JPH08167407A - Electrode body of sealed rectangular battery and its manufacture - Google Patents

Abstract

PURPOSE: To improve productivity and reliability or the like. CONSTITUTION: Binding parts 5 by integrally forming respective electrode plates 3 by wrapping in and binding respective electrode leads 3a together after the electrode plates 3 are layered, are provided. A welding means is brought into contact with the electrode leads 3a through the binding part 5 after they are integrally formed by the binding part 5, and the respective electrode plates 3 are integrally welded to each other by this welding means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electrode body in a sealed prismatic battery and a method for manufacturing the electrode body.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of an electrode body in a conventional sealed prismatic battery, and FIG. 7 is an exploded perspective view of the electrode body. 6 and 7, the electrode body 51 has a schematic structure in which a plurality of electrode plates 53 made of a metal foil such as copper are laminated on a reinforcing plate 52. Further, electrode leads 53a are formed at the same positions on each electrode plate 53, and an insulating active material 54 is applied to the surface excluding the electrode leads 53a. On the other hand, the reinforcing plate 52 is
Similarly, it is made of a rigid metal plate and has substantially the same size and shape as the electrode plate 53. 6 and 7
Shows the electrode body 51 having only one pole, but normally, two electrode bodies, that is, the electrode body for the positive electrode indicated by the solid line in FIG. 6 and the electrode body for the negative electrode indicated by the alternate long and short dash line are simultaneously formed. The electrode plate for the positive electrode and the electrode plate for the negative electrode are alternately stacked one by one by changing the position of the electrode lead for each pole to the left and right, and bound for each electrode body. Further, when a predetermined number of electrode plates are stacked, resistance welding is performed between the electrode leads 53a of each electrode plate 53 arranged vertically for each electrode, and between the electrode leads 53a and the reinforcing plate 52. The electrode body 51 in which the electrode plate 53 and the reinforcing plate 52 are fixed and integrated is manufactured. In FIG. 6, reference numeral 55
The portion indicated by means the resistance welded portion.

[0003]

As described above, according to the conventional structure and method, the portion of the electrode lead 53a of the metal foil on which the active material 54 is not applied is directly fixed to the reinforcing plate 52 by resistance welding to be integrated. In general, the metal foil on which the electrode leads 53 are formed is often very thin and has a thickness of about 10 μm. Therefore, the foil is melted during resistance welding and is easily attached to the welding electrode. Therefore, there are the following problems. Welding electrode maintenance increases. The range of welding setting conditions is narrow, making setting difficult. Productivity decreases due to the cause of. Workability is poor because the metal foils (the portions of the electrode leads 53a) are not bound together. Since only the foil is around the weld nugget, peeling or cracking is likely to occur and reliability is poor.

The present invention has been made in view of the above problems, and an object thereof is to provide an electrode body for a sealed prismatic battery and a method for manufacturing the same, which can improve productivity and reliability. To do. Furthermore, other purposes will be clarified one after another in the content described below.

[0005]

[Problems to be Solved by the Invention]

According to the present invention, the object of the present invention is to provide a sealed prismatic battery having a plurality of electrode plates having electrode leads laminated on a reinforcing plate as the structure of the electrode body. In the electrode body of (1), after stacking the electrode plates, the electrode leads are wrapped together and bound together, and the electrode plates are provided with a binding component that is integrated and abutted through the binding component. This is achieved by adopting a structure in which the electrode plates are welded and integrated by the welding means. Further, in carrying out the present invention, it is also possible to use the binding component having a substantially U-shaped cross section or a ring shaped cross section.

The object of the present invention is, as a method of manufacturing the electrode body, to manufacture an electrode body in a sealed prismatic battery in which a plurality of electrode plates having electrode leads are laminated on a reinforcing plate. In the method, after stacking the electrode plates, the electrode leads are wrapped and bound together by a binding component, and after the binding, a welding means is brought into contact with the electrode lead through the binding component, and the welding means The above is achieved by welding and integrating the electrode plates.

[0007]

According to this, the electrode leads are bound by the binding parts, and after binding, the welding is performed through the binding parts, and the welding electrodes and the like do not directly contact the electrode leads, so that the electrode leads are formed. It is possible to prevent the applied foil from adhering to the welding electrode or the like. Therefore, it is possible to reduce the frequency of maintenance of the welding electrode and the like and extend the life thereof. Also, the range of welding setting conditions has expanded,
Conditions can be set easily. Further, since the electrode leads are bound by the binding parts, the work at the time of welding by resistance welding or the like becomes simple. In addition, since the binding component is wrapped around the welded portion, damage is less likely to be transmitted to the periphery of the welded portion during welding, and peeling or cracking can be prevented.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show an embodiment of the present invention, FIG. 1 is a perspective view of an electrode body in the sealed prismatic battery, FIG. 2 is a schematic sectional view taken along the line AA of FIG.
FIG. 3 is an exploded perspective view of the electrode body.

1 to 3, the electrode body 1 is
For example, a plurality of electrode plates 3 made of a metal foil such as oxygen-free copper having a thickness of about 1 micron are laminated, bound by a binding component 5 and caulked and fixed, and then placed on a conductive reinforcing plate 2. Further, the binding component 5 and the reinforcing plate 2 are welded and fixed to each other. Further, electrode leads 3a are formed at the same position on each electrode plate 3, and an insulating active material 4 is applied to the surface excluding the electrode leads 3a. on the other hand,
The reinforcing plate 2 is also made of a metal plate having rigidity and is made to have substantially the same size and shape as the electrode plate 3.

Next, a procedure for manufacturing the electrode body 1 will be described. Prior to the description, referring to the drawings disclosed in FIGS. 1 and 3, FIG. 1 and FIG. 3 show the electrode body 1 having only one pole. However, in this sealed prismatic battery, Usually, two electrode bodies, that is, an electrode body for a positive electrode shown by a solid line in FIG. 1 and an electrode body for a negative electrode shown by a chain line are formed at the same time, and an electrode plate for a positive electrode and an electrode plate for a negative electrode are formed. However, the position of the electrode lead 3a is changed leftward and rightward for each pole, and the electrode leads 3a are alternately stacked one by one.

When a predetermined number of electrode plates 3 on each side are stacked, the binding component 5 is first attached to each electrode side. This bundling component 5 is electrically conductive, and before attachment, as shown in FIG.
It has a pair of vertical portions 5b which are bent downward at substantially right angles from both left and right sides of a, and has a substantially U-shaped cross section. The binding component 5 includes a pair of vertical portions 5 on both left and right sides of the stacked electrode leads 3a.
The parts 5c (see FIG. 3), which are attached from above the electrode lead 3a so as to be sandwiched between the electrodes 5b and 5b, and which are further projecting from the lower side of the electrode lead 3a, are directed inward. And bend it at a right angle
The part 5c is pressed from the lower side of the electrode lead 3a to crimp the entire laminated electrode lead 3a. As a result, the parts of the electrode leads 3a are temporarily bundled together to form an integrated laminated electrode plate. Then, as shown in FIG. 2, the reinforcing plate 2 is placed in close contact with the lower side of the laminated electrode plate,
In this state, the electrode lead 3a is set between the welding electrodes 10a and 10b of the resistance welding machine. Further, this portion is sandwiched between the welding electrodes 10a and 10b,
A welding current is applied to 10b to weld between the electrode leads 3a and between the electrode leads 3a and the binding component 5 and the reinforcing plate 2. Then, the electrode body 1 on the one electrode side is thereby formed. In FIG. 1, a portion indicated by reference numeral 6 indicates a resistance-welded portion. Further, if this work is similarly performed for the other electrode side, a sealed prismatic battery having an electrode body in which the positive electrode and the negative electrode are integrated can be formed.

Therefore, according to the electrode body 1 of the sealed prismatic battery of the present embodiment, the electrode lead 3a is wrapped with the binding component 5 so that the electrode lead 3a is bound, and after the binding, resistance welding is performed through the binding component 5. Since the welding electrodes 10a and 10b are prevented from coming into direct contact with the electrode leads 3a, the copper foil forming the electrode leads 3a is welded to the welding electrodes 10a and 1b.
It can be prevented from adhering to 0b or the like.

In the above embodiment, the electrode lead 3a is used.
The welding between the electrode lead 3a, the binding component 5 and the reinforcing plate 2 has been described by resistance welding, but other welding may be used. Further, in the above embodiment, the structure in which the electrode leads 3a are bound by using the binding component 5 having a U-shaped cross section is disclosed. However, other shapes such as those shown in FIGS. 4 and 5 are formed. It is also good. That is, the structure shown in FIG. 4 is a bundling component having a round cross section, and the structure shown in FIG. 5 is a bundling component having a rectangular cross section. Each of the binding parts is used by inserting the electrode lead 3a in a laminated state into the ring-shaped binding part 5 and then caulking to temporarily bind the electrode leads 3a. The work is the same as in the above embodiment.

[0014]

As described above, according to the present invention,
The electrode lead is bound by the binding component, and after binding, welding is performed through the binding component, and the welding electrode etc. does not directly contact the electrode lead, so the foil forming the electrode lead is the welding electrode etc. Can be prevented from adhering to. Therefore, it is possible to reduce the frequency of maintenance of the welding electrode and the like and extend the life thereof. In addition, the range of welding setting conditions is widened and the condition setting becomes easier. Further, since the electrode leads are bound by the binding parts, the work at the time of welding by resistance welding or the like becomes simple. Thereby, productivity can be improved. In addition, since the binding parts are wrapped around the welded part, damage is less likely to be transmitted to the periphery of the welded part during welding, peeling and cracks can be prevented, and effects such as improved reliability are expected. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of an electrode body in a sealed prismatic battery shown as an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is an exploded perspective view of the electrode body shown in FIG.

FIG. 4 is a perspective view of a main part of a reinforcing plate showing a modified example of the present invention.

FIG. 5 is a perspective view of a main part of a reinforcing plate showing another modification of the present invention.

FIG. 6 is a perspective view showing an example of an electrode body in a conventional sealed prismatic battery.

7 is an exploded perspective view of the electrode pair shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode body 2 Reinforcement plate 3 Electrode plate 3a Electrode lead 4 Active material 5 Binding component

Claims (4)

[Claims] 1. An electrode body for a hermetically sealed prismatic battery, wherein a plurality of electrode plates having electrode leads are laminated on a reinforcing plate, wherein the electrode plates are laminated and then the electrode leads are wrapped together and bound. The electrode plates are integrated with each other, and the electrode plates are welded and integrated by a welding means abutted via the binding parts. Sealed prismatic battery electrode body. 2. The electrode body for a sealed prismatic battery according to claim 1, wherein the binding component has a substantially U-shaped cross section. 3. The electrode body for a sealed prismatic battery according to claim 1, wherein the binding component has a ring-shaped cross section. 4. A method of manufacturing an electrode body in a sealed prismatic battery, wherein a plurality of electrode plates having electrode leads are laminated on a reinforcing plate, wherein the electrode plates are laminated and then each electrode lead is formed by a binding component. And encapsulating them together to bind them together, and after this binding, the electrode leads are brought into contact with the welding means through the binding parts, and the electrode means are welded between the electrode plates to integrate them. A method for manufacturing an electrode body for a sealed prismatic battery, comprising: