixing part 3.

[0028] Among them, liquid injection hole 101 is set on base plate 1. Base plate 1 usually refers to the cover plate or bottom plate of battery.

[0029] The closing sheet 2 is arranged in the liquid injection hole 101 and closes the liquid injection hole 101. The closing sheet 2 is spliced by a plurality of sheet bodies 21; the closing sheet 2 adopts a rubber sheet, specifically, the rubber material is polyurethane (PU), which has good elasticity, wear resistance, corrosion resistance, temperature resistance, and also has good oxygen resistance and water resistance. Because the resilience of the closing sheet 2 is needed, and the closing sheet 2 also needs to have good sealing and closing ability after resilience, the closing sheet 2 needs to have a certain thickness to splice the sheet bodies 21 tightly, and therefore metal sheets are not recommended. At least one sheet body 21 is a fan-shaped sheet body, one end of the sheet body 21 is fixed to the edge of the liquid injection hole 101 through a fixing member 3, and the other end of the sheet body 21 extends towards the middle of the liquid injection hole 101 and shields the liquid injection hole 101. Because the sheet body 21 is fan-shaped, the sheet body 21 will be elastically bent at the free end when pressed and the liquid injection hole 101 will be opened, and the sheet body 21 will return to the original position after the pressure disappears.

[0030] The fixing member 3 is arranged on the base plate 1 and locks the arrangement position of the closing sheet 2.

[0031] When the liquid injection is performed on the battery cell under negative pressure, the closing sheet 2 is bent downward under the action of the large negative pressure and the liquid injection hole 101 is opened. Similarly, when the battery cell is vacuumized or the forming nail is inserted, the closing sheet 2 is bent upward under the action of the vacuum pump and the liquid injection hole 101 is unblocked. When the liquid injection or vacuumization is completed, the closing sheet 2 quickly returns to the original position and prevents the electrolyte from overflowing. When the forming nail is removed after the high-temperature aging of the battery cell is completed, the closing sheet 2 instantaneously returns to the original position, preventing the electrolyte from being jetted out under the action of the positive pressure in the battery cell due to the gas generated during the aging, thereby improving the liquid retention of the battery cell and reducing the safety hazard of the liquid jet to the operator.

[0032] In Figure 2 In a preferred embodiment shown in FIG. 1, a groove 102 is formed in the base plate 1, the liquid injection hole 101 is formed at the bottom of the groove 102, and the fixing member 3 is arranged in the groove 102. The fixing member 3 is fixed in the groove 102 by laser welding. The fixing member 3 is not recommended to be fixed in the groove 102 by a buckle structure, because the buckle structure has weak resistance to pressure and cannot avoid the problem that the fixing member 3 is pressed too hard and separated from the groove 102. The groove 102 is generally formed towards the outside of the battery.

[0033] In Figure 3 In a preferred embodiment shown in FIG. 1, the fixing member 3 is annular, the fixing member 3 overlaps the edge of the closing sheet 2 and clamps the edge of the closing sheet 2 between the bottom surface of the groove 102 and the fixing member 3; a through hole 301 is formed in the fixing member 3 and communicates between the groove 102 and the liquid injection hole 101. The fixing member 3 is similar to a hoop, and the fixing member 3 fixes the closing sheet 2 in the groove 102 by pressing the edge of the closing sheet 2.

[0034] InFigure 3 In a preferred embodiment shown in the figure, the fixing member 3 has a ring-shaped clamping groove 302 on the end surface contacting the closure sheet 2, and the edge of the closure sheet 2 is arranged in the clamping groove 302. The closure sheet 2 can be fixed in the clamping groove 302 by epoxy resin glue, and the closure sheet 2 is clamped between the bottom surface of the groove 102 and the fixing member 3 by slight deformation. The thickness of the sheet body 21 depends on the type of battery cell to be adapted, and in general, the thickness of the sheet body 21 is slightly greater than the depth of the clamping groove 302 of the fixing member 3, the depth of the clamping groove 302 is 2 / 3 of the total thickness of the fixing member 3, and the total thickness of the fixing member 3 is 2 / 3 of the depth of the groove 102 on the base plate 1, and a margin is left for the convenience of the final sealing top welding;

[0035] In Figure 3 In a preferred embodiment shown in the figure, the outer diameter of the closure sheet 2 is greater than the hole diameter of the liquid injection hole 101, and the outer diameter of the closure sheet 2 is not greater than the inner diameter of the groove 102, so that the closure sheet 2 can effectively close the liquid injection hole 101, and when the sheet body 21 is bent, the fixed end can be stably fixed by the fixing member 3.

[0036] In Figure 5 In a preferred embodiment shown in the figure, the closure sheet 2 is circular, and when the closure sheet 2 has only one sheet body 21 which is a sector, as shown in the lower right of Figure 5 In order to make the closure sheet 2 have better self-closing ability, the closure sheet 2 is spliced by a plurality of sector-shaped sheet bodies 21, the free ends of the sheet bodies 21 abut each other and close the liquid injection hole 101, or the sheet bodies 21 are simultaneously pressed to cause the free ends to simultaneously elastically bend and open the liquid injection hole 101.

[0037] In Figure 5 In a preferred embodiment shown in the figure, the shapes and sizes of the plurality of sheet bodies 21 are completely the same, for example, as shown in the upper left and upper right of Figure 5 However, only part of the sheet bodies 21 can have the same shape and size, for example, as shown in the lower left, and the self-closing ability of the closure sheet 2 will not be affected.

[0038] In Figure 5 In a preferred embodiment shown in the figure, the number of sheet bodies 21 is 6-10. If the number of sheet bodies 21 is too small, the arc of the sector will be too large, which will affect the bending ability of the free end of the sheet body 21, and therefore, the number of sheet bodies 21 can be adjusted according to the pressure generated inside the battery, so as to control the sheet body 21 to bend only after reaching the preset pressure.

[0039] In Figure 6 In a preferred embodiment shown in the figure, the two sides of the sector-shaped sheet body 21 are inclined surfaces 201, so that the side surfaces of adjacent sheet bodies 21 abut each other. This design ensures that when the plurality of sheet bodies 21 abut each other to form the closure sheet 2, they have sufficient sealing effect on the liquid injection hole 101, and at the same time, do not affect the elastic bending of the sheet bodies 21 under pressure.

[0040] As Figure 1 The utility model discloses a lithium battery, adopts the liquid injection hole structure of any one of the embodiment.

[0041] The above only is the preferred implementation manner of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement, improvement etc. that are made within the spirit and principle of the utility model should include in the protection scope of the utility model.

Claims

1. A lithium battery liquid injection hole structure, characterized in that, The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure.

2. The structure of the liquid injection hole of the lithium battery according to claim 1, characterized in that: The application relates to a lithium battery liquid injection hole structure.

3. The structure of the liquid injection hole of the lithium battery according to claim 2, characterized in that: The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure.

4. The lithium battery liquid injection hole structure according to claim 3, characterized in that: The application relates to a lithium battery liquid injection hole structure.

5. The structure of the liquid injection hole of the lithium battery according to claim 3, characterized in that: The application relates to a lithium battery liquid injection hole structure.

6. The structure of a lithium battery liquid injection hole according to claim 1, characterized in that: The application relates to a lithium battery liquid injection hole structure.

7. The lithium battery liquid injection hole structure according to claim 6, characterized in that: The application relates to a lithium battery liquid injection hole structure.

8. The lithium battery liquid injection hole structure according to claim 7, characterized in that: The application relates to a lithium battery liquid injection hole structure.

9. The structure of the liquid injection hole of the lithium battery according to claim 7, characterized in that: The application relates to a lithium battery liquid injection hole structure.

10. A lithium battery, characterized by: The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. The application relates to a lithium battery liquid injection hole structure. 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Citation Information

Patent Citations

  • A sealing structure for a power battery injection hole

    CN113904072B