CN111554834B - Battery manufacturing method and battery - Google Patents
Battery manufacturing method and battery Download PDFInfo
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- CN111554834B CN111554834B CN202010382980.1A CN202010382980A CN111554834B CN 111554834 B CN111554834 B CN 111554834B CN 202010382980 A CN202010382980 A CN 202010382980A CN 111554834 B CN111554834 B CN 111554834B
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- cap
- battery
- metal anticorrosive
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- layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/109—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery manufacturing method and a battery, wherein the battery manufacturing method comprises the following steps: before the bottom shell and the cover cap of the battery are assembled, a metal anticorrosive layer is bonded in the cover cap, and then the metal anticorrosive layer is hot-pressed, so that at least part of the metal anticorrosive layer is in contact with the inner side wall of the cover cap, and the positive lug of the battery core of the battery is welded with the metal anticorrosive layer. The battery manufacturing method provided by the invention is simple to operate, can effectively prevent the cap from being corroded, and improves the use safety of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery manufacturing method and a battery.
Background
A bean cell is a very small size cell, also known as a button cell or button cell. The bean type battery generally comprises a bottom shell, a cover cap and an electric core arranged in a containing cavity formed by the bottom shell and the cover cap, wherein a positive tab of the electric core is connected with the cover cap, a negative tab of the electric core is connected with the bottom shell, the cover cap is usually made of stainless steel, the positive tab of the electric core is generally made of aluminum, and the positive tab is electrically connected with the cover cap in an ultrasonic welding mode, an electric resistance welding mode and the like. 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.
Disclosure of Invention
One object of an embodiment of the present invention is to: the battery manufacturing method is simple to operate, can effectively prevent the cap from being corroded, and improves the use safety of the battery.
Another object of an embodiment of the present invention is to: the battery is simple in structure, good in corrosion resistance effect and high in safety.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a metal anticorrosive layer is bonded in a cap before a bottom case and the cap of a battery are assembled, and then the metal anticorrosive layer is hot-pressed to enable at least part of the metal anticorrosive layer to be in contact with the inner side wall of the cap, so that a positive tab of a battery core of the battery is welded with the metal anticorrosive layer.
As a preferable scheme of the battery manufacturing method, a sealant is coated on one side surface of the metal anticorrosive layer close to the cap, and the sealant does not completely cover the metal anticorrosive layer; or the like, or, alternatively,
and coating the sealant at the mounting position of the inner side wall of the cover cap corresponding to the metal anticorrosive layer, wherein the mounting position is not completely covered by the sealant.
As a preferable scheme of the battery manufacturing method, the sealant is annularly arranged along the periphery of the metal anticorrosive layer.
As a preferable scheme of the battery manufacturing method, part of the sealant between the cap and the metal anticorrosive layer overflows out of the metal anticorrosive layer in the hot pressing process.
As a preferable scheme of the battery manufacturing method, the battery is provided with a containing cavity for containing the battery core, and the metal anticorrosive layer covers all areas of the cap in the containing cavity.
As a preferable scheme of the battery manufacturing method, the metal anticorrosive layer and the positive electrode tab are made of the same material.
As a preferable mode of the battery manufacturing method, when the positive tab is welded, the positive tab, the metal corrosion-resistant layer and the cap are welded into a whole.
As a preferred scheme of the battery manufacturing method, after a sealing ring is sleeved at the upper end of the bottom case, the battery core is placed in the bottom case, and the sealing ring is partially attached to the inner side wall of the bottom case and partially attached to the outer side wall of the bottom case.
As a preferred scheme of the battery manufacturing method, after the metal anticorrosive coating is hot-pressed, the part of the sealant between the metal anticorrosive coating and the cover cap overflows to the outside of the metal anticorrosive coating, and after the cover cap and the bottom shell are assembled, the part of the sealing ring on the upper end surface of the bottom shell is bonded with the metal anticorrosive coating through the sealant.
In a second aspect, a battery is provided, which comprises a bottom shell, a cap and an electric core, wherein the bottom shell and the cap are metal pieces, a containing cavity for containing the electric core is formed between the bottom shell and the cap, a metal anticorrosive layer is bonded on the inner side wall of the cap, at least part of the metal anticorrosive layer is in contact with the inner side wall of the cap, and the metal anticorrosive layer is welded with the positive electrode lug of the electric core.
The embodiment of the invention has the beneficial effects that: the metal anticorrosive layer is bonded in the cap in advance, and at least part of the metal anticorrosive layer is in contact with the inner side wall of the cap in a hot pressing mode, so that the cap and the positive electrode lug can be isolated by the metal anticorrosive layer, the cap is effectively prevented from being corroded and leaking liquid, reliable electric conduction among the cap, the metal anticorrosive layer and the positive electrode lug can be ensured, the whole operation process is simple and reliable, and the sealant is not arranged on one side surface of the metal anticorrosive layer, which is far away from the inner side wall of the cap, so that the welding of the metal anticorrosive layer and the positive electrode lug can not be influenced completely; through setting up sealed glue, not only can the inside wall of shutoff block with clearance between the metal anticorrosive coating stops electrolyte completely to enter into between the inside wall of metal anticorrosive coating and block, can also fix the initial position of metal anticorrosive coating, and the position of metal anticorrosive coating can not remove for the block when guaranteeing hot pressing operation.
Drawings
The invention is explained in more detail below with reference to the figures 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 invention.
Fig. 3 is a schematic cross-sectional view of a cap of an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of the cap bonded with the metal corrosion protection layer according to the embodiment of the invention.
Fig. 5 is a partially enlarged view of a portion a of fig. 4.
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. sealing glue; 7. and (5) sealing rings.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. 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, 4 and 5, the battery according to the embodiment of the invention includes a bottom case 1, a cap 2 and a battery cell 3, where the bottom case 1 and the cap 2 are both of a shell structure with one end sealed and the other end open, the cap 2 is assembled with the bottom case 1, a sealing ring 7 is arranged between the cap 2 and the bottom case 1 for sealing, the battery cell 3 is installed in a containing cavity 4 formed by the bottom case 1 and the cap 2, a positive tab 31 of the battery cell 3 is connected with the cap 2, and a negative tab of the battery cell 3 is connected with the bottom case 1.
The inner side wall of the cap 2 of the battery is bonded with the metal anticorrosive coating 5 through the sealant 6, the sealant 6 can block a gap between the metal anticorrosive coating 5 and the inner side wall of the cap 2, and at least part of the metal anticorrosive coating 5 is in contact with the inner side wall of the cap 2.
The battery manufacturing method of the embodiment of the invention comprises the following steps: before the bottom shell 1 and the cap 2 of the battery are assembled, a metal anticorrosive layer 5 is bonded in the cap 2, and then the metal anticorrosive layer 5 is hot-pressed, so that at least part of the metal anticorrosive layer 5 is in contact with the inner side wall of the cap 2, and the positive lug 31 of the battery core 3 of the battery is welded with the metal anticorrosive layer 5. The metal anticorrosive layer 5 is bonded in the cap 2 in advance, and then at least part of the metal anticorrosive layer 5 is in contact with the inner side wall of the cap 2 in a hot pressing mode, so that the cap 2 and the positive lug 31 can be isolated by using the metal anticorrosive layer 5, the cap 2 is effectively prevented from being corroded and leaking liquid, the reliable electric conduction among the cap 2, the metal anticorrosive layer 5 and the positive lug 31 can be ensured, the whole operation process is simple and reliable, the sealant 6 is not arranged on one side surface of the metal anticorrosive layer 5, which is far away from the inner side wall of the cap 2, and the welding of the metal anticorrosive layer 5 and the positive lug 31 cannot be influenced completely; through setting up sealed glue 6, not only can the inside wall of shutoff block 2 with clearance between the metal anticorrosive coating 5 stops electrolyte completely and enters into between the inside wall of metal anticorrosive coating 5 and block 2, can also fix the initial position of metal anticorrosive coating 5, and the position of metal anticorrosive coating 5 can not remove for block 2 when guaranteeing hot pressing operation.
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 bonds through sealed glue 6 the inside wall of roof 21, sealed glue 6 is used for sealing up the gap between metal anticorrosive coating 5 and the roof 21, and metal anticorrosive coating 5 is close to a side part of roof 21 and the inside wall contact of roof 21.
During specific operation, sealed glue 6 can coat earlier and be close to at metal anticorrosive coating 5 a side of roof 21, then pack into the block 2 with metal anticorrosive coating 5 in, sealed glue 6 can not cover the side that metal anticorrosive coating 5 is close to roof 21 completely when coating, can guarantee like this that back when hot pressing metal anticorrosive coating 5, metal anticorrosive coating 5 at least part can realize contacting with roof 21, guarantees the electric conduction effect.
Or, the sealant 6 is firstly coated on the mounting position of the top plate 21 where the metal anticorrosive coating 5 needs to be mounted, and then the metal anticorrosive coating 5 is mounted in the cap 2, so that the mounting position cannot be completely covered by the sealant 6 during coating.
Further, the sealant 6 is annularly arranged along the periphery of the metal corrosion protection layer 5. The annular arrangement along the periphery of the metal corrosion-resistant layer 5 can ensure that the central area of the metal corrosion-resistant layer 5 has a larger area to be contacted with the top plate 21, and can completely seal the gap between the metal corrosion-resistant layer 5 and the top plate 21.
Further, the metal corrosion prevention layer 5 covers all areas of the cap 2 located in the accommodating chamber 4. 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.
As shown in fig. 1, the metal corrosion protection layer 5 can shield all the areas of the cap 2 located in the accommodating chamber 4, which are the areas indicated by D1, when there is no metal corrosion protection layer 5, the area where the inner side wall of the top plate 21 of the cap 2 directly contacts with the electrolyte is the area D1, the size of the top plate 21 is D2, the area where the sealing ring 7 can shield the inner side wall of the top plate 21 is the area B shown in the drawing, when the metal corrosion protection layer 5 is designed, the metal corrosion protection layer 5 shields all the areas of the cap 2 located in the accommodating chamber 4, and then the size of the metal corrosion protection layer 5 is necessarily greater than or equal to the size of the area D1.
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 that of the top plate 21 but is larger than or equal to all regions of the cap 2 located in the accommodating cavity 4, so that the metal corrosion prevention layer 5 can be better fitted to the inner side wall of the top plate 21.
The size of the metal anticorrosive coating 5 can be larger than or equal to the size of all regions (namely, the D1 region) of the cap 2 in the accommodating cavity 4, and also can be smaller than the size of the D1 region, when the size of the metal anticorrosive coating 5 is smaller than the size of the D1 region, the sealant 6 overflows to the periphery of the metal anticorrosive coating 5 and covers the position where the metal anticorrosive coating 5 does not cover the D1 region, so that the whole D1 region is shielded by the metal anticorrosive coating 5 and the sealant 6, and the corrosion prevention of the cap 2 is realized.
The metal anticorrosive layer 5 and the positive electrode tab 31 are made of the same material. Through setting up metal anticorrosive coating 5 unanimous with anodal ear 31's material, can effectively reduce the probability that metal anticorrosive coating 5 is corroded, extension metal anticorrosive coating 5's life, and then the life of extension whole battery.
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, 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.
Specifically, the cap 2 is cylindrical, the corresponding top plate 21 is circular, the metal anticorrosive coating 5 is also circular, the sealant 6 arranged on one side of the metal anticorrosive coating 5 close to the top plate 21 is annular, and the diameter of the outer ring of the metal anticorrosive coating is equal to or larger than that of the metal anticorrosive coating 5.
When the positive tab 31 is welded, the positive tab 31, the metal anticorrosive layer 5 and the cap 2 are welded into a whole. Through welding positive pole ear 31, metal anticorrosive coating 5 and block 2 as an organic whole, can form the point of an electric conduction at the welding position, reinforcing electric conductivity, the three welds after overlapping and establishing again in addition, can increase welding position's thickness, avoids welding and wears.
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 the inside wall at drain pan 1 tightly. 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.
The sealant 6 between the cap 2 and the metal anticorrosive layer 5 partially overflows out of the metal anticorrosive layer 5 in the hot pressing process. The overflowed sealant 6 can be used as a structure connected with the sealing ring 7. Specifically, after the cap 2 and the bottom case 1 are assembled, the part of the sealing ring 7, which is located on the upper end face of the bottom case 1, is bonded to the metal anticorrosive layer 5 through the overflowing sealant 6, so that secondary sealing is performed between the bottom case 1 and the cap 2, and the sealing performance between the bottom case 1 and the cap 2 is enhanced.
In other embodiments, the bottom case 1 may also be sleeved outside the cap 2, at this time, the inner side wall of the cap 2 is not limited to the top plate 21 provided with the metal corrosion-resistant layer 5, and the part of the second surrounding wall 22 of the cap 2 located in the accommodating cavity 4 is also provided with the metal corrosion-resistant layer 5, so as to protect the cap 2 comprehensively.
In an embodiment, as shown in fig. 2 and 3, 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, and a fastening portion for fastening the sealing ring 7 is formed at a joint of adjacent wall plates. Through set up the toper portion of supporting on first leg 12 and second leg 22, this portion of supporting can compress tightly sealing washer 7 between first leg 12 and second leg 22, is showing the leakproofness that has promoted between drain pan 1 and the block 2, and the shape of the portion of supporting that sets up on first leg 12 and the second leg 22 corresponds each other, so, just can realize good sealed.
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 case 1, an end of the third outer wall plate 223 away from the second outer wall plate 222 is pressed toward the first peripheral wall 12 to be shrunk, so that the third outer wall plate 223 of the assembled and molded cap 2 is inclined toward the inside of the second peripheral 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 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 departing from the end of 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.
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 core 3 may be in the shape of a cylinder, a square cylinder, an elliptic cylinder, or the like, and may 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 side wall of the bottom case 1 to shield the inner side wall of the whole bottom case 1.
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 setting is in 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, the setting is in 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 disposed on the pole piece, the tab may also be disposed at an 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.
Certainly, the number of the tabs on the pole piece is not limited to one, and two or more tabs can be provided, when two or more tabs are arranged on the pole piece, all the tabs are arranged at intervals along the length direction of the pole piece, one tab is arranged at the center of the pole piece in the length direction, and the rest tabs are arranged at intervals on one side or two sides of the tab. Taking five tabs arranged on each pole piece as an example, one tab is arranged at the center of the pole piece in the length direction, and the remaining four tabs are arranged in pairs symmetrically along the center of the pole piece in the length direction.
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 is direct to be drawn forth to coiling formula electricity core 3's outside by coiling formula electricity core 3's axis direction. The extension part of the current collector of the pole piece extends to the outside part of the active material to form the pole lug directly or after bending, so that the process of pole lug welding 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 portion of the winding type battery cell 3 needs to be bent to form the tab, the overlapping position of the extension portion is provided with a reinforcement. Set up extra reinforcement through the coincide position at the extension, the reinforcement can strengthen the intensity of folding 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 invention, the reinforcement is an adhesive tape wrapped around the outside of the overlapping position of the extensions. 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 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 and negative electrode tabs, the positive electrode tabs 31 or the 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 isolation portion extending beyond the end face of the winding type battery cell 3 is not less than 0.75mm. 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 terminal surface of the winding battery cell 3 is not limited to be isolated by the isolation portion, and the terminal surface of the winding battery cell 3 may be isolated by the additional isolation sheets respectively disposed at the two ends of the winding 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. The aluminum foil and the copper foil are both softer than aluminum sheets (strips) or nickel sheets (strips) which are used as materials of the conventional tabs, so that the isolating part is not easy to pierce through the tabs 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 (130-150 ℃) characteristics and/or having high mechanical strength may be used, for example: 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 with the outer peripheral part of the winding type battery cell 3, so that the space for storing the electrolyte by the auxiliary member can be enlarged, and meanwhile, the auxiliary member is conveniently connected with 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 of inner chamber is in the tip of coiling formula electricity core 3, increases the pressure of the electrolyte of inner chamber to coiling formula electricity core 3, more is favorable to the absorption of coiling formula electricity core 3 to 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 the 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 injection process, the accurate injection can be realized only by controlling the electrolyte on the height, so that the accurate control on 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 member directly forms an integral structure with the winding type battery cell 3, 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 outward 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 member. 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 specific manufacturing method of the battery is 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, as shown in FIG. 4, coating a circle of annular sealant 6 on one side surface of the metal anticorrosive coating 5, not coating glue on the middle part of the metal anticorrosive coating 5, and then adhering the metal anticorrosive coating 5 to the inner side wall of the top plate 21 of the cap 2;
step S300, hot-pressing the metal anticorrosive layer 5 to reduce the thickness of the sealant 6 and enable the middle part of the metal anticorrosive layer 5 to be in contact with the top plate 21;
step S400, as shown in fig. 1, the sealing ring 7 is sleeved on the second surrounding wall 22 of the bottom case 1;
step S500, welding a negative electrode tab of the winding type battery cell 3 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 S600, assembling the bottom case 1 and the cap 2, and pressing the lower end of the second surrounding wall 22 of the cap 2 to abut against the sealing ring 7.
Preferably, the battery is a rechargeable battery, and 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 1-8mm.
In the description herein, it is to be understood that the terms "upper" and the like are based on the orientation or positional relationship shown in the drawings, which are for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
In the description herein, references to the term "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 the description, schematic representations of the above terms 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 principles of the present invention have been 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 taken 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 inventive step, and these embodiments will fall within the scope of the present invention.
Claims (8)
1. A battery manufacturing method is characterized in that a metal anticorrosive layer is bonded in a cover cap before a bottom shell and the cover cap of a battery are assembled, then the metal anticorrosive layer is hot-pressed, at least part of the metal anticorrosive layer is in contact with the inner side wall of the cover cap, and a positive lug of a battery cell of the battery is welded with the metal anticorrosive layer;
coating a sealant on one side surface of the metal anticorrosive layer close to the cap, wherein the sealant does not completely cover the metal anticorrosive layer; or the like, or, alternatively,
coating the sealant on the mounting position of the inner side wall of the cover cap corresponding to the metal anticorrosive layer, wherein the mounting position is not completely covered by the sealant;
the sealant is annularly arranged along the periphery of the metal anticorrosive layer.
2. The method for manufacturing a battery according to claim 1, wherein a part of the sealant between the cap and the metal corrosion protection layer overflows out of the metal corrosion protection layer during the hot pressing process.
3. The method for manufacturing the battery according to claim 1, wherein the battery is provided with a containing cavity for containing the battery core, and the metal anticorrosive layer covers all areas of the cap in the containing cavity.
4. The method for manufacturing the battery according to claim 1, wherein the metal corrosion-resistant layer is made of the same material as that of the positive tab.
5. The method of manufacturing a battery according to claim 1, wherein the positive electrode tab, the metal corrosion prevention layer, and the cap are welded together when the positive electrode tab is welded.
6. The battery manufacturing method according to any one of claims 1 to 5, wherein the battery core is placed in the bottom case after a sealing ring is sleeved on the upper end of the bottom case, and the sealing ring is partially attached to the inner side wall of the bottom case and partially attached to the outer side wall of the bottom case.
7. The method for manufacturing a battery according to claim 6, wherein after the metal corrosion-resistant layer is hot-pressed, a part of the sealant between the metal corrosion-resistant layer and the cap overflows out of the metal corrosion-resistant layer, and after the cap and the bottom case are assembled, a part of the sealing ring on the upper end surface of the bottom case is bonded with the metal corrosion-resistant layer through the sealant.
8. A battery, characterized in that the battery is manufactured and molded by the method according to any one of claims 1 to 7, the battery comprises a bottom case, a cap and a battery core, the bottom case and the cap are both made of metal pieces, a containing cavity for containing the battery core is formed between the bottom case and the cap, a metal anticorrosive layer is bonded on the inner side wall of the cap, at least part of the metal anticorrosive layer is in contact with the inner side wall of the cap, and the metal anticorrosive layer is welded with a positive electrode tab of the battery core.
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| CN112349948A (en) * | 2020-11-12 | 2021-02-09 | 大器(深圳)创新科技有限公司 | Novel cylindrical button battery |
| CN112490545A (en) * | 2020-12-03 | 2021-03-12 | 惠州市恒泰科技股份有限公司 | Battery, first shell assembly and preparation process thereof |
| CN112490543A (en) * | 2020-12-03 | 2021-03-12 | 惠州市恒泰科技股份有限公司 | Battery and preparation process thereof |
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