JP2008123800A - Connection structure and connection method for battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the connection structure and connection method for a battery connecting in series two or more batteries by connecting counter electrode terminals made of different kind of metals between adjoined batteries. <P>SOLUTION: In the connection method of the battery connecting in series the two or more batteries having a negative terminal made of copper or a copper alloy having high melting point and a positive terminal made of aluminum or an aluminum alloy having low melting point, the negative terminal and the positive terminal projecting in prescribed length from one end surface of the battery are bent in the opposite directions to form bent parts 4<SB>2</SB>, and 3<SB>2</SB>, and in the series connection portions, the bent part 3<SB>2</SB>of the negative terminal and a stiffening plate 5 made of a material having higher melting point than the positive terminal are brought into contact with the both surfaces of the bent part 4<SB>2</SB>of the positive terminal, and then the bent part 4<SB>2</SB>of the negative terminal, the bent part 3<SB>2</SB>of the positive terminal, and the stiffening plate 5 are resistance-welded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connection structure and a connection method between a plurality of batteries, and in particular, a battery connection structure and connection in which a plurality of batteries are connected in series by connecting counter electrode terminals made of different polarity metals between adjacent batteries. It is about the method.

  The electromotive force of each battery is low, and it is about 4 V even in a lithium ion battery that is said to have high electromotive force. For this reason, when a higher voltage is required, a plurality of batteries are connected in series to form an assembled battery, that is, a so-called module.

  In the case of modularizing a plurality of batteries, many methods are generally employed in which a positive electrode terminal and a negative electrode terminal of an adjacent battery are screwed together with bolts and nuts using a connecting member such as a bus bar. Also known is a method in which a pair of positive and negative terminals of each battery is extended, the extended terminals are bent together, and the positive and negative terminals of adjacent batteries are overlapped and welded together. (See Patent Document 1 below).

Further, for example, in a lithium ion battery, the positive electrode terminal is formed of aluminum or an aluminum alloy material, and the negative electrode terminal is formed of copper or a copper alloy material, which are different metals. Therefore, since it is difficult to weld and connect these dissimilar metals, a special connection member, that is, a belt-like sheet made of a clad material of copper and aluminum, is used. There is also known a method in which a plurality of lithium ion batteries are connected in series by connecting positive and negative terminals with the same metal using what has appeared (see Patent Document 2 below).
JP 2004-327311 A (paragraph [0020], FIG. 1) Japanese Patent Laid-Open No. 2002-151045 (paragraphs [0010] to [0013], FIG. 5)

  However, in the case of the screw connection described above, the bolt and nut may be loosened depending on the use environment. When the bolts and nuts are loosened, the electrical resistance between the terminal and the connecting member increases, causing output loss and generating heat to raise the internal temperature of the battery, which may cause deterioration of the battery. In addition, this screw connection requires a large number of bolts and nuts as the number of batteries to be modularized increases, so that a large number of bolts and nuts are required. Since man-hours are required, it becomes a factor which increases manufacturing cost.

  On the other hand, according to the welding connection method disclosed in Patent Document 1, since the connection member, the bolt, and the nut are unnecessary, the above-described problems can be solved. However, since this welding connection is made by bending the positive electrode terminal and the negative electrode terminal and welding the folded terminals to each other, it is easy if the positive electrode terminal and the negative electrode terminal are made of the same metal material. Although welding can be performed, welding is difficult when the positive electrode terminal and the negative electrode terminal are made of different metals. On the other hand, in order to solve such a problem, if the welding connection method disclosed in Patent Document 2 is adopted, a special connection member called a dissimilar metal clad material must be used. Such a connecting member is not easily available, and there is a risk that the cost will increase if an attempt is made to make it.

  The reason why it is difficult to employ ordinary welding means as a method for connecting different metals is as follows. That is, laser welding, resistance welding, ultrasonic welding, and the like are known as welding methods. When these welding methods are applied to, for example, the welding connection method disclosed in Patent Document 2 above, for example, in laser welding and resistance welding, the difference in heat capacity between connecting members becomes large. Alternatively, since the aluminum alloy is overwelded and spatter occurs, welding becomes difficult. In resistance welding, aluminum or aluminum alloy of the positive electrode terminal adheres to the electrode rod for welding, and stable welding becomes difficult. Furthermore, in ultrasonic welding, since the difference in material strength of the connecting member is large, the deformation of the positive electrode terminal during ultrasonic welding becomes large, so that welding becomes difficult.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to easily and reliably connect a positive electrode terminal and a negative electrode terminal made of different metal materials between adjacent batteries. It is another object of the present invention to provide a battery connection structure and a connection method capable of connecting a plurality of batteries in series.

  In order to achieve the above object, the battery connection structure of the present invention includes an electrode terminal on one side made of a first metal having a high melting point and an electrode terminal on the other side made of a second metal having a melting point lower than that of the first metal. In the battery connection structure in which a plurality of batteries are connected in series, the series connection locations are each made of a metal material in which the electrode terminal on the other side has a higher melting point than the electrode terminal on the one side and the second metal. It is characterized by being welded and connected in a state of being disposed between.

  Further, according to the present invention, in the battery connection structure, the electrode terminal on one side and the electrode terminal on the other side of the battery protrude from the one end surface of the battery by a predetermined length and are bent in opposite directions. The series connection points are welded in a state where the bent portion of the electrode terminal on the other side is disposed between the bent portion of the electrode terminal on the one side and the cover plate, respectively. .

  In the battery connection structure according to the present invention, the battery is a lithium ion battery, the first metal is copper or a copper alloy, the second metal is aluminum or an aluminum alloy, and the contact plate is It is one kind selected from copper, copper alloy, nickel and stainless steel. In this case, the one electrode terminal is a negative terminal, and the other electrode terminal is a positive terminal.

  Further, according to the battery connection method of the present invention, a plurality of batteries having one electrode terminal made of a first metal having a high melting point and the other electrode terminal made of a second metal having a lower melting point than the first metal are connected in series. In the connecting method of the battery to be connected, in the series connection place, the contact plate made of a metal material having a melting point higher than that of the one side electrode terminal and the second metal is brought into contact with both surfaces of the other side electrode terminal, Next, the electrode terminal on the one side, the electrode terminal on the other side, and the cover plate are simultaneously resistance-welded.

  According to the present invention, in the battery connection method, the one side electrode terminal and the other side electrode terminal protruding from the one end surface of the battery by a predetermined length are bent in opposite directions to form a bent portion. In the series connection place, the bent portion of the electrode terminal on one side and the address plate are brought into contact with both surfaces of the bent portion of the electrode terminal on the other side, respectively, and then the bent portion of the electrode terminal on the one side, The bent portion of the electrode terminal on the other side and the cover plate are simultaneously resistance-welded.

  Further, the present invention is characterized in that, in the battery connection method, a protruding portion toward the bent portion side of the other electrode terminal is formed on at least one of the bent portion of the one electrode terminal and the cover plate. To do.

  In the battery connection method, the present invention is characterized in that a slit or a groove is provided around the welded portion of the bent portion of the electrode terminal on the other side.

  In the battery connection method according to the present invention, the battery is a lithium ion battery, the first metal is copper or a copper alloy, the second metal is aluminum or an aluminum alloy, and the contact plate is It is one kind selected from copper, copper alloy, nickel and stainless steel.

  By providing the above configuration, the present invention has the following excellent effects. That is, according to the battery connection structure of the present invention, even if the positive electrode terminal and the negative electrode terminal of the battery are made of different metals, the other electrode terminal made of the second metal having a melting point lower than that of the first metal is the first. Since it is disposed in a state of being sandwiched between one electrode terminal made of one metal and an address plate made of a metal material having a higher melting point than the second metal, the second metal having a lower melting point than the first metal The electrode terminal on the other side is not sputtered even if it is overmelted, has high welding strength and high reliability, and does not use a special material, so that a low-cost battery connection structure can be obtained. .

  According to the battery connection structure of the present invention, the electrode terminal on one side and the electrode terminal on the other side of the battery protrude from the one end surface of the battery by a predetermined length and are bent in opposite directions. Therefore, it is possible to achieve a state where the bent portion of the electrode terminal on the other side and the bent portion of the electrode terminal on the one side are in contact with each other at the series connection place only by aligning a plurality of batteries in the same direction. No excessive force is applied to each electrode terminal after welding. Therefore, in addition to the effect of the present invention, a battery connection structure with a simple structure and higher reliability can be obtained.

  According to the battery connection structure of the present invention, in the lithium ion battery, copper or a copper alloy having a high melting point is conventionally used for the negative electrode terminal, and aluminum or aluminum alloy having a melting point lower than that for the negative electrode terminal is conventionally used. However, since the contact plate is made of one selected from copper, copper alloy, nickel and stainless steel, which has a higher melting point than the positive electrode terminal, the positive electrode is made of aluminum or aluminum alloy having a low melting point. The terminal is placed in a state of being sandwiched between the negative electrode terminal having a high melting point and the cover plate, and the aluminum or aluminum alloy that has become overmelted during welding is not sputtered, so the welding strength is strong and reliable. Large, yet no special materials are used, so low-cost lithium-ion battery connections Concrete can be obtained.

  Furthermore, according to the battery connection method of the present invention, even if the positive electrode terminal and the negative electrode terminal of the battery are made of different metals, the electrode terminal on the other side made of the second metal having a melting point lower than that of the first metal. Since resistance welding was performed while sandwiched between one electrode terminal made of one metal and a metal plate made of a metal material having a melting point higher than that of the second metal, the other side made of the second metal that was overmelted during welding The electrode terminal is not sputtered and the other electrode terminal made of the second metal does not directly touch the electrode rod for resistance welding, so that the other electrode terminal made of the second metal is used for resistance welding during resistance welding. A plurality of batteries can be connected in series reliably and inexpensively without using a special connecting member.

  Also, according to the battery connection method of the present invention, the one side electrode terminal and the other side electrode terminal protruding from the one end surface of the battery by a predetermined length are bent in opposite directions to form a bent portion. By simply aligning a plurality of batteries in the same direction, the bent portion of the other electrode terminal and the bent portion of the one electrode terminal can be brought into contact with each other at the series connection point. In addition, the bent portion of the electrode terminal on the one side and the address plate are brought into contact with both surfaces of the bent portion of the electrode terminal on the other side at the series connection point, and then the bent portion of the electrode terminal on the one side In addition, since the bent portion of the electrode terminal on the other side and the cover plate are resistance-welded at the same time, resistance welding can be easily performed, and excessive force is not applied to each terminal during and after welding. Therefore, a plurality of batteries can be connected in series easily and with high reliability.

  Further, according to the battery connection method of the present invention, since the protruding portion toward the bent portion side of the other electrode terminal is formed on at least one of the one electrode terminal and the cover plate, the current during resistance welding is Since it concentrates on this protrusion part, resistance welding can be performed now efficiently. In addition, according to the battery connection method of the present invention, since the slit or groove is provided around the welded portion of the bent portion of the electrode terminal on the other side, the second metal having a lower melting point than the first metal melted during welding. Flows into the slit or groove, so that the molten second metal does not protrude and flow out to the outside.

  Further, according to the battery connection method of the present invention, in the lithium ion battery, copper or copper alloy having a high melting point is conventionally used for the negative electrode terminal, and aluminum or aluminum alloy having a melting point lower than that of the negative electrode terminal is conventionally used. However, since the contact plate is made of one selected from copper, copper alloy, nickel and stainless steel, which has a higher melting point than the positive electrode terminal, the positive electrode is made of aluminum or aluminum alloy having a low melting point. The terminal is placed in a state of being sandwiched between a negative electrode terminal having a high melting point and a cover plate, and the aluminum or aluminum alloy that has become overmelted during resistance welding is not sputtered and the molten aluminum or aluminum alloy is resistance welded. No longer sticks to the electrode rod, and the welding strength is strong and reliable. Hear, moreover, it can be connected in series with lithium-ion battery at a low cost because it is not necessary to use special materials.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery connection structure and a connection method for embodying the technical idea of the present invention, and the present invention is specified to this battery connection structure and connection method. And other embodiments within the scope of the claims are equally applicable. 1 is an external perspective view of a battery module to which the connection structure according to the first embodiment is applied, FIG. 2 is an external perspective view of one battery constituting the battery module of FIG. 1, and FIG. It is an external appearance perspective view of a board, FIG.3 (b) is an enlarged side view at the time of forming the connection structure of the battery of Example 1 by a resistance welding method. 4 shows the connection structure according to the second embodiment, FIG. 4 (a) is a longitudinal sectional view before welding, FIG. 4 (b) is a longitudinal sectional view after welding, and FIG. It is a longitudinal cross-sectional view before welding in the modification of this connection structure.

Cell module 1, as shown in FIG. 1, a plurality, for example three lithium ion batteries are modularized in 2 ₁ to 2 ₃ (hereinafter, referred to as cells). As shown in FIG. 2, each of these batteries has a plate-like positive electrode terminal 3 and a negative electrode terminal 4 protruding from the upper surface 2A of the metal casing 2B. In the metal casing 2B, a positive electrode plate, a negative electrode plate, a separator and an electrolytic solution (not shown) are accommodated.

  In the positive electrode plate, a positive electrode active material mixture containing, for example, a lithium composite oxide is applied in a thin layer on both sides of a current collector made of aluminum or aluminum alloy foil, and the current collector made of aluminum or aluminum alloy foil is the same. It is connected to a positive electrode terminal 3 made of aluminum or an aluminum alloy material. Similarly, the negative electrode plate is coated with a negative electrode active material mixture containing, for example, a carbon material in a thin layer on both sides of a current collector made of copper or copper alloy foil, and the current collector made of copper or copper alloy foil is Similarly, it is connected to a negative electrode terminal 4 made of copper or a copper alloy material.

  The positive electrode terminal 3 and the negative electrode terminal 4 have a predetermined width and thickness, respectively, and both are formed in a flat plate shape having substantially the same length. Further, as shown in FIG. 3A, the contact plate 5 is made of a plate material having substantially the same size and thickness as the bent portions of the positive electrode terminal 3 and the negative electrode terminal 4, and has a higher melting point than the positive electrode terminal. One selected from copper, copper alloy, nickel and stainless steel is used. Here, the same copper or copper alloy material as that of the negative electrode terminal 4 was used.

Individual batteries are connected in the following procedure. First, the positive electrode terminal 3 and the negative electrode terminal 4 are bent in the opposite directions from each other so that the negative electrode terminal 4 overlaps the positive electrode terminal 3 when the _three batteries 2 ₁ to 23 are provided side by side. That is, as shown in FIG. 1, the positive electrode terminal 3, the vertical portion 3 ₁ and the composed vertical portion of the drawing is bent to the right bent portion 3 ₂ which substantially 90 degrees, the negative terminal 4 also vertical portion 4 ₁ the vertical portion consists bent portion 4 ₂ which was bent at about 90 degrees in the drawing on the left from the vertical portion 3 ₁ is slightly higher than the vertical portion 4 ₁ of the negative terminal 4 of the positive terminal 3 is as low as Yes.

Then, three cells 2 ₁ arrayed to 2 ₃ to the polarity of the terminals facing each other between adjacent cells is different, bent portion of the bent portion 3 ₂ and the negative electrode terminal 4 of the positive terminal 3 of an adjacent cell 4 Make ₂ overlap. In this state, the vertical portion 3 ₁ is slightly higher than the vertical portion 4 ₁ of the negative terminal 4 of the positive terminal 3 is low, always has a positive terminal 3 is disposed below the negative terminal 4. In this state, the wear plate 5 having the shape shown in the bent portion 3 ₂ of the lower of the positive terminal 3 in FIGS. 3 (a) is brought into contact, then as shown in FIG. 3 (b), the wear plate 5, the lower electrode bar 6 </ _b > A of the electric welding machine is brought into contact with the lower surface of the electric power source 5, and the upper electrode bar 6 </ _b > B is brought into contact with the upper part of the bent portion 42 of the negative electrode terminal 4.

Configuration of the connection portion C ₁ in this state, the bent portion of the negative terminal from above consisting of the upper electrode bar 6B- copper or copper alloy material 4 ₂ - positive terminal made of aluminum or aluminum alloy material bent portion 3 ₂ - copper or The contact plate 5 made of a copper alloy material is used as the lower electrode rod 6A. In this state, resistance welding is performed by flowing a predetermined current between the lower electrode rod 6A and the upper electrode rod 6B from an electric welding apparatus (not shown).

Then, at the time of welding, the welding in a state where the bending portion 3 ₂ of the positive electrode terminal 3 made of aluminum or an aluminum alloy material is sandwiched between the folded portion 4 ₂ and wear plate 5 of the negative electrode terminal 4 made of copper or a copper alloy material since the, for to no electrode rod 6A 6B is a bending portion 3 ₂ of the positive electrode terminal 3 not in direct contact, with adhesion can be prevented in the aluminum or aluminum alloy on the electrode rod 6A-6B, aluminum or aluminum alloy Even if it is overmelted, it is not sputtered to the surroundings.

Therefore, even if the positive electrode terminal 3 and the negative electrode terminal 4 are formed of different metals by the configuration of the connection portion C ₁ , welding is performed by using the contact plate 5 made of a material having a melting point higher than that of the positive electrode terminal 3. Because it is strong and reliable, and it does not require the use of special materials, lithium-ion batteries can be connected in series at low cost. In this connection structure C _1, so as to slightly higher than the vertical portion 4 ₁ of the vertical portion 3 ₁ of the positive electrode terminal 3 negative terminal 4 becomes lower, bent from the upper negative electrode terminal 4 4 ₂ - bending portion 3 ₂ of the positive electrode terminal 3 - were arranged in the order of the wear plate 5, on the contrary, slightly higher vertical portion 3 ₁ of the positive electrode terminal 3 from the vertical portion 4 ₁ of the negative electrode terminal 4 is as increases, bending portion 3 ₂ of wear plate 5 positive terminal 3 in order from above - may be arranged so that the folded portion 4 ₂ of the order of the negative electrode terminal 4. In short, it is not sufficient if bending portion 3 ₂ of the positive electrode terminal 3 is disposed between the bent portion 4 ₂ and wear plate 5 of the negative terminal 4.

Next, the connection structure C2 of Example ₂ will be described with reference to FIG. The connection structure C ₂ of the _second embodiment is different from the connection structure C _{1 of the} first embodiment shown in FIG. 3B in that the bent portion 3 _{2 of} the positive electrode terminal 3, the bent portion 4 ₂ of the negative electrode terminal 4, and the cover plate 5. Since the configuration is substantially the same except that a part of the configuration is different, the same reference numerals are assigned to the common configurations and the description thereof is omitted.

Connection structure C ₂ of the second embodiment, each projecting portion 4a in a position facing the welding to the bent portion 4 ₂ and wear plate 5 of the negative terminal 4 and 5a provided, the positive electrode terminal 3 of the bent portion 3 ₂ of the weld It has a configuration in which slits 3a and 3a are formed as regions where molten aluminum or aluminum alloy can flow into the periphery. In this case, as shown in FIG. 4 (a), it is formed such that the lower surface projects negative terminal 4 of the bent portion 4 ₂ of the protruding portion 4a is recessed to the upper surface of the substantially central portion of the bent portion 4 ₂ Further, the protruding portion 5a of the contact plate 5 is formed such that the lower surface is depressed and the upper surface side protrudes.

Here, it arranged as the polarity of the terminals facing each other between adjacent cells is different, as well as to bent portion 4 ₂ of the bending portion 3 ₂ and the negative electrode terminal 4 of the positive terminal 3 of adjacent cells overlap, placing the wear plate 5 to the bent portion 3 ₂ of the lower positive terminal 3, 4 as shown in (a), the projecting portion 5a of the bent portion 4 ₂ of the protruding portion 4a and the wear plate 5 of the negative terminal 4 together are opposed to each other, the protruding portion 4a of the bent portion 4 ₂ of the negative electrode terminal 4 is located above the bent portion 3 ₂ of the positive electrode terminal 3, the bending portion 3 of the projecting portion 5a of the wear plate 5 is the positive terminal 3 ₂ is located below.

If resistance welding is performed in this state, the resistance welding current concentrates on the protrusions 4a and 5a, so that resistance welding is performed efficiently. Further, positive electrode terminal 3 of the bending portion 3 ₂ is provided with slits 3a, since the flow into molten aluminum or aluminum alloy in 3a, with aluminum is it is eliminated sputtering to the surroundings even when excessive melting, respectively the copper or copper it is not necessary to aluminum or aluminum alloy comes protrude from between the bent portion 4 ₂ and wear plate 5 of the negative electrode terminal 4 made of an alloy material.

In Example 2, the bending portion 3 ₁ of the welded portion around the slit 3a of the positive terminal 3, an example in which a 3a, as shown in FIG. 5, be provided with a groove 3a ', 3a' Good. Such grooves 3a ′ and 3a ′ can provide the same effects as the slits 3a and 3a. In Example 2, an example of forming the projecting portion on both of the folded portion 4 ₂ and wear plate 5 of the negative terminal 4, the same effect even if only provided a protrusion to either have obtained It is done.

  Although the present invention has been described in detail in the above embodiment, the present invention is not limited to this, and the person who has ordinary knowledge in the technical field to which the present invention belongs will depart from the spirit and spirit of the present invention. Can be modified or changed without any change. For example, in the present embodiment, a connection structure of a plurality of lithium ion batteries has been described. However, this connection structure is not limited to a lithium ion battery, and may be employed when, for example, an electric double layer capacitor is connected.

1 is an external perspective view of a battery module to which a connection structure according to Example 1 is applied. It is an external appearance perspective view of one battery which comprises the battery module of FIG. FIG. 3A is an external perspective view of a cover plate, and FIG. 3B is an enlarged side view when the battery connection structure of Example 1 is formed by resistance welding. The connection structure which concerns on Example 2 is shown, Fig.4 (a) is a longitudinal cross-sectional view before welding, FIG.4 (b) is a longitudinal cross-sectional view after welding. It is a longitudinal cross-sectional view before welding in the modification of the connection structure of Example 2.

Explanation of symbols

1 battery module _{2, 2} 1 ~ ₂ lithium ion battery 2B metal casing 3 positive electrode terminal _{3 1} vertical section _{3 2} bent portion 3a slit 3a 'groove 4 negative terminal 4a protruding portion _{4 1} a vertical section _{4 2} folded portion 5 wear plate 5a Protruding part 6A, 6B Electrode rod

Claims (8)

In a battery connection structure in which a plurality of batteries having one electrode terminal made of a first metal having a high melting point and the other electrode terminal made of a second metal having a melting point lower than that of the first metal are connected in series,
Each of the series connection locations is weld-connected in such a state that the other electrode terminal is disposed between the one electrode terminal and an address plate made of a metal material having a melting point higher than that of the second metal. A battery connection structure. The electrode terminal on one side and the electrode terminal on the other side of the battery are each protruded from the one end surface of the battery by a predetermined length and are bent in opposite directions to each other,
The series connection location is welded in a state where the bent portion of the electrode terminal on the other side is disposed between the bent portion of the electrode terminal on the one side and the cover plate, respectively. Item 6. A battery connection structure according to Item 1.   The battery is a lithium ion battery, the first metal is copper or a copper alloy, the second metal is aluminum or an aluminum alloy, and the address plate is selected from copper, copper alloy, nickel, and stainless steel. The battery connection structure according to claim 1, wherein the battery connection structure is one type. In a battery connection method of connecting a plurality of batteries having one electrode terminal made of a first metal having a high melting point and the other electrode terminal made of a second metal having a melting point lower than that of the first metal in series,
In the series connection place, contact surfaces made of a metal material having a melting point higher than those of the one side electrode terminal and the second metal, respectively, on both surfaces of the other side electrode terminal,
Next, the battery connecting method, wherein the electrode terminal on one side, the electrode terminal on the other side, and the cover plate are simultaneously resistance-welded. Bending the one side electrode terminal and the other side electrode terminal protruding in a predetermined length from one end surface of the battery in opposite directions to form a bent portion;
In the series connection place, the bent portion of the electrode terminal on one side and the contact plate are brought into contact with both surfaces of the bent portion of the electrode terminal on the other side, respectively.
5. The battery connection method according to claim 4, wherein the bent portion of the electrode terminal on one side, the bent portion of the electrode terminal on the other side, and the cover plate are simultaneously subjected to resistance welding.   6. The battery connection method according to claim 5, wherein a protruding portion toward the bent portion side of the other electrode terminal is formed on at least one of the bent portion of the one electrode terminal and the cover plate.   The battery connection method according to claim 6, wherein a slit or a groove is provided around a welded portion of the bent portion of the electrode terminal on the other side.   The battery is a lithium ion battery, the first metal is copper or a copper alloy, the second metal is aluminum or an aluminum alloy, and the address plate is selected from copper, copper alloy, nickel, and stainless steel. The battery connection method according to claim 4, wherein the battery connection method is one type.

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