CN218677266U

CN218677266U - Cylindrical battery

Info

Publication number: CN218677266U
Application number: CN202222632022.2U
Authority: CN
Inventors: 程胜兵; 蒋远富; 谢林霞; 李博一
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2023-03-21
Anticipated expiration: 2032-10-08

Abstract

The utility model relates to a power cylinder type battery technical field provides a cylinder type battery, it includes casing, block, utmost point post, book core, water conservancy diversion portion and insulating part, through the second core section that sets up on rolling up the core, its surface is towards keeping away from the polymerization of first core section, hold the second core section with the internal surface of water conservancy diversion portion counterbalance and carry out the overcurrent and conduct, compare the circular terminal surface that adopts the current collector plate in the prior art and the circular terminal surface contact of utmost point ear, not only increased the area of overflowing and heat radiating area, ensured that the electric core overflows, improved the radiating effect, and need not water conservancy diversion portion and the welding of rolling up the core tip, saved one welding process, simplified preparation technology; the insulating part that sets up is the silica gel heat conduction pad, can make to form between water conservancy diversion portion and the block, plays insulation protection to water conservancy diversion portion, can go out the heat conduction that overflows electrically conductive production simultaneously, further improvement the radiating effect, the effectual thermal runaway who prevents the cylinder battery.

Description

Cylindrical battery

Technical Field

The utility model relates to a power cylinder type battery technical field especially relates to a cylinder type battery.

Background

With the rapid development of lithium ion battery technology, the lithium battery has the characteristics of high capacity and high safety, and is widely applied to the fields of automobiles, aerospace, consumer electronics and the like, and generally, the packaging types of the lithium battery are cylindrical, square and soft packages.

Chinese patent publication No. CN215869572U discloses a power type cylindrical battery, which includes a cylindrical case, an electrode assembly, a positive current collecting plate, and a positive cover plate, the case is formed with an accommodating space for accommodating the electrode assembly and has an opening and a bottom wall oppositely disposed, the electrode assembly is located in the accommodating space and has a positive end and a negative end, the positive current collecting plate is laser-welded to the positive end, the positive cover plate is fixedly connected to the positive current collecting plate, and an edge portion of the positive cover plate is laser-welded to the case to close the opening, and the negative end is laser-welded to the bottom wall.

The cylindrical battery adopting the technical scheme has the advantages that the cylindrical battery adopts a laser welding mode for the current collecting disc, the current collecting disc is welded with the full lug, the current collecting disc and the terminal end of the battery core are fixed by the threads of the fastener, the battery core terminal and the full lug are reliably connected together, the current adopted current collecting disc and the surface of the full lug are both circular planes, the flow area of the current collecting disc is smaller than the heat dissipation area of the full lug, the normal flow of the battery core and the heat dissipation of the full lug cannot be guaranteed, and therefore the improved cylindrical battery is provided for solving the problem.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a cylinder type battery has increased area and heat radiating area, has ensured that electric core overflows and dispels the heat, simultaneously, need not the welding and overflows the structure, and production efficiency is high.

The technical scheme of the utility model is realized like this: the utility model provides a cylinder type battery, it includes casing, block and utmost point post, the casing is for having open-ended hollow container, the block set up in the opening part of casing is used for sealing the container inner space of casing, the through-hole has been seted up on the block, utmost point post inserts and locates in the through-hole, the battery still includes:

the winding core is arranged in the shell, the cylindrical first core section and at least one second core section with the surface facing away from the first core section are aggregated, the outer surface of the second core section is aggregated towards one end away from the first core section, and the plane end of the second core section is connected with the end surface of the first core section;

and the flow guide part is attached to the arc-shaped surface of the second core section, one end of the flow guide part is connected with the winding core, and the other end of the flow guide part is connected with the pole column and is used for transmitting the current of the winding core to the pole column.

On the basis of the above technical solution, preferably, the shape of the flow guiding portion is matched with the shape of the second core segment, the flow guiding portion is located in the cap, and the inner surface of the cap and the outer surface of the flow guiding portion are arranged in a gap and are insulated from each other.

Based on the above technical solution, preferably, the profile of the second core segment is one of a hemisphere shape, an ellipsoid shape, a truncated cone shape or a cone shape.

In addition to the above technical means, it is preferable that the insulation part is further included, wherein,

the insulating part is fixed between the cap and the gap of the flow guide part, and the insulating part is used for insulating and protecting the flow guide part.

On the basis of above technical scheme, preferred, the insulating part with the water conservancy diversion portion is kept away from a side end face and the block of utmost point post are close to the terminal surface looks parallel and level of casing one side.

On the basis of above technical scheme, preferably, the one end that utmost point post is close to roll core runs through the block with the insulating part and with the terminal surface that is close to mutually of water conservancy diversion portion is fixed mutually.

On the basis of the above technical scheme, preferably, the insulating part is a silica gel heat conducting pad.

On the basis of the above technical solution, preferably, there are two second core segments, and the two second core segments are symmetrically and alternately arranged at two ends of the first core segment in the axial extension direction.

On the basis of the above technical solution, preferably, the cap and the housing are welded and fixed.

On the basis of the technical scheme, preferably, the current collecting section center of the winding core is provided with a liquid injection hole, and the liquid injection hole is used for conveniently injecting electrolyte into the winding core.

The utility model discloses a cylinder type battery has following beneficial effect for prior art:

(1) The second core section arranged on the winding core is polymerized with the surface facing away from the first core section, and the second core section is abutted against the inner surface of the flow guide part for overcurrent conduction, compared with the prior art that the circular end surface of the current collecting disc is contacted with the circular end surface of the lug, the overcurrent area and the heat dissipation area are increased, the overcurrent of the battery cell is ensured, the heat dissipation effect is improved, the end part of the winding core is not required to be welded by the flow guide part, a welding procedure is omitted, and the preparation process is simplified;

(2) The insulating part that sets up is the silica gel heat conduction pad, can make to form between water conservancy diversion portion and the block, plays insulation protection to water conservancy diversion portion, can go out the heat conduction that overflows electrically conductive production simultaneously, further improvement the radiating effect, the effectual thermal runaway who prevents the cylinder battery.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a cylindrical battery of the present invention;

fig. 2 is a front view of a cylindrical battery according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1-2, the present invention relates to a cylindrical battery, which comprises a housing 1, a cap 2, a terminal post 3, a winding core 4, a flow guiding portion 5 and an insulating portion 6.

The shell 1 is generally made of metal materials and is convenient to weld with the cover cap 2, wherein the shell 1 is a hollow container with an opening and is convenient for the roll core 4 to be packed.

It should be noted that, the material of casing 1 adopts the steel in this embodiment, because the rigidity material has intensity height, toughness and plasticity are good, the material is even and the advantage that structural reliability is high, is fit for being used for bearing impact and dynamic load, has good anti-seismic performance, has played good protection effect to the roll core of casing 1 inside, chooses for use steel still conveniently to carry out welded fastening with block 2 simultaneously.

And, the opening has all been seted up at the both ends of casing 1 in this implementation, this design is to positive negative pole and the insulating battery of casing 1, wherein, block 2, utmost point post 3, roll up core 4, the quantity of water conservancy diversion portion 5 and insulating part 6 is two and the relative corresponding setting, wherein, the second core section 42 of roll up core 4 is two, two second core sections 42 symmetry and the spaced setting are at the both ends of the axial extending direction of first core section 41, the second core section 42 of roll up core 4 both sides respectively with two water conservancy diversion portions 5 mutual contact, overflow the positive negative pole and electrically conduct to two utmost point posts 3, make it positively charged and negatively respectively.

In addition, the casing 1 is also designed with a cylindrical structure with an opening at one end and a bottom plate at the other end, that is, the casing 1 is electrically connected with one of the positive electrode and the negative electrode and insulated from the other, and the other electrode is connected with the battery cell outside the casing 1, so as to form a positive electrode and a negative electrode.

The cap 2 is arranged at an opening of the casing 1 and used for sealing the inner space of the container of the casing 1, a through hole is arranged on the cap 2, and the pole 3 is inserted into the through hole.

It should be noted that, the cap 2 and the housing 1 are welded and fixed, and the welding between the cap and the housing is completed by laser welding, because the laser welding has high energy density, small welding deformation and small heat affected zone, the precision of the workpiece can be effectively improved, the welding line is smooth, free of impurities, uniform and compact, no additional polishing work is needed, the cold joint can be reduced, and the yield can be improved.

In addition, in this embodiment, the cap 2 and the housing 1 may be fixed by strong magnetic adsorption, as long as the cap 2 and the housing 1 are fixed in a manner that the relative position does not move or fall off.

And, utmost point post 3 is inserted and is established and the through-hole, wherein, the insulating setting between utmost point post 3 and the block 2, it is insulating to be through being provided with sealing washer and insulating cover between utmost point post 3 and block 2, and the outside welded fastening of utmost point post 3 has two clamping rings, two clamping rings are located the both sides of round hole respectively, and laminate mutually with block 2, this scheme can adopt a battery apron that chinese patent publication is CN211858695, the insulating connection structure between block 2 and the utmost point post 3 that discloses, this technique is the open technology, do not do this again and describe much here.

The winding core 4 is arranged in the shell 1 and comprises a cylindrical first core section 41 and at least one hemispherical second core section 42, the outer surface of the second core section 42 is arranged in a converging manner towards one end far away from the first core section 41, and the plane end of the second core section 42 is connected with the end surface of the first core section 41.

It should be noted that, the roll core 4 is a full tab roll core, the roll core 4 includes a positive plate, a negative plate and a diaphragm, when the full tab battery is wound, the side surface of the positive plate which is not coated on one side edge when the positive plate is coated with the positive material and the side surface of the negative plate which is left blank when the negative plate is coated with the negative material are both used as tabs, the positive and negative plates are isolated by the diaphragm, the positive/negative current collectors are respectively leaked from the two sides of the roll core 4, and then the end surfaces of the current collector foil materials are kneaded into the second core section 42.

The water conservancy diversion portion 5 is pasted on the arc-shaped surface of the second core section 42, one end of the water conservancy diversion portion is connected with the roll core 4, and the other end of the water conservancy diversion portion is connected with the pole 3 and used for transmitting the current of the roll core 4 to the pole 3.

According to this embodiment, through the second core section 42 that sets up on rolling up core 4, its surface is towards keeping away from first core section 41 polymerization, hold

second core section

42 and 5 internal surfaces offsets of water conservancy diversion portion and carry out overflowing electrically conductive, compare prior art and adopt the circular terminal surface of current collecting disc and the circular terminal surface of utmost point ear to contact and compare, not only increased overcurrent area and heat radiating area, ensured that electric core overflows, the radiating effect has been improved, and need not water

conservancy diversion portion

5 and 4 tip welding of book core, a welding process has been saved, the preparation technology has been simplified.

The current guiding portion 5 is made of a metal conductive material, and is used for conducting current on the pole piece of the winding core 4 to the pole post 3 in an overcurrent manner.

In the embodiment, the shape of the flow guiding portion 5 is matched with the shape of the second core segment 42, the flow guiding portion 5 is located in the cap 2, and the inner surface of the cap 2 and the outer surface of the flow guiding portion 5 are arranged in a gap and are insulated from each other.

It should be noted that, can compress tightly 4 utmost point ear of book core through setting up laminating each other between two hemispheroids, because the positive plate that rolls up 4 at present adopts copper, and the negative pole piece adopts aluminium, all is metal material, and then has certain plasticity, so insert the back, can make its inseparable laminating mutually with water conservancy diversion portion 5 through the plastic deformation reduction of rolling up 4, the effectual electric core that has ensured overflows.

And, the profile of the second core segment 42 is one of hemispherical, ellipsoidal, truncated cone, or conical.

Specifically, the second core segment 42 in this embodiment is hemispherical in profile.

As a preferred embodiment, when the diversion portion 5 abuts against the second core segment 42, the end surface of one side of the cap 2 close to the casing 1 is attached to the end surface of one side of the casing 1, so as to facilitate the close welding between the cap 2 and the casing 1, wherein a sealing ring can be further arranged on the end surface of one side of the cap 2 close to the casing 1, so as to improve the sealing performance of the connection between the cap 2 and the casing 1.

As a preferred embodiment, the center of the tapered end face of the current collector of the winding core 4 is provided with an injection hole 400, and the injection hole 400 is used for conveniently injecting electrolyte into the winding core 4.

The anode plate and the cathode plate of the winding core 4 are subjected to electrolytic reaction through \ "23510,", so as to generate positive ions and negative ions, and then the positive ions and the negative ions are respectively conducted to the pole posts 3 through overcurrent through the two flow guide parts 5.

The insulation part 6 is fixed between the gap between the cap 2 and the flow guide part 5, and the insulation part 6 is used for insulating and protecting the flow guide part 5.

The insulating part 6 is provided to insulate the current guiding part 5 from the cap 2, wherein the outer wall of the insulating part 6 is completely attached to and fixed to the inner wall of the cap 2, and the inner wall of the insulating part 6 is completely attached to and fixed to the outer wall of the current guiding part 5, so that the current guiding part 5 can be well insulated and prevented from being conducted to the cap 2.

In a preferred embodiment, the insulating portion 6 is a silicone heat conducting pad.

It should be noted that, the advantage of design like this lies in, silica gel heat conduction material has good heat conductivity, can go out the heat conduction that core 4 overflowed the electrically conductive production to water conservancy diversion portion 5, and further improvement the radiating effect, the effectual thermal runaway who prevents the cylinder battery.

In a preferred embodiment, the end surfaces of the insulating part 6 and the flow guiding part 5 far away from the pole 3 are flush with the end surface of the cap 2 near the housing 1.

It should be noted that, the advantage of such design lies in, after core 4 and water conservancy diversion portion 5 inserted completely, what the laminating of two terminal surfaces of block 2 and casing 1 was more level and more smooth this moment, made things convenient for welded fastening between block 2 and the casing 1.

In a preferred embodiment, one end of the pole 3 close to the winding core 4 penetrates through the cap 2 and the insulating part 6 and is fixed to the end face close to the flow guide part 5.

It should be noted that, when the winding core 4 and the current guiding portion 5 are inserted, the current guiding portion 5 can conduct the overcurrent to the terminal 3, and the insulation between the current guiding portion 5 and the cap 2 can be achieved through the insulating portion 6.

The utility model discloses an assembly method of cylinder type battery is introduced below:

firstly, winding the end surfaces of two current collectors of a winding core 4 in the production process of the winding core to be hemispherical;

then, the winding core 4 is put into the case 1;

then, the cover cap 2 is buckled with the shell 1, so that the inner surface of the flow guide part 5 is attached to the outer surface of the second core section 42 of the winding core 4;

finally, the cap 2 and the case 1 are welded and fixed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a cylindrical battery, its includes casing (1), block (2) and utmost point post (3), casing (1) is for having open-ended hollow container, block (2) set up in the opening part of casing (1) is used for sealing the container inner space of casing (1), the through-hole has been seted up on block (2), utmost point post (3) are inserted and are located in the through-hole, its characterized in that: the battery further includes:

the winding core (4) is arranged in the shell (1) and comprises a cylindrical first core segment (41) and at least one second core segment (42), the outer surface of the second core segment (42) is arranged towards one end far away from the first core segment (41) in a polymerization manner, and the plane end of the second core segment (42) is connected with the end face of the first core segment (41);

and the flow guide part (5) is attached to the arc-shaped surface of the second core section (42), one end of the flow guide part is connected with the roll core (4), and the other end of the flow guide part is connected with the pole column (3) and is used for transmitting the current of the roll core (4) to the pole column (3).

2. The cylindrical battery as defined in claim 1, wherein: the shape of the flow guide part (5) is matched with that of the second core section (42), the flow guide part (5) is located in the cover cap (2), and the inner surface of the cover cap (2) and the outer surface of the flow guide part (5) are arranged in a clearance mode and are mutually insulated.

3. The cylindrical battery as defined in claim 1, wherein: the second core segment (42) has a profile that is one of hemispherical, ellipsoidal, truncated cone, or conical.

4. The cylindrical battery as defined in claim 2, wherein: also comprises an insulating part (6), wherein,

the insulation part (6) is fixed between the cap (2) and the gap of the flow guide part (5), and the insulation part (6) is used for insulating and protecting the flow guide part (5).

5. The cylindrical battery as defined in claim 4, wherein: the insulating part (6) and the flow guide part (5) are far away from one side end face of the pole (3) and the end face of the cap (2) close to one side of the shell (1) are parallel and level.

6. The cylindrical battery as defined in claim 4, wherein: one end of the pole column (3) close to the winding core (4) penetrates through the cap (2) and the insulating part (6) and is fixed with the end face of the flow guide part (5) close to the end face.

7. The cylindrical battery as defined in claim 4, wherein: the insulating part (6) is a silica gel heat conducting pad.

8. The cylindrical battery as defined in claim 1, wherein: the number of the second core segments (42) is two, and the two second core segments (42) are symmetrically arranged at two ends of the first core segment (41) in the axial extension direction at intervals.

9. The cylindrical battery as defined in claim 1, wherein: the cover cap (2) and the shell (1) are fixed in a welding mode.

10. The cylindrical battery as defined in claim 1, wherein: liquid injection hole (400) has been seted up at the mass flow section center department of rolling up core (4), liquid injection hole (400) are used for conveniently pouring into electrolyte to rolling up core (4) inside.