CN211719637U

CN211719637U - Bean type battery

Info

Publication number: CN211719637U
Application number: CN202020328196.8U
Authority: CN
Inventors: 李桂平; 葛辉明; 李碧梅; 李念; 袁中直; 祝媛; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-10-20
Anticipated expiration: 2030-03-16

Abstract

The utility model discloses a bean type battery, including shell and coiling type electricity core, the shell includes drain pan and block, drain pan and block are the metalwork, the drain pan includes that bottom plate and ring establish the first leg at the side of bottom plate, the block includes that roof and ring establish the second leg at the side of roof, second leg cover is established outside first leg, be provided with first arc portion on the first leg, be provided with on the second leg with first arc portion complex second arc portion, the surface paste of first leg has first insulation seal membrane, the internal surface paste of second leg has second insulation seal membrane, first insulation seal membrane solidifies as the integrative sealing layer behind second insulation seal membrane butt, the pole piece of coiling type electricity core is rectangular shape, its length direction's center sets up a utmost point ear or sets up two at least utmost point ears on it. The utility model discloses a beans formula battery simple structure, it is sealed effectual, space utilization and energy density are high, can realize filling soon and discharge with big multiplying power.

Description

Bean type battery

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a beans formula battery.

Background

A bean cell is a very small size cell, also known as a button cell or button cell. The bean type battery generally comprises a bottom shell, a cover cap and an electric core arranged in a containing cavity formed by the bottom shell and the cover cap, and the sealing difficulty of the bean type battery is very large due to the very small size of the bean type battery. The conventional assembly process for a bean cell is as follows: and (4) sleeving the sealing ring on the bottom shell, placing the battery cell and the like, and covering the cap on the bottom shell for sealing treatment. The bean-type battery thus prepared has the following drawbacks: 1. the upper end of the sealing ring is generally provided with a hook structure to be hung on the top of the bottom shell, the structure and the assembly sealing process of the sealing ring are complex, the manufacturing cost is high, the online production time of the bean type battery can be prolonged, and the capacity can be reduced; 2. the sealing ring part is positioned on the inner wall of the bottom shell, so that the space inside the bottom shell is occupied, and the space utilization rate and the energy density of a battery are reduced; 3. the bean type battery is small in size, so that the thickness of the sealing ring needs to be very thin, the manufacturing difficulty of the sealing ring is increased, meanwhile, the consistency of the thickness and the size of the thin sealing ring is difficult to guarantee, and the sealing performance of the assembled battery is poor.

In addition, the tabs of the winding type battery cell of the conventional bean type battery are all positioned at the end part of the pole piece, so that the existing bean type battery has short plates on the aspects of quick charge and high-rate discharge performance.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the bean type battery is simple in structure, good in sealing effect, high in space utilization rate and high in energy density.

The embodiment of the utility model provides a another aim at: provided is a bean type battery capable of realizing quick charge and high-rate discharge performance.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

the utility model provides a bean type battery, including the shell with set up electric core in the shell, the shell includes drain pan and block, the drain pan with the block is the metalwork, the drain pan includes the bottom plate and encircles the first leg of a side of bottom plate, the block includes the roof and encircles the second leg of a side of roof, the second leg cover is established outside the first leg, be provided with first arc portion on the first leg, be provided with on the second leg with first arc portion complex second arc portion, the surface paste of first leg has first insulating seal membrane, the internal surface paste of second leg has second insulating seal membrane, solidify into an organic whole after first insulating seal membrane and the second insulating seal membrane butt and form the sealing layer; the pole piece of coiling formula electricity core is rectangular shape, works as when setting up a utmost point ear on the pole piece, utmost point ear sets up the length direction's of pole piece central point puts, works as set up at least two on the pole piece during the utmost point ear, at least one utmost point ear sets up on the length direction of pole piece, set up the length direction of pole piece the length of utmost point ear is followed the axis direction of coiling formula electricity core extends, utmost point ear extends to the outside of coiling formula electricity core.

As a preferable mode of the bean type battery, the first surrounding wall is provided with a plurality of continuous first arc-shaped parts along an axial direction thereof, and the second surrounding wall is provided with a plurality of second arc-shaped parts matched with the first arc-shaped parts along the axial direction thereof.

As a beans formula battery's an preferred scheme, the surface of drain pan all sets up first insulation seal membrane, the bottom plate surface be provided with the first hole of dodging on the first insulation seal membrane, the internal surface of block all sets up the second insulation seal membrane, the roof internal surface be provided with the second on the second insulation seal membrane and dodge the hole, utmost point ear includes anodal ear and negative pole ear, anodal ear with one in the negative pole ear passes the second dodge the hole with roof internal surface welds, another in anodal ear and the negative pole ear with the internal surface welds of bottom plate.

As a preferable mode of the bean type battery, the first arc-shaped part is annularly arranged on the first surrounding wall, and a plurality of the first arc-shaped parts are parallel along the axial direction of the first surrounding wall; or the like, or, alternatively,

a plurality of first arc-shaped parts are spirally wound on the first surrounding wall along the axial direction of the first surrounding wall; or the like, or, alternatively,

the first arc-shaped part comprises a plurality of sub arc-shaped parts which are arranged along the circumferential direction of the first surrounding wall at intervals.

As a preferable mode of the bean type battery, the first arc-shaped part is formed by punching or rolling the first surrounding wall, and the second arc-shaped part is formed by punching or rolling the second surrounding wall.

As a preferable mode of the bean type battery, all of the first arc-shaped parts are arranged to protrude toward the center of the first surrounding wall, and all of the second arc-shaped parts are arranged to protrude toward the center of the second surrounding wall; or the like, or, alternatively,

all the first arc-shaped parts are arranged in a protruding mode towards the center, which is far away from the first surrounding wall, and all the second arc-shaped parts are arranged in a protruding mode towards the center, which is far away from the second surrounding wall; or the like, or, alternatively,

the protruding directions of two adjacent first arc-shaped parts on the first surrounding wall are opposite, the first arc-shaped parts form a first wavy structure on the first surrounding wall, and the second arc-shaped parts on the second surrounding wall form a second wavy structure matched with the first wavy structure.

As a preferable scheme of the bean type battery, when at least two tabs are arranged on the pole piece, all the tabs are arranged at intervals along the length direction of the pole piece.

As a preferable scheme of the bean type battery, one of the tabs is located at the center of the pole piece in the length direction, and the rest of the tabs are arranged at intervals with the tabs located at the center of the pole piece in the length direction.

As a preferable scheme of the bean type battery, at least three and singular number of the tabs are arranged on the pole piece, one of the tabs is located at the center of the pole piece in the length direction, and the rest tabs are symmetrically arranged relative to the center of the pole piece in the length direction.

As a preferred scheme of the bean-type battery, when at least two tabs are arranged on the pole piece, the tabs are arranged in both the length direction and the width direction of the pole piece, and the tabs arranged in the width direction of the pole piece extend along the radial direction of the winding-type battery core.

As a bean type battery's a preferred scheme, the pole piece includes the mass flow body and coating active material on the mass flow body, the mass flow body has the edge the radial direction of coiling formula electricity core extends to the outer extension of active material, the extension is buckled the back part coincide, the extension with the pole piece is the contained angle setting, the extension forms and is located pole piece width direction is ascending utmost point ear.

As a preferable scheme of the bean-type battery, the winding-type battery cell comprises a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate;

the diaphragm is provided with an isolation part extending to two ends of the negative plate along the axial direction of the winding type battery cell, and the isolation part is used for isolating a lug of the winding type battery cell from the end surface of the winding type battery cell; or, two terminal surfaces of coiling formula electricity core all are provided with the insulating piece, the insulating piece is used for keeping apart the utmost point ear of coiling formula electricity core with the terminal surface of coiling formula electricity core.

As a preferable aspect of the bean type battery, all of the separators are inclined toward the center of the wound electric core.

As a preferable scheme of the bean-type battery, a necking part is formed at one end of the second surrounding wall, which is far away from the top plate, and the end part of the necking part abuts against the outer wall of the first surrounding wall or the outer wall of the bottom plate; or one end of the second surrounding wall, which is far away from the top plate, is abutted against the outer wall of the first surrounding wall.

As a preferred scheme of the bean type battery, the bean type battery further comprises an auxiliary part, the auxiliary part is a cylinder structure with two open ends and has a first end and a second end which are arranged oppositely, one end of the winding type battery cell, which is far away from the bottom plate, is inserted into the first end, and the second end is located above the winding type battery cell.

As a preferable mode of the bean type battery, the auxiliary member is formed by winding adhesive tape, and the first end of the auxiliary member is adhered to the outer peripheral part of the winding type battery cell; or the like, or, alternatively,

the material of the auxiliary piece is consistent with that of a diaphragm of the winding type battery cell, and the auxiliary piece is wrapped on the peripheral part of the winding type battery cell; or the like, or, alternatively,

the auxiliary part and the winding type battery cell are of an integrated structure.

In a preferred embodiment of the bean cell, the insulating sealing film is any one of a CPP film, a PPA film, a modified PP film, and a composite film layer of PPA and PP.

The utility model discloses beneficial effect does: the insulating sealing films are respectively stuck to the contact positions of the first surrounding wall and the second surrounding wall, so that the thickness consistency of the insulating sealing films stuck to the two surrounding walls is good, the sealing effect can be improved, the insulating sealing films can be very thin, the space utilization rate in the shell can be further increased, and the energy density of the battery can be improved; the two layers of insulating sealing films are solidified into the sealing layer, primary sealing is realized when the two layers of insulating sealing films are abutted, secondary sealing is realized when the two layers of insulating sealing films are solidified into the sealing layer, and the sealing property between the bottom shell and the cover cap is greatly improved by twice sealing; the corresponding arc-shaped parts are arranged on the first surrounding wall and the second surrounding wall, the sealing layer can be compressed between the first surrounding wall and the second surrounding wall through the arrangement of the arc-shaped parts, the sealing property between the bottom shell and the cap is obviously improved, the sealing layer can be protected through the arrangement of the arc-shaped parts, the sealing layer is prevented from being damaged when the cap is sealed, the service life of the sealing layer is prolonged, and meanwhile, the sealing between the bottom shell and the cap is ensured not to lose efficacy; the bean type battery can meet the requirements of quick charging and high-rate discharging by arranging a single lug in the central position of the pole piece of the winding type battery cell in the length direction or arranging a plurality of lugs on the pole piece.

Drawings

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

Fig. 1 is a schematic cross-sectional view of a bean type battery according to a first embodiment of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic cross-sectional view of a bean type battery according to a second embodiment of the present invention.

Fig. 4 is an exploded view of fig. 3.

Fig. 5 is a schematic cross-sectional view of a bean type battery according to a third embodiment of the present invention.

Fig. 6 is an exploded view of fig. 5.

Fig. 7 is a schematic cross-sectional view of a bean type battery according to a fourth embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view of a bean type battery according to a fifth embodiment of the present invention.

Fig. 9 is a schematic cross-sectional view of a bean type battery according to a sixth embodiment of the present invention.

Fig. 10 is an assembly diagram of the pole piece and the tab in an expanded state according to an embodiment of the present invention.

Fig. 11 is an assembly diagram of a pole piece and a tab in an unfolded state according to another embodiment of the present invention.

Fig. 12 is an assembly view of a pole piece and a tab in an unfolded state according to another embodiment of the present invention.

Fig. 13 is an assembly diagram of a pole piece and a tab in an expanded state according to yet another embodiment of the present invention. In the figure:

1. a winding type battery cell; 11. a tab; 111. a positive tab; 112. a negative tab; 12. pole pieces; 121. a positive plate; 122. a negative plate; 13. a diaphragm; 131. an isolation section; 14. an extension portion; 15. a reinforcement;

2. a bottom case; 21. a base plate; 22. a first enclosure wall; 23. a first arcuate portion;

3. capping; 31. a top plate; 32. a second enclosure wall; 33. a second arcuate portion; 34. necking part

4. A first insulating sealing film; 41. a first avoidance hole;

5. a second insulating sealing film; 51. a second avoidance hole;

6. an auxiliary member.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, 2, and 10 to 13, a bean-type battery provided by an embodiment of the present invention includes a housing and a winding-type electric core 1 disposed in the housing, the housing includes a bottom case 2 and a cap 3, the bottom case 2 and the cap 3 are both metal pieces, the bottom case 2 includes a bottom plate 21 and a first wall 22 annularly disposed on a side surface of the bottom plate 21, the cap 3 includes a top plate 31 and a second wall 32 annularly disposed on a side surface of the top plate 31, the second wall 32 is sleeved outside the first wall 22, the first wall 22 is provided with a plurality of continuous first arc portions 23 along an axial direction thereof, the second wall 32 is provided with a plurality of second arc portions 33 along an axial direction thereof, the outer surface of the first wall 22 is adhered with a first insulating sealing film 4, the inner surface of the second wall 32 is adhered with a second insulating sealing film 5, first insulating seal membrane 4 with solidify after 5 butts of second insulating seal membrane as an organic whole sealing layer, pole piece 12 of coiling formula electricity core 1 is rectangular shape, works as when setting up a utmost point ear 11 on the pole piece 12, utmost point ear 11 sets up the length direction's of pole piece 12 central point puts, works as set up at least two on the pole piece 12 during utmost point ear 11, at least one utmost point ear 11 sets up on the length direction of pole piece 12, set up the length direction of pole piece 12 the length of utmost point ear 11 is followed coiling formula electricity core 1's axis direction extends, utmost point ear 11 extends to coiling formula electricity core 1's outside. By respectively sticking a layer of insulating sealing film at the contact positions of the first surrounding wall 22 and the second surrounding wall 32, the thickness consistency of the insulating sealing films stuck on the two surrounding walls is good, the sealing effect can be improved, the insulating sealing films can be very thin, the space utilization rate in the shell can be further increased, and the energy density of the battery can be improved; the two layers of insulating sealing films are solidified into the sealing layer, primary sealing is realized when the two layers of insulating sealing films are abutted, secondary sealing is realized when the two layers of insulating sealing films are solidified into the sealing layer, and the sealing performance between the bottom shell 2 and the cover cap 3 is greatly improved by the two times of sealing; the corresponding arc-shaped parts are arranged on the first surrounding wall 22 and the second surrounding wall 32, the sealing layers can be compressed between the first surrounding wall 22 and the second surrounding wall 32 through the arrangement of the arc-shaped parts, the sealing performance between the bottom case 2 and the cap 3 is obviously improved, the sealing layers can be protected through the arrangement of the arc-shaped parts, the sealing layers are prevented from being damaged when the cap 3 is sealed, the service life of the sealing layers is prolonged, and meanwhile, the sealing between the bottom case 2 and the cap 3 is ensured not to be failed; the single tab 11 is arranged at the central position of the pole piece 12 of the winding type battery cell 1 in the length direction, or a plurality of tabs 11 are arranged on the pole piece 12, so that the bean type battery can meet the requirements of quick charge and high-rate discharge.

The first insulating sealing film 4 adhered to the outer surface of the first surrounding wall 22 may be specifically: the outer surface of the first surrounding wall 22 is entirely covered with the first insulating sealing film 4, or the outer surface portion of the first surrounding wall 22 is covered with the first insulating sealing film 4.

Similarly, the second insulating sealing film 5 adhered to the outer surface of the second surrounding wall 32 may be: the outer surface of the second surrounding wall 32 is entirely covered with the second insulating sealing film 5, or the outer surface portion of the second surrounding wall 32 is covered with the second insulating sealing film 5.

The first insulating sealing film 4 and the first surrounding wall 22 may be formed by: firstly, sticking a first insulating sealing film 4 on the surface of a metal piece, then forming a hole at a corresponding position, then cutting and stamping to form a bottom shell 2, and arranging the first insulating sealing film 4 on the outer surface of a first surrounding wall 22 of the bottom shell 2; secondly, forming holes in the corresponding positions of the first insulating sealing film 4, then adhering the holes to the surface of a metal piece, and then cutting and stamping the metal piece to form the bottom shell 2, wherein the first insulating sealing film 4 is arranged on the outer surface of the first surrounding wall 22 of the bottom shell 2; thirdly, the metal member is cut and punched to form the bottom case 2, and then the first insulating sealing film 4 is attached to the outer surface of the first surrounding wall 22 of the bottom case 2. The second insulating sealing film 5 and the second surrounding wall 32 are formed in the manner described above.

Preferably, referring to fig. 1, 2 and 7, the surface of drain pan 2 all sets up first insulating sealing film 4, bottom plate 21 surface be provided with first dodge hole 41 on the first insulating sealing film 4, the internal surface of block 3 all sets up second insulating sealing film 5, roof 31 internal surface be provided with second dodge hole 51 on the second insulating sealing film 5, preferably, with the size of first dodge hole 41 unanimous with the size of bottom plate 21 for the surface of whole bottom plate 21 can expose. One of the positive tab 111 and the negative tab 112 of the winding-type battery cell 1 passes through the second avoidance hole 51 to be welded to the inner surface of the top plate 31, and the other of the positive tab 111 and the negative tab 112 is welded to the inner surface of the bottom plate 21. Insulating seal membrane is pasted entirely to one of them side of drain pan 2 and block 3, the drain pan 2 and the first insulating seal membrane 4 of metal, the block 3 and the second insulating seal membrane 5 of metal all form metal plastic film spare, make whole shell adopt metal plastic film spare to make, need not to set up the sealing washer alone and seal the junction of drain pan 2 and block 3, make fashioned drain pan 2 and block 3 from taking seal structure (being insulating seal membrane) after the metal plastic film spare supplied materials, this process of installation sealing washer has been saved, the production efficiency is promoted, the production cost is reduced. In addition, the arrangement of the first avoidance hole 41 facilitates the conduction of the bottom case 2 and the outside, and the arrangement of the second avoidance hole 51 facilitates the electric connection of the tab 11 and the cap 3. The second avoiding hole 51 is formed in the position, corresponding to the tab 11 to be welded, of the second insulating sealing film 5 on the inner surface of the cap 3, and when the second avoiding hole 51 is formed, attention is paid to the fact that the second insulating sealing film cannot penetrate through the top plate 31 of the cap 3, the first avoiding hole 41 is formed in the first insulating sealing film 4 on the outer surface of the bottom shell 2, and attention is paid to the fact that the first avoiding hole 41 cannot penetrate through the bottom plate 21.

The shell is made of a metal plastic film piece, the hardness of the shell is high, the appearance form of the whole bean type battery can be guaranteed to be unchanged, and the situation that the shell deforms due to the fact that the bean type battery is inflated can be effectively prevented.

The bottom case 2 and the cap 3 may be a single metal or an alloy material. In the present embodiment, both the bottom case 2 and the cap 3 are stainless steel. In addition, under the premise of ensuring the mechanical strength, metal foil materials can be further adopted, such as: steel foil, and thus, the weight of the battery can be further reduced.

The size of the bean cell is small, for example: the diameter is 10mm-13mm, the height is 3mm-6mm, correspondingly, the thickness of the first insulating sealing film 4 and the second insulating sealing film 5 needs to be 0.02mm-0.06mm, the insulating sealing films are directly adhered to metal parts in an outsourcing factory to form metal plastic film parts, after metal plastic film parts are purchased, the metal plastic film parts are cut, stamped and the like to form a shell, the inner surface and the outer surface of the bottom shell 2 and the outer surface of the cover cap 3 need to be clearly distinguished during stamping, so that the first insulating sealing film 4 on the bottom shell 2 after manufacturing and forming is ensured to be located on the outer surface of the bottom shell 2, and the second insulating sealing film 5 on the cover cap 3 is located on the inner surface of the cover cap 3. In other embodiments, the manufactured shell can be purchased directly, that is, when the bottom shell 2 and the cap 3 are purchased back to be finished products, the shape is already formed, and the insulating sealing film is pasted at the corresponding position.

The first insulating sealing film 4 and the second insulating sealing film 5 are both CPP films, PPA films, modified PP films, or composite film layers of PPA and PP.

Compared with other films such as LLDPE, LDPE, HDPE, PET, PVG and the like, the CPP film (namely the casting polypropylene film) has the advantages of lower cost, higher yield, higher stiffness than the PE film, excellent moisture and peculiar smell barrier property, can be used as a base film of a composite material, and can be subjected to metallization treatment.

The PPA film (i.e., polyphthalamide film) is a semi-aromatic polyamide made from terephthalic acid or phthalic acid, and PPA has a semi-crystalline state and a non-crystalline state, has a glass transition temperature of about 255 ℃, and is excellent in heat resistance. In addition, PPA also has better chemical resistance, relatively lower moisture absorption rate, and is stronger and harder than fatty polyamides such as nylon and the like.

Polypropylene (PP) is a semi-crystalline thermoplastic plastic with high impact resistance, high mechanical properties and resistance to corrosion by various organic solvents and acids and bases.

The modified PP film, namely the modified polypropylene film, is also called as a calcium plastic film, has good dimensional stability, low price, higher rigidity, heat resistance and the like compared with pure PP to a certain extent.

As shown in fig. 1 and fig. 2, in this embodiment, the first arc portion 23 is annularly disposed on the first surrounding wall 22, and correspondingly, the second arc portion 33 is also annularly disposed on the second surrounding wall 32, so that the annular arc portion can ensure a good sealing effect, effectively prevent liquid leakage, reduce manufacturing difficulty, and improve production efficiency.

In other embodiments, the arc-shaped portions are not limited to be arranged in an integral annular structure, and each arc-shaped portion may be arranged in an annular interval structure, where the first arc-shaped portion 23 includes a plurality of sub-arc-shaped portions arranged at intervals in the circumferential direction of the first surrounding wall 22, the positions of the sub-arc-shaped portions of two adjacent first arc-shaped portions 23 correspond to each other one by one, correspondingly, the second arc-shaped portion 33 also includes a plurality of sub-arc-shaped portions arranged at intervals in the circumferential direction of the second surrounding wall 32, and the positions of the sub-arc-shaped portions of two adjacent second arc-shaped portions 33 correspond to each other one by one, so that the positions of the first arc-shaped portions 23 and the second arc-shaped portions 33 can be correspondingly fitted.

The sub-arc parts of each first arc part 23 are symmetrically arranged along the central axis of the winding type battery cell 1, and the positions of the sub-arc parts of two adjacent first arc parts 23 are in one-to-one correspondence.

The one-to-one setting means that: in a top view, the sub-arc portions of the uppermost first arc portion 23 completely block the sub-arc portions of the remaining first arc portions 23. Further, a plurality of the first arc-shaped portions 23 may be spirally wound around the first wall 22 in the axial direction of the first wall 22, and correspondingly, a plurality of the second arc-shaped portions 33 may be spirally wound around the second wall 32 in the axial direction of the second wall 32. The spiral winding structure can lead the cap 3 to be screwed on the bottom shell 2, so that the sealing performance is stronger, the abrasion to the sealing layer can be reduced by utilizing the spiral installation, and the service life of the sealing layer is effectively prolonged.

In the present embodiment, the first arc portion 23 is formed by punching or rolling the first surrounding wall 22, and the second arc portion 33 is formed by punching or rolling the second surrounding wall 32. Punching press or roll-in shaping arc portion not only can reduce the manufacturing degree of difficulty, forms the recess that corresponds at the protruding dorsal part of establishing of arc portion, utilizes this recess to hold the arc portion rather than the laminating, realizes closely cooperating.

In a specific embodiment of the present invention, as shown in fig. 1 and 2, all of the first arc-shaped portions 23 are disposed to protrude toward the center of the first wall 22, and all of the second arc-shaped portions 33 are disposed to protrude toward the center of the second wall 32.

In another specific embodiment of the present invention, as shown in fig. 3 and 4, all of the first arc-shaped portions 23 are disposed to protrude toward the center of the first surrounding wall 22, and all of the second arc-shaped portions 33 are disposed to protrude toward the center of the second surrounding wall 32.

In another specific embodiment of the present invention, as shown in fig. 5 and 6, the protruding directions of two adjacent first arc-shaped portions 23 on the first wall 22 are opposite, a plurality of first arc-shaped portions 23 form a first wave-shaped structure on the first wall 22, and a plurality of second arc-shaped portions 33 on the second wall 32 form a second wave-shaped structure matching with the first wave-shaped structure. The wave-shaped structure can make the first surrounding wall 22 and the second surrounding wall 32 fit tightly, and the sealing performance is better.

In order to ensure that the bean type battery is not deformed during assembling and edge sealing, the hardness of the first surrounding wall 22 is set to be greater than that of the second surrounding wall 32, the first surrounding wall 22 has greater hardness, and can be used as a supporting substrate, and the deformation of the first surrounding wall 22 (namely the bottom case 2) or the deformation of the first surrounding wall 22 is far less than that of the second surrounding wall 32 in the steps of assembling a sealing layer, the cap 3, sealing the cap 3 and the like, so that the appearance shape and the sealing of the bean type battery are ensured not to fail.

In one embodiment, as shown in fig. 7, a necking portion 34 is formed at an end of the second wall 32 away from the top plate 31, and an end of the necking portion 34 abuts against an outer wall of the first wall 22. The provision of the notch portion 34 can effectively prevent the cap 3 from being detached from the bottom case 2, and can further improve the sealability between the bottom case 2 and the cap 3.

Of course, the end of the necking portion 34 is not limited to abut against the outer wall of the first surrounding wall 22, and as shown in fig. 1 and 2, the second surrounding wall 32 of the cap 3 may be set long enough to extend to the side of the bottom plate 21 away from the first surrounding wall 22 after the cap 3 is assembled on the bottom shell 2, and then the necking portion 34 of the second surrounding wall 32 is subjected to necking, in which the necking portion 34 abuts against the outer wall of the bottom plate 21.

Alternatively, instead of forming the notch 34, as shown in fig. 1, 3 and 5, the end of the second wall 32 may be directly abutted against the outer wall of the first wall 22.

The winding type battery cell 1 can be in a cylindrical shape, a square column shape, an elliptic column shape and the like.

The winding type battery cell 1 comprises a pole piece 12, a diaphragm 13 and a pole lug 11, wherein the pole piece 12 comprises a positive pole piece 121 and a negative pole piece 122, the pole lug 11 comprises a positive pole lug 111 and a negative pole lug 112, the positive pole lug 111 is connected with the positive pole piece 121, the negative pole lug 112 is connected with the negative pole piece 122, and the positive pole piece 121, the diaphragm 13 and the negative pole piece 122 are sequentially overlapped and then wound to form the winding type battery cell 1.

The positive tab 111 and the negative tab 112 of the winding type battery cell 1 are respectively led out from two ends of the winding type battery cell 1, wherein the positive tab 111 is welded with the cap 3, and the negative tab 112 is welded with the bottom case 2. The positive tab 111 is not limited to be led out from the upper end of the winding type cell 1, and the negative tab 112 is led out from the lower end of the winding type cell 1, but the leading positions of the positive tab 111 and the negative tab 112 may be interchanged, that is, the positive tab 111 is led out from the lower end of the winding type cell 1 to be welded with the bottom case 2, and the negative tab 112 is led out from the upper end of the winding type cell 1 to be welded with the cap 3.

In this embodiment, referring to fig. 1 and 12, only one positive tab 111 is disposed on the positive tab 121, only one negative tab 112 is disposed on the negative tab 122, the positive tab 111 is located at the center of the positive tab 121 in the length direction and extends toward the upper side of the winding type battery cell 1 to be connected to the cap 3, and the negative tab 112 is located at the center of the negative tab 122 in the length direction and extends toward the lower side of the winding type battery cell 1 to be connected to the bottom case 2.

Of course, the number of the tabs 11 on the pole piece 12 is not limited to one, and may be two or more, and as shown in fig. 13, when two or more tabs 11 are provided on the pole piece 12, all the tabs 11 are provided at intervals along the longitudinal direction of the pole piece 12, one tab 11 is provided at the central position in the longitudinal direction of the pole piece 12, and the remaining tabs 11 are provided at intervals on one side or both sides of this tab 11. As shown in fig. 9, taking five tabs 11 provided on each pole piece 12 as an example, one tab 11 is provided at the center of the pole piece 12 in the length direction, and the remaining four tabs 11 are provided two by two symmetrically along the center of the pole piece 12 in the length direction.

In other embodiments, if at least two tabs 11 are provided on the pole piece 12, the tabs 11 may also be provided at the ends of the pole piece 12 in the longitudinal direction.

Alternatively, the pole pieces 12 are provided with the tabs 11 in both the length direction and the width direction, as shown in fig. 10 and 11, one tab 11 is provided in the length direction and one tab 11 is also provided in the width direction of the pole piece 12, and the tab 11 provided in the width direction of the pole piece 12 extends along the radial direction of the winding type battery cell 1.

As shown in fig. 10 and fig. 11, when the tab 11 is disposed in the width direction of the pole piece 12, the current collector has an extension portion 14 extending to the outside of the active material along the radial direction of the winding type battery cell 1, the extension portion 14 is folded and then partially overlapped, the extension portion 14 is disposed at an angle with the pole piece 12, and the extension portion 14 forms the tab 11. Extension 14 through the mass flow body with pole piece 12 extends to the outside of active material and directly forms utmost point ear 11 after buckling, has saved utmost point ear 11 welded process, has promoted production efficiency, has reduced the internal resistance of coiling formula electricity core 1, and integrated into one piece's utmost point ear 11 and pole piece 12 intensity are higher simultaneously, are difficult for breaking away from.

When the tab 11 is disposed in the length direction of the pole piece 12, the tab 11 does not need to be bent, and can be directly led out of the winding type battery cell 1, as shown in fig. 10 or fig. 11, the current collector has an extension portion 14 extending to the outside of the active material along the axial direction of the winding type battery cell 1, the extension portion 14 does not need to be bent to directly form the tab 11, specifically, the extension portion 14 is disposed in the length direction of the long-strip-shaped positive pole piece 121 or negative pole piece 122, when winding along the length direction of the long-strip-shaped positive pole piece 121 or negative pole piece 122, the extension portion 14 is directly formed at both ends of the axial direction of the winding type battery cell 1, and then the extension portion 14 of the positive pole piece 121 is made into the positive tab 111, and the extension portion 14 of the negative pole.

Preferably, as shown in fig. 10 and 11, the overlapped position of the extension 14 is provided with a reinforcement 15. Through set up extra reinforcement 15 in extension 14's coincide position, reinforcement 15 can strengthen the intensity of folding coincide position, is prevented effectively that extension 14 from being broken after bending, protects the integrality of utmost point ear 11, has also strengthened the bulk strength of utmost point ear 11 simultaneously.

The bending angle of the extension portion 14 is flexibly adjusted according to the requirement of the winding type battery cell 1 during packaging, specifically, the extension portion 14 is bent by taking the position connected with the end of the pole piece 12 as a pivot, and is bent by a first included angle α, wherein the first included angle α is 90 °, so that the extension portion 14 can be conveniently led out from the two ends of the winding type battery cell 1, the length of the tab 11 is shortened, and the manufacturing cost is reduced. Of course, the bending angle of the extending portion 14 is not limited to 90 °, and the first included angle α may be set to 30 °, 45 °, 100 °, or 120 ° as required.

In a preferred embodiment of the present invention, as shown in fig. 10, the reinforcement member 15 is an adhesive tape wrapped on the outside of the overlapping position of the extension portion 14. Set up the reinforcement 15 into the sticky tape, on the one hand can cushion extension 14 in the coincide position after buckling, can slow down the stress of extension 14 in the department of buckling to a certain extent, effectively reduce the fracture of extension 14 in the coincide position and lead to the phenomenon that utmost point ear 11 and pole piece 12 separate, on the other hand, utilize the sticky tape to play the effect of protection and design to the structure of the coincide position of extension 14, prevent utmost point ear 11 after long-time use, extension 14 takes place to warp and influence the normal use of coiling formula electricity core 1 in the coincide position after buckling. To further enhance the protective effect of the tape on extension 14, multiple layers of tape may be wrapped in an overlapping position.

In another preferred embodiment of the present invention, as shown in fig. 11, the reinforcing member 15 is a double-sided adhesive tape, the extending portion 14 is provided with a first laminating surface and a second laminating surface which are attached to each other and located at the laminating position, and the double-sided adhesive tape is disposed between the first laminating surface and the second laminating surface. The setting of double faced adhesive tape can prevent effectively that first coincide face and second coincide face from separating to avoid utmost point ear 11 to occupy the space between drain pan 2 and the lid 3.

In addition, the extension part 14 can be bent for multiple times at the same position, so that the thickness of the superposed position is increased, and the strength of the pole piece 12 is further improved.

Certainly, the tab 11 is not limited to be integrally formed with the current collector of the pole piece 12, but may be formed separately, an empty foil area is formed at a reserved position on the current collector of the pole piece 12 without coating an active material, one end of the tab 11 is welded with the empty foil area, and the other end is welded with the bottom case 2 or the cap 3.

Preferably, the plurality of positive electrode tabs 111 or negative electrode tabs 112 may be gathered and then welded to the bottom case 2 or the cap 3.

In one embodiment, as shown in fig. 8, the separator 13 has a separation part 131 extending to both ends of the negative electrode sheet 122 along the axial direction of the winding type cell 1, and the separation part 131 is used to separate the tab 11 of the winding type cell 1 from the end surface of the winding type cell 1. The setting of isolation 131 can prevent effectively that utmost point ear 11 from taking place the electrical contact with the both ends of the vertical direction of coiling formula electricity core 1, and this isolation 131 and coiling formula electricity core 1 structure as an organic whole need not to set up insulating gasket in addition on the terminal surface of coiling formula electricity core 1, has reduced beans formula battery's the preparation degree of difficulty and cost, has promoted production efficiency, need not to change current beans formula battery's preparation technology and equipment simultaneously, is favorable to beans formula battery's large-scale production, and insulating nature is good.

In this embodiment, the length of the isolation portion 131 extending beyond the end face of the winding type battery cell 1 is not less than 0.75 mm. The design can ensure that the end face of the winding type battery cell 1 formed after the positive plate 121, the negative plate 122 and the diaphragm 13 are wound has the isolating part 131 with enough length so as to insulate and isolate the tab 11 and ensure the insulation effect.

Of course, the isolating part 131 is not limited to be provided to isolate the tab 11 from the end surface of the winding type cell 1, and additional insulating sheets may be provided at the two ends of the winding type cell 1 to isolate the tab 11 from the end surface of the winding type cell 1.

In general, the current collector of the positive electrode tab 121 is an aluminum foil, and the current collector of the negative electrode tab 122 is a copper foil, so the material of the positive electrode tab 111 is an aluminum foil, and the material of the negative electrode tab 112 is a copper foil. The aluminum foil and the copper foil are both softer than an aluminum sheet (tape) or a nickel sheet (tape) which is a material of the conventional tab 11, so that the separator 131 is not easily pierced by the tab 11 when being attached to the end surface of the winding type cell 1.

In order to further improve the safety of the bean cell, a separator 13 having high temperature resistance (130-: an aramid fiber membrane 13.

As shown in fig. 9, the bean type battery further includes an auxiliary member 6, where the auxiliary member 6 is a cylindrical structure with two open ends, and has a first end and a second end that are oppositely arranged, one end of the winding type battery cell 1, which is far away from the bottom plate 21, is inserted into the first end, and the second end is located above the winding type battery cell 1. Through setting up auxiliary member 6 in coiling formula electricity core 1's top, this auxiliary member 6 can store electrolyte temporarily, annotate the liquid operation time, annotate liquid equipment and pour into the inside of auxiliary member 6 with electrolyte, electrolyte enters into coiling formula electricity core 1's gap slowly again to absorbed by coiling formula electricity core 1, can prevent effectively that electrolyte from overflowing, can once only pour into sufficient electrolyte into simultaneously, greatly promoted production efficiency, reduced manufacturing cost.

The first end is connected with the end of the winding type battery core 1 far away from the bottom plate 21, and the design can reduce the occupation of the bottom shell 2 and even the inner space of the shell of the whole bean type battery by the auxiliary part 6 as much as possible. Preferably, the first end of the auxiliary element 6 is connected to the outer periphery of the winding type battery cell 1, so that the space for storing the electrolyte in the auxiliary element 6 can be enlarged, and the connection between the auxiliary element 6 and the winding type battery cell 1 is facilitated.

Preferably, the auxiliary member 6 is a cylinder structure, that is, the size of the first end is equal to the size of the second end, and this design can make the diameters of the inner cavity of the auxiliary member 6 consistent everywhere, and during liquid injection, the pressure of the electrolyte in the inner cavity directly acts on the end of the winding type battery cell 1, so that the pressure of the electrolyte in the inner cavity to the winding type battery cell 1 is increased, the absorption of the winding type battery cell 1 to the electrolyte is more facilitated, and the production efficiency of the bean type battery is improved. Of course, in other embodiments, the auxiliary member 6 may also be set to be a horn structure, and the size of the first end is smaller than that of the second end, so that the electrolyte injection can be facilitated by the design, and the precision requirement on the electrolyte injection device is reduced.

In order to provide reference for the injection amount of the electrolyte in the auxiliary part 6, a liquid level height line is arranged in an inner cavity of the auxiliary part 6, the specific height of the electrolyte needing to be temporarily stored in the inner cavity can be calculated before the electrolyte is injected, and then in the actual electrolyte injection process, the electrolyte can be accurately injected only by controlling the electrolyte on the height, so that the accurate control of the injection amount of the electrolyte is facilitated.

In the present embodiment, the auxiliary 6 is formed by winding a tape, and the first end of the auxiliary 6 is attached to the outer peripheral portion of the wound battery cell 1. Because the adhesive tape is thinner and has certain design effect, with adhesive tape wound into auxiliary member 6, annotating the liquid and accomplish the back, need not dismantle auxiliary member 6 from coiling formula electricity core 1, can directly encapsulate the adhesive tape in the shell that drain pan 2 and block 3 are constituteed, hardly occupy the inner space of shell, be convenient for improve battery energy density, reduce the encapsulation degree of difficulty for bean type battery's production efficiency is high. Specifically, the gummed paper may be made of polypropylene (PP) or polyethylene terephthalate (PET) or Polyimide (PI).

It can also act as a tail-out glue when using gummed paper as auxiliary 6, which can further reduce costs.

In other embodiments, the auxiliary member 6 is not limited to being wound with adhesive tape, and may be wound with other materials that do not affect the performance of the battery, such as the same material as the separator 13.

Or the auxiliary member 6 directly forms an integral structure with the winding type battery cell 1, the size of the diaphragm 13 adjacent to the outer ring can be made large, so that the wound diaphragm 13 forms a circle of structure protruding outward from the end face of the winding type battery cell 1 at the end departing from the bottom plate 21 at the periphery of the winding type battery cell 1, and the structure at least surrounds the periphery of the winding type battery cell 1 by a circle to form the auxiliary member 6. This design makes it possible to dispense with the additional production and installation of the auxiliary element 6, so that the auxiliary element 6 is formed after winding of the wound electrical core 1.

The embodiment of the utility model provides a still provide a manufacturing method of bean-type battery, place coiling type electricity core 1 in drain pan 2, and will coiling type electricity core 1's utmost point ear 11 respectively with drain pan 2 and block 3 welding, then annotate the liquid, will after annotating the liquid block 3 with drain pan 2 equipment is right after the equipment the drain pan 2 with first insulating seal membrane 4 between the block 3 and the solidification of second insulating seal membrane 5 form the one deck sealing layer. The manufacturing method is simple to operate, the step of installing the sealing ring is omitted, the production efficiency is greatly improved, in addition, the thickness consistency of the insulating sealing films on the bottom shell 2 and the cover cap 3 is good, secondary sealing is realized by adopting a curing mode, and the sealing effect is greatly improved.

The first insulating sealing film 4 and the second insulating sealing film 5 are cured by heating or radiation.

The specific preparation method comprises the following steps:

s100, providing a metal piece, and cleaning, drying and passivating the surface of the metal piece;

step S200, adhering an insulating sealing film to one side surface of the metal piece by using an adhesive, and performing hot press molding to form a metal plastic film piece (the metal plastic film piece can also be purchased as a finished product);

step S300, forming a hole in a position corresponding to an insulating sealing film of the metal plastic film piece;

step S400, cutting a metal plastic film piece, and stamping to form a bottom shell 2 and a cap 3, wherein a first insulating sealing film 4 of the bottom shell 2 is positioned on the outer surface of the bottom shell, a second insulating sealing film 5 of the cap 3 is positioned on the inner surface of the bottom shell, a first avoidance hole 41 is formed in the first insulating sealing film 4 of the outer wall of the bottom shell 2, and a second avoidance hole 51 is formed in the second insulating sealing film 5 of the inner wall of the cap 3;

step S500, assembling the winding type battery cell 1 in the bottom case 2, and injecting liquid;

step S600, assembling the bottom shell 2 and the cap 3, heating and fusing the joint of the bottom shell 2 and the cap 3, controlling the heating temperature to be 100-1000 ℃, controlling the heating time to be 1-60S, fusing the first insulating sealing film 4 and the second insulating sealing film 5 into a sealing layer, and enabling no gap to exist between the bottom shell 2 and the cap 3 so as to achieve the effect of complete sealing.

Preferably, the heating temperature may be 150 ℃, 160 ℃, 200 ℃, 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃, 550 ℃, 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃.

Preferably, the heating time may be 2s, 3s, 5s, 8s, 10s, 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55 s.

The forming of dodging the hole is not limited to be set before bottom shell 2 and block 3 stamping forming, can also directly set up well before making metal plastic film spare, is about to insulating seal membrane corresponds the position trompil, pastes the insulating seal membrane after the trompil on the surface of metalwork. Or, after the bottom shell 2 and the cover cap 3 are punched and formed, the avoidance holes are formed at the corresponding positions.

In this embodiment, the thickness of the metal plastic film member is 100 μm to 300 μm.

The adhesive is polyolefin, polyethyleneimine or polyurethane adhesive resin.

In the description herein, it is to be understood that the terms "upper" and the like are used in a descriptive sense and based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, configuration and operation in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description herein, references to the description of "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

Claims

1. The utility model provides a bean type battery, includes the shell and sets up coiling type electricity core in the shell, its characterized in that, the shell includes drain pan and block, the drain pan with the block is the metalwork, the drain pan includes the bottom plate and encircles the first leg of a side of bottom plate, the block includes the roof and encircles the second leg of a side of roof, the second leg cover is established outside the first leg, be provided with first arc portion on the first leg, be provided with on the second leg with first arc portion complex second arc portion, the surface paste of first leg has first insulating seal membrane, the internal surface paste of second leg has second insulating seal membrane, first insulating seal membrane with solidify as an organic whole after the second insulating seal membrane butt sealing layer; the pole piece of coiling formula electricity core is rectangular shape, works as when setting up a utmost point ear on the pole piece, utmost point ear sets up the length direction's of pole piece central point puts, works as set up at least two on the pole piece during the utmost point ear, at least one utmost point ear sets up on the length direction of pole piece, set up the length direction of pole piece the length of utmost point ear is followed the axis direction of coiling formula electricity core extends, utmost point ear extends to the outside of coiling formula electricity core.

2. The bean-type battery according to claim 1, wherein the first wall is provided with a plurality of consecutive first arc-shaped portions along an axial direction thereof, and the second wall is provided with a plurality of second arc-shaped portions along an axial direction thereof, the second arc-shaped portions being engaged with the first arc-shaped portions.

3. The bean type battery according to claim 1, characterized in that, the surface of drain pan all sets up first insulating seal membrane, the bottom plate surface be provided with first dodge hole on the first insulating seal membrane, the internal surface of block all sets up the second insulating seal membrane, the roof internal surface be provided with the second on the second insulating seal membrane and dodge the hole, utmost point ear includes positive ear and negative pole ear, positive ear with one of the negative pole ear passes the second dodge the hole with roof internal surface welds, another in positive ear and the negative pole ear with the internal surface welds of bottom plate.

4. The bean-type battery according to claim 2, wherein the first arc-shaped part is annularly arranged on the first surrounding wall, and a plurality of the first arc-shaped parts are parallel along the axial direction of the first surrounding wall; or the like, or, alternatively,

5. The bean battery of claim 2, wherein all of the first arc-shaped portions are convexly disposed toward a center of the first surrounding wall, and all of the second arc-shaped portions are convexly disposed toward a center of the second surrounding wall; or the like, or, alternatively,

6. The prismatic battery according to claim 1, wherein when at least two tabs are provided on said pole piece, all of said tabs are provided at intervals along a length direction of said pole piece.

7. The bean cell of claim 6, wherein one of the tabs is located at a center of the pole piece in a length direction, and the remaining tabs are spaced apart from the tabs located at the center of the pole piece in the length direction.

8. The bean cell of claim 7, wherein at least three and a single number of said tabs are disposed on said pole piece, one of said tabs being located at a center of said pole piece in a length direction, and the remaining tabs being symmetrically disposed with respect to the center of said pole piece in the length direction.

9. The bean type battery according to claim 1, wherein when at least two tabs are provided on the pole piece, the tabs are provided in both the length direction and the width direction of the pole piece, and the tabs provided in the width direction of the pole piece extend in the radial direction of the wound battery cell.

10. The bean type battery of claim 9, wherein the pole piece comprises a current collector and an active material coated on the current collector, the current collector has an extension portion extending to the outside of the active material along the radial direction of the wound battery cell, the extension portion is folded, the extension portion and the pole piece are arranged at an included angle, and the extension portion forms the tab located in the width direction of the pole piece.

11. The bean battery of claim 1, wherein the wound cell comprises a positive plate, a negative plate, and a separator disposed between the positive plate and the negative plate;

12. The bean type battery as claimed in claim 1, wherein a necking part is formed at one end of the second surrounding wall far away from the top plate, and the end part of the necking part abuts against the outer wall of the first surrounding wall or the outer wall of the bottom plate; or the like, or, alternatively,

one end of the second surrounding wall, which is far away from the top plate, is abutted against the outer wall of the first surrounding wall.

13. The bean battery of claim 1, further comprising an auxiliary member in a two-end open barrel structure having a first end and a second end opposite to each other, wherein the end of the wound cell away from the bottom plate is inserted into the first end, and the second end is located above the wound cell.

14. The bean-type battery according to claim 1, wherein the insulating sealing film is any one of a CPP film, a PPA film, a modified PP film, and a composite film layer of PPA and PP.