CN204760442U - Battery cover plate assembly and use battery of this subassembly - Google Patents

Abstract

The utility model relates to a battery cover plate assembly and use battery of this subassembly. This battery cover plate assembly is including the apron, wear to be equipped with the axis on the apron and extend utmost point post along upper and lower direction, utmost point post includes the cylinder respectively and sets up the flange at the cylinder lower extreme, it is equipped with the sealing washer to press from both sides between the flange up end of apron downside and utmost point post, it is used for pressing from both sides the sealing washer piece of tightly lapping between downside and the flange that compresses tightly to be equipped with in the apron upside on the utmost point post. The utility model discloses well sealing washer is pressed from both sides tightly between the up end of lapping downside and utmost point post flange, and the upper and lower both sides of sealing washer receive the extrusion back and to lapping and extremely sealing, reach good sealed effect between the post. The purpose of the utility model is to provide a still provide a battery that uses this battery cover plate assembly.

Description

A battery cover assembly and a battery using the same

technical field

The utility model relates to a battery cover assembly and a battery using the assembly.

Background technique

At present, lithium batteries include a metal case and a cover plate assembly fixedly connected to the metal case. The cover plate assembly includes a cover plate, a lead piece, and positive and negative poles. The cover plate assembly and the metal case are fixed to form a sealed structure. If the structure of the cover plate assembly is unreasonable, it will directly affect the performance of the battery. Therefore, a reasonable cover plate assembly is required to cooperate with the battery cell and the metal case.

In the prior art, such as a battery cover disclosed in a Chinese utility model patent with an announcement date of 2014.07.16 and an announcement number of CN203721784U, the battery cover includes a cover body, a positive pole, a positive lead, a negative pole and Negative lead piece, positive pole and negative pole are integrally formed by the base and the pole respectively, and the base is provided with a perforation for the rivet to pass through. When assembling, the positive pole is set on the upper side of the cover body, and the positive lead piece It is arranged on the lower side of the cover body, and a positive rivet is installed in the base of the positive pole. The positive pole and the positive tab are fixed on the cover body through the positive rivet. A sealing gasket is interposed, and a sealing gasket is sandwiched between the positive electrode lead piece and the lower side of the cover plate body, and the positive pole pole and the positive electrode lead piece are connected by a positive electrode rivet. The connection mode of the negative pole pole, the negative pole lead piece and the cover plate body is the same as the connection mode of the positive pole pole, the positive pole lead piece and the cover plate body. Because the poles and lead pieces in the battery cover are connected by rivet compaction, the internal resistance of the battery is relatively large, and the internal heat of the battery increases during use, which consumes a large amount of energy stored in the battery, resulting in low power utilization. The use performance of the battery is poor; at the same time, the internal heat of the battery increases, which will destroy the energy storage material inside the battery, thereby shortening the service life of the battery.

In order to solve the above problems, there is a battery cover disclosed in the Chinese utility model patent with the announcement date of 2014.10.08 and the announcement number CN203871392U. The battery cover includes a cover body, a positioning plate, positive and negative electrodes Pole, the positioning plate is set on the lower side of the cover body, the lower ends of the positive and negative poles are provided with flanges, and the cover body and the positioning plate are correspondingly provided with pole perforations for the positive and negative poles to wear. When the battery cover is assembled, the positive and negative poles are respectively installed in the corresponding pole perforations, the flanges of the positive and negative poles are matched with the lower side of the positioning plate, and the upper ends of the positive and negative poles are covered with The electrode pressure plate and the electrode tab are fixed on the lower end of the positive and negative poles by welding, which solves the problem of increased internal resistance caused by riveting. In order to insulate the electrode pressure plate from the cover body, a gasket is interposed between the positive and negative poles of the battery cover and the cover body. Since the radius of the pole hole is larger than the radius of the positive and negative poles, There is a large gap between the column perforation and the pole. The sealing effect of the gasket between the electrode pressure plate and the cover body is not ideal. In order to further increase the sealing effect, the battery cover has a hole in the pole of the cover body. There is a seal ring between the inner wall and the positive and negative poles. Since the seal ring is inside the perforation, the positive and negative poles have no extrusion effect on the seal ring, so setting the seal ring in the pole perforation cannot achieve a sealing effect. As a result, the sealing effect of the battery cover plate is not good. When the battery cover plate is connected to the metal casing, the sealing effect of the inner cavity of the battery is not good, which easily causes the problem of battery gas leakage.

Utility model content

The purpose of the utility model is to provide a battery cover assembly with good sealing effect, and the purpose of the utility model is also to provide a battery using the assembly.

In order to achieve the above object, the utility model adopts the following technical solutions:

The battery cover plate assembly includes a cover plate, and the cover plate is equipped with poles extending along the vertical direction of the axis. The poles respectively include a cylinder and a flange arranged at the lower end of the cylinder. A sealing ring is sandwiched between the upper end faces of the flanges of the pole, and a pressing piece for clamping the sealing ring between the underside of the cover and the flange is provided on the pole above the cover plate.

The cover plate is provided with a pole hole for the pole to pass through, an insulating upper sealing gasket is sandwiched between the upper side of the cover plate and the pressing member, and the gap between the lower side of the cover plate and the flange of the pole column is An insulating lower sealing gasket is sandwiched between them, and an insulating inner sealing gasket is arranged in the through hole of the pole.

The upper side of the cover plate is provided with an upper groove at the hole at the upper end of the pole perforation, and the lower side of the cover plate is provided with a lower groove at the hole at the lower end of the pole perforation, and the upper sealing gasket is located in the upper groove. The lower sealing gasket is located in the lower sealing groove.

The upper sealing gasket, the sealing gasket in the hole and the lower sealing gasket are of an integral structure.

A lead piece is connected to the lower end surface of the flange of the pole post, and the maximum radius of the pole flange is smaller than the maximum radius of the lead piece.

The pole includes a positive pole and a negative pole, and the leads include a positive lead and a negative lead, the positive lead is an aluminum sheet, and the negative lead is a copper sheet.

The positive electrode lead sheet is an annealed aluminum sheet, and the negative electrode lead sheet is an annealed copper sheet.

The battery includes a battery casing, and the battery cover assembly as described above is connected to the battery casing.

Beneficial technical effects of the utility model: the pole includes a cylinder and a flange arranged at the lower end of the cylinder, the pole is mounted on the cover plate, and the pole is connected with a pressing piece on the upper side of the cover so that the pole is covered. Fixed on the cover plate, in order to achieve the sealing effect, a sealing ring is provided between the lower side of the cover plate and the upper end surface of the flange, and the sealing ring is clamped between the lower side of the cover plate and the flange under the pressing action of the pressing part During the interval, the upper side and the lower side of the sealing ring are squeezed, and then the cover plate and the pole are sealed to achieve a good sealing effect, and because the sealing ring isolates the cover plate and the pole, the flange part of the pole is avoided. Conductive connection to the inside of the battery. The pole of the utility model is mounted on the cover plate, and the end of the pole is provided with a pressing piece, which has a simple structure and is convenient to install, not only saves material cost, but also improves production efficiency.

As a further improvement, the utility model is provided with an insulating upper sealing gasket between the upper side of the cover plate and the pressing member, and an insulating lower sealing gasket is provided between the lower side of the cover plate and the upper end surface of the flange, and the pole There are insulating sealing gaskets in the hole. The three sealing gaskets can isolate the cover plate from the pole, prevent the conductive connection between the separator and the pole from causing a short circuit of the battery, and at the same time make the cover plate and the pole Between to achieve a better sealing effect.

Further, the upper sealing gasket, the sealing gasket in the hole and the lower sealing gasket are integrally structured. When the upper sealing gasket part and the lower sealing gasket part are compressed and deformed, the sealing gasket part in the hole will also be squeezed. Compression deformation, so that the inner wall of the pole perforation and the pole are sealed, and the sealing effect is further achieved.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the battery cover assembly in the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is an enlarged view of part A in Fig. 1;

In the figure: 1. Cover plate, 2. Negative pole pole, 3. Negative pole nut, 4. Seal ring, 5. Ring sealing gasket, 6. Positive pole lead piece, 7. Negative pole lead piece, 8. Protective cover, 9 , Explosion-proof film, 10, positive pole pole, 11, positive pole nut, 12, liquid injection hole.

detailed description

Embodiment 1 of the battery cover assembly of the present utility model, as shown in Figure 1, Figure 2 and Figure 3, the battery cover assembly includes a cover plate 1, an explosion-proof hole is opened on the cover plate 1, and a protective cover is provided on the explosion-proof hole 8. The protective cover 8 is fixed on the cover plate 1 by laser spot welding, and an explosion-proof film 9 is sandwiched between the upper side of the cover plate 1 and the protective cover 8 . The cover plate 1 is equipped with a positive pole 10 and a negative pole 2 whose axes extend in the up and down direction. The positive pole 10 and the negative pole 2 are symmetrical about the explosion-proof hole, and the positive pole 10 and the negative pole 2 respectively include cylinders. and a flange arranged at the lower end of the cylinder, the cylinder is provided with external threads, and the positive pole 10 and the negative pole 2 are correspondingly provided with pressure for fixing the positive pole 10 and the negative pole 2 on the cover plate 1 Compression piece, in this embodiment, the compression piece is the positive pole nut 11 that is screwed on the positive pole pole 10, the negative pole nut 3 that is screwed on the negative pole pole 2, in other embodiments, the pressure piece can also be A pressing plate sleeved on the positive pole and the negative pole.

In order to achieve the effect of sealing and insulation, an insulating and sealing structure is provided between the positive pole 10, the negative pole 2 and the cover plate 1. The insulating and sealing structures at the positions of the positive pole and the negative pole are the same, and the positive pole The insulating and sealing structure at the position is described as an example: a sealing ring 4 is sandwiched between the lower side of the cover plate 1 and the upper end surface of the flange of the positive pole, and the sealing ring 4 is an O-type EPDM sealing ring. The high temperature is 120°C. The upper and lower sides of the sealing ring 4 are respectively sealed with the lower side of the cover plate and the upper end surface of the flange. Tighten the positive nut 11 to clamp the sealing ring between the cover plate and the positive pole. The sealing ring 4 The pressure deformation achieves the sealing effect. Due to the function of the sealing ring, the underside of the cover plate is insulated from the upper end surface of the flange of the positive electrode pole to prevent the battery from short circuiting.

The cover plate 1 of the battery cover plate assembly is provided with a pole piercing hole for the positive pole pole to wear, and an insulating ring-shaped ring sealing gasket 5 is provided on the cover plate 1 and the position of the pole piercing hole. The cross section of 5 is U-shaped, and the U-shaped opening of the annular sealing gasket 5 faces outward. The annular sealing gasket 5 includes an upper sealing gasket part sandwiched between the upper side of the cover plate 1 and the lower end surface of the positive nut 11 , the lower sealing gasket part sandwiched between the lower side of the cover plate 1 and the upper end surface of the positive pole flange, and the sealing gasket part in the hole arranged between the inner wall of the pole hole and the positive pole; in this embodiment , the upper sealing gasket part, the sealing gasket part in the hole and the lower sealing gasket part are integrally structured, the upper side of the cover plate 1 is provided with an upper groove at the upper port of the pole perforation, and the upper sealing gasket of the ring sealing gasket The sheet part is located in the upper groove, and the lower side of the cover plate is provided with a lower groove at the lower port of the pole perforation, and the lower sealing gasket part of the ring sealing gasket 5 is located in the lower groove. In other embodiments, the upper sealing gasket part, the inner sealing gasket part and the lower sealing gasket part may be arranged separately, and the upper and lower grooves may not be provided on the cover plate. The maximum radius of the upper sealing gasket part of the annular sealing gasket 5 is greater than the radius of the positive nut, the maximum radius of the lower sealing gasket part of the annular sealing gasket is smaller than the maximum radius of the flange, and the sealing ring 4 is located on the lower sealing gasket part outside. When the positive pole is fixed on the cover plate under the compression of the positive nut, the upper sealing gasket part and the lower sealing gasket part of the ring sealing gasket 5 are respectively compressed and deformed, so that the hole located in the through hole of the pole The part of the inner sealing gasket is also squeezed and deformed, thereby sealing between the cover plate and the positive pole, further increasing the sealing effect.

In the utility model, the positive pole lead piece 6 is welded on the lower end surface of the positive pole pole flange, the radius of the positive pole lead piece 6 is larger than the radius of the positive pole pole flange, and the negative pole lead piece 7 is welded on the lower end surface of the negative pole pole flange. , the radius of the negative lead piece 7 is greater than the radius of the flange of the negative pole column. In other embodiments, the positive lead piece and the negative lead piece may be equal to or smaller than the radius of the flange.

The positive lead piece 6 is an aluminum sheet with a thickness of 0.5mm, and the negative lead piece 7 is a copper sheet with a thickness of 0.5mm. hardness, to avoid the positive and negative tabs from bending and contacting the cover plate. In other embodiments, the positive tabs and the negative tabs can be both aluminum sheets or copper sheets. When welding the positive lead and the negative lead, the positive lead and the negative lead are respectively positioned on the corresponding pole end faces by laser spot welding, and then the positive lead and the negative lead are fixed by ultrasonic welding, and the positive pole Internally threaded holes are provided on the upper end surface of the negative pole and the negative pole, and a liquid injection hole 12 is provided on the cover plate 1 .

Embodiment 1 of the battery of the present utility model, the battery includes a metal shell, a battery cover assembly is connected to the metal shell, the battery cover assembly and the metal shell form a sealed inner cavity, and the structure of the battery cover assembly is as described above, as follows: To avoid repetition, I will not elaborate here.

Claims (8)

1. The battery cover plate assembly, including a cover plate, the cover plate is equipped with poles extending along the vertical direction of the axis, and it is characterized in that: the poles respectively include a cylinder and a flange arranged at the lower end of the cylinder, so A sealing ring is sandwiched between the lower side of the cover plate and the upper end surface of the flange of the pole, and the upper side of the cover plate is provided on the pole for clamping the sealing ring between the lower side of the cover plate and the flange. Compression piece. 2. The battery cover plate assembly according to claim 1, characterized in that: the cover plate is provided with a pole through hole for the pole to pass through, and an upper side of the cover plate and the pressing member are sandwiched between An insulating upper sealing gasket, an insulating lower sealing gasket is sandwiched between the lower side of the cover plate and the flange of the pole, and an insulating inner sealing gasket is provided in the through hole of the pole. 3. The battery cover plate assembly according to claim 2, characterized in that: the upper side of the cover plate is provided with an upper groove at the hole at the upper end of the pole perforation, and the lower side of the cover plate is at the hole at the lower end of the pole perforation A lower groove is provided, the upper sealing gasket is located in the upper groove, and the lower sealing gasket is located in the lower sealing groove. 4. The battery cover assembly according to claim 2 or 3, characterized in that: the upper sealing gasket, the sealing gasket in the hole and the lower sealing gasket are integrally constructed. 5. The battery cover assembly according to any one of claims 1, 2 or 3, characterized in that a lead piece is connected to the lower end surface of the flange of the pole, and the maximum radius of the flange of the pole is less than The maximum radius of the tab. 6. The battery cover assembly according to claim 5, wherein the pole includes a positive pole and a negative pole, the lead sheet includes a positive lead piece and a negative lead piece, and the positive lead piece is Aluminum sheet, negative lead sheet is copper sheet. 7 . The battery cover assembly according to claim 6 , wherein the positive electrode lead piece is an annealed aluminum sheet, and the negative electrode lead piece is an annealed copper sheet. 8. A battery, comprising a battery case, characterized in that the battery cover assembly according to any one of claims 1-7 is connected to the battery case.