CN211017140U

CN211017140U - Winding type bean type battery

Info

Publication number: CN211017140U
Application number: CN201922257475.XU
Authority: CN
Inventors: 徐诚; 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 coiling formula beans formula battery, including drain pan and block, form the space that holds coiling formula electricity core between drain pan and the block, a utmost point ear and the block of coiling formula electricity core are connected, another utmost point ear is connected with the drain pan, the drain pan includes the bottom plate and encircles the first leg of establishing in a side of bottom plate, the block includes roof and the second leg that encircles a side of roof, the second leg cover is established outside first leg, be provided with a plurality of continuous first arc portions along its axis direction on the first leg, be provided with a plurality of second arc portions that cooperate with first arc portion along its axis direction on the second leg, it is equipped with the sealing member to press from both sides between first leg and the second leg; the pole piece of the winding type battery cell is in a long strip shape, when one pole lug is arranged on the pole piece, the pole piece is arranged at the center of the pole piece in the length direction, and when at least two pole lugs are arranged on the pole piece, the pole piece is arranged at intervals in the length direction of the pole piece. The utility model discloses a coiling formula beans formula battery simple structure, it is sealed effectual, can realize filling soon and discharge with big multiplying power.

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, the tabs of the conventional winding type button battery are all positioned at the end parts of the pole pieces, so that the conventional button 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 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 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 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;

the pole piece of coiling formula electricity core is rectangular shape, works as set up one on the pole piece during utmost point ear, 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 utmost point ear, at least two utmost point ear is followed the length direction interval of pole piece sets up, utmost point ear extends to the outside 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 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 preferable scheme of the wound bean battery, the pole piece comprises a current collector and an active substance coated on the current collector, and the tab and the current collector are integrally formed; or the like, or, alternatively,

the current collector is provided with an empty foil area which is not coated with the active substance, one end of the tab is welded with the empty foil area, and the other end of the tab extends to the outside of the winding type battery cell.

As a preferable scheme of the winding type bean battery, when at least two 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 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 winding type bean battery, at least two 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 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 a tab of the winding type battery cell 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; the winding type bean battery can meet the requirements of quick charge and high-rate discharge by arranging a single lug at 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 at intervals.

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 a wound bean battery according to another 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.

Fig. 11 is a schematic structural view of a pole piece and a tab in an expanded state according to an embodiment of the present invention.

Fig. 12 is a schematic structural view of a pole piece and a tab in an expanded state 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.

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, and fig. 11, the winding type bean battery of the present invention includes a bottom case 1 and a cap 2, a space for accommodating the winding type battery cell 3 is formed between the bottom case 1 and the cap 2, one tab 31 of the winding type battery cell 3 is connected with the cap 2, the other tab 31 is connected with the bottom case 1, the bottom shell 1 comprises a bottom plate 11 and a first surrounding wall 12 annularly arranged on one side surface of the bottom plate 11, the cap 2 comprises a top plate 21 and a second surrounding wall 22 arranged around one side of the top plate 21, the second surrounding wall 22 is sleeved outside the first surrounding wall 12, a plurality of continuous first arc-shaped parts 13 are arranged on the first surrounding wall 12 along the axial direction thereof, a plurality of second arc-shaped parts 23 matched with the first arc-shaped parts 13 are arranged on the second surrounding wall 22 along the axial direction of the second surrounding wall, and a sealing element 4 is clamped between the first surrounding wall 12 and the second surrounding wall 22; pole piece 34 of coiling formula electricity core 3 is rectangular shape, works as set up one on the pole piece 34 during utmost point ear 31, utmost point ear 31 sets up the central point of the length direction of pole piece 34 puts, works as set up two at least on the pole piece 34 during utmost point ear 31, at least two utmost point ear 31 is followed the length direction interval of pole piece 34 sets up, utmost point ear 31 extends to coiling formula electricity core 3's outside. 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; by arranging a single tab 31 at the center of the pole piece 34 of the winding type battery cell 3 in the length direction, or arranging a plurality of tabs 31 on the pole piece 34 at intervals, the winding type bean battery can meet the requirements of quick charge and high-rate discharge.

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.

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, 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 and fig. 11, 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 and both have a long strip shape, and each pole piece 34 includes a current collector and an active material coated on the current collector.

In this embodiment, only one positive tab 311 is disposed on the positive tab 341, only one negative tab 312 is disposed on the negative tab 342, the positive tab 311 is located at the center of the positive tab 341 in the length direction and extends towards the upper side of the winding-type cell 3 to be connected with the cap 2, and the negative tab 312 is located at the center of the negative tab 342 in the length direction and extends towards the lower side of the winding-type cell 3 to be connected with the bottom case 1.

Of course, the number of tabs 31 on the pole piece 34 is not limited to one, and may be two or more, and when two or more tabs 31 are provided on the pole piece 34, one tab 31 is provided at the center position in the longitudinal direction of the pole piece 34, and the remaining tabs 31 are provided at one side or both sides of the tab 31 at intervals. As shown in fig. 12, three tabs 31 are provided on each pole piece 34 as an example, one tab 31 is provided at the center of the pole piece 34 in the longitudinal direction, and the remaining two tabs 31 are symmetrically provided along the center of the pole piece 34 in the longitudinal direction.

In other embodiments, if at least two tabs 31 are provided on the pole piece 34, the tabs 31 may also be provided at the ends of the pole piece 34 in the longitudinal direction.

As shown in fig. 1, 9 and 10, when the tab 31 is led out from the end of the pole piece 34, the current collector has an extension portion 32 extending to the outside of the active material along the radial direction of the wound battery cell 3, the extension portion 32 is partially overlapped after being bent, the extension portion 32 and the pole piece 34 are arranged at an included angle, and the extension portion 32 is bent to form 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.

When the tab 31 is led out from the non-end position of the pole piece 34, the current collector of the pole piece 34 directly extends out of the extension portion 32 along the axial direction of the winding type battery cell 3, and the tab 31 can be formed without bending.

In other embodiments, the structure that the tab 31 and the current collector of the pole piece 34 are integrated is not limited to be adopted, and the tab 31 and the current collector of the pole piece 34 may be separately arranged, for example, an empty foil area not coated with the active material is arranged at a corresponding position on the current collector, one end of the tab 31 is welded with the empty foil area, and the other end of the tab 31 extends to the outside of the winding type battery cell 3.

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 nickel plate, which is a material of the conventional tab, so that the isolation portion 351 is not easily pierced by the tab 31 when being attached to the end surface of the winding-type cell 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 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.

6. 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,

7. 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.

8. A rolled bean battery according to any one of claims 1-7, characterized in that the bottom case and the cap are both made of a metal material.

9. The wound bean cell of any one of claims 1 to 7, wherein the pole piece comprises a current collector and an active material coated on the current collector, the tab being integrally formed with the current collector; or the like, or, alternatively,

10. A rolled bean-type battery according to any one of claims 1 to 7, characterized in that when at least two of the tabs are provided on the pole piece, one of the tabs is located at the center of the pole piece in the longitudinal direction, and the remaining tabs are spaced apart from the tabs located at the center of the pole piece in the longitudinal direction.

11. A rolled bean-type battery according to claim 10, characterized in that at least two and a single number of the tabs are provided on the pole piece, one of the tabs is located at the center of the pole piece in the longitudinal direction, and the remaining tabs are provided symmetrically with respect to the center of the pole piece in the longitudinal direction.

12. A coiled bean-type battery according to any of claims 1 to 7, wherein the coiled cell comprises a positive plate, a negative plate, and a separator disposed between the positive plate and the negative plate, the separator has a separation part extending to both ends of the negative plate along the axial direction of the coiled cell, and the separation part is used for separating a tab of the coiled cell from an end face of the coiled cell.