JP4802365B2 - battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery in which an electrode winding body in which a positive and negative electrode sheet electrode material is formed in a roll shape is housed in a hollow cylindrical battery container, and terminals of positive and negative electrodes are provided on one end face of the battery container.
[0002]
[Prior art]
As a battery in which a sheet-like electrode material for positive electrode and a sheet-like electrode material for negative electrode are wound through a separator to form an electrode winding body, and the electrode winding body is housed in a battery container, Japanese Patent Application Laid-Open No. Hei 10 The one disclosed in Japanese Patent No. -83833 is known.
[0003]
[Problems to be solved by the invention]
However, in the example of the battery disclosed in the above-mentioned publication, a current collector connected to each of the positive and negative electrode members of the electrode winding body is connected to a positive electrode terminal provided on the lid of the battery container using a lead wire and Connected to each negative terminal. As described above, in the conventional battery, the electrode winding body housed in the battery container is such that each of the positive and negative current collectors is connected to the positive and negative terminals by the lead wires, and thus the vibration is applied to the battery. In this case, the electrode winding body easily moves in the battery container.
[0004]
The objective of this invention is providing the battery which can prevent the movement of the electrode winding body in a battery container.
[0005]
[Means for Solving the Problems]
A description will be given in association with FIGS. 1 and 3 showing an embodiment of the invention.
(1) According to the first aspect of the present invention, the electrode winding body 2 formed by attaching the positive and negative bipolar sheet-like electrode materials 201 and 202 laminated on the shaft core 3 with the separator 203 interposed therebetween is provided with a bottomed cylindrical member. 1 and a lid 7 that closes the opening of the bottomed cylindrical member 1 is applied to a battery housed in a battery container. A hollow tube 3 is used for the shaft core, and the electrode winding body 2 and the lid 7 An upper current collector 4a connected between the electrode member 201 and a lower portion connected between the electrode winding body 2 and the bottom of the bottomed tubular member 1 and connected to the electrode member 202. A current collector 4b, a first conductive rigid body 6 fixed to the upper current collector 4a, penetrating the lid 7 and projecting outside the battery container, and the hollow so as to extend in the axial direction of the tube 3 the tube material and the contacts are disposed within one end fixed to the lower current collector 4b, the outside of the battery case and the other end through a lid 7 And a second conductive rigid 5 fixed to the cover 7 so as to protrude to achieve the above object.
(2) The invention according to claim 2 is the battery according to claim 1, wherein the upper current collector 4 a is fixed to the tube material 3, and the first conductive rigid body 6 is fixed to the lid 7 via the insulating member 9. It is a thing.
(3) The invention of claim 3 is the battery according to claim 1 or 2, wherein the end of the second conductive rigid body 5 on the container bottom side is brought into contact with the bottom portion of the bottomed tubular member 1. It is a thing.
[0006]
In the section of means for solving the above problems, the drawings of the embodiments of the invention are used for easy understanding of the present invention. However, the present invention is not limited to the embodiments of the invention. Absent.
[0007]
【The invention's effect】
According to the first aspect of the present invention, the lower current collector connected to the electrode winding body is fixed to the lid via the second conductive rigid body. As a result, the electrode winding body is fixed to the battery container, and movement of the electrode winding body in the battery container can be prevented. Moreover, the part which protruded out of the battery container of the 1st and 2nd electroconductive rigid body can be shared as an electrode terminal.
In the invention of claim 2, in addition to the effect of the invention of claim 1, the tube material that is the axial core of the electrode winding body is fixed to the lid of the battery container via the upper current collector, so the electrode winding body Is more firmly fixed to the battery container.
According to the invention of claim 3, in addition to the effects of the inventions of claims 1 and 2, the end of the second conductive rigid body on the container bottom side is the bottom part of the low-cylindrical member constituting the battery container. Therefore, the effect of preventing movement of the electrode winding body can be further improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 are views showing an embodiment of a battery according to the present invention. FIG. 1 is a longitudinal sectional view of the battery 100, and FIG. 2 is a transverse sectional view of the battery 100 shown in FIG. 2, (a) is an AA sectional view, (b) is a BB sectional view, (c) is a CC sectional view, and (d) is a DD sectional view. The cell case 1 and the cover plate 7 constitute a battery container of the battery 100, and an electrode winding body (electrode laminate) 2 that is a power generation element is accommodated in the cell case 1. The cell case 1 is made of a bottomed cylindrical conductive member such as a metal can, and the outer peripheral surface of the cell case 1 is covered with an insulating material (not shown) such as PE (polyethylene) or PET (polyethylene terephthalate). . A shaft core tube 3 made of an insulating material is provided at the center of the electrode winding body 2, and the electrode winding body 2 winds a sheet-like positive electrode and a negative electrode on the shaft core tube 3 in a roll shape as will be described later. It is a thing.
[0009]
FIG. 3 is a diagram showing a detailed structure of the electrode winding body 2, and a part thereof is a broken surface so that the structure can be easily understood. 201 is a positive electrode, 202 is a negative electrode, and 203 is a separator. These are overlapped as shown in FIG. 3 and wound around the shaft core tube 3 to form the cylindrical electrode winding body 2. As a result, the roll-shaped electrodes 201 and 202 and the separator 203 are supported by the axial core tube 3. Note that, at the start of winding on the shaft core tube 3, the winding start tip portion of the separator 203 is fixed to the shaft core tube 3 by welding or the like. The shaft core tube 3 is made of an insulating material such as PP (polyplopylene).
[0010]
The positive electrode 201 is obtained by applying an active material such as lithium manganate or lithium cobaltate to an aluminum foil having a thickness of about 20 μm, and the hatched portion 201a is a positive electrode active material application portion. On the other hand, the negative electrode 202 is obtained by applying an active material such as hard carbon or graphite to a copper foil having a thickness of about 10 μm, and the hatched portion 202a is a negative electrode active material application portion. The separator 203 is obtained by extending a polymer material such as PP or PE into a film having a thickness of about 40 μm, and is finished in a microporous shape having a large number of minute holes. Current collecting tabs 201b and 202b are respectively formed on the positive electrode 201 and the negative electrode 202. The current collecting tab 202b of the negative electrode 202 protrudes from the left end of the electrode winding body 2 in the drawing, and the current collecting tab 201b of the positive electrode 201 is an electrode. Projecting at the right end of the wound body 2. The current collecting tabs 201b and 202b are formed so as to be uniformly distributed from the beginning of the electrodes 201 and 202 to the end of the electrodes, and the number thereof is about 100 each.
[0011]
Returning to FIG. 1, the positive electrode current collection ring 4a and the negative electrode current collection ring 4b are arrange | positioned at the upper and lower ends of the electrode winding body 2, respectively. As the material of the current collecting rings 4a and 4b, copper or the like, which is a highly conductive metal, is used. 4A and 4B are diagrams showing the shape of the negative electrode current collecting ring 4b, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view. As shown in FIG. 4A, a hole 401 having a large diameter is formed at the center of the negative electrode current collecting ring 4b, and six holes 402 having a small diameter are formed around the hole 401. . Further, the peripheral edge 403 of the negative electrode current collecting ring 4b has a cylindrical shape that is bent in the axial direction.
[0012]
A rod-shaped conductor 5 is inserted into the shaft core tube 3 in FIG. 1, and the lower end of the conductor 5 is fixed to the hole 401 (see FIG. 2D) of the negative electrode current collecting ring 4b by press-fitting or welding. Has been. A member having sufficient rigidity to support the electrode winding body 2 is used for the conductor 5, and for example, a highly conductive material such as copper is used. A current collecting tab 202b protruding downward from the electrode winding body 2 is connected to the outer peripheral portion of the negative electrode current collecting ring 4b by being soldered or soldered. As shown in FIG. 3, the current collecting tab 202b is uniformly formed from the beginning portion of the negative electrode 202 to the end portion of the negative electrode 202, and these are all connected to the negative electrode current collecting ring 4b for current collection. Good current collection efficiency. Note that the illustration of the hole 402 is omitted in FIG.
[0013]
On the other hand, the positive electrode current collection ring 4a is provided in the side which the current collection tab 201b of the electrode winding body 2 protrudes. As shown in FIG. 2B, a hole 404 is formed at the center of the positive electrode current collecting ring 4a, and the upper end portion of the shaft core tube 3 is fixed to the hole 404 by press-fitting or bonding. The current collection tab 201b is connected to the periphery of the positive electrode current collection ring 4a by being soldered or soldered (see FIG. 1), similarly to the current collection tab 202b described above. Moreover, the lower end part of the positive electrode terminal 6 is being fixed to the positive electrode current collection ring 4a in the position off from the center, as shown in FIG.1 and FIG.2.
[0014]
As shown in FIG. 1, the upper end portion of the conductor 5 that is a negative electrode terminal and the upper end portion of the positive electrode terminal 6 penetrate the cover plate 7 and protrude outside the casing. Insulating bushes 9 such as resin and ceramic are provided between the conductor 5 and the lid plate 7 and between the positive electrode terminal 6 and the lid plate 7 to prevent a short circuit between the positive electrode and the negative electrode. The insulating bush 9 also functions as an airtight seal between the conductor 5 and the lid plate 7 and between the positive terminal 6 and the lid plate 7. An airtight packing 8 such as an O-ring is provided on the outer peripheral portion of the lid plate 7, and the airtight packing 8 seals the gap between the outer peripheral surface of the lid plate 7 and the inner peripheral surface of the cell case 1.
[0015]
Since the conductor 5 passes through the shaft core tube 3 which is an insulating material, the conductor 5 and the positive electrode current collecting ring 4a are insulated by the shaft core tube 3 as shown in FIG. Further, as shown in the CC cross-sectional view of FIG. 2C, the electrode winding body 2 does not contact the conductor 5 directly.
[0016]
When the battery 100 is assembled, the electrode winding body 2 is fixed to the lid plate 7 via the conductor 5 and the positive terminal 6 as shown in FIG. Thereafter, the cell case 1 is filled with a predetermined amount of electrolytic solution, and the cover plate 7 is attached to the opening of the cell case 1 so that the wound body 2 is accommodated in the cell case 1. An anti-vibration material 10 such as EPDM is disposed at the bottom of the cell case 1 so that a gap between the lower end of the negative electrode current collector ring 4b and the conductor 5 and the bottom of the cell case 1 does not occur. The vibration isolator 10 is deformed as shown in FIG. 1 by the pressing force when the cover plate 7 is attached to the cell casing 1.
[0017]
FIG. 6 is a view showing an assembly example of a module battery using the battery 100 shown in FIG. 1, and is a plan view showing a part of the module battery. A module battery is a battery in which a plurality of batteries 100 called unit batteries are connected in series as shown in FIG. 6, and 20 is an outer wall of a module case in which a battery C constituting the module is accommodated. Different terminals of adjacent batteries 100 are connected by a bus bar 21. That is, the positive electrode terminal 6 is connected to the negative electrode terminal (conductor 5) of the battery 100 adjacent to one side, and the negative electrode terminal 5 is connected to the positive electrode terminal 6 of the battery 100 adjacent to the other side.
[0018]
In the battery 100 shown in FIG. 1, since the current collecting tab 202b of the electrode winding body 2 is connected to the negative electrode current collecting ring 4b fixed to the lower end portion of the conductor 5, the electrode winding body 2 is connected to the negative electrode current collecting ring. It is fixed to the lid plate 7 via the electric ring 4b and the conductor 5. On the other hand, the current collecting tab 201 b of the positive electrode 201 is connected to the positive electrode current collecting ring 4 a fixed to the upper end portion of the shaft core tube 3, and the positive electrode current collecting ring 4 a is fixed to the positive electrode terminal 6 provided on the cover plate 7. Has been.
[0019]
As described above, in the battery 100 of the present embodiment, the electrode winding body 2 is fixed to the cover plate 7 via both the conductor 5 and the positive electrode terminal 6, so that vibration or the like is applied to the battery 100. There is no possibility that the electrode winding body 2 moves in the cell case 1. Furthermore, since the negative electrode current collection ring 4b and the conductor 5 are in contact with the bottom of the cell case 1 via the vibration isolator 10, the effect of preventing the movement of the electrode winding body 2 can be further improved. In addition, since one end of the conductor 5 protrudes from the lid plate 7 and also serves as a negative electrode terminal, the number of parts and the cost can be reduced.
[0020]
In the battery 100, since the negative electrode terminal 5 and the positive electrode terminal 6 are provided only on one side (lid side) of the columnar battery, the distance d between the battery bottom and the module outer wall 20 can be reduced. .
[0021]
In the correspondence between the embodiment described above and the elements of the claims, the positive electrode 201 and the negative electrode 202 are sheet-like electrode members, the axial core tube 3 is a tube material, the cell case 1 is a bottomed tubular member, and the lid The plate 7 is a lid, the cell case 1 and the lid plate 7 are battery containers, the positive current collector ring 4a is a positive current collector and an upper current collector, and the negative current collector ring 4b is a negative current collector and a lower current collector. The positive electrode terminal 6 constitutes the rigid body and the first conductive rigid body of claim 1, the conductor 5 constitutes the second conductive rigid body, and the insulating bush 9 constitutes the insulating member.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of a battery according to the present invention, and is a longitudinal sectional view showing an internal structure of a battery.
2A and 2B are cross-sectional views of the battery 100 shown in FIG. 1, wherein FIG. 2A is a cross-sectional view taken along the line AA, FIG. 2B is a cross-sectional view taken along the line BB, and FIG. ) Is a DD cross-sectional view.
3 is a view showing a detailed structure of an electrode winding body 2. FIG.
4A and 4B are diagrams showing the shape of a negative electrode current collecting ring 4b, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
FIG. 5 is a diagram for explaining an assembly procedure of the battery.
FIG. 6 is a view showing an assembly example of a module battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cell case 2 Electrode winding body 3 Axial core tube 4a Positive electrode current collection ring 4b Negative electrode current collection ring 5 Conductor 6 Positive electrode terminal 7 Cover plate 8 Airtight packing 9 Insulation bush 10 Vibration isolator 100 Battery 201 Positive electrode 201a, 202b Current collection Tab 202 Negative electrode 203 Separator

Claims (3)

An electrode winding body formed by sandwiching positive and negative sheet-like electrode materials stacked on both sides of a separator on an axial core is composed of a bottomed cylindrical member and a lid for closing the opening of the bottomed cylindrical member. In the battery stored in the battery container,
Using a hollow tube for the shaft core,
An upper current collector disposed between the electrode winding body and the lid and connected to any one of the electrode materials;
A lower current collector disposed between the electrode winding body and the bottom of the bottomed tubular member and connected to the other of the electrode members;
A first conductive rigid body fixed to the upper current collector and penetrating the lid and projecting outside the battery container;
The tube material is disposed in contact with the tube material in the hollow so as to extend in the axial direction of the tube material , one end is fixed to the lower current collector, and the other end penetrates the lid to the outside of the battery container. A battery comprising: a second conductive rigid body fixed to the lid so as to protrude. The battery according to claim 1.
The battery, wherein the upper current collector is fixed to the tube material, and the first conductive rigid body is fixed to the lid via an insulating member. The battery according to claim 1 or 2,
A battery characterized in that an end of the second conductive rigid body on the container bottom side is brought into contact with a bottom portion of the bottomed cylindrical member.

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