阅读说明：本技术 一种动力电池顶盖及其制造方法 (Power battery top cover and manufacturing method thereof ) 是由 戈志敏 皮玉平 程宝利 周威 唐姣君 丁建明 胡艳兰 帅庚洪 曾招龙 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种动力电池顶盖,包括：顶盖板,其上设置有极柱孔；固定件,固定在顶盖板上,其具有限位凸缘；极柱件,位于固定件内,其上具有限位凸台,限位凸台与限位凸缘竖向对齐；绝缘的密封圈,垫设于极柱件与顶盖板之间并与极柱孔对齐；绝缘的上塑件,包裹在固定件外且填充极柱件与固定件之间的间隙,本动力电池顶盖结构牢固度搞,结构简单,零部件少,方便制造和生产装配,有助于提高生产效率。本发明还公开了一种动力电池顶盖的制造方法,包括步骤：将固定件通过激光焊接方式固定在顶盖板上；将密封件和极柱件置于固定件内；转动极柱件；利用注塑方式成型出上塑件；装配下塑件,本制造方法设备成本较低,能够有效提高优品率。(The invention discloses a power battery top cover, which comprises: the top cover plate is provided with a pole column hole; the fixing piece is fixed on the top cover plate and is provided with a limiting flange; the pole column piece is positioned in the fixing piece and is provided with a limiting boss, and the limiting boss is vertically aligned with the limiting flange; the insulating sealing ring is arranged between the pole column piece and the top cover plate in a cushioning mode and is aligned with the pole column hole; the insulating piece of moulding of going up, the parcel just fills the clearance between utmost point post spare and the mounting outside the mounting, and this power battery top cap structure firmness is done, simple structure, and spare part is few, conveniently makes and production assembly, helps improving production efficiency. The invention also discloses a manufacturing method of the power battery top cover, which comprises the following steps: fixing the fixing piece on the top cover plate in a laser welding mode; placing the sealing element and the pole piece in the fixing element; rotating the pole piece; forming an upper plastic part by using an injection molding mode; the lower plastic part is assembled, the manufacturing method has lower equipment cost, and the high-quality product rate can be effectively improved.)

1. A power battery top cap, characterized by, includes:

the top cover plate (10), the top cover plate (10) is provided with a pole column hole (11);

the fixing piece (20) is fixed on the top cover plate (10) and surrounds the outside of the pole column hole (11), a lateral limiting flange (21) which is located at a distance above the top cover plate (10) and extends towards the inner side is arranged on the fixing piece (20), and a first through hole (22) is formed in the top end of the fixing piece (20);

the pole column piece (30) is positioned in the fixing piece (20) and is vertically aligned with the pole column hole (11), a lateral limiting boss (31) matched with the limiting flange (21) is arranged on the pole column piece (30), and the limiting boss (31) is vertically aligned with the limiting flange (21); when the pole column piece (30) rotates relative to the fixing piece (20) until the lug boss is staggered with the flange, the first through hole (22) can be used for the pole column piece (30) to pass through; the inner wall of the fixing piece (20) is separated from the outer wall of the pole column piece (30) by a distance;

an insulating seal ring (40) interposed between said post member (30) and said top cover plate (10) and aligned with said post aperture (11) for spacing said seal member from said top cover plate (10); the first through hole (22) is used for the sealing element to pass through;

the insulating upper plastic piece (50) wraps the fixing piece (20) and fills a gap between the pole post piece (30) and the fixing piece (20) to separate the fixing piece (20) from the pole post piece (30); the top of the upper plastic part (50) is provided with a second through hole (51) which is aligned with the pole piece (30).

2. A power cell cover according to claim 1, wherein the upper part of the pole piece (30) extends above the upper molding member (50) through the second through hole (51).

3. A top cover for a power battery according to claim 1, wherein the upper molding member (50) is injection molded on the fixing member (20) to wrap the fixing member (20) and fill the gap between the pole member (30) and the fixing member (20).

4. The top cover of the power battery as claimed in claim 1, wherein the fixing member (20) is fixed on the top cover plate (10) by laser welding.

5. The top cover of the power battery as claimed in claim 1, wherein the top of the top cover plate (10) is provided with a positioning groove (12) matched with the bottom of the fixing member (20), and the bottom of the fixing member (20) is inserted into the positioning groove (12).

6. The top cover of the power battery as claimed in claim 1, wherein the top of the top cover plate (10) is provided with a first boss (13) surrounding the pole hole (11), and the inner hole of the sealing ring (40) is matched with the first boss (13) and sleeved outside the first boss (13).

7. The top cover of the power battery as claimed in claim 1, wherein a lower molding member (50) is mounted at the bottom of the top cover plate (10), the lower molding member (50) has a third through hole aligned with the pole hole (11) and a second boss (62) surrounding the third through hole, and the second boss (62) is adapted to the pole hole (11) and inserted into the pole hole (11).

8. The power battery top cover according to claim 7, wherein a clamping groove (71) or a clamping block (72) is formed in the bottom of the top cover plate (10), the clamping block (72) or the clamping groove (71) is correspondingly formed in the top of the lower plastic part (50), a protruding portion (73) is arranged in the middle of the clamping groove (71), and the clamping block (72) is matched with the clamping groove (71) and clamped in the clamping groove (71) to fixedly mount the lower plastic part (50) on the top cover plate (10).

9. A method for manufacturing a top cover of a power battery, which is used for manufacturing the top cover of the power battery as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:

preparing a top cover plate (10), a fixing piece (20), a pole piece (30), a sealing piece and a lower plastic piece (50), and fixing the fixing piece (20) on the top cover plate (10) in a laser welding mode;

secondly, the sealing element and the pole column element (30) are sequentially arranged in the fixing element (20) through the first through hole (22) of the fixing element (20);

rotating the pole column piece (30) to enable a limiting boss (31) on the pole column piece (30) to be aligned with a limiting flange (21) on the fixing piece (20) to obtain a pre-assembly body;

step four, forming an upper plastic part (50) which is wrapped in the fixing part (20) and fills the gap between the fixing part (20) and the pole column part (30) on the pre-assembly body in an injection molding mode;

and step five, assembling the lower plastic part (50) to the bottom of the top cover plate (10).

10. The method for manufacturing the top cover of the power battery as claimed in claim 9, wherein the pole pieces (30) are made of copper-aluminum composite plates by stamping.

Technical Field

The invention relates to the technical field of batteries, in particular to a power battery top cover and a manufacturing method of the power battery top cover.

Background

Industries such as electric automobiles, energy storage industry, electric tools and the like are developed rapidly nowadays, a power battery is an important component of related industries, various performances of corresponding products are directly affected, and the demand for the power battery is vigorous day by day. Power battery has lead acid battery, multiple structures such as lithium ion battery, contain the shell usually, electric core and top cap, the electric core is located the shell and by the top cap encapsulation, the top cap includes the lamina tecti and sets up the utmost point post on the lamina tecti, utmost point post is used for being connected electric core and external power consumption device, lamina tecti and utmost point post are usually for the metal material in order to guarantee structural strength, consequently, it is insulating to accomplish between lamina tecti and the utmost point post, and also need sealed in order to prevent revealing between lamina tecti and the utmost point post, current top cap adopts the riveting usually, modes such as friction welding are made and are assembled, the structure is complicated, require highly to equipment, the cost is also higher, and corresponding manufacturing and assembly mode need utmost point post to have longer length, lead to the inside space utilization of battery lower, the product dead weight is heavier, it is great to battery capacity.

Disclosure of Invention

The invention aims to solve at least one of the technical problems in the prior art, and provides a power battery top cover which is novel in structure, convenient to produce and firm in structure, and a manufacturing method of the power battery top cover, wherein the manufacturing method can reduce the production cost.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a power cell header comprising:

the top cover plate is provided with a pole column hole;

the fixing piece is fixed on the top cover plate and surrounds the outside of the pole column hole, a lateral limiting flange which is positioned at a distance above the top cover plate and extends towards the inner side is arranged on the fixing piece, and a first through hole is formed in the top end of the fixing piece;

the pole column piece is positioned in the fixing piece and vertically aligned with the pole column hole, a lateral limiting boss matched with the limiting flange is arranged on the pole column piece, and the limiting boss is vertically aligned with the limiting flange; when the pole piece rotates relative to the fixing piece until the lug boss is staggered with the flange, the first through hole can be used for the pole piece to pass through; the inner wall of the fixing piece and the outer wall of the pole piece are separated by a distance;

the insulating sealing ring is arranged between the pole piece and the top cover plate in a cushioning manner, is aligned with the pole hole and is used for separating the sealing piece from the top cover plate; the first through hole is used for the sealing element to pass through;

the insulating upper plastic part wraps the fixing part and fills the gap between the pole post part and the fixing part to separate the fixing part from the pole post part; the top of the upper plastic part is provided with a second through hole aligned with the pole piece.

Preferably, the upper part of the pole piece passes through the second through hole and extends to the upper part of the upper plastic piece.

Preferably, the upper molding part is formed on the fixing part in an injection molding mode so as to wrap the fixing part and fill the gap between the pole column part and the fixing part.

Preferably, the fixing member is fixed to the top cover plate by laser welding.

Preferably, the top of the top cover plate is provided with a positioning groove matched with the bottom of the fixing piece, and the bottom of the fixing piece is inserted into the positioning groove.

Preferably, the top of the top cover plate is provided with a first boss surrounding the pole column hole, and the inner hole of the sealing ring is matched with the first boss and sleeved outside the first boss.

Preferably, a lower plastic part is mounted at the bottom of the top cover plate, a third through hole aligned with the pole hole and a second boss surrounding the third through hole are formed in the lower plastic part, and the second boss is matched with the pole hole and inserted into the pole hole.

Preferably, the bottom of lamina tecti is provided with joint groove or joint piece, and the top of moulding the piece down is provided with joint piece or joint groove correspondingly, the middle part in joint groove has the bellying, joint piece and joint groove looks adaptation and chucking be in the joint inslot and will mould a fixed mounting on the lamina tecti down.

The invention also provides a manufacturing method of the power battery top cover, which is used for manufacturing the power battery top cover and comprises the following steps:

preparing a top cover plate, a fixing piece, a pole column piece, a sealing piece and a lower plastic piece, and fixing the fixing piece on the top cover plate in a laser welding mode;

secondly, the sealing element and the pole piece are sequentially arranged in the fixing piece through the first through hole of the fixing piece;

rotating the pole column piece to enable a limiting boss on the pole column piece to be aligned with a limiting flange on the fixing piece, and obtaining a pre-assembly body;

step four, forming an upper plastic part which is wrapped in the fixing part and fills the gap between the fixing part and the pole part on the preassembly body in an injection molding mode;

and step five, assembling the lower plastic part to the bottom of the top cover plate.

Preferably, the pole piece is made of a copper-aluminum composite plate in a stamping mode.

The invention has the beneficial effects that: in the power battery top cover, the sealing ring can separate the pole column piece from the top cover plate, the upper plastic piece can separate the pole column piece from the fixing piece, so that the pole column piece can be insulated from the top cover plate and the fixing piece, electric leakage is avoided, the limiting flange of the fixing piece can block the limiting boss of the pole column piece and can clamp the part, located between the limiting flange and the limiting boss, of the upper plastic piece together with the limiting flange of the pole column piece, loosening of the pole column piece and the upper plastic piece can be effectively prevented, structural firmness of the power battery top cover is effectively improved, the power battery top cover is simple in structure, few in parts, convenient to manufacture, produce and assemble and beneficial to improvement of production efficiency; according to the assembling method of the power battery, the method of firstly laser welding the fixing piece and then injection molding is adopted for assembling, the requirement on the length of the pole column piece is reduced, the product quality and the quality product rate can be effectively improved, the occupation of the internal space of the battery can be reduced, the battery capacity and the battery capacity density can be improved, the laser welding and the injection molding are mature processing technologies, the equipment cost is low, the quality product rate can be effectively improved, the production cost can be reduced, in addition, the assembling process is simple, the production efficiency can be effectively improved, the popularization and the application are convenient, and the market competitiveness of enterprises can be improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is an overall block diagram of a preferred embodiment of the top cover of the power cell of the present invention;

FIG. 2 is an exploded view of a preferred embodiment of the top cover of the power cell of the present invention;

FIG. 3 is an exploded view of another perspective of the preferred embodiment of the top cover of the power cell of the present invention;

fig. 4 is a partially enlarged view of a portion a in fig. 3.

Detailed Description

Referring to fig. 1 to 4, in a preferred embodiment of a top cover for a power battery according to the present invention, the top cover for a power battery includes: the top cover plate 10 is provided with a pole column hole 11; a fixing member 20 fixed on the top cover plate 10 and surrounding the pole hole 11, the fixing member 20 having a lateral position-limiting flange 21 located at a distance above the top cover plate 10 and extending inward, the top end of the fixing member 20 having a first through hole 22; the pole post piece 30 is positioned in the fixing piece 20 and vertically aligned with the pole post hole 11, a lateral limiting boss 31 matched with the limiting flange 21 is arranged on the pole post piece 30, and the limiting boss 31 is vertically aligned with the limiting flange 21; when the pole piece 30 rotates relative to the fixing piece 20 until the boss is staggered with the flange, the first through hole 22 can allow the pole piece 30 to pass through; the inner wall of the fixed part 20 is spaced from the outer wall of the pole piece 30 by a distance; an insulating seal ring 40, interposed between the post 30 and the top cover plate 10 and aligned with the post hole 11, for spacing the seal from the top cover plate 10; the first through hole 22 is for the seal to pass through; an insulating upper molding member 50 wrapping the fixing member 20 and filling a gap between the post member 30 and the fixing member 20 to separate the fixing member 20 and the post member 30; the top of the upper molding member 50 has a second through hole 51 aligned with the pole member 30. In the top cover of the power battery, the sealing ring 40 can separate the pole piece 30 from the top cover plate 10, the upper plastic piece 50 can separate the pole piece 30 from the fixing piece 20, so that the pole piece 30 can be insulated from the top cover plate 10 and the fixing piece 20, electric leakage is avoided, the limiting flange 21 of the fixing piece 20 can block the limiting boss 31 of the pole piece 30 and can clamp the part, located between the limiting flange 21 and the limiting boss 31, of the upper plastic piece 50 together with the limiting flange 21 of the pole piece 30, the pole piece 30 and the upper plastic piece 50 can be effectively prevented from loosening, structural firmness of the top cover of the power battery is effectively improved, and in addition, the top cover of the power battery is simple in structure, few in parts, convenient to manufacture, produce and assemble and beneficial to improvement of production efficiency.

As a preferred embodiment of the present invention, it may also have the following additional technical features:

in this embodiment, the number of the limiting flanges 21 and the limiting bosses 31 is four and is uniformly distributed around the fixing member 20 and the pole piece 30, the shape is regular, the processing and the manufacturing are convenient, the stress uniformity of the pole piece 30 can be improved, and in practical application, the number and the distribution mode of the limiting flanges 21 and the limiting bosses 31 can be flexibly adjusted according to needs, and are not limited to this.

In this embodiment, the pole piece 30, the fixing piece 20 and the top cover plate 10 are made of metal, so that the structural strength of the top cover of the power battery can be improved, and the sealing ring 40 can be made of common insulating materials such as plastics and rubber. In practical application, the materials of all the parts can be flexibly adjusted according to the requirements.

In addition, in the present embodiment, the number of the pole members 30 is two, and the pole holes 11, the fixing member 20, the sealing ring 40, and the above members are respectively used as the positive electrode and the negative electrode of the battery, and the number of the pole members 30 is adapted to the number of the pole members. In practical application, the number of the pole pieces 30 can be adjusted according to different types and structures of the batteries.

In this embodiment, the upper portion of the post member 30 passes through the second through hole 51 and extends to the upper portion of the upper plastic member 50, so that the post member 30 can be conveniently connected with an external electric device, and the use is convenient.

Thereby on mould 50 through the mode shaping of moulding plastics on mounting 20 parcel mounting 20 and fill the clearance between utmost point post 30 and the mounting 20, at injection moulding's in-process, the material of moulding plastics can flow between mounting 20 and utmost point post 30, the material of moulding plastics can cooling forming after the completion of moulding plastics, the requirement to utmost point post 30 length has been reduced, product quality and excellent quality rate can be effectively improved, also can reduce the occupation to battery inner space, help promoting battery capacity and battery capacity density. In practical applications, the upper plastic part 50 may also be assembled by extrusion after being molded, or molded on the fixing part 20 by using other common processes, such as hot melting, glue injection, etc., without being limited thereto.

The fixing piece 20 is fixed on the top cover plate 10 in a laser welding mode, so that the flatness of the joint of the fixing piece 20 and the top cover plate 10 can be effectively kept, the generation of welding slag, impurities and the like is reduced, and the product quality can be effectively guaranteed.

The injection molding process and the laser welding process are widely applied in the field, and are not detailed in detail, and both are mature technologies, so that the product quality can be effectively guaranteed, and the high-quality product rate can be improved.

The top of lamina tecti 10 is provided with the constant head tank 12 with the bottom looks adaptation of mounting 20, and the bottom of mounting 20 is inserted and is established in constant head tank 12, can fix a position mounting 20, and convenient assembly to can improve the firmness that lamina tecti 10 and mounting 20 are connected, prevent that mounting 20 from receiving too big yawing force and producing the skew and drop, can effectively improve product quality.

The top of lamina tecti 10 is provided with around the first boss 13 outside the utmost point post hole 11, and the hole of sealing washer 40 is established outside first boss 13 with first boss 13 looks adaptation and cover, can fix a position sealing washer 40, convenient assembly to can prevent effectively that sealing washer 40 skew from misplacing, can guarantee product quality.

Mould a 50 once installed to the bottom of lamina tecti 10, mould a 50 and have the third through-hole that aligns with utmost point post hole 11 and encircle the second boss 62 outside the third through-hole on the piece 50 down, second boss 62 and utmost point post hole 11 looks adaptation and insert and establish in utmost point post hole 11, the bottom surface of top cap is usually with the inner core of battery, contact such as solution, should mould a 50 and can avoid lamina tecti 10 to receive the corruption and the electric leakage condition appears down, help prolonging the life of product, the security performance is improved, second boss 62 and utmost point post hole 11's cooperation, can mould a 50 to fix a position down, the accuracy of assembly is improved, product quality can be effectively guaranteed.

The bottom of lamina tecti 10 is provided with joint groove 71, the corresponding joint piece 72 that is provided with in top of lower plastic part 50, the middle part in joint groove 71 has bellying 73, joint piece 72 and joint groove 71 looks adaptation and chucking are in joint groove 71 and will mould a 50 fixed mounting on lamina tecti 10 down, and the side of joint piece 72 is provided with corresponding recess, from this can be with moulding down that 50 are firm to be fixed on lamina tecti 10, convenient processing and assembly, in the assembling process, can extrude joint piece 72 into in the joint groove 71, means such as heating can be utilized to assist simultaneously, improve the firmness of connecting. In practical application, the positions of the clamping grooves 71 and the clamping blocks 72 can be interchanged, and in addition, in the embodiment, the clamping grooves 71 are dispersedly distributed at each position of the top cover plate 10, so that the firmness of the connection between the top cover plate 10 and the lower plastic part 50 can be improved, and the firmness of the connection between the top cover plate 10 and the lower plastic part 50 can also be improved

The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.

The invention also provides a manufacturing method of the power battery top cover, which is used for manufacturing the power battery top cover and comprises the following steps:

step one, preparing a top cover plate 10, a fixing piece 20, a pole piece 30, a sealing piece and a lower plastic piece 50, and fixing the fixing piece 20 on the top cover plate 10 in a laser welding mode; the fixed part 20 and the top cover plate 10 can be manufactured by processes such as stamping, machining and the like, so that the processing is convenient, and the lower plastic part 50 can be manufactured by common processes such as injection molding and the like;

step two, the sealing element and the pole piece 30 are sequentially arranged in the fixing piece 20 through the first through hole 22 of the fixing piece 20;

rotating the pole column piece 30 to enable the limiting boss 31 on the pole column piece 30 to be aligned with the limiting flange 21 on the fixing piece 20, and obtaining a pre-assembly body;

step four, forming an upper plastic part 50 which is wrapped in the fixing part 20 and fills the gap between the fixing part 20 and the pole part 30 on the pre-assembly body in an injection molding mode;

and step five, assembling the lower molding member 50 to the bottom of the top cover plate 10.

According to the assembling method of the power battery, the method that the fixing part 20 is welded by laser firstly and then injection molding is carried out is adopted for assembling, the requirement on the length of the pole column part 30 is reduced, the product quality and the quality product rate can be effectively improved, the occupation of the internal space of the battery can be reduced, the battery capacity and the battery capacity density can be improved, the laser welding and the injection molding are mature processing technologies, the equipment cost is low, the quality product rate can be effectively improved, the production cost is reduced, in addition, the assembling process is simple, the production efficiency can be effectively improved, the popularization and the application are convenient, and the market competitiveness of enterprises can be improved.

In the preferred embodiment, the pole piece 30 is made of a copper-aluminum composite plate by stamping, so that the efficiency is high, the manufacturing cost can be effectively reduced, and in practical application, the pole piece 30 can also be manufactured by machining methods such as cutting and polishing, and the manufacturing cost can also be reduced.

The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by basically the same means are all within the protection scope of the present invention.