Battery cell cover plate assembly and battery cell

Abstract

The utility model provides a battery cell cover plate assembly and a battery cell, and relates to the technical field of lithium battery production, the battery cell cover plate assembly comprises a battery cell cover plate main body, and the battery cell cover plate main body is provided with a liquid injection hole; a fixed pressing plate is assembled on the liquid injection connecting piece, and the fixed pressing plate is arranged on the lower end surface of the battery cell cover plate main body; and a connecting hole which is concentric with the through hole is formed in the fixed pressing plate. According to the battery cell cover plate assembly provided by the utility model, the liquid injection hole is formed in the battery cell cover plate main body, the liquid injection connecting piece is assembled in the liquid injection hole, and the upper end and the lower end of the liquid injection connecting piece extend out of the liquid injection hole; when liquid injection is needed, the liquid injection nozzle can be inserted into the 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 battery cover plate assembly and a battery cell. 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 battery cover plate assembly and a battery cell, so as to solve the technical problem that the air tightness cannot be guaranteed when a circular rubber liquid injection nozzle is directly fitted with the cover plate surface by pressure.

[0005] The utility model provides a battery cover assembly, comprising a battery cover body, a liquid injection hole is arranged on the battery cover body, and a liquid injection connector is mounted on the liquid injection hole; a through hole is arranged on the liquid injection connector, and the through hole communicates with the upper and lower ends of the battery cover body;

[0006] A fixed pressing plate is mounted on the liquid injection connector, and the fixed pressing plate is arranged on the lower end surface of the battery cover body; a connecting hole is arranged concentrically with the through hole on the fixed pressing plate.

[0007] In an optional embodiment, the liquid injection connector is made of rubber.

[0008] In an optional embodiment, the liquid injection connector includes a connector body, a lower clamping protrusion is provided at the lower end of the connector body, and the outer diameter of the lower clamping protrusion is greater than the inner diameter of the liquid injection hole;

[0009] An upper clamping protrusion is arranged at the upper end of the connecting member body, and the outer diameter of the upper clamping protrusion is larger than the inner diameter of the liquid injection hole.

[0010] In an optional embodiment, an upper reinforcing ring is provided on the upper end surface of the lower clamping protrusion; and a first fixing groove matching the upper reinforcing ring is provided on the battery cell cover body.

[0011] In an optional embodiment, a reinforcing rib is provided in the upper reinforcing ring, and the reinforcing rib is provided on the upper end surface of the lower clamping protrusion, one end of the reinforcing rib is connected to the connecting member body, and the other end is connected to the upper reinforcing ring;

[0012] The battery cover body is provided with a second fixing groove matching the reinforcing rib, and the second fixing groove is communicated with the first fixing groove.

[0013] In an optional embodiment, two curved grooves are provided on the upper clamping protrusion, and the two curved grooves are symmetrically arranged on the upper clamping protrusion.

[0014] In an optional embodiment, four bending grooves are provided on the upper clamping protrusion, and the four bending grooves are evenly arranged on the upper clamping protrusion.

[0015] In an optional embodiment, the fixed pressure plate has a lower assembly groove, and the lower end of the injection connector matches the lower assembly groove, and the through hole provided on the fixed pressure plate is connected to the lower assembly groove.

[0016] 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 to abut against the battery cell cover plate body.

[0017] The battery cover plate body of the battery cover plate assembly provided by the utility model is provided with a liquid injection hole, the liquid injection connector is assembled in the liquid injection hole, and the upper and lower ends of the liquid injection connector both extend from the liquid injection hole; when liquid injection is required, the liquid injection nozzle can be inserted into the through hole of the liquid injection connector, thus converting the traditional extrusion connection into a corresponding connection connection mode; during the liquid injection process, the combination mode 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 fixed pressing plate is arranged on the battery cover body and connected to the liquid injection connector, which can effectively prevent the liquid injection connector from detaching from the liquid injection hole, so that the liquid injection connector can be firmly fixed on the liquid injection hole.

[0019] The utility model provides a battery cell, comprising the battery cell cover plate assembly described in any one of the aforementioned implementation modes.

[0020] Compared with the prior art, the battery cell provided by the utility model has the battery cell cover plate assembly provided by the utility model, and thus has all the beneficial effects of the battery cell cover plate assembly provided by the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A schematic diagram of the structure of a battery cover assembly provided in an embodiment of the utility model;

[0023] Figure 2 for Figure 1 A schematic structural diagram of the battery cell cover assembly from another angle shown;

[0024] Figure 3 for Figure 1 A schematic structural diagram of a cell cover plate main body of a cell cover plate assembly shown;

[0025] Figure 4 for Figure 1 A schematic structural diagram of a liquid injection connector of a cell cover assembly shown;

[0026] Figure 5 for Figure 4 A schematic structural diagram of the liquid injection connector from another angle;

[0027] Figure 6 for Figure 1 A schematic structural diagram of a fixed pressure plate of a cell cover assembly shown;

[0028] Figure 7 for Figure 1 The schematic diagram of the structure of the connection between the liquid injection connector of the battery cover assembly and the fixed pressure plate is shown.

[0029] Icon: 100-battery cell cover body; 101-liquid injection hole; 102-first fixing groove; 103-second fixing groove; 200-liquid injection connector; 201-connector body; 202-upper clamping protrusion; 2021-bending groove; 203-lower clamping protrusion; 204-upper reinforcement ring; 205-reinforcement rib; 206-through hole; 300-fixed pressure plate; 301-connecting hole; 302-supporting annular plate; 303-lower assembly groove. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are 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.

[0033] 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.

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0035] Reference Figure 1-Figure 7 The utility model provides a battery cover assembly, including a battery cover body 100, a liquid injection hole 101 is arranged on the battery cover body 100, and a liquid injection connector 200 is mounted on the liquid injection hole 101; a through hole 206 is arranged on the liquid injection connector 200, and the through hole 206 connects the upper and lower ends of the battery cover body 100;

[0036] A fixed pressing plate 300 is mounted on the injection connector 200 . The fixed pressing plate 300 is disposed on the lower end surface of the cell cover body 100 . A connecting hole 301 is disposed concentrically with the through hole 206 on the fixed pressing plate 300 .

[0037] In some embodiments, a liquid injection hole 101 is provided on the cell cover plate body 100 of the cell cover plate assembly, and the liquid injection connector 200 is assembled into the liquid injection hole 101 from the lower end surface of the cell cover plate body 100; and the upper and lower ends of the liquid injection connector 200 both extend from the liquid injection hole 101; a through hole 206 is provided on the liquid injection connector 200; the liquid injection nozzle is inserted into the through hole 206 of the liquid injection connector 200, and the liquid injection connector 200 wraps the front end of the liquid injection nozzle, which can improve the air tightness; the liquid injection nozzle can be connected with the lower end surface of the cell cover plate body 100 through the through hole 206.

[0038] In order to prevent the injection connector 200 from detaching from the injection hole 101, a fixed pressure plate 300 is installed on the lower end surface of the injection connector 200. The fixed pressure plate 300 is arranged on the lower end surface of the battery cover body 100, and has a connecting hole 301 on the fixed pressure plate 300. The connecting hole 301 is arranged corresponding to the through hole 206, so as to prevent the fixed pressure plate 300 from affecting the injection of electrolyte; the fixed pressure plate 300 can be fixed on the battery cover body 100, and the fixed pressure plate 300 can prevent the injection connector 200 from detaching from the injection hole 101.

[0039] In an optional embodiment, the liquid injection connector 200 is made of rubber.

[0040] Generally, the material of the liquid injection connector 200 is rubber. When the liquid injection connector 200 is assembled in the liquid injection hole 101, the liquid injection connector 200 can be deformed; and when the liquid injection nozzle is inserted into the liquid injection connector 200, the liquid injection connector 200 can wrap the lower end of the liquid injection nozzle.

[0041] In an optional embodiment, the injection connector 200 includes a connector body 201, a lower clamping protrusion 203 is provided at the lower end of the connector body 201, and the outer diameter of the lower clamping protrusion 203 is greater than the inner diameter of the injection hole 101;

[0042] An upper clamping protrusion 202 is disposed at the upper end of the connector body 201 , and the outer diameter of the upper clamping protrusion 202 is greater than the inner diameter of the liquid injection hole 101 .

[0043] In some embodiments, a lower snap-fit ​​protrusion 203 is provided at the lower end of the connector body 201 of the liquid injection connector 200, and the connector body 201 is inserted into the liquid injection hole 101 from the lower end surface of the battery cover plate body 100, and the lower snap-fit ​​protrusion 203 is located outside the liquid injection hole 101, and the outer diameter of the lower snap-fit ​​protrusion 203 is larger than the inner diameter of the liquid injection hole 101, and the lower snap-fit ​​protrusion 203 is not easy to enter the liquid injection hole 101.

[0044] The upper end of the connector body 201 has an upper snap-fit ​​protrusion 202. Since the liquid injection connector 200 is made of rubber, the upper snap-fit ​​protrusion 202 can be deformed when subjected to external force, so that the upper snap-fit ​​protrusion 202 can be inserted into the liquid injection hole 101 and extend from the upper end of the liquid injection hole 101.

[0045] In an optional embodiment, an upper reinforcing ring 204 is disposed on the upper end surface of the lower clamping protrusion 203 ; and a first fixing groove 102 matching the upper reinforcing ring 204 is disposed on the battery cell cover body 100 .

[0046] Reference Figure 4 , Figure 5and Figure 6 In an optional embodiment, a reinforcing rib 205 is provided in the upper reinforcing ring 204, and the reinforcing rib 205 is provided on the upper end surface of the lower clamping protrusion 203, and one end of the reinforcing rib 205 is connected to the connector body 201, and the other end is connected to the upper reinforcing ring 204;

[0047] The cell cover body 100 is provided with a second fixing groove 103 matching the reinforcing rib 205 , and the second fixing groove 103 is communicated with the first fixing groove 102 .

[0048] In order to keep the liquid injection connector 200 fixed relative to the liquid injection hole 101, an upper reinforcing ring 204 and a reinforcing rib 205 are provided on the lower clamping protrusion 203, and a first fixing groove 102 and a second fixing groove 103 are provided on the battery cover body 100;

[0049] Under the action of the fixed pressing plate 300, the upper reinforcing ring 204 of the lower clamping protrusion 203 of the liquid injection connector 200 is kept assembled in the first fixed groove 102, and the reinforcing rib 205 is kept assembled in the second fixed groove 103; the reinforcing rib 205 prevents the liquid injection connector 200 from rotating, even if the liquid injection connector 200 and the liquid injection hole 101 do not rotate relative to each other. This can effectively ensure that the liquid injection connector 200 does not rotate after assembly, thereby causing wear and leakage.

[0050] Reference Figure 4 In an optional embodiment, two curved grooves 2021 are provided on the upper clamping protrusion 202 , and the two curved grooves 2021 are symmetrically arranged on the upper clamping protrusion 202 .

[0051] In an optional embodiment, four bending grooves 2021 are provided on the upper clamping protrusion 202 , and the four bending grooves 2021 are evenly arranged on the upper clamping protrusion 202 .

[0052] Generally, at least two curved grooves 2021 are provided on the upper clamping protrusion 202 , and three curved grooves 2021 or four curved grooves 2021 may also be provided; a protrusion matching the curved groove 2021 is provided on the liquid injection nozzle, so that assembly can be facilitated.

[0053] In an optional embodiment, the fixed pressure plate 300 has a lower assembly groove 303 , and the lower end of the injection connector 200 matches the lower assembly groove 303 , and the through hole 206 provided on the fixed pressure plate 300 is connected to the lower assembly groove 303 .

[0054] Reference Figure 6In an optional embodiment, a supporting annular plate 302 is provided at the upper end of the fixed pressing plate 300 , and the supporting annular plate 302 is used to abut against the battery cell cover plate body 100 .

[0055] A lower assembly groove is provided on the fixed pressure plate 300, and the lower end of the liquid injection connector 200 is assembled in the lower assembly groove, and the liquid injection hole 101 is concentrically arranged with the connection hole 301, so that the fixed pressure plate 300 can fix the liquid injection connector 200 without affecting the injection of electrolyte.

[0056] The supporting annular plate 302 is generally connected to the battery cell cover plate body 100 , for example, by gluing or plastic welding, and the material of the fixed pressing plate 300 is generally plastic.

[0057] The battery cover plate body 100 of the battery cover plate assembly provided by the utility model has a liquid injection hole 101, and the liquid injection connector 200 is assembled in the liquid injection hole 101, and the upper and lower ends of the liquid injection connector 200 extend from the liquid injection hole 101; when liquid injection is required, the liquid injection nozzle can be inserted into the through hole 206 of the liquid injection connector 200, so that the traditional extrusion connection is converted into a connection mode with 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;

[0058] The fixed pressing plate 300 is disposed on the battery cover body 100 and connected to the liquid injection connector 200 , which can effectively prevent the liquid injection connector 200 from detaching from the liquid injection hole 101 , so that the liquid injection connector 200 can be firmly fixed on the liquid injection hole 101 .

[0059] The utility model provides a battery cell, comprising the battery cell cover plate assembly described in any one of the aforementioned implementation modes.

[0060] Compared with the prior art, the battery cell provided by the utility model has the battery cell cover plate assembly provided by the utility model, and thus has all the beneficial effects of the battery cell cover plate assembly provided by the utility model.

[0061] 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 battery cover assembly, characterized in that: The invention comprises a battery cover plate body (100), wherein a liquid injection hole (101) is arranged on the battery cover plate body (100), and a liquid injection connector (200) is mounted on the liquid injection hole (101); a through hole (206) is arranged on the liquid injection connector (200), and the through hole (206) is connected to the upper and lower ends of the battery cover plate body (100); A fixed pressing plate (300) is mounted on the liquid injection connector (200), and the fixed pressing plate (300) is arranged on the lower end surface of the battery cover body (100); a connecting hole (301) is arranged concentrically with the through hole (206) on the fixed pressing plate (300).

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

3. The battery cover assembly according to claim 2, characterized in that: The liquid injection connector (200) comprises a connector body (201), a lower clamping protrusion (203) is provided at the lower end of the connector body (201), and the outer diameter of the lower clamping protrusion (203) is greater than the inner diameter of the liquid injection hole (101); An upper clamping protrusion (202) is provided at the upper end of the connector body (201), and the outer diameter of the upper clamping protrusion (202) is greater than the inner diameter of the liquid injection hole (101).

4. The battery cover assembly according to claim 3, characterized in that: An upper reinforcing ring (204) is arranged on the upper end surface of the lower clamping protrusion (203); and a first fixing groove (102) matching the upper reinforcing ring (204) is arranged on the battery cover body (100).

5. The battery cover assembly according to claim 4, characterized in that: A reinforcing rib (205) is arranged inside the upper reinforcing ring (204), and the reinforcing rib (205) is arranged on the upper end surface of the lower clamping protrusion (203), one end of the reinforcing rib (205) is connected to the connecting member body (201), and the other end is connected to the upper reinforcing ring (204); The cell cover plate body (100) is provided with a second fixing groove (103) matching the reinforcing rib (205), and the second fixing groove (103) is communicated with the first fixing groove (102).

6. The battery cover assembly according to claim 3, characterized in that: Two curved grooves (2021) are arranged on the upper clamping protrusion (202), and the two curved grooves (2021) are symmetrically arranged on the upper clamping protrusion (202).

7. The battery cover assembly according to claim 3, characterized in that: Four curved grooves (2021) are arranged on the upper clamping protrusion (202), and the four curved grooves (2021) are evenly arranged on the upper clamping protrusion (202).

8. The battery cover assembly according to claim 1, characterized in that: The fixed pressing plate (300) has a lower assembly groove (303), and the lower end of the liquid injection connector (200) matches the lower assembly groove (303), and the through hole (206) provided on the fixed pressing plate (300) is connected to the lower assembly groove (303).

9. The battery cover assembly according to claim 8, characterized in that: A supporting annular plate (302) is provided at the upper end of the fixed pressing plate (300), and the supporting annular plate (302) is used to abut against the battery cell cover plate body (100).

10. A battery cell, characterized in that: Comprising the battery cell cover plate assembly according to any one of claims 1 to 9.

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