JP5123752B2 - Square sealed battery - Google Patents

Description

  The present invention relates to a prismatic sealed battery, and more particularly to a prismatic sealed battery that is preferably applied to a collective secondary battery in which a plurality of single cells are connected, and whose internal resistance can be reduced.

  A conventional collective secondary battery in which a plurality of unit cells are connected so as to obtain a required power capacity is obtained by connecting a plurality of individual rectangular parallelepiped unit cells to a wide long side of the battery case. They are arranged so as to face each other, and are connected together by arranging end plates outside the battery case of the unit cells at both ends and binding them with a restraining band, and in each unit cell, the upper end of the electrode plate The lead is drawn upward from the terminal and connected to a terminal mounted on the lid of the battery case, and the terminals are connected to each other by a connecting plate between the single cells.

  Therefore, since the connection path between the single cells is long and there are many connection points, the component resistance due to the component parts including the connection parts is large, and the resistance between the component resistance and the reaction resistance in the battery reaction due to the positive electrode plate, the negative electrode plate, and the electrolytic solution. The ratio reached 40 to 50%: 60 to 50%, and the heat generation of the battery increased due to the large internal resistance, which was a major obstacle to realizing high output and improving life characteristics. In addition, there is a problem in that the connection configuration between single cells is complicated and the number of parts is large, resulting in an increase in cost.

Therefore, the present applicant has previously proposed a rectangular sealed battery 1 in which a plurality of single cells 2 are incorporated, as shown in FIGS. 3 is a rectangular battery case, and the battery case 4 of the rectangular parallelepiped unit cell 2 having a narrow short side face and a wide long side face is commonly connected to each other by sharing the short side face as a partition wall 5. The upper surface opening of each battery case 4 is integrally closed by an integral lid body 6. A connection hole 7 is formed in the short side surface outside the battery case 4 at both ends and the upper part of the partition wall 5 between the battery cases 4 and 4. In each battery case 4, an electrode plate group 8 formed by laminating a rectangular positive electrode plate and a negative electrode plate via a separator is accommodated together with an electrolytic solution, and a single battery 2 is configured. The positive electrode plate and the negative electrode plate of the electrode plate group 8 are projected to the opposite side portions to form lead portions 9a and 9b of the positive electrode plate and the negative electrode plate, and are gathered at the side edges of the lead portions 9a and 9b, respectively. The electric plates 10a and 10b are connected by welding or the like.
A connection protrusion 11 that fits into the connection hole 7 protrudes from the upper part of the current collector plates 10 a and 10 b, and the connection protrusion 11 of the positive and negative current collector plates 10 a and 10 b between the adjacent battery cases 4 and 4. Are connected to each other by welding. Moreover, the positive or negative connection terminal 12 is mounted in the connection hole 7 on the short side surface outside the battery case 4 at both ends, and the connection protrusion 13 and the connection protrusion 11 of the current collector plate 10a or 10b are welded to each other. Connected. Thus, the plurality of single cells 2 built in the rectangular battery case 3 are connected in series and output between the connection terminals 12 and 12 at both ends.

  Further, the lid 6 has a communication passage 14 that equalizes the internal pressure of each battery case 4, 4 and a safety valve (not shown) for releasing the pressure when the internal pressure of each battery case 4 exceeds a certain level. ), A sensor mounting hole 15 for mounting a temperature sensor for detecting the temperature of an appropriate unit cell 2 and the like.

According to such a configuration, the energization path from the positive electrode plate and the negative electrode plate to the respective lead portions 9a and 9b in the electrode plate group 8 is short, and between the lead portions 9a and 9b via the current collecting plates 10a and 10 Since it is connected inside the rectangular battery case 2, compared with the conventional one in which individual cells are connected, the connection path is short and the number of connection points is small, so that the component resistance due to the component parts including the connection parts can be reduced. Therefore, the internal resistance can be reduced accordingly.
JP-A-8-153504

  However, in the configuration shown in FIGS. 12 and 13, the energization paths from the positive electrode plate and the negative electrode plate to the lead portions 9a and 9b and the current collector plates 10a and 10b are short, but as shown by arrows in FIG. In addition, since the current collector plates 10a and 10b are connected to each other at one point between the tips of the connection protrusions 11 at the upper end thereof, the connection path is detoured, so that the connection path becomes longer and 1 There is a problem that the internal resistance becomes high because the connection is made at a location, and the current collector plates 10a and 10b are used, resulting in a higher cost, and the current collector plates 10a and 10b are disposed on both sides. Since the upper portions of the current collector plates 10a and 10b need to protrude from the upper end of the electrode plate group 8, there is a problem that further solution is desired, such as an increase in the volume of the battery case 4.

  The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a rectangular sealed battery that can further reduce the internal resistance per unit cell and realize high output.

The rectangular sealed battery of the present invention includes a rectangular battery case in which a plurality of rectangular parallelepiped battery cases having a narrow short side surface and a wide long side surface are connected with a short side wall as a partition wall, a positive electrode plate, and a negative electrode plate Are stacked via a separator and one side of a positive electrode plate and one side of a negative electrode plate are protruded on opposite sides to form a lead part, and a current collector joined to lead parts on both sides of the electrode plate group. In the rectangular sealed battery containing the electrode plate group in which the current collector plate is joined to each battery case, a conductive connection plate facing the battery case on both sides of the partition wall is disposed on at least one side wall of the square battery case. A working opening for exposing the conductive connecting plate to the outside of the rectangular battery case is provided, the conductive connecting plate is connected to a current collector located on both sides of the partition wall at a plurality of positions in the working opening; and The work opening is hermetically closed by a closing plate and is separated through the work opening. It is possible to connect the current collector positioned on both sides of the easily a conductive connection plate. In addition, since one side or both sides of the current collector can be connected to the whole through the conductive connection plate, the energization path between the electrode plate groups can be shortened as a whole, and the internal resistance can be reduced. Moreover, since the upper part does not protrude above the electrode plate group for connecting the current collector plates, the battery case volume can be reduced by the space.

  According to the present invention, since one side or both sides of the current collector can be connected to the whole through the conductive connection plate, the energization path between the electrode plate groups is shortened as a whole, and the internal resistance is reduced. Moreover, since the upper part does not protrude above the electrode plate group for connecting the current collector plates, the battery case volume can be reduced by the space.

(First reference form)
Hereinafter, a first reference embodiment of the rectangular sealed battery of the present invention will be described with reference to FIG. The same constituent elements as those in the conventional example described with reference to FIGS. 12 and 13 are denoted by the same reference numerals, and different points will be mainly described.

In Figure 1, rectangular battery jar 3 in rectangular sealed battery 1 of the present reference embodiment, the partition wall 5 and the short side surface a plurality of the container 4 of a rectangular parallelepiped having a broad long sides of the narrow short side width width They are shared and integrally connected to each other, and a connection opening 19 is formed at the center of the partition wall 5.

  The electrode plate group 8 includes a plurality of positive plates and a plurality of negative plates arranged alternately, and each positive plate is covered with a bag-like separator having an opening in the horizontal direction, thereby forming a gap between the positive plate and the negative plate. A positive electrode plate and a negative electrode lead portion 9 are provided by laminating one side of the positive electrode plate and the negative electrode plate opposite to each other. The positive electrode plate is configured by filling nickel foam metal with nickel hydroxide except for the lead portion 9, and the lead portion 9 pressurizes and compresses the foam metal and seams the lead plate on one surface thereof by ultrasonic welding. It is constructed by welding. The negative electrode plate is formed by applying a paste containing a hydrogen storage alloy to Ni punching metal except for the lead portion 9.

  Current collectors 10 are joined to the lead portions 9 on both sides of the electrode plate group 8. In the central portion of the current collector 10, a connection protrusion 16 is formed so as to protrude into the connection opening 19 formed in the partition wall 5 and has a height approximately half the plate thickness of the partition wall 5. An adhesive 17 is applied, and a sealing material 18 such as a pitch is applied around the connection protrusion 16 in an annular shape.

  The electrode plate group 8 is inserted and disposed in each battery case 4 of the rectangular battery case 3, and the connection protrusion 16 of the current collector 10 is inserted into the connection opening 19 and inserted into the adjacent battery case 4. The electrode plate group 8 is connected to the connection protrusion 16 of the current collector 10 by the conductive adhesive 17. Moreover, the single cell 2 is each comprised by sealing between the partition walls 5 with the sealing material 18 of the circumference | surroundings, and each battery case 4 being interrupted | blocked.

  The rectangular sealed battery 1 includes a plurality of battery cases 4 connected to each other via a partition wall 5 and a rectangular battery case 3 having a connection opening 19 at the center of the partition wall 5, and positive and negative electrode plates on both sides. The electrode plate group 8 from which the lead portion 9 protrudes is formed, and the current collector 10 having the connection protrusion 16 is joined to the lead portion 9, and the end face of the connection protrusion 16 formed on the current collector 10 is joined A conductive adhesive 17 is applied and a sealing material 18 such as a pitch is applied around the periphery, and the electrode plate group 8 is inserted and disposed in each battery case 4 of the rectangular battery case 3 to collect current at the connection opening 19. The body 10 is connected to each other and the periphery thereof is sealed with a sealing material 18, and then the electrolytic solution is accommodated in the battery case 4 to close the opening of the battery case 4.

  According to the rectangular sealed battery 1 having the above configuration, the electrode plate groups 8 and 8 are connected to each other by the conductive adhesive 17 at the center portions of the current collectors 10 and 10. , 8 is shortened, the connection resistance between the single cells 2 and 2 is reduced, and the internal resistance per single cell 2 of the rectangular sealed battery 1 can be reduced. Further, since the upper portions of the current collectors 10 and 10 do not protrude above the electrode plate group 8, the volume of the battery case 4, and thus the volume of the rectangular battery case 3 can be reduced by the space.

(Second reference form)
Next, the 2nd reference form of the square sealed battery of this invention is demonstrated with reference to FIG. In the following description of the reference embodiment, the same components as those described in the reference embodiment of the preceding will be omitted with denoted by the same reference numerals, and only the differences will be described.

Rectangular battery jar 30 of this reference embodiment, between 4 the container partition wall 5 without having a single space 31 can be formed by concatenating a plurality of the container 4, and between which the container 4,4 formed of T-shaped grooves 32 having a T-shaped cross section are formed on both side walls of the portion corresponding to the partition wall.

  A current collector 20 having L-shaped flanges 21 formed on both sides thereof is joined to the lead portions 9 on both sides of the electrode plate group 8. As shown in FIG. 2A, the electrode plate group 8 is arranged in parallel with the current collectors 20 on both sides facing each other, and the current collectors 20 facing each other are joined by a conductive adhesive 17. Yes. Further, a sealing material 18 such as a pitch is applied to the outside of the T-shaped portion 22 formed by the L-shaped flange 21 of the joined current collector 20.

  As shown in FIG. 2 (b), the electrode plate group 8 integrally joined to each other is inserted and disposed in the space 31 of the battery case 30 with the T-shaped portion 22 fitted and engaged with the T-shaped groove 32. ing. Accordingly, the plurality of electrode plate groups 8 are connected to each other via the current collector 20, and the sealing material 18 is interposed between the outer periphery of the joined current collector 20 and the side wall of the rectangular battery case 30. Each battery case 4 is partitioned by the current collector 20.

  This rectangular sealed battery 1 is formed with a rectangular battery case 30 having a space 31 for forming a plurality of rectangular parallelepiped battery cases 4, while forming a plate group 8 and joining current collectors 20 on both sides thereof. Then, the electrode plate group 8 to which the current collector 20 is joined is connected and disposed, and the current collectors 20 facing each other are integrally joined with the conductive adhesive 17, and the outside of the T-shaped portion 22 is joined. The sealing material 18 is applied to the side surface, and then the joined electrode plate group 8 is inserted and disposed in the space 31 of the rectangular battery case 30 while the T-shaped portion 22 is fitted and engaged with the T-shaped groove 32. It is manufactured by accommodating the electrolyte in each battery case 4 formed between the current collectors 20 and closing the opening of the battery case 4.

According to this preferred embodiment, since a plurality of electrode plate group 8 is connected with the whole surface of the current collector 20, the overall current path between the electrode plate group 8 and 8 becomes short straight, the internal resistance remarkably Can be reduced. For this reason, a plurality of electrode plate groups 8 are inserted and arranged in the rectangular battery case 30 in a state where they are integrally connected. However, each electrode plate group 8 is appropriately charged by the sealing material 18 on the outer periphery of the current collector 20. The cell 4 can be formed by forming the tank 4. Further, since the current collectors 20 are connected by the conductive adhesive 17, they can be easily connected with good workability. Further, since the T-shaped portions 22 on both sides of the current collector 20 are fitted and engaged with the T-shaped grooves 32, it is easy to ensure a seal between the current collector 20 and the side wall of the rectangular battery case 30, and The side wall of the rectangular battery case 30 can be prevented from spreading due to the internal pressure acting on the battery case 4, and the seal can be reliably prevented from being broken.

The following describes various modifications of the present reference embodiment. In the first modification shown in FIG. 3, instead of applying the sealing material 18 to the outer surface of the T-shaped portion 22 on both sides of the current collector 20, the seal rubber 29 is applied over the entire outer periphery of the current collector 20. The outer periphery of the seal rubber 29 is pressed against the inner wall surface of the rectangular battery case 30 and the lid 6 to secure a seal between the battery cases. Therefore, the T-shaped groove 32 is not provided on the inner wall of the rectangular battery case 30. If it carries out like this, a highly reliable seal | sticker can be ensured, reducing an assembly man-hour. The seal rubber 29 is baked on both sides of the current collector 20 at the upper and lower ends so as to wrap an end portion in an appropriate range from the edge thereof, and the T-shaped portion 22 is baked and fixed on the outer surface thereof.

  In the illustrated example, the current collector 20 is joined with the conductive adhesive 17, and then the seal rubber 29 is baked on the outer periphery thereof. However, the electrode plate is attached to each current collector 20 previously baked with the seal rubber 29 on the outer periphery. The lead portions 9 of the group 8 are connected, and the current collectors 20 are joined to each other with the conductive adhesive 17, and then inserted into the prismatic battery case 30. It will be heavily sealed.

  In the second modification shown in FIG. 4, in order to join the current collectors 20 to each other, instead of the conductive adhesive 17, the current collectors 20, 20 have a width larger than the width of the current collector 20. While being brought into contact with each other via the conductive connection plate 51, both side edges of the current collector 20 and both side ends of the conductive connection plate 51 protruding therefrom are joined by fillet welding 52. Further, both ends of the conductive connection plate 51 are inserted into the sealing groove 53 formed on the inner side surface of the rectangular battery case 30 and the sealing material 18 such as a pitch is filled to seal between the battery cases 4 and 4. ing. In this way, the single cells can be joined with low resistance and high reliability, and a highly reliable seal can be secured. Note that seal rubber may be baked in place of the seal material 18 and the seal may be secured by pressure contact with the seal rubber.

  In the third modification shown in FIG. 5, in order to join the current collectors 20, instead of the conductive adhesive 17, connection protrusions 54 are formed on both sides of the current collector 20 so as to protrude from each other. The connecting protrusions 54 and 54 of the current collector 20 to be joined are brought into contact with each other, and the outer surfaces thereof are welded 55 with an electron beam or a laser beam to be joined. Further, a sealing material 18 such as a pitch is filled between the outer surface of the L-shaped flange 21 of the current collector 20 and the inner wall of the rectangular battery case 30 to seal the battery case 4 and 4. In this way, the single cells can be joined with low resistance and high reliability by welding the current collector 20. Note that seal rubber may be baked in place of the seal material 18 and the seal may be secured by pressure contact with the seal rubber.

  In the fourth modified example shown in FIG. 6, instead of the current collector 20, a U-shaped current collector 56 is formed in a U-shape by being bent, and L-shaped flanges 57 are formed outwardly on both side ends thereof. The lead portions 9 of the electrode plate groups 8 on both sides are joined to the U-shaped current collector 56. In the manufacturing process, after the lead portions of the electrode plate group 8 adjacent to the flat plate current collector having the L-shaped flanges 57 formed on both sides are joined by beam welding or the like, the current collector is U-shaped. The electrode plate groups 8 on both sides are easily joined to the U-shaped current collector 56 by bending it into a shape. In this way, the adjacent electrode plate groups 8 can be joined by one current collector 56, and can be joined with low resistance and high reliability, and the number of parts can be reduced, thereby reducing the cost. it can.

  And between the outer surface of the L-shaped flange 57 of the U-shaped current collector 56 and the inner wall of the rectangular battery case 30, and the inner and outer surfaces of the bent portion 56a of the U-shaped current collector 56 and the rectangular battery case 30. A sealing material 18 such as a pitch is filled between the inner wall and the battery case 4 and 4 for sealing. The sealing material 18 is also provided on the inner side surface of the bent portion 56a to prevent ions from flowing along the inner surface of the U-shaped current collector 56. Also in this example, a seal rubber may be baked instead of the seal material 18 and the seal may be secured by pressure contact with the seal rubber.

(First Embodiment)
Next, a first embodiment of the rectangular sealed battery of the present invention will be described with reference to FIG.

  In this embodiment, the conductive connection plate 23 is integrally provided by insert molding so as to face the battery cases 4 on both sides of the partition walls 5 on both side walls of the rectangular battery case 3. Further, a work opening 24 for exposing the conductive connection plate 23 to the outside of the rectangular battery case 3 is formed. The current collector 10 joined to the lead portions 9 on both sides of the electrode plate group 8 is formed in a U-shaped cross section, and the joining pieces 25 bent in an L shape on both sides thereof are brought into contact with the conductive connection plate 23, They are connected by a plurality of welds 26 arranged at appropriate pitch intervals. The welded portion 26 is welded by resistance welding or brazing. The work opening 24 is hermetically closed by a closing plate 27.

  The rectangular sealed battery 1 includes a rectangular battery case 3 having a conductive connecting plate 23 and a work opening 24, and current collectors 10 are bonded to both sides in each battery case 4 of the rectangular battery case 3. The electrode plate group 8 is inserted and arranged, the joining piece 25 of the current collector 10 and the conductive connection plate 23 are brought into contact with each other, and a plurality of the conductive connection plates 23 are arranged at appropriate pitch intervals from the work openings 24 on both sides. A welding current is applied between the conductive connecting plates 23 and 23 by applying a welding electrode to the location, the conductive connecting plate 23 and the joining piece 25 are resistance welded or brazed, and the work opening 24 is closed by the closing plate 27 after the welding is completed. It manufactures by sealing, after that, electrolyte solution is accommodated in each battery case 4 formed between the electrical power collectors 20, and the opening of the battery case 4 is closed.

  According to the present embodiment, since both sides of the current collector 10 can be connected to each other via the conductive connection plate 23, the energization path between the electrode plate groups 8 and 8 is shortened as a whole and the internal resistance is reduced. Moreover, since the upper part does not protrude above the electrode plate group for connecting the current collectors, the battery case volume can be reduced by the space.

  In this embodiment, the conductive connection plate 23 and the current collector 10 are connected by welding. However, the conductive connection plate 23 may be connected by a conductive adhesive, and the conductive connection plate 23 is provided on both sides. Only one side is acceptable.

( Third reference form)
Next, the 3rd reference form of the square sealed battery of this invention is demonstrated with reference to FIG.

In this reference embodiment, instead of the current collector 10 provided with the joining piece 25 in the first embodiment, a plurality of connecting shafts 28 are passed through the lead portions 9 on both sides of the electrode plate group 8 at appropriate pitch intervals. The both ends or one end of the connecting shaft 28 are connected to the conductive connecting plate 23.

Also in this reference embodiment, the same effects as those of the first embodiment can be achieved.

( 4th reference form)
Next, the 4th reference form of the square sealed battery of this invention is demonstrated with reference to FIG.

In this reference embodiment, a plurality of rectangular parallelepiped battery cases 4 are arranged in parallel at intervals, and one end portion of each end of each battery case 4 is alternately connected in a zigzag manner at the connection portion 41. A square battery case 40 is used. Further, the current collectors 10 on both sides are zigzag in a state where a plurality of electrode plate groups 8 having the current collectors 10 joined to the lead portions on both sides are arranged in parallel at the same pitch as the arrangement pitch of the battery case 4. The conductive connection plate 42 is connected. In this way, the plurality of electrode plate groups 8 connected by the conductive connection plate 42 are inserted and arranged in the rectangular battery case 40, and the conductive connection plate 42 is connected to the connection part 41 between the battery cases 4 and 4 of the rectangular battery case 40. Each battery case 4 is partitioned and formed by a sealing material 18 such as a pitch disposed between the rectangular battery case 40.

According to this preferred embodiment, since the connecting current collector 10 to each other of the electrode plate group 8 via a conductive connection plate 42 over its entire surface, overall current path between the electrode plate group 8, 8 short The internal resistance can be reduced, and the battery case 4 can be easily and reliably separated by sealing with the sealing material 18 between the connecting part 41 of the rectangular battery case 40 and the conductive connection plate 42. Thus, the unit cell 2 can be configured, and the space between the battery cases 4 and 4 can be used as the cooling medium passage 43, and high cooling performance can be obtained.

In this preferred embodiment, by joining the conductive connecting plate 42 to the collector 10 that is bonded to both sides of the electrode plate group 8, there is shown an example in which a plurality of connected electrode plate group 8 to the zigzag, the electrode plate group The current collectors 10 for every eight may be omitted, and the lead portions 9 on both sides of the electrode plate group 8 may be directly joined to the conductive connection plate 42 to connect the electrode plate group 8 in a zigzag shape.

( 5th reference form)
Next, a fifth reference embodiment of the rectangular sealed battery of the present invention will be described with reference to FIG.

In this reference embodiment, a plurality of rectangular parallelepiped battery cases 4 are arranged in parallel at intervals, and either one end of each end of each battery case 4 is alternately connected in a zigzag shape at a connecting portion 45, and the connection A rectangular battery case 44 in which the conductive connection plate 23 is disposed so as to face the battery case 4 on both sides is used as the part 45. In each battery case 4, the electrode plate group 8 in which the current collectors 10 are joined to the lead portions on both sides is accommodated and disposed, and the current collectors 10 and the conductive connection plates 23 are disposed at appropriate pitch intervals. A plurality of welds 46 are connected. The welded portion 46 opens a window in the rectangular battery case 44 and irradiates a laser beam to melt the brazing material attached to either the conductive connecting plate 23 or the conductive connecting plate 23 and the current collector 10. The window is sealed with a sealing material 47.

According to this preferred embodiment, the entire surface thereof via the conductive connection plate 23 a collector 10 between the electrode plate group 8 is possible configure cells 2 by inserting placing electrode plate group 8 to the battery jar 4 Therefore, the current path between the electrode plate groups 8 is shortened as a whole, the internal resistance can be reduced, and the space between the battery cases 4 and 4 can be used as the cooling medium passage 43 and has high cooling performance. Is obtained.

( Sixth reference form)
Next, a sixth reference embodiment of the rectangular sealed battery of the present invention will be described with reference to FIG.

In this reference embodiment, instead of the partition wall 5 of the rectangular battery case 3, the electric power is supplied by a crank-shaped conductive connection plate 33 that forms a connection surface 34 along the arrangement direction of the battery case 4 at the center in the battery case width direction. The tank 4 is partitioned. Further, the current collector 10 joined to the lead portions 9 on both sides of the electrode plate group 8 is joined with a joining piece 35 which is in contact with the connection surface 34, and the electrode plate group 8 arranged in the battery case 4 on both sides is joined. The joining pieces 35 of the current collector 10 are opposed to each other with the connection surface 34 interposed therebetween, and are connected by a welding portion 36. During the welding, the welding electrodes 37 can be arranged in the spaces on both sides of the connection surface 34 of the crank-shaped conductive connection plate 33, so that the welding can be reliably and reliably joined by resistance welding or the like.

According to this preferred embodiment, because it is connected via a crank-shaped conductive connection plate 33 between the collector 10 of the electrode plate group 8 constitutes a partition wall between the container 4,4, while the electrode plate group 8 The energization path of the battery can be shortened as a whole, the internal resistance can be reduced, and the upper portion of the current collector 10 does not protrude above the electrode plate group for connecting the current collectors 10, so that the battery cell volume corresponds to the space. Can be reduced.

  The present invention can be used for an assembled battery as a drive power source for an electric vehicle including a hybrid vehicle.

The 1st reference form of the square sealed battery of this invention is shown, (a) is a front view which shows the electrode group and the collector of the one side, (b) is a pole in each battery case of a square battery case. It is a vertical front view of the principal part of the state which inserted and arranged the board group and was connected. The 2nd reference form of the square sealed battery of this invention is shown, (a) is a top view of the principal part of the state which joined the some electrode plate group mutually, (b) is the state inserted and arranged in the square battery case It is a cross-sectional top view of the principal part. The 1st modification of the same reference form is shown, (a) is a longitudinal front view of the main part, (b) is a longitudinal side view, (c) is a transverse plan view. The 2nd modification of the same reference form is shown, (a) is a cross-sectional plan view of the main part, (b) is an A part enlarged view of (a). The 3rd modification of the reference form is shown, (a) is a transverse plan view of the main part, (b) is a B part enlarged view of (a). The 4th modification of the same reference form is shown, (a) is a cross-sectional plan view of the main part, (b) is an enlarged view of part C of (a), (c) is an enlarged view of part D of (a). . 1 shows a first embodiment of a rectangular sealed battery according to the present invention, where (a) is a cross-sectional plan view of the main part, and (b) is a front view of the part omitted. The 3rd reference form of the square sealed battery of this invention is shown, (a) is the cross-sectional top view of the principal part, (b) is the part abbreviation front view. It is a cross-sectional top view of the principal part of the 4th reference form of the square sealed battery of this invention. It is a cross-sectional top view of the principal part of the 5th reference form of the square sealed battery of this invention. It is a cross-sectional top view of the principal part of the 6th reference form of the square sealed battery of this invention. It is a partial vertical front view of the square sealed battery of a conventional example. It is the perspective view which fractured | ruptured and showed a part of battery case in the same prior art example. It is explanatory drawing of the electricity supply path | route in the same prior art example.

DESCRIPTION OF SYMBOLS 1 Square sealed battery 3 Square battery case 4 Battery case 5 Bulkhead 8 Electrode group 9 Lead part 10 Current collector 17 Conductive adhesive 18 Sealing material 19 Connection opening 20 Current collector 21 L-shaped flange 22 T-shaped part 23 Conductivity Connecting plate 24 Work opening 25 Joint piece 26 Welded portion 28 Connection shaft 29 Seal rubber 30 Square battery case 31 Space 32 T-shaped groove 33 Crank-shaped conductive connecting plate 34 Connection surface 36 Welded portion 40 Square battery case 41 Connection portion 42 Conductive connection plate 44 Square battery case 45 Connecting portion 51 Conductive connection plate 52 Fillet weld 54 Connection projection 55 Welding 56 U-shaped current collector

Claims (3)

A plurality of rectangular parallelepiped batteries having a short short side and a wide long side are stacked, a rectangular battery case connected to the short side as a partition, a positive electrode plate and a negative electrode plate are laminated via a separator. A positive electrode plate and a negative electrode plate, the electrode plate group projecting to the opposite side to each other as a lead portion, and a current collector joined to the lead portions on both sides of the electrode plate group, In the square sealed battery that houses the electrode plate group joined with the current collector plate,
Conductive connection plates facing the battery case on both sides of the partition wall are disposed on at least one side wall of the square battery case,
A working opening is provided to expose the conductive connection plate to the outside of the rectangular battery case,
The conductive connection plate is connected to the current collector located on both sides of the partition wall at a plurality of locations in the work opening, and the work opening is hermetically closed by a closing plate. A square sealed battery. 2. The current collector is formed in a U-shaped cross section, has joint pieces bent into L-shapes on both sides thereof , and the conductive connection plate is connected to the joint pieces. The prismatic sealed battery described.   The square sealed battery according to claim 2, wherein the joining piece and the conductive connecting plate are connected by resistance welding or brazing.

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