阅读说明：本技术 铜铝复合的极柱、负极盖板组件结构及储能单元 (Copper-aluminum composite pole, cathode cover plate assembly structure and energy storage unit ) 是由 孙伟 王俊华 于 2021-03-05 设计创作，主要内容包括：本发明公开了一种铜铝复合的极柱、负极盖板组件结构及储能单元,极柱的上部为铝材部,下部为铜材部,铝材部与铜材部的连接部位为熔合的过渡部,所述铝材部与过渡部在装配以后不与电解液接触。本发明的负极柱组件的极柱采用铜铝过渡件,极柱上部的铝材部采用铝材,焊接性能好,更利于与模组的单体间使用铝片进行焊接,极柱下部的铜材部采用铜材,与储能元件内部的电解液接触进行导电,导电性能好,且不会发生电化学腐蚀。(The invention discloses a copper-aluminum composite pole, a negative electrode cover plate assembly structure and an energy storage unit. The pole of the negative pole component adopts the copper-aluminum transition component, the aluminum material part at the upper part of the pole adopts the aluminum material, the welding performance is good, the welding with the monomer of the module is more facilitated by using the aluminum sheet, the copper material part at the lower part of the pole adopts the copper material, the copper material part is contacted with the electrolyte in the energy storage element for conducting electricity, the conductivity is good, and the electrochemical corrosion can not occur.)

1. A copper-aluminum composite pole is characterized in that: the upper portion of utmost point post (411) is aluminium material portion (4111), and the lower part is copper material portion (4113), and the connection site of aluminium material portion (4111) and copper material portion (4113) is transition portion (4112) of fusing, aluminium material portion (4111) and transition portion (4112) do not contact with electrolyte after the assembly.

2. A negative electrode cover plate assembly structure using the copper-aluminum composite pole as claimed in claim 1, characterized in that: the first cover plate (42) is sleeved on the periphery of a pole column (411) of the negative pole column assembly (41), an insulating part is arranged between the first cover plate (42) and the pole column (411), and the insulating part is arranged on the periphery of an aluminum material portion (4111) and a transition portion (4112) of the pole column (411).

3. The negative electrode cover plate assembly structure of claim 2, wherein: the insulating parts are a first insulating part (43) and a second insulating part (44); the first insulating piece (43) is sleeved on the periphery of an aluminum material portion (4111) of the pole column (411), and the second insulating piece (44) is sleeved on the periphery of a transition portion (4112) of the pole column (411).

4. The negative electrode cover plate assembly structure of claim 2, wherein: a chassis (412) is fixed on the copper part (4113) of the pole column (411), and the chassis (412) is a copper disc; the chassis (412) is provided with a plurality of through holes (4122).

5. The negative electrode cover plate assembly structure of claim 2, wherein: the first cover plate (42) is provided with a liquid injection port (424); a circumferential limiting structure is arranged between the first cover plate (42) and the first insulating part (43), and a radial and axial limiting structure is arranged between the pole (411) of the negative pole component (41) and the first insulating part (43).

6. The negative electrode cover plate assembly structure of claim 2, wherein: a third center hole (421) is formed in the center of the first cover plate (42), a counter bore is formed in the upper end of the third center hole (421) to form a first step surface (422), and a plurality of grooves (423) are formed in the first step surface (422); a second boss (431) and a third boss (432) are sequentially arranged at the lower part of the first insulating piece (43), a second step surface (435) is arranged between the second boss (431) and the third boss (432), and a plurality of convex blocks (433) are arranged on the second step surface (435); the plurality of lugs (433) of the first insulating piece (43) are matched with the plurality of grooves (423) of the first cover plate (42) to form the circumferential limiting structure; the second step surface (435) of the first insulating piece (43) is attached to the first step surface (422) of the first cover plate (42).

7. The negative electrode cover plate assembly structure of claim 6, wherein: an annular groove (4114) is formed in the circumferential surface of the aluminum material portion (4111) of the pole column (411), and a convex ring (434) protrudes from the inner wall surface of a central through hole of the first insulating piece (43); the convex ring (434) of the first insulating piece (43) is embedded into the annular groove (4114) of the pole column (411) to form the radial and axial limiting structure.

8. An energy storage element, characterized by: by adopting the negative cover plate assembly structure of any one of claims 2 to 7, a battery core (2) is inserted into the casing (1), the top end of the battery core (2) is fixedly connected with the negative cover plate assembly (4) through the negative current collecting disc (3), and the bottom end of the battery core (2) is fixedly connected with the positive cover plate assembly (6) through the positive current collecting disc (5); the negative current collecting plate (3) is made of copper, and the positive current collecting plate (5) is made of aluminum.

9. An energy storage element as claimed in claim 8, wherein: the bottom of the shell (1) is provided with a bottom surface (11), and the center of the bottom surface (11) is provided with a first central hole (12); a fourth boss (612) and a fifth boss (613) are arranged on the bottom surface of a second cover plate (61) of the positive cover plate assembly (6), the outer diameter of the fourth boss (612) is larger than the aperture of a first central hole (12) of the bottom surface (11) of the shell (1), the outer diameter of the fifth boss (613) is matched with the aperture of the first central hole (12), the fifth boss (613) penetrates out of the first central hole (12), and the outer peripheral surface of the fifth boss (613) is fixed with the inner peripheral surface of the first central hole (12) by welding; the center of the second cover plate (61) is provided with a through stepped hole (611), a rubber plug (62) and an aluminum plug (63) are sequentially arranged in the stepped hole (611) from inside to outside, and the aluminum plug (63) is fixed on the second cover plate (61).

10. An energy storage element as claimed in claim 8, wherein: the energy storage element is a super capacitor or a battery.

Technical Field

The invention relates to the technical field of electrical energy storage, in particular to a negative electrode cover plate assembly structure and an energy storage element.

Background

The negative pole post part of energy storage components such as battery, super capacitor avoids taking place electrochemical reaction with inside electrolyte, adopts the full copper spare usually, but the price of full copper spare is more expensive on the one hand, and spare part cost is higher, and on the other hand the welding performance between full copper spare negative pole post and the outside aluminium system connection piece is relatively poor, and copper aluminium junction can produce the galvanic corrosion phenomenon under the circular telegram condition. The negative electrode part contacting the electrolyte can not be aluminum but must be copper, and the copper-aluminum transition material can solve the problem.

The insulating part between the negative pole post of energy storage element's negative pole apron subassembly and the first apron at present adopts the insulating part riveting to form usually, does not have circumference spacing between insulating part and the first apron, probably can produce the rotation in a circumferential direction in the production and processing process to influence product quality. The cylinder body is generally a straight-through cylinder tube structure with two completely open and through ports, a circular cover plate matched with the outline of the port of the positive electrode is adopted at the positive electrode end to seal and cover the whole port, the butt joint edges of the port and the positive electrode are welded and fixed, the edge parts of the port and the positive electrode are usually welded after oblique line butt joint, and the butt joint control difficulty of the port and the positive electrode is relatively high in the welding process, so that the welding reliability is influenced due to the fact that displacement is easy to occur without paying attention; and the mode of edge butt joint is all higher to the dimensional accuracy requirement of barrel and apron, and the processing technology degree of difficulty is great.

Disclosure of Invention

The applicant provides a negative pole cover plate assembly structure and an energy storage element with reasonable structure aiming at the defects of the existing energy storage element, and the negative pole column adopts a copper-aluminum transition piece, so that the conductivity weldability is better, and the part cost is low. Set up limit structure between insulating part and first apron, prevent that the insulating part is rotatory, the insulating part adopts the mode of moulding plastics simultaneously, guarantees sealing performance and insulating properties uniformity, trompil on integrated into one piece's the bottom plate on the barrel, and the boss of second apron is worn out from the trompil, and at the global welded fastening of cylinder of the two, improve welding reliability, reduce the requirement to size precision, reduce the processing technology degree of difficulty.

The technical scheme adopted by the invention is as follows:

the utility model provides a copper aluminium complex utmost point post, the upper portion of utmost point post is aluminum product portion, and the lower part is copper product portion, and the transition portion that the connection position of aluminum product portion and copper product portion is for fusing, aluminum product portion and transition portion do not contact with electrolyte after the assembly.

The pole of the negative pole component adopts the copper-aluminum transition component, the aluminum material part at the upper part of the pole adopts the aluminum material, the welding performance is good, the welding with the monomer of the module is facilitated by using the aluminum sheet, the copper material part at the lower part of the pole adopts the copper material, the copper material part is contacted with the electrolyte in the energy storage element for conducting electricity, the conductivity is good, and the electrochemical corrosion can not occur; and the post adopts the copper aluminium transition piece, and the position that contacts with electrolyte is the copper product, and other positions are the aluminum product that the price is lower, when guaranteeing to have fine electric conductivity, and the copper aluminium transition piece is lower for its price of full copper spare, more does benefit to the cost that reduces spare part, is favorable to electrically conductive natural transition.

The utility model provides an use above-mentioned copper aluminium complex utmost point post's negative pole apron subassembly structure, first apron cover is established in the utmost point post periphery of negative pole post subassembly, is provided with the insulating part between first apron and the utmost point post, and the insulating part setting is in the aluminium material portion and the transition portion periphery of utmost point post.

As a further improvement of the above technical solution:

the insulating parts are a first insulating part and a second insulating part; the first insulating part is sleeved on the periphery of the aluminum part of the pole, and the second insulating part is sleeved on the periphery of the transition part of the pole.

The first insulating part and the second insulating part also serve as sealing elements to seal the aluminum part and the transition part of the pole, so that the aluminum-containing aluminum part and the transition part are prevented from being corroded due to contact with electrolyte in the energy storage element, and the conductivity of the pole is ensured.

A chassis is fixed on the copper part of the pole and is a copper disc; the chassis is provided with a plurality of through holes.

The first cover plate is provided with a liquid injection port; a circumferential limiting structure is arranged between the first cover plate and the first insulating part, and a radial and axial limiting structure is arranged between the pole of the negative pole column assembly and the first insulating part.

According to the invention, the plurality of lugs of the first insulating part are matched with the plurality of grooves of the first cover plate to form a circumferential limiting structure, so that the first insulating part is prevented from rotating, and the second insulating part ensures the insulating property by using an injection molding process.

A third central hole is formed in the center of the first cover plate, a counter bore is formed in the upper end of the third central hole to form a first step surface, and a plurality of grooves are formed in the first step surface; a second boss and a third boss are sequentially arranged at the lower part of the first insulating part, a second step surface is arranged between the second boss and the third boss, and a plurality of lugs are arranged on the second step surface; the plurality of lugs of the first insulating part are matched with the plurality of grooves of the first cover plate to form the circumferential limiting structure; the second step surface of the first insulating part is attached to the first step surface of the first cover plate.

A ring groove is formed in the circumferential surface of the aluminum part of the pole, and a convex ring is protruded on the inner wall surface of the central through hole of the first insulating piece; the convex ring of the first insulating part is embedded into the annular groove of the pole to form the radial and axial limiting structure.

An energy storage element adopts the structure of the negative cover plate component, an electric core is inserted in a shell, the top end of the electric core is fixedly connected with the negative cover plate component through a negative current collecting plate, and the bottom end of the electric core is fixedly connected with the positive cover plate component through a positive current collecting plate; the negative current collecting plate is made of copper, and the positive current collecting plate is made of aluminum.

As a further improvement of the above technical solution:

the bottom of the shell is provided with a bottom surface, and the center of the bottom surface is provided with a first central hole; a fourth boss and a fifth boss are arranged on the bottom surface of a second cover plate of the positive cover plate assembly, the outer diameter of the fourth boss is larger than the aperture of the first center hole in the bottom surface of the shell, the outer diameter of the fifth boss is matched with the aperture of the first center hole, the fifth boss penetrates out of the first center hole, and the outer peripheral surface of the fifth boss and the inner peripheral surface of the first center hole are fixed through welding; the center of the second cover plate is provided with a through step hole, a rubber plug and an aluminum plug are sequentially arranged in the step hole from inside to outside, and the aluminum plug is fixed on the second cover plate.

When the welding device is assembled, the fifth boss of the second cover plate penetrates out of the first center hole of the shell to realize the matching of the corresponding surfaces, when in welding, the matching part can be well welded without additional control, the welding difficulty is reduced, the matching speed of the fifth boss and the fifth boss is a cylindrical peripheral surface, the matching area is large, the welding is firmer, and the welding reliability is improved; moreover, the matching parts of the shell and the second cover plate are the inner peripheral surface of the first center hole and the outer peripheral surface of the fifth boss, so that the dimensional accuracy of the two matching surfaces is mainly ensured during processing, the dimensional accuracy requirements on other parts are reduced, and the processing technology difficulty is reduced.

The energy storage element is a super capacitor or a battery.

The invention has the following beneficial effects:

the pole of the negative pole component adopts the copper-aluminum transition component, the aluminum material part at the upper part of the pole adopts the aluminum material, the welding performance is good, the welding with the monomer of the module is facilitated by using the aluminum sheet, the copper material part at the lower part of the pole adopts the copper material, the copper material part is contacted with the electrolyte in the energy storage element for conducting electricity, the conductivity is good, and the electrochemical corrosion can not occur; and the post adopts the copper aluminium transition piece, and the position that contacts with electrolyte is the copper product, and other positions are the aluminum product that the price is lower, when guaranteeing to have fine electric conductivity, and the copper aluminium transition piece is lower for its price of full copper spare, more does benefit to the cost that reduces spare part, is favorable to electrically conductive natural transition.

The first insulating part and the second insulating part also serve as sealing elements to seal the aluminum part and the transition part of the pole, so that the aluminum-containing aluminum part and the transition part are prevented from being corroded due to contact with electrolyte in the energy storage element, and the conductivity of the pole is ensured.

According to the invention, the plurality of lugs of the first insulating part are matched with the plurality of grooves of the first cover plate to form a circumferential limiting structure, so that the first insulating part is prevented from rotating, and the second insulating part ensures the insulating property by using an injection molding process.

When the welding device is assembled, the fifth boss of the second cover plate penetrates out of the first center hole of the shell to realize the matching of the corresponding surfaces, when in welding, the matching part can be well welded without additional control, the welding difficulty is reduced, the matching speed of the fifth boss and the fifth boss is a cylindrical peripheral surface, the matching area is large, the welding is firmer, and the welding reliability is improved; moreover, the matching parts of the shell and the second cover plate are the inner peripheral surface of the first center hole and the outer peripheral surface of the fifth boss, so that the dimensional accuracy of the two matching surfaces is mainly ensured during processing, the dimensional accuracy requirements on other parts are reduced, and the processing technology difficulty is reduced.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a longitudinal sectional view of fig. 1.

Fig. 3 is a longitudinal sectional view of the negative electrode cap plate assembly.

Fig. 4 is an exploded view of the negative electrode pillar assembly.

Fig. 5 is a perspective view of the first cover plate.

Fig. 6 is a perspective view of the first insulating member.

Fig. 7 is a perspective view of the second cover plate.

In the figure: 1. a housing; 11. a bottom surface; 12. a first central aperture; 2. an electric core; 3. a negative current collecting plate; 4. a negative electrode cover plate assembly; 41. a negative post assembly; 411. a pole column; 4111. an aluminum material portion; 4112. a transition section; 4113. a copper material portion; 4114. a ring groove; 4115. a first boss; 412. a chassis; 4121. a second central aperture; 4122. a through hole; 42. a first cover plate; 421. A third central aperture; 422. a first step surface; 423. a groove; 424. a liquid injection port; 43. a first insulating member; 431. a second boss; 432. a third boss; 433. a bump; 434. a convex ring; 435. a second step surface; 44. a second insulating member; 5. a positive current collector; 6. a positive cover plate assembly; 61. a second cover plate; 611. A stepped bore; 612. a fourth boss; 613. a fifth boss; 62. a rubber stopper; 63. and (4) an aluminum plug.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

The energy storage element is a super capacitor, or a battery, or other energy storage structures.

As shown in fig. 1 and 2, the housing 1 of the present invention is a cylindrical shape with a top fully opened and a bottom 11 at the bottom, and a first central hole 12 is opened at the center of the bottom 11. Electric core 2 is equipped with in the interpolation of casing 1, and 3 fixedly connected with negative pole apron subassembly 4 of negative pole current collector are passed through on the top of electric core 2, and the anodal apron subassembly 6 of 5 fixedly connected with of anodal current collector is passed through to the bottom of electric core 2, and negative pole current collector 3 is the copper product, and anodal current collector 5 is the aluminum product.

As shown in fig. 2 and 3, the negative electrode cover plate assembly 4 includes a negative electrode post assembly 41, a first cover plate 42, a first insulating member 43, and a second insulating member 44. As shown in fig. 4, the negative pole assembly 41 includes a pole 411 and a bottom plate 412; the chassis 412 is a circular copper disc, a second central hole 4121 is formed in the center of the chassis 412, and a plurality of through holes 4122 are formed in the disc surface of the chassis 412 and located on the outer side of the second central hole 4121; the pole 411 is a copper-aluminum transition piece which is formed by extruding and melting an aluminum material and a copper material into a whole, the upper part of the pole is a cylindrical aluminum material part 4111, the lower part of the pole is a disc-shaped copper material part 4113, and the connecting part of the aluminum material part 4111 and the copper material part 4113 is a naturally-transitional transition part 4112 formed by fusion in the extruding process; a ring groove 4114 is formed in the circumferential surface of the aluminum material portion 4111, a first boss 4115 is arranged at the bottom of the copper material portion 4113, the outer diameter of the first boss 4115 is slightly larger than the inner diameter of a second central hole 4121 of the base plate 412, as shown in fig. 3, the first boss 4115 is pressed in the second central hole 4121, and the two are in interference fit, so that the pole 411 and the base plate 412 are fixedly connected, as shown in fig. 2, the base plate 412 is fixed to the negative current collecting plate 3 by welding; the pole 411 of the negative pole column component 41 adopts a copper-aluminum transition piece, the aluminum material portion 4111 on the upper portion of the pole 411 adopts an aluminum material, the welding performance is good, the welding with an aluminum sheet of a module is facilitated, the copper material portion 4113 on the lower portion of the pole 411 adopts a copper material, the copper material portion is in contact with an electrolyte in an energy storage element to conduct electricity, the electric conductivity is good, and electrochemical corrosion cannot occur; and utmost point post 411 adopts the copper aluminium transition piece, and the position that contacts with electrolyte is the copper product, and other positions are the aluminum product of lower price, when guaranteeing to have fine electric conductivity, and the copper aluminium transition piece is lower for its price of full copper spare, more does benefit to the cost that reduces spare part. As shown in fig. 3, the first cover plate 42 is sleeved on the periphery of the pole 411 of the negative pole column assembly 41, the first insulating member 43 is sequentially arranged between the first cover plate 42 and the pole 411 from top to bottom, the second insulating member 44 is insulated, the corresponding surfaces of the first insulating member 43 and the second insulating member 44 are abutted against each other, the first insulating member 43 is sleeved on the periphery of the aluminum portion 4111 of the pole 411, the second insulating member 44 is sleeved on the periphery of the transition portion 4112 of the pole 411, the first insulating member 43 and the second insulating member 44 further serve as sealing members to seal the aluminum portion 4111 and the transition portion 4112 of the pole 411, so as to prevent the aluminum-containing aluminum portion 4111 and the transition portion 4112 from contacting with the electrolyte inside the energy storage element to generate electrochemical corrosion, and ensure the conductivity of the pole 411. As shown in fig. 5, a third center hole 421 is formed in the center of the first cover plate 42, and a liquid injection port 424 is formed in the plate surface of the first cover plate 42 and located outside the third center hole 421, and is used for filling a negative electrolyte into a cavity between the casing 1 and the battery core 2; the upper end of the third center hole 421 is provided with a counter bore to form a first step surface 422, and the first step surface 422 is uniformly provided with a plurality of grooves 423 along the circumferential direction. As shown in fig. 6, a second boss 431 and a third boss 432 are sequentially provided at a lower portion of the first insulating member 43, an outer diameter of the second boss 431 is larger than an outer diameter of the third boss 432, a second step surface 435 is provided therebetween, and a convex ring 434 protrudes from an inner wall surface of a central through hole of the first insulating member 43. As shown in fig. 3, the first insulating member 43 is formed on the first cover plate 42 by injection molding, during the molding process, the injected glue flows into the plurality of grooves 423 of the first cover plate 42, and is solidified on the second step surface 435 after cooling to form a plurality of protrusions 433, the plurality of protrusions 433 and the plurality of grooves 423 cooperate to form a circumferential limiting structure, so as to prevent the first insulating member 43 from rotating, ensure the insulating performance, and the second step surface 435 of the first insulating member 43 is tightly attached to the first step surface 422 of the first cover plate 42; the third boss 432 of the first insulating member 43 is inserted into the gap between the third center hole 421 of the first cover plate 42 and the pole 411 of the negative pole column assembly 41, and the boss ring 434 of the first insulating member 43 is inserted into the annular groove 4114 of the pole 411 to form a radial and axial limiting structure, so as to perform radial and axial limiting.

As shown in fig. 7, the second cover plate 61 of the positive cover plate assembly 6 is a circular aluminum disc, and a through stepped hole 611 is formed in the center of the second cover plate 61, and is used for filling a cavity in the center of the electric core 2 with positive electrolyte; the rubber plug 62 and the aluminum plug 63 are sequentially arranged in the stepped hole 611 from inside to outside for sealing, and the aluminum plug 63 is fixed on the second cover plate 61 through welding. The center of the bottom surface of the second cover plate 61 is overlapped and extended with a plurality of bosses outwards in sequence, the outer diameters of the bosses from inside to outside are reduced in sequence, the innermost layer is a fourth boss 612, the fifth boss 613 is arranged next to the fourth boss 612, as shown in fig. 2, the outer diameter of the fourth boss 612 is larger than the diameter of the first center hole 12 of the bottom surface 11 of the housing 1, the outer diameter of the fifth boss 613 matches the diameter of the first center hole 12, the fifth boss 613 protrudes from the first center hole 12, the outer peripheral surface of the fifth boss 613 is fixed to the inner peripheral surface of the first center hole 12 by welding, and when the fifth boss 613 is assembled, the fifth boss 613 penetrates through the first center hole 12 to realize the matching of the corresponding surfaces, during welding, the welding can be well carried out without additional control on the matching part, the welding difficulty is reduced, the matching surface of the two parts is a cylindrical peripheral surface, the matching area is large, the welding is firmer, and the welding reliability is improved; moreover, since the fitting portions of the housing 1 and the second cover plate 61 are the inner circumferential surface of the first central hole 12 and the outer circumferential surface of the fifth boss 613, the dimensional accuracy of the two fitting circumferential surfaces is mainly ensured during processing, and the requirement on the dimensional accuracy of other portions is reduced, thereby reducing the difficulty of the processing process.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.