CN211017130U

CN211017130U - Winding type bean type battery

Info

Publication number: CN211017130U
Application number: CN201922262518.3U
Authority: CN
Inventors: 冯彪; 葛辉明; 袁中直; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-07-14
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a coiled bean type battery, which comprises a bottom shell, a cover cap and an auxiliary component, wherein a space for accommodating a coiled electric core is formed between the bottom shell and the cover cap, one electrode lug of the coiled electric core is connected with the cover cap, the other electrode lug is connected with the bottom shell, the bottom shell comprises a bottom plate and a first wall arranged on one side surface of the bottom plate, the cover cap comprises a top plate and a second wall arranged on one side surface of the top plate, the second wall is sleeved outside the first wall, a plurality of continuous first arc-shaped parts are arranged on the first wall along the axial direction of the first wall, a plurality of second arc-shaped parts matched with the first arc-shaped parts are arranged on the second wall along the axial direction of the second wall, a sealing component is clamped between the first wall and the second wall, and the auxiliary component is a barrel structure, the winding type battery cell comprises a base plate, a winding type battery cell and a winding type battery cell, wherein the winding type battery cell is provided with a first end and a second end which are oppositely arranged, one end of the winding type battery cell, which is far away from the base plate, is inserted into the first end, and the second end is positioned above the winding type battery cell. The utility model discloses a coiling formula beans formula battery simple structure, it is sealed effectual, annotate liquid efficient.

Description

Winding type bean type battery

Technical Field

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

Background

The button cell is also called button cell, and refers to a cell with the external dimension like a small button. Button cell generally includes drain pan, block and sets up the electric core in the holding intracavity that the two constitute, because button cell's size is very little, causes its sealed degree of difficulty very big. The assembly process of the button 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. Although the existing button battery contains the sealing ring, the sealing effect of the existing button battery is still general, the leakage of the battery is easily caused, the service life of the button battery is influenced, and the sealing ring is also easily damaged when being sealed, so that the sealing failure is caused.

In addition, in order to inject more electrolyte into the battery, manufacturers of the battery generally adopt a multi-injection mode, that is, a part of electrolyte is injected into the battery, and the battery is vacuumized or directly waits for the electrolyte to be absorbed into the winding type battery core, and then another part of electrolyte is injected into the winding type battery core after the casing vacates a certain space. The liquid injection mode has low efficiency, long operation time and high precision requirement on liquid injection equipment.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the utility model provides a coiling formula beans formula battery, its simple structure, sealed effectual.

The embodiment of the utility model provides a another aim at: provided is a wound bean battery having high liquid injection efficiency.

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

the utility model provides a coiled bean type battery, including drain pan and block, form the space that holds coiled electric core between the drain pan and the block, one utmost point ear of coiled electric core is connected with the block, another utmost point ear is connected with the drain pan, the drain pan includes bottom plate and the first leg that encircles a side of bottom plate, the block includes roof and the second leg that encircles a side of the roof, the second leg cover is established outside the first leg, be provided with a plurality of continuous first arc portions along its axial direction on the first leg, be provided with a plurality of second arc portions that cooperate with the first arc portion on the second leg along its axial direction, press from both sides and be equipped with the sealing member between first leg and the second leg;

still include the auxiliary member, the auxiliary member is both ends open-ended tubular structure, and it has relative first end and the second end that sets up, the coiling formula electricity core is kept away from the one end of bottom plate is inserted in the first end, the second end is located the top of coiling formula electricity core.

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

As a preferable mode of the rolled-up bean-type battery, all of the first arc-shaped portions are arranged to protrude toward the center of the first surrounding wall, and all of the second arc-shaped portions 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 mode of the wound-type bean-shaped 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 wound-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.

As a preferable mode of the wound bean battery, the first peripheral wall has a hardness greater than that of the second peripheral wall.

As a preferable scheme of the winding 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 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; or the like, or, alternatively,

and one end, far away from the top plate, of the second surrounding wall is provided with a curled edge structure, and the curled edge structure is abutted against the outer wall of the first surrounding wall.

As a preferable scheme of the wound bean battery, the sealing element includes a sealing body sandwiched between the first surrounding wall and the second surrounding wall, one end of the sealing body close to the top plate extends toward the center of the sealing body to form a first extending portion, one end of the first extending portion away from the sealing body extends toward the bottom plate to form a second extending portion, and the second extending portion is tightly attached to the inner wall of the first surrounding wall.

As a preferable mode of the wound bean type battery, the bottom case and the cap are made of a metal material.

As a preferred scheme of coiling formula beans formula battery, the pole piece of coiling formula electricity core includes the mass flow body and the 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 and is partly coincide, the extension with the pole piece is the contained angle setting, the extension is buckled and is formed utmost point ear.

As a preferable scheme of the winding type bean battery, the winding type battery cell includes a positive plate, a negative plate and a diaphragm disposed between the positive plate and the negative plate, the diaphragm has an isolation portion extending to both ends of the negative plate along an axis direction of the winding type battery cell, and the isolation portion is used for isolating the tab from an end face of the winding type battery cell.

The utility model discloses beneficial effect does: the corresponding arc-shaped parts are arranged on the first surrounding wall and the second surrounding wall, the sealing element can be tightly pressed between the first surrounding wall and the second surrounding wall due to the arrangement of the arc-shaped parts, the sealing property between the bottom shell and the cap is obviously improved, the sealing element can be protected due to the arrangement of the arc-shaped parts, the sealing element is prevented from being damaged when the cap is sealed, the service life of the sealing element is prolonged, and meanwhile, the sealing between the bottom shell and the cap is ensured not to lose efficacy; set up the auxiliary member through the top at coiling formula electricity core, this auxiliary member can store electrolyte temporarily, when annotating the liquid operation, annotate liquid equipment and pour into the inside of auxiliary member with electrolyte, during electrolyte enters into the gap of coiling formula electricity core slowly again to absorbed by coiling formula electricity core, can prevent effectively that electrolyte from excessive, the shaping is once injected to electrolyte simultaneously, has greatly promoted production efficiency, has reduced manufacturing cost.

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 wound bean battery according to an embodiment of the present invention.

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

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

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

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

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

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

Fig. 8 is a schematic cross-sectional view of the assembled winding type battery cell and the auxiliary member according to an embodiment of the present invention.

Fig. 9 is a schematic structural view of a pole piece and a tab according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of a pole piece and a tab according to another embodiment of the present invention.

In the figure:

1. a bottom case; 11. a base plate; 12. a first enclosure wall; 13. a first arcuate portion;

2. capping; 21. a top plate; 22. a second enclosure wall; 23. a second arcuate portion; 24. a crimping structure;

3. a winding type battery cell; 31. a tab; 311. a positive tab; 312. a negative tab; 32. an extension portion; 321. a superimposed position; 33. a reinforcement; 34. pole pieces; 341. a positive plate; 342. a negative plate; 35. a diaphragm; 351. an isolation section;

4. a seal member; 41. a seal body; 42. a first extension portion; 43. a second extension portion;

5. 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 to 6, the wound bean-type battery of the present invention includes a bottom case 1, a cap 2 and an auxiliary member 5, a space for accommodating a wound electric core 3 is formed between the bottom case 1 and the cap 2, one tab 31 of the wound electric core 3 is connected to the cap 2, the other tab 31 is connected to the bottom case 1, the bottom case 1 includes a bottom plate 11 and a first wall 12 annularly disposed on one side of the bottom plate 11, the cap 2 includes a top plate 21 and a second wall 22 annularly disposed on one side of the top plate 21, the second wall 22 is sleeved outside the first wall 12, the first wall 12 is provided with a plurality of continuous first arc portions 13 along an axial direction thereof, the second wall 22 is provided with a plurality of second arc portions 23 along an axial direction thereof, the second wall is matched with the first arc portions 13, and a sealing member 4 is sandwiched between the first wall 12 and the second wall 22, the auxiliary part 5 is a cylinder structure with openings at two ends, and has a first end and a second end which are arranged oppositely, one end of the winding type battery cell 3, which is far away from the bottom plate 11, is inserted into the first end, and the second end is located above the winding type battery cell 3. The first surrounding wall 12 and the second surrounding wall 22 are provided with corresponding arc-shaped parts, the sealing element 4 can be pressed between the first surrounding wall 12 and the second surrounding wall 22 through the arc-shaped parts, and a long sealing reinforcing area can be formed in a limited space (the bean type battery has a small size, such as a diameter of 10mm-13mm and a height of 3mm-6mm) by utilizing the arc-shaped parts arranged in a protruding mode, so that the sealing property between the bottom case 1 and the cap 2 is effectively improved, the contact position of the arc-shaped parts and the sealing element 4 is an arc surface, the sealing element 4 can be effectively prevented from contacting with a sharp part, the sealing element 4 is further prevented from being damaged when the cap 2 is sealed, the service life of the sealing element 4 is prolonged, and meanwhile, the sealing between the bottom case 1 and the cap 2 is prevented from failing; set up auxiliary member 5 through the top at coiling formula electricity core 3, electrolyte can be stored temporarily to this auxiliary member 5, when annotating the liquid operation, annotate liquid equipment and pour into the inside of auxiliary member 5 with electrolyte, electrolyte enters into coiling formula electricity core 3's gap slowly again to absorbed by coiling formula electricity core 3, can prevent effectively that electrolyte from overflowing, can once only pour into sufficient electrolyte into simultaneously, greatly promoted production efficiency, reduced manufacturing cost.

As shown in fig. 1 and fig. 2, in this embodiment, the first arc-shaped portion 13 is annularly disposed on the first surrounding wall 12, and correspondingly, the second arc-shaped portion 23 is also annularly disposed on the second surrounding wall 22, so that the annular arc-shaped portion not only can ensure a good sealing effect, effectively prevents liquid leakage, but also can reduce the manufacturing difficulty, and improve the production efficiency, and in addition, the arc-shaped portion of this structure has no space along the first surrounding wall 12 or the second surrounding wall 22, thereby further enhancing the sealing effect.

In other embodiments, the arc-shaped portions are not limited to be arranged in an integral annular structure, and each arc-shaped portion may also be arranged in an annular interval structure, where the first arc-shaped portion 13 includes a plurality of sub-arc-shaped portions arranged at intervals in the circumferential direction of the first surrounding wall 12, the positions of the sub-arc-shaped portions of two adjacent first arc-shaped portions 13 correspond to each other one by one, correspondingly, the second arc-shaped portion 23 also includes a plurality of sub-arc-shaped portions arranged at intervals in the circumferential direction of the second surrounding wall 22, and the positions of the sub-arc-shaped portions of two adjacent second arc-shaped portions 23 correspond to each other one by one, so that the positions of the first arc-shaped portion 13 and the second arc-shaped portion 23 can be correspondingly fitted.

The sub-arc parts of each first arc part 13 are symmetrically arranged along the central axis of the winding type battery cell 3, and the positions of the sub-arc parts of two adjacent first arc parts 13 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 13 completely block the sub-arc portions of the remaining first arc portions 13. Further, a plurality of the first arc-shaped portions 13 may be spirally wound around the first wall 12 in the axial direction of the first wall 12, and correspondingly, a plurality of the second arc-shaped portions 23 may be spirally wound around the second wall 22 in the axial direction of the second wall 22. The spiral winding structure can lead the cap 2 to be screwed on the bottom shell 1, so that the sealing performance is stronger, the abrasion to the sealing element 4 can be reduced by utilizing the spiral mode installation, and the service life of the sealing element 4 is effectively prolonged.

In the present embodiment, the first arc-shaped portion 13 is formed by punching or rolling the first surrounding wall 12, and the second arc-shaped portion 23 is formed by punching or rolling the second surrounding wall 22. 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 13 are disposed toward the center of the first wall 12, and all of the second arc-shaped portions 23 are disposed toward the center of the second wall 22.

In another specific embodiment of the present invention, as shown in fig. 3 and 4, all of the first arc-shaped portions 13 are disposed to protrude toward the center of the first surrounding wall 12, and all of the second arc-shaped portions 23 are disposed to protrude toward the center of the second surrounding wall 22.

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 13 on the first wall 12 are opposite, a plurality of first arc-shaped portions 13 form a first wave-shaped structure on the first wall 12, and a plurality of second arc-shaped portions 23 on the second wall 22 form a second wave-shaped structure matching with the first wave-shaped structure. The wave-shaped structure can make the first surrounding wall 12 and the second surrounding wall 22 fit more tightly, and the sealing performance is better.

In order to ensure that the winding type bean battery is not deformed during assembling and edge sealing, the hardness of the first surrounding wall 12 is set to be greater than that of the second surrounding wall 22, the hardness of the first surrounding wall 12 is greater, and the first surrounding wall 12 can be used as a supporting base body, so that the deformation of the first surrounding wall 12 (namely the bottom case 1) or the deformation of the first surrounding wall 12 is far less than that of the second surrounding wall 22 in the steps of assembling the sealing element 4, the cap 2, sealing the cap 2 and the like, and the appearance and the sealing of the winding type bean battery are ensured not to fail.

In an embodiment, as shown in fig. 1 and 2, the first end is connected to an end of the winding type battery cell 3 away from the bottom plate 11, and this design can make the auxiliary member 5 occupy as little space as possible inside the casing 1, even the entire winding type bean battery casing. Preferably, the first end of the auxiliary member 5 is connected to the outer periphery of the winding type battery cell 3, so that the space for storing the electrolyte in the auxiliary member 5 can be enlarged, and the connection between the auxiliary member 5 and the winding type battery cell 3 is facilitated.

Preferably, the auxiliary member 5 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 5 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 3, so that the pressure of the electrolyte in the inner cavity on the winding type battery cell 3 is increased, the absorption of the winding type battery cell 3 on the electrolyte is more facilitated, and the production efficiency of the winding type bean type battery is improved. Of course, in other embodiments, the auxiliary member 5 may 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, 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 5, a liquid level height line is arranged in an inner cavity of the auxiliary part 5, 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 5 is formed by winding a tape, and the first end of the auxiliary 5 is attached to the outer peripheral portion of the winding type cell 3. Because the adhesive tape is thinner and has certain design effect, with adhesive tape wound into auxiliary member 5, annotating the liquid and accomplish the back, need not dismantle auxiliary member 5 from coiling formula electricity core 3, can directly encapsulate the adhesive tape in the casing that drain pan 1 and block 2 are constituteed, do not occupy the inner space of casing hardly, be convenient for improve battery energy density, reduce the encapsulation degree of difficulty for the production efficiency of coiling formula beans formula battery 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 an auxiliary, which can further reduce costs.

In other embodiments, the auxiliary member 5 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 35.

Or the auxiliary part 5 directly forms an integral structure with the winding type cell 3, the size of the diaphragm 35 adjacent to the outer ring can be made large, so that the wound diaphragm 35 forms a circle of structure protruding outward from the end face of the winding type cell 3 at the end departing from the bottom plate 11 at the periphery of the winding type cell 3, and the structure at least surrounds the periphery of the winding type cell 3 by a circle to form the auxiliary part 5. This design makes it possible to dispense with the additional production and installation of the auxiliary part 5, so that the auxiliary part 5 is formed after the winding of the winding core 3.

In an embodiment, the tabs 31 of the winding cells 3 are all disposed on the outer ring of the winding cells 3.

In other embodiments, the tab 31 may also be directly led out from the central position or a position close to the central position of the winding-type cell 3, the central position of the winding-type cell 3 is a position located at a winding starting end during winding, the winding of the winding-type cell 3 takes this as a winding center, that is, the positive tab 311 is disposed on the positive tab 341 in a position close to the winding center or the central position of the winding-type cell 3, the negative tab 312 is disposed on the negative tab 342 in a position close to the winding center or the central position of the winding-type cell 3, and after the positive tab 341, the negative tab 342 and the separator 35 are stacked, the winding-type cell 3 is formed by winding from one end where the positive tab 311 and the negative tab 312 are disposed. The positive tab 311 and the negative tab 312 are respectively led out from two ends of the winding type cell 3 in the axial direction, specifically, the positive tab 311 is led out from the upper end of the winding type cell 3 to be connected with the cap 2, and the negative tab 312 is led out from the lower end of the winding type cell 3 to be connected with the bottom case 1.

Of course, the positive tab 311 and the negative tab 312 are not limited to being drawn from both ends of the wound cell 3 in the axial direction, and the positive tab 311 and the negative tab 312 may be drawn from the same end of the wound cell 3 in the axial direction.

In addition, a non-end portion of the pole piece 34 of the winding type cell 3 is provided with an empty foil area, the tab 31 is spot-welded or extends out of the empty foil area, and after winding, the tab 31 is led out from two ends of the winding type cell 3 in the axial direction. When one tab 31 is provided on the pole piece 34, the tab 31 is preferably provided at the central position in the longitudinal direction of the pole piece 34, and when a plurality of tabs 31 are provided on the pole piece 34, one tab 31 is preferably provided at the central position in the longitudinal direction of the pole piece 34, and the remaining tabs 31 are provided at intervals from the tab 31 at the central position.

The winding type battery cell 3 can be in a cylindrical shape, a square column shape, an elliptic column shape and the like.

The tabs 31 are not limited to being located at both ends of the winding type cell 3, and may be located at the same end of the winding type cell 3.

In an embodiment, a necking portion is formed at an end of the second wall 22 away from the top plate 21, and an end of the necking portion abuts against an outer wall of the first wall 12. The arrangement of the necking part can effectively prevent the cap 2 from separating from the bottom case 1, and can further improve the sealing property between the bottom case 1 and the cap 2.

Of course, the end of the necking portion is not limited to abut against the outer wall of the first surrounding wall 12, and the second surrounding wall 22 of the cap 2 may be set long enough to extend to the side of the bottom plate 11 away from the first surrounding wall 12 after the cap 2 is assembled on the bottom case 1, and then the necking portion of the second surrounding wall 22 is subjected to necking, and the necking portion abuts against the outer wall of the bottom plate 11.

In addition, the end of the second wall 22 may be directly abutted against the outer wall of the first wall 12 without forming a necking portion, or as shown in fig. 7, the end of the second wall 22 away from the top plate 21 is curled to form a curling structure 24, and the curling structure 24 can also improve the sealing performance between the bottom case 1 and the cap 2.

In an embodiment, as shown in fig. 1 to 6, the sealing element 4 includes a sealing body 41 interposed between the first surrounding wall 12 and the second surrounding wall 22, an end of the sealing body 41 close to the top plate 21 extends toward a center of the sealing body 41 to form a first extending portion 42, an end of the first extending portion 42 away from the sealing body 41 extends toward the bottom plate 11 to form a second extending portion 43, and the second extending portion 43 abuts against an inner wall of the first surrounding wall 12. The sealing body 41 is clamped between the first surrounding wall 12 and the second surrounding wall 22, and the first arc-shaped part 13 and the second arc-shaped part 23 corresponding to each other are arranged on the two surrounding walls, so that the sealing body 41 is extruded to form a plurality of concave-convex structures, and the sealing body 41 is provided with the concave-convex structures, so that the sealing area is increased, the sealing effect is improved, meanwhile, the air tightness of the sealing body 41 with the structure is high, and the liquid leakage phenomenon can be effectively prevented.

Of course, a third arc-shaped portion matched with the first arc-shaped portion 13 and the second arc-shaped portion 23 may be pre-arranged on the sealing element 4, and by arranging the third arc-shaped portion, the sealing element 4 can be attached to the first surrounding wall 12 and the second surrounding wall 22 more tightly, and the sealing performance is better.

In the present embodiment, the third arc-shaped portion is provided on the seal body 41.

In addition, the first extension portion 42 and the second extension portion 43 can cooperate with the sealing body 41 to form a positioning structure for the sealing element 4, when the sealing device is installed, the upper end of the first surrounding wall 12 is clamped between the second extension portion 43 and the sealing body 41, and the first extension portion 42 abuts against the end face of the upper end of the first surrounding wall 12, so as to position the sealing element 4.

The length of the second extension portion 43 in the vertical direction is smaller than the width of the single first arc-shaped portion 13 or the second arc-shaped portion 23 in the vertical direction, so that the size of the second extension portion 43 in the first surrounding wall 12 is shorter, the consumption of materials can be reduced, the manufacturing cost can be reduced, and the basic positioning effect can be ensured.

In one embodiment, the bottom case 1 and the cap 2 are made of metal materials. The rigidity of the bottom shell 1 and the cover cap 2 made of metal materials is high, so that the whole shell of the winding type bean battery is a hard shell, the appearance form of the whole winding type bean battery can be ensured to be unchanged by the hard shell structure, and the situation of shell deformation caused by gas expansion in the battery can be effectively prevented.

The metal material may be a single metal material or an alloy material.

In the present embodiment, the metal material is stainless steel.

In an embodiment, as shown in fig. 1, 9, and 10, the pole piece 34 of the winding type battery cell 3 is divided into a positive pole piece 341 and a negative pole piece 342, the positive pole piece 341 and the negative pole piece 342 are similar in shape, each pole piece 34 includes a current collector and an active material coated on the current collector, the current collector has an extension portion 32 extending to the outside of the active material along the radial direction of the winding type battery cell 3, the extension portion 32 is partially overlapped after being bent, the extension portion 32 and the pole piece 34 form an included angle, and the extension portion 32 forms the tab 31. Extension 32 through the mass flow body with pole piece 34 extends to the outside of active material and directly forms utmost point ear 31 after buckling, has saved utmost point ear 31 welded process, has promoted production efficiency, has reduced the internal resistance of coiling formula electricity core 3, and integrated into one piece's utmost point ear 31 and pole piece 34 intensity are higher simultaneously, are difficult for breaking away from.

Preferably, the folding position 321 of said extension 32 is provided with a reinforcement 33. By arranging the additional reinforcing member 33 at the overlapping position 321 of the extension portion 32, the reinforcing member 33 can reinforce the strength of the overlapping position 321, effectively prevent the extension portion 32 from being broken after being bent, protect the integrity of the tab 31, and simultaneously reinforce the overall strength of the tab 31.

The bending angle of the extension portion 32 can be flexibly adjusted according to the requirement of the winding type battery cell 3 during packaging, specifically, the extension portion 32 is bent by using the position connected with the end of the pole piece 34 as a pivot, and is bent by using a first included angle α, wherein the first included angle α is 90 °, and the angle can enable the extension portion 32 to be conveniently led out from two ends of the winding type battery cell 3, so that the length of the tab 31 is shortened, and the manufacturing cost is reduced.

As shown in fig. 9, in a preferred embodiment of the present invention, the reinforcement 33 wraps the adhesive tape outside the overlapping position 321 of the extension 32. Set up the reinforcement 33 into the sticky tape, on the one hand can cushion extension 32 at the coincide position 321 after buckling, can slow down the stress of extension 32 at the department of buckling to a certain extent, effectively reduce the fracture of extension 32 at coincide position 321 and lead to the phenomenon that utmost point ear 31 and pole piece 34 separate, on the other hand, utilize the sticky tape to play the effect of protection and design to the structure of the coincide position 321 of extension 32, prevent that utmost point ear 31 from taking place to warp and influencing the normal use of winding type electricity core 3 in the coincide position 321 after buckling after long-time use. To further enhance the protective effect of the tape on the extension 32, multiple layers of tape may be wrapped at the laminating station 321.

In another preferred embodiment of the present invention, as shown in fig. 10, the reinforcing member 33 is a double-sided adhesive tape, and the extending portion 32 and the overlapping position 321 are provided with a first overlapping surface and a second overlapping surface which are attached to each other, and the double-sided adhesive tape is disposed between the first overlapping surface and the second overlapping 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 31 to occupy the space between drain pan 1 and the block 2.

In addition, the extension portion 32 can be bent multiple times at the same position, so as to increase the thickness of the overlapping position 321, thereby enhancing the strength of the pole piece 34.

In one embodiment, as shown in fig. 8, a separator 35 is disposed between the positive electrode sheet 341 and the negative electrode sheet 342 of the winding type cell 3, the separator 35 has a separation portion 351 extending to both ends of the negative electrode sheet 342 along the axial direction of the winding type cell 3, and the separation portion 351 is used for separating the tab 31 of the winding type cell 3 from the end surface of the winding type cell 3. The setting of isolation part 351 can effectively prevent that utmost point ear 31 from taking place the electrical contact with the both ends of the vertical direction of coiling formula electricity core 3, need not additionally to set up insulating gasket on the terminal surface of coiling formula electricity core 3, has reduced the preparation degree of difficulty and the cost of coiling formula beans formula battery, has promoted production efficiency, need not to change the preparation technology and the equipment of current battery simultaneously, is favorable to the large-scale production of coiling formula beans formula battery, and insulating nature is good.

In this embodiment, the length of the isolation portion 351 extending beyond the end face of the winding type battery cell 3 is not less than 0.75 mm. The design can ensure that the end face of the winding type battery cell 3 formed after the positive plate 341, the negative plate 342 and the diaphragm 35 are wound has the isolation part 351 with enough length so as to insulate and isolate the pole lug 31 and ensure the insulation effect.

In general, the current collector of the positive electrode sheet 341 is an aluminum foil, and the current collector of the negative electrode sheet 342 is a copper foil, so that the material of the positive electrode tab 311 is an aluminum foil, and the material of the negative electrode tab 312 is a copper foil. The aluminum foil and the copper foil are both softer than the aluminum sheet or the nickel sheet of the conventional tab, so that the isolating part 351 is not easily pierced by the tab 31 when being attached to the end face of the winding type electric core 3.

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

The diameter-height ratio of the wound bean-type battery is more than or equal to 1; preferably > 1.

The wound bean type battery is a rechargeable bean type battery.

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.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. A coiled bean-type battery comprises a bottom shell and a cap, wherein a space for accommodating a coiled electric core is formed between the bottom shell and the cap, one tab of the coiled electric core is connected with the cap, and the other tab of the coiled electric core is connected with the bottom shell;

2. A rolled bean-type battery according to claim 1, wherein the first arc-shaped portion is annularly provided on the first surrounding wall, and a plurality of the first arc-shaped portions are parallel in an axial direction of the first surrounding wall; or the like, or, alternatively,

3. A rolled bean battery according to claim 1, characterized in that the first arc-shaped part is stamped or rolled from the first peripheral wall and the second arc-shaped part is stamped or rolled from the second peripheral wall.

4. A rolled bean battery according to claim 3, characterized in that all the first arc-shaped parts are convexly provided toward the center of the first surrounding wall, and all the second arc-shaped parts are convexly provided toward the center of the second surrounding wall; or the like, or, alternatively,

5. A wound bean-type battery according to claim 1, characterized in that the auxiliary member is formed by winding a gummed paper, and the first end of the auxiliary member is stuck to an outer circumferential portion of the wound electric core; or the like, or, alternatively,

6. A rolled bean battery according to claim 1, characterized in that the first peripheral wall has a hardness greater than the hardness of the second peripheral wall.

7. A rolled bean-type battery according to claim 1, characterized in that a necking part is formed at one end of the second surrounding wall far away from the top plate, and the end 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,

8. A rolled bean-type battery according to claim 1, wherein the sealing member comprises a sealing body sandwiched between the first surrounding wall and the second surrounding wall, one end of the sealing body near the top plate extends to a center of the sealing body to form a first extending portion, one end of the first extending portion far away from the sealing body extends to the bottom plate to form a second extending portion, and the second extending portion abuts against an inner wall of the first surrounding wall.

9. A rolled bean battery according to any one of claims 1 to 8, characterized in that the bottom case and the cap are both made of a metal material.

10. The wound bean battery of any one of claims 1 to 8, wherein the pole piece of the wound battery cell 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 a radial direction of the wound battery cell, the extension portion is partially overlapped after being bent, the extension portion and the pole piece are arranged at an included angle, and the extension portion is bent to form the tab.

11. A wound bean battery according to any one of claims 1 to 8, wherein the wound battery cell comprises a positive electrode sheet, a negative electrode sheet, and a separator provided between the positive electrode sheet and the negative electrode sheet, the separator having a separation part extending to both ends of the negative electrode sheet in an axial direction of the wound battery cell, the separation part being configured to separate the tab from an end face of the wound battery cell.