TWI574446B - Connecting contact leads to lithium-based electrodes - Google Patents

Description

Technology for connecting contact wires to lithium-based electrodes

The present invention relates to a technique for connecting a contact wire to a lithium-based electrode.

Background of the invention

The prior art of the present invention relates to techniques for connecting a contact wire to an electrode.

Summary of invention

Viewed from one level, the present invention provides a method of connecting at least two electrodes to a contact wire, wherein each electrode comprises a sheet or foil having a contact area, and wherein the contact wire comprises a conductive line, It has a tip portion, the method comprising the steps of: i) placing a contact portion of the end portion of the contact wire with at least one electrode to overlap the tip portion and the contact region; ii) ultrasonically welding the contact region To the end portion, the at least one electrode is bonded to the contact wire; wherein at least the contact region of the sheet or foil is formed from an alloy of an alkali metal or an alkali metal; Thereby, the ultrasonic welding step welds the contact areas of the at least two electrodes together.

Preferably, the sheet or foil is entirely formed from an alloy of an alkali metal or an alkali metal, which may be lithium, lithium metal and lithium alloy, as it is more commonly used as a rechargeable battery. The anode material, which is soft and malleable, allows for a good connection of the end portions of the contact wires as the soldering step proceeds.

Preferably, the contact area is disposed on a tab projecting from the edge of the sheet or foil. In a preferred embodiment, the tab only provides point contact between the sheet or foil and the end portion that is in contact with the conductive portion. The sheet or foil of the electrode may comprise a region for contact with an electrolyte that is not in direct contact with the end portion of the wire, and ultrasonic welding is preferably applied to a region that is not in contact with any electrolyte of the electrochemical cell.

Preferably, there is no current collector in direct contact with the area in contact with the electrolyte, in fact, the electrode is completely lacking a current collector.

Preferably, the end portion is formed from a metal which is not alloyed with an alkali metal or a basic metal alloy for forming the tab, for example, a metal comprising at least one of copper and/or nickel or alloy.

Without wishing to be bound by any theory, the ultrasonic welding step is believed to melt or soften the metal and/or end portions of the tabs, so that the tabs and the end portions are welded together under applied pressure, ultrasonic sound The vibration can also remove or disperse the alkali metal oxide layer formed at least partially on the tab to promote the bonding structure. One advantage of the present invention is that the melting or softening can be limited. In a bonded or welded region, a stable bond is formed in a relatively small area, and the welded region can be less than 50%, preferably less than 30%, more preferably less than 20%, and even more preferably less than 10%. A sheet or foil area (eg 1-5%).

Preferably, the ultrasonic welding step is carried out at a frequency of 15-70 kHz, more preferably at 20-60 kHz, and even more preferably at 20-40 kHz, for example at 40 kHz, the ultrasonic welding step can be performed at The maximum pressure of 0.4 MPa is carried out, preferably at 0.1-0.4 MPa, for example at 0.2 MPa, and in one embodiment, the ultrasonic welding step is carried out at 30-50 kHz.

The ultrasonic welding step can be carried out at a power of 100 to 5000 watts, and an amplitude of 2 to 30 μm can be used.

In one embodiment, the ultrasonic welding step is performed using a device including a first jaw portion and a second jaw portion, the first jaw portion and the second jaw portion being movable relative to each other from a first separated position to A second separation position is such that the first and second jaw portions are adjacent to each other. Preferably, only the second jaw portion is movable, and the position of the first jaw portion is fixed.

The first jaw portion serves as a support member for the workpiece to be welded, and the second jaw portion is disposed to vibrate at an ultrasonic frequency. To perform the welding step, the end portion of the contact wire contacts the contact region of the at least one electrode to make the end portion Overlapped between the contact regions, the overlapping structure is then placed between the first and second jaw portions, preferably at the top of the first jaw portion, or a positioning clip can be used to support the overlapping structure Positioning, the second jaw portion is then moved relative to the first jaw portion to apply a clamp pressure between the workpieces to be welded, and the second jaw portion is then vibrated at the ultrasonic frequency, the action of the predetermined type and the friction electrode and the contact wire The ends are opposite each other to form a surface for bonding the process, The amplitude of the ultrasonic vibration plays an important role in the predetermined type and the part related to the welding process. When the second jaw is vibrated, the first jaw is maintained at a fixed position, and the contact area of the electrode and the end of the contact area are continued. Soldered together during the main welding process.

The end portions of the contact wires may be substantially flat or planar, or may be of other shapes or configurations, depending, for example, on the shape or configuration of the welding apparatus used.

In one embodiment, a method is provided wherein the electrode comprises a sheet or foil having a contact region, and wherein the contact wire comprises a conductive wire having a tip portion, the method comprising the steps of: disposing the contact wire a contact portion of the end portion with the at least one electrode to overlap the end portion and the contact portion; ultrasonically soldering the contact portion to the end portion to bond the at least one electrode to the contact wire; wherein the sheet or At least the contact zone of the foil is formed from an alloy of an alkali metal or an alkali metal.

In some embodiments, a plurality of electrodes may be provided, each electrode comprising a sheet or foil having a tab (defining a contact region) projecting from substantially the same position of each sheet such that the electrodes When aligned with one another and arranged in an electrode stack, the tabs of the electrode stack are substantially aligned. Undoubtedly, the tabs defining the contact regions are formed from an alloy of an alkali metal or an alkali metal, preferably lithium or a lithium alloy.

In these embodiments, the end portion of the contact wire may be placed at the top of the tab of the electrode stack, at the bottom of the tab of the electrode stack, or at an intermediate position between the top and bottom (ie, at least one tab) Above At least one of the tabs is below), the tabs of the electrode stack can be pressed together at the tip end placed on top of or below the extruded tab and before ultrasonic welding is completed.

In an embodiment in which an electrode stack is provided, the soldering step physically connects the tabs together. Preferably, the ultrasonic soldering step causes at least two tabs or foils of the foil or foil formed from a lithium metal or lithium metal alloy (contact zone) Soldering together, in a preferred embodiment, ultrasonic welding establishes, for example, lithium to lithium bonding in addition to soldering between the ends of the contact wires.

The end portion of the contact wire may be flat and lacking perforation, or the end portion may be in the form of a hole, a stamping or a mesh-like or a mesh. When such a perforation is presented, it is important that the metal of the tab is sufficiently malleable. Passing through the perforations so that the tip portion can become embedded to form a single phase of the preferred first metal, which forms a close contact between the metal of the end portion of the contact wire and the contact area of the electrode, and is interposed between the contact wires Between the electrodes.

The end portion has a perforation, and the opening ratio of the end portion may be defined by a ratio of an open area of the end portion to an entire surface area, and an opening ratio of the end portion of the contact wire may be in a range of 5% to 95%, preferably 20 % to 90%, for example 50% to 80%.

The conductive wires of the contact wires may themselves be substantially planar, such as in the form of a tape, although other shapes may be more practical, the conductive wires may be made of the same metal as the end portions, or different metals.

In this manner, by making the contact wires made of a different metal than the electrodes, a more secure connection can be formed, it being understood that the contact wires will be substantially exposed to the outside of the housing of the battery and must be well conductive. Sex Made of metal, but not highly reactive when exposed to gases or moisture, suitable metals include nickel, copper, stainless steel or different alloys.

Furthermore, the metal that contacts the wire, because it is only attached to the protruding tab of the electrode, is more suitable for direct exposure to the electrolyte when the battery is combined.

Still another advantage is that, in the absence of the electrode as a whole, it is required to form or be disposed on a current collector made of a metal other than the metal used for the sheet or foil of the electrode, the at least one electrode can achieve good contact, in other words The main part of the electrode is exposed to an electrolyte consisting only of the first metal (such as lithium or lithium alloy), does not require copper or nickel or other current collectors, it will add unwanted weight and is used as a tree in the recycling process A substrate of the structure of a dendrites.

Furthermore, it is important that the contact wires are selected to form an alloy with the metal of the electrode in order to avoid a reduction in the amount of the first metal that is achievable for the electrochemical system of the battery, for example, lithium will form an alloy with aluminum. But does not form an alloy with nickel or copper.

According to still another object of the present invention, there is provided a device obtained according to the aforementioned method, the device comprising at least two electrodes, each electrode comprising a sheet or foil having a contact region formed from an alkali metal or an alkali metal An alloy, and a contact wire, comprising a conductive wire having a tip portion, wherein a tip end portion of the contact wire overlaps and is ultrasonically soldered to a contact region of the at least one electrode, and wherein at least a portion of the contact regions are in contact with each other Ultrasonic welding, therefore, for example, when the contact region is formed from lithium or a lithium alloy, ultrasonic welding between the lithium/lithium alloy and the lithium/lithium alloy is formed.

In one embodiment of the apparatus, at least two electrodes are aligned with one another and arranged as an electrode stack, the end portions of the contact wires being positionable on top of or below the electrode stack such that the end portions overlap and ultrasonically solder to a contact area of at least one of the electrodes, or a tip end portion of the contact wire may be placed at an intermediate position between the top and the bottom of the electrode stack, in a later embodiment, on each side of the end portion Preferably, the contact regions are also ultrasonically welded to each other, whereby an alkaline metal/alkaline metal alloy to an alkali metal/alkaline metal alloy ultrasonic wave can also be formed.

Preferably, the end portion has a plurality of perforations, and the method comprises the steps of: i) placing a tip end portion of the contact wire and a tab of the at least one electrode to overlap the end portion and the tab; ii) The metal of the tab penetrates through the perforations of the end portion to bond the at least one electrode to the contact wire.

In step ii), the metal of the tab can be infiltrated through the perforation by extrusion and welding (for example, ultrasonic welding, thermal contact welding, laser welding or electromagnetic welding), which is beneficial in that the effect of the welding is The main sheet or foil of the at least one electrode does not produce significant thermal deformation or change, but concentrates the applied energy at the location of the tab.

The end portions of the contact wires may be substantially flat or planar, or may be of other shapes or configurations, based on, for example, the shape or configuration of any welding device used.

In some embodiments, a plurality of electrodes can be provided, each electrode comprising a sheet or foil of metal having a tab that is substantially identical from each sheet The locations are convex such that when the electrodes are aligned with one another and arranged in an electrode stack, the stacked tabs of the electrodes are substantially aligned.

In these embodiments, the end portion of the contact wire may be placed at the top of the tab of the electrode stack, below the tab of the electrode stack, or at an intermediate position between the top and the bottom (ie, there is at least one tab) Located above and at least one of the tabs is located below), the tab is then pressed together with the end portion of the hole and the first metal (of the tab) is permeated through the flat end portion of the contact wire having a hole (by the first The perforations of the two metal, or the tabs of the electrode stack, may be pressed together at the end of the perforated end placed on top of or below the extruded tab and before the penetration of step ii) is completed.

In an embodiment in which the electrode stack is provided, the extrusion and soldering steps cause the physical bonding of the tabs together, as well as the perforations that penetrate the contact wires. Preferably, the soldering step is ultrasonic welding, which preferably results in a soldering step. At least two sheets or foil tabs (preferably formed from an alkali metal or an alkali metal alloy) are welded together. In a preferred embodiment, ultrasonic welding is established at the end of at least one of the lithium tabs and the contact wires. In addition to the soldering between the sections, there is also a lithium-to-lithium soldering between at least two lithium tabs.

For the first metal, a particularly preferred metal is a lithium and lithium alloy which, because of its tendency to benefit from being an anode material for a rechargeable battery, and which is also soft and malleable, allows for contact wires when the extrusion and soldering steps are completed. There is a good connection at the end of the hole.

The end portion of the contact wire may be perforated, stamped or have a mesh-like or mesh-like pattern. It is important that when the first metal of the tab has sufficient ductility, it can be perforated to make the end portion Second metal forming A preferred single phase of the first metal is formed, which forms a close contact between the first metal and the second metal, and so does the contact wire and the electrode.

The greater the open rate or surface area of the end portion of the contact wire, the better the electrical (and physical) connection between the contact wire and the electrode, and the open rate of the end portion may be defined by the ratio of the open area of the end portion and the entire surface area. The opening rate of the end portion of the contact wire may be in the range of 5% to 95%.

The conductive wires contacting the wires may be substantially flat on their own, for example in the form of a strip, although other shapes are also useful, the conductive wires may be made of the same metal as the second metal forming the end portions, or different metals.

In this manner, by making the contact wires made of a different metal than the electrodes, a more secure connection can be formed, it being understood that the contact wires will be substantially exposed to the outside of the housing of the battery and must be well conductive. Made of a metal, but when exposed to gas or moisture, it is not highly reactive. Suitable metals include nickel, copper, stainless steel or different alloys.

Furthermore, the metal that contacts the wire, because it is only attached to the protruding tab of the electrode, is more suitable for direct exposure to the electrolyte when the battery is combined.

Still another advantage is that in the absence of the electrode as a whole, it is required to form or be disposed on a current collector made of a metal other than the first metal, and the at least one electrode can achieve good contact, in other words, the main portion of the electrode is exposed. For electrolytes consisting only of the first metal (such as lithium or lithium alloy), no copper or nickel or other current collector is required, which will add unwanted weight to the structure as a dendrites during the cycle. Substrate.

Furthermore, it is important that the second metal (of the contact wire) is selected such that it does not form an alloy with the metal of the (electrode) first metal, in order to A reduction in the amount of first metal that is achievable for the electrochemical system of the battery is avoided, for example, lithium will alloy with aluminum but not with nickel or copper.

In some embodiments, the electrodes are used for the battery to be provided as an anode, or a negative electrode, however, it will be appreciated that this method can also be applied to a second metal that is suitable for extrusion and soldering to the aforementioned apertured second metal. a cathode made of metal, or a positive electrode.

Embodiments of the present invention provide a negative electrode (anode) that eliminates the need for a current collector, and a method of forming a reliable physical connection between different lithium metal and contact wire assemblies, thereby facilitating lithium metal and contact wires There is good electrical contact between the materials.

In a preferred embodiment, an excess of lithium metal is used such that at the end of the life, a large amount of lithium metal is used as a current collector for the negative electrode, and the use of lithium as a current collector eliminates lithium metal and another Mechanical contact between a collector material.

In some embodiments, a plurality of electrodes may be provided, each electrode comprising a sheet or foil of a first metal having a tab projecting from substantially the same position of each of the sheets such that when the electrodes are aligned with each other and When arranged in an electrode stack, the stacked tabs of the electrodes are substantially aligned.

The lithium metal of the negative electrode in the region of the tab may form a single phase connection from the lithium electrode to the lithium electrode in the electrode stack, which is achieved by using the aforementioned extrusion and welding.

The contact wire or at least one end portion thereof may be thin (for example, having a thickness of 5 μm to 50 μm) or thick (for example, having a thickness of 50 μm to 10,000 μm).

The contact wires can be substantially linear or have a T- or L-shape.

The sheet or foil of the electrode may have a thickness of from 30 μm to 150 μm, for example from 50 μm to 100 μm before the soldering or bonding step.

The end portion of the contact wire may be an integral part of the contact wire (in other words, the other part of the self-contact wire is formed of the same material and integrated with it), or may be a separate metal component, and the non-essential part of the contact wire is the same material. And soldering with it (for example by ultrasonic welding, thermal contact welding, laser welding, electromagnetic welding or other welding methods).

The aforementioned electrode can be used for a battery or an electro-chemical battery, preferably a lithium battery, such as a lithium-sulfur battery, which can be used as an anode for the battery, in one embodiment, the battery comprises i) at least one as an anode as described above An electrode, and ii) at least one cathode, the cathode comprising sulfur as an active material, the anode and the cathode being in contact with the liquid electrolyte, the liquid electrolyte comprising a lithium salt dissolved in an aprotic organic solvent, and a separator disposed at the anode and Between the cathodes, the electrolyte can be sealed in a container to prevent it from flowing out. Preferably, the seal also prevents the alkaline metal of the sheet or foil from being exposed to the surrounding environment, so that at least part of the conductive wire can be obtained from the sealed container. Preferably, the weld between the contact zone or the tab and the end of the contact wire is preferably within the container.

12‧‧‧ first pliers

14‧‧‧ Second pliers

16‧‧‧ Positioning clip

18‧‧‧Workpiece

1‧‧‧electrode

2‧‧‧Tip

3‧‧‧Stacking of lithium anodes

4‧‧‧Contact wire

5‧‧‧Stacking

6‧‧‧Metal strip

7‧‧‧End

8‧‧‧Welding equipment

Embodiments of the present invention are described in more detail below in conjunction with the associated drawings, wherein: Figures 1a through 1c illustrate a selected position having an anode, a cathode and a tab, and three for a contact wire; Figures 2a to 2e show possible designs of the contact wires; Figure 3 shows the contact wires are ultrasonically welded to the tabs; and Figures 4a to 4d show an apparatus suitable for use in forming an ultrasonic welding.

Detailed description

A battery can be formed by the alternating stacking of a plurality of cathodes and anodes, each of the layers being separated by a separator, an ion channel being maintained by the presence of an electrolyte between each electrode, each The electrode 1 has a tab 2 projecting from its electrochemically active area and away from the edge of the spacer, the tabs 2 providing a stack 3 of lithium anodes bonded to each other and bonded to a first surface of a contact wire 4, The tab 2 is first folded and/or extruded, and a contact wire 4 is then placed on top of the tab 2 of the stack 5 (Fig. 1a) or bottom (Fig. 1b), or it can be placed on either lithium bump Between slices 2 (Fig. 1c).

The contact wires 4 may be in several forms (Figs. 2a to 2e), the body 6 being composed of a conductive metal strip, such as nickel, copper, stainless steel or some composite conductor, and the end portion 7 (the area to be welded) may be perforated, Mesh or stamped, or the end portion 7 may not have any perforations (not shown), the end portion 7 may be an integral part of the metal strip 6, or it may be a separate component welded to the metal strip 6, when the end portion 7 The separate components are welded to the metal strip 6, which may be a metal material different from the metal strip 6, the contact may be linear, T-shaped or L-shaped, and the holes may be diamond, ring, square, circular, polygonal or other. Any suitable shape.

The tab 2 and the contact wire 4 are then disposed on an ultrasonic welder Between the two welding devices 8 (Fig. 3), the ultrasonic welder then applies both pressure and ultrasonic waves to the weld zone, which causes several lithium layers 2 to fuse together to form a lithium-lithium layer weld, and, in addition, contact The wire 4 comprises perforations, the softened lithium permeates through the hole or mesh region 7 of the contact wire 4, the contact wire 4 is thus bonded to the lithium 2, and the mesh 7 is tightly surrounded by lithium, the mesh 7 of the contact wire 4 and the lithium electrode A high surface area contact between 1 produces a low resistance and mechanically strong electrical contact that will be bonded to the lithium anode 1 when the ultrasonic wave is stopped and the pressure is released.

Figures 4a through 4e illustrate an apparatus that can be used to form an ultrasonic weld that includes a first jaw 12 and a second discrete position that can be moved from a first discrete position to adjacent one another. The second jaw portion 14, the device also includes a positioning clip 16 for supporting the positioning of the workpiece 18 to be welded, and the second jaw portion 14 is arranged to vibrate at an ultrasonic frequency.

As shown in FIG. 4a, when the jaws are in the first disengaged position, the workpiece 18 to be welded is placed on top of the first jaw 12, and the second jaw 14 is then moved relative to the first jaw 12 to Applying a clamp pressure between the workpieces 18 to be welded, the second jaw portion 14 is then vibrated at the ultrasonic frequency (Fig. 4b), which pre-forms and rubs the workpieces 18 to be welded together to prepare the surface for preparation. The welding procedure is carried out, in which the workpieces 18 to be welded are joined together (see Fig. 4c), the first and second jaws 12, 14 are then separated, so that the finished workpiece 18 can be removed by the apparatus. (See Figure 4d).

Example 1

A linear nickel contact wire is used, which consists of a nickel strip of 50 μm thickness, and the end of the contact wire is unfolded to form a mesh, one having 60 Lithium anode batteries are combined, each lithium anode is 78 μm thick, a stack of lithium contact tabs protrudes from the battery, the lithium contact tabs are shaped and trimmed to form a flat weld area, and ensured in this stack Each tab, regardless of its position, uses a minimum amount of lithium, and the stack of formed lithium tabs is then placed between the soldering devices of an ultrasonic welder, which is then placed on the stack of lithium tabs. At the top, so that the mesh area overlaps with the flat lithium soldering area, the soldering conditions listed in Table 1 are then input into an AmTech 900B 40 kHz ultrasonic welder, a single solder is then performed, and each layer of 60 lithium layers The soldering, which is firmly secured to each other, is formed between the lithium and the contact wires, and the bonding is formed by the softened lithium passing through the mesh of the contact wires.

Example 2

A T-shaped contact wire is made by welding a piece of nickel tape (50 μm thick) to a piece of copper mesh, the mesh opening is close to 200×700 μm, and has a horizontal strip of 100 μm width, and the mesh is three of the width of the nickel strip. Double, the mesh is 5mm wide, the same as the welded area, the mesh is centered to form a T-shaped cross, and the ultrasonic welding is positioned by the welding A condition in Table 2, and the contact wire is placed in the super Between the welding equipment of the sonic welder, the meshed area falls into the welded area.

A battery with 20 lithium anodes is combined, each lithium anode A 78 μm thick, stack of lithium contact tabs protrudes from the cell, the lithium contact tabs are stacked and trimmed to form a flat soldered area, and each contact tab in the stack is ensured regardless of its position. A minimum amount of lithium is used.

The stack of lithium contact tabs is then placed on top of the contact wires between the soldering devices of the ultrasonic welder, and the "arms" of the copper mesh of the T-contact wires are then folded around the stack of lithium contact tabs, 2 The welding conditions listed in Welding B are then input into the AmTech 900B 40 kHz ultrasonic welder. A single weld is then carried out. Each of the 20 lithium layers is firmly welded to each other and firmly bonded to the lithium and contact wires. Between, this bonding is formed by the softened lithium passing through the mesh of the contact wires.

Example 3

An L-shaped contact wire is made by photochemical etching a piece of 100 μm thick stainless steel. The L-shaped upright section is a continuous steel foil, the L-shaped bottom section is a mesh pattern, and the mesh opening is 500. × 500 μm, the width of the bar is 100 μm, the bottom section of the L-shape is twice the width of the upright section, and the width of the bottom section is 5 mm, which is the same as the welded area.

A battery with 20 lithium anodes is combined, each lithium anode is 78 μm thick, and a stack of lithium contact tabs protrudes from the battery, the contact wires Between the top surface of the lithium contact tab lithium placed at the bottom of the bottom and the bottom surface of the remaining portion of the stack, the remaining portion of the lithium contact tab stack is pushed down onto the mesh region of the contact wire, the contact wire The raised mesh regions are folded over the stack of contact tabs, and the contact combinations are placed between the welding devices of the ultrasonic welder to cause the mesh regions to fall into the weld region.

The welding conditions listed in Table 3 were then input into an AmTech 900B 40 Hz ultrasonic wave welder. A single weld was then carried out. Each of the 20 lithium layers was firmly welded to each other and firmly bonded to the lithium and contact wires. Between, this bonding is formed by the softened lithium passing through the mesh of the contact wires.

Example 4 (nickel)

A rectangular contact wire is made by cutting a piece of flat nickel foil (100 μm thick) placed between the welding equipment of the ultrasonic welder so that the weld area is 1 mm from the edge of the tab, this welding The area is rectangular (20 x 6 mm).

A battery having nine lithium anodes is combined, each lithium anode is 100 μm thick, a stack of lithium contact tabs is protruded from the battery, and the lithium contact tabs are stacked and trimmed to form a flat soldering region, and Ensure that each contact tab in the stack uses a minimum amount of lithium regardless of its position, and the trimmed edge of the lithium tab completely covers the soldering of the nickel foil. Connect the area.

The lithium contact tab stack is then placed on top of the contact wires between the soldering equipment of the ultrasonic welder. The soldering conditions are listed in Table 4. This soldering device is a 40 kHz ultrasonic wave soldering machine from NewPower Ultrasonic Electronics Co., Ltd. A single weld was performed, and each of the nine lithium layers was firmly welded to each other, and a firm bond was formed between the lithium and nickel contact wires, and the bond was tested by the peel test procedure.

Example 5 (copper)

A rectangular contact wire is made by cutting a piece of flat copper foil (100 μm thick) placed between the welding equipment of the ultrasonic welder so that the weld area is 1 mm from the edge of the tab, this welding The area is rectangular (20 x 6 mm).

A battery with 9 lithium anodes is combined, each lithium anode 100 μm thick, a stack of lithium contact tabs protrudes from the cell, the lithium contact tabs are stacked and trimmed to form a flat soldered area, and each contact tab in the stack is ensured regardless of its position The minimum amount of lithium is used, and the edge of the lithium tab trim is completely covered in the soldered area of the copper foil.

The lithium contact tab stack is then placed on top of the contact wires between the soldering equipment of the ultrasonic welder. The soldering conditions are listed in Table 5. The soldering device is a 40 kHz ultrasonic wave soldering machine from NewPower Ultrasonic Electronics Co., Ltd. A single solder is then performed, and each of the nine lithium layers is firmly soldered to each other, and a firm bond is formed between the lithium and copper contact wires, and the bond is tested by the peel test procedure.

Example 6 (316 stainless steel)

A rectangular contact wire is cut from a flat piece of stainless steel foil Made of (58 μm thick), the contact wires were placed between the welding devices of the ultrasonic welder so that the weld area was 1 mm from the edge of the tab, which was rectangular (20 x 6 mm).

A battery having 9 lithium anodes is combined, each lithium anode is 100 μm thick, a stack of lithium contact tabs is protruded from the battery, a stack of lithium contact tabs is formed and trimmed to form a flat soldering region, and Make sure that each contact tab in this stack uses a minimum amount of lithium regardless of its position, and the trimmed edge of the lithium tab completely covers the soldered area of the stainless steel foil.

The lithium contact tab stack is then placed on top of the contact wires between the soldering equipment of the ultrasonic welder, the soldering conditions are listed in Table 6, and then entered into the 40 kHz ultrasonic wave soldering machine of NewPower Ultrasonic Electronics Co., Ltd. A single weld was performed, and each of the nine lithium layers was firmly welded to each other, and a firm bond was formed between the lithium and stainless steel contact wires, and the bond was tested by the peel test procedure.

Energy 350 J

Throughout the description and claims of the specification, "including" and "including" and its variants mean "including but not limited to" and it does not attempt (and does not exclude) other components, additions, components, and overall Or steps, throughout the description and claims of the specification, the singular also includes the plural, unless the context is otherwise required, especially when the superficial term is used, the specification will be understood as the intent and the singular, unless There are other needs in the text.

The topologies, integers, features, mixtures, chemical compositions or groups described herein for a particular purpose, embodiment or example will be understood to be applicable to any other purpose, embodiment or embodiment described herein. Examples, unless otherwise incompatible, all of the morphologies described in this specification (including any related claims, abstracts and schemas) and/or all steps of any such disclosed method or process may be combined with any In combination, at least some of these topologies and/or steps are excluded from each other.

1‧‧‧electrode

2‧‧‧Tip

3‧‧‧Stacking of lithium anodes

4‧‧‧Contact wire

5‧‧‧Stacking

Claims (8)

A method of connecting an electrode stack to a contact wire, wherein each electrode comprises a lithium or lithium alloy sheet formed with a tab, the tab providing a contact region projecting from substantially the same position of each sheet, such that The electrodes are substantially aligned when they are aligned with one another and are arranged in an electrode stack, and wherein the contact wires comprise a conductive line having a tip portion, the method comprising the steps of: i) placing the contact The end of the wire is at a) the top of the tab of the electrode stack b) below the tab of the electrode stack, or c) an intermediate position between the top and bottom of the electrode stack; ii) Ultrasonic welding of the contact region to the end portion to bond an electrode to the contact wire and to form a lithium-to-lithium or lithium alloy-to-lithium alloy solder between at least two of the tabs of the electrode stack. The method of claim 1, wherein the end portion of the contact wire is a metal or alloy formed from at least one of nickel, copper, and stainless steel. The method of claim 1 or 2, wherein the ultrasonic welding step is performed at a frequency of 30 to 50 Hertz (Hz). The method of claim 1 or 2, wherein the end portion is formed from a sheet of material comprising a plurality of perforations or no perforations. The method of claim 4, wherein the end portion is formed from a flat sheet of material, the sheet of material comprising a plurality of perforations The metal of the contact region passes through the perforations of the end portion to bond the at least one electrode to the contact wire during the ultrasonic welding step and/or by the ultrasonic welding step. The method of claim 4, wherein the end portion has no perforations. The method of claim 1 or 2, wherein the end portion of the contact wire is an integral part of the contact wire, or wherein the end portion of the contact wire is a separate metal component bonded to the contact wire. A lithium-sulfur battery comprising an electrode stacked to a contact wire, wherein each electrode comprises a lithium or lithium alloy sheet formed with a tab, the tab providing a contact region protruding from substantially the same position of each of the sheets, such that The tabs of the electrode stack are substantially aligned, and wherein the contact wires comprise a conductive line having a tip portion, whereby: i) the end portion of the contact wire is disposed on a) the bump of the electrode stack a top of the sheet, b) below the tabs of the electrode stack, or c) an intermediate position between the top and bottom of the electrode stack; ii) an electrode is ultrasonically welded and directly bonded to the contact lead And at least two tabs of the electrode stack are ultrasonically welded and directly bonded by a lithium-to-lithium or lithium alloy-to-lithium alloy soldering.