CN212011035U - Battery with a battery cell - Google Patents

Abstract

The utility model discloses a battery, including drain pan, block and electric core, form the chamber that holds electric core between drain pan and the block, the inside wall of block is provided with the metal anticorrosive coating, and the metal anticorrosive coating can shelter from the block and be located all regions that hold the intracavity, and the metal anticorrosive coating has relative first side and the second side that sets up, sets up conductive adhesive layer between the inside wall of first side and block, and the second side welds with the positive ear of electric core. The utility model discloses a battery simple structure can prevent effectively that the block from corroding, promotes the safety in utilization of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery.

Background

A bean cell is a very small size cell, also known as a button cell or button cell. The beans formula battery generally includes drain pan, block and sets up the electric core that holds the intracavity at the two constitution, and the positive ear and the block of electric core are connected, and the negative pole ear is connected with the drain pan, and the block is stainless steel material usually, and the positive ear of electric core is aluminium generally, and the positive ear is connected with the block through welding mode and electricity. The stainless steel cap can corrode electrolyte in the battery in the long-term use process, so that the battery has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

To achieve the above object, the embodiment of the present invention provides a method for manufacturing a semiconductor device: the battery is simple in structure, good in corrosion resistance effect and high in safety.

The embodiment adopts the following technical scheme:

the utility model provides a battery, includes drain pan, block and electric core, the drain pan with form between the block and hold the chamber that holds of electric core, the inside wall of block is provided with the metal anticorrosive coating, the metal anticorrosive coating can shelter from the block is located hold all regions of intracavity, the metal anticorrosive coating has relative first side and the second side that sets up, first side with set up conductive adhesive layer between the inside wall of block, the second side with the anodal ear welding of electric core.

As a preferred scheme of battery, the drain pan includes that the bottom plate is established with the ring the first leg of a side of bottom plate, the block includes that the roof is established with the ring the second leg of a side of roof, the second leg cover is established outside the first leg, first leg with be provided with the sealing washer between the second leg, the metal anticorrosive coating sets up the inside wall of roof.

As a preferable scheme of the battery, the area of the metal anticorrosive layer for shielding the top plate is greater than or equal to the area of the top plate in the accommodating cavity.

As a preferable mode of the battery, the second side surface portion abuts against the seal ring.

As a preferable mode of the battery, the conductive adhesive layer covers the first side surface.

As a preferable scheme of the battery, the conductive adhesive layer is partially located outside the metal anticorrosive layer, and the sealing ring is abutted to the conductive adhesive layer.

As a preferable scheme of the battery, a circle of the conductive adhesive layer is arranged on the first side surface along the periphery of the metal anti-corrosion layer.

As a preferable mode of the battery, the material of the metal anticorrosive layer is the same as that of the positive electrode tab.

As a preferable scheme of the battery, the second side surface is provided with an adhesive layer corresponding to the sealing ring.

As a preferable scheme of the battery, the first surrounding wall and the second surrounding wall both include a plurality of wall plates which are sequentially connected at an included angle along the axial direction of the wall plates, a fastening portion which fastens the sealing ring is formed at a joint of the adjacent wall plates, and the fastening portion on the first surrounding wall corresponds to the fastening portion on the second surrounding wall in shape.

The utility model discloses beneficial effect does: utilize conductive adhesive layer to bond a metal anticorrosive coating through the inside wall at the block to make metal anticorrosive coating and anodal ear welding, can utilize the metal anticorrosive coating to keep apart cap and anodal ear, prevent effectively that anodal ear and cap from being corroded and the weeping or scrapping, and conductive adhesive layer can electric intercommunication metal anticorrosive coating and block, and sticky mode operation degree of difficulty is low, can effectively reduce manufacturing cost, in addition, conductive adhesive layer can also the inside wall of shutoff cap with clearance between the metal anticorrosive coating stops electrolyte completely and enters into between the inside wall of metal anticorrosive coating and cap.

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 battery according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a bottom case according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a cap according to an embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a portion a of fig. 1.

In the figure:

1. a bottom case; 11. a base plate; 12. a first enclosure wall; 121. a first inner wall panel; 122. a second inner wall panel; 123. a third inner wall panel; 124. a fourth inner wall panel; 125. a fifth inner wall panel;

2. capping; 21. a top plate; 22. a second enclosure wall; 221. a first exterior wall panel; 222. a second fascia panel; 223. a third exterior wall panel;

3. an electric core; 31. a positive tab;

4. an accommodating chamber; 5. a metal corrosion protection layer; 6. a conductive adhesive layer; 7. and (5) sealing rings.

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.

As shown in fig. 1 to 4, the battery of the present invention includes a bottom case 1, a cap 2 and an electric core 3, the bottom case 1 and the cap 2 are formed with a holding cavity 4 for the electric core 3, the inner side wall of the cap 2 is provided with a metal corrosion protection layer 5, the metal corrosion protection layer 5 can shelter from the cap 2 is located in all regions of the holding cavity 4, the metal corrosion protection layer 5 has a first side and a second side which are arranged relatively, the first side and a conductive adhesive layer 6 is arranged between the inner side wall of the cap 2, and the second side is welded to the positive electrode tab 31 of the electric core 3. Utilize a metal anticorrosive coating 5 of 6 bonding of conductive adhesive layer through the inside wall at block 2, and make metal anticorrosive coating 5 and anodal ear 31 welding, can utilize metal anticorrosive coating 5 to keep apart cap 2 and anodal ear 31, prevent effectively that anodal ear 31 and block 2 from being corroded and the weeping or scrapping, and conductive adhesive layer 6 can electrically communicate metal anticorrosive coating 5 and cap 2, and sticky mode operation degree of difficulty is low, can effectively reduce manufacturing cost, in addition, conductive adhesive layer 6 can also block up the inside wall of block 2 with clearance between the metal anticorrosive coating 5, stop electrolyte completely and enter into between the inside wall of metal anticorrosive coating 5 and cap 2.

Preferably, drain pan 1 includes that bottom plate 11 and ring establish the first leg 12 of a side of bottom plate 11, block 2 includes that roof 21 and ring establish the second leg 22 of a side of roof 21, second leg 22 cover is established outside first leg 12, first leg 12 with be provided with sealing washer 7 between the second leg 22, metal anticorrosive coating 5 paste through conductive adhesive layer 6 in the inside wall of roof 21, conductive adhesive layer 6 not only can electrically connect roof 21 and metal anticorrosive coating 5, realizes fixedly to metal anticorrosive coating 5, can also be used to the gap between sealed metal anticorrosive coating 5 and the roof 21.

As shown in fig. 1, the metal corrosion protection layer 5 can shield all regions of the cap 2 in the containing cavity 4, which are regions denoted by D1, when there is no metal corrosion protection layer 5, a region where the inner side wall of the top plate 21 of the cap 2 directly contacts with the electrolyte is a region D1, the size of the top plate 21 is D2, a region where the sealing ring 7 can shield the inner side wall of the top plate 21 is a region B shown in the figure, and when the metal corrosion protection layer 5 is designed, the metal corrosion protection layer 5 is to shield all regions of the cap 2 in the containing cavity 4, and then the size of the metal corrosion protection layer 5 is necessarily greater than or equal to the size of the region D1.

The area where the inner side wall of the cap 2 is likely to be in contact with the electrolyte is covered completely, and the possibility that the cap 2 is corroded is completely avoided. Preferably, the area of the metal corrosion protection layer 5 covering the top plate 21 is greater than or equal to the area of the top plate 21 in the accommodating cavity 4. During the in-service use, roof 21 just can with hold the electrolyte contact in the chamber 4, and second leg 22 is established outside first leg 12, set up sealing washer 7 again between two legs, so second leg 22 general conditions can not contact electrolyte, consequently can need not to consider to set up metal anticorrosive coating 5 at the inside wall of second leg 22, the cost is reduced effectively, and for promoting anticorrosive comprehensive, so be located the region that holds the chamber 4 and carry out comprehensive sheltering from to roof 21.

Of course, if the second surrounding wall 22 of the cap 2 connected with the positive tab 31 is located in the accommodating cavity 4, the second surrounding wall 22 can be further covered by the metal corrosion-resistant layer 5.

Further preferably, in the present embodiment, the shape of the metal corrosion prevention layer 5 matches the shape of the top plate 21, and the size is smaller than the top plate 21 but larger than or equal to the size of all the areas of the cap 2 located in the accommodating chamber 4, so that the metal corrosion prevention layer 5 can be fitted to the inner side wall of the top plate 21.

Of course, the size of the metal corrosion protection layer 5 may be smaller than that of the top plate 21 while ensuring the reliability and convenience of the welding of the positive tab 31 and the metal corrosion protection layer 5.

The metal anticorrosive layer 5 and the positive electrode tab 31 are made of the same material. The metal anti-corrosion layer 5 is made of the same material as the positive lug 31, so that the corrosion probability of the positive lug 31 and the corrosion probability of the cap 2 can be effectively reduced, and the service life of the battery can be prolonged.

Specifically, positive tab 31 adopts aluminium to make, and metal anticorrosive coating 5 is any one of aluminum plate, aluminium foil, aluminium membrane and aluminum sheet, or adopts the composite bed to make, and the composite bed includes the substrate and sets up the aluminium lamination that is close to positive tab 31 one side at the substrate, and the material of substrate can be unanimous with the material of block 2.

The metal shell (the bottom shell 1 and the cover cap 2) is high in hardness, so that the appearance form of the whole battery can be guaranteed to be unchanged, and the situation that the shell is deformed due to air inflation in the battery can be effectively prevented. The bottom case 1 and the cap 2 may be made of a single metal or an alloy material. In this embodiment, the bottom case 1 and the cap 2 are both made of stainless steel, and in addition, on the premise of ensuring the mechanical strength, a metal foil material may be further adopted, for example: steel foil, and thus, the weight of the battery can be further reduced.

In one embodiment, when the metal corrosion protection layer 5 covers all areas of the cap 2 in the accommodating cavity 4, the conductive adhesive layer 6 covers the whole first side of the metal corrosion protection layer 5. This design can strengthen the electric conduction effect between metal anticorrosive coating 5 and the block cap 2, can also carry out comprehensive shutoff to the clearance between metal anticorrosive coating 5 and the block cap 2, stops electrolyte to enter into between metal anticorrosive coating 5 and the block cap 2 completely.

Of course, in other embodiments, the first side of the metal corrosion protection layer 5 is provided with a circle of the conductive adhesive layer 6 along the circumference of the metal corrosion protection layer 5, the conductive adhesive layer 6 is annularly provided, and the conductive adhesive layer 6 is annularly provided, so that the usage amount of the adhesive can be reduced, and the manufacturing cost is reduced. When the size of the metal corrosion protection layer 5 is smaller than all the areas of the cap 2 in the accommodating cavity 4, the conductive adhesive layer 6 may further extend out of the metal corrosion protection layer 5 to cover all the areas of the cap 2 in the accommodating cavity 4 not covered by the metal corrosion protection layer 5.

When the size of the metal corrosion protection layer 5 is smaller than that of all the areas of the cap 2 in the accommodating cavity 4, the sealing ring 7 is preferably abutted with the conductive adhesive layer 6 outside the metal corrosion protection layer 5. Support sealing washer 7 tight outer conductive adhesive layer 6 of metal anticorrosive coating 5 after the assembly, not only can further prevent that electrolyte from entering into between the inside wall of metal anticorrosive coating 5 and block 2 or the inside wall of block 2 is not provided with the region of metal anticorrosive coating 5, can also carry out the secondary to metal anticorrosive coating 5 and fix, prevent that metal anticorrosive coating 5 from taking place the displacement.

In an embodiment, the sealing ring 7 is provided with an insertion groove, the upper end of the bottom casing 1 is inserted into the insertion groove, that is, one end of the first leg 12, which is far away from the bottom plate 11, is inserted into the insertion groove, so that the sealing ring 7 is abutted to the inner side wall of the first leg 12 of the bottom casing 1, the end surface of the first leg, which is far away from the bottom plate 11, and the outer side wall. During actual installation, after the upper end of the bottom case 1 is sleeved with the sealing ring 7, the battery cell 3 is placed in the bottom case 1. Through installing electric core 3 again after sealing washer 7 is installed in place, can reduce the installation degree of difficulty of sealing washer 7, guarantee that sealing washer 7 pastes tightly at the inside wall of drain pan 1. In addition, the part of the sealing ring 7 located on the inner side wall of the first surrounding wall 12 can also insulate and isolate the battery cell 3.

When the metal anticorrosive layer 5 covers all the areas of the cap 2 in the accommodating cavity 4, after the cap 2 and the bottom shell 1 are assembled, the part of the sealing ring 7 on the upper end surface of the bottom shell 1 abuts against the second side surface of the metal anticorrosive layer 5. The second side of supporting tight metal anticorrosive coating 5 with sealing washer 7 after the assembly supports tightly, not only can further prevent that electrolyte from entering into between the inside wall of metal anticorrosive coating 5 and block 2 or the inside wall of block 2 is not provided with the region of metal anticorrosive coating 5, can also carry out the secondary to metal anticorrosive coating 5 and fix, prevents that metal anticorrosive coating 5 from taking place the displacement.

In order to further increase the sealing performance between the bottom shell 1 and the cap 2, a sealant is arranged between the sealing ring 7 and the second side surface of the metal anticorrosive layer 5 so as to form secondary sealing between the bottom shell 1 and the cap 2, and the sealing effect is greatly improved.

In an embodiment, each of the first surrounding wall 12 and the second surrounding wall 22 includes a plurality of wall plates sequentially connected at an included angle along an axial direction thereof, a fastening portion for fastening the seal ring 7 is formed at a joint of the adjacent wall plates, and the fastening portion on the first surrounding wall 12 corresponds to the fastening portion on the second surrounding wall 22 in shape. Through set up the toper portion of supporting on first leg 12 and second leg 22, and the shape of the portion of supporting that sets up on first leg 12 and the second leg 22 corresponds each other, can compress tightly sealing washer 7 between first leg 12 and second leg 22, has showing the leakproofness that has promoted between drain pan 1 and the block 2.

Specifically, as shown in fig. 1 to 3, the second surrounding wall 22 includes a first outer wall panel 221, a second outer wall panel 222 and a third outer wall panel 223 connected in this order along the axial direction thereof, the first outer wall panel 221 is connected perpendicularly to the top panel 21, and the second outer wall panel 222 is inclined toward a side away from the center of the second surrounding wall 22; the third outer wall plate 223 is inclined towards one side of the center of the second surrounding wall 22, or the third outer wall plate 223 comprises a first sub-wall plate and a second sub-wall plate which are arranged at an included angle, the first sub-wall plate is connected with the second outer wall plate 222 and is vertical to the top plate 21, and the second sub-wall plate is inclined towards one side of the center of the second surrounding wall 22; first enclosure wall 12 includes along its axial first interior wall board 121, second interior wall board 122, third interior wall board 123, fourth interior wall board 124 and the fifth interior wall board 125 that connects gradually, the fifth interior wall board 125 with bottom plate 11 is connected perpendicularly, fourth interior wall board 124 orientation one side slope at the center of first enclosure wall 12, third interior wall board 123 with first interior wall board 121 all with bottom plate 11 is perpendicular, second interior wall board 122 orientation the outside slope of first enclosure wall 12, first outer wall board 221 with first interior wall board 121 is parallel and passes through sealing washer 7 supports each other and holds, second outer wall board 222 with second interior wall board 122 is parallel and passes through sealing washer 7 supports each other and holds, third outer wall board 223 will be located sealing washer 7 on one side of third interior wall board 123 and fourth interior wall board 124 presss from both sides tightly. Note that: the inclination directions of the outer wall plate and the inner wall plate are determined from the top-down direction.

In a specific embodiment of the present invention, the third outer wall plate 223 is perpendicular to the top plate 21 after the cap 2 is manufactured and molded, and after the cap 2 is assembled on the bottom shell 1, the end of the third outer wall plate 223 away from the second outer wall plate 222 is pressed toward the first wall 12 to form a necking, so that the third outer wall plate 223 of the assembled and molded cap 2 is in a state of inclining toward the inside of the second wall 22.

Of course, the third outer wall panel 223 is not limited to be integrally inclined toward one side of the center of the second surrounding wall 22, and the third outer wall panel 223 may be provided in other structures, for example, the third outer wall panel 223 includes a first sub-wall panel and a second sub-wall panel arranged at an included angle, the first sub-wall panel is connected with the second outer wall panel 222 and is perpendicular to the top panel 21, the second sub-wall panel is inclined toward one side of the center of the second surrounding wall 22, the first sub-wall panel and the third inner wall panel 123 are parallel and are abutted against each other through the sealing layer, and the second sub-wall panel and the fourth inner wall panel 124 are parallel and are abutted against each other through the sealing layer, in this case, the second outer wall panel 222 and the second sub-wall panel are preferably symmetrically arranged along the first sub-wall panel.

In one embodiment, referring to fig. 1, 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 wall 12, and the second wall 22 of the cap 2 may be set long enough to extend to the side of the bottom plate 11 away from the end of the first wall 12 after the cap 2 is assembled on the bottom case 1, and then the necking portion of the second wall 22 is subjected to necking, and the necking portion abuts against the outer wall of the bottom plate 11.

Alternatively, 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.

The battery cell 3 may be a winding battery cell 3, or may be a laminated battery cell 3, and the battery cell 3 is exemplified as the winding battery cell 3.

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

Coiling formula electricity core 3 includes pole piece, diaphragm and utmost point ear, and the pole piece includes positive plate and negative pole piece, and the utmost point ear includes positive plate 31 and negative pole ear, and wherein, positive plate 31 is connected with the positive plate, and the negative pole ear is connected with the negative pole piece, and positive plate, diaphragm and negative pole piece are convoluteed after superposing in proper order and are formed coiling formula electricity core 3.

The positive electrode tab 31 and the negative electrode tab of the winding type battery cell 3 are respectively led out from two ends of the winding type battery cell 3, wherein the positive electrode tab 31 is welded with the metal anticorrosive layer 5, and the negative electrode tab is welded with the bottom shell 1. The positive electrode tab 31 is not limited to be led out from the upper end of the winding type battery cell 3, the negative electrode tab is led out from the lower end of the winding type battery cell 3, the leading-out positions of the positive electrode tab 31 and the leading-out positions of the negative electrode tab can be exchanged, namely, the positive electrode tab 31 is led out from the lower end of the winding type battery cell 3 to be welded with the bottom case 1, the negative electrode tab is led out from the upper end of the winding type battery cell 3 to be welded with the cap 2, and at the moment, the metal anti-corrosion layer 5 is welded with the inner.

The pole piece of coiling formula electricity core 3 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 coiling formula electricity core 3's axis direction extends, utmost point ear extends to coiling formula electricity core 3's outside. The battery can meet the requirements of quick charge and high-rate discharge by arranging a single tab at the central position of the pole piece of the winding type battery cell 3 in the length direction or arranging a plurality of tabs on the pole piece.

Of course, when a tab is provided on the pole piece, the tab may also be provided at the end of the pole piece.

In an embodiment, only one positive tab 31 is disposed on the positive tab, only one negative tab is disposed on the negative tab, the positive tab 31 is located at the center of the positive tab 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 is located at the center of the negative tab 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 the tabs on the pole piece is not limited to one, and may be two or more, when two or more tabs are provided on the pole piece, all the tabs are provided at intervals along the length direction of the pole piece, one tab is provided at the center position of the length direction of the pole piece, and the remaining tabs are provided at intervals at one side or both sides of the tab. Taking the example of arranging five tabs on each pole piece, one tab is arranged at the center of the pole piece in the length direction, and the remaining four tabs are arranged symmetrically along the center of the pole piece in pairs.

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

Or, the length direction and the width direction of the pole piece are both provided with a tab, the length direction of the pole piece is provided with one tab, the width direction is also provided with one tab, and the tab arranged on the width direction of the pole piece extends along the radial direction of the winding type battery cell 3.

When utmost point ear setting is when the width direction of pole piece, the mass flow body has the extension that extends to the outside active material along the radial direction of coiling formula electricity core 3, and the extension can also be the contained angle setting with the pole piece, and the extension forms this utmost point ear, and when extension and pole piece become the contained angle setting, coiling formula electricity core 3 coiling shaping back, utmost point ear directly draws forth to coiling formula electricity core 3's outside along the axis direction of coiling formula electricity core 3. The extension part of the current collector of the pole piece extends to the outside of the active material and is bent to directly form the pole lug, so that the pole lug welding process is omitted, the production efficiency is improved, the internal resistance of the winding type battery cell 3 is reduced, and meanwhile, the pole lug and the pole piece which are integrally formed are higher in strength and difficult to separate.

When utmost point ear setting is in the length direction of pole piece, utmost point ear need not to buckle, directly can draw forth to coiling formula electricity core 3's outside, the mass flow body has the extension that extends to the active material outside along coiling formula electricity core 3's axial direction, this extension need not to buckle directly to form utmost point ear, specifically, be provided with this extension on the length direction who is rectangular shape positive plate or negative pole piece, when coiling along the length direction who is rectangular shape positive plate or negative pole piece, this extension directly is formed at coiling formula electricity core 3's axial direction's both ends, then become positive plate 31 with the extension of positive plate respectively, the extension of negative pole piece becomes negative pole ear.

Preferably, when the extension parts are bent to form the tabs, the overlapped positions of the extension parts are provided with the reinforcing members. Set up extra reinforcement through the coincide position at the extension, the reinforcement can strengthen the intensity of the coincide position of bending, is prevented effectively that the extension from being broken after bending, protects the integrality of utmost point ear, has also strengthened the bulk strength of utmost point ear simultaneously.

The angle size that the extension was bent is according to the nimble adjustment of requirement when the encapsulation of coiling formula electricity core 3, specifically, the extension uses the position of the end connection with the pole piece as the fulcrum and buckles, buckles first contained angle alpha, and wherein first contained angle alpha is 90, and this angle can make the extension be convenient for draw forth from the both ends of coiling formula electricity core 3, shortens the length of utmost point ear, has reduced manufacturing cost. Of course, the bending angle of the extending portion is not limited to 90 °, and the first included angle α may also be set to 30 °, 45 °, 100 °, or 120 °, etc., as required.

In a preferred embodiment of the present invention, the reinforcement is an adhesive tape wrapped around the outside of the overlapping position of the extension. Set up the reinforcement into the sticky tape, can cushion the extension in the coincide position after buckling on the one hand, can slow down the stress of extension in the department of buckling to a certain extent, effectively reduce the fracture of extension in the coincide position and lead to the phenomenon of utmost point ear and pole piece separation, 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, prevent utmost point ear through long-time use back, the extension takes place to warp and influences the normal use of coiling formula electricity core 3 in the coincide position after buckling. To further enhance the protective effect of the tape on the extension, multiple layers of tape may be wrapped in the laminating position.

In another preferred embodiment of the present invention, the reinforcing member is a double-sided adhesive tape, the extending portion 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 to occupy the space between drain pan 1 and the block 2.

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

Certainly, the tab is not limited to be integrally formed with the current collector of the pole piece, but can be formed in a split manner, an active substance is not coated at a reserved position on the current collector of the pole piece to form an empty foil area, one end of the tab is welded with the empty foil area, and the other end of the tab is welded with the bottom shell 1 or the cap 2.

Preferably, when there are a plurality of positive electrode tabs 31 and negative electrode tabs, the plurality of positive electrode tabs 31 or negative electrode tabs may be gathered and then welded to the bottom case 1 or the cap 2.

In one embodiment, the separator has an isolation portion extending to both ends of the negative plate along the axial direction of the winding type cell 3, and the isolation portion is used for isolating a tab or a casing of the winding type cell 3 from the end surface of the winding type cell 3. The setting of isolation portion can prevent effectively that utmost point ear or casing from taking place the electrical contact with the both ends of the vertical direction of coiling formula electricity core 3, and this isolation portion and coiling formula electricity core 3 structure as an organic whole need not to set up insulating gasket in addition on the terminal surface of coiling formula electricity core 3, has reduced the preparation degree of difficulty and the cost of 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 battery, and insulating nature is good.

In this embodiment, the length of the end face of the winding type battery cell 3 from which the isolation portion extends 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, the negative plate and the diaphragm are wound has an isolation part with enough length so as to insulate and isolate the lug or the shell from the end face of the battery cell and ensure the insulation effect.

Of course, the isolating part is not limited to be provided to isolate the tab from the end surface of the winding type battery cell 3, and additional insulating sheets may be provided at the two ends of the winding type battery cell 3 to isolate the tab or the casing from the end surface of the winding type battery cell 3.

In general, the current collector of the positive electrode sheet is an aluminum foil, and the current collector of the negative electrode sheet is a copper foil, so that the material of the positive electrode tab 31 is an aluminum foil, and the material of the negative electrode tab is a copper foil. For the aluminum foil and the copper foil, the two are softer than the aluminum sheet (belt) or the nickel sheet (belt) of the existing tab, so that the isolating part is not easy to be pierced by the tab when being attached to the end face of the winding type battery cell 3.

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

The battery further comprises an auxiliary part, the auxiliary part is of a cylinder structure with two open ends and is provided with a first end and a second end which are arranged oppositely, one end, far away from the bottom plate 11, of the winding type battery cell 3 is inserted into the first end, and the second end is located above the winding type battery cell 3. Through setting up the auxiliary member in coiling formula electricity core 3's top, 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, 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 simultaneously, greatly promoted production efficiency, reduced manufacturing cost.

The first end is connected with the end of the winding type battery cell 3 far away from the bottom plate 11, and the design can reduce the occupation of the inner space of the shell 1 of the bottom shell and even the shell of the whole battery by the auxiliary part as much as possible. Preferably, the first end of the auxiliary member 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 can be enlarged, and the auxiliary member can be conveniently connected to the winding type battery cell 3.

Preferably, the auxiliary member is the drum structure, and the size of first end equals the size of second end promptly, and this design can make the inner chamber of auxiliary member diameter everywhere unanimous, and during the notes liquid, the pressure direct action of the electrolyte in the inner chamber is in the tip of coiling formula electricity core 3, increases the pressure of the electrolyte in the inner chamber to coiling formula electricity core 3, more is favorable to coiling formula electricity core 3 to the absorption of electrolyte, improves the production efficiency of battery. Of course, in other embodiments, the auxiliary member 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, the inner cavity of the auxiliary part is provided with a liquid level height line, 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 is formed by winding the adhesive tape, and the first end of the auxiliary is attached to the outer peripheral portion of the winding type cell 3. Because the adhesive tape is thinner and has certain design effect, the adhesive tape is wound into an auxiliary piece, after the liquid injection is completed, the auxiliary piece is not required to be detached from the winding type battery cell 3, the adhesive tape can be directly packaged in the shell formed by the bottom shell 1 and the cover cap 2, the internal space of the shell is hardly occupied, the energy density of the battery is convenient to improve, the packaging difficulty is reduced, and the production efficiency of the 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 is not limited to be wound by using adhesive tape, and may be wound by using other materials that do not affect the performance of the battery, such as the same material as the separator.

Or the auxiliary part and the winding type battery cell 3 are directly taken as an integral structure, the size of the diaphragm adjacent to the outer ring can be made large, so that the wound diaphragm forms a circle of structure protruding outwards from the end face of one end of the winding type battery cell 3 departing from the bottom plate 11 at the periphery of the winding type battery cell 3, and the structure at least surrounds the periphery of the winding type battery cell 3 by a circle to form the auxiliary part. This design makes it possible to dispense with additional manufacturing and installation aids, so that the aids are formed after winding of the wound cells 3.

The utility model discloses a concrete manufacturing method of battery as follows:

step S100, providing an aluminum plate, and stamping the aluminum plate according to the shape of the cap 2 to form a metal anticorrosive layer 5;

step S200, bonding the metal anticorrosive layer 5 to the inner side wall of the top plate 21 of the cap 2 through the conductive adhesive layer 6;

step S300, sleeving a sealing ring 7 on the second surrounding wall 22 of the bottom shell 1;

step S400, welding the negative electrode tab with the bottom case 1, assembling the winding type battery cell 3 in the bottom case 1, welding the positive electrode tab 31 with the metal anticorrosive layer 5, and injecting liquid;

step S500, assembling the bottom case 1 and the cap 2, and pressing the lower end of the second wall 22 of the cap 2 to make it abut against the sealing ring 7.

Preferably the battery is a rechargeable battery. Of course, the battery of the embodiment of the present invention is not limited to a rechargeable battery, and may also be a disposable battery. The battery size is: the diameter-height ratio is more than or equal to 1; preferably > 1, for example: the diameter is 8-15mm, and the height is 1-8 mm.

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 (10)

1. The utility model provides a battery, includes drain pan, block and electric core, the drain pan with form between the block and hold the chamber that holds of electric core, a serial communication port, the inside wall of block is provided with the metal anticorrosive coating, the metal anticorrosive coating can shelter from the block is located hold all regions of intracavity, the metal anticorrosive coating has relative first side and the second side that sets up, first side with set up conductive adhesive layer between the inside wall of block, the second side with the anodal ear welding of electric core.

2. The battery according to claim 1, wherein the bottom case comprises a bottom plate and a first surrounding wall surrounding one side of the bottom plate, the cap comprises a top plate and a second surrounding wall surrounding one side of the top plate, the second surrounding wall is sleeved outside the first surrounding wall, a sealing ring is arranged between the first surrounding wall and the second surrounding wall, and the metal corrosion-resistant layer is arranged on the inner side wall of the top plate.

3. The battery of claim 2, wherein the area of the metal corrosion protection layer covering the top plate is greater than or equal to the area of the top plate in the receiving cavity.

4. The battery of claim 3, wherein the second side portion abuts the sealing ring.

5. The battery of claim 3, wherein the conductive adhesive layer covers the first side.

6. The battery of claim 2, wherein the layer of conductive adhesive is partially outside the metal corrosion protection layer, and the sealing ring abuts the layer of conductive adhesive.

7. The battery of claim 1, wherein a circle of the conductive adhesive layer is disposed on the first side along a periphery of the metal corrosion protection layer.

8. The battery according to any one of claims 1 to 7, wherein the metal corrosion prevention layer is made of a material identical to that of the positive electrode tab.

9. The battery of any one of claims 2 to 5, wherein the second side is provided with an adhesive layer corresponding to the sealing ring.

10. The battery according to any one of claims 2 to 5, wherein the first surrounding wall and the second surrounding wall each comprise a plurality of wall plates sequentially connected at an included angle along the axial direction, a joint between adjacent wall plates forms a pressing portion for pressing against the sealing ring, and the pressing portion on the first surrounding wall and the pressing portion on the second surrounding wall correspond in shape to each other.

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