Battery liquid injection nozzle and electrolyte injection device

Abstract

The utility model discloses a battery liquid injection nozzle and an electrolyte injection device. The battery liquid injection nozzle is used for injecting electrolyte into a liquid injection hole of a battery and comprises a liquid injection nozzle body, and a liquid injection channel is formed in the liquid injection nozzle body; the outer wall of the liquid injection nozzle body is provided with a convex part which is tightly matched with the matching part of the liquid injection hole, the outer wall of the liquid injection nozzle body is of a step-shaped structure, and the convex part is located on the side wall connecting two adjacent steps and surrounds the side wall to form a circle; the matching part of the liquid injection hole is located between the sealing nail lap joint step of the liquid injection hole and the positive pole penetration welding step, and the positive pole penetration welding step is located below the sealing nail lap joint step. According to the utility model, the convex part is tightly matched with the battery liquid injection hole, and can be limited and clamped in the battery liquid injection hole after being inserted into the battery liquid injection hole, so that electrolyte is prevented from being on a liquid injection hole welding step during liquid injection of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection equipment, in particular to a battery liquid injection nozzle and an electrolyte liquid injection device. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy, and is a cup, trough, or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate current. The battery generally includes a shell and a winding core located inside the shell. During the manufacturing process of the battery, it is necessary to inject electrolyte into the shell so that the electrolyte fills the inside of the winding core. For batteries with injection holes, the injection hole needs to be sealed after the electrolyte is injected. The existing injection port sealing nozzle is a simple single-layer seal, and the sealing position is located outside the injection port; the surface of the penetrating welding step on the inside of the injection port will be soaked with electrolyte during the injection process, and electrolyte is easily residual. After the residual electrolyte crystallizes, the residual electrolyte at the right angle inside the inner side is difficult to clean up. During the subsequent sealing welding process, the residual electrolyte at the right angle inside the injection port will cause a fire, resulting in the battery seal being scrapped, and the battery seal welding yield is low. Utility Model Content

[0003] The utility model aims to overcome the deficiencies and defects of the prior art and to provide a battery filling nozzle and an electrolyte filling device.

[0004] The first aspect of the utility model provides a battery filling nozzle for injecting electrolyte into the filling hole of the battery, comprising a filling nozzle body, an injection channel formed inside the filling nozzle body; the outer wall of the filling nozzle body has a convex portion that tightly matches the matching portion of the filling hole of the concave sinker structure, the outer wall of the filling nozzle body is a step-shaped structure, the convex portion is located on the side wall connecting two adjacent steps, and forms a circle around the side wall; the matching portion of the filling hole is located between the sealing pin lap step of the filling hole and the positive pole penetration weld step, and the positive pole penetration weld step is located below the sealing pin lap step.

[0005] The side wall is arranged vertically and vertically connected to the step, and the convex portion is tightly matched with the circumferential surface of the inner wall of the injection hole.

[0006] The side wall is arranged vertically and vertically connected to the step. The matching portion of the injection hole is provided with a groove matching with the convex portion. The convex portion can extend into the groove and closely match with the groove.

[0007] Among them, the side wall is arranged at an angle and connected to the step in a Z shape, forming a convex part of the pointed structure; the first step and the second step are connected to form a Z-shaped step surface, forming a V-shaped groove that cooperates with the convex part of the pointed structure, and the convex part of the pointed structure can extend into the V-shaped groove and fit tightly with the V-shaped groove.

[0008] Wherein, the inner diameter of the liquid outlet end of the liquid injection nozzle body is smaller than the inner diameter of the lowest end opening of the liquid injection hole.

[0009] Wherein, the battery filling nozzle is made of elastic material and is an elastically deformable structure.

[0010] Wherein, the elastic material is rubber.

[0011] Wherein, the battery is a cylindrical battery, and the injection hole is formed on the positive electrode column of the battery.

[0012] Among them, the first step is a sealing pin overlapping step; the second step is a positive electrode column welding step.

[0013] A second aspect of the present invention provides an electrolyte injection device, comprising the battery injection nozzle of the first aspect of the present invention.

[0014] The liquid filling nozzle of the utility model can achieve a tight fit with the battery liquid filling hole through the provided convex part, and after being inserted into the battery liquid filling hole, it can be restricted and stuck on the outside of the battery liquid filling hole through the convex part, so as to prevent the electrolyte from remaining on the welding step of the battery liquid filling hole when the battery is filled, thereby overcoming the problem that the inner groove of the battery liquid filling port is soaked with electrolyte during the liquid filling process and electrolyte is easily left. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the battery liquid filling nozzle of the first embodiment of the utility model.

[0016] Figure 2 This is a first isometric view of the battery filling nozzle of the first embodiment of the utility model.

[0017] Figure 3 This is a second isometric view of the battery filling nozzle of the first embodiment of the utility model.

[0018] Figure 4 This is a cross-sectional view of the battery liquid filling nozzle of the first embodiment of the utility model after being tightly matched with the battery liquid filling hole of the first embodiment of the battery.

[0019] Figure 5 This is a cross-sectional view of a battery liquid filling hole according to a second embodiment of the present utility model.

[0020] Figure 6This is an axonometric view of a battery liquid filling hole according to a second embodiment of the present utility model.

[0021] Figure 7 This is an axonometric view of the battery liquid filling nozzle of the first embodiment of the utility model after being tightly matched with the battery liquid filling hole of the second embodiment.

[0022] Figure 8 This is a cross-sectional view of the battery liquid filling nozzle of the first embodiment of the utility model after being tightly matched with the battery liquid filling hole of the second embodiment.

[0023] Fig. 9 It is a cross-sectional view of a battery liquid filling hole according to the third embodiment of the present utility model.

[0024] Fig.10 This is an axonometric view of a battery liquid filling hole according to a third embodiment of the present utility model.

[0025] Fig.11 This is a cross-sectional view of the battery liquid filling nozzle of the first embodiment of the utility model after being tightly matched with the battery liquid filling hole of the third embodiment.

[0026] Fig.12 This is an axonometric view of the battery liquid filling nozzle of the first embodiment of the utility model after being tightly matched with the battery liquid filling hole of the third embodiment.

[0027] Fig.13 It is a cross-sectional view of the positive electrode side of a cylindrical battery using the injection hole of the first embodiment of the utility model. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] like Figures 1 to 4 As shown, the battery filling nozzle of the first embodiment of the utility model is used to inject electrolyte into the filling hole 7 of the battery, and includes a filling nozzle body, in which an filling channel 1 is formed; the outer wall of the filling nozzle body has a convex portion 5 that tightly matches the matching portion of the filling hole 7 of the concave sink structure, and the outer wall of the filling nozzle body is a step-like structure, with adjacent first filling nozzle steps 2 and second filling nozzle steps 3, and the convex portion 5 is located on the side wall 4 connecting the two adjacent steps and forms a circle around the side wall 4; the matching portion of the filling hole is located between the first step 8 and the second step 9 of the filling hole, and the second step 9 is located below the first step 8.

[0030] In the above embodiment, one end of the injection nozzle body is an electrolyte inlet channel for connecting to the injection machine cup, and the other end is an injection outlet for injecting electrolyte into the interior of the battery through the injection hole 7 of the battery. When in use, the injection nozzle is inserted into the injection hole of the battery.

[0031] In some embodiments, the side wall is arranged vertically and connected to the step vertically. The protrusion can directly and tightly match with the matching portion of the injection hole of the first embodiment of the inner wall of the injection hole. The matching portion of the injection hole of the first embodiment is a cylindrical inner wall 10, and its upper and lower inner diameters are the same. The protrusion is directly squeezed with the matching portion of the injection hole of the inner wall of the injection hole to form a tight fit to prevent the electrolyte from leaking onto the second step. In this embodiment, of the two adjacent steps, when injecting liquid, one is placed on the second step 9 of the injection hole, and the other is placed on the first step 8 of the injection hole. The protrusion 5 located between the two adjacent steps is in contact with the inner wall 10 of the battery injection hole of the first embodiment (see Figure 4 The second step of the liquid injection hole does not need to be cleaned by laser, wiped with non-woven fabric dry or wet, and the problem that the residual electrolyte at the liquid injection hole may cause fire and lead to the battery seal being scrapped is solved.

[0032] Among them, the injection nozzle is preferably an elastic deformable structure, and its material is an elastic material, preferably a rubber material, such as natural rubber, chloroprene rubber, EPDM rubber, nitrile rubber, fluororubber, butyl rubber, etc., which can withstand high temperature, acid and alkali, oil, and wear.

[0033] See also Figure 5 , 6 As shown, in some embodiments, in order to better cooperate with the convex part of the injection nozzle, a corresponding groove 11 may be formed on the inner wall 10 of the injection hole of the battery. This is the injection hole of the second embodiment of the utility model. The groove 11 is arranged on the inner wall surface between the first step 8 and the second step 9 of the injection hole. At this time, the convex part 5 can extend into the groove formed on the inner wall surface of the injection hole and tightly cooperate with the groove 11 (see Figure 7 , Figure 8As shown in the figure, the convex part and the groove of the injection hole can also be directly squeezed to form a tight fit to prevent the electrolyte from leaking onto the second step. The convex part of the injection nozzle has the same shape as the groove and is slightly smaller than the groove of the positive electrode. The groove can cover and accommodate the convex part of the injection nozzle. During injection, the groove can accommodate the corresponding matching convex part, the injection nozzle body is inserted into the battery injection hole, and the convex part of the injection nozzle is restricted and stuck in the groove. After the injection is completed, the injection nozzle and its components are evacuated, and the sealing pin is placed on the first step for welding. Due to the obstruction of the convex part of the injection nozzle, the electrolyte will not stick to the welding step, thereby improving the welding quality of the sealing pin.

[0034] Exemplarily, the height of the protrusion 5 of the injection nozzle is 0.15mm-0.45mm, the width is 0.15mm-0.35mm, and the cross-sectional shape of the protrusion of the injection nozzle can be semicircular, polygonal, trapezoidal, etc. More preferably, the height of the protrusion is 0.2mm, and the width is 0.2mm, which can be set as needed, but is not limited thereto.

[0035] Exemplarily, the groove 11 has a depth of 0.2mm-0.5mm and a width of 0.2mm-0.4mm. Preferably, the groove has a depth of 0.3mm and a width of 0.3mm. The cross-sectional shape of the groove is any available geometric shape such as semicircular, polygonal, trapezoidal, triangular, etc., and can be set as needed without limitation.

[0036] See also Fig.11 As shown, in some embodiments, the side wall 4 of the injection nozzle is arranged obliquely and vertically connected with the step in a Z-shape, forming a convex portion 13 of the sharp angle structure; the first step 8 and the second step 9 of the injection hole are connected to form a Z-shaped stepped surface, forming a V-shaped groove 12 that matches the convex portion of the sharp angle structure (see Fig. 9 , 10 , 11, and 12), the convex portion 13 of the pointed structure can extend into the V-shaped groove 12 and fit tightly with the V-shaped groove. Similarly, the convex portion of the pointed structure and the groove of the injection hole can be directly squeezed to form a tight fit to prevent the electrolyte from leaking onto the second step.

[0037] In order to facilitate liquid injection, the liquid injection nozzle is inserted into the battery liquid injection hole. The outer diameter of the liquid outlet end 6 of the liquid injection nozzle body is smaller than the inner diameter of the lowest end opening of the liquid injection hole. Optionally, the outer diameter of the liquid outlet of the liquid injection nozzle body is 0.6mm-2.6mm.

[0038] Among them, among the adjacent first injection nozzle step 2 and second injection nozzle step 3 on the outer surface of the battery injection nozzle, the upper first injection nozzle step 2 is used to rest on the second step 8, and optionally, the outer diameter is 1.8mm-5.8mm; the lower second injection nozzle step 3 is used to rest on the second step 9, and optionally, the outer diameter is 1.3mm-4.8mm.

[0039] See also Figure 4 , 5 , 6, 7, 8, 9, 10, 11, 12 and 13, preferably, the battery is a cylindrical battery, the injection hole 7 is formed on the positive electrode column 100 of the battery, located at the center of the positive electrode column 100, and is a channel for the electrolyte to enter the interior of the battery, and its diameter is 1.0-3.0mm. Among them, the first step 8 is a sealing nail overlapping step, which is used for overlapping and accommodating the sealing nail of the injection hole, so that the positive electrode column injection hole is sealed by the sealing nail, and the height from the second step below is 0.4-1.2mm, and the inner diameter is 2.0mm-6.0mm; the second step 9 is a positive electrode column penetration welding step, which is used to weld and connect the positive electrode column 100 of the battery and the positive current collecting plate 15, preferably, its thickness is 0.4-1.2mm, and the inner diameter is 1.5mm-5.0mm. The inner side of the positive current collecting plate 15 is the battery cell 16, which is wrapped by the battery casing 14, see Fig.13 shown.

[0040] In a more preferred embodiment, the outer diameter of the injection port of the injection nozzle is 0.8mm-1.0mm, the inner diameter of the injection port of the injection nozzle is 0.5mm-0.8mm, and the diameter of the injection hole of the positive electrode column through hole is 1.0mm-1.2mm; the second step height is 0.5mm-0.6mm, the inner diameter is 1.5mm-1.8mm, the first step height is 0.5mm-0.6mm, and the inner diameter is 2.0mm-2.2mm. Of course, it can be set as needed, not limited to this.

[0041] Among them, in a preferred embodiment, the outer diameter of the second injection nozzle step 3 where the injection nozzle contacts the second step 9 is smaller than the inner diameter of the second step, and the outer diameter of the protrusion is larger than the inner diameter of the second step; the outer diameter of the first injection nozzle step 2 where the injection nozzle contacts the first step 8 is smaller than the inner diameter of the first step.

[0042] From the above, it can be seen that the embodiment of the utility model utilizes the convex portion of the filling nozzle to prevent the electrolyte remaining in the filling outlet from dripping, prevents the electrolyte from remaining on the welding step of the battery filling hole when the battery is filled, and thus prevents welding defects from occurring during the subsequent welding of the electrolyte filling hole on the battery.

[0043] A second aspect of the embodiment of the utility model provides an electrolyte injection device, comprising the battery injection nozzle of the first aspect of the embodiment of the utility model.

[0044] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A battery injection nozzle, used to inject electrolyte into the injection hole of the battery, characterized in that: It includes an injection nozzle body, in which an injection channel is formed; the outer wall of the injection nozzle body has a convex portion that tightly matches the matching portion of the injection hole of the concave sinker structure, the outer wall of the injection nozzle body is a step-shaped structure, the convex portion is located on the side wall connecting two adjacent steps and forms a circle around the side wall; the matching portion of the injection hole is located between the first step and the second step of the injection hole, and the second step is located below the first step.

2. The battery filling nozzle according to claim 1, characterized in that: The side wall is arranged vertically and vertically connected to the step, and the convex part is tightly matched with the matching part of the liquid injection hole.

3. The battery liquid filling nozzle according to claim 1, characterized in that: The side wall is arranged vertically and vertically connected to the step. The matching portion of the injection hole is provided with a groove matching with the convex portion. The convex portion can extend into the groove and closely match with the groove.

4. The battery liquid filling nozzle according to claim 1, characterized in that: The side wall is arranged at an angle and connected to the step in a Z shape, forming a convex portion of a pointed structure; the first step and the second step are connected to form a Z-shaped step surface, forming a V-shaped groove that cooperates with the convex portion of the pointed structure, and the convex portion of the pointed structure can extend into the V-shaped groove and fit tightly with the V-shaped groove.

5. The battery liquid filling nozzle according to claim 1, characterized in that: The inner diameter of the liquid outlet end of the liquid injection nozzle body is smaller than the inner diameter of the lowest end opening of the liquid injection hole.

6. The battery filling nozzle according to claim 1, characterized in that: The battery liquid filling nozzle is made of elastic material and is an elastically deformable structure.

7. The battery liquid filling nozzle according to claim 6, characterized in that: The elastic material is rubber.

8. The battery liquid filling nozzle according to claim 1, characterized in that: The battery is a cylindrical battery, and the injection hole is formed on the positive electrode column of the battery.

9. The battery liquid filling nozzle according to claim 8, characterized in that: The first step is a sealing pin overlapping step; the second step is a positive electrode column welding step.

10. An electrolyte injection device, characterized in that: The invention comprises the battery liquid filling nozzle as described in any one of claims 1 to 9.

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