JP2005216825A - Square battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a square battery wherein a current carrying path from each part of the coated portion of an electrode plate to a collector can be shortened and connection resistance can be lessened to obtain a high output, and which can be structured so as to have high volume density and a compact size while having high productivity so that its cost can be reduced. <P>SOLUTION: This square battery 1 contains a group of electrodes 4, in which a beltlike positive electrode plate is superposed over a beltlike negative electrode plate through a separator and they are wound, and from which the non-coated portions 6 of the positive electrode plate and the negative electrode plate are protruded at both end parts in the direction of their winding axis, and an electrolyte in a square battery case 1A. A fitting end part 8a having a V-shaped cross-section and a collector 8 having a pair of bonding plate parts 8b continuously connected to it are fitted in the winding center part of the non-coated portions 6 wound in a multiple ellipse shape, and both bonding plate parts 8b are bonded to the group of the non-coated portions 6 in its outside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a prismatic battery having a cross-sectional shape of a rectangle, a rounded rectangle, or an oval, and a method of manufacturing the same.

  Conventionally, as a battery that can obtain a higher volume density than a cylindrical battery, an electrode plate group formed by winding a strip-like positive electrode plate and a negative electrode plate with a separator interposed in a rectangular battery case and electrolysis A square battery containing a liquid is known. Further, in this type of prismatic battery, the non-coated portions of the positive electrode plate and the negative electrode plate are protruded from both ends in the winding axis direction of the electrode plate group, respectively, and the protruded non-coated portions are electrode terminals or current collectors. By connecting to the body, it is possible to obtain a high output in a compact configuration by shortening the current path from each part of the coated part of the electrode plate to the electrode terminal or current collector and reducing the connection resistance. Various ideas have been proposed.

  For example, the shaft portion of the electrode terminal is disposed on the non-coated portion that protrudes from the electrode plate group, and a plurality of protrusions that protrude from both side edges of the shaft portion are heated and melted, and the melt is laminated. There is known one in which a non-coated portion and a shaft portion of an electrode terminal are joined at a bridging portion formed by supplying to the interface of the working portion (see, for example, Patent Document 1).

  In addition, the uncoated portions of the stacked electrode plates protruding from the electrode plate group are converged for each required number, and the current collector to which the electrode terminals are connected and fixed has a reverse V-shaped cross section and a slit at the apex. It is known that the required number of stenosis portions are continuously formed, the converged non-coating portions are inserted into each stenosis portion, the tip of the non-coating portion is protruded from the slit, and laser welding is performed (for example, , See Patent Document 2).

  Further, the uncoated portions of the laminated electrode plates protruding from the electrode plate group are converged for each required number, and the current collector is connected and fixed to the current collector. Form the required number of U-shaped grooves continuously, insert the non-coated part converged in each groove part, weld the groove part of the current collector and the inserted part of the non-coated part by ultrasonic welding or resistance welding, Or what was mechanically couple | bonded with the rivet etc. is known (for example, refer patent document 3).

  Further, the non-coated portion of the laminated electrode plate protruding from the electrode plate group is divided into a plurality of pieces using a jig having a plurality of angle teeth, and the non-coated portion is connected to the current collector to which the electrode terminals are connected and fixed. A current collector is provided on the coating part, and a plurality of clamping parts connected to the current collecting part via a flat plate part are provided, and a non-coating part distributed to each clamping part is inserted. And what clamped the clamping part and was connected and fixed by ultrasonic welding is also known (for example, refer patent document 4).

In addition, the technique of joining by the friction stir welding (FSW: Friction Stir Welding) method in the state which sandwiched the laminated body of the aluminum foil between the aluminum plates is also known (for example, refer nonpatent literature 1).
JP 2002-100340 A JP-A-10-261441 JP-A-10-270048 JP 2000-82486 A Aoya Shinya, “Application of Friction Stir Welding to Microjoining”, Journal of the Japan Welding Society, Japan Welding Society, April 2003, Vol. 72, No. 3, P25-28

  However, as disclosed in Patent Document 1 and Patent Document 2, in the method of joining the non-coated portion and the current collector of the electrode plate protruding from the electrode plate group by heating and melting a part thereof, There is a possibility that the separator interposed between the electrode plates may be affected by heat, impede its function, and possibly cause a short circuit. In order to prevent this, it is necessary to take measures such as increasing the amount of protrusion of the non-coated part from the electrode plate group, cooling, etc., reducing the volume efficiency of the battery, and complicating the joining process. There is a problem in that the cost of the equipment increases and the cost of the equipment increases, resulting in a decrease in productivity and an increase in cost.

  Moreover, as disclosed in Patent Document 2 and Patent Document 3, the non-coated portion is converged for each required number, and the non-coated portion is inserted into an inverted V-shaped narrowed portion or groove portion, and ultrasonic welding or the like. In the structure to be joined with, it requires a complicated man-hour for converging the non-coated parts for each required number, resulting in low productivity and high cost, and V-shaped between the narrowed part and the groove part. This protrusion is inserted between the non-coated parts where the protrusion converges, so there is a risk that the tip of this protrusion will come into contact with the reverse polarity electrode plate, causing a short circuit and preventing it. In order to do this, it is necessary to increase the amount of protrusion of the non-coated portion, and there is a problem that volume efficiency is deteriorated.

  In addition, in the structure disclosed in Patent Document 4, the problem due to the V-shaped protrusion is solved to some extent by providing a flat portion between the sandwiching portions. However, a jig having a plurality of chevron teeth is used. There is a problem that the process of using and distributing the non-coated part into a plurality of steps is required, resulting in low productivity and high cost.

  In view of the above-mentioned conventional problems, the present invention can shorten the energization path from each part of the coated portion of the electrode plate to the current collector, reduce the connection resistance, obtain a high output, and have a high volume density and a compact size. It is an object of the present invention to provide a prismatic battery that can be configured as described above, that is highly productive, and that can reduce costs, and a method for manufacturing the prismatic battery.

  The prismatic battery of the present invention is formed by winding a strip-shaped positive electrode plate and a negative electrode plate with a separator interposed therebetween in a rectangular battery casing, and the positive electrode plate and the negative electrode plate are not coated on both ends in the winding axis direction, respectively. A prismatic battery comprising an electrode plate group from which a work part is projected and an electrolyte solution, wherein at least one end portion of the both end portions is a fitting end portion having a substantially V-shaped cross section and a pair continuous thereto. A current collector having a joining plate part is inserted into the winding center part of the non-coated part wound in a multi-oval shape, and both the joining plate parts and the non-coated part outside thereof are joined. It is. For joining, ultrasonic joining, resistance welding, friction stir welding (FSW), or the like, which has little thermal influence, is suitable.

  According to this configuration, since a large gap is formed in the winding center portion of the non-coated portion wound in the multiple oval shape as compared with the multiple laminated portion of the non-coated portion, the current collector Since the insertion end portion having a substantially V-shaped cross section can be easily inserted and welding work can be performed from the outside, it is possible to connect with high work efficiency, high productivity, and cost reduction. Can do. In addition, on one end side of the electrode plate group, since the insertion end portion is inserted between the non-coated portions of the innermost electrode plate having the same polarity as that of the current collector, the electrode plate group On the other side of the separator, there is a separator surrounding the edge of the innermost electrode plate with the opposite polarity to the polarity to which the current collector is connected, and the same polarity as the polarity to which the current collector is connected. Since the non-coated part of the electrode plate is surrounded, the separator is folded inward and overlapped on the edge of the opposite polarity electrode plate group so as to cover the non-coated part of the electrode plate of the same polarity. By inserting the insertion end into the gap, the insertion end at the tip of the current collector does not cause a short circuit with the opposite polarity electrode plate even if the projection length of the non-coated part is short, and the volume density is high. It can be configured compactly. In addition, since the non-coating portion wound in a multi-oval shape is joined to the current collector at two locations in the circumferential direction, the energization path from each part of the coating portion of the electrode plate to the current collector is shortened. In addition, the connection resistance can be reduced and high output can be obtained.

  Moreover, since the innermost circumference is a separator when the electrode plate group is formed by winding only the separator one or more times at the beginning of winding, a current collector is provided between the separators at both ends of the electrode plate group. Therefore, the risk of causing a short circuit between the inserted end of the current collector and the electrode plate having the opposite polarity can be eliminated more easily and reliably.

  In addition, when bonding is performed with the non-coated portion sandwiched between both the bonded plate portions and the contact plate, the contact portion of the bonding tool in the non-coated portion is locally broken or melted during bonding. Therefore, a highly reliable joining state can be ensured.

  In addition, if both the joining plate portions and the contact plate are integrally connected via a connecting piece, and the shape of the current collector in the cross-sectional direction is substantially M-shaped, the current collector and the contact plate can be handled as an integral part. In addition to improving the component cost and production efficiency, since the connection is made only with the connecting pieces, the rigidity of the connecting portion of the joining plate portion and the backing plate is small, and the non-coated portion can be easily sandwiched between them. In addition, there is no possibility of causing problems such as inhibiting the vibration of the contact plate at the time of ultrasonic bonding, or causing a short circuit current to become large and impossible to weld at the time of resistance welding.

  In addition, the method for manufacturing a prismatic battery according to the present invention includes a strip-shaped positive electrode plate and a negative electrode plate stacked in a rectangular battery casing with a separator interposed therebetween, and each of the positive electrode plate and the positive electrode plate at both ends in the winding axis direction. A method for manufacturing a prismatic battery comprising an electrode plate group in which a non-coated portion of a negative electrode plate protrudes and an electrolyte solution, wherein the electrode plate group is wound in multiple oval shapes at both ends of the wound electrode plate group. A step of fitting a current collector having a fitting end portion having a substantially V-shaped cross section and a pair of joining plate portions continuous thereto into the winding center portion of the non-coated portion; There are a step of joining the non-coated portion, and a step of connecting the bipolar current collectors to the external connection terminals, respectively, and housing the electrode plate group in the battery casing.

  According to this configuration, a high-power rectangular battery having a high volume density and a compact configuration as described above, a short energization path from each part of the coating portion of the electrode plate to the current collector, and a low connection resistance. It can be easily manufactured with good productivity.

  In addition, when the non-coated part is sandwiched between the joining plate part and the backing plate, the joining plate part is received by the anvil, and when the ultrasonic horn is applied to the backing plate and ultrasonic joining is performed, each uncoated part is torn. Bonding can be performed by ultrasonic bonding without occurrence, and a highly reliable bonding state with high productivity can be obtained.

  In addition, when resistance welding is performed by applying an electrode to the joining plate portion and the contact plate in a state where the uncoated portion is sandwiched between the joining plate portion and the contact plate, each uncoated portion is broken or locally melted. Therefore, a highly reliable welded joint state can be obtained with high productivity.

  In addition, when the non-coated part is sandwiched between the joining plate part and the contact plate and joined by the friction stir welding method, it is not affected by heat and there is no risk of the active material of the electrode plate falling off due to vibration or the like. The current collector plate with a thickness of 5 mm and non-coated parts can be joined with high reliability, and the current collector and leads can be integrated, reducing the number of parts and the number of connections, reducing internal resistance and cost Can be significantly reduced.

  According to the prismatic battery of the present invention and the manufacturing method thereof, the current collector can be easily inserted into the winding center of the non-coated portion and joined from the outside to be connected with high work efficiency, thereby improving productivity. The cost can be reduced, and even if the protruding length of the non-coated part is short, the insertion end of the current collector does not cause a short circuit with the electrode plate with the opposite polarity. In addition, the energization path from each part of the coating portion of the electrode plate to the current collector can be short, the connection resistance can be reduced, and high output can be obtained.

  Hereinafter, an embodiment of a prismatic battery and a manufacturing method thereof according to the present invention will be described with reference to FIGS.

  1 to 4, reference numeral 1 denotes a prismatic battery made of a lithium ion battery. A sealing plate 3 is provided at one end opening of a case 2 having a flat rectangular shape or a rounded rectangular or oval bottomed rectangular tube shape. Is sealed and welded to form a battery housing 1A, and an electrode plate group 4 as a power generation element is housed in the battery housing 1A together with an electrolyte. In the present embodiment, the case 2 and the sealing plate 3 are made of steel plates.

  The electrode plate group 4 is wound around the outer periphery of a thin plate-shaped core material in a state in which a belt-like positive electrode plate, a separator, a negative electrode plate, and a separator are sequentially stacked, and after completion of the winding, the core material is pulled out and compressed into a flat shape. As shown in FIG. 6, the positive electrode plate 4a and the negative electrode plate 4b are laminated with a separator c interposed therebetween. In particular, in the present embodiment, after winding only the separator 4c one or more times at the beginning of winding, the negative electrode plate 4b, the separator 4c, the positive electrode plate a, and the separator 4c are wound one on top of the other in order. Multiple layers of separators 4c are provided. Further, the outermost periphery of the electrode plate group 4 is also wound with one or more layers of separators 4c to prevent a short circuit if necessary.

  The positive electrode plate 4a is configured by applying and drying a positive electrode mixture on a core material made of aluminum foil, and on one side of the positive electrode plate 4a, a non-coated portion of the positive electrode consisting only of a core material not coated with the positive electrode mixture 5 is formed. The negative electrode plate 4b is formed by applying and drying a negative electrode mixture on a core material made of copper foil, and the other side is not coated with a negative electrode consisting only of a core material to which no negative electrode mixture is applied. Part 6 is formed. The separator 4c is made of a microporous polypropylene film or the like. In the electrode plate group 4, the non-coated portion 5 of the positive electrode and the non-coated portion 6 of the negative electrode protrude on the opposite sides.

  A positive electrode current collector 7 made of an aluminum plate is joined to a positive electrode non-coating portion 5 protruding to the upper end side of the electrode plate group 4. Specifically, as shown in detail in FIG. 2, an insertion end portion having a substantially V-shaped cross section at the winding center portion of the non-coated portion 5 wound in a multiple oval shape at the upper end portion of the electrode plate group 3. 7a and a current collector 7 having a pair of joint plate portions 7b that are continuously opened in a V shape are fitted, and the laminated group of the non-coated portions 5 is pressed against the outer surface of both joint plate portions 7b. The contact plate 9 is disposed outside thereof, and is joined by ultrasonic welding, resistance welding, FSW method, or the like in a state where the laminated group of the non-coated portions 5 is sandwiched between the joining plate portion 7 b and the contact plate 9.

  Further, a negative electrode non-coating portion 6 protruding to the lower end side of the electrode plate group 3 is joined to a copper plate or a negative electrode current collector 8 having a nickel plating on the surface thereof. Specifically, as shown in detail in FIG. 3, an insertion end portion having a substantially V-shaped cross section at the winding center portion of the non-coated portion 6 wound in a multiple oval shape at the lower end portion of the electrode plate group 3. 8a and a current collector 8 having a pair of joining plate portions 8b formed so as to be continuously raised in parallel therewith, and the laminated group of the non-coated portions 6 is pressed against the outer surfaces of both the joining plate portions 8b. Further, the backing plate 10 is arranged outside thereof, and is joined by ultrasonic welding, resistance welding, FSW method or the like with the laminated group of the non-coated portions 6 sandwiched between the joining plate portion 8b and the backing plate 10. .

  As shown in FIGS. 2 and 4, the positive electrode current collector 7 is formed with a connection piece 7 c raised from one end of one joining plate portion 7 b, and this connection piece 7 c is formed on the inner surface of the sealing plate 3. 12 is joined to a connecting piece 13a suspended from one end of a lead plate 13 disposed via 12 by spot welding. The sealing plate 3 is formed with a terminal through hole 15 that allows the positive external connection terminal 11 to pass through. The external connection terminal 11 is formed between the inner periphery of the insulating member 12 and the terminal through hole 15 and the upper surface of the sealing plate 3. It is mounted and fixed in an insulated state via an insulating member 14 interposed therebetween. The external connection terminal 11 is configured by accommodating and arranging a safety valve mechanism 11c and a cap 11d in the filter 11a via an inner gasket 11b, and caulking the lower end of the filter 11a together with the sealing plate 3 and the lead plate 13. It is fixed.

  As shown in FIGS. 3 and 4, the negative electrode current collector 8 is bent from one end portion of one joining plate portion 8 b toward the other joining plate portion 8 b and extends long outward toward one end. A connection piece 8 c is formed so as to protrude, and this connection piece 8 c is connected to the lead plate 16. The lead plate 16 is composed of a conductive plate material having a large cross-sectional area in order to reduce current resistance, and is disposed along the inner surface of the short wall on one side of the case 2 as shown in FIGS. The connecting portions 16a and 16b are bent in an L shape from the upper and lower ends, the upper connecting portion 16a is joined to the sealing plate 3 by spot welding or the like, and the lower connecting portion 16b is spot welded to the connecting piece 8c. Etc. are joined. Thus, the negative external connection terminal is constituted by the sealing plate 3 or a terminal member fixed thereto.

  Further, when the negative electrode current collector 8 is ultrasonically bonded to the negative electrode non-coated portion 6, as shown in FIG. 5, an anvil 21 is inserted and supported between the bonding plate portions 8b and 8b. Ultrasonic bonding can be performed by pressing the ultrasonic horn 22 against the outer surface side of the plate 10 and applying ultrasonic vibration energy. Moreover, when joining by resistance welding, it can replace by using the welding electrode instead of the anvil 21 and the ultrasonic horn 22, and can be welded by sending a welding current. Further, when joining by the FSW method, while the joining plate portions 8b and 8b are supported by the anvil 21, a tool having a large diameter shoulder and a small diameter pin is rotated at high speed from the outside of the backing plate 10. An arbitrary-length joint can be formed by scanning while pressing and friction stirring. This FSW method has little thermal effect on the separator, etc., does not generate spatter, fume, dust, etc. due to resistance welding, etc., and there is no fear of peeling of the active material due to vibration as in the case of ultrasonic bonding. Even a thick current collector can be appropriately joined, which is advantageous in that it can be integrated with the lead plate 16 to reduce the number of parts. In the example of FIG. 5, the example of joining of the negative electrode current collector 8 and the negative electrode non-coated portion 6 is illustrated and described. However, the positive electrode current collector 6 and the positive electrode non-coated portion 5 Of course, it can also be applied to bonding.

  Next, an example of the manufacturing process of the prismatic battery 1 having the above configuration will be described with reference to FIG. After producing the electrode plate group 4 by stacking and winding the belt-like positive electrode plate and the negative electrode plate with a separator interposed between them, the winding center portions of the non-coated parts 5 and 6 projected from both ends of the electrode plate group 4 are Current collectors 7 and 8 having fitting end portions 7a and 8a having a substantially V-shaped cross section and a pair of joining plate portions 7b and 8b continuous thereto are fitted, respectively, and a contact plate 9 is placed on the outer surface of the non-coated portions 5 and 6. 10 are applied, and the current collectors 7 and 8 and the non-coated portions 5 and 6 are joined by ultrasonic joining, resistance welding, FSW method, or the like.

  Further, the external connection terminal 11 and the lead plate 13 are attached and fixed to the sealing plate 3, and the connection portion 16 b at the lower end of the lead plate 16 is welded to the connection piece 8 c of the negative electrode current collector 8. Next, the connecting piece 7 c of the positive electrode current collector 7 is welded to the connecting piece 13 a of the lead plate 13, and the connecting portion 16 a at the upper end of the lead plate 16 is welded to the sealing plate 3. Thereafter, the electrode plate group 4 and the sealing plate 3 integrated with each other are inserted into the case 2, and the edge of the rising portion 3 a formed on the outer periphery of the sealing plate 3 and the opening edge of the case 2 are Are welded in a sealed manner at the formed weld 23. Thereafter, the electrolytic solution is injected from the injection port 24 formed in the sealing plate 3 and sealed with the sealing plug 25, thereby completing the rectangular battery 1.

  According to the present embodiment described above, the winding center portions of the non-coated portions 5 and 6 that are wound in a multi-oval shape at both ends of the electrode plate group 4 and project are provided at the winding center portions of the non-coated portions 5 and 6. Since a large gap is formed as compared to the multi-layered portion, the fitting end portions 7a and 8a having a substantially V-shaped cross section of the current collectors 7 and 8 can be easily fitted, and then the current collector from the outside. Since the non-coated portions 5 and 6 can be joined to 7 and 8, they can be joined with high work efficiency. Therefore, productivity is high and cost reduction can be achieved.

  In addition, since the non-coating portions 5 and 6 are sandwiched between the joining plate portions 7b and 8b of the current collectors 7 and 8 and the contact plates 9 and 10 during the joining, The contact part of welding tools, such as the ultrasonic horn 22 and an electrode in the coating parts 5 and 6, does not fracture | rupture locally or melt | dissolve, but can ensure a reliable joining state.

  In addition, since the non-coated portions 5 and 6 wound in a multi-oval shape are connected to the current collectors 7 and 8 by welding at two locations in the circumferential direction, from each portion of the coated portion of the electrode plate The energization path leading to the current collectors 7 and 8 can be shortened, the connection resistance can be reduced, and a high output can be obtained.

  Further, according to the present embodiment, since only the separator 4c is wound one or more times at the beginning of winding of the electrode plate group 4, as shown in FIG. 6, the innermost periphery of the electrode plate group 4 is a separator. Therefore, the insertion end portion 8a of the current collector 8 is inserted between the separators 4c and 4c, and the insertion end portion 8a of the current collector 8 is more likely to cause a short circuit with the positive electrode plate 4a having the reverse polarity. It can be easily and reliably eliminated. Although not shown, the same applies to the positive electrode current collector 7 and the positive electrode non-coated portion 5, but in the case of the positive electrode current collector 7, the reverse of the innermost electrode plate. This is particularly effective because the possibility of causing a short circuit with the polar negative electrode plate 4b can be reliably eliminated.

  Even when the innermost periphery of the electrode plate group 4 is not the separator 4c, the innermost periphery is usually the negative electrode plate 4b in the electrode plate group 4, so that the insertion end 8a of the negative electrode current collector 8 is Since it is inserted between the non-coated portions 6 of the innermost negative electrode plate 4b, the insertion end portion 8a at the tip of the current collector 8 has a reverse polarity even if the protruding length of the non-coated portion 6 is short. There is no risk of short circuit with the positive electrode plate 4a. On the current collector 7 side of the positive electrode, a separator 4c exists so as to surround the periphery of the innermost negative electrode plate 4b having a polarity opposite to the polarity of the current collector 7, and the periphery of the separator 4c surrounds the positive electrode plate 4a. Since the separator 4c is folded inward and overlaid on the edge of the negative electrode plate 4b, the insertion end portion 7a of the current collector 7 is covered with the non-coated portion of the positive electrode plate 4a. By fitting in the gaps between the working parts 5, it is possible to eliminate the possibility that the fitting end part 7a at the tip of the current collector 7 will cause a short circuit with the negative electrode plate 4b even if the protruding length of the non-coated part 5 is short. . Thus, the volume density can be increased and the configuration can be made compact.

  In the current collectors 7 and 8 of the above embodiment, the contact plates 9 and 10 which are separate members are used. However, as shown in FIG. 7, the current collectors 7 and 8 have a V-shaped fitting end portion 18 a and both joint plate portions 18 b. It is also possible to use a current collector 17 in which the ends of the current collector 18 and the contact plate 19 are integrally connected via one or a plurality of connecting pieces 20 so that the cross-sectional shape is substantially M-shaped. When such a current collector 17 is used, the current collector 18 and the contact plate 19 can be handled as an integral part, so that the parts cost and production efficiency can be improved, and since the connection is made only by the connection piece 20, the connection is achieved. The connecting portion between the plate portion 18b and the contact plate 19 has a small rigidity, and the non-coated portion 6 or the non-coated portion 5 can be easily sandwiched between them. There is no possibility of causing a problem that the short circuit current is large at the time of resistance welding and welding becomes impossible.

  The prismatic battery of the present invention can be connected with high work efficiency by easily fitting the current collector into the winding center of the non-coated part and joining from the outside, improving productivity and reducing cost, In addition, even if the protruding length of the non-coated part is short, there is no possibility that the insertion end at the tip of the current collector will cause a short circuit with the electrode plate having the opposite polarity, so that the volume density can be increased and the structure can be made compact. The energization path from each part of the working part to the current collector is also short, the connection resistance can be reduced, and high output can be obtained, which is useful for various rectangular batteries such as lithium ion batteries and nickel metal hydride batteries.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure of the square battery of one Embodiment of this invention is shown, (a) is a vertical front view, (b) is a vertical side view. It is an expanded detailed sectional view of the peripheral part of the current collector of the positive electrode in the prismatic battery of the same embodiment. FIG. 3 is an enlarged detailed cross-sectional view of a peripheral portion of a negative electrode current collector in the rectangular battery of the same embodiment. It is the general | schematic disassembled perspective view which abbreviate | omitted and showed the case of the square battery of the embodiment. It is explanatory drawing of the joining process of the electrical power collector in the same embodiment, and a non-coating part. It is an expanded sectional view showing the state where the insertion end of the current collector was inserted in the embodiment. It is explanatory drawing of the joining process of the electrical power collector and non-coating part in the square battery of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Square battery 1A Battery housing 4 Electrode plate group 4a Positive electrode plate 4b Negative electrode plate 4c Separator 5 Positive electrode non-coating part 6 Negative electrode non-coating part 7 Positive electrode collector 7a Insertion end part 7b Bonding plate part 8 Current collector 8a Insertion end portion 8b Joint plate portion 9 Contact plate 10 Contact plate 17 Current collector 18b Joint plate portion 19 Contact plate 20 Connecting piece 21 Anvil 22 Ultrasonic horn

Claims (8)

  In a rectangular battery casing, a belt-like positive electrode plate and a negative electrode plate are overlapped and wound with a separator interposed therebetween, and uncoated portions of the positive electrode plate and the negative electrode plate protrude from both ends in the winding axis direction, respectively. A prismatic battery containing an electrode plate group and an electrolyte solution, wherein at least one end portion of the both end portions has a fitting end portion having a substantially V-shaped cross section and a pair of joining plate portions continuous thereto. A prismatic battery characterized in that an electric body is fitted into a winding center portion of a non-coated portion wound in a multi-oval shape, and both the joining plate portions and the non-coated portion outside thereof are joined.   The prismatic battery according to claim 1, wherein the electrode plate group is formed by winding only the separator one or more times at the beginning of winding.   The prismatic battery according to claim 1 or 2, wherein the non-coating portion is sandwiched between both the joining plate portions and the contact plate.   4. The prismatic battery according to claim 3, wherein both the joining plate portion and the contact plate are integrally connected through a connecting piece, and the shape of the current collector in the cross-sectional direction is substantially M-shaped.   In a rectangular battery casing, a belt-like positive electrode plate and a negative electrode plate are overlapped and wound with a separator interposed therebetween, and uncoated portions of the positive electrode plate and the negative electrode plate protrude from both ends in the winding axis direction, respectively. A method of manufacturing a prismatic battery containing an electrode plate group and an electrolyte solution, wherein a winding center portion of a non-coated portion wound in a multiple oval shape is wound at both ends of the wound electrode plate group. , A step of inserting a current collector having a fitting end portion having a substantially V-shaped cross section and a pair of joining plate portions continuous thereto, a step of joining both the joining plate portions and the non-coating portion outside thereof, and bipolar And a step of housing the electrode plate group in a battery casing.   6. The prismatic battery according to claim 5, wherein the non-coated portion is sandwiched between the joining plate portion and the contact plate, the joining plate portion is received by an anvil, and an ultrasonic horn is applied to the contact plate for ultrasonic joining. Manufacturing method.   6. The method for manufacturing a prismatic battery according to claim 5, wherein the non-coated portion is sandwiched between the joining plate portion and the contact plate, and resistance welding is performed by applying an electrode to the joining plate portion and the contact plate. 6. The method for manufacturing a prismatic battery according to claim 5, wherein the non-coated portion is joined by a friction stir welding method in a state where the non-coated portion is sandwiched between the joining plate portion and the contact plate.

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