CN220456601U

CN220456601U - Energy storage battery

Info

Publication number: CN220456601U
Application number: CN202321780151.4U
Authority: CN
Inventors: 周富华; 刘淼; 付阳锋
Original assignee: Hunan Times United New Energy Co ltd
Current assignee: Hunan Times United New Energy Co ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-02-06
Anticipated expiration: 2033-07-07

Abstract

The utility model relates to the technical field of batteries and discloses an energy storage battery which comprises a shell, a battery core, an anode current collector, an anode assembly, a cathode current collector and a cathode assembly, wherein the shell is arranged on the shell; the battery cell is positioned in the shell; the positive pole spring plate is bent from one end of the positive pole plate to the surface of the positive pole plate, and the positive pole plate is welded to the positive pole of the battery cell; the positive end cover is provided with a positive hole, the positive column penetrates through the positive hole, the first sealing piece seals the positive hole, the first insulating ring is enclosed outside the positive column, the first insulating ring is respectively connected with the shell and the positive end cover, and the positive elastic sheet is welded on the positive column; the negative electrode spring plate is bent from one end of the negative electrode plate to the plate surface of the negative electrode plate, and the negative electrode plate is welded on the negative electrode of the battery cell; the negative electrode end cover is provided with a negative electrode hole, the negative electrode column penetrates through the negative electrode hole, the second sealing piece seals the negative electrode hole, the second insulating ring is enclosed outside the negative electrode column and is respectively connected with the shell and the negative electrode end cover, the negative electrode elastic sheet is welded to the negative electrode column, and thus the electric performance is enhanced.

Description

Energy storage battery

Technical Field

The utility model relates to the technical field of batteries, in particular to an energy storage battery.

Background

In the large-scale development stage of new energy industry, the energy storage industry enters the transition stage from the early industrialization stage to the large-scale development stage, the energy storage scale is rapidly increased, the energy storage project is widely applied, the technical level is rapidly improved, the standard system is gradually improved, the large cylindrical battery provides a battery solution with lower cost and better performance for the energy storage product, however, the existing large cylindrical battery still has some problems, for example, a connecting piece for connecting an anode post and a cathode post with an electric core is generally electrically connected with the post in an abutting mode, so that the contact area between the connecting piece and the post is smaller, the resistance is larger, and the discharge performance is poor.

Disclosure of Invention

The utility model aims to solve the technical problems that: the connection piece between the positive electrode post and the battery core influences the overall electrical performance of the battery.

In order to solve the technical problems, the utility model provides an energy storage battery which comprises a shell, a battery core, an anode current collector, an anode assembly, a cathode current collector and a cathode assembly; the battery cell is positioned in the shell; the positive current collector comprises a positive plate and a positive elastic piece, the positive elastic piece is bent from one end of the positive plate to the plate surface of the positive plate, and the positive plate is welded to the positive electrode of the battery cell; the positive electrode assembly comprises a positive electrode end cover, a positive electrode column, a first sealing piece and a first insulating ring, wherein the positive electrode end cover is provided with a positive electrode hole, the positive electrode column penetrates through the positive electrode hole, the first sealing piece is positioned between the positive electrode end cover and the positive electrode column and seals the positive electrode hole, the first insulating ring is enclosed outside the positive electrode column, the positive electrode end cover is connected with the first insulating ring, the first insulating ring is connected with the shell, and the positive electrode elastic sheet is welded to the positive electrode column; the negative electrode current collector comprises a negative electrode plate and a negative electrode elastic piece, the negative electrode elastic piece is bent from one end of the negative electrode plate to the plate surface of the negative electrode plate, and the negative electrode plate is welded to the negative electrode of the battery cell; the negative electrode assembly comprises a negative electrode end cover, a negative electrode column, a second sealing piece and a second insulating ring, wherein the negative electrode end cover is provided with a negative electrode hole, the negative electrode column penetrates through the negative electrode hole, the second sealing piece is positioned between the negative electrode end cover and the negative electrode column and seals the negative electrode hole, the second insulating ring is enclosed outside the negative electrode column, the negative electrode end cover is connected with the second insulating ring, the second insulating ring is connected with the shell, and the negative electrode elastic sheet is welded to the negative electrode column.

Further, the first sealing member comprises a first injection molding member, the first injection molding member is sleeved outside the positive pole, and the first injection molding member is clamped between the positive pole and the positive end cover.

Further, the positive pole is provided with a circle of first grooves, the first grooves encircle the central shaft of the positive pole, one face of the first injection molding piece, which faces the positive pole, is provided with a circle of first convex ribs, and the first convex ribs are embedded into the first grooves.

Further, one end of the positive pole is provided with a positive limiting ring, the diameter of the positive limiting ring is larger than the aperture of the positive pole hole, and the positive limiting ring is positioned on one side, close to the positive pole of the battery cell, of the positive pole hole.

Further, the first sealing piece further comprises a first sealing ring, the first sealing ring is sleeved outside the positive pole, and the first sealing ring is clamped between the first insulating ring and the positive limiting ring.

Further, a plurality of first protruding points are arranged on one surface of the first insulating ring, which faces the positive electrode end cover, a plurality of first pits are arranged on the positive electrode end cover corresponding to the first protruding points, and the first protruding points are embedded into the first pits.

Further, explosion-proof holes are formed in the positive end cover, explosion-proof valves are arranged on the first insulating ring, and the explosion-proof valves are opposite to the explosion-proof holes.

Further, the positive pole is provided with a liquid injection hole, and the liquid injection hole is communicated with the battery cell.

Further, the second sealing member comprises a second injection molding member, the second injection molding member is sleeved outside the negative pole, and the second injection molding member is clamped between the negative pole and the negative pole end cover.

Further, one end of the negative pole column is provided with a negative limiting ring, the diameter of the negative limiting ring is larger than the aperture of the negative pole hole, and the negative limiting ring is positioned on one side of the negative pole hole, which is close to the negative pole of the battery cell.

Compared with the prior art, the energy storage battery has the beneficial effects that: the positive current collector is welded with the positive electrode and the positive electrode post of the battery core respectively, the negative current collector is welded with the negative electrode and the negative electrode post of the battery core respectively, the contact area of the positive current collector and the positive electrode of the battery core is increased, the contact area of the negative current collector and the negative electrode of the battery core is also increased, the connection resistance is reduced, the bearing capacity of high current is high, the current density and the temperature field are uniform, the high-rate charge and discharge performance of the battery core is realized, in addition, the positive current collector and the positive electrode post are connected together in a flexible connection mode, the positive current collector is tightly pressed on the positive electrode post through elasticity, the positive current collector and the positive electrode post are tightly connected, the negative current collector and the negative electrode post are connected together in a flexible connection mode, the negative current collector is tightly pressed on the negative electrode post through elasticity, the negative current collector and the negative electrode post are tightly connected, and the structural stability, the consistency, the safety and the reliability of the energy storage battery are greatly improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a positive electrode assembly;

FIG. 3 is a cross-sectional view of the positive electrode assembly;

FIG. 4 is an exploded view of the positive electrode assembly;

FIG. 5 is an exploded view of the negative electrode assembly;

fig. 6 is an expanded view of the positive electrode current collector.

In the figure, a housing 001; a negative electrode assembly 002; a negative end cap 021; a second seal ring 022; a negative electrode column 023; a second injection molding 024; a second insulating ring 025; negative electrode current collector 003; a cell 004; a positive electrode current collector 005; a positive electrode assembly 006; positive end cap 061; explosion proof hole 062; a positive electrode post 063; a first injection molding 064; a first seal ring 065; an explosion-proof valve 066; a first insulating ring 067.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. in the present utility model are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 1, an energy storage battery according to a preferred embodiment of the present utility model includes a housing 001, a battery core 004, a positive current collector 005, a positive electrode assembly 006, a negative current collector 003 and a negative electrode assembly 002, wherein the positive electrode of the battery core 004 is electrically connected with the positive electrode assembly 006 through the positive current collector 005, and the negative electrode of the battery core 004 is electrically connected with the negative electrode assembly 002 through the negative current collector 003.

As shown in fig. 1, the battery cell 004 is located in the housing 001, the housing 001 is in a cylindrical tubular shape, the housing 001 can protect the battery cell 004, wherein the housing 001 is made of aluminum, and the housing 001 is insulated relatively from the battery cell 004. The battery cell 004 is wound into a bare battery cell 004 by adopting a diaphragm, a positive plate and a negative plate, and the positive electrode and the negative electrode of the battery cell 004 are shaped by adopting full lugs.

As shown in fig. 1 and fig. 6, the positive current collector 005 includes a positive plate and a positive plate spring, the positive plate is bent from one end of the positive plate to the surface of the positive plate, and the positive plate is welded to the positive electrode of the battery core 004, wherein the positive plate and the positive plate spring are integrally formed and made of metal, the positive current collector 005 has elasticity due to the metal material, and when pressure is applied to the positive plate spring, the positive plate spring can generate elasticity opposite to the positive plate.

As shown in fig. 3-4, the positive electrode assembly includes a positive electrode end cap 061, a positive electrode post 063, a first sealing member, and a first insulating ring 067, wherein the positive electrode end cap 061 is made of aluminum. The positive electrode end cap 061 is provided with a positive electrode hole, and the positive electrode hole is circular. The positive electrode end cap 061 covers the port of the housing 001 and is welded with the housing 001. The positive electrode post 063 passes through the positive electrode hole, wherein the positive electrode post 063 is not in direct contact with the positive electrode end cap 061. The positive pole 063 is made of copper-aluminum composite material. The first sealing member is located between the positive electrode end cap 061 and the positive electrode post 063, and seals the positive electrode hole, preventing the liquid from passing through the positive electrode hole to reach the inside of the case 001. The first seal separates the positive end cap 061 from the positive post 063, preventing the positive end cap 061 from directly conducting electricity with the positive post 063. The first insulating ring 067 is in an annular round cover shape, the first insulating ring 067 is surrounded outside the positive pole 063, and the first insulating ring 067 is in contact with the positive pole 063 but is not conductive. The end face of the positive electrode end cap 061 is connected with the end face of the first insulating ring 067, and the first insulating ring 067 is connected with the shell 001. The positive pole shell fragment welding in positive post 063, the electric current can follow the positive pole of electric core 004 flows in proper order the positive plate positive pole shell fragment positive post 063.

As shown in fig. 1 and fig. 5, the negative current collector 003 includes a negative plate and a negative plate spring, the negative plate is bent from one end of the negative plate to the plate surface of the negative plate, and the negative plate is welded to the negative electrode of the battery core 004, wherein the negative plate and the negative plate spring are integrally formed and made of metal, and the negative current collector 003 has elasticity due to the metal material, and when pressure is applied to the negative plate spring, the negative plate spring can generate an elasticity opposite to the negative plate.

As shown in fig. 1 and 5, the negative electrode assembly includes a negative electrode end cap 021, a negative electrode stem 023, a second seal, and a second insulating ring 025, and the negative electrode end cap 021 is made of aluminum. The negative electrode end cap 021 is provided with a negative electrode hole, and the negative electrode hole is round. The negative electrode end cover 021 covers the port of casing 001, and with casing 001 welds together, anodal end cover 061 with negative electrode end cover 021 is located respectively casing 001 relative both ends, anodal end cover 061, negative electrode end cover 021 all adopt the welding mode with casing 001, solve electric core 004 and adopt the sealed weeping problem of plastic part, guaranteed electric core 004 high uniformity simultaneously, carry out the module equipment for single electric core 004 and provide. The negative pole 023 passes through the negative pole aperture, wherein the negative pole 023 is not in direct contact with the negative end cap 021. The negative pole column 023 is made of copper-aluminum composite material. The second seal is located between the negative end cap 021 and the negative post 023, and seals the negative hole preventing liquid from passing through the negative hole to the inside of the case 001. The second seal separates the negative end cap 021 from the negative post 023, preventing the negative end cap 021 from directly conducting with the negative post 023.

As shown in fig. 4-5, the second insulating ring 025 is annular and dome-shaped, the second insulating ring 025 surrounds the cathode column 023, and the second insulating ring 025 contacts with the cathode column 023 but is not conductive. The negative electrode end cap 021 is connected with the second insulating ring 025, the second insulating ring 025 is connected with the shell 001, wherein the first insulating ring 067 and the first insulating ring 067 are respectively positioned at two opposite ends of the shell 001. The negative pole shell fragment weld in negative pole post 023, the electric current can follow positive pole post 063 flows in proper order negative pole shell fragment negative plate, the negative pole of electric core 004.

As shown in fig. 1-4, the first sealing member includes a first injection molding member 064, the first injection molding member 064 is sleeved outside the positive electrode post 063, the first injection molding member 064 is clamped between the positive electrode post 063 and the positive electrode end cap 061, the first injection molding member 064 is made of PP, an insulation resistance value is 10kΩ -100kΩ, the first injection molding member 064 is used for fixing a relative position between the positive electrode post 063 and the positive electrode end cap 061, and the first injection molding member 064 can prevent the positive electrode post 063 from being electrically connected with the positive electrode end cap 061, and the first injection molding member 064 can also prevent liquid from entering the housing 001 through the positive electrode hole. Specifically, the first injection molding part 064 is formed on the outer surface of the positive electrode post 063 by injection molding.

As shown in fig. 1-4, the positive electrode post 063 is provided with a circle of first grooves, the first grooves are ring-shaped, the first grooves encircle the central axis of the positive electrode post 063, one surface of the first injection molding piece 064, which faces the positive electrode post 063, is provided with a circle of first ribs, the first ribs are ring-shaped, and the first ribs are embedded into the first grooves. The first protruding rib is matched with the first groove, so that the positive pole 063 and the first injection molding piece 064 are fixed. One end of the positive pole 063 is provided with a positive limiting ring, the diameter of the positive limiting ring is larger than the diameter of the positive hole, the positive limiting ring is positioned on one side, close to the positive electrode of the battery core 004, of the positive hole, and the positive limiting ring can prevent the positive pole 063 from separating from the first insulating ring 067.

As shown in fig. 1-4, the first seal further comprises a first sealing ring 065, the first sealing ring 065 being made of an elastic insulating material, preferably the first sealing ring 065 is made of a peroxy ethylene propylene diene monomer. The first sealing ring 065 is sleeved outside the positive pole 063, and the first sealing ring 065 is clamped between the first insulating ring 067 and the positive limiting ring, so that liquid is prevented from entering the shell 001 through the positive hole, and the first sealing ring 065 is also in interference fit with the first injection molding piece 064, so that the sealing effect of the positive hole is further enhanced. The first insulating ring 067 is provided with a plurality of first salient points towards one surface of the positive electrode end cover 061, the positive electrode end cover 061 is provided with a plurality of first pits corresponding to the first salient points, the first salient points are embedded into the first pits, the first pits are embedded into the first salient points, the fixing effect of the first insulating ring 067 and the positive electrode end cover 061 is enhanced, and the first insulating ring 067 can be positioned through the first salient points to ensure that the first insulating ring 067 and the positive electrode end cover 061 are installed correctly. Explosion-proof hole 062 has been seted up to anodal end cover 061, first insulating circle 067 is equipped with explosion-proof valve 066, explosion-proof valve 066 just to explosion-proof hole 062, the gas that electricity core 004 produced can be through explosion-proof valve 066 row to explosion-proof hole 062, follow explosion-proof hole 062 again to energy storage battery, follow realization electricity core 004 safety protection performance. The positive pole 063 is provided with a liquid injection hole, the liquid injection hole is communicated with the battery core 004, and electrolyte can be injected into the battery core 004 through the liquid injection hole when the battery core 004 is manufactured.

As shown in fig. 1 and 5, the second sealing member includes a second injection molding member 024, the second injection molding member 024 is sleeved outside the negative electrode post 023, the second injection molding member 024 is clamped between the negative electrode post 023 and the negative electrode end cap 021, the second injection molding member 024 is made of PP, the insulation resistance is greater than 100gΩ, the second injection molding member 024 is used for fixing the relative position between the negative electrode post 023 and the negative electrode end cap 021, and the second injection molding member 024 can prevent the negative electrode post 023 and the negative electrode end cap 021 from being electrically connected, and the second injection molding member 024 can also prevent liquid from passing through the negative electrode hole and entering the housing 001. Specifically, the second injection molding 024 is formed on the outer surface of the negative electrode post 023 by injection molding. The negative pole post 023 is equipped with round second recess, the second recess is the ring form, the second recess encircles the center pin of negative pole post 023, second injection molding 024 orientation the one side of negative pole post 023 is equipped with round second fin, the second fin is the ring form, the second fin embedding the second recess. The second convex rib is matched with the second groove, so that the negative pole column 023 is fixed with the second injection molding 024.

As shown in fig. 1 and fig. 5, one end of the negative pole 023 is provided with a negative limit ring, the diameter of the negative limit ring is larger than the aperture of the negative pole hole, the negative limit ring is positioned on one side of the negative pole hole, which is close to the negative pole of the battery core 004, and the negative limit ring can prevent the negative pole 023 from separating from the second insulating ring 025. The second seal further comprises a second sealing ring 022, the second sealing ring 022 being made of an elastic insulating material, preferably the second sealing ring 022 being made of ethylene propylene diene monomer. The second sealing ring 022 is sleeved outside the negative pole column 023, and the second sealing ring 022 is clamped between the second insulating ring 025 and the negative limiting ring, so that liquid is prevented from penetrating through the negative pole hole to enter the shell 001, and the second sealing ring 022 is also in interference fit with the second injection molding 024, so that the sealing effect of the negative pole hole is further enhanced.

In summary, the embodiment of the utility model provides an energy storage battery, the positive current collector 005 of which is respectively welded with the positive electrode of the battery core 004 and the positive electrode post 063, the negative current collector 003 is respectively welded with the negative electrode of the battery core 004 and the negative electrode post 023, the contact area between the positive current collector 005 and the positive electrode of the battery core 004 is increased, the contact area between the negative current collector 003 and the negative electrode of the battery core 004 is also increased, the connection resistance is reduced, the high-current bearing capacity is high, the current density and the temperature field are uniform, the high-rate charge and discharge performance of the battery core 004 is realized, in addition, the positive current collector 005 and the positive electrode post 063 are connected together in a flexible connection mode, the positive current collector 005 is tightly pressed on the positive electrode post 063 through the flexible connection mode, the negative current collector 003 and the negative electrode post 023 are connected together in a flexible connection mode, the negative current collector 003 is tightly connected with the negative electrode post 023 through the flexible connection mode, and the structure stability, the consistency and the safety and the reliability of the energy storage battery are greatly improved.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims

1. An energy storage battery, comprising:

a housing;

the battery cell is positioned in the shell;

the positive electrode current collector comprises a positive electrode plate and a positive electrode elastic sheet, the positive electrode elastic sheet is bent from one end of the positive electrode plate to the surface of the positive electrode plate, and the positive electrode plate is welded to the positive electrode of the battery cell;

the positive electrode assembly comprises a positive electrode end cover, a positive electrode column, a first sealing piece and a first insulating ring, wherein the positive electrode end cover is provided with a positive electrode hole, the positive electrode column penetrates through the positive electrode hole, the first sealing piece is positioned between the positive electrode end cover and the positive electrode column and seals the positive electrode hole, the first insulating ring surrounds the positive electrode column, the positive electrode end cover is connected with the first insulating ring, the first insulating ring is connected with the shell, and the positive electrode elastic sheet is welded to the positive electrode column;

the negative electrode current collector comprises a negative electrode plate and a negative electrode elastic piece, the negative electrode elastic piece is bent from one end of the negative electrode plate to the plate surface of the negative electrode plate, and the negative electrode plate is welded to the negative electrode of the battery cell;

the negative pole subassembly, the negative pole subassembly includes negative pole end cover, negative pole post, second sealing member, second insulating circle, the negative pole end cover is equipped with the negative pole hole, the negative pole post passes the negative pole hole, the second sealing member is located the negative pole end cover with between the negative pole post and sealed the negative pole hole, the second insulating circle encloses outside the negative pole post, the negative pole end cover with the second insulating circle links to each other, the second insulating circle with the casing links to each other, the negative pole shell fragment weld in the negative pole post.

2. The energy storage cell of claim 1, wherein: the first sealing piece comprises a first injection molding piece, the first injection molding piece is sleeved outside the positive pole, and the first injection molding piece is clamped between the positive pole and the positive end cover.

3. The energy storage cell of claim 2, wherein: the positive pole post is equipped with round first recess, first recess encircles the center pin of positive pole post, first injection molding orientation positive pole post's one side is equipped with round first fin, first fin embedding first recess.

4. The energy storage cell of claim 2, wherein: one end of the positive pole is provided with a positive limiting ring, the diameter of the positive limiting ring is larger than the aperture of the positive pole hole, and the positive limiting ring is positioned on one side of the positive pole hole, which is close to the positive pole of the battery cell.

5. The energy storage cell of claim 4, wherein: the first sealing piece further comprises a first sealing ring, the first sealing ring is sleeved outside the positive pole, and the first sealing ring is clamped between the first insulating ring and the positive limiting ring.

6. The energy storage cell of claim 1, wherein: the one side of first insulating circle towards the anodal end cover is equipped with a plurality of first bumps, anodal end cover corresponds first bump is equipped with a plurality of first pits, first bump embedding first pit.

7. The energy storage cell of claim 1, wherein: the positive end cover is provided with an explosion-proof hole, the first insulating ring is provided with an explosion-proof valve, and the explosion-proof valve is opposite to the explosion-proof hole.

8. The energy storage cell of claim 1, wherein: the positive pole is provided with a liquid injection hole, and the liquid injection hole is communicated with the battery cell.

9. The energy storage cell of claim 1, wherein: the second sealing piece comprises a second injection molding piece, the second injection molding piece is sleeved outside the negative pole column, and the second injection molding piece is clamped between the negative pole column and the negative pole end cover.

10. The energy storage cell of claim 1, wherein: one end of the negative pole is provided with a negative limiting ring, the diameter of the negative limiting ring is larger than the aperture of the negative pole hole, and the negative limiting ring is positioned on one side of the negative pole hole, which is close to the negative pole of the battery cell.