Battery cover plate liquid injection hole anti-sealing structure and battery

Abstract

The utility model discloses a battery cover plate liquid injection hole anti-sealing structure and a battery, and relates to the technical field of battery liquid injection. The device specifically comprises a cover plate with a liquid injection hole, and further comprises a convex piece and a flow guide groove, and the convex piece is arranged at the liquid injection hole of the cover plate; the flow guide groove is formed in the peripheral wall of the convex piece, extends towards the liquid injection hole and is communicated with the liquid injection hole; an adhesive tape can be attached to the side, away from the cover plate, of the protruding piece and at most covers part of the flow guide groove. The adhesive tape can be attached to one side of the protruding part, if the adhesive tape is attached to the protruding part in a deviated mode, the flow guide groove is formed in the protruding part, the liquid injection hole and the flow guide groove are combined, even if the adhesive tape is attached to the protruding part, the liquid injection hole cannot be completely sealed, and if electrolyte is injected, the electrolyte flows into the battery from the liquid injection hole and the flow guide groove, so that the electrolyte cannot be completely sealed. Therefore, electrolyte can be injected into the battery, and water vapor in the battery can be timely discharged from the electrolyte injection hole and the diversion trench when the battery is baked at a high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection, in particular to an anti-sealing structure for a liquid injection hole of a battery cover and a battery. Background Art

[0002] The battery cover is a crucial component of lithium-ion batteries, protecting the battery's internal components, withstanding external pressure, and ensuring the battery's tightness. During lithium-ion battery R&D, trial production, and production, the battery must be baked before electrolyte injection. This baking process evaporates the moisture inside the battery, while simultaneously pumping negative pressure out of the battery's casing through the injection port.

[0003] At present, the existing battery cover is as shown in the present application. Figure 1 As shown, a liquid injection hole is provided on the battery cover. When electrolyte needs to be injected into the battery, the electrolyte is injected into the battery through the liquid injection hole, and the battery is sealed after the electrolyte is injected.

[0004] Regarding the above solution, the inventor believes that the application still has some shortcomings. Before the battery cover is filled with liquid, the core needs to be welded to the cover, and then high-temperature tape is applied to the core tab and the cover welding area to restrain the welding slag remaining after welding and prevent the slag from damaging the core. However, when applying the high-temperature tape to the battery cover, since the injection hole is located adjacent to the core welding area, the high-temperature tape is easily offset when the equipment is applying the glue. If the glue is offset, the injection hole will be blocked by the tape. The injection hole is blocked, and the water vapor generated in the battery shell cannot be extracted during the baking process. The internal pressure of the battery is higher than the external pressure, causing the battery to swell. At the same time, it is not easy for the electrolyte to flow into the battery from the injection port blocked by the high-temperature tape. Even if the electrolyte flows in from the injection port, the water reacts with the electrolyte after injection, affecting the battery performance.

[0005] Therefore, the present application aims to prevent the injection hole of the battery cover from being blocked by the high-temperature adhesive tape, which would result in the obstruction of the battery injection and water vapor discharge, causing the electrolyte to react with moisture after subsequent injection, thus affecting the battery performance. Utility Model Content

[0006] The main purpose of the present utility model is to provide a method for preventing the injection hole of the battery cover from being blocked by the high-temperature adhesive tape, resulting in the obstruction of the battery injection and water vapor discharge, causing the electrolyte to react with moisture after subsequent injection, affecting the battery performance.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a battery cover liquid injection hole anti-sealing structure, comprising a cover with a liquid injection hole, and further comprising:

[0008] a convex part, provided at the liquid injection hole of the cover plate; and

[0009] a guide groove, formed on a peripheral wall of the protruding member, the guide groove extending toward the liquid injection hole and communicating with the liquid injection hole;

[0010] Wherein, a tape can be attached to the side of the protrusion away from the cover plate, and the tape at most covers a portion of the guide groove.

[0011] In the above scheme, the injection hole is used to add electrolyte into the cover plate. At the same time, it can also promote the internal evaporated water to be discharged from the injection hole during the battery drying process after the battery is assembled, so as to ensure the production quality of the battery; the protrusion is installed on one side of the injection hole. When the electrolyte is injected into the injection hole, the electrolyte flows from the cover plate to the protrusion, and gradually flows into the battery in the guide groove of the protrusion. When the tape is affixed to the cover plate, the tape may not adhere to the protrusion. At this time, the tape does not cover the guide groove. At this time, the guide groove can normally flow into the electrolyte or discharge water vapor.

[0012] Furthermore, the guide groove includes at least one connecting groove provided on the cover plate, wherein when the electrolyte is injected toward the injection hole, the electrolyte flows from the injection hole to the connecting groove, and then flows from the connecting groove to the interior of the battery, thereby realizing the injection operation.

[0013] Furthermore, a through hole is provided in the middle of the protrusion, which is connected to the connecting groove. The connecting groove is connected to both sides of the cover plate through the through hole. The injection hole and the through hole can be used to inject electrolyte into the battery. The connecting groove is opened from the cover plate to the through hole, thereby increasing the space for electrolyte to flow into the battery.

[0014] Furthermore, the guide groove includes at least one side groove opened on the protrusion, wherein the groove is a hole perpendicular to the direction of the cover plate, and its opening direction is preferably set on the side of the protrusion to increase the flow space of the protrusion through hole.

[0015] Furthermore, the side grooves extend in a direction perpendicular to the cover plate and penetrate the cover plate. The side grooves in a direction perpendicular to the cover plate can allow the electrolyte to flow in faster, and a plurality of side grooves can also be provided.

[0016] Furthermore, the side grooves extend along the axis of the protrusion and obliquely relative to the cover plate, and penetrate the cover plate. The side grooves can also be arranged obliquely, which can guide the electrolyte or water vapor. The area of ​​the side grooves away from the cover plate can gradually increase, reducing the planar area of ​​the protrusion and increasing the space for electrolyte or water vapor to flow out of the side grooves, further preventing blockage and sealing.

[0017] Furthermore, the protrusion is a cylinder, a boss or a frustum.

[0018] The present application also discloses that the battery is equipped with the aforementioned anti-sealing structure for the battery cover injection hole. After the battery and cover are packaged, if the tape is attached to the protruding piece, the tape cannot be removed and may damage the winding core tab. When electrolyte is injected into the injection hole, the electrolyte flows from the injection hole to the through-hole, connecting groove, and side groove defined by the protruding piece. The tape cannot completely seal the groove defined by the protruding piece, so at least some space remains to allow the electrolyte to flow into the interior of the battery.

[0019] The above technical solution has the following advantages:

[0020] The utility model adopts a convex piece on one side of which the tape can be attached. If the tape is offset and attached to the convex piece, a guide groove is provided on the convex piece, and the guide groove is connected to the injection hole, so that the tape and the injection hole are not completely sealed. If electrolyte is injected into the injection hole, the electrolyte flows into the interior of the battery from the guide groove, thereby preventing the tape from attaching to the injection hole and completely blocking the injection hole. At the same time, if the battery is heated at a high temperature, the water vapor contained in the battery will also be discharged from the guide groove and the injection hole, further improving the overall performance of the battery injection and maintaining the production quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0022] Figure 1 It is a structural diagram of the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of the utility model after gluing;

[0024] Figure 3 It is a structural diagram of the present utility model.

[0025] In the figure: 1, cover plate; 2, liquid injection hole; 21, protrusion; 22, connecting groove; 23, side groove; 3, tape. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0027] like Figure 1 and Figure 2As shown, in this application, tape 3 is attached to both ends of the cover plate 1. The tape 3 is made of high-temperature resistant material. Its purpose is to restrain the residual welding slag after welding and prevent the welding slag from damaging the core. However, after the tape 3 is attached, the tape 3 will stick to the core, and the core tab is made of aluminum foil with a thickness of about 12±1μm. If the injection hole 2 is only a plane and the tape 3 has sealed the injection hole 2, if it is found that the tape 3 needs to be torn, the core tab will be gradually torn and damaged through the tape 3, thereby causing the cover plate 1 to be scrapped. If a hole is opened in the tape 3 at the injection hole 2, there is a risk of scratching the cover plate; the tape covers the tab, and when the hole is opened in the tape, the tab will be torn, causing the battery cell to be scrapped.

[0028] like Figure 1-Figure 3 As shown, a battery cover liquid injection hole anti-sealing structure includes a cover 1 with a liquid injection hole 2, and also includes a protrusion 21 and a guide groove, the protrusion 21 is provided at the liquid injection hole 2 of the cover 1; the guide groove is provided on the peripheral wall of the protrusion 21, the guide groove extends toward the liquid injection hole 2, and is connected to the liquid injection hole 2; wherein, the side of the protrusion 21 away from the cover 1 can be attached with a tape 3, and the tape 3 at most covers a portion of the guide groove. The injection hole 2 is used to add electrolyte into the cover plate 1. It can also promote the internal evaporated water to be discharged from the injection hole 2 during the battery drying process after the battery is assembled, so as to ensure the production quality of the battery. The protrusion 21 is installed on one side of the injection hole 2. When the electrolyte is injected into the injection hole 2, the electrolyte flows from the cover plate 1 to the protrusion 21, and gradually flows into the battery in the guide groove of the protrusion 21. When the tape 3 is affixed to the cover plate 1, the tape 3 may not be attached to the protrusion 21. At this time, the tape 3 does not cover the guide groove. At this time, the guide groove can normally flow into the electrolyte or discharge water vapor. If the tape 3 is attached to the protrusion 21, the tape 3 will cover part of the guide groove. The uncovered guide groove allows the electrolyte to flow into the battery normally or water vapor to be discharged normally, instead of the original injection hole 2 being blocked by the tape 3, which affects the injection and discharge of water vapor.

[0029] like Figure 3 As shown, the guide groove includes at least one connecting groove 22 opened on the cover plate 1, and the connecting groove 22 is connected to the injection hole 2, wherein a plurality of connecting grooves 22 can be opened to ensure the communication space of the injection hole 2; when the electrolyte is injected toward the injection hole 2, the electrolyte flows from the injection hole 2 to the connecting groove 22, and then flows from the connecting groove 22 to the interior of the battery, thereby realizing the injection operation; at the same time, if the battery is dried, the water vapor in the battery evaporates, and the water vapor flows outward from the connecting groove 22 and the injection hole 2, thereby ensuring that the battery is dry and avoiding water vapor remaining in the battery, causing water to react with the electrolyte and affect the performance of the battery.

[0030] like Figure 3As shown, a through hole connected to the connecting groove 22 is provided in the middle of the protrusion 21, and the connecting groove 22 is connected to both sides of the cover plate 1 through the through hole, wherein the through hole is connected to the injection hole 2, and the electrolyte can be injected into the battery by means of the injection hole 2 and the through hole. The connecting groove 22 is opened from the cover plate 1 to the through hole, thereby increasing the space for the through hole to flow into the battery.

[0031] like Figure 3 As shown, the guide groove includes at least one side groove 23 opened on the protrusion 21, wherein the side groove 23 is a hole perpendicular to the direction of the cover plate 1, and its opening direction is preferably set on the side of the protrusion 21, which is used to increase the flow space of the through hole of the protrusion 21. This method can further increase the inflow space of the electrolyte. The side grooves 23 and the connecting grooves 22 can be alternately arranged with each other or can be freely selected to increase the space for the electrolyte to flow in or the water vapor to flow out.

[0032] In the present application, the side grooves 23 extend in a direction perpendicular to the cover plate 1 and penetrate the cover plate 1, allowing the electrolyte to flow into the side grooves 23 more quickly. A plurality of side grooves 23 may also be provided. Furthermore, the side grooves 23 extend along the axis of the protrusion 21 and obliquely relative to the cover plate 1. The side grooves 23 penetrate the cover plate 1 and may also be arranged at an angle. This arrangement can guide the electrolyte or water vapor. The area of ​​the side grooves 23 away from the cover plate 1 can gradually increase, reducing the planar area of ​​the protrusion 21 and increasing the space for the electrolyte or water vapor to flow out of the side grooves 23, further preventing blockage and sealing.

[0033] In the present application, the protrusion 21 is a cylinder, a boss or a frustum. If a cylinder is used, the through hole and the side groove 23 are both opened on the cylinder. The through hole is preferably set in the center part of the cylinder, and the side groove 23 is set on the outer wall of the cylinder; if a boss is used, the boss can be regular or irregular in shape, and the side groove 23 is preferably opened at the edge of the boss, and the through hole is opened in the center part of the boss; if a frustum is used, the frustum is similar to the cylinder, and the main difference is that the side groove 23 is inclined at the edge of the frustum.

[0034] like Figure 2 and Figure 3 As shown, a battery is installed with the above-mentioned battery cover liquid injection hole anti-sealing structure. After the battery and the cover 1 are packaged, if the tape 3 is attached to the protruding piece 21, the tape 3 cannot be torn off again at this time, which may easily tear the core electrode ear. If the electrolyte is injected toward the liquid injection hole 2, the electrolyte flows from the liquid injection hole 2 to the through hole, connecting groove 22 and side groove 23 opened by the protruding piece 21. The tape 3 cannot completely seal the groove body opened by the protruding piece 21, so there is at least some space for the electrolyte to flow into the interior of the battery; similarly, when the battery is dried, there is at least some space for the water vapor in the battery to be discharged, so as to ensure that the battery is dry and tidy, and maintain the overall performance after the subsequent battery filling.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery cover liquid injection hole anti-sealing structure, comprising a cover (1) with a liquid injection hole (2), characterized in that: Also includes: A convex part (21) is provided at the liquid injection hole (2) of the cover plate (1); and A guide groove is provided on the peripheral wall of the protruding member (21), the guide groove extending toward the liquid injection hole (2) and communicating with the liquid injection hole (2); Wherein, a tape (3) can be attached to the side of the protrusion (21) away from the cover plate (1), and the tape (3) at most covers a portion of the guide groove.

2. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 1, characterized in that: The guide groove comprises at least one connecting groove (22) opened on the cover plate (1).

3. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 2, characterized in that: A through hole connected to the connecting groove (22) is provided in the middle of the protruding piece (21), and the connecting groove (22) is connected to both sides of the cover plate (1) through the through hole.

4. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 1, characterized in that: The guide groove includes at least one side groove (23) opened on the protruding part (21).

5. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 4, characterized in that: The side groove (23) extends in a direction perpendicular to the cover plate (1) and passes through the cover plate (1).

6. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 4, characterized in that: The side groove (23) extends along the axial direction of the protruding piece (21) and is inclined to the direction of the cover plate (1), and the side groove (23) passes through the cover plate (1).

7. The anti-sealing structure for the liquid injection hole of the battery cover according to claim 1, characterized in that: The convex part (21) is a cylinder, a boss or a frustum.

8. A battery, characterized in that: The battery is mounted with a battery cover liquid injection hole anti-sealing structure as claimed in any one of claims 1 to 7.

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