CN1765558A - Welded article production method and pedestal - Google Patents

Abstract

A metallic plate and an electrode of, e.g., a polymer lithium ion secondary cell are welded to each other securely so as to further improve the reliability and durability. An upper metallic plate (7a) and a lower metallic plate (9a) of a positive plate are so welded to an electrode (3) of the positive plate that they vertically sandwich the electrode (3). Similarly, an upper metallic plate (7b) and a lower metallic plate (9b) are so welded to an electrode (5) of a negative plate that they sandwich the electrode (5). Thus defective electric resistance welding is prevented.

Description

Make the method and the bearing of weldment

The present invention is application number the dividing an application for the Chinese patent application of " battery, its manufacture method, make the method and the bearing of weldment " that be No.01803391.1, denomination of invention.

Technical field

The present invention relates to have the method and the bearing of the battery of the structure of the sheet metal that is welded to electrode, the cell manufacturing method that comprises welding step, manufacturing weldment.

Background technology

Lithium rechargeable battery has been used as a kind of power supply that can charge and discharge in mobile phone and the portable electric appts that is included in recent years.In addition, it is well-known for example using solid-state non-liquefaction electrolyte and do not have the battery of leak of liquid danger.This lithium rechargeable battery has various external shapes, and the battery that is generally used for the mancarried electronic aid of notebook type or notepad type and mobile phone flattened type normally.In the lithium rechargeable battery of this platypelloid type,, respectively plate electrode is arranged on positive pole/end and the negative pole/end in order between secondary cell main body and outside, to produce continuous current.

The terminal of positive electrode is approximately the thin aluminium of 0.07-0.1 millimeter or acieral by thickness usually and is formed by hobbing or the like method, in order to satisfy the structural limitations in the part that is connected to the secondary battery cell main body, limit and reduce the thickness of whole secondary cell, and guarantee high electric conductivity, further the sheet metal that is connected with outside terminal (being also referred to as tap) is soldered to blank area usually.As this sheet metal, for example nickel-base alloy has low resistance, good mechanical strength and good durable material like this and is guaranteed and being electrically connected and mechanical connection of outside with (according to the intensity of material) by suitable use.In addition, for example the thickness of this thin slice is set to 0.1 millimeter or more usually.

Sheet metal and electrode normally weld by resistance welded or method for ultrasound welding, and are starved of and guarantee firm welding, thereby when using second electrode or the like, sheet metal can be not separated or be broken away from from electrode.

But, in the situation of resistance welded, the problem of failure welding between above-mentioned electrode and the sheet metal can appear.

First reason of resistance welded difficulty is to have difference between the fusing point of al and ni.That is to say that the terminal of positive electrode is formed by aluminium or acieral, thereby its fusing point is 660-700 ℃.On the other hand, sheet metal is formed by the material with high mechanical properties and relative higher melt, thereby its fusing point for example is 1400-1455 ℃ under the situation of nickel based metal.Therefore, the difference between electrode and the sheet metal fusing point reaches 800 ℃ approximately.In addition, the boiling point of aluminium is 2486 ℃, and the boiling point of nickel is 2731 ℃, and their boiling point also difference is very big.

Second reason of resistance welded difficulty is to form oxide-film (aluminium oxide) on the aluminium flake surface.The fusing point of aluminium oxide is up to 2050 ℃, between aluminium flake and nickel sheet in the situation of resistance welded, need be under the temperature of about 2050 ℃ or higher welding portion this thin oxide-film of fusing.At this, be commonly called aluminium oxide at the lip-deep alumite of aluminium, and its chemical formula is Al2O3.

Therefore, if being set to make welding temperature, welding condition can arrive the fusing point of the made sheet metal of Ni-based aluminium or the like or higher temperature, welding under the situation of many electrodes and sheet metal with conventional method for resistance welding, the aluminium or the acieral of this electrode are completely melted on large tracts of land, make this sheet thickness be surpassed the size of normal/common solder joint by Durchgangshohle.Correspondingly, molten metal is scattered, and after the aluminium flake of welding portion arrives fusing point phenomenons such as strong aluminium steam and metal sputtering takes place, and this causes producing cavity and failure welding in this part.

In addition, be adjusted to when welding temperature below the fusing point of the such sheet metal of nickel based metal for example,, cavity or the so bad welding of deposite metal sputter can not occur for example in electrode, producing to avoid the entire plate fusing of electrode.But, owing to do not melt, therefore do not form the normal solder joint of nickel based metal and aluminium based metal at the lip-deep nickel based metal of sheet metal, only the vestige of aluminium based metal welding is retained on the cross section after welding, and the bad welding of insecure welding occurs.As a result, for example peeling off this electrode of test shows and sheet metal separates drawing than specific stretching under the much lower strength of experiment stress easily.

Then, the various conditions that resistance welded need be set wherein can be from forming normal solder joint at sheet metal and to the composition surface the electrode of periphery to produce a distribution of welding temperature.But this condition setting needs very accurate inevitably because for example between the fusing point of the metal of the such electrode of the metal of the such sheet metal of nickel-base alloy and for example acieral difference too big.In addition, the joint of electrode tip is rotten and distortion along with continuing of welding, thereby is very difficult to the setting of the accurate welding condition of the above-mentioned the best of maintenance in the large-scale production of reality, therefore is difficult to reduce to occur the probability of bad welding.

In addition, if the positive electricity end bar is made of the nickel sheet that is similar to the extreme bar of negative electricity, then can carry out resistance welded.But if this nickel sheet constitutes the positive electricity end bar, then electrochemical reaction and dissolving may take place in the inside of battery in this nickel sheet, so this is worthless.

As indicated above, there is technical difficulty in the resistance welded of carrying out flake aluminum and nickel sheet, and especially, the welding of positive electricity end and wiring board is normally carried out by ultrasonic bonding.

But there are the following problems in ultrasonic bonding.At first, the oscillation intensity of ultrasonic bonding and amplitude time that scope is set is less, be difficult to the welding condition that keeps best.Secondly, be difficult to stablize weld strength, and occur the failure welding of certain ratio in the large-scale production processing that is used for making large-tonnage product.Because, in ultrasonic bonding, only extremely thin alloy-layer produces on the interface between electrode and the sheet metal, owing to increase two lip-deep roughness, thereby they only are in weak connection status from the teeth outwards in many cases, and are difficult to realize for this face of weld required electricity and mechanical firm welding.In addition, the natural oxide film that produces on the surface of the sheet metal made by aluminium or acieral forms obstacle, and because the weak welding effect that ultra-sonic welded is carried out becomes more weak.And if as indicated above electrode and sheet metal are carried out weak welding, and then the resistance on its part uprises, and its unfavorable result reduces from the voltage that secondary battery cell transmits by electrode and sheet metal, and perhaps electric current is restricted.

The 3rd, ultrasonic welding system is more expensive more than resistance welding equipment, and the cost of equipment that is used for large-scale production uprises.The 4th, ultrasonic welding system is bigger than resistance welding equipment, and needs bigger plant area.So just need development to be used for welding the metal of foil and nickel sheet by method for resistance welding.

For example, the ultrasonic wave of high-energy-density welds for a long time to need this method for ultrasound welding use to have more, to produce stronger welded condition.But, if carry out welding for a long time with this intense ultrasonic wave, be similar to the situation of above-mentioned resistance welded, then in the scope that surpasses the welding desirable strength, melt, and the advantage of ultra-sonic welded itself can not embody fully by having the made electrode of thin thickness and low-melting acieral.For example, if carry out too strong ultra-sonic welded then be cut off by the partial electrode that acieral is made.

In addition, although utilize the welding method of scolding tin also to be considered to a kind of except welding welding sheet metal electricity and the method that is mechanically fixed on the electrode, natural oxide film as indicated above (aluminium oxide) produces on the electrode surface made by acieral, therefore wellability and the tack for scolding tin forms obstacle, and the scolding tin welding becomes difficult.Before the scolding tin welding overcomes above-mentioned obstacle effectively, consider the surface of electrode is applied effective solder flux in advance, be used to handle this surperficial natural oxide film.But, cause after welding for example fierce dose composition to be retained in result on electrode or the sheet metal inevitably, this causes remaining composition may reduce the persistence of the coupling part between electrode and the sheet metal significantly unfriendly.For example, in the process of using this secondary cell, the residue composition may corrode this electrode gradually, and this finally can cause damaging, coming off or the like.In addition, because the scolding tin welding can make the flake aluminum that constitutes positive electricity end become high temperature, and the temperature of inside battery also uprises, and causes the battery quality variation, therefore welds positive electricity end with the scolding tin welding method and wiring board is not preferred.

The present invention considers the problems referred to above and makes.The purpose of this invention is to provide a kind of method of making battery, comprise by resistance welded handle be welded in polymerization lithium rechargeable battery or the like by made electrode such as aluminium or acieral and step by made sheet metal such as nickel utmost point alloy, comprising the firm resistance welded step of welding of electrode and sheet metal, it is eliminated owing to cause the generation or the so bad Welding Problems of sputter in cavity at the splash-proofing sputtering metal of welding portion, and a kind of battery with height reliability and durability is provided, wherein come firm weld metal sheet and electrode by said method.

Another object of the present invention provides a kind of method of making weldment, is wherein easily welded together by highly reliable method for resistance welding by the made two or more objects of different materials, and a kind of bearing that is used for this method is provided.

Summary of the invention

Battery according to the present invention comprises: the secondary battery cell with charging and discharging function; Pellet electrode, it is connected to this secondary battery cell, and conducts electricity in charging and discharge process; And a plurality of sheet metals, it is soldered to this electrode, has the fusing point higher than this electrode, and perhaps thicker and have identical fusing point than this electrode, wherein at least one sheet metal is soldered to each side of this electrode.

In addition, battery according to the present invention comprises: the secondary battery cell with charging and discharging function; Pellet electrode, it is connected to this secondary battery cell and conducts electricity in charging and discharge process; And sheet metal, it is soldered to this electrode, have the fusing point higher than this electrode, perhaps thicker and have an identical fusing point than this electrode, wherein this sheet metal has and is similar to the part that single sheet is bent to horseshoe-shape, this electrode is sandwiched between the two ends of about horseshoe-shape, and at least one end at these two ends is welded to this electrode.

A kind of method of making according to battery of the present invention, comprising following steps: higher or thicker than this pellet electrode and weld metal sheet that have an identical fusing point is welded to the pellet electrode that is connected with secondary cell than this pellet electrode fusing point, this electrode conducts electricity in secondary cell charge and discharge process, wherein by resistance welded processing or other welding method at least one sheet metal is welded to each side of this electrode in the step of this sheet metal of welding.

In addition, manufacturing comprises the steps: that according to the another kind of method of battery of the present invention higher or thicker than this pellet electrode and weld metal sheet that have an identical fusing point is welded to the pellet electrode that is connected with secondary cell than this pellet electrode fusing point, this electrode conducts electricity in secondary cell charge and discharge process, wherein in the step of this sheet metal of welding, this sheet metal has and is similar to the part that single sheet is bent to horseshoe-shape, and welding step comprises the step of this electrode holder between the two ends of about horseshoe-shape, and to carrying out resistance welded between at least one end at these two ends and this electrode.

A kind of method of making according to weldment of the present invention, place on the bearing by the made soldered two or more objects of wanting of different materials comprising handle, and push down welding rod and carry out resistance welded, wherein bearing placement surface is made by the fusing point refractory metal higher than the fusing point of two or more objects that will weld at least.

Bearing according to the present invention is a bearing of placing the object that will weld in welding process, and at least one placement surface is made by the metal that has than 1455 ℃ of higher fusing points.

According to the present invention battery with and manufacture method, be sandwiched between the sheet metal by for example aluminium or the relatively low made electrode of metal material of the such fusing point of acieral, the fusing point of this sheet metal is higher than the fusing point of electrode, and by welding temperature being elevated to the welding temperature that makes in the face of the high temperature of the sheet metal surface melting of electrode, so that together form alloy by the surface of resistance welded and this electrode.Be enough to pass its thickness even be molten at this moment by the made electrode of the fusing point metal material lower than sheet metal, because the upside and the downside of the appropriate section of electrode are sandwiched between the sheet metal, so the not deposite metal of electrode can not spill or be splashed to the outside.And this sheet metal is soldered to the both sides up and down of a plate electrode, and mechanical strength is higher and the electrical connection zone only is welded to the ordinary circumstance of both sides up and down greater than sheet metal.

According to another kind of Battery And Its Manufacturing Methods of the present invention, this sheet metal forms by single sheet (thin slice) is bent into about horseshoe-shape in addition, and this electrode holder is between the two ends of horseshoe-shape.Therefore, in resistance welded, do not need respectively sheet metal to be located and is fixed on the step of the upside and the downside of electrode.

Method according to manufacturing weldment of the present invention, at least the placement surface of this bearing is made by the refractory metal higher than the fusing point of soldered object, this is avoided, and this bearing together melts with the object that will weld when welding, thereby avoids wanting soldered object to be bonded on this bearing.In addition, because the radiating effect of bearing prevents to want soldered object exceedingly to be melted.In addition, because welding current also by this bearing, therefore has more welding current to flow through the welding portion of the object of wanting soldered.

Identical with the method for manufacturing weldment of the present invention, according to bearing of the present invention, this placement surface is higher than 1455 ℃ metal by fusing point and is constituted at least, thereby prevents that soldered object from adhering to and excess molten, and big welding current flows through this welding portion.

From following description, other purpose of the present invention, characteristics and advantage will be clearer.

Description of drawings

Fig. 1 is the schematic diagram that illustrates according to the basic structure of the lithium ion battery of first embodiment of the invention.

Fig. 2 illustrates to be used at the resistance welded device of straight line (directly) spot welding system of the step of first embodiment of the invention welding electrode and sheet metal and by the schematic diagram of an example of its performed welding operation.

Fig. 3 illustrates to be used at the resistance welded device of the straight line spot welding system of the step of second embodiment of the invention welding electrode and sheet metal and by the schematic diagram of an example of its performed welding operation.

Fig. 4 is the schematic diagram that illustrates according to the schematic construction of the lithium rechargeable battery of second embodiment of the invention.

Fig. 5 be illustrate the step that is used for welding electrode and sheet metal serial spot welding system the resistance welded device and by the schematic diagram of an example of its performed welding operation.

Fig. 6 is the schematic diagram that illustrates according to the basic structure of the lithium rechargeable battery of third embodiment of the invention.

Fig. 7 is the schematic diagram that is illustrated in the state of electrode in the secondary cell shown in Fig. 5 and sheet metal welding.

Fig. 8 be illustrate sheet metal by two separation than flakelet constituted, the terminal of positive electrode has the tip portion of a band slit and want soldered part to be divided into the schematic diagram of schematic construction of the lithium rechargeable battery in two zones.

Fig. 9 is the schematic diagram that the state that last sheet metal in the lithium rechargeable battery with the schematic construction shown in Fig. 8 and following sheet metal and positive electrode terminal weld is shown.

Figure 10 is the schematic diagram that illustrates according to the basic structure of the lithium rechargeable battery of fourth embodiment of the invention.

Figure 11 is the schematic diagram that the basic structure of printed substrate is shown.

Figure 12 illustrates the schematic diagram that is comprised in the schematic construction in the lithium rechargeable battery as the printed substrate of holding circuit, and this lithium ion battery has the structure that last sheet metal and following sheet metal are welded to electrode.

Figure 13 is the schematic diagram that illustrates according to the schematic construction of the lithium rechargeable battery of fifth embodiment of the invention.

Figure 14 illustrates by resistance welded to handle the schematic diagram of the state of the terminal of sheet metal on the plus end that is installed in advance on the print circuit board surface and positive electrode welding.

Figure 15 illustrates the schematic diagram that is drilled with the platform that having of through hole be used for the plus end that sheet metal connects and the printed substrate of the platform that is used for the negative terminal that sheet metal is connected respectively.

Figure 16 illustrates preliminary election is installed in the following sheet metal on the lip-deep plus end of printed substrate, the terminal of positive electrode and last sheet metal is handled the state that welds together by resistance welded schematic diagram.

Figure 17 illustrates to use the schematic diagram of the technology shown in Figure 16 by the schematic construction of the lithium rechargeable battery of resistance welded step acquisition.

Figure 18 is the schematic diagram that illustrates according to the schematic construction of the lithium rechargeable battery of sixth embodiment of the invention.

Figure 19 A to 19F is the various forms of schematic diagrames that the welding rod that can be applicable to resistance welded is shown.

Figure 20 is the perspective view that illustrates according to the method for the manufacturing weldment of seventh embodiment of the invention and used welding equipment thereof.

Figure 21 is the perspective view that a kind of modification of the welding equipment shown in Figure 20 is shown.

Figure 22 is the perspective view that a kind of modification of the welding equipment shown in Figure 21 is shown.

Figure 23 A to 23F is the elevational view that is illustrated in the pointed shape of the welding rod in the welding equipment shown in Figure 20.

Figure 24 illustrates the perspective view that the method for using the manufacturing weldment shown in Figure 20 is made the method for battery.

Figure 25 is the cross sectional view of the battery of the line I-I intercepting in Figure 24.

Figure 26 is a kind of perspective view of modification that the method for the manufacturing battery shown in Figure 24 is shown.

Figure 27 is the light micrograph according to the welding mark of the aluminium flake of example 11 of the present invention.

Figure 28 is the light micrograph according to the state of the bearing of example 11 of the present invention.

Figure 29 is the light micrograph according to the state after divesting of example 11 of the present invention.

Figure 30 is the light micrograph according to the welding mark of the aluminium flake of example 12 of the present invention.

Figure 31 is the light micrograph according to the state of the bearing of example 12 of the present invention.

Figure 32 is the light micrograph according to the state after divesting of example 12 of the present invention.

Figure 33 is the light micrograph according to the welding mark of the aluminium flake of comparison example 11.

Figure 34 is the light micrograph according to the state of the bearing of comparison example 11.

Figure 35 is the light micrograph according to the state after divesting of comparison example 11.

Figure 36 is the light micrograph according to the welding mark of the aluminium flake of comparison example 12.

Figure 37 is the light micrograph according to the state of the bearing of comparison example 12.

Figure 38 is the light micrograph according to the state after divesting of comparison example 12.

The specific embodiment

Describe embodiments of the invention below with reference to accompanying drawings in detail.In addition, lithium rechargeable battery is to embody by the manufacture method that comprises the resistance welded step according to an embodiment of the invention, thereby hereinafter each embodiment is together described this battery and method thereof.

[first embodiment]

Fig. 1 illustrates the schematic construction according to the lithium rechargeable battery of first embodiment of the invention.

This lithium rechargeable battery has a major part, comprising the terminal 5 of the terminal 3 of secondary battery cell 1, positive electrode, negative electrode, on the plus end sheet metal 7a and following sheet metal 9a and on the negative terminal sheet metal 7b and following sheet metal 9b.In fact the major part that has these parts is covered by the such coating material of the folded film of for example aluminium, and this coating material is raised in the drawings, to be clearly shown that internal structure.In addition, for convenience's sake, place sheet metal sheet metal 7a and 7b and following sheet metal 9a and 9b on this is called as respectively of upside and downside according to the vertical direction of figure, needless to say, can reverse vertical relation, as long as this structure has the sheet metal of the both sides that are welded to each electrode that is clipped between them respectively.

Secondary battery cell for example is to use the electrolytical so-called polymerization type lithium ion battery of solid polymerization.Consider and the balance of internal structure that the terminal 3 of positive electrode is made by aluminium or acieral in this polymerization type lithium ion secondary battery cell 1 usually.If the terminal of positive electrode 3 is made by the material that is different from aluminium or acieral, some shortcomings then appear usually.For example, this material may have and the different electromotive force of positive colelctor electrode in secondary battery cell 1 inside, perhaps be dissolved in this electrolyte, so aluminium or acieral preferably is used as the terminal 3 of positive electrode.In addition, preferably be applied terminal 5 by nickel or the made material of nickel-base alloy into negative electrode.

Sheet metal 7a and following sheet metal 9a on the plus end each, and sheet metal 7b and following sheet metal 9b are by nickel or the made sheet metal of nickel-base alloy on the negative terminal each, terminal 5 than the terminal 3 of positive electrode or negative electrode is thicker, and has high mechanical strength and good electrical conductivity.Following sheet metal 9a on any negative terminal and 9b have the terminal 3 that is welded to positive electrode or negative electrode one of corresponding tip portion of terminal 5 vertically end, and the other end that forms the broad shape is used as and is used for the outside terminal that connects. Sheet metal 7a and 7b are welded to the upper surface of tip portion of the terminal 5 of the terminal 3 of positive electrode and negative electrode respectively on the positive and negative terminal, and its covering comprises the major part in zone of the terminal 5 of the terminal 3 that is desirably in the positive electrode that welds in the resistance welded process or negative electrode.

As indicated above, sheet metal 7a and following sheet metal 9a are welded on the above and below of the terminal 3 that will be clipped in the positive electrode between them respectively on the plus end, and are welded on the above and below of the terminal 5 that will be clipped in the negative electrode between them respectively at the upper and lower sheet metal 7b on the negative terminal and 9b.Therefore, as mentioned below, in the above-mentioned situation of resistance welded, can eliminate the generation of bad welding situation, in addition, can increase and go up electroplating equipment wielding machine intensity and the electric conductivity that sheet metal 7a and 7b and following sheet metal 9a and 9b are welded to the terminal 5 of the terminal 3 of the positive electrode in the lithium rechargeable battery of manufacturing and negative electrode respectively.As a result, can realize that further increase is as the reliability and the durability of the lithium rechargeable battery of product.

Fig. 2 illustrate with the above-mentioned basic element of character welding electrode of lithium rechargeable battery and sheet metal step the resistance welded device with and an example of the welding operation carried out.

Resistance welded device 200 has by electric welding control appliance 201 and utmost point bolt (pole bolt) major part that 202a and 202b constituted.Electric welding control appliance 201 comprises: the electric current-producing device (not shown), and direct current transistor system for example, the electric charge that wherein is accumulated to large capacitor is discharged by this field-effect transistor; The DC converter system wherein uses so-called DC converter to control the dutycycle and the frequency thereof of output voltage and output current, perhaps uses the AC power supply system that is set to the preset frequency oscillator.Be provided to pad from the electric energy of electric current-producing device output by utmost point bolt 202a and 202b.

In the situation of direct current transistor system, by being applied on the object that will weld at the duration of work longer than other system, less relatively electric energy carries out resistance welded, for example, the output voltage when resistance welded is 0.5-3V, and be the 5-300 millisecond weld interval.In addition, in the situation of DC converter system, owing to compare with direct current transistor system can be with higher precision the longer time control output voltage and output current, therefore can in the resistance welded process, make output current remain on a fixed value.Therefore, according to this DC converter system, can more accurately make the temperature of pad be in required numerical value than other system, thereby can stablize welded condition.In the DC converter system, when resistance welded, output voltage is 0.5-2V, and for example be the 5-200 millisecond weld interval.

This utmost point bolt 202a and 202b for example can use cylinder or semi-round ball shape usually by cylinder, cuboid, semi-round ball, circular cone or trapezoidal such end shape.

In the resistance welded device, on the upper surface of the terminal 3 by following sheet metal 7a being placed positive electrode, in addition following sheet metal 9a is placed on the lower surface, with certain pressure this utmost point bolt 202a and 202b are pressed to from upper and lower surface respectively and want soldered object, and apply the predetermined current amount with predetermined voltage at preset time, thereby carry out resistance welded.At this moment, preferably the position adjustments of pushing down utmost point bolt 202a and 202b on the straight line that from the upside to the downside, forms.Make can to by the terminal 3 of positive electrode, go up each object that will weld that sheet metal 7a and following sheet metal 9a constituted a position (point) go up and carry out spot welding, perhaps can be in the execution spot welding of two or more positions.By carrying out spot welding two positions, this welding becomes more firm, and can prevent the terminal 3 of positive electrode and mechanical shaking of last sheet metal 7a and following sheet metal 9a or the like, and the status of electrically connecting between them is better then.

When predetermined voltage being applied to up and down utmost point bolt 202a and 202b, the electric current that flows to down utmost point bolt 202b from last utmost point bolt 202a is sheet metal 7a, anodal terminal 3 and following sheet metal 9a on the direction of thickness is passed through in order.Then, in 3 times sheet metal 9a of terminal of last sheet metal 7a, positive electrode, produce heat, concentrate on the part that flows through electric current, the very fast quiltization of this part, the nickel alloy of the acieral of the terminal 3 of positive electrode and last sheet metal 7a and following sheet metal 9a is melted and mixes and forms new alloy, realizes hard solder like this.At this, the fusing point of the acieral of the terminal 3 of positive electrode is approximately 660 ℃, and the fusing point of going up the nickel-base alloy of sheet metal 7a and following sheet metal 9a is approximately 1455 ℃, that is to say that the difference between this fusing point is approximately 800 ℃.In order to form the aspect of new alloy, apply from this utmost point bolt and be applicable to the electric energy that forms alloy by dystectic nickel-base alloy of fusing and acieral (it comprises aluminium simple substance or the like).Therefore the temperature of utmost point bolt 202a and contacted this part of 202b becomes 1500 ℃ or higher.

Under this high temperature, acieral is molten into liquid state fully.Therefore, in the conventional, electric-resistance welding of routine, utmost point bolt 202a and 202b terminal 3 direct and by the made positive electrode of acieral contacts, the acieral sputter of being melted by the utmost point bolt 202a and 202b is opened fully, occur bad welding then, for example, be melted part by Durchgangshohle, perhaps this welded condition becomes fragile, and makes faint applied external force can cause the separation of this welding portion.

But,, have on the upper and lower surface of terminal 3 that dystectic sheet metal 7a of going up and following sheet metal 9a place positive electrode respectively by thick nickel-base alloy is made, and the terminal 3 of positive electrode is sandwiched between them according to the method for the resistance welded of present embodiment.Therefore, even the acieral of the terminal of positive electrode 3 is molten into liquid state fully on thickness direction, last sheet metal 7a and following sheet metal 9a can prevent that (prevention) this melt is splashed to the outside.

In addition, the boiling point of the acieral of the terminal 3 of positive electrode is approximately 2480 ℃, and under such high temperature, Rong Hua acieral may seethe with excitement and sputter fiercely fully.But, method according to the resistance welded of present embodiment, corresponding to directly contacting with following sheet metal 9a with last sheet metal 7a at this utmost point bolt, by corresponding to the mating surface between utmost point bolt 202a and last sheet metal 7a, at the terminal 3 of positive electrode and the mating surface between the following sheet metal 9a, and the resistance in the following mating surface between sheet metal 9a and the utmost point bolt 202b, flow to the terminal 3 of positive electrode indirectly by the heat that welding current produced.In addition, utmost point bolt 202a and 202b directly do not contact with the terminal 3 of positive electrode, thereby when welding, produce the heat savings, and because the acieral of the fusing of the terminal 3 of positive electrode attached on utmost point bolt 202a and the 202b, therefore can prevent the loss of melt portions.Therefore, can reduce the alloy sputter that the acieral of the terminal 3 of positive electrode is heated to this high temperature and causes, therefore prevent the acieral sputter or the like of fusing fully of the terminal 3 of positive electrode.In addition, directly the pressure of the welding portion below utmost point bolt is higher, thereby boiling point also uprises, so acieral is difficult to boiling.At this, can be at the heat Q of welding portion by formula Q=I ²* R represents that wherein R is the resistance of all mating surfaces, and I is a welding current.

At this, on the surface of acieral, produce extremely thin natural oxide film (aluminium oxide) usually.As indicated above, when temperature be set for example be 1500 ℃ of welding resistance, the aluminium oxide of natural oxide film by with comprise and be blended in the liquid acieral, and be not melted, because its fusing point is 2050 ℃.But this can not cause difficulty to the formation of the new alloy layer that forms acieral and nickel-base alloy, and can obtain reliable and firm welding.

In addition, by pushing down utmost point bolt 402a and 402b from the both sides up and down of wanting soldered object, and be created on the thickness direction electric current by the object that will weld, and the resistance welded device 400 that uses direct spot welding system as shown in Figure 2, the electric current that flows through sheet metal 7a is almost identical with the electric current that flows through following sheet metal 9a, and almost can correspondingly be provided with and optimize the welding condition at upper and lower sides.

In addition, can also realize by different metal material made last sheet metal 7a and following sheet metal 9a.For example, last sheet metal 7a can be made by ferrous alloy, and sheet metal 9a is made by nickel-base alloy, perhaps opposite down, and last sheet metal 7a is made by nickel-base alloy, and sheet metal 9a is made by ferrous alloy down.

Although in the description of above welding step, described in detail to the terminal 3 of positive electrode and on sheet metal 7a and following sheet metal 9a carry out the situation of welding, needless to say can also adopt the welding of terminal 5 and the last sheet metal 7b and the following sheet metal 9b of constructed execution negative electrode as indicated above.

[second embodiment]

Fig. 4 illustrates the schematic construction according to the lithium rechargeable battery of second embodiment of the invention.In this embodiment, the parts identical with first embodiment are represented by identical label, and omit description of them or difference only is described.The 3rd embodiment and following embodiment also describe in a like fashion.

Lithium rechargeable battery has a major part, comprising the terminal 3 of secondary battery cell 1, positive electrode, the terminal 5 of negative electrode, the sheet metal 13 on sheet metal on the plus end 11 and negative terminal.In these parts, identical among the terminal 3 of secondary battery cell 1, positive electrode and the terminal 5 of negative electrode and first embodiment.

Sheet metal 13 on sheet metal on the plus end 11 and negative terminal is to form by carrying out profile cut or bending or conversion process to one by nickel or the made sheet metal of nickel-base alloy, terminal 5 than the terminal 3 of positive electrode or negative electrode is thicker, and has high mechanical strength and good electrical conductivity.

Each sheet metal 11 and 13 on plus end and negative terminal has vertical end of the horseshoe-shape of being bent into, wherein the tip portion of the terminal 3 of positive electrode is welded as and is clipped in by in the gap between two opposite ends in the crooked horseshoe-shape that obtains, and the other end forms the shape of broad, to be used as the outside terminal that connects.

Sheet metal 11 on plus end is difficult to soldered, thereby the tip portion of the terminal of positive electrode 3 can be clipped in the inside of horseshoe-shape is included in the positive electrode in the zone that will be melted in the resistance welded with covering the big zone of terminal 3, and as mentioned below this can be eliminated in terminal 3 resistance welded of sheet metal 11 and positive electrode on plus end and produce bad welding.In addition, can be increased in the mechanism's intensity and the electric conductivity of the combined structure of the terminal 3 of the sheet metal on plus end 11 and positive electrode in the second electrode of manufacturing.As a result, can realize further increasing reliability of products and durability.In addition, identical with the welding of plus end, when the terminal 5 of sheet metal on negative terminal 13 and negative electrode welds, also can realize above-mentioned effect.

In having the lithium rechargeable battery of above-mentioned schematic construction, the terminal 3 of positive electrode can be carried out by using identical resistance welded device 200 as shown in Figure 2 with the welding of sheet metal 13 with the terminal 5 of the welding of sheet metal 11 and negative electrode.More specifically, the tip portion of the terminal 3 by keeping positive electrode is sandwiched in the state in the part of horseshoe-shape of the end that forms sheet metal 11, and apply the electric current of scheduled volume with predetermined voltage at preset time, and push down this utmost point bolt 202a and 202b from the both sides up and down of the sheet metal 11 of horseshoe-shape respectively with predetermined pressure, thereby the execution resistance welded, as shown in Figure 3.Can on a position of every group of electrode and sheet metal, carry out, perhaps can on two or more positions, carry out this spot welding.

According to the method for resistance welding of second embodiment, the terminal of positive electrode 3 is clipped in sheet metal 11 inside, wherein has dystectic thick nickel-base alloy and is bent and becomes horseshoe-shape.Therefore, even the acieral of the terminal of positive electrode 3 is molten into liquid state fully on thickness direction, two opposite ends that form the sheet metal 11 of horseshoe-shape can stop this melt and spill or be splashed to the outside.In addition, can guarantee more to stop that the acieral of fusing is splashed on the side face directions of terminal 3 of positive electrode in the part on the closed side on the horse-hof shape surface of sheet metal 11.In addition, in the part on the open side of horse-hof shape, when the acieral of fusing is not in fluidized state, can guarantee to prevent that the acieral that melts is splashed on the in-plane of sheet metal by the surface tension and the pressure of pulling back on the closed side part of liquid phase.

In addition, the boiling point of the acieral of the terminal 3 of positive electrode is approximately 2480 ℃, and under such high temperature, the acieral of fusing seethes with excitement fully.The utmost point bolt 202a and the 202b that arrive high temperature by accumulation of heat contact with the upper and lower side of the sheet metal 11 that is treated to horseshoe-shape, and owing to flow to positive electrode terminal 3 indirectly by sheet metal 11, thereby cause generating heat by the welding current of the composition surface between the sheet metal 11 of utmost point bolt 202a and this utmost point bolt 202a below and sheet metal 11 and the composition surface of the terminal 3 of positive electrode.Should be noted that utmost point bolt 202a does not directly contact with positive electrode terminal 3 with utmost point bolt 202b.In this manner, reduce that the acieral of the terminal 3 of positive electrode is heated to the such high temperature of boiling, therefore avoid the acieral that melts fully of the terminal 3 of positive electrode to spill, sputter or the like.

In addition, because sheet metal 11 and 13 is by becoming a thin nickel-base alloy bending tablet horseshoe-shape to form, two ends clamping the terminal 5 of the terminal 3 of positive electrode and negative electrode from above-below direction are not to be separated from each other like that to the last sheet metal 7a of first embodiment and 7b and time sheet metal 9a and 9b respectively.Therefore, only finish the preparation of welding in the gap of the horseshoe-shape by the terminal 3 of positive electrode being installed in such sheet metal, so its advantage is to make the welding preparation process simplify (preliminary treatment that is used to weld) more.

In addition, can produce electric current, on thickness direction, pass through to want soldered object, by pushing down utmost point bolt 202a and 202b from the upper and lower sides of wanting soldered object as shown in Figure 3, therefore the electric current that flows through sheet metal 11 and 13 top is almost with identical by its underpart electric current, and almost can correspondingly be provided with and optimize the welding condition of upper and lower sides, can reduce reactive current.

In addition, shown in an example among Fig. 5, in the welding of the resistance welded device 400 that passes through the so-called serial spot welding system of use, wherein be respectively applied for two utmost point bolt 402a of positive and negative terminal and the 402b placement that is parallel to each other, these two utmost point bolt 402a and 402b contact with the upper surface of wanting soldered object, therefore the electric current when welding by horseshoe-shape sheet metal 11 and 13 last slice, the upper surface of the terminal 5 of the terminal 3 of positive electrode and negative electrode.Therefore, do not have the sheet metal 11 of sufficient electric current by horseshoe-shape and the lower surface of the terminal 5 of the terminal 3 of 13 following and positive electrode and negative electrode, and in this case, can not obtain the firm welding on such downside.But, slice extend to down sheet on each of sheet metal 11 and 13 horseshoe-shape and become single sheet.Therefore, even the welding at downside is bad, by at least one of sheet metal 11 and 13 last slice be welded to the upper surface of the terminal 5 of the terminal 3 of positive electrode and negative electrode respectively securely, can reduce sheet metal 11 and 13 respectively to the possibility of terminal 5 failure weldings of the terminal 3 of positive electrode and negative electrode.

In addition, carry out in the welding at the resistance welded device 400 by the using system spot welding system, bearing 405 is positioned at the object below of wanting soldered usually.As this bearing, for example copper product, acid bronze alloy, platinum, platinum base alloy, nickel, nickel-base alloy, titanium, titanium-base alloy, chromium, chromium-base alloy, zinc, zinc-containing alloy, barium, brium-base alloy or the like are optional.Perhaps except mentioned above, can also use for example alloy, copper, the chrome copper that the aluminium oxide distribution strengthens or the acid bronze alloy of copper, calcium, chromium, titanium or barium with surface that is attached to the platinum thin slice.

[the 3rd embodiment]

Fig. 6 illustrates the schematic construction according to the lithium rechargeable battery of third embodiment of the invention.

This lithium rechargeable battery has a major part, comprising secondary battery cell 1, have the slit-shaped otch tip portion positive electrode terminal 3, be similar to the terminal 5 of the negative electrode of tip portion, a sheet metal 15 on plus end with slit-shaped otch, its tip portion is bent into horseshoe-shape and slice has slit-shaped otch and the sheet metal on negative terminal 17 on it, and it has on the tip portion that is bent into horseshoe-shape similarly and its and slice to have the slit-shaped otch.

In this lithium rechargeable battery, the terminal 3 of positive electrode and sheet metal 15 usefulness method for resistance welding are being welded, and in the step that the terminal 5 of negative electrode and sheet metal 17 usefulness method for resistance welding are welded, can carry out reliable welding by the resistance welded device 400 that uses serial spot welding system as shown in Figure 5.That is to say, as shown in Figure 7, by contacting with utmost point bolt 402a by one of two zones that slit separated, and another zone contacts with utmost point bolt 402b, when being provided for the electric current of resistance welded, even electric current will by sheet metal 15 last slice and short circuit, electric current at this moment be positioned at central authorities slit stops.The result, electric current leads to the opposite side (negative terminal) of utmost point bolt 402b from the side (plus end) of utmost point bolt 402a, in order by the zone on last slice a side of sheet metal 15, zone on terminal 3 one sides of positive electrode, be positioned at a part of following of the sheet metal 15 of utmost point bolt 402a below, bearing 405, be positioned at a part of following of the sheet metal 15 of utmost point bolt 402b below, zone on the opposite side of the terminal of the terminal 3 of the positive electrode of being cut apart by slit, and the zone on last slice the opposite side of the sheet metal of being cut apart by slit 15, and the terminal 3 of welding positive electrode and sheet metal 15 required heats are produced by the resistance in current path.In this manner, even when using the resistance welded device of serial spot welding system, can be reliably and carry out the welding of the terminal 3 and the sheet metal 15 of positive electrode simply.

At this, such slit is arranged between the terminal 3 of sheet metal 15 and positive electrode, and can also be used for described in first embodiment situation of terminal 3 welding of two sheet metal 7a and 7b and positive electrode by the technology that the resistance welded device that uses serial spot welding system welds.That is to say, as shown in Figure 8, when last sheet metal 7a was divided into two less thin slice 71a and 72a, also each tip portion at the terminal 5 of the terminal 3 of positive electrode and negative electrode provided a slit, and wants soldered part be divided into two part 31a and 32a.Also in the situation of this shape, as shown in Figure 9, when being provided for the electric current of resistance welded when contacting by last sheet metal 71a that utmost point bolt 402a and 402b are separated with two respectively and 72a, for example this electric current leads to utmost point bolt 402b (negative terminal) on the opposite side from the utmost point bolt 402a (plus end) on the side, pass through a thin slice 71a of last sheet metal in order, a part 31a of the terminal 3 of positive electrode, be positioned at the part of the sheet metal 9a of utmost point bolt 402a below, bearing 405, be positioned at the branch of the sheet metal 9a of utmost point bolt 402b below, terminal 3 another part 32a of the positive electrode of cutting apart by slit, and another thin slice 72a that goes up sheet metal, and by the resistance in a system power path produce be used on terminal 3 welding of sheet metal 71a and 72a and positive electrode, and the terminal 3 of positive electrode and sheet metal 9a welded required heat.Even so when the terminal 3 of going up sheet metal 71a and 72a, positive electrode by the resistance welded device welding of the serial spot welding system of use and following sheet metal 9a, can reliably weld with carrying out simply.

In addition, although be described in detail in resistance welded on the plus end according to Fig. 7 and 9 hereinbefore, particularly, the terminal 3 of positive electrode and the welding of sheet metal 15 needless to say can also be carried out the welding of the terminal 5 of negative electrode by identical welding method.

[the 4th embodiment]

Figure 10 illustrates the schematic construction according to the lithium rechargeable battery of fourth embodiment of the invention.

This lithium rechargeable battery has a kind of structure; as as described in a second embodiment wherein the tip portion sheet metal 11 and 13 that is bent into horseshoe-shape be welded to the terminal 3 of positive electrode and the terminal 5 of negative electrode respectively, and these sheet metals 11 and 13 are soldered to the printed substrate 100 of holding circuit.

As shown in Figure 11; on printed substrate 100, form predetermined wired circuit pattern 101; and circuit part 103 is installed on this wiring board; constituting the so-called protection circuit, its function is to prevent that secondary battery cell 1 charged, charged by excessive electric current and discharge, discharged or the like by too low voltage by excessive voltage.

More specifically, on the surface of printed substrate 100, the platform 107 that is provided with the platform (land) 105 of the plus end that is used for the sheet metal connection and is used for the negative terminal of sheet metal connection, be provided for the platform 109 that the positive outside terminal in conjunction with positive electrode connects in addition and be used for the platform 111 that the negative outside terminal in conjunction with negative electrode is connected, it is connected to circuit part 103 by being scheduled to printed circuit pattern 101 or the like.Be soldered to the platform 109 that is used for the plus end that outside terminal connects in conjunction with the positive outside terminal 113 of positive electrode, and be soldered to the platform 111 that is used for the negative terminal that outside terminal connects in conjunction with the negative outside terminal 115 of negative electrode.Sheet metal 11 on plus end is soldered to the platform 105 of the plus end that is used for the sheet metal connection, and the sheet metal on negative terminal 13 is soldered to the platform 107 of the negative terminal that is used for the sheet metal connection.These sheet metals 11 and 13 welding be after the step of the terminal 5 of terminal 3 that these electrical sheet resistance is connected to positive electrode and negative electrode or before carry out.

The plus end 113 of outside terminal and the negative terminal 115 of outside terminal extend to the outside and come out from the encapsulation (coating material) of lithium rechargeable battery, and this expose portion is used as and is used to set up lithium rechargeable battery and the outside important electrode that is electrically connected.

Therefore, can be by sheet metal 11 and 13 being welded to the printed substrate 100 of holding circuit, and provide holding circuit in the encapsulation inside of this lithium rechargeable battery.

At this; also have the terminal 3 that is welded to positive electrode as described in the first embodiment in the lithium rechargeable battery of structure of sheet metal 7a and following sheet metal 9a; for example be welded to the printed substrate 100 of holding circuit as shown in Figure 12, and provide holding circuit in the encapsulation inside of this lithium rechargeable battery by sheet metal 9a and 9b under the handle.

[the 5th embodiment]

Figure 13 illustrates the schematic construction according to the lithium rechargeable battery of fifth embodiment of the invention.

Lithium rechargeable battery comprises the sheet metal 11 and 13 with the horseshoe-shape of being bent into; it is welded to the terminal 3 of positive electrode and the terminal 5 of negative electrode as described in the second embodiment respectively; and by in advance sheet metal 11 and 13 being welded to the printed substrate 100 of holding circuit; the terminal 5 of the terminal 3 of positive electrode and negative electrode is clipped in this sheet metal inside respectively; from upside and following side contacts this utmost point bolt 202a and 202b, and weld the terminal 3 of positive electrode and sheet metal 11 welding and the terminal 5 of negative electrode and sheet metal 13 by method for resistance welding and to make.

As shown in Figure 15, by respectively at the platform 105 that is used for the plus end that sheet metal connects of printed substrate 100 and platform 107 upper drill holes that are used for the negative terminal that sheet metal is connected form empty 141 and 143.

Sheet metal 11 on plus end can be welded in place the platform 105 of the plus end that connects in the lip-deep sheet metal of printed substrate 100 by reflow method.For example, can be in advance so-called welding paste be applied to the surface that is used for the plus end that sheet metal connects of Copper Foil of being attached with the scolding tin coating or the like, sheet metal 11 is placed on the plus end, be heated to 230 ℃ by reflow ovens, the sheet metal on the plus end 11 be welded to the surface of the platform 105 of the plus end that is used for the sheet metal connection.In addition, the sheet metal on negative terminal 13 can also be welded to the surface of the platform 107 of the negative terminal that is used for the sheet metal connection by identical technology.

In this manner, when carrying out when preliminary election is installed to resistance welded between the terminal 3 of the lip-deep sheet metal 11 of printed substrate 100 and positive electrode, following utmost point bolt 202b contacts by in advance printed substrate 100 being carried out through hole 141 that boring forms and sheet metal 11 following, and last utmost point bolt 202a and sheet metal 11 last slice contact, as shown in Figure 14.And predetermined voltage is applied between two utmost point bolt 202a and the 202b, generation from last utmost point bolt 202a in order by sheet metal 11 last slice, the electric current of utmost point bolt 202b under the following arrival of the terminal 3 of positive electrode and sheet metal 11, therefore can finish the firm welding between the terminal 3 of sheet metal 11 and positive electrode.In addition, when the number of times of resistance welded was set to 1 time, the number of the terminal 3 of positive electrode and the welding portion of sheet metal 11 can be reduced to one from two.Therefore, the area that welds required sheet metal 11 can diminish, and the sheet metal 11 of horseshoe-shape can further reduce, thereby can also further make the appearance and size miniaturization of whole lithium rechargeable battery.In addition, can carry out the resistance welded of sheet metal 13 and the terminal 5 of negative electrode on the negative terminal by identical technology as indicated above.

At this, structure as indicated above and resistance welded technology can be applied to lithium rechargeable battery, and it has goes up the structure that sheet metal 7a and 7b and following sheet metal 9a are welded to the terminal 3 of positive electrode described in first embodiment.For example; as shown in Figure 16; following sheet metal 9a is soldered to the platform 105 of the plus end that the sheet metal of the printed substrate 100 that is used for holding circuit connects in advance; and utmost point bolt 202a contacts with last sheet metal 7a to descend utmost point bolt 202b to contact upward with following sheet metal 9a by the through hole 141 that 100 borings form to printed substrate in advance, and scheduled current is applied to utmost point bolt 202a and 202b up and down.Thereby, can guarantee to go up the welding of the terminal 3 of the welding of sheet metal 7a and the terminal 3 of positive electrode and time sheet metal 9a and positive electrode, and can make the lithium rechargeable battery of the signal parts that have as shown in Figure 17.

In addition, when the surface of platform 105 of plus end that for example the relative thicker nickel dam (not shown) with 15-500 micron thickness is formed on the sheet metal connection of the printed substrate 100 that is used to have above-mentioned through hole by methods such as plating, sheet metal 9a omits this time sheet metal 9a under can also replacing by the use nickel dam, and the result can realize the further simplification of this structure.In this case, after forming nickel dam or before, can be by electroless plating (electrolessplating), weld method such as plating and be embedded in the so good conductive metallic material of for example copper, scolding tin or the like in the through hole 141 to form the state of so-called blind hole.Be embedded in metal material in the through hole 141 and can be sealed in the perforate of printed substrate 100 lip-deep nickel dams, acieral with the fusing of the terminal 3 that prevents positive electrode spills, and lower surface that electric current can be by being embedded in printed substrate 100 and the through hole 141 between the nickel dam on this surface (upper surface).

In this manner, when using nickel dam to replace down sheet metal 9a or 9b, metal material is embedded in through hole 141 or 143, can guarantee to carry out effective resistance welded by the resistance welded device as shown in Fig. 2 and 5.

[the 6th embodiment]

Figure 18 illustrates the schematic construction according to the lithium rechargeable battery of sixth embodiment of the invention.

In lithium rechargeable battery, be soldered on the sheet metal 11 that will be sandwiched in horseshoe-shape therebetween by the terminal 3 of the made positive electrode of acieral, with identical described in second embodiment.

On the other hand, terminal 51 by the made negative electrode of nickel-base alloy is bent into the shape that its end approximately is folded into horse-hof shape, and the sheet metal on the negative terminal made by acieral 53 is soldered to the tip portion of the terminal 51 that will be sandwiched in the negative electrode with horseshoe-shape therebetween.In this structure, can also carry out the resistance welded of sheet metal 53 and the terminal 51 of negative electrode on negative terminal, or the like.Can be by adopting in the constructed resistance welded of carrying out in above-mentioned situation described in each the foregoing description.That is to say, handle being welded to from the above and below within the tip portion of the horseshoe-shape that will be clipped in terminal 51 with dystectic negative electrode by the sheet metal 53 that has on the made negative terminal of low-melting acieral by resistance welded.Therefore, even melt fully on thickness direction at the acieral of the sheet metal on the negative terminal 53, the terminal 51 with dystectic negative electrode can prevent that melt is splashed to outside, sputter or the like.At this, as the sheet metal on negative terminal 53, for example can adopt the thin slice made by aluminium, acieral, copper, acid bronze alloy, silver-base alloy or the like, by the nickel-base alloy made thin slice identical with the terminal 51 of negative electrode, particularly the terminal 51 than negative electrode is thicker.

In addition, welding rod 202 (202a, 202b) need have hardness, electric conductivity and thermal conductivity, and the copper that is for example strengthened by the such copper alloy of chromium-copper, aluminium oxide or the like institute constitutes.The end shape of welding rod 202 for example is preferably round table-like, billiard table shape or the polyhedral angle cone-shaped as shown in Figure 19 F by the cutting of the upper flat of hemisphere is formed as shown in Figure 19 E, for example the tetrahedral angle cone-shaped (Pyramid) that the tip cylindric, by smooth cutting circular cone as shown in Figure 19 D coniform, as shown in Figure 19 C hemispherical, as shown in Figure 19 B as shown in Figure 19 A obtains.

Particularly, semi-spherical shape is the end shape of the welding rod 202 of the best.Utilize this shape, big pressure can be applied to the middle part at the tip of welding rod 202, and when welding rod 202 was pressed on the object of wanting soldered, welding current was concentrated and is flow through, therefore temperature raises in very little scope, soldered object to be melted to form alloy-layer.In addition, owing to be fixed firmly to the central authorities of welding rod 202 in the position that forms alloy-layer, therefore be fixed by the distance between two welding portions of welding current, and welded condition is stable, this is desired.In addition, pressure when welding rod 202 being pressed on the object that will weld dies down towards peripheral direction from the middle part of welding rod 202, even therefore the object that will weld is in the fusing of the middle part of welding rod 202, its periphery not exclusively melts, and is difficult to form in the object that will weld a cavity.At this, welding current dies down towards periphery and pressure pro rata from welding rod 202 central authorities.

Effective hemispherical tip has a kind of such shape, and wherein body diameter is 0.5 millimeter-10 millimeters, and the radius of its most advanced and sophisticated hemisphere for example is 0.5 millimeter-5 millimeters.Best hemispherical tip has a kind of such shape, wherein being positioned at from welding rod 202 ends upwards, the body diameter of 10 millimeters position is 3 millimeters, upwards the body diameter of 1 millimeter position is 1.5 millimeters from the end of welding rod 202, and the radius of hemisphere that should the tip is 1.5 millimeters.

This cone shape provides almost identical with this semi-spherical shape effect.The drift angle of circular cone is preferably the obtuse angle of 140 degree-175 degree, and the diameter of cylinder is preferably 0.5 millimeter to 5 millimeters.Best coniform tip has a kind of shape, wherein being positioned at from the end of welding rod 202 upwards, the body diameter of 10 millimeters position is 3 millimeters, being positioned at from the body diameter of the position of 1 millimeter of the point upward of welding rod 202 is 1.5 millimeters, and should the tip coning angle be 170 degree.If angle that should the tip is set to 90 degree or littler acute angles, then may be applied to this middle part to elevated pressures, and the object that will weld may be pierced, perhaps the zone by welding current may diminish, and this is not desired.In addition, the polyhedral angle cone-shaped is identical with cone shape.

Although cylindric is the prevailing shape that for example is used to weld the nickel sheet, the current value change that is used to weld, so weld strength also tends to change, and bad welding situation may appear with specific ratio.For example, the specific smaller portions that are applied to than big pressure in the periphery at welding rod 202 tips, and welding current flows through this part, when welding rod 202 is pressed on the object that is used for resistance welded, for each welding, according to the state of the state of oxidation at the tip of welding rod 202 and ageing state, bearing or will weld the body surface state, make the position of welding portion move by accident.Therefore, can not guarantee that two distances between the welding portion are constant, resistance value and current value change between two welding rods 202, this be do not expect.In addition, if voltage that is used to weld or electric current increase, then soldered object may melt fully and may produce the cavity.But because the area of this tip portion is bigger than the area of semi-spherical shape, so alloy-layer may be formed in the bigger zone.In addition, this have be recycled and reused for the welding after carry out the lower advantage of polishing operation and running cost easily.

The effect that obtains billiard table shape that truncated conical shape or the tip by smooth cutting hemisphere obtain and semi-spherical shape by the tip of entirely cutting circular cone is similar, and has good relatively pointed shape.In addition, compare with semi-spherical shape, the zone that is applied in high pressure is bigger, and alloy-layer can be formed in the big zone.But if voltage that is used to weld or electric current increase considerably, then the object that will weld is completely melted, and may produce the cavity, and this is not desired.

[the 7th embodiment]

Figure 20 illustrates the method according to the manufacturing weldment of seventh embodiment of the invention, and the welding equipment that is used for this method.In this embodiment, will describe by the situation of the made aluminium flake 311 of the material different with 312 welding of nickel sheet with the material of the object 310 that will weld.At this, aluminium flake 311 can be the acieral sheet that comprises aluminium, and nickel sheet 312 can be the nickel-base alloy sheet that comprises nickel.

This welding equipment comprises the bearing 320 that is used to place the object 310 that will weld and is used to push down the object 310 that will weld and produces a pair of welding rod 330 by the electric current of the object 310 that will weld.This welding rod 330 is connected to unshowned electric welding control appliance, thus the condition that can be provided for welding soldered object 310.

Best, in bearing 320, being used to place the placement surface 310a that will weld object 310 at least, to be higher than the refractory metal that will weld object 310 by fusing point made.Its reason is that high melt point can prevent that bearing 320 from together melting along with welding object 310, and prevents to weld object 310 and be attached in welding on the bearing 320.Another reason is because the high thermal conductivity of metal can obtain radiating effect, and can prevent the excess molten and the boiling of aluminium flake 311.Other reason is because the electric conductivity of metal makes welding current can also flow through bearing 320, and can produce the higher welding current by the welding portion 310a that will weld object 310.

In the present embodiment, be 660 ℃ as the fusing point of the aluminium flake of wanting soldered object, the fusing point of nickel sheet is 1455 ℃, and is made thereby this placement surface 320a preferably is higher than the refractory metal of 1455 ℃ of fusing points of nickel sheet by fusing point.In addition, more effective when the difference between the fusing point of placement surface 320a and nickel sheet is big.

In addition, the placement surface 320a of bearing 320 is that 10W/mK or bigger metal are made by the thermal conductivity under 700 ℃ preferably at least.Because if thermal conductivity is too low, the radiating effect that can not obtain to expect then, and can not prevent the excess molten and the boiling of aluminium flake 311 effectively.In addition, when the electric welding control appliance hour, the placement surface 320a of bearing 320 is that 200W/mK or littler metal are made by the thermal conductivity under 700 ℃ preferably at least.Because the electric current of electric welding control appliance and voltage is less and the situation of maximum weld electric current in 300A-800A or littler scope under, if thermal conductivity is too high, then heat can not be accumulated in will welding object 310 and can not carry out welding.In this connected, thermal conductivity was defined in 700 ℃, because the part of direct and the contacted placement surface 320a of welding portion 310a is heated to about 700 ℃ in welding.

In addition, the placement surface 320a of bearing 320 is that 30 μ Ω cm or littler metal are made by the specific insulation under 100 ℃ preferably at least.Its reason is nickel sheet 310 and the aluminium flake 311 that most of welding current flows through the positive electrode of conduct lead-in wire or joint object under the too high situation of the specific insulation of placement surface 320a on in-plane, higher welding current can not be on the vertical direction of the welding portion 310a of the object 310 that will weld, produced, and welding portion 310a can not be heated fully.In addition, Another reason is that the welding current of about 20-70% flows through on the in-plane of two welding portion 310a that connect above-mentioned aluminium flake 311, the temperature of aluminium flake 311 uprises, the welding portion 310a excess molten of aluminium flake 311, and may produce the cavity, under the too high situation of the specific insulation of placement surface 320a.That is to say, preferably reduce the heat of aluminium flake 311.In this connected, specific insulation was defined in 100 ℃, and this is to be heated in welding and to be approximately 100 ℃ because approach the position of the welding portion 310a of the placement surface 320a by welding current.

At least the metal that constitutes this placement surface 320a preferably comprises at least a metal that is selected from platinum (Pt), iron (Fe), chromium (Cr), zinc (Zr), titanium (Ti), molybdenum (Mo), palladium (Pd), tungsten (W) and iridium (Ir).In this manual, the notion of metal is a broad sense, and comprises alloy.Its physical characteristic (fusing point, at thermal conductivity under 700 ℃ and the specific insulation under 100 ℃) is shown in the table 1.

When whole bearing 320 is made of above-mentioned metal, bearing 320 preferably have 1 millimeter or more thickness (this be with the perpendicular direction of placement surface 320a on thickness).Its reason is if bearing is too thin, and the resistance value that then can not obtain between the welding portion of sufficient radiating effect and bearing 320 is higher, therefore can not produce sufficiently high welding current, in addition because the pressure of welding rod 330 causes bearing 320 to be out of shape.

In addition, the metal that whole bearing 320 can be by mentioned earlier is made, and bearing 320 can have the placement part that metal constituted 321 by mentioned earlier and has such as the higher radiator portion 322 of the thermal conductivity of the placement part shown in Figure 21 321.Although its reason is to make by single kind whole bearing 320 that metal constituted to be more prone to, but when bearing 320 has placement part 321 and radiator portion 322, because placement part 321 is made by metal hard to tolerate, therefore can prevent to weld object 310 adheres to, the heat radiation of welding portion 310a can be strengthened by radiator portion 322, and can prevent the excess molten of aluminium flake 311.Another reason is that above-mentioned most of metal is expensive, and only when placement part 321 is made of this metal, just can obtain to reduce the advantage of the cost of bearing 320.In addition, its reason is if cause placement part 321 to become coarse or aging owing to repeatedly carrying out resistance welded, then can reuse radiator portion 322 by only changing placement part 321.Therefore, have as shown in Figure 21 placement part 321 and the contact portion fusing that can prevent soldered object 310 of the bearing 320 of radiator portion 322, and can farthest dispel the heat, so this is preferred.

Especially, the material of formation radiator portion 322 preferably comprises at least a metal that is selected from silver (Ag), copper (Cu), aluminium (Al) and gold (Au).Its thermal conductivity at 100 ℃ is as shown in table 2.Thermal conductivity when this is illustrated in 100 ℃ is because think that the temperature of radiator portion 322 is approximately 100 ℃ in welding.In addition, the thermal conductivity of platinum is 72W/mK in the time of 100 ℃.

The thickness of placement part 321 preferably is approximately 0.5 millimeter-2 millimeters, is preferably about 1 millimeter.Its reason is if thickness is too thin, and then this placement part 321 is owing to the pressure of welding rod 330 is out of shape, and this radiator portion 322 fusings and distortion, if and it is too thick, then radiating efficiency descends, and weld strength has small decline, and the cost of bearing 320 also increases.The thickness of radiator portion 322 for example is preferably 5 millimeters or more.If this thickness is too thin, owing to can not obtain sufficient cooling effect, so these bearing 320 temperature own also reach oxidized and aging high temperature.

By placement part 321 and radiator portion 322 are carried out minute surface fine finishining, make mating surface not coarse, then by exerting pressure and combination with the Luo silk, perhaps supporting is positioned at attachment above or below it or the like, so that it has mechanical adhesion.In addition, placement part 321 can place radiator portion 322 tops simply.In resistance welded and since several kilograms or more pressure be applied on the direction on placement part 321 and the radiator portion 322 adhering to so that their thermal.In addition, placement part 321 and radiator portion 322 can be welded or combination by apply several tons or bigger high pressure from both sides up and down.Should be noted that so mechanical bond is preferred because mechanical bond is changed placement part 321 more easily and stability and adhesive force also are good.

When mechanical bond placement part 321 and radiator portion 322, can be inserted between placement part 321 and the radiator portion 322, as shown in Figure 22 by the made adhesive layer 323 of silicon adhesive, silicone oil, conducting strip or the like.In this manner, can easily keep bonding between placement part 321 and the radiator portion 322, and can further improve heat dispersion, this also is preferred.

In addition, placement part 321 and radiator portion 322 can engage by brazing.In this manner, although it is relatively poor to change the convenience of placement part 321, the cohesive between placement part 321 and the radiator portion 322 is good, and heat dissipation characteristics also is good, can easily make in addition, thereby it is preferred.The material that is used for brazing for example can comprise the silver-colored wax of argentiferous, leaded scolding tin or the Pb-free solder of cupric.Should be noted that the minimizing slightly that utilizes leaded scolding tin to cause heat.

Welding rod 330 needs high rigidity, high conductivity and high-termal conductivity, and for example made by copper alloy, for example the copper of chromium-copper or aluminium oxide enhancing.The pointed shape of welding rod 330 for example be preferably as shown in coniform, Figure 23 C as shown in hemispherical, Figure 23 B as shown in Figure 23 A cylindric, as shown in Figure 23 D by the tip of entirely cutting circular cone obtain trapezoidal, as shown in Figure 23 E the upper flat of hemisphere be cut to billiard table shape or the polyhedral angle cone-shaped as shown in Figure 23 F that the plane obtains, for example tetrahedral angle cone-shaped (pyramid shape).

Especially, hemispherical is the preferred pointed shape of welding rod 330.Utilize this shape, when welding rod 330 is pressed on the soldered object 310, elevated pressures is applied to the middle part at welding rod 330 tips, so temperature increases in very little scope, soldered object 310 is melted easily to form an alloy-layer.In addition, owing to form the central authorities that the position of alloy-layer is fixedly secured to welding rod 330, the distance that therefore flows through between two welding portion 310a of welding current is fixed, and welded condition is stable, and this is desirable.In addition, pressure when being pressed in welding rod 330 on the soldered object 310 dies down towards the periphery from the central authorities of welding rod 330, even therefore soldered object 310 is in the fusing of the middle part of welding rod 330, its periphery is not completely melted, and is not easy to form the cavity in object 310 that will be soldered.At this, welding current weakens with pressure towards peripheral pro rata from the central authorities of welding rod 330.

Effective hemispherical tip has a kind of shape, and wherein body diameter is 0.5 millimeter-10 millimeters, and the radius of its most advanced and sophisticated hemisphere for example is 0.5 millimeter-5 millimeters.Best hemispherical tip has a kind of shape, wherein being positioned at from welding rod 330 ends upwards, the body diameter of 10 millimeters position is 3 millimeters, upwards the body diameter of 1 millimeter position is 1.5 millimeters from the end of welding rod 330, and the radius of hemisphere that should the tip is 1.5 millimeters.

This cone shape provides almost identical with this semi-spherical shape effect, and is a kind of preferable relatively pointed shape.The drift angle of circular cone is preferably the obtuse angle of 140 degree-175 degree, and the diameter of cylinder is preferably 0.5 millimeter to 5 millimeters.Best coniform tip has a kind of shape, wherein being positioned at from the end of welding rod 330 upwards, the body diameter of 10 millimeters position is 3 millimeters, being positioned at from the body diameter of the position of 1 millimeter of the point upward of welding rod 330 is 1.5 millimeters, and should the tip coning angle be 170 degree.If angle that should the tip is set to 90 degree or littler acute angles, then may be applied to this middle part to elevated pressures, and the object 310 that will weld may be pierced, perhaps the zone by welding current may diminish, and this is not desired.In addition, the polyhedral angle cone-shaped is identical with cone shape.

Although cylindric is the prevailing shape that for example is used to weld the nickel sheet, the current value change that is used to weld, so weld strength also tends to change, and bad welding situation may appear with specific ratio.For example, the specific smaller portions that are applied to than big pressure in the periphery at welding rod 330 tips, and welding current flows through this part, when welding rod 330 is pressed on the object 310 that is used for resistance welded, for each welding, according to the state of the state of oxidation at the tip of welding rod 330 and ageing state, bearing 320 or will weld object 310 surface state, make the position of welding portion move by accident.Therefore, can not guarantee that two distances between the welding portion 310a are constant, resistance value and current value change between two welding rods 330, this be do not expect.In addition, if voltage that is used to weld or electric current increase, then soldered object 310 may melt fully and may produce the cavity.But because the area of this tip portion is bigger than the area of semi-spherical shape, so alloy-layer may be formed in the bigger zone.In addition, this have be recycled and reused for the welding after carry out the lower advantage of polishing operation and running cost easily.

The effect that obtains billiard table shape that truncated conical shape or the tip by smooth cutting hemisphere obtain and semi-spherical shape by the tip of entirely cutting circular cone is similar, and has good relatively pointed shape.In addition, compare with semi-spherical shape, the zone that is applied in high pressure is bigger, and alloy-layer can be formed in the big zone.But if voltage that is used to weld or electric current increase considerably, the object 310 that then will weld is completely melted, and may produce the cavity, and this is not desired.

In this embodiment, use such welding equipment that aluminium flake and nickel sheet are carried out following welding.

At first, aluminium flake 311 and nickel sheet 312 are overlapped on the placement surface 320a of bearing 320.In this case, aluminium flake 311 promptly has more low-melting thin slice, is directly connected to the bearing side.Because the radiating effect with bearing 320 can prevent excess molten.Thereby a pair of welding rod 330 is moved downward, and pushes down this nickel sheet 312 from the top with predetermined strength.At this moment, directly in each part below the tip of welding rod 330, nickel sheet 312 and aluminium flake 311 are bonding by pressure institute mutually, and aluminium flake 311 is attached on the bearing 320.

Then, by at this unshowned electric welding control appliance, preset time the voltage with a kind of voltage waveform or current waveform is applied to this to welding rod 330 on.Welding current flows through in the short time of about 10 milliseconds of magnitudes in order: at the welding rod 330 of the welding rod 330 → nickel sheet 312 → aluminium flake 311 → bearing 320 → aluminium flake 311 → nickel sheet 312 on the positive electrode → on negative electrode.Thereby, nickel sheet 312 in the part under welding rod 330 and the junction between the aluminium flake 311, i.e. welding portion 310a melts and fuses together.When stopping welding current by the electric welding control appliance, welding portion 310a cools off fast, and forms alloy-layer and finish welding.

Then, the surface of the aluminium flake 311 adjacent with bearing 320 is cooled off by the radiating effect of bearing 320, and is had dystectic oxide-film and cover, and therefore is not heated to fusing point.In addition, the placement surface 320a of bearing 320 is made by the refractory metal that fusing point is higher than the fusing point that will weld object 310 at least, therefore is not melted.Therefore, be not easy to form alloy-layer between bearing 320 and the aluminium flake 311.In addition, in bearing 320, stop temperature to raise, and prevent because the oxidation that high temperature caused by self heat radiation.In addition, when bearing 320 had placement part 321 and radiator portion 322, the heat that produces in welding portion 310a was dispersed more effectively.

The voltage that is used to weld, voltage application time or the like can be set to be enough at least melt the numerical value of nickel sheet 312.For example, maximum voltage is set to 0.5V-5V, and maximum current is set to 100A-3000A, and the voltage application time is set to 5 milliseconds-40 milliseconds.As another example, voltage is set to 1.1V, and electric current is set to about 1000A, and the voltage application time is set to about 10 milliseconds.The waveform of the voltage that applies can be DC voltage waveform or alternating voltage waveform.But direct current can produce big electric current in the short period of time, therefore increases the temperature of welding portion 310a apace, and this is desirable.Therefore, alloy-layer can be formed in welding portion 310a in such short time can cooling off aluminium flake 311.In addition, voltage applies control system or electric current and applies control system and be enough to as this control system.It is preferred that voltage applies control system, because it is constant that the heat of welding portion 310a keeps, and it also is preferred that electric current applies control system, because even the surface state of the placement surface 320a of the object 310 that will weld, welding rod 330 and bearing 320 or resistance change, therefore also can keep constant electric current, the heat at the part place of nickel sheet 312 and aluminium flake 311 combinations keeps constant.

In addition, preferably to several thousand welding, use the polishing wheel, grinding stone and the sand paper that are applied with abrasive material to carry out the cleaning operation of the placement surface 320a of polishing bearing 320, to remove lip-deep oxide and aluminium attachment at placement surface 320a every hundreds of.Its reason is that the resistance of the placement surface 320a of bearing 320 increases, and the welding current that then flows through bearing 320 reduces, and weld strength becomes unstable.In addition, preferably the tip of welding rod 330 is polished every several thousand welding.For example, by most advanced and sophisticated or aging thin layer, perhaps oxidation or aging thick-layer are ground off about 0.2 millimeter or more and make and do not have oxidized metal partly to come out with the such cutting machine of end mill(ing) cutter with sand paper polishing oxidation.In addition, preferably after several ten thousand times or welding more frequently with the placement part 321 and the welding rod 330 of this bearing 320 of new part replacement or bearing 320.

Therefore, according to present embodiment, at least it is made that the placement surface 320a of bearing 320 is higher than the refractory metal of fusing point of the object 310 of wanting soldered by fusing point, the refractory metal that for example has the fusing point that is higher than 1455 ℃, therefore, even carry out resistance welded on the soldered object 310 in made the wanting of the different materials such by for example aluminium flake 311 and nickel sheet 312, can prevent that soldered object 310 is attached on the bearing 320, can prevent soldered object 310 excess molten, can produce higher welding current by welding portion 310a in addition.Therefore, soldered object 310 to weld securely by resistance welded.In addition, owing to the wider range that is provided with of electric welding control appliance, when a large amount of welding, can stablize weld strength.In addition, because aluminium flake 311 is soldered and cooling, so aluminium can not seethe with excitement and sputter fiercely, can improve the security of operation, can further save the time and the work of cleaning in addition.

Especially, made as the placement surface 320a of bearing 320 at least by the metal of the thermal conductivity that under 700 ℃, has 10W/mK, soldered object 310 can be moderately heated, and excess molten and boiling can be prevented effectively by heat radiation moderately.

In addition, when the placement surface 320a of bearing 320 at least made by the metal of the specific insulation that under 100 ℃, has 30 μ Ω cm, welding current also can moderately pass through this bearing 320, can be by producing high welding current in vertical direction by welding portion 310a, this welding portion 310a can be by local heat fully.

In addition, when bearing 320 has placement part 321 and radiator portion 322, can further increase radiating effect, can reduce cost, and can reuse by moderately heating soldered object 310.For example, if bearing 320 is only become to make by platinum, and bearing 320 is of a size of 10 * 10 * 10mm, and its cost is approximately 40,000 yen or more.If but it is constituted by the made placement part 321 of the platinum that is of a size of 10 * 10 * 1mm and by the silver-colored made radiator portion 322 of 10 * 10 * 9mm, then its cost is 8000 yen or still less.

In addition, when the pointed shape of welding rod 330 is round table-like, billiard table shape or a polyhedral angle cone-shaped by the cutting of the upper flat of hemisphere is formed hemispherical, cylindric, that obtain by the tip of entirely cutting circular cone, can reduce the scope of welding current, and welding portion 310a can be heated easily.In addition, owing to the distance between two welding portion 310a can keep constant in degree of precision ground, so welding condition can be stabilized.Especially, semi-spherical shape can provide better effect.

In addition, this embodiment provides the description of welding as the aluminium flake 311 and the nickel sheet 312 of soldered object 310, but the present invention can be widely used in welding by the made two or more objects of different materials.For example, aluminium flake 311 can be welded to sheet metal (composite sheet) similarly, and wherein nickel sheet and iron plate are glued together, and changes nickel sheet 312.In this case, when it is a nickel sheet part and the combination of wanting soldered aluminium flake 311 in sheet metal, then soldered object is the nickel sheet, and the fusing point of soldered object means it is the fusing point of aluminium flake and nickel sheet.

The method of making weldment for example can be used for making the method for following battery.

Figure 24 illustrates the method for using according to the manufacturing battery of the method for making weldment as present embodiment, and with the structure of the battery of this method manufacturing.Figure 25 illustrates along the cross section structure of line I-I intercepting shown in Figure 24.This battery has a kind of form, and the battery component 350 that wherein is attached with the extreme bar 342 of positive electricity end bar 341 and negative electricity is comprised in case member 360 inside.Battery component 350 has between positive electrode 351 and the negative electrode 352 across the overlapped parts of electrolyte 353.

Positive electrode 351 for example comprises positive electrode current collection layer 351a and positive electrode mixed layer 351b, and positive electricity end bar 341 is connected to positive electrode current collection layer 351a.Positive electrode current collection layer 351a for example comprises aluminium foil, and positive electrode mixed layer 351b for example comprises such conductive agent of positive electrode material, for example carbon black or graphite and the such adhesive of polyvinylidene fluoride.Positive electrode material preferably includes the metal sulfide of the lithium combination oxide that contains lithium (Li) or lithium combination sulfide, no lithium or oxide, specific polymeric material or the like, and any or two kinds or more kinds of material are selected for this battery.

Positive electrode 352 for example comprises negative electrode current collector collecting layer 352a and negative electrode mixed layer 352b, and the extreme bar 342 of negative electricity is connected to negative electrode current collector collecting layer 352a.Negative electrode current collector collecting layer 352a for example comprises Copper Foil, and negative electrode mixed layer 352b for example comprises negative electrode material and the such adhesive of polyvinylidene fluoride.Negative electrode material comprises the material that can absorb and discharge lithium, for example material with carbon element, silicon composition or tin composition, and perhaps for example lithium metal or lithium alloy can precipitate material with separating Li like this.

Electrolyte 353 comprises so-called gel-type electrolyte or so-called organic solid-state electrolyte, and for example comprise polymeric composition and, if necessary, plasticizer and as the lithium salts of electrolytic salt.Can between positive electrode 351 and negative electrode 352, place unshowned spacer if necessary.

Positive electricity end bar 341 for example comprises the flake aluminum that thickness is about 0.05 millimeter-0.15 millimeter magnitude.The extreme bar 342 of negative electricity for example comprises the thin nickel sheet that thickness is about 0.05 millimeter-0.15 millimeter magnitude.Wiring board 371 and 372 for example comprises the thin nickel sheet that thickness is about 0.1 millimeter-0.2 millimeter magnitude, and perhaps the sheet metal that is bonded together of nickel sheet and iron plate is welded to positive electricity end bar 341 and the extreme bar 342 of negative electricity respectively.

This battery can be made with the following method.

At first, make battery component 350 with predetermined method, the extreme bar 342 of positive electricity end bar 341 and negative electricity is connected to battery component 350, and battery component 350 is comprised in the case member 360.Thereby wiring board 371 is fetched welding positive electricity end bar 341 by the method according to above-mentioned manufacturing weldment by electric resistance welding.That is to say that positive electricity end bar 341 points to bearing 320 sides, positive electricity end bar 341 and wiring board 371 are placed on the bearing 320, this bearing is made by the refractory metal that fusing point is higher than positive electricity end bar 341 and wiring board 371, and pushed down by welding rod 330, to apply voltage, as shown in Figure 20.At this, owing to use said method, positive electricity end bar 341 and wiring board 371 are welded securely, and not appending on the bearing 320 by the made positive electricity end bar 341 of aluminium flake.

Then, wiring board 372 is welded on the extreme bar 342 of negative electricity by method for resistance welding.Although can carry out said method, resistance welded can be carried out by using conventional bearing 380, and this routine bearing is promptly by the made bearing of copper, copper alloy or non-metal plate, because extreme bar 342 of negative electricity and wiring board 372 are all made by the nickel sheet.Therefore, finish the battery shown in Figure 24.

In addition, when the battery made as shown in Figure 26, can use method according to the manufacturing weldment of present embodiment.Except the tip portion at positive electricity end bar 341 and the extreme bar 342 of negative electricity has groove 341a and the 342a, this battery has the structure identical with the battery shown in Figure 24.

In this battery, because groove 341a is positioned at the tip portion of positive electricity end bar 341, therefore less welding current is by positive electricity end bar 341, and most of welding current is by bearing 320 or wiring board 371.Therefore, weld strength uprises.

In this connects, if similar groove and the extreme bar 342 the same wiring boards 371 that also are arranged in of the negative electricity of positive electricity end bar 341, then owing to there is not electric current to flow through welding rod 330 at the welding rod 330 → wiring board 371 on the positive electrode → on negative electrode, therefore stop the increase in temperature of the welding portion of wiring board 371, and seldom can obtain good effect.Therefore, preferably groove is not placed on wiring board 371 and 372.

Therefore, according to present embodiment, by the made positive electricity end bar of flake aluminum and can be by method for resistance welding and welding securely by the made wiring board of nickel sheet or the like.In this way, in the ultra-sonic welded of routine, the scope of the condition that is provided with that is used for high weld strength is very narrow, thereby be very difficult to the weld strength that keeps high, even and change a little when the shape of annex and position relation, then be difficult to the weld strength that keeps higher, and percent defective uprises.On the other hand, according to present embodiment, for wider range of the condition that is provided with of high weld strength, thereby keep higher weld strength easily, and can be reduced to low-down level to percent defective.In addition, because resistance welding equipment is more cheap than ultrasonic welding system, therefore can reduce equipment cost.

In addition, describe object lesson of the present invention in detail with reference to Figure 20 below.

[example 1 and 2]

As an example 1, bearing 320 is made by platinum, is welded by the method for resistance welding described in the foregoing description as the aluminium flake 311 and the nickel sheet 312 of soldered object 310.Then, apply control system by voltage and apply DC voltage, maximum voltage is set to 1.2V, and maximum current is set to 1000A, and the voltage application time is set up 10 milliseconds.As an example 2, weld aluminium flake 311 and nickel sheet 312 by the method for resistance welding that is similar to example 1, just bearing 320 is made by iron.

Then, with the mark of observation by light microscope on aluminium flake 311 sides, and the state of the placement surface 320a of bearing 320.In addition, the aluminium flake 311 and the nickel sheet 312 of welding are stripped from, and with the state of the nickel sheet 312 of observation by light microscope after peeling off.These results are shown in Figure 27 to 32.Figure 27, Figure 28, Figure 29, Figure 30, Figure 31 and Figure 32 illustrate respectively the aluminium flake 311 of example 1 welding mark, example 1 bearing 320 state, after peeling off the bearing 320 of welding mark, the example 2 of the aluminium flake 311 of state, the example 2 of example 1 state, after peeling off the state of example 2.

In addition, as the Comparative Examples 1 and 2 that is used for comparison, be similar to above-mentioned example and weld aluminium flake and nickel sheet by method for resistance welding, just bearing is made by copper (Comparative Examples 1) or pottery (Comparative Examples 2).In Comparative Examples 1 and 2, identical with above-mentioned example with observation by light microscope at the state of the welding mark on the aluminium flake side, bearing and the state of the nickel sheet after peeling off.These results are shown in Figure 33 to 38.Figure 33, Figure 34, Figure 35, Figure 36, Figure 37 and Figure 38 illustrate respectively the aluminium flake 311 of Comparative Examples 1 welding mark, Comparative Examples 1 bearing 320 state, after peeling off the state of the bearing 320 of welding mark, the Comparative Examples 2 of the aluminium flake 311 of state, the Comparative Examples 2 of Comparative Examples 1, the state of Comparative Examples 2 after peeling off.

As shown in Figure 27 to 32, according to this example, weld together hardly between bearing 320 and the aluminium flake 311, aluminium is also seldom attached on the bearing 320, and welding portion 310a's is in good condition.In addition, as shown in Figure 29 to 32, the state after peeling off shows that the aluminium of welding portion 310a is attached on the nickel sheet 312, has stronger welding between them.In addition, show that the area that has by the welding portion 310a of the example 2 of the made bearing 320 of iron is bigger by the area of the welding portion 310a of the made example 1 of platinum than bearing, and on bearing 320, have a spot of aluminium to adhere to.Its reason is, because compare the thermal conductivity of iron with platinum lower, so the temperature of welding portion 310a becomes higher, and welding portion 310a becomes bigger.Another reason is because the fusing point of iron is lower than the fusing point of platinum, therefore has fraction to be melted on iron surface.

On the other hand, as shown in Figure 33 to 35, in the Comparative Examples 1 with bearing made by copper, the area of welding portion 310a is less, and weld strength is lower, and has a large amount of aluminium to adhere on bearing.Its reason is the high thermal conductivity owing to copper, thereby can not heat aluminium flake 311 and nickel sheet 312 fully, and because lower fusing point makes a part of bearing along with aluminium flake 311 together melts.At this, think that the higher voltage that is provided with in welding makes soldered object 310 heat fully, and firmly welding; But aluminium flake 311 is attached on the bearing 320, and produces perforate on aluminium flake 311, so this is not preferred.

In addition, as shown in Figure 36 to 38, in the Comparative Examples 2 with bearing made by pottery, produce perforate in aluminium flake 311, weld strength is insecure, and a part of aluminium is attached on the bearing.Its reason is owing to there is not welding current to flow through bearing, most of welding current flows through aluminium flake 311 and nickel sheet 312, and the temperature of the welding portion of aluminium flake and nickel sheet does not increase, in addition in the situation of for example ceramic such insulator, since bearing than low heat conductivity, further cause aluminium flake excess molten and boiling.

That is to say, when bearing 320 is higher than the refractory metal of soldered object 310 when made by fusing point, discovery can make by the made two or more soldered object 310 of different materials by resistance welded and weld together securely, and 700 ℃ thermal conductivitys is 10W/mk or bigger, and the specific insulation in the time of 100 ℃ is lower than 30 μ Ω cm.

In addition, in above-mentioned example, be described in bearing 320 by platinum or iron is made and the situation of welding aluminium flake 311 and nickel sheet 312, but also can obtain the effect identical with above-mentioned example by the made bearing 320 of other material described in above-mentioned example by concrete example.In addition, as described in above-mentioned embodiment, when also obtaining the result identical when carrying out resistance welded with above-mentioned example by the made soldered two or more objects of other different materials 310.

Although the present invention is described by the foregoing description and example, the invention is not restricted to this embodiment and example, but various modification can be arranged.For example, describe the structure of battery in the above-described embodiments, but the present invention can be applied to other structure similarly by concrete example.For example, specifically described in the above-described embodiments and used lithium, but this can be applied to use other to be used for the battery of the reactant of electrode similarly as the battery that is used for the reactant of electrode.In addition, it is made by gel-type electrolyte or organic solid-state electrolyte to have described this electrolyte in the above-described embodiments, but it can be made by the electrolytic solution as liquid electrolyte, or by the made inorganic electrolyte of inorganic material.In addition, can use the battery of any kind.

In addition, the method for having described manufacturing weldment of the present invention in the 7th embodiment is used to make the situation of battery, but it can be similar to and is applied to make other products.Specifically, when welding has the thin objects of different melting points, can adopt the present invention.

As indicated above, according to this battery or manufacture method of the present invention, be sandwiched in fusing point and be higher than between the sheet metal of this electrode by being similar to the made electrode of metal material that aluminum or aluminum alloy has relatively low fusing point like this, and by method for resistance welding or other welding procedure, welding temperature is elevated to that the sheet metal surface that makes in the face of electrode can be melted so that form the high temperature of alloy with the surface of electrode, weld and carry out, generation can be eliminated the effect that occurs bad Welding Problems in the step of welding electrode and sheet metal like this, and realizes guaranteeing the secondary cell of mechanical mutually welding of electrode and sheet metal and electric welding.As a result, yield rate can be improved, and production cost can be further reduced, or the like.In addition, do not have bad welding phenomena, can increase the durability and the reliability of secondary cell by the welding that guarantees electrode and sheet metal.In addition, sheet metal is soldered to the upper and lower sides of a plate electrode, thereby mechanical strength is higher, and the area that is electrically connected only is welded to the situation of the upside and the downside of electrode greater than sheet metal, can increase the durability and the reliability of secondary cell at last.

Especially, Battery And Its Manufacturing Methods according to one aspect of the invention, this metal is by forming single bending tablet for about horseshoe-shape, and this electrode is sandwiched between the two ends of horseshoe-shape, therefore, need in resistance welded, not locate each sheet metal and be fixed to the upper and lower sides of electrode respectively.At last, this has the effect that guarantees that electrode and sheet metal weld, and further realizes secondary battery construction or comprise the simplification of the manufacture method of welding step.

In addition, method according to manufacturing weldment of the present invention, the placement surface of bearing is made by the refractory metal that fusing point is higher than soldered object, perhaps according to bearing of the present invention, it is made that this placement surface is higher than 1455 ℃ metal by fusing point, and the placement surface of bearing is made by the refractory metal that fusing point is higher than electrode tip bar and wiring board.Therefore, when being welded by method for resistance welding by the made soldered object of different materials, can prevent that soldered object is attached on the bearing, can prevent the excess molten of soldered object, and can produce higher welding current by welding portion.Therefore, can weld soldered object securely by resistance welded.In addition, the electric welding control appliance wider range is set, thereby when a large amount of welding, can stablize weld strength.

Especially, according to the manufacturing weldment of one aspect of the invention or the method for bearing, the placement surface of bearing is that 10W/mK or bigger metal are made by the thermal conductivity under 700 ℃, thereby soldered object can suitably heat, and can prevent excess molten effectively.In addition, the placement surface of bearing is that 30 μ Ω cm or littler metal are made by the specific insulation 100 ℃ the time, thereby can make suitable welding current by bearing, and can produce in vertical direction the high welding current by welding portion.

In addition, the method or the bearing of manufacturing weldment according to a further aspect of the present invention, this bearing has the radiator portion that placing component and thermal conductivity are higher than placement part, thereby can increase radiating effect and suitably heat soldered object, can reduce manufacturing cost, can also utilize again, and this technology is very with practical value.

Obviously, the present invention can be by many modification and variation under the inspiration of foregoing description.Therefore, should know except this is specifically described, realizing the present invention within the scope of the appended claims.

(table 1)

The chemical symbol of metal	Fusing point (degree)	Thermal conductivity under 700 ℃ (W/mK)	Specific insulation under 100 ℃ (μ Ω cm)
				Pt	1772	78	13.6
Fe	1537	34	14.7
				Cr	1857	About 66	16.1
Zr	1852	About 23	58
				Ti	1675	About 20	-
Mo	2610	113	7.6
				Pd	1554	93	13.8
Ir	2454	About 126	6.8
				W	3407	119	7.3

(table 2)

	Thermal conductivity under 100 ℃ (W/mK)
		Ag	422
Cu	395
		Al	240
Au	313

Claims (20)

1. method of making weldment, place on the bearing by the made soldered two or more objects of wanting of different materials comprising handle, and push down welding rod and carry out resistance welded, wherein bearing placement surface is made by the fusing point refractory metal higher than the fusing point of two or more objects that will weld at least.

2. the method for manufacturing weldment according to claim 1, wherein the placement surface of bearing is 10W/mK or bigger or be that the metal of 30 μ Ω cm or littler condition is made at 100 ℃ specific insulation by satisfying 700 ℃ thermal conductivity at least at least.

3. the method for manufacturing weldment according to claim 1, wherein nickel sheet, nickel-base alloy sheet or wherein the sheet metal that is bonded together of nickel sheet and iron plate and aluminium flake or acieral are soldered as the soldered object in the resistance welded.

4. the method for manufacturing weldment according to claim 3 wherein is placed on and comprises on the bearing aluminium flake or acieral sheet are placed the bearing side, and with soldered object overlaid.

5. the method for manufacturing weldment according to claim 1, wherein the placement surface of bearing is made by at least a metal at least, and this metal is selected from the group that comprises platinum, iron, chromium, zinc, titanium, molybdenum, palladium, tungsten and iridium.

6. the method for manufacturing weldment according to claim 1, wherein this bearing has the made placement part of refractory metal that is higher than the fusing point of soldered object by fusing point, and thermal conductivity is higher than the radiator portion of employed placement part.

7. the method for manufacturing weldment according to claim 6, wherein this placement part comprises at least a metal that is selected from platinum, iron, chromium, zinc, titanium, molybdenum, palladium, tungsten and iridium, and radiator portion comprises at least a metal that is selected from silver, copper, aluminium and gold.

8. the method for manufacturing weldment according to claim 6, wherein this placement part and radiator portion are by mechanical bond.

9. the method for manufacturing weldment according to claim 6, wherein adhesive layer places between this placement part and the radiator portion.

10. the method for manufacturing weldment according to claim 1, wherein the pointed shape of this welding rod be hemispherical, coniform, cylindric, by the tip of entirely cutting circular cone obtain round table-like, by combination hemisphere be flattened the top of cutting and shape or polyhedral angle cone-shaped that the plane forms.

11. the method for manufacturing weldment according to claim 1, wherein DC voltage or alternating voltage are applied control system or electric current and apply control system and be applied on the welding rod by voltage, maximum voltage is not less than 0.5V and is not more than 5V, maximum current is not less than 100A and is not more than 3000A, and the voltage application time is not less than 5 milliseconds and is not more than 40 milliseconds.

12. the method for manufacturing weldment according to claim 1, wherein soldered object is that pellet electrode and fusing point are higher than this electrode or thicker and have a sheet metal of identical fusing point than this electrode, this pellet electrode is connected to the secondary battery cell that can charge and discharge, and conducts electricity in charging and discharge process.

13. a bearing that is used for placing in welding process the object that will weld, wherein at least one placement surface is made by the metal that has than 1455 ℃ of higher fusing points.

14. bearing according to claim 13, wherein soldered object is that pellet electrode and fusing point are higher than this electrode or thicker and have a sheet metal of identical fusing point than this electrode, this pellet electrode is connected to the secondary battery cell that can charge and discharge, and conducts electricity in charging and discharge process.

15. bearing according to claim 13, wherein this placement surface is 10W/mK or bigger or be that the metal of 30 μ Ω cm or littler condition is made at 100 ℃ specific insulation by satisfying 700 ℃ thermal conductivity at least.

16. bearing according to claim 13, wherein the placement surface of bearing is made by a kind of metal, and this metal comprises and is selected from least a of platinum, iron, chromium, zinc, titanium, molybdenum, palladium, tungsten and iridium.

17. bearing according to claim 13, wherein this bearing comprises and is higher than 1455 ℃ the made placement surface of metal by fusing point, and comprises the higher radiator portion of this placement part of thermal conductivity ratio.

18. bearing according to claim 17, wherein this placement part comprises at least a metal that is selected from platinum, iron, chromium, zinc, titanium, molybdenum, palladium, tungsten and iridium, and

Radiator portion comprises at least a metal that is selected from silver, copper, aluminium and gold.

19. bearing according to claim 17, wherein this placement part and radiator portion are by mechanical bond.

20. bearing according to claim 17, wherein this placement part and radiator portion are bonded together by the adhesive layer between them.

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