Liquid injection port assembly and battery cell cover plate assembly

Abstract

The utility model provides a liquid injection port assembly and a battery cell cover plate assembly, and relates to the technical field of lithium battery production, the liquid injection port assembly comprises a liquid injection connecting piece and a fixed pressing plate, the liquid injection connecting piece is used for being assembled in a liquid injection hole of a battery cell cover plate main body; a first through hole is formed in the liquid injection connecting piece, a fixed pressing plate is arranged at the lower end of the liquid injection connecting piece, a cap is assembled at the upper end of the liquid injection connecting piece, and the fixed pressing plate is assembled at the lower end of the liquid injection connecting piece. According to the liquid injection port assembly provided by the utility model, the liquid injection connecting piece is inserted into the liquid injection hole from the lower end of the battery cell cover plate main body and extends out of the upper end of the liquid injection hole; when liquid injection is needed, the liquid injection nozzle can be inserted into the first through hole of the liquid injection connecting piece, so that a traditional extrusion type connection mode is converted into a corresponding connection mode; in the liquid injection process, the combination mode of the liquid injection nozzle and the liquid injection connecting piece is converted into a wrapping mode from a pure extrusion mode, and the air tightness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a liquid injection port assembly and a battery core cover plate assembly. Background Art

[0002] At present, the designs of the battery cover and the injection equipment are separate. When designing the battery cover structure, only the assembly of the battery and the impact on the battery cell during the electrolyte injection process are considered. The surface of the battery cover is a smooth plane. The connection between the cover and the injection equipment is achieved only by pressing the rubber nozzle of the injection equipment on the battery cover. The coordination between the battery cover and the injection equipment during the injection process is not taken into consideration.

[0003] The current design of the battery cover for the injection port only focuses on the impact of the injection process on the inside of the battery, such as the impact of the injection process on the winding core, the infiltration of the electrolyte, etc. There is a lack of attention to the connection between the injection equipment and the battery. During injection, the equipment directly fits the circular rubber injection nozzle to the surface of the cover through pressure, and the airtightness cannot be guaranteed at this time. At the same time, in order to ensure the alignment of the injection nozzle and the injection hole, the inner diameter of the rubber injection nozzle will be larger than the injection hole, which causes the powder after the battery powder falls off during the repeated steps of injection and negative pressure extraction to gather at the injection nozzle, and eventually block the injection nozzle. Utility Model Content

[0004] The utility model aims to provide a liquid injection port assembly and a battery cover plate assembly to solve the technical problem that the air tightness cannot be guaranteed when the circular rubber liquid injection nozzle is directly fitted with the cover plate surface by pressure.

[0005] The utility model provides a liquid injection port assembly, comprising a liquid injection connector and a fixed pressure plate, wherein the liquid injection connector is used to be assembled in the liquid injection hole of the battery cover body, and the upper and lower ends of the liquid injection connector both extend out of the liquid injection hole;

[0006] A first through hole is provided on the injection connector, a fixed pressure plate is provided at the lower end of the injection connector, a cap is mounted on the upper end of the injection connector, the fixed pressure plate is mounted on the lower end of the injection connector, and a second through hole is provided on the fixed pressure plate which is concentric with the first through hole.

[0007] In an optional embodiment, the liquid injection connector includes a connector body, and a lower clamping protrusion is provided at the lower end of the connector body;

[0008] The fixed pressing plate has a lower assembly groove, and the lower clamping protrusion is assembled in the lower assembly groove.

[0009] In an optional embodiment, an upper clamping protrusion is provided at the upper end of the connector body;

[0010] The cap comprises a cap body, a first assembly hole is arranged in the cap body, a second assembly hole is arranged in the first assembly hole, and the inner diameter of the first assembly hole matches the outer diameter of the connector body;

[0011] The inner diameter of the second assembly hole matches the outer diameter of the upper clamping protrusion.

[0012] In an optional embodiment, at least two assembly grooves are evenly arranged on the upper clamping protrusion.

[0013] In an optional embodiment, an operating portion is provided at the upper end of the cap body.

[0014] In an optional embodiment, an upper reinforcement ring is provided on the upper end surface of the lower clamping protrusion; a reinforcement rib is provided in the upper reinforcement ring, and one end of the reinforcement rib is connected to one end of the connector body, and the other end is connected to the upper reinforcement ring.

[0015] In an optional embodiment, a supporting annular plate is provided at the upper end of the fixed pressing plate, and the supporting annular plate is used for abutting against the battery cell cover plate body.

[0016] In an optional embodiment, the liquid injection connector is made of rubber.

[0017] The liquid injection connector of the liquid injection port assembly provided by the utility model is inserted into the liquid injection hole from the lower end of the battery cover body and extends out from the upper end of the liquid injection hole; when liquid injection is required, the liquid injection nozzle can be inserted into the first through hole of the liquid injection connector, thereby converting the traditional extrusion type connection into a connection method with a corresponding connection; during the liquid injection process, the combination method of the liquid injection nozzle and the liquid injection connector is converted from a pure extrusion type to a wrapping type, thereby improving air tightness.

[0018] The utility model provides a battery cover assembly, comprising a battery cover body and a liquid injection port assembly as described in any one of the above-mentioned implementation modes.

[0019] In an optional embodiment, a first assembly groove for assembling an upper reinforcement ring and a second assembly groove for assembling a reinforcement rib are provided on the lower end surface of the battery cover body;

[0020] And the first assembly groove and the second assembly groove are communicated.

[0021] Compared with the prior art, the battery cover assembly provided by the utility model has the liquid injection port assembly provided by the utility model, and thus has all the beneficial effects of the liquid injection port assembly provided by the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the liquid injection port assembly provided in an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A schematic structural diagram of a cap of a liquid injection port assembly shown;

[0025] Figure 3 for Figure 1 A schematic structural diagram of a liquid injection connector of a liquid injection port assembly shown;

[0026] Figure 4 for Figure 1 A schematic structural diagram of the liquid injection connector of the liquid injection port assembly shown in FIG.

[0027] Figure 5 for Figure 1 A schematic structural diagram of a fixed pressure plate of a liquid injection port assembly shown;

[0028] Figure 6 for Figure 1 A schematic structural diagram of the connection between the liquid injection connector and the fixed pressure plate of the liquid injection port assembly shown;

[0029] Figure 7 A schematic diagram of the structure of a battery cover assembly provided in an embodiment of the utility model;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the battery cover plate assembly without the cap installed shown;

[0031] Fig. 9 for Figure 7 A schematic structural diagram of a cell cover plate main body of a cell cover plate assembly is shown.

[0032] Icons: 100-cap; 101-cap body; 102-first assembly hole; 103-second assembly hole; 104-operating part; 200-liquid injection connector; 201-connector body; 202-upper clamping protrusion; 203-assembly groove; 204-first through hole; 205-lower clamping protrusion; 206-upper reinforcement ring; 207-reinforcement rib; 300-fixed pressure plate; 301-second through hole; 302-lower assembly groove; 303-supporting annular plate; 400-battery cover body; 401-liquid injection hole; 402-first assembly groove; 403-second assembly groove. DETAILED DESCRIPTION

[0033] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0037] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0038] Example

[0039] Reference Figure 1-Figure 9 The utility model provides a liquid injection port assembly, including a liquid injection connector 200 and a fixed pressure plate 300, wherein the liquid injection connector 200 is used to be assembled in a liquid injection hole 401 of a battery cover body 400, and both upper and lower ends of the liquid injection connector 200 extend out of the liquid injection hole 401;

[0040] A first through hole 204 is provided on the injection connector 200, a fixed pressure plate 300 is provided at the lower end of the injection connector 200, a cap 100 is assembled at the upper end of the injection connector 200, the fixed pressure plate 300 is assembled at the lower end of the injection connector 200, and a second through hole 301 is provided on the fixed pressure plate 300 which is concentric with the first through hole 204.

[0041] In some embodiments, the liquid injection port assembly includes a liquid injection connector 200, a fixed pressure plate 300 and a cap 100; wherein the liquid injection connector 200 can be inserted into the liquid injection hole 401 from the lower end of the battery cell cover body 400, and the upper end of the liquid injection connector 200 can extend from the liquid injection hole 401.

[0042] The fixed pressure plate 300 can be assembled on the lower end of the injection connector 200 and can be connected to the battery cover body 400, which can effectively prevent the injection connector 200 from detaching from the injection hole 401, so that the injection connector 200 can be firmly fixed on the injection hole 401; when injection is required, the injection nozzle can be inserted into the through hole of the injection connector 200, thereby converting the traditional extrusion connection into a corresponding connection; during the injection process, the combination method of the injection nozzle and the injection connector 200 is converted from pure extrusion type to wrapping type, thereby improving air tightness.

[0043] The fixed pressing plate 300 is provided with a second through hole 301 , which is arranged corresponding to the first through hole 204 , so as to avoid the installation of the fixed pressing plate 300 affecting the injection of the electrolyte.

[0044] Reference Figure 3 and Figure 4 In an optional embodiment, the injection connector 200 includes a connector body 201, and a lower clamping protrusion 205 is provided at the lower end of the connector body 201;

[0045] The fixed pressing plate 300 has a lower assembly groove 302 , and the lower clamping protrusion 205 is assembled in the lower assembly groove 302 .

[0046] In some embodiments, the lower end of the connector body 201 of the injection connector 200 has a lower snap-fit ​​protrusion 205 , the outer diameter of which is larger than the inner diameter of the injection hole 401 ; the lower snap-fit ​​protrusion 205 cannot enter the injection hole 401 .

[0047] A lower assembly groove 302 is provided on the fixed pressure plate 300, and the lower clamping protrusion 205 can be assembled in the lower assembly groove 302, and the second through hole 301 on the fixed pressure plate 300 is correspondingly arranged with the first through hole 204; the fixed pressure plate 300 is connected to the battery cell cover plate body 400, so that the liquid injection connector 200 can be fixed on the battery cell cover plate body 400, so that the liquid injection connector 200 cannot be separated from the liquid injection hole 401.

[0048] Generally, the material of the fixed pressing plate 300 is plastic, and the fixed pressing plate 300 and the battery cover plate body 400 can be fixed by gluing or plastic welding.

[0049] In an optional embodiment, an upper clamping protrusion 202 is provided at the upper end of the connector body 201;

[0050] The cap 100 includes a cap body 101, a first assembly hole 102 is provided in the cap body 101, a second assembly hole 103 is provided in the first assembly hole 102, and the inner diameter of the first assembly hole 102 matches the outer diameter of the connector body 201;

[0051] The inner diameter of the second assembly hole 103 matches the outer diameter of the upper clamping protrusion 202 .

[0052] After the cell cover body 400 is assembled into a cell, in order to prevent foreign matter from entering the cell through the first through hole 204, the cap 100 is fixed to the upper end of the injection connector 200, so that foreign matter can be prevented from entering the cell through the first through hole 204, and the cap 100 can be reused.

[0053] After the cap 100 is fixed on the liquid injection connector 200 , the battery cell can effectively prevent moisture from entering during the subsequent manufacturing process, thereby effectively controlling the moisture in the battery cell.

[0054] In order to better connect the cap 100 with the injection connector 200, the cap body 101 has a first assembly hole 102 and a second assembly hole 103, wherein the upper snap-fitting protrusion 202 of the injection connector 200 is assembled into the first assembly hole 102 and enters into the second assembly hole 103 by an interference fit assembly method, and the inner diameter of the second assembly hole 103 is larger than the inner diameter of the first assembly hole 102. After the upper snap-fitting protrusion 202 is assembled into the second assembly hole 103, the upper snap-fitting protrusion 202 is not easy to pass through the first assembly hole 102, that is, the cap body 101 is not easy to detach from the injection connector 200.

[0055] In an optional embodiment, at least two assembly grooves 203 are evenly arranged on the upper clamping protrusion 202 .

[0056] Reference Figure 2In an optional embodiment, an operating portion 104 is provided at the upper end of the cap body 101 .

[0057] In some embodiments, at least two assembly grooves 203 are generally provided on the upper clamping protrusion 202, and three assembly grooves 203 or four assembly grooves 203 may also be provided; a protrusion matching the assembly groove 203 is provided on the injection nozzle, which can facilitate assembly.

[0058] An operating portion 104 is provided on the cap body 101, and the cap 100 can be operated by the operating portion 104, that is, the cap 100 can be fixed on the liquid injection connector 200 by mechanical operation; in the prior art, a sealing rubber nail is generally inserted into the liquid injection hole 401; the connection method between the cap 100 and the liquid injection connector 200 is a buckle type, which is different from the traditional rubber nail assembly invasive type; the risk of the traditional rubber nail breaking and remaining in the battery cell is completely avoided.

[0059] Reference Figure 3 In an optional embodiment, an upper reinforcement ring 206 is provided on the upper end surface of the lower clamping protrusion 205; a reinforcement rib 207 is provided in the upper reinforcement ring 206, and one end of the reinforcement rib 207 is connected to one end of the connector body 201, and the other end is connected to the upper reinforcement ring 206.

[0060] Reference Figure 5 In an optional embodiment, a supporting annular plate 303 is provided at the upper end of the fixed pressing plate 300 , and the supporting annular plate 303 is used for abutting against the battery cell cover plate body 400 .

[0061] In an optional embodiment, the liquid injection connector 200 is made of rubber.

[0062] The liquid injection connector 200 of the liquid injection port assembly provided by the utility model is inserted into the liquid injection hole 401 from the lower end of the battery cover body 400 and extends from the upper end of the liquid injection hole 401; when liquid injection is required, the liquid injection nozzle can be inserted into the first through hole 204 of the liquid injection connector 200, thereby converting the traditional extrusion connection into a corresponding connection; during the liquid injection process, the combination mode of the liquid injection nozzle and the liquid injection connector 200 is converted from a pure extrusion type to a wrapping type, thereby improving air tightness.

[0063] Reference Figure 7 , Figure 8 and Fig. 9 The utility model provides a battery cover assembly, including a battery cover body 400 and a liquid injection port assembly as described in any one of the aforementioned embodiments.

[0064] In an optional embodiment, a first assembly groove 402 for assembling the upper reinforcement ring 206 and a second assembly groove 403 for assembling the reinforcement rib 207 are provided on the lower end surface of the cell cover body 400; and the first assembly groove 203 and the second assembly groove 403 are connected.

[0065] In some embodiments, the lower end surface of the cell cover body 400 is provided with a first assembly groove 203 and a second assembly groove 403; when the liquid injection connector 200 is assembled into the liquid injection hole 401 from the lower end of the cell cover body 400, the upper reinforcing ring 206 is assembled into the first assembly groove 203, and the reinforcing rib 207 is assembled into the second assembly groove 403, so that the liquid injection connector 200 is assembled into the liquid injection hole 401; the reinforcing rib 207 prevents the liquid injection connector 200 from rotating, even if the liquid injection connector 200 and the liquid injection hole 401 do not rotate relative to each other. This can effectively ensure that the liquid injection connector 200 will not rotate after assembly, thereby causing wear and leakage.

[0066] Compared with the prior art, the battery cover assembly provided by the utility model has the liquid injection port assembly provided by the utility model, and thus has all the beneficial effects of the liquid injection port assembly provided by the utility model.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A liquid injection port assembly, characterized in that: It comprises a liquid injection connector (200) and a fixed pressing plate (300), wherein the liquid injection connector (200) is used to be assembled in a liquid injection hole (401) of a battery cell cover plate body (400), and both upper and lower ends of the liquid injection connector (200) extend out of the liquid injection hole (401); The liquid injection connector (200) is provided with a first through hole (204), a fixed pressing plate (300) is provided at the lower end of the liquid injection connector (200), a cap (100) is mounted at the upper end of the liquid injection connector (200), the fixed pressing plate (300) is mounted at the lower end of the liquid injection connector (200), and a second through hole (301) is provided on the fixed pressing plate (300) and is arranged concentrically with the first through hole (204).

2. The liquid injection port assembly according to claim 1, characterized in that: The liquid injection connector (200) comprises a connector body (201), and a lower clamping protrusion (205) is provided at the lower end of the connector body (201); The fixed pressing plate (300) has a lower assembly groove (302), and the lower clamping protrusion (205) is assembled in the lower assembly groove (302).

3. The liquid injection port assembly according to claim 2, characterized in that: An upper clamping protrusion (202) is provided at the upper end of the connecting piece body (201); The cap (100) comprises a cap body (101), a first assembly hole (102) is provided in the cap body (101), a second assembly hole (103) is provided in the first assembly hole (102), and the inner diameter of the first assembly hole (102) matches the outer diameter of the connector body (201); The inner diameter of the second assembly hole (103) matches the outer diameter of the upper clamping protrusion (202).

4. The liquid injection port assembly according to claim 3, characterized in that: At least two assembly grooves (203) are evenly arranged on the upper clamping protrusion (202).

5. The liquid injection port assembly according to claim 3, characterized in that: An operating portion (104) is provided at the upper end of the cap body (101).

6. The liquid injection port assembly according to claim 2, characterized in that: An upper reinforcing ring (206) is arranged on the upper end surface of the lower clamping protrusion (205); a reinforcing rib (207) is arranged inside the upper reinforcing ring (206), and one end of the reinforcing rib (207) is connected to one end of the connector body (201), and the other end is connected to the upper reinforcing ring (206).

7. The liquid injection port assembly according to claim 1, characterized in that: A supporting annular plate (303) is provided at the upper end of the fixed pressing plate (300), and the supporting annular plate (303) is used for abutting against the battery cell cover plate body (400).

8. The liquid injection port assembly according to claim 1, characterized in that: The material of the liquid injection connecting piece (200) is rubber.

9. A battery cell cover assembly, characterized in that: It comprises a battery cell cover plate body (400) and a liquid injection port assembly as described in any one of claims 1 to 7.

10. The battery cell cover plate assembly according to claim 9, characterized in that: A first assembly groove (402) for assembling an upper reinforcement ring (206) and a second assembly groove (403) for assembling a reinforcement rib (207) are provided on the lower end surface of the battery cover body (400); and the first assembly groove (402) and the second assembly groove (403) are communicated.

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