Battery cell top cover and battery cell

Abstract

The utility model provides a kind of top cover of battery and battery, belong to battery field, including the liquid injection hole being opened in cover plate;Shell covers the end of liquid injection hole towards battery interior;Sliding plate is set in shell and moves in shell along the vertical direction of cover plate surface;Elastic member is set between the end surface of sliding plate towards battery interior and shell inner wall;Sealing ring is sleeved in liquid injection hole;Shell is opened with lattice hole on the outer circumferential wall of the direction of movement of sliding plate;Elastic member is in slack state, and sealing ring abuts the end surface edge of sliding plate towards battery exterior.The utility model sets up the sliding plate of elastic movement in liquid injection hole to close liquid injection hole, and sets up sealing ring to abut sliding plate outer surface on the outside of sliding plate, when liquid injection hole is injected, can press and move away sliding plate and connect liquid injection hole, and after completing liquid injection, sliding plate is rebounded to abut sealing ring and forms sealing structure, can effectively block the gas production in battery from discharging from liquid injection hole, also will not produce the case of top cover damage.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a battery cell top cover and a battery cell. Background Technology

[0002] In the production of lithium-ion batteries, electrolyte filling is one of the core processes. Traditional lithium-ion battery manufacturing processes involve multiple electrolyte fillings before the filling port is sealed with sealing pins. Before welding, sealing nails are typically used to plug the filling port. This process involves frequent insertion and removal of the nails, which can introduce foreign objects and affect cell performance. Furthermore, the process of electrolyte seeping into the electrode pores after injection is slow; if the electrolyte does not promptly wet the electrode interior after filling, there is a risk of leakage. Chinese patent CN220830092U discloses a battery cell, battery, and electrical device, which features a one-way spring-loaded tab inside the filling port. During filling, the tab springs open and connects to the filling port; after filling, the tab springs back and seals the filling port. However, this design cannot prevent problems when there is excessive gas inside the battery cell. This gas may force the tab open and release gas, damaging the tab and causing leakage into the cell. Utility Model Content

[0003] In view of this, the present invention proposes a cell top cover and a cell to solve the problem that when the liquid injection port is sealed with a spring clip, it is difficult to avoid excessive gas production inside the battery cell. In such cases, the gas production may force the spring clip to release gas, causing damage to the spring clip and leakage of the cell.

[0004] The technical solution of this utility model is implemented as follows: This utility model provides a battery cell top cover, including a cover plate with an injection hole; a housing, disposed on the end face of the cover plate facing the inside of the battery cell and covering the end of the injection hole facing the inside of the battery cell; a sliding plate, disposed inside the housing and moving within the housing along the vertical direction of the cover plate surface; an elastic element, disposed between the end face of the sliding plate facing the inside of the battery cell and the inner wall of the housing; and a sealing ring, fitted inside the injection hole; wherein, the outer peripheral wall of the housing surrounding the moving direction of the sliding plate has a grid hole; when the elastic element is in a relaxed state, the sealing ring abuts against the edge of the end face of the sliding plate facing the outside of the battery cell.

[0005] Based on the above technical solutions, preferably, the cover plate includes a first plate body located on the side of the cover plate facing the outside of the battery cell; and a second plate body laid on the plate surface of the first plate body facing the inside of the battery cell; wherein, the first plate body has an injection hole, the second plate body has a through hole, the through hole is aligned with the injection hole, and the end of the cover facing the outside of the battery cell is fitted into the through hole.

[0006] Even more preferably, the inner diameter of the injection hole is larger than the inner diameter of the through hole.

[0007] In a further preferred embodiment, a flange is provided at the end of the injection hole facing the outside of the cell, and the flange reduces the diameter of the injection hole; a sealing ring is sandwiched between the flange and the second plate.

[0008] Even more preferably, the inner diameter of the narrowed injection hole is not greater than the inner diameter of the through hole.

[0009] Even more preferably, the thickness of the second plate is less than that of the first plate.

[0010] Based on the above technical solutions, preferably, the cross-sectional shape of the skateboard along its direction of movement is triangular or trapezoidal.

[0011] Based on the above technical solutions, preferably, when the elastic element is in a relaxed state, the surface of the slide plate facing the outside of the battery cell does not protrude from the surface of the cover plate facing the outside of the battery cell.

[0012] Based on the above technical solutions, preferably, the height of the grid holes on the outer peripheral wall of the cover is not greater than the length of the elastic element in the relaxed state.

[0013] On the other hand, this utility model also provides a battery cell that uses the aforementioned battery cell top cover.

[0014] The battery cell top cover and battery cell of this utility model have the following advantages over the prior art:

[0015] (1) The present invention provides a sliding plate that moves elastically inside the injection hole to seal the injection hole, and a sealing ring is provided on the outside of the sliding plate to abut against the outer surface of the sliding plate. When liquid is injected into the injection hole, the sliding plate can be pushed to move away and connect the injection hole. After the liquid is injected, the sliding plate rebounds to abut against the sealing ring to form a sealing structure, which can effectively prevent the gas generated inside the cell from being discharged from the injection hole, and will not cause damage to the top cover.

[0016] (2) The slide plate of this utility model is conical or conical-cylindrical, so that the inclined surface of the cone and the sealing ring form an effective and tight elastic sealing structure, and can effectively disperse the outward squeezing force of the gas generated inside the battery cell on the slide plate, so as to avoid damage to the slide plate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the battery cell top cover of this utility model;

[0019] Figure 2This is a perspective view of the battery cell top cover of this utility model from another angle;

[0020] Figure 3 This is a perspective view of the housing of this utility model;

[0021] Figure 4 This is a partial side sectional view of the top cover of the battery cell of this utility model.

[0022] In the figure: 1. Cover plate; 11. First plate; 12. Second plate; 13. Flange; 101. Injection hole; 102. Through hole; 2. Cover; 3. Slide plate; 4. Elastic element; 5. Sealing ring. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0024] like Figure 1 As shown, combined with Figure 2 , Figure 3 and Figure 4 The present invention provides a battery cell top cover, comprising a cover plate 1, a housing 2, a sliding plate 3, an elastic element 4, and a sealing ring 5.

[0025] The cover plate 1 has a liquid injection hole 101. The cover plate 1 is placed on the top of the battery cell casing, and the cover plate 1 also has a terminal hole and is equipped with an explosion-proof valve.

[0026] The cover 2 is disposed on the end face of the cover plate 1 facing the inside of the cell and covers the end of the injection hole 101 facing the inside of the cell. The outer peripheral wall of the cover 2 surrounding the moving direction of the slide plate 3 is provided with grid holes. The function of the grid holes is to guide the flow so that the electrolyte injected through the injection hole 101 can enter the inside of the cell casing.

[0027] The slide plate 3 is set inside the cover 2 and moves within the cover 2 in a direction perpendicular to the surface of the cover plate 1.

[0028] The elastic element 4 is positioned between the end face of the slide plate 3 facing the inside of the battery cell and the inner wall of the casing 2. The elastic element 4 can be a spring.

[0029] The sealing ring 5 is fitted inside the injection hole 101. The sealing ring 5 is a rubber ring. When the elastic element 4 is in a relaxed state, the sealing ring 5 abuts against the edge of the end face of the slide plate 3 facing the outside of the cell, so that the sealing ring 5 and the slide plate 3 form an effective sealing structure. Even if gas is generated inside the cell, it flows to the inner end of the injection hole 101 and exerts an outward ejection force on the slide plate 3. Since the sealing ring 5 abuts against the edge of the upper surface of the slide plate 3, the sealing ring 5 locks the slide plate 3 so that it cannot move, thus keeping the injection hole 101 closed.

[0030] When the above technical solution is adopted, in the initial state, the elastic element 4 is relaxed, and the upper surface of the slide plate 3 abuts against the sealing ring 5, at which time the injection hole 101 is closed; when injection is performed, the injection head is inserted into the injection hole 101 and pushes the slide plate 3 downward to move it downward. At this time, the elastic element 4 is compressed, and the injection hole 101 connects the injection head and the inside of the cell; after the injection is completed, the injection head is withdrawn from the injection hole 101, the elastic element 4 rebounds and drives the slide plate 3 to reset, and the injection hole 101 is closed again.

[0031] exist Figure 4 In a preferred embodiment shown, the cover plate 1 includes a first plate 11 and a second plate 12.

[0032] The first plate 11 is a plain aluminum plate. The first plate 11 is located on the side of the cover plate 1 facing the outside of the battery cell; an injection hole 101 is provided on the first plate 11.

[0033] The second plate 12 is the lower plastic layer, and therefore it is laid on the surface of the first plate 11 facing the inside of the battery cell. A through hole 102 is opened on the second plate 12, which is aligned with the liquid injection hole 101. The end of the cover 2 facing the outside of the battery cell is fitted into the through hole 102. The cover plate 1 can achieve a sealed connection with the battery cell shell through the two-layer structure.

[0034] exist Figure 4 In a preferred embodiment shown, the inner diameter of the injection hole 101 is larger than the inner diameter of the through hole 102, so that the injection hole 101 has a larger inner diameter to accommodate the injection head; and the injection hole 101 and the through hole 102 form a funnel structure with the larger diameter at the top and the smaller diameter at the bottom, which helps to guide the electrolyte into the cell.

[0035] exist Figure 4 In a preferred embodiment shown, a flange 13 is provided at the end of the injection hole 101 facing the outside of the cell, and the flange 13 reduces the diameter of the injection hole 101; an annular concave space is formed between the flange 13 and the second plate 12, so that the sealing ring 5 is sandwiched between the flange 13 and the second plate 12, without coming out of the injection hole 101, and without hindering the inner ring of the sealing ring 5 from contacting the slide plate 3.

[0036] exist Figure 4In a preferred embodiment shown, the inner diameter of the narrowed hole of the injection hole 101 is not greater than the inner diameter of the through hole 102, so that the narrowed hole of the injection hole 101 can clamp the injection head to form a sealed liquid delivery structure.

[0037] exist Figure 4 In a preferred embodiment shown, the thickness of the second plate 12 is less than that of the first plate 11 to avoid the cover plate 1 being too thick, which would require the pole post to pass through the pole post hole on the cover plate 1 at a greater height.

[0038] exist Figure 4 In a preferred embodiment shown, the cross-sectional shape of the slide plate 3 along its moving direction is triangular or trapezoidal, preferably isosceles trapezoid, with the inclination angle of the hypotenuse being 30~60°. This design allows the slide plate 3 to have a certain thickness, preventing it from deforming and being damaged under the pressure of the outward squeezing force applied by the gas generated inside the battery cell. In addition, it increases the contact area between the inclined surface of the slide plate 3 and the sealing ring 5, improving the sealing strength. Furthermore, the inclined surface contact can disperse the vertical force applied by the gas generated by the battery cell into vertical and horizontal components, further avoiding the problem of deformation and damage to the slide plate 3 under stress.

[0039] exist Figure 4 In a preferred embodiment shown, the elastic member 4 is in a relaxed state, and the surface of the slide plate 3 facing the outside of the battery cell does not protrude from the surface of the cover plate 1 facing the outside of the battery cell, so that the slide plate 3 is always located inside the injection hole 101 and does not protrude outward.

[0040] exist Figure 4 In a preferred embodiment shown, the height of the grid holes on the outer peripheral wall of the housing 2 is not greater than the length of the elastic element 4 in the relaxed state, so that before the slide plate 3 is pressed down, the grid holes on the outer peripheral wall of the housing 2 are always inside the cell and no leakage will occur.

[0041] like Figure 1 As shown, combined with Figure 2 , Figure 3 and Figure 4 The present invention provides a battery cell that uses a battery cell top cover according to any of the above embodiments.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell top cover, characterized in that, include: A cover plate (1) has an injection hole (101) on it. The cover (2) is disposed on the end face of the cover plate (1) facing the inside of the cell and covers the end of the injection hole (101) facing the inside of the cell; The sliding plate (3) is set inside the cover (2) and moves inside the cover (2) in the direction perpendicular to the surface of the cover plate (1); The elastic element (4) is positioned between the end face of the sliding plate (3) facing the inside of the cell and the inner wall of the casing (2); A sealing ring (5) is fitted inside the injection hole (101); The outer peripheral wall of the cover (2) surrounding the moving direction of the slide plate (3) is provided with grid holes; When the elastic element (4) is in a relaxed state, the sealing ring (5) abuts against the edge of the end face of the sliding plate (3) facing the outside of the battery cell.

2. The battery cell top cover according to claim 1, characterized in that: The cover plate (1) includes, The first plate (11) is located on the side of the cover plate (1) facing the outside of the battery cell; The second plate (12) is laid on the plate surface of the first plate (11) facing the inside of the cell; The first plate (11) has an injection hole (101) and the second plate (12) has a through hole (102). The through hole (102) is aligned with the injection hole (101), and the end of the cover (2) facing the outside of the cell is fitted inside the through hole (102).

3. A battery cell top cover according to claim 2, characterized in that: The inner diameter of the injection hole (101) is larger than the inner diameter of the through hole (102).

4. A battery cell top cover according to claim 3, characterized in that: The injection hole (101) has a flange (13) at one end facing the outside of the cell, and the flange (13) reduces the diameter of the injection hole (101); the sealing ring (5) is sandwiched between the flange (13) and the second plate (12).

5. A battery cell top cover according to claim 4, characterized in that: The inner diameter of the narrowed hole (101) is not greater than the inner diameter of the through hole (102).

6. A battery cell top cover according to claim 2, characterized in that: The thickness of the second plate (12) is less than that of the first plate (11).

7. A battery cell top cover according to claim 1, characterized in that: The cross-sectional shape of the slide plate (3) along its direction of movement is triangular or trapezoidal.

8. A battery cell top cover according to claim 1, characterized in that: When the elastic element (4) is in a relaxed state, the surface of the slide plate (3) facing the outside of the cell does not protrude from the surface of the cover plate (1) facing the outside of the cell.

9. A battery cell top cover according to claim 1, characterized in that: The height of the grid holes on the outer peripheral wall of the cover (2) is not greater than the length of the elastic element (4) in the relaxed state.

10. A battery cell, characterized in that: The battery cell top cover is as described in any one of claims 1 to 9.

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