CN102104134B - Pole lug of lithium battery and negative pole structure with same as well as lithium battery - Google Patents
Pole lug of lithium battery and negative pole structure with same as well as lithium battery Download PDFInfo
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- CN102104134B CN102104134B CN2011100304944A CN201110030494A CN102104134B CN 102104134 B CN102104134 B CN 102104134B CN 2011100304944 A CN2011100304944 A CN 2011100304944A CN 201110030494 A CN201110030494 A CN 201110030494A CN 102104134 B CN102104134 B CN 102104134B
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- lug
- projection
- crimp region
- negative plate
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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 relates to a pole lug of a lithium battery and a negative pole structure with the same as well as the lithium battery. The lithium battery is a battery using lithium or a lithium alloy as a negative pole piece; the pole lug is provided with a non-compression joint area and a compression joint area used for being in compression joint with the negative pole piece; the compression joint area is provided with a first protruding part; and the first protruding part comprises at least one first protrusion. Provided with the first protruding part, the pole lug can be compressed into the negative pole piece when contacting with the negative pole piece, thereby enhancing the contact reliability between the pole lug and the negative pole piece.
Description
Technical field
The present invention relates to the disposable lithium-battery field, more specifically, the present invention relates to a kind of lug of lithium battery, negative pole structure and lithium battery with this lug.
Background technology
At battery industry, lithium battery has received more and more people's concern and attention owing to have advantages such as energy density height, voltage is high, operating temperature range is wide, the life-span is long.In more than ten years in the past, lithium battery once having occupied leading position in (not chargeable) and secondary (chargeable) Battery Market, is widely used in the portable electric appts such as mobile phone, notebook computer and digital camera.
In lithium battery, conventional battery of lithium-iron disulphide (following lithium battery or the lithium primary battery of also abbreviating as sometimes) is with ferrous disulfide (FeS
2) be that positive active material, lithium metal (Li) they are the primary cell of electrolyte for negative electrode active material and with the organic electrolyte.Therefore the voltage of this primary cell can reach 1.5V, can substitute alkaline battery commonly used now and uses as the portable energy source of ordinary consumption electronic equipment.In addition; This primary cell also has advantages such as specific energy is big, capacity is high, operating temperature range is wide, the storage time is long; Has interchangeability with widely used alkaline primary battery in the market; Therefore its high-power battery as a new generation just more and more receives people's welcome, and market prospects are boundless.
In the process of making battery of lithium-iron disulphide, at first, with FeS
2Powder is processed slurry with stirring after conductive agent, binding agent etc. mixes; And this slurry is coated on the anodal conductive base and forms anodal; Then positive pole is dried, roll-in, cut to handle and obtain positive plate; Simultaneously, select lithium metal or its of specific dimensions to close ribbon of gold foil as negative plate; Then, the end with lug is connected respectively to positive electrode structure of formation and negative pole structure on positive plate and the negative plate; Then, respectively positive electrode structure, barrier film and negative pole structure are superposeed to form battery; At last, battery is put into battery container, inject electrolyte, obtain battery of lithium-iron disulphide after sealing, cleaning.
In anodal structure aspects, battery producer has taked the whole bag of tricks to guarantee the reliability that is connected between positive plate and the lug.For example; The producer that has has reserved the zone that an end is not coated with in the coating procedure of positive plate, positive plate is rolled into battery after; These uncoated regional centralized together; Tight fit through battery assembling directly contacts the anodal base material of uncoated regional centralized with positive terminal, saved the welding procedure that is electrically connected between pole piece and the terminal; Also have some producers on positive plate, to reserve uncoated zone earlier, on this uncoated zone, draw lug then, use resistance or other modes that lug is connected with positive terminal.Though above-mentioned technology relative complex some, have reliable electrical connection.
Aspect negative pole structure, extensive use at present be that lug is directly contacted and cover layer of protecting part (being generally adhesive tape) to strengthen the contact between the two with negative plate.Though this connected mode is easier, aspect connection reliability, there are some problems.Battery usually will experience end user's hand such as processes such as loading and unloading, vibrations being transported to from producer; In addition, battery in use also possibly impacted, and for example, drops on the floor perhaps experience long vibration etc. at random.The destruction that these all possibly cause inside battery to be electrically connected.Especially in utilizing the existing battery of said method, being connected more easily between negative plate and the lug destroyed, so that battery performance descends even lost efficacy, thereby brings very big trouble to the user, reduced CSAT.
Therefore, this area needs a kind of lithium battery that can keep between negative plate and the lug internal electrical reliably to be connected, thus the quality and the CSAT of raising lithium battery.
Summary of the invention
In the summary of the invention part, introduced the notion of a series of reduced forms, this will further explain in the embodiment part.Summary of the invention part of the present invention does not also mean that key feature and the essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection range of attempting to confirm technical scheme required for protection.
To the connection reliability problem between above-mentioned negative plate of the prior art and the lug; The invention provides a kind of lug of lithium battery; Said lithium battery is for using lithium or the lithium alloy battery as negative plate; A surface of said lug has the crimp region that is used to be crimped on said negative plate, and said crimp region has first jut, and said first jut comprises at least one first projection.
Further, the part of said surface except said crimp region of said lug is non-crimp region; Said lug also has second jut; Said second jut is adjacent with said first jut; Said second jut comprises a plurality of second projections; The height of said second projection all is less than or equal to the height of said first projection, and said second projection of at least a portion is positioned at the intersection of said non-crimp region and said crimp region.
The present invention also provides a kind of negative pole structure of lithium battery; Said negative pole structure comprises lithium system negative plate and above-mentioned lug; Said lug is crimped on the said lithium system negative plate with said crimp region; And embed said lithium system negative plate with said first projection at least, and the height of said first projection is less than the thickness of said lithium system negative plate.
Further, the present invention also provides a kind of lithium battery, and said lithium battery uses ferrous disulfide as positive active material, and said lithium battery comprises above-mentioned negative pole structure.
In sum, at first, lug of the present invention has first projection, so itself and negative plate can be pressed into negative plate contacted the time, thereby strengthens the reliability of contact between the two; And lug of the present invention can also have second projection of highly being less than or equal to first projection, and it is arranged on the intersection of crimp region and non-crimp region, thereby causes the negative plate damage can avoid the bending lug time even break playing the effect of protection negative plate.Negative pole structure of the present invention can reduce the influence that extraneous vibration brings effectively, guarantees to have reliable the connection between negative plate and the lug in the negative pole structure, and can reduce the contact resistance of inside battery, promotes the discharge performance of battery.Lithium battery of the present invention can reduce the influence that extraneous vibration brings effectively, guarantees to have reliable the connection between negative plate and the lug in the negative pole structure, thereby makes battery have preferable quality and long life-span, and then increase customer satisfaction degree.
Description of drawings
Attached drawings of the present invention is used to understand the present invention at this as a part of the present invention.Embodiments of the invention and description thereof have been shown in the accompanying drawing, have been used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 a is depicted as the front view according to the lug of the lithium battery of a preferred embodiment of the invention;
Fig. 1 b is depicted as the side sectional view according to the lug of the lithium battery of a preferred embodiment of the invention;
Fig. 1 c is depicted as the front view of the lug of the lithium battery of another preferred implementation according to the present invention;
Shown in Figure 2 is sketch map according to the negative pole structure of the lithium battery of a preferred embodiment of the invention;
Shown in Figure 3 is to carry out the sketch map of reliability testing according to the negative pole structure of lithium battery of the present invention.
Embodiment
In the description hereinafter, a large amount of concrete details have been provided so that more thorough understanding of the invention is provided.Yet, it will be apparent to one skilled in the art that the present invention can need not one or more these details and be able to enforcement.In other example,, describe for technical characterictics more well known in the art for fear of obscuring with the present invention.
In order thoroughly to understand the present invention, will detailed structure be proposed in following description, so that specify the present invention.Obviously, execution of the present invention is not limited to the specific details that those skilled in the art has the knack of.Preferred embodiment of the present invention is described in detail as follows, yet except these were described in detail, the present invention can also have other execution modes.
It should be noted that employed term only is in order to describe specific embodiment here, but not the intention restriction is according to exemplary embodiment of the present invention.As used herein, only if context spells out in addition, otherwise singulative also is intended to comprise plural form.In addition; It is to be further understood that; When using a technical term " comprising " and/or " comprising " in this manual; It indicates and has said characteristic, integral body, step, operation, element and/or assembly, does not exist or additional one or more other characteristics, integral body, step, operation, element, assembly and/or their combination but do not get rid of.
[lug]
As stated; The invention provides a kind of lug of lithium battery; Said lithium battery is for using lithium or the lithium alloy battery as negative plate; A surface of said lug has the crimp region that is used to be crimped on said negative plate, and said crimp region has first jut, and said first jut comprises at least one first projection.Below with reference to Fig. 1 a ~ 1c, specify concrete structure according to the lug of lithium battery of the present invention.
Fig. 1 a is depicted as the front view according to the lug of the lithium battery of a preferred embodiment of the invention; Fig. 1 b is depicted as the side sectional view according to the lug of the lithium battery of a preferred embodiment of the invention; Fig. 1 c is depicted as the front view of the lug of the lithium battery of another execution mode according to the present invention.
At first; Shown in Fig. 1 a and 1b; A surface of lug 100 is made up of the crimp region that is used to be crimped on the negative plate (not shown) 101 and non-crimp region (being the zone except crimp region 101 on this surface of lug 100), and crimp region 101 and non-crimp region lay respectively at the two ends of lug 100.With regard to the shape of lug 100, be generally bar shaped or " L " shape.Said bar shaped comprises the shape of any length-width ratio greater than 1 (being preferably greater than 1.5).As the instance of bar shaped, the lug shown in Fig. 1 a and the 1b is a rectangle.But its shape is not limited to this, and for example it can be the bar shaped with four fillets.The also not special restriction of " L " shape is as long as be suitable for as the link that connects pole piece and terminal.
As an example, the thickness of lug 100 " d " (the z direction shown in Fig. 1 b) is generally 0.05 ~ 0.50mm, for example, and 0.1mm, 0.3mm, 0.4mm; Be preferably 0.08 ~ 0.20mm.
As an example, when being used for the negative pole structure of lithium battery, lug 100 can be processed greater than the metal or alloy of lithium by hardness, and for example, said lug 100 is processed by at least a material that is selected from aluminium, steel, copper, nickel or its alloy, is preferably processed by nickel plated steel strip.When the hardness of the material of lug during greater than lithium, this lug can be crimped on the lithium system negative plate easily, thereby obtains negative pole structure of the present invention.But, for lug, can select suitable material, be not limited to above-mentioned hardness of enumerating and material according to purposes with structure of the present invention.
As an example, when selecting hardness, can the crimp region of lug of the present invention be contacted with the appropriate location of negative plate greater than the ear pole material of negative plate; Through certain pressure, for example, 0.1 ~ 0.5MPa; Whole with first jut; Perhaps, be pressed into negative plate, thereby obtain to have the negative pole structure that is connected between reliable lug and the pole piece whole parts of first jut with second jut.
For the lug of bar shaped or " L " shape, crimp region 101 only need be positioned at lug on the position a end gets final product, and does not have other restrictions.
Crimp region 101 has first jut 102, and said first jut 102 comprises first projection 103.Said here " first jut " is meant the part that first all projections 103 and surface each other thereof occupy in crimp region 101 (shown in Fig. 1 a 102); This zone is the part of crimp region; Be usually located at position near the lug end, and second projection that does not exist the back literary composition to mention.Under preferred situation, in order to guarantee to be electrically connected reliably lastingly between lug 100 and the negative plate, first jut 102 comprises at least one first projection 103, for example, 16,24,32 etc.The quantity of first projection 103 does not receive special restriction, can set according to the projected area of each first projection itself, and the unit projected area is more little, and quantity is many more.
As an example, in order to guarantee to have reliable the electrical connection between lug 100 and the negative plate, first projection 103 accounts for more than 10% of said crimp region 101 gross areas in whole projected areas of said crimp region 101, for example, and 40%, 60%, 90%; Preferably, first projection 103 accounts for 50% ~ 80% of said crimp region 101 gross areas in whole projected areas of said crimp region 101.
As an example; In order to guarantee to have reliable the electrical connection between lug 100 and the negative plate; The height of first projection 103 (along the z direction shown in Fig. 1 b, i.e. " h " shown in Fig. 1 b) should be high as far as possible, so that it can embed in the negative plate with the darker degree of depth; Thereby strengthen being connected between lug 100 and the negative plate to greatest extent; But the height of first projection 103 can not be too high, in order to avoid this projection makes the edge of negative plate become vulnerable area when negative plate edge embedding negative plate, influences ensuing battery manufacturing process.Preferably, when lug 100 was crimped on the negative plate, there was not first projection 103 in the part that its crimp region is positioned at the negative plate edge; The crimping at negative plate edge can be accomplished by back second jut 104 mentioned of literary composition, in order to avoid cause the edge of negative plate too weak and break.In addition, when being used for negative pole structure, the height of preferred first projection is less than the thickness of negative plate, penetrates avoiding.Therefore the height of first projection 103 can be 0.08 ~ 0.50mm, for example, and 0.2mm, 0.3mm, 0.4mm; Be preferably 0.08 ~ 0.30mm.In addition, can also confirm other sizes of first projection, like length (along the x direction shown in Fig. 1 a) and width (along the y direction shown in Fig. 1 a) according to actual conditions.
It is obvious that to those skilled in the art; Under the instruction of present specification; Can in the light of actual conditions in above-mentioned scope, select suitable numerical value according to the actual size of lug 100 and negative plate, contact area and the degree of reliability of the electrical connection that reaches of expectation between the two.Also it is obvious that to those skilled in the art, also can from the data that are different from above-mentioned scope, select suitable numerical value.
As an example, the projection of first projection 103 on the surface of said crimp region 101 can be arbitrary shapes such as rhombus, circle, ellipse, square, triangle, bar shaped, wherein is preferably rhombus, square and circular, more preferably rhombus.
Further; Except the size that requires first projection 103 can guarantee to realize to connect reliably, the profile of also preferred first projection 103 was the convex surface that does not have wedge angle, and formation penetrates when avoiding being crimped on the negative plate; That is to say; Under preferred situation, the surface of first projection 103 is a convex surface, and the every bit on this convex surface all can be led continuously.Such convex surface can be that short of wedge angle (every bit on the face all can be led continuously) gets final product by a kind of, two or three composite surface that constitute in ruled surface, bent line curved surface and/or the plane.
Further, said first projection 103 (or first jut 102) should preferably be positioned near with the contacted end of negative plate; In addition, said first projection 103 can be arranged on the crimp region 101 with any-mode, for example, makes first projection 103 at an end on lug surface randomly, but preferably, first projection 103 is the matrix-style arrangement or is cellular mode arranges.That is to say; First projection 103 can be earlier along the x direction shown in Fig. 1 a near from left to right being arranged in order with the contacted end of negative plate; And then be arranged in order along the y direction shown in Fig. 1 a; First projection 103 between the different rows can align (promptly being matrix-style), also can be staggered (promptly being cellular mode, shown in Fig. 1 a).It will be appreciated by persons skilled in the art that first projection with Any shape all can strengthen the bonding strength between lug and the negative plate.Again for example, shown in Fig. 1 c, make for ease, and make lug stressed more even, first projection 103 can be striated and arrange (or claiming wavy arrangement), for example single stripe or many stripeds on the surface of said crimp region 101.That is, first projection 103 can be on the surface of crimp region 101, keep at a certain distance away along the y direction each other, from left to right (along the x direction) be distributed in the striated projection on the lug 100.
As an example, said first jut 102 (first projection 103) can form through mechanical stamping method or other similar approach.With the mechanical stamping method is example, and lug to be processed is placed on the pressing equipment, and punching press institute applied pressure is adjusted into 0.3 ~ 1.2MPa, and for example 0.5MPa carries out the lug that punching press obtains having first jut to lug.
As an example, can also leave the crude non-projection area 106 of a part between the end of first jut 102 and lug 100, to satisfy the location needs that add man-hour.
Further, in order further to strengthen being connected between lug and the negative plate, also for fear of because the existence of first the jut 102 and edge of anticathode sheet causes damage, lug 100 can also have second jut 104.This second jut 104 is adjacent with first jut 102.Said second jut 104 has a plurality of second projections 105.
Further, when second jut 104 was set, preferred said second projection 105 of at least a portion was positioned at the intersection of said non-crimp region and said crimp region 101, to strengthen the lug intensity of this intersection, shown in Fig. 1 a.Its reason is: as stated, for the reliability that guarantees to connect, need the first all projections 103 is crimped on negative plate; But in the subsequent technique of battery manufacture process; Possibly also need bend lug 100 welding, and the position of bending generally is positioned at the Strength Changes place on lug surface, promptly with negative terminal; In when bending, the place that intensity is significantly less than other parts on the same surface is bent easily.At this moment, if at the intersection of said non-crimp region and said crimp region 101 second projection is not set, then may make bending occur in the edge (corresponding to the edge of negative plate) of first jut 102, this just might damage negative plate; When being provided with said second projection 105 of second jut 104 and at least a portion and being positioned at the intersection of said non-crimp region and said crimp region 101; Because the existence of second projection 105 can strengthen the intensity of this intersection; Therefore (this edge is not provided with any projection can to make bending be easier to occur in the edge of second jut 104; And the edge away from negative plate), thus can avoid the anticathode sheet to cause damage.
As stated, under the situation that second jut 104 is set, only need said second projection 105 of at least a portion to be positioned at the intersection of said non-crimp region and said crimp region 101, can realize above-mentioned effect.The quantity of this part second projection 105 does not receive special restriction, only needs its projection and this intersection to overlap and can strengthen its bending strength.Putting before this, as an example, can second projection 105 of the part in second jut 104 be arranged on crimp region 101, another part second projection 105 is arranged on non-crimp region.This part second projection 105 that is arranged on crimp region 101 can play the effect that connects negative plate as first projection 103; Second projection that is arranged on non-crimp region then plays the effect that strengthens the lug bending strength.In order further to guarantee to have reliable the electrical connection between lug 100 and the negative plate; And avoid lug 100 in the bending of negative plate edge, second projection 105 that is positioned at crimp region 101 can account for 5 ~ 20% of said crimp region 101 gross areas in whole projected areas of said crimp region 101, for example; 8%; 15%, 18%, be preferably 5% ~ 10%.More preferably; In second projection 105 of non-crimp region should be between 0.2 ~ 0.4mm, to guarantee that lug 100 can be at the intersection between crimp region 101 and the non-crimp region by bending away from the distance of the end of crimp region 101 1 sides and the intersection between crimp region 101 and the non-crimp region.
In order not influence the function of first projection 103, the height of said second projection 105 should be less than or equal to said first projection 103.Under preferred situation; The height that is distributed in each second projection 105 in second jut 104 can reduce along the direction of crimp region 101 to non-crimp region with the position difference gradually; Under preferred situation, can be reduced to 0 along crimp region 101 gradually to the direction of non-crimp region with the difference of position.For example, the height of each second projection 105 (along the z direction shown in Fig. 1 b, i.e. " h " shown in Fig. 1 b) can be 0 ~ 0.5mm.It is obvious that to those skilled in the art; Can be according to the actual size of lug 100 and negative plate, the contact area between the two, the size of first projection 103; And the degree of reliability of the electrical connection that reaches of expectation, in the light of actual conditions in above-mentioned scope, select suitable numerical value.Also it is obvious that to those skilled in the art, also can from the data that are different from above-mentioned scope, select suitable numerical value.
As an example; The projection of second projection 105 on the surface of the surface of said crimp region 101 and said non-crimp region can be arbitrary shapes such as rhombus, circle, ellipse, square, triangle, bar shaped; Wherein be preferably rhombus, square and circular, more preferably rhombus.
Further; Except the size of needs second projection 105 can guarantee to realize to connect reliably, the profile of also preferred second projection 105 was preferably the convex surface that does not have wedge angle, and formation penetrates when avoiding being crimped on the negative plate; That is to say; Under preferred situation, the surface of second projection 105 is a convex surface, and the every bit on this convex surface all can be led continuously.Such convex surface can be that short of wedge angle (every bit on the face all can be led continuously) gets final product by a kind of, two or three composite surface that constitute in ruled surface, bent line curved surface and/or the plane.
Further, said second projection 105 should be preferably adjacent with first projection 103; In addition, said second projection 105 can be arranged on the crimp region 101 with any-mode, for example, makes second projection 105 on the lug surface randomly, but preferably, second projection 105 is the matrix-style arrangement or is honeycomb arrangement.That is to say; Second projection 105 can be earlier along the x direction shown in Fig. 1 a near from left to right being arranged in order with the contacted end of negative plate; And then be arranged in order along the y direction shown in Fig. 1 a; Second projection 105 between the different rows can align (promptly being matrix-style), also can be staggered (promptly being cellular mode, shown in Fig. 1 a).It will be appreciated by persons skilled in the art that second projection with Any shape all can realize above-mentioned purpose.Again for example, shown in Fig. 1 c, make for ease, and make lug stressed more even, second projection 105 can also be striated and arrange (or claiming wavy arrangement), for example single stripe or many stripeds.That is, second projection 105 can be keep at a certain distance away along the y direction each other, from left to right (along the x direction) be distributed in the striated projection on the lug 100.
As an example, said second jut 104 (second projection 105) can form through mechanical stamping method or other similar approach.With the mechanical stamping method is example, and lug to be processed is placed on the pressing equipment, and punching press institute applied pressure is adjusted into 0.3 ~ 1.2MPa, and for example 0.5MPa carries out the lug that punching press obtains having second jut to lug.
Further, according to the concrete structure of pressing equipment, said first jut 102 can form respectively with said second jut 104, also can be simultaneously integrally formed.
Under preferred situation, second projection 105 and first projection 103 are of similar shape, arrangement mode and manufacture method, can simplify technology like this.
In sum, lug of the present invention has first jut, therefore can be through its and negative plate crimping be pressed into said negative plate, thus strengthen the reliability that contacts between the two; Second; Lug of the present invention can also have second jut different with the height of first jut; The part of said second jut is used to be pressed into the reliability of negative plate to contact between further enhancing lug and the negative plate, thereby another part of said second jut causes the lug fracture to play the effect of protection negative plate when avoiding the bending lug; The 3rd, lug of the present invention can obtain through the mechanical stamping method, so manufacture method is simple, and is with low cost.
[negative pole structure]
Below with reference to Fig. 2, specify the concrete structure of the negative pole structure of lithium battery according to the preferred embodiment of the present invention.Shown in Figure 2 is sketch map according to the negative pole structure of the lithium battery of a preferred embodiment of the invention.
As shown in Figure 2, the negative pole structure 200 of lithium battery comprises negative plate 201 and lug 202.
As an example, negative plate 201 is lithium system negative plate, that is, use lithium or lithium alloy as active material, and its thickness is generally 0.1 ~ 0.5mm, 0.2mm for example, 0.3mm, 0.4mm etc.
Lug 202 shown in Figure 2 is the described lug of the above-mentioned preferred implementation of the present invention (referring to Fig. 1 a, 1b and 1c and mentioned above); Its concrete structure and corresponding preferred implementation can be with reference to mentioned above; Repeat no more at this, below only the execution mode of this negative pole structure is described.
As an example, when assembling negative plate 201 and lug 202, the surface of crimp region with negative plate 201 contacted; And apply certain pressure; For example, 0.1 ~ 0.5MPa makes the whole of first jut; Perhaps the part of whole and second jut of first jut embeds negative plate 201, thereby reaches tight contact the between negative plate 201 and the lug 202.
As an example, for strengthening being connected and preventing possible internal short-circuit danger between negative plate 201 and the lug 202, the negative pole structure 200 of battery also comprises the guard member 203 of at least one sheet.Described guard member 203 is used to protect the crimping of lug 202 and negative plate 201.Guard member 203 be bonded on the first area at least and on the said lithium system negative plate with this first area adjacent areas on; This first area be lug 202 another surface (with the surface of surface opposite, i.e. up one side among Fig. 2) with crimp region and non-crimp region with the corresponding zone of said crimp region; Preferred said guard member 203 covers the whole of said first area at least, thereby so that pole piece and membrane coil are being prevented that around a time-out edge diaphragm of lug from playing a protective role.Further; Guard member 203 can also be bonded at least a portion of second area; This second area be positioned at said lithium system negative plate with by the another side of the surface opposite of said lug crimping, and be on the said lithium system negative plate with the corresponding zone of said crimp region.When on guard member 203 covers second area with bonding mode at least a portion and the negative plate 201 and when being connected these two parts, can play fixation to the crimping of lug 202.
As an example, the viscose glue on the flexible parent metal that guard member 203 comprises sheet and the single face that is coated in said flexible parent metal, said viscose glue is used for said bonding.Wherein, base material is made up of at least a material that is selected from polyethylene, polypropylene, vulcanized polyethylene, nomex, glass cloth, polyester film, non-textile fiber, cotton, cellulose acetate, the crape etc.Viscose glue is made up of at least a material that is selected from rubber, synthetic rubber, acrylate glue, the silicones.But above base material and viscose glue combination in any.
In sum, the negative pole structure of the present invention that has an above-mentioned structure can prevent effectively that contingent first projection and/or second projection from penetrating negative plate and the fault that causes; Simultaneously, can also reduce the influence that extraneous vibration brings, guarantee to have reliable the connection between negative plate and the lug in the negative pole structure; In addition, negative pole structure of the present invention has connection closely, thereby has reduced the contact resistance of inside battery, has promoted the discharge performance of battery.
[battery of lithium-iron disulphide]
Below specify lithium battery according to a preferred embodiment of the invention.
Lithium battery of the present invention uses ferrous disulfide as positive active material; It can comprise: positive electrode structure, negative pole structure, barrier film and electrolyte.
Positive electrode structure comprises positive plate and positive pole ear.Further, positive plate uses ferrous disulfide as active material; Can use various flexible sheet materials as anodal base material, for example aluminium foil.
Negative pole structure is the above-mentioned negative pole structure of the present invention, and its structure repeats no more.
Barrier film can be that material is the micro-porous film of PE (polyethylene), PP (polypropylene) or its combination.
Further; When making; With positive electrode structure, negative pole structure and barrier film according to the sequential volume of positive electrode structure, barrier film, negative pole structure, barrier film around together to form battery, inject electrolyte after battery is put into battery container, seal and process battery; Wherein, said electrolyte can form through lithium salts is dissolved in the organic solvent.
It will be appreciated by persons skilled in the art that except negative pole structure of the present invention the miscellaneous part of above-mentioned lithium battery can adopt any known structure, be not limited to the above-mentioned instance of enumerating.
Owing to have above-mentioned negative pole structure; Battery of the present invention can reduce the influence that extraneous vibration brings effectively; Guarantee to have reliable the connection between negative plate and the lug in the negative pole structure, thereby make battery have preferable quality and long life-span, and then increase customer satisfaction degree.
Below come the technical scheme of requirement of the present invention protection is made more detailed description through embodiment.Need to prove that these embodiment are exemplary, the application's protection range is not had the qualification effect.
Embodiment
Embodiment 1-4
Below specific embodiment through cylindrical AA GND structure negative pole structure of the present invention is further described.
The negative plate of the cylindrical AA GND structure of present embodiment adopts pure metal lithium paper tinsel band, and length is 300mm, and width is 40mm, and thickness is 0.16mm.Lug adopts the nickel plated steel strip of bar shaped, and length is 25mm, and width is 3.5mm, and thickness is 0.1mm, and wherein crimp region accounts for 30% (edge that is crimp region is positioned on the lug from the nearest about 8mm of end margin place) of whole lug area.The base material of guard member adopts polypropylene base, and its length is 23mm, and width is 7.2mm, and thickness is 0.1mm, and the material of viscose glue is a synthetic rubber, constitutes adhesive tape thus.
Then, make first jut with the mode of mechanical stamping in the crimp region of lug, wherein, mechanical stamping institute applied pressure is 0.5MPa.Said first jut comprises 24 first projections that shape is identical, and the cellular mode that is rule is arranged (promptly shown in Fig. 1 a); First projection accounts for 50% of the said crimp region gross area in whole projected areas of crimp region; The height of first projection is 0.12mm (less than the negative plate thickness of 0.16mm).
Among the embodiment 1, first projection be projected as rhombus; Among the embodiment 2, being projected as of first projection is square; Among the embodiment 3, first projection be projected as circle.First projection of each embodiment is convex surface, its no wedge angle in surface.
The above lug for preparing is contacted with negative plate, and apply the pressure of 0.3MPa above that, above-mentioned first projection is pressed into negative plate.Form complete negative pole structure thus, wherein the product of embodiment 1-3 is called sample A, sample B and sample C respectively.
In embodiment 4; Use above-mentioned guard member to cover on first area and the said lithium system negative plate among the sample A and this first area adjacent areas; So that two zones link together, wherein, another surface that this first area is said lug with the corresponding zone of said crimp region; Form complete negative pole structure thus, be referred to as sample D.
Be electrically connected for the negative pole structure that the foregoing description 1-3 is described has preferably, hereinafter is a comparison other with existing negative pole structure (sample E), carries out reliability testing.Wherein, existing negative pole structure forms for the guard member among the use embodiment 4 directly is bonded together the lug (first projection is not set) of same specification and negative plate.
Fig. 3 has shown the sketch map of method of testing, wherein, the expression of 301 in the negative pole structure 300 negative plate, 302 expression lugs, F representes the direction of pulling force.Specifically; When test; Apply a pulling force as shown in Figure 3 (about 2N estimates that the active force that concussion brought in the actual use is less than this numerical value) to negative pole structure, observe the surface state of negative plate then and actual pulling force application time before taking place to break away from.If the wide variety of materials lithium in the negative plate is bonded on first projection be drawn out, perhaps crimp region is broken and a large amount of negative plate material is bonded on the lug, explains that then lug and being connected of negative plate are reliable.On the other hand, whether firm negative pole structure opposing tensile force f and time of not breaking away from also be to weigh to connect a standard.Test result shows, and is as shown in table 1.
Table 1
| Sample | First projection | The negative plate state | Time (second) |
| A | Rhombus | Break | 5 |
| B | Square | 15/24 | 3 |
| C | Circular | 8/24 | 3 |
| E | Do not have | Excellent | 3 |
Wherein, the negative plate of sample A breaks after tensile force f continues 5 seconds, shows that its connection is the most firm; The negative plate of sample B has the lithium of 15 positions to be pulled up on tensile force f is after lasting 3 seconds, shows that its connection is also comparatively firm, but is inferior to sample A; Equally, sample C has the lithium of 8 positions to be pulled up after tensile force f is after lasting 3 seconds, and syndeton is inferior to sample B; The lug of sample E is pulled up after pulling force continues 3 seconds, but the surface is excellent.However, the such negative pole structure of decent article E is easy in use take place because of vibration the horizontal disengaging (referring to following reliability testing 2) of lug and negative plate, does not therefore meet the requirement in useful life of lithium battery.Among sample A, B and the C; Although do not use guard member, its connection is by the adhesiveness of inside of cathode of lithium body, weighs with the tension time; Its tension effect (effect of the pulling force on the opposing F direction) is suitable basically with the sample E that uses guard member, even better.
In addition; According to The above results; Reliability with negative pole structure of rhombus first projection is superior to having the reliability of the negative pole structure of square first projection; Further be superior to having the reliability of the negative pole structure of circular first projection, further, the reliability of the existing negative pole structure that only is superior to connecting through adhesive tape.
Reliability testing 2
Do horizontal tractive test with sample A, D and E.Fig. 3 has shown the sketch map of method of testing, wherein, the expression of 301 in the negative pole structure 300 negative plate, 302 expression lugs, H representes the direction of pulling force.Specifically, when test, apply a pulling force as shown in Figure 3 (about 2N), observe the surface state of negative plate then and actual pulling force application time is before taking place to break away to negative pole structure.If the wide variety of materials lithium in the negative plate is bonded on first projection be drawn out, perhaps crimp region is broken and a large amount of negative plate material is bonded on the lug, explains that then lug and being connected of negative plate are reliable.On the other hand, whether firm negative pole structure opposing pulling force H and time of not breaking away from also be to weigh to connect a major criterion.Test result shows, and is as shown in table 2.
Table 2
| Sample | First projection | Guard member | The negative plate state | Time (second) |
| A | Rhombus | Do not have | Break | 5 |
| D | Rhombus | Have | Break | 6 |
| E | Do not have | Have | Excellent | 2 |
Wherein, the negative plate of sample A and D breaks, and the tension time is longer, shows that its connection is all very firm; Although the negative plate of sample E surface is excellent, its tension time is the shortest, shows that it connects weak effect.Usually, in the use of lithium battery, owing to can receive various vibrations, the such negative pole structure of decent article E is easy to take place the horizontal disengaging of lug and negative plate, does not therefore meet the requirement in useful life of lithium battery.
Embodiment 5
Adopt lug, negative plate and the guard member the same with embodiment 1; Different is; Also utilize mechanical stamping on lug from making 24 second projections (constituting second jut) with the first jut position adjacent, its arrangement is similar with first projection; Also be cellular; Maximum height is 0.11mm, and is reduced to 0 from the crimp region of lug gradually to non-crimp region (zone on this surface except that crimp region), and wherein crimp region and non-crimp region respectively have 12 second projections; The part that second projection is positioned at crimp region accounts for 10% of the crimp region gross area in whole projected areas of crimp region, and crimp region accounts for 50% of this total surface area of lug.In addition, the intersection of crimp region and non-crimp region is distributed with 2 second projections, and it highly is 0.06mm.
Employing is crimped on above-mentioned lug with embodiment 1 the same mode with negative plate, thereby constitutes negative pole structure.
Then with hand with the direction bending of the end that is positioned at non-crimp region of lug to negative plate, the result finds that the bending point is positioned at the position that second jut finishes, this position is 3mm from the edge of negative plate, so the edge of negative plate is without damage.The result shows, damage negative plate edge when the lug with second projection can prevent the lug bending.
As shown in table 3, below respectively with two groups of data declaration second juts to the protection negative plate injury-free benefit of bringing.The A Battery pack is the battery (having caused the damage of battery pole piece when that is to say the lug bending) that does not have second jut, and the B Battery pack is the battery that has the second jut lug, has effectively protected pole piece injury-free during bending.
Table 3
| ? | The test sample number/only | The short circuit battery number/only |
| The A Battery pack | 1000 | 17 |
| The B Battery pack | 1000 | 0 |
[beneficial effect of the present invention]
In sum, at first, lug of the present invention has first projection, so itself and negative plate can be pressed into negative plate contacted the time, thereby strengthens the reliability of contact between the two; And lug of the present invention can also have second projection of highly being less than or equal to first projection, and it is arranged on the intersection of crimp region and non-crimp region, thereby causes the negative plate damage can avoid the bending lug time even break playing the effect of protection negative plate.Negative pole structure of the present invention can reduce the influence that extraneous vibration brings effectively, guarantees to have reliable the connection between negative plate and the lug in the negative pole structure, and can reduce the contact resistance of inside battery, promotes the discharge performance of battery.Lithium battery of the present invention can reduce the influence that extraneous vibration brings effectively, guarantees to have reliable the connection between negative plate and the lug in the negative pole structure, thereby makes battery have preferable quality and long life-span, and then increase customer satisfaction degree.
The present invention is illustrated through the foregoing description, but should be understood that, the foregoing description just is used for for example and illustrative purposes, but not is intended to the present invention is limited in the described scope of embodiments.It will be appreciated by persons skilled in the art that in addition the present invention is not limited to the foregoing description, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modifications all drop in the present invention's scope required for protection.Protection scope of the present invention is defined by appended claims book and equivalent scope thereof.
Claims (34)
1. the lug of a lithium battery; Said lithium battery is for using lithium or the lithium alloy battery as negative plate; A surface of said lug has the crimp region that is used to be crimped on said negative plate; Said crimp region has first jut, it is characterized in that, said first jut comprises at least one first projection; The part of said surface except said crimp region of said lug is non-crimp region; Said lug also has second jut; Said second jut is adjacent with said first jut; Said second jut comprises a plurality of second projections; The height of said second projection all is less than or equal to the height of said first projection, and said second projection of at least a portion is positioned at the intersection of said non-crimp region and said crimp region.
2. lug according to claim 1 is characterized in that, said first projection accounts for more than 10% of the said crimp region gross area in whole projected areas of said crimp region.
3. lug according to claim 2 is characterized in that, said first projection accounts for 50% ~ 80% of the said crimp region gross area in whole projected areas of said crimp region.
4. lug according to claim 1 is characterized in that, the height of said first projection is 0.08 ~ 0.50mm.
5. lug according to claim 4 is characterized in that, the height of said first projection is 0.08 ~ 0.30mm.
6. lug according to claim 1 is characterized in that, said first projection is projected as rhombus, circle, ellipse, square, triangle or bar shaped the surface of said crimp region.
7. lug according to claim 1 is characterized in that, said first projection is matrix-style and arranges, is cellular mode and arrange or be striated and arrange on said crimp region.
8. lug according to claim 1 is characterized in that, said first projection is a convex surface, and the every bit on the said convex surface all can be led continuously.
9. lug according to claim 1 is characterized in that, said first projection forms through the mechanical stamping method.
10. lug according to claim 9 is characterized in that, the punching press institute applied pressure in the said mechanical stamping method is 0.3 ~ 1.2MPa.
11. lug according to claim 1 is characterized in that, said lug be shaped as bar shaped or " L " shape.
12. lug according to claim 1 is characterized in that, the thickness of said lug is 0.05 ~ 0.50mm.
13. lug according to claim 12 is characterized in that, the thickness of said lug is 0.08 ~ 0.20mm.
14. lug according to claim 1 is characterized in that, said lug is processed greater than the metal or alloy of lithium by hardness.
15. lug according to claim 14 is characterized in that, said lug is processed by at least a material that is selected from aluminium, steel, copper, nickel or its alloy.
16. lug according to claim 14 is characterized in that, said lug is processed by nickel plated steel strip.
17. lug according to claim 1 is characterized in that, said a plurality of second projections height separately reduces to the direction of said non-crimp region along said crimp region gradually.
18. lug according to claim 1 is characterized in that, the part that said second projection is positioned at said crimp region accounts for 5 ~ 20% of the said crimp region gross area in whole projected areas of said crimp region.
19. lug according to claim 1 is characterized in that, said second projection is identical with the projection on the surface of said non-crimp region in the projection on the surface of said crimp region, and is rhombus, circle, ellipse, square, triangle or bar shaped.
20. lug according to claim 1 is characterized in that, said second projection is matrix-style and arranges, is cellular mode and arrange or be striated and arrange on said crimp region and said non-crimp region.
21. lug according to claim 1 is characterized in that, said second projection is a convex surface, and the every bit on the said convex surface all can be led continuously.
22. lug according to claim 1 is characterized in that, said second projection forms through the mechanical stamping method.
23. lug according to claim 17 is characterized in that, said a plurality of second projections height separately is reduced to 0 along said crimp region to the direction of said non-crimp region gradually, and is not equal to 0.
24. lug according to claim 22 is characterized in that, the punching press institute applied pressure in the said mechanical stamping method is 0.3 ~ 1.2MPa.
25. the negative pole structure of a lithium battery; It is characterized in that; Said negative pole structure comprises each described lug in lithium system negative plate and the aforesaid right requirement; Said lug is crimped on the said lithium system negative plate with said crimp region, and embeds said lithium system negative plate with said first projection at least, and the height of said first projection is less than the thickness of said lithium system negative plate.
26. negative pole structure according to claim 25 is characterized in that, the thickness of said lithium system negative plate is 0.1 ~ 0.5mm.
27. negative pole structure according to claim 25 is characterized in that, the used pressure of said crimping is 0.1 ~ 0.5MPa.
28. negative pole structure according to claim 25; It is characterized in that; Said negative pole structure also comprises the guard member of sheet; Said guard member be bonded on the first area at least and on the said lithium system negative plate with said first area adjacent areas on, said first area is said lug another surface with the corresponding zone of said crimp region.
29. negative pole structure according to claim 28; It is characterized in that; Said guard member also is bonded at least a portion of second area; Said second area be positioned at said lithium system negative plate with by the another side of the surface opposite of said lug crimping, and be on the said lithium system negative plate with the corresponding zone of said crimp region.
30. negative pole structure according to claim 28 is characterized in that, the viscose glue on the flexible parent metal that said guard member comprises sheet and the single face that is coated in said flexible parent metal, and said viscose glue is used for said bonding.
31. negative pole structure according to claim 30; It is characterized in that said base material is made up of at least a material that is selected from polyethylene, vulcanized polyethylene, polypropylene, nomex, glass cloth, polyester film, non woven fibre, cotton, cellulose acetate or the crape.
32. negative pole structure according to claim 30 is characterized in that, said viscose glue is made up of at least a material that is selected from rubber, acrylate glue or the silicones.
33. a lithium battery, said lithium battery use ferrous disulfide as positive active material, it is characterized in that said lithium battery comprises each described negative pole structure among the claim 25-32.
34. lithium battery according to claim 33 is characterized in that, said lithium battery is equipped with through lithium salts being dissolved in the electrolyte that forms in the organic solvent.
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| CN102290554A (en) * | 2011-08-01 | 2011-12-21 | 曙鹏科技（深圳）有限公司 | Negative lug and battery |
| KR101381674B1 (en) | 2011-08-12 | 2014-04-04 | 주식회사 엘지화학 | Jelly-Roll of Improved Productivity and Battery Cell Comprising the Same |
| CN104347841B (en) * | 2014-11-07 | 2016-09-14 | 宁波超霸能源有限公司 | The negative lug of disposable lithium-battery and and lithium cathode sheet between attachment structure |
| FR3034259B1 (en) | 2015-03-27 | 2021-08-27 | Accumulateurs Fixes | MECHANICAL TREATMENT PROCESS OF AN ELECTRICAL CONNECTION PART FOR AN ELECTROCHEMICAL GENERATOR |
| CN205645969U (en) * | 2016-03-08 | 2016-10-12 | 宁德时代新能源科技股份有限公司 | Secondary cell utmost point ear and secondary cell |
| KR102407054B1 (en) * | 2017-03-16 | 2022-06-10 | 삼성전자 주식회사 | Battery including electrode tab having flat surface |
| CN107790907A (en) * | 2017-11-11 | 2018-03-13 | 无锡先导智能装备股份有限公司 | One kind auxiliary welding method, device and welding winding integrated machine |
| CN112490594B (en) * | 2019-08-23 | 2023-02-28 | 东莞新能安科技有限公司 | Tab, pole piece and battery |
| CN113178668A (en) * | 2020-01-08 | 2021-07-27 | 东莞新能德科技有限公司 | Battery structure, electronic device, and method for manufacturing battery structure |
| WO2021179256A1 (en) * | 2020-03-12 | 2021-09-16 | 宁德新能源科技有限公司 | Electrode assembly and battery |
| CN113328210B (en) * | 2021-05-27 | 2022-09-27 | 贵州梅岭电源有限公司 | Lithium metal negative plate of lithium battery and preparation method thereof |
| CN113328211B (en) * | 2021-05-27 | 2022-09-27 | 贵州梅岭电源有限公司 | High-energy-density lithium primary battery negative plate and preparation method thereof |
| CN216413217U (en) * | 2021-07-05 | 2022-04-29 | 托马斯·吉哈德·维尔海姆·达米兹 | Lithium ion battery |
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| JPH103900A (en) * | 1996-06-14 | 1998-01-06 | Toshiba Battery Co Ltd | Secondary battery and manufacture thereof |
| JP2002260628A (en) * | 2001-03-06 | 2002-09-13 | Toshiba Battery Co Ltd | Positive electrode for alkaline secondary battery, manufacturing method of positive electrode for the alkaline secondary battery, and the alkaline secondary battery |
| CN201117716Y (en) * | 2007-11-15 | 2008-09-17 | 比亚迪股份有限公司 | Electrode sheet and battery including same |
| CN201498546U (en) * | 2009-03-19 | 2010-06-02 | 江海洋 | Structure used for welding pole piece and pole lug by planar welding column and used for rechargeable battery |
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