CN111740039A

CN111740039A - Battery box

Info

Publication number: CN111740039A
Application number: CN201910229553.7A
Authority: CN
Inventors: 茅金健; 缪永华; 范宏军; 周兴; 蔡肖雄
Original assignee: Zhongtian Energy Storage Technology Co Ltd
Current assignee: Zhongtian Energy Storage Technology Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2020-10-02

Abstract

The invention provides a battery box body which comprises a box body, a cover plate, a sealing gasket and a connecting assembly, wherein the sealing gasket is clamped between the box body and the cover plate, the connecting assembly penetrates through the box body, the sealing gasket and the cover plate, the connecting assembly comprises a nut and a screw, the nut is fixed on the box body, the cover plate is fixed on the box body through the cooperation of the screw and the nut, the nut comprises a butting part, the butting part butts against between the box body and the cover plate, the thickness of the butting part is smaller than the initial thickness of the sealing gasket, and the compression amount of the sealing gasket is limited in the process of locking the box body and the cover plate. The battery box body has reliable sealing performance and can effectively avoid the failure of the sealing gasket.

Description

Battery box

Technical Field

The invention relates to the field of battery manufacturing, in particular to a battery box body.

Background

The lithium battery is used as a novel clean energy and widely applied to energy storage power stations, pure electric vehicles and communication backup power supplies. With the wider and wider application of lithium batteries, lithium battery products need to meet the dustproof and waterproof requirements of IP67 in the aspects of safety, performance, use requirements and the like. In order to meet the protection level of IP67, the existing lithium battery sealing mode is that a sealing gasket is arranged between an upper cover plate and a lower box body, and the upper cover plate and the lower box body are fastened and pressed through fastening structures such as screws, nuts and the like, so that the sealing effect is achieved. However, in the fastening process, the pressure of the existing screw and nut on the sealing gasket is not easy to control, when the sealing pressure is too small, the sealing performance is not enough, air leakage is easy, when the sealing pressure is too large, the sealing gasket is easy to deform excessively, the sealing gasket is caused to deform permanently and fail, and the protection grade is difficult to ensure to meet IP 67.

Disclosure of Invention

In view of the above, it is desirable to provide a battery case having reliable sealing performance and capable of preventing the gasket from failing.

The invention provides a battery box body which comprises a box body, a cover plate, a sealing gasket and a connecting assembly, wherein the sealing gasket is clamped between the box body and the cover plate, the connecting assembly penetrates through the box body, the sealing gasket and the cover plate, the connecting assembly comprises a nut and a screw, the nut is fixed on the box body, the cover plate is fixed on the box body through the cooperation of the screw and the nut, the nut comprises a butting part, the butting part is butted between the box body and the cover plate, the thickness of the butting part is smaller than the initial thickness of the sealing gasket, and the compression amount of the sealing gasket is limited in the process of locking the box body and the cover plate.

Further, the nut further comprises a tubular part, and the tubular part and the abutting part are of an integrated structure.

Further, the outer diameter of the abutting portion is larger than that of the tubular portion.

Further, the tubular part comprises an internal thread part and an installation part, the installation part is buckled under the action of an installation tool to expand the diameter, the nut is clamped and embedded in the box body, and the internal thread part is used for being matched with the screw to fix the cover plate on the box body.

Furthermore, the abutting part is provided with a through hole which penetrates through the internal thread part, and the internal thread part is provided with internal threads.

Furthermore, the sealing gasket is provided with a plurality of through holes, and the periphery of the abutting part is tightly attached to the through holes.

Furthermore, the screw comprises a flange, and the flange abuts against one side of the cover plate, which is far away from the box body.

Furthermore, the size of the flange plate is matched with that of the abutting part.

Furthermore, the screw further comprises a screw rod and a screw head, wherein one end, deviating from the screw rod, of the screw head is provided with a recess, and a cross groove is formed in the recess.

Furthermore, one side of the sealing gasket, which is close to the box body, is provided with a glue layer.

The invention provides a battery box body which comprises a box body, a cover plate, a sealing gasket and a connecting assembly, wherein the sealing gasket is clamped between the box body and the cover plate, the connecting assembly penetrates through the box body, the sealing gasket and the cover plate, the connecting assembly comprises a nut and a screw, the nut is fixed on the box body, and the screw is matched with the nut to fix the cover plate on the box body. The nut comprises a supporting part, the supporting part is supported between the box body and the cover plate, the thickness of the supporting part is smaller than the initial thickness of the sealing gasket, the compression amount of the sealing gasket is limited in the process of locking the box body and the cover plate, the sealing gasket is prevented from losing effect due to excessive compression of the sealing gasket, and poor sealing effect due to insufficient compression of the sealing gasket is also avoided. The reliability of the sealing is improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery case according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a connecting assembly in an embodiment of the invention.

Fig. 3A is a schematic structural diagram of a nut in an embodiment of the invention.

Fig. 3B is a schematic structural diagram of deformation of the nut according to an embodiment of the invention.

Fig. 4A is a schematic structural diagram of a screw according to an embodiment of the present invention.

Fig. 4B is a schematic structural view of a screw head according to an embodiment of the invention.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, some, but not all embodiments of the invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

Referring to fig. 1 and 2, the battery case 100 includes a case body 10, a cover plate 20, a gasket 30, and a plurality of connecting members 40. The case 10 is disposed opposite to the cover plate 20, and the gasket 30 is interposed between the case 10 and the cover plate 20. The gasket 30 is used to improve the waterproof and dustproof performance of the battery case 100. The connection assembly 40 serves to fasten the battery case 100 and effectively prevent the gasket 30 from being deteriorated due to excessive compression.

An opening 11 is formed in one side of the box body 10, and a first sealing plate 13 is arranged on the periphery of the edge of the opening 11 in an outward protruding mode. The first sealing plate 13 is provided with a plurality of first mounting holes 15. In one embodiment, the first mounting holes 15 are arranged in series along the circumferential direction of the opening 11. The box 10 is made of metal, injection molded parts, or composite materials, etc., and in one embodiment, the box 10 is substantially a rectangular parallelepiped structure, and the box 10 is formed by sheet metal.

The cover plate 20 is used for sealing the box body 10, a second sealing plate 23 adapted to the first sealing plate 13 is disposed on a surface of the cover plate 20 opposite to the box body 10, and a second mounting hole 25 corresponding to each first mounting hole 15 is disposed on the second sealing plate 23. The cover plate 20 is made of metal, injection molded parts, composite materials, or the like, and in one embodiment, the cover plate 20 has a plate-like or box structure, and in one embodiment, the cover plate 20 has a substantially box structure, and the cover plate 20 is formed by sheet metal.

The sealing gasket 30 is interposed between the first sealing plate 13 and the second sealing plate 23 to improve the waterproof and dustproof performance of the battery case 100. The sealing gasket 30 is provided with a through hole 31 at a position facing the first mounting hole 15 and the second mounting hole 25. Each through hole 31, the corresponding first mounting hole 15 and the corresponding second mounting hole 25 form a through mounting hole, so as to facilitate mounting of the connecting assembly 40. A glue layer is arranged on one side of the sealing gasket 30 close to the first sealing plate 13, so that the sealing gasket 30 is bonded on the first sealing plate 13. The gasket 30 may be compressed by external pressure to secure the sealing reliability of the battery case 100. The sealing gasket 30 is made of one or more of sealing foam, rubber or other sealing materials, in one embodiment, the sealing gasket 30 is made of sealing foam, and the thickness of the sealing gasket 30 is 4mm, so that the sealing gasket 30 is prevented from being too thick, and the production cost is reduced.

Referring to fig. 2, the connecting assembly 40 penetrates the box 10, the gasket 30 and the cover plate 20. The connecting assembly 40 includes a nut 41 and a screw 42. Nut 41 is fixed in the first mounting hole 15, nut 41 part centre gripping in the box 10 with between the apron 20, in order to restrict the compressive capacity of sealed pad 30 avoids sealed pad 30 excessive compression leads to sealed pad 30 is inefficacy, also avoids sealed pad 30 compression leads to sealed effect not good inadequately. The screw 42 passes through the second mounting hole 25 to compressively fasten the gasket 30 between the cover plate 20 and the case 10.

Referring to fig. 3A, the nut 41 includes a tubular portion 411 and an abutting portion 413. The tubular portion 411 and the abutting portion 413 are of an integral structure. The tubular portion 411 includes an internal threaded portion 4111 and a mounting portion 4113. The inner side of the inner thread portion 4111 is provided with an inner thread, and the inner thread is used for being matched and fastened with the screw 42. In one embodiment, the internal thread portion 4111 is cylindrical. The mounting portion 4113 is connected to one end of the internal thread portion 4111. As shown in fig. 3A to 3B, the mounting portion 4113 has a thin wall so that the nut 41 is riveted and fixed to the box 10 by a tool to be bent during mounting. Specifically, the mounting portion 4113 is pressed by a mounting tool to expand the diameter thereof to form an expanded diameter portion 4113a, and the expanded diameter portion 4113a engages the nut 41 in the first mounting hole 15. In one embodiment, the mounting portion 4113 is cylindrical.

The abutting portion 413 is arranged at one end of the mounting portion 4113 deviating from the internal thread portion 4111. The outer diameter of the abutting portion 413 is larger than that of the tubular portion 411 so as to clamp the nut 41 on the first mounting hole 15, thereby limiting the compression amount of the gasket 30. In one embodiment, the abutting portion 413 is substantially cylindrical, and the radius of the abutting portion 413 is 7 mm. Under the same screw fastening force, the pressure applied to the case 10 and the cover plate 20 is reduced relative to a conventional nut, so as to prevent the cover plate 20 from being deformed by being pressed at the position where the screw 42 is installed. The periphery of the abutting portion 413 is tightly attached to the through hole 31 of the sealing gasket 30, the abutting portion 413 abuts between the first sealing plate 13 and the second sealing plate 23, when the sealing gasket 30 is compressed by the first sealing plate 13 and the second sealing plate 23, the abutting portion 413 can limit the compression amount of the sealing gasket 30, the sealing gasket 30 is prevented from being failed due to excessive compression of the sealing gasket 30, and the sealing effect is also prevented from being poor due to insufficient compression of the sealing gasket 30. Specifically, the thickness of the abutting portion 413 is set according to the compression amount of the gasket 30, in an embodiment, the sealing effect of the gasket 30 is better when the compression amount is 50%, and the thickness of the abutting portion 413 is 50% of the initial thickness of the gasket 30. In one embodiment, the thickness of the supporting portion 413 is 2 mm.

The abutting portion 413 has a through hole 4131. The through hole 4131 penetrates the female screw portion 4111 to allow the screw 42 to pass therethrough. In one embodiment, the size of the nut 41 ranges from M3 to M8, for example, the size of the nut 41 is M5, so as to reduce the volume of the battery case 100 and the production cost. The nut 41 is made of stainless steel, carbon steel, or aluminum alloy, and in one embodiment, the nut 41 is made of stainless steel.

Referring to fig. 4A and 4B, the screw 42 includes a screw 421, a flange 423, and a screw head 425 connected in sequence.

The screw 421 is substantially cylindrical, and the screw 421 is provided with an external thread matching with the internal thread portion 4111 to cooperate with the nut 41 to achieve a fastening effect. The flange 423 abuts against a side of the cover plate 20 facing away from the tank 10. The radius of the flange 423 is matched with the radius of the abutting part 413, so that the stress of the cover plate 20 is uniform, the cover plate 20 is prevented from deforming, and the sealing reliability is improved. In one embodiment, the flange 423 has a disc shape, and the radius of the flange 423 is equal to the radius of the abutting portion 413 and is 7 mm. The end of the screw head 425 away from the screw 421 is provided with a recess 4251, and the recess 4251 is provided with a cross groove 4253, so that the screw 42 can be assembled and disassembled by using a sleeve or a cross screwdriver, and the installation operation is convenient. The screw 42 is made of stainless steel, carbon steel, or aluminum alloy, and in one embodiment, the screw 42 is made of stainless steel.

When the battery box 100 is used, the nut 41 is fixed on the box 10 by an installation tool; specifically, the mounting portion 4113 is pressed by a mounting tool to expand the diameter thereof, and the nut 41 is fitted into the first mounting hole 15. Adhering the sealing gasket 30 to the case 10; placing a battery to be sealed in the case 10 through the opening 11; covering the cover plate 20 on the box body 10, and clamping the sealing gasket 30 between the cover plate 20 and the box body 10; specifically, when the gasket 30 is compressed by the case 10 and the cover 20, the abutting portion 413 may limit the compression amount of the gasket 30. The screw 42 penetrates the cover plate 20 to compressively fasten the gasket 30 between the cover plate 20 and the case 10. The battery box 100 controls the compression amount of the sealing gasket 30 through the connecting assembly 40, and reduces the local pressure on the box 10 and the cover plate 20, so as to ensure the sealing reliability of the battery box 100.

Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims

1. The utility model provides a battery box, includes box, apron, sealed pad and coupling assembling, sealed pad clamp is located the box with between the apron, coupling assembling runs through box, sealed pad and apron, coupling assembling includes nut and screw, the nut is fixed in on the box, the screw is fixed in with the apron with the nut cooperation on the box, its characterized in that: the nut comprises a supporting part, the supporting part is supported between the box body and the cover plate, the thickness of the supporting part is smaller than the initial thickness of the sealing gasket, and the compression amount of the sealing gasket is limited in the process of locking the box body and the cover plate.

2. The battery case according to claim 1, characterized in that: the nut further comprises a tubular part, and the tubular part and the abutting part are of an integrated structure.

3. The battery case according to claim 2, characterized in that: the outer diameter of the abutting part is larger than that of the tubular part.

4. The battery case according to claim 2, characterized in that: the tubular part comprises an internal thread part and an installation part, the installation part is buckled under the action of an installation tool to expand the diameter, the nut is clamped and embedded in the box body, and the internal thread part is used for being matched with the screw to fix the cover plate on the box body.

5. The battery case according to claim 4, characterized in that: the abutting part is provided with a through hole which penetrates through the internal thread part, and the internal thread part is provided with internal threads.

6. The battery case according to claim 1, characterized in that: the sealing gasket is provided with a plurality of through holes, and the periphery of the abutting part is tightly attached to the through holes.

7. The battery case according to claim 1, characterized in that: the screw comprises a flange plate, and the flange plate is abutted to one side of the cover plate, which is far away from the box body.

8. The battery case according to claim 7, characterized in that: the size of the flange plate is matched with that of the abutting part.

9. The battery case according to claim 1, characterized in that: the screw further comprises a screw rod and a screw head, wherein one end, deviating from the screw rod, of the screw head is provided with a recess, and a cross groove is formed in the recess.

10. The battery case according to claim 1, characterized in that: one side of the sealing gasket, which is close to the box body, is provided with a glue layer.