JP2007026907A - Battery and manufacturing method of battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery allowing electrode terminals to be easily positioned in jointing the electrode terminals to each other; and to provide a manufacturing method of a battery pack composed by connecting the plurality of such batteries to one another. <P>SOLUTION: Cells 110 and 140 have positive electrode terminals 120 and 150 and negative electrode terminals 130 and 160, respectively. The negative electrode terminal 160 of the cell 140 is provided with a negative electrode second extension part 163 having projecting parts 165. The positive electrode terminal 120 of the cell 120 is provided with a positive electrode second extension part 123 having reception parts 125 comprising cutouts. When the cells 110 and 140 are arranged adjacently to each other, the negative electrode second extension part 163 of the cell 140 is superposed on the positive electrode second extension part 123 of the cell 110 and the projecting parts 165 are fitted to the reception parts 125. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a battery including a first electrode terminal and a second electrode terminal protruding from a case and configured to be electrically connected to another battery disposed adjacent to the battery, and such a battery. It is related with the manufacturing method of the assembled battery formed by electrically connecting two or more.

  Conventionally, a battery configured to be electrically connected to other batteries arranged adjacent to each other, and a battery pack in which a plurality of such batteries are electrically connected are known. As a first conventional technique, FIG. 13 shows a state in which a set of single cells 710 and 740 are arranged adjacent to each other and electrically connected in the assembled battery 700. The unit cells 710 and 740 constituting the assembled battery 700 are so-called laminate cells in which battery elements are surrounded by a laminate resin film. One unit cell 710 has a positive electrode terminal 720 and a negative electrode terminal 730, and the other unit cell 740 also has a positive electrode terminal 750 and a negative electrode terminal 760.

  The positive electrode terminal 720 of one unit cell 710 has a plate-like positive electrode first extension 721 extending from one end side (upward in the drawing) of the unit cell 710 and the tip of the positive electrode first extension 721. It has a plate-like positive electrode second extending portion 723 that is bent at a right angle at a portion and extends in the arrangement direction H of the cells 710 and 740. Further, the negative electrode terminal 760 of the other unit cell 740 also has a plate-like negative electrode first extension 761 extending from one end side (upward in the drawing) of the unit cell 740, and the negative electrode first extension 761. And a plate-like negative electrode second extension portion 763 that is bent at a right angle at the tip portion and extends in the arrangement direction H. In addition, the positive electrode 2nd extension part 723 and the negative electrode 2nd extension part 763 are extended toward the mutually opposite direction. The unit cells 710 and 740 arranged adjacent to each other are in a state where the positive electrode second extension portion 723 of one unit cell 710 and the negative electrode second extension portion 763 of the other unit cell 740 are overlapped. Then, they are connected in series by welding them by a technique such as spot welding.

  As a second conventional technique, FIG. 14 shows a state in which a set of single cells 810 and 840 of the assembled battery 800 are arranged adjacent to each other and electrically connected. The single cells 810 and 840 constituting the assembled battery 800 are also laminate cells. One unit cell 810 has a positive electrode terminal 820 and a negative electrode terminal 830, and the other unit cell 840 also has a positive electrode terminal 850 and a negative electrode terminal 860.

  The positive electrode terminal 820 of one unit cell 810 includes a plate-shaped first positive extension 821 extending from one end side (upward in the drawing) of the single cell 810 and the tip of the positive first extension 821. The plate-like positive electrode second extending portion 823 that is bent at a right angle and extends in the arrangement direction H of the single cells 810 and 840, and further, the front end portion of the positive electrode second extending portion 823 is bent at a right angle. It has a plate-like positive third extension portion 825 extending in parallel with the positive first extension portion 821. In addition, the negative electrode terminal 860 of the other unit cell 840 also has a plate-like negative electrode first extension 861 extending from one end side (upward in the drawing) of the unit cell 840, and the negative electrode first extension 861. The plate-like negative electrode second extension portion 863 that is bent at a right angle at the tip portion of the negative electrode and extends in the arrangement direction H, and further bent at a right angle at the tip portion of the negative electrode second extension portion 863 to be negative electrode first. It has a plate-like negative electrode third extending portion 865 extending in parallel with the extending portion 861. In addition, the positive electrode 2nd extension part 823 and the negative electrode 2nd extension part 863 are extended toward the mutually opposite direction. The cells 810 and 840 arranged adjacent to each other are in a state in which the positive electrode third extending portion 825 of one of the single cells 810 and the negative electrode third extending portion 865 of the other single cell 840 are overlapped. Then, they are connected in series by welding them by a technique such as spot welding.

  Furthermore, as a third prior art, FIG. 15 shows a state in which a set of unit cells 910 and 940 are arranged adjacent to each other and electrically connected in the assembled battery 900. The single cells 910 and 940 constituting the assembled battery 900 are also laminate cells. One unit cell 910 has a positive electrode terminal 920 and a negative electrode terminal 930, and the other unit cell 940 also has a positive electrode terminal 950 and a negative electrode terminal 960.

  The positive electrode terminal 920 of one unit cell 910 includes a plate-shaped first positive extension 921 extending from one end side (upward in the drawing) of the single cell 910 and the tip of the positive first extension 921. It has a plate-like positive electrode second extension portion 923 that is bent at a right angle and extends in the arrangement direction H of the cells 910 and 940. Further, the negative electrode terminal 960 of the other unit cell 940 also has a plate-like negative electrode first extension 961 extending from one end side (upward in the drawing) of the unit cell 940, and this negative electrode first extension 961. And a plate-like negative electrode second extending portion 963 that is bent at a right angle at the tip portion and extends in the arrangement direction H. In addition, the positive electrode 2nd extension part 923 and the negative electrode 2nd extension part 963 are extended toward the mutually opposite direction. The unit cells 910 and 940 arranged adjacent to each other are connected to the tip of the positive electrode second extension 923 of one unit cell 910 and the tip of the negative electrode second extension 963 of the other unit cell 940. Are connected in series by welding them with a technique such as spot welding.

  Other conventional techniques include the battery pack disclosed in Patent Document 1 and the battery disclosed in Patent Document 2.

JP-A-11-167912 JP 2003-77442 A

  The assembled battery 700 shown as the prior art 1 is such that when the positive electrode second extending portion 723 of one unit cell 710 and the negative electrode second extending portion 733 of the other unit cell 740 are overlapped, they are both flat. Therefore, in addition to the arrangement direction H of the single cells 710 and 740, the positive electrode terminal 720 and the negative electrode terminal 730 move in the terminal arrangement direction L in the direction orthogonal to the arrangement direction H. Is possible. For this reason, in the terminal arrangement direction L, it is difficult to accurately position and weld the positive electrode terminal 720 of one unit cell 710 and the negative electrode terminal 760 of the other unit cell 740.

  On the other hand, in the assembled battery 800 shown as the prior art 2, when the positive electrode third extending portion 825 of one unit cell 810 and the negative electrode third extending portion 865 of the other unit cell 840 are brought into contact with each other. In addition, since they are both flat, they can move to each other in a direction perpendicular to the arrangement direction H of the single cells 810 and 840 (for example, the terminal arrangement direction L and the vertical direction in the figure). For this reason, it is difficult to accurately position and weld the positive electrode terminal 820 of one unit cell 810 and the negative electrode terminal 860 of the other unit cell 840 in the direction orthogonal to the arrangement direction H. Furthermore, since the positive electrode third extending portion 835 of the unit cell 810 and the negative electrode third extending portion 865 of the unit cell 840 must be brought into contact with each other during welding, positioning tolerance in the arrangement direction H is small. .

  Furthermore, in the assembled battery 900 shown as the prior art 3, the positive electrode second extending portion 923 of one unit cell 910 and the negative electrode second extending portion 963 of the other unit cell 940 are abutted and brought into contact with each other. In this case, it is possible to move each other in a direction orthogonal to the arrangement direction H of the single cells 910 and 940 (for example, the terminal arrangement direction L and the vertical direction in the figure). For this reason, it is difficult to accurately position and weld the positive electrode terminal 920 of one unit cell 910 and the negative electrode terminal 960 of the other unit cell 940 in a direction orthogonal to the arrangement direction H. Further, when welding, the positive electrode second extending portion 923 of the unit cell 910 and the negative electrode second extending portion 963 of the unit cell 940 must be brought into contact with each other at the tip end, so that positioning in the arrangement direction H is performed. The tolerance of is small. In addition, since the positive electrode second extending portion 923 of the unit cell 910 and the negative electrode second extending portion 963 of the unit cell 940 are welded at the tips, the welded portion is reduced. For this reason, the bonding strength between the positive electrode terminal 920 and the negative electrode terminal 960 tends to be small, and the electric resistance of the bonded portion tends to be large.

  The present invention has been made in view of the current situation, and provides a battery capable of easily positioning electrode terminals when connecting the batteries, and a method of manufacturing an assembled battery in which a plurality of such batteries are connected. The purpose is to provide.

  The solution is a battery comprising a first electrode terminal and a second electrode terminal projecting from a case, the battery configured to be electrically connected to another battery disposed adjacent to the battery, 1 electrode terminal is provided with the convex junction part which has a convex part, and when the said 2nd electrode terminal arrange | positions the said other battery adjacently, the acceptance which overlaps with the said convex junction part of the said 1st electrode terminal in another battery The battery includes a receiving joint portion having a receiving portion including a through hole or a notch that is a joint portion and is fitted to the convex portion.

  According to the present invention, when the batteries are arranged next to each other, the convex joint portion of the first electrode terminal of one battery overlaps the receiving joint portion of the second electrode terminal of the other battery, and is provided at the convex joint portion. The convex portion thus formed and the receiving portion provided at the receiving joint portion are fitted. For this reason, when joining the 1st electrode terminal and 2nd electrode terminal of adjacent batteries, positioning of electrode terminals is easy.

  For example, in the unit cell 710 shown in the related art 1, when the positive electrode terminal 720 and the negative electrode terminal 760 are joined by spot welding, the positive electrode second extension portion 723 and the negative electrode second extension portion 763 In order to allow the current to flow between them, a sufficient space for arranging jigs around these is required. For this reason, since the arrangement | positioning space | interval of the single cells 710 and 740, or the positive electrode terminal 720 and the negative electrode terminal 760 must be enlarged, it is difficult to reduce the size of the single cells 710 and 740 and the assembled battery 700.

  On the other hand, in the present invention, the convex joint and the receiving joint can be overlapped, and the convex and the receiving part can be welded by irradiating a laser, an electron beam, or the like from the receiving joint. It is only necessary to secure a space for welding. Accordingly, the arrangement interval between the batteries can be reduced, and the first and second electrode terminals can be reduced. Furthermore, when the assembled battery is configured, the assembled battery can be reduced in size.

  Here, the convex portion and the receiving portion can be in any form as long as they fit each other when the convex joint portion and the receiving joint portion are overlapped. For example, the convex portion may be a columnar shape such as a cylinder or a prism, while the receiving portion may be a through hole or a notch having a circular or polygonal opening that fits the receiving portion. Further, when the convex portion is viewed from the protruding direction, the convex portion has a meandering shape such as an S shape, an L shape, an elongated shape, or the like, and the receiving portion can be a through-hole or a notch to be fitted therewith. . Further, each of the convex portion and the receiving portion may be singular or plural. In addition, the form of the convex joint and the receiving joint can be appropriately selected in consideration of the form of the convex part and the receiving part to be formed, and the convex part and the receiving part to be the other party.

  Furthermore, in the battery described above, it is preferable that the convex portion is a battery having an elongated shape when viewed from the protruding direction.

  According to the present invention, the convex portion has an elongated shape when viewed from the protruding direction. For this reason, in joining the first electrode terminal and the second electrode terminal, the welding distance between the convex portion and the receiving portion can be increased. Accordingly, the bonding between the first electrode terminal and the second electrode terminal can be strengthened. In addition, the electrical resistance at the joint can be reduced.

  Furthermore, in the battery according to any one of the above, the first electrode terminal and the second electrode terminal include the convex joint portion of the first electrode terminal for one battery and the first electrode terminal for the other battery. In the state where the receiving joint portion of the two-electrode terminals is overlapped and the convex portion and the receiving portion are fitted, the movement in the direction orthogonal to the arrangement direction of the batteries is restricted, while the movement in the arrangement direction is restricted. It is preferable to use a battery that can be moved.

  According to the present invention, the first electrode terminal and the second electrode terminal are orthogonal to the arrangement direction of the batteries in a state in which the convex joint and the receiving joint are overlapped and the convex and the receiving part are fitted. While movement in the direction in which the battery is to be controlled is restricted, movement in the direction in which the batteries are arranged is possible. For this reason, when joining the first electrode terminal and the second electrode terminal, the electrode terminals can be accurately positioned with respect to the direction orthogonal to the battery arrangement direction, and the positioning tolerance is provided for the battery arrangement direction. growing. Thus, when the positioning tolerance is large in the arrangement direction, the dimensional tolerance in the arrangement direction of each battery can be absorbed by changing the interval between the electrode terminals.

  Furthermore, in the battery according to any one of the above, it is preferable that a plurality of the convex portions and the receiving portions are formed.

  According to the present invention, a plurality of convex portions and receiving portions are formed. For this reason, since each convex part and a receiving part can be welded, joining of a 1st electrode terminal and a 2nd electrode terminal can be strengthened further. Moreover, the electrical resistance between the electrode terminals can be further reduced.

  Furthermore, in the battery according to any one of the above, the case is made of a laminate resin film, and the receiving joint portion includes the convex joint portion in a state where the convex joint portion and the receiving joint portion are overlapped. It is better to use a battery that is positioned away from the case.

When the case is a laminated resin film, when welding the first electrode terminal and the second electrode terminal, a spatter (spark) hits the case and a hole is formed in the case, for example, for a battery having a metal case. In comparison, the battery is easily damaged.
In contrast, in the present invention, when the convex joint and the receiving joint are overlapped and the convex and the receiving part are welded from the receiving joint, the receiving joint is positioned farther from the case than the convex joint. Therefore, it is possible to suppress the spatter from scattering to the convex joint portion side, that is, the case side. Therefore, damage to the battery due to sputtering can be suppressed.

  Another solution is provided with a plurality of batteries each having a first electrode terminal and a second electrode terminal, and at least one set of the batteries arranged adjacent to each other with the first electrode terminal of one battery. A method of manufacturing an assembled battery by electrically connecting the second electrode terminal of the other battery, wherein the first electrode terminal includes a convex joint having a convex part, and the second electrode terminal is When the batteries are arranged next to each other, a receiving joint that overlaps with the convex joint of another battery and has a receiving joint made of a through-hole or notch that fits into the convex is provided. The batteries are arranged next to each other, and the convex joint of one battery and the receiving part of the other battery are fitted together, and the convex joint and the receiving joint are overlapped to align them. Alignment process and after the alignment process A welding step of welding the said receiving portion and the protruding portion from the receiving joint portion, a manufacturing method of an assembled battery comprising a.

  According to the method for manufacturing an assembled battery of the present invention, in the positioning step, the batteries are arranged next to each other, and the convex portion of one battery and the receiving portion of the other battery are fitted together, and the convex joint portion and the receiving portion are received. These positions are aligned by overlapping the joint. For this reason, alignment with the 1st electrode terminal and the 2nd electrode terminal is easy. Moreover, in a welding process, a convex part and a receiving part are welded from the receiving joining part side. For this reason, it is sufficient to secure a space for welding only on the receiving joint side. Therefore, it is easy to secure a space for welding.

  Another solution is provided with a first electrode terminal and a second electrode terminal protruding from the case, and is configured to be electrically connected to another battery arranged adjacent to each other via a terminal connection member. When the first electrode terminal is overlaid on the member-side first convex joint portion of the terminal connection member provided with a member-side first convex joint portion having a member-side first convex portion, A terminal-side first receiving joint portion having a terminal-side first receiving portion made of a through-hole or a notch fitted with the member-side first convex portion, or a member-side first receiving portion made of a through-hole or a notch. The terminal side which has the terminal side 1st convex part fitted to the said member side 1st receiving part when the said member side 1st receiving joint part of the said terminal connection member provided with the member side 1st receiving joint part which has is piled up A first convex joint is provided, and the second electrode terminal has a member-side second convex. A terminal-side second comprising a through-hole or notch that fits with the member-side second convex portion when the member-side second convex joint portion is overlapped with the member-side second convex joint portion of the terminal connecting member provided with the member-side second convex joint portion. The member side second receiving joint having the terminal side second receiving joint having a terminal side second receiving joint having a receiving part or a member side second receiving joint having a member side second receiving part formed of a through hole or a notch. It is a battery provided with the terminal side 2nd convex junction part which has a terminal side 2nd convex part fitted to the said member side 2nd receiving part when a part is piled up.

  According to the present invention, when the terminal-side first receiving joint portion of the first electrode terminal is overlapped with the member-side first convex joint portion of the terminal connecting member, the terminal-side first provided on the terminal-side first receiving joint portion is provided. 1 receiving part and the member side 1st convex part provided in the member side 1st convex junction part fit. Alternatively, when the terminal side first convex joint portion of the first electrode terminal is overlapped with the member side first receiving joint portion of the terminal connection member, the terminal side first convex portion provided on the terminal side first convex joint portion and The member side first receiving portion provided at the member side first receiving joint portion is fitted. For this reason, when joining a 1st electrode terminal and a terminal connection member, these positioning is easy.

  Further, when the terminal side second receiving joint portion of the second electrode terminal is overlapped with the member side second convex joint portion of the terminal connecting member, the terminal side second receiving portion provided in the terminal side second receiving joint portion; The member side 2nd convex part provided in the member side 2nd convex junction part fits. Alternatively, when the terminal-side second convex joint portion of the second electrode terminal is superimposed on the member-side second receiving joint portion of the terminal connecting member, the terminal-side second convex portion provided in the terminal-side second convex joint portion and The member side second receiving portion provided at the member side second receiving joint portion is fitted. For this reason, when joining a 2nd electrode terminal and a terminal connection member, these positioning is easy.

  Moreover, in this invention, the terminal side 1st receiving junction part of a 1st electrode terminal is piled up on the member side 1st convex junction part of a terminal connection member, and a terminal side 1st receiving part from the terminal side 1st receiving junction part side, The member side first convex portion can be welded. Alternatively, the terminal-side first convex joint portion of the first electrode terminal is overlapped with the member-side first receiving joint portion of the terminal connection member, and the terminal-side first convex portion and the member-side first are placed from the member-side first receiving joint portion side. The receiving part can be welded. For this reason, it is sufficient to ensure a space for welding only on the terminal side first receiving joint portion side or on the member side first receiving joint portion side. Therefore, the arrangement | positioning space | interval of batteries can be made small and a 1st electrode terminal and a terminal connection member can also be made small.

  Also, the end side second receiving joint portion of the second electrode terminal is overlapped on the member side second convex joint portion of the terminal connecting member, and the terminal side second receiving portion and the member side second side from the terminal side second receiving joint portion side. 2 convex portions can be welded. Alternatively, the terminal-side second convex joint portion of the second electrode terminal and the member-side second receiving joint portion of the terminal connecting member are overlapped, and the terminal-side second convex portion and the member-side second side are arranged from the member-side second receiving joint portion side. 2 The receiving part can be welded. For this reason, it is sufficient to secure a space for welding only on the terminal side second receiving joint portion side or the member side second receiving joint portion side. Therefore, the arrangement | positioning space | interval of batteries can be made small, and a 2nd electrode terminal and a terminal connection member can also be made small.

  Here, the member side first convex portion and the terminal side first receiving portion, the member side first receiving portion and the terminal side first convex portion, the member side second convex portion and the terminal side second receiving portion, and the member side first convex portion. About the form of 2 receiving parts and a terminal side 2nd convex part, it can consider similarly to the convex part and receiving part which were mentioned above, respectively. In addition, the member side first convex joint portion and the terminal side first receiving portion, the member side first receiving joint portion and the terminal side first convex joint portion, the member side second convex joint portion and the terminal side second receiving portion, and The configurations of the member-side second receiving joint and the terminal-side second convex joint can also be considered in the same manner as the convex joint and the receiving joint described above.

  Furthermore, in the battery described above, it is preferable that at least one of the terminal-side first convex portion and the terminal-side second convex portion is an elongated battery as viewed from the protruding direction thereof.

  According to the present invention, when the terminal-side first convex portion has an elongated shape, the welding distance between the terminal-side first convex portion and the member-side first receiving portion is set in joining the first electrode terminal and the terminal connecting member. Can be long. Accordingly, the bonding between the first electrode terminal and the terminal connection member can be strengthened. Moreover, the electrical resistance in these junction parts can be made small. Further, when the terminal-side second convex portion has an elongated shape, the welding distance between the terminal-side second convex portion and the member-side second receiving portion may be increased in joining the second electrode terminal and the terminal connecting member. it can. Therefore, the bonding between the second electrode terminal and the terminal connection member can be strengthened. Moreover, the electrical resistance in these junction parts can be made small.

  Furthermore, in the battery according to any one of the above, in the state where the first electrode terminal overlaps the terminal connection member and the member-side first convex portion is fitted to the terminal-side first receiving portion. Or, in a state where the terminal-side first convex portion is fitted to the member-side first receiving portion, the movement in the direction orthogonal to the arrangement direction with the other battery is restricted, while in the arrangement direction. The second electrode terminal is in a state where the terminal connection member is overlapped and the member side second convex portion is fitted to the terminal side second receiving portion, or In the state where the terminal side second convex portion is fitted to the member side second receiving portion, the movement in the direction orthogonal to the arrangement direction is restricted while the movement in the arrangement direction is enabled. It is better to use the battery.

  According to the present invention, the first electrode terminal and the terminal connecting member are in a state in which the member-side first convex portion and the terminal-side first receiving portion are fitted, or the member-side first receiving portion and the terminal side. While the movement in the direction orthogonal to the arrangement direction of the batteries is restricted with the first convex portion fitted, the movement in the arrangement direction of the batteries is possible. For this reason, when joining a 1st electrode terminal and a terminal connection member, these can be positioned correctly about the direction orthogonal to the arrangement direction of a battery, and the tolerance of positioning becomes large about the arrangement direction of a battery. Thus, when the positioning tolerance is large in the arrangement direction, the dimensional tolerance in the arrangement direction of each battery can be absorbed by changing the interval between the first electrode terminal and the terminal connection member.

  Further, the second electrode terminal and the terminal connecting member are in a state in which the member side second convex portion and the terminal side second receiving portion are fitted, or the member side second receiving portion and the terminal side second convex portion. In a state where the two are fitted together, movement in the direction orthogonal to the arrangement direction of the batteries is restricted, while movement in the arrangement direction of the batteries becomes possible. For this reason, when joining a 2nd electrode terminal and a terminal connection member, these can be correctly positioned about the direction orthogonal to the arrangement direction of a battery, and the tolerance of positioning becomes large about the arrangement direction of a battery. When the positioning tolerance is large in the arrangement direction as described above, the dimensional tolerance in the arrangement direction of each battery can be absorbed by changing the distance between the second electrode terminal and the terminal connection member.

  Furthermore, in the battery according to any one of the above, the terminal-side first receiving part or the terminal-side first convex part, and the terminal-side second receiving part or the terminal-side second convex part are respectively It is preferable that a plurality of formed batteries be used.

  According to the present invention, a plurality of terminal side first receiving portions or terminal side first convex portions are formed. Therefore, if a plurality of member-side first convex portions or member-side first receiving portions are formed on the terminal connection member, each terminal-side first receiving portion and member-side first convex portion, or each terminal side Since the 1st convex part and the member side 1st receiving part can be welded, joining of the 1st electrode terminal and a terminal connection member can be strengthened further. Moreover, the electrical resistance between the first electrode terminal and the terminal connection member can be further reduced.

  A plurality of terminal-side second receiving portions or terminal-side second convex portions are formed. Therefore, if a plurality of member-side second convex portions or member-side second receiving portions are formed on the terminal connection member, each terminal-side second receiving portion and member-side second convex portion, or each terminal side Since the 2nd convex part and the member side 2nd receiving part can be welded, joining of the 2nd electrode terminal and a terminal connection member can be strengthened further. Moreover, the electrical resistance between the second electrode terminal and the terminal connection member can be further reduced.

  Furthermore, in the battery according to any one of the above, the case is made of a laminated resin film, and the terminal-side first receiving joint is in a state where the terminal connection member is overlaid on the first electrode terminal. It is configured to be positioned farther from the case than the member-side first convex joint portion, or the terminal-side first convex joint portion is in a state where the terminal connection member is overlaid on the first electrode terminal. In the state where the terminal side second receiving joint portion is overlapped on the second electrode terminal, the terminal side second receiving joint portion is configured to be positioned closer to the case side than the member side first receiving joint portion. It is configured to be located farther from the case than the member-side second convex joint, or the terminal-side second convex joint is in a state where the terminal connection member is overlaid on the second electrode terminal. The member side Than receiving the joint may be a cell formed by a form located on the case side.

  In the present invention, the member-side first convex joint and the terminal-side first receiving joint are overlapped, and the member-side first convex and the terminal-side first receiving part are welded from the terminal-side first receiving joint. In addition, since the terminal side first receiving joint portion is located farther from the case than the member side first convex joint portion, it is possible to suppress the spatter from scattering to the member side first convex joint portion side, that is, the case side. . Alternatively, when the member-side first receiving joint and the terminal-side first convex joint are overlapped and the member-side first receiving joint and the terminal-side first convex are welded from the member-side first receiving joint, Since the member side first receiving joint portion is located farther from the case than the terminal side first convex joint portion, it is possible to suppress the spatter from being scattered to the terminal side first convex joint portion side, that is, the case side.

  Further, when the member-side second convex joint and the terminal-side second receiving joint are overlapped and the member-side second convex and the terminal-side second receiving part are welded from the terminal-side second receiving joint, Since the terminal side second receiving joint portion is located farther from the case than the member side second convex joint portion, it is possible to suppress the spatter from scattering to the member side second convex joint portion side, that is, the case side. Alternatively, when the member-side second receiving joint and the terminal-side second convex joint are overlapped and the member-side second receiving joint and the terminal-side second convex are welded from the member-side second receiving joint, Since the member side second receiving joint portion is located farther from the case than the terminal side second convex joint portion, it is possible to suppress the spatter from being scattered to the terminal side second convex joint portion side, that is, the case side. Therefore, damage to the battery due to sputtering can be suppressed.

  Another solution is provided with a plurality of batteries each having a first electrode terminal and a second electrode terminal, and at least one set of the batteries arranged adjacent to each other with the first electrode terminal of one battery. A method of manufacturing an assembled battery in which the second electrode terminal of the other battery is electrically connected via a terminal connecting member, wherein the terminal connecting member and the first electrode terminal are member-side first protrusions. A terminal connecting member having a member-side first convex joint having a portion, and a terminal-side first receiving joint overlapping with the member-side first convex joint, and fitting with the member-side first convex A first electrode terminal having a terminal-side first receiving joint portion having a terminal-side first receiving portion made of a through-hole or a notch, or a member side having a member-side first receiving portion made of a through-hole or a notch A terminal connection member comprising a first receiving joint, and A terminal-side first convex joint that overlaps with the member-side first receiving joint, the terminal-side first convex joint having a terminal-side first convex that fits with the member-side first receiving part. The terminal connection member and the second electrode terminal are a terminal connection member including a member-side second convex joint portion having a member-side second convex portion, and the member-side second convex joint portion. A second electrode provided with a terminal-side second receiving joint portion, which is a terminal-side second receiving joint portion, which is a terminal-side second receiving joint portion that has a terminal-side second receiving portion formed of a through-hole or a notch that fits with the member-side second convex portion A terminal connection member including a member-side second receiving joint portion having a member-side second receiving portion which is a terminal or a through hole or a notch, and a terminal-side second overlapping the member-side second receiving joint portion A terminal-side second convex portion which is a convex joint and is fitted to the member-side second receiving portion It is a 2nd electrode terminal provided with the terminal side 2nd convex junction part which has, The above-mentioned member side 1st convex junction part and the above-mentioned terminal while fitting the above-mentioned member side 1st convex part and the above-mentioned terminal side 1st receiving part The member side first receiving joint portion is overlapped with the side first receiving joint portion, or the member side first receiving joint portion is fitted with the member side first receiving portion and the terminal side first convex portion. The member-side second convex joint portion is overlapped with the terminal-side first convex joint portion to align them, and the member-side second convex portion and the terminal-side second receiving portion are fitted together. And the terminal side second receiving joint portion are overlapped to align them, or the member side second receiving portion and the terminal side second convex portion are fitted together while the member side second receiving portion is fitted. An alignment step of overlapping the bonding portion and the terminal-side second convex bonding portion to align them, and the position After the alignment step, the member-side first convex portion and the terminal-side first receiving portion are welded from the terminal-side first receiving joint portion side, or the member-side first receiving joint portion side is welded to the member-side first receiving portion. Welding the first receiving portion and the terminal side first convex portion, and welding the member side second convex portion and the terminal side second receiving portion from the terminal side second receiving joint portion side, or It is a manufacturing method of an assembled battery provided with the welding process which welds the said member side 2nd receiving part and the said terminal side 2nd convex part from the member side 2nd receiving junction part side.

  According to the assembled battery manufacturing method of the present invention, in the alignment step, the member-side first convex joint and the terminal-side first receiving are fitted while the member-side first convex and the terminal-side first receiving are fitted. These positions are aligned by overlapping the joint. Alternatively, the member-side first receiving joint portion and the terminal-side first convex joint portion are overlapped with each other while the member-side first receiving portion and the terminal-side first convex portion are fitted. For this reason, alignment with a 1st electrode terminal and a terminal connection member is easy.

  Further, in this alignment step, the member-side second convex joint and the terminal-side second receiving joint are overlapped with each other while fitting the member-side second convex and the terminal-side second receiving part. Align. Alternatively, the member-side second receiving joint portion and the terminal-side second convex joint portion are overlapped with each other while the member-side second receiving portion and the terminal-side second convex portion are fitted. For this reason, alignment with a 2nd electrode terminal and a terminal connection member is also easy.

  Moreover, in the manufacturing method of this invention, a member side 1st convex part and a terminal side 1st receiving part are welded from the terminal side 1st receiving joint part side in a welding process. Alternatively, the member-side first receiving portion and the terminal-side first convex portion are welded from the member-side first receiving joint portion side. For this reason, it is sufficient to ensure a space for welding only on the terminal side first receiving joint portion side or on the member side first receiving joint portion side. Therefore, it is easy to secure a space for welding the member-side first convex portion and the terminal-side first receiving portion.

  Moreover, in this welding process, the member side 2nd convex part and the terminal side 2nd receiving part are welded from the terminal side 2nd receiving junction part side. Alternatively, the member side second receiving portion and the terminal side second convex portion are welded from the member side second receiving joint portion side. For this reason, it is sufficient to secure a space for welding only on the terminal side second receiving joint portion side or the member side second receiving joint portion side. Therefore, it is easy to secure a space for welding the member-side second convex portion and the terminal-side second receiving portion.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which a set of single cells 110 and 140 are arranged adjacent to each other and electrically connected in the assembled battery 100 according to the first embodiment. FIG. 2 shows a part of the positive electrode terminal 120 and the negative electrode terminal 160 connected to each other. Further, FIG. 3 shows a state in which the positive electrode terminal 120 and the negative electrode terminal 160 are connected.

  The assembled battery 100 includes a plurality of single cells (batteries) 110 and 140 arranged in a line. Each of the single cells 110 and 140 is a laminate cell in which a well-known battery element (not shown) and an electrolytic solution are surrounded and sealed by a case 111 made of a laminate resin film. These unit cells 110 and 140 are lithium secondary batteries. One unit cell 110 has a positive electrode terminal (second electrode terminal) 120 and a negative electrode terminal (first electrode terminal) 130. The other unit cell 140 includes a positive electrode terminal (second electrode terminal) 150 and a negative electrode terminal (first electrode terminal) 160. These single cells 110 are lithium secondary batteries.

  The positive electrode terminal 120 of one unit cell 110 is formed by bending a metal plate or the like. The positive electrode terminal 120 has a plate-like positive first extension part 121 extending from one end side (upward in FIG. 1) of the unit cell 110 and a right end at the tip of the positive first extension part 121. It has a plate-like positive electrode second extending portion (receiving joint portion) 123 that is bent and extends in the arrangement direction H between the single cells 110 and 140. The positive electrode first extension 121 has a thickness of about 1 mm, a width (a length in the left-right direction in FIGS. 1 to 3) of about 10 mm, and a length (a length in the vertical direction in FIGS. 1 to 3) of about 10 mm. It is.

  The positive electrode second extension 123 has a thickness of about 1 mm, a width (a length in the left-right direction in FIGS. 1 to 3), and a length (a length in the arrangement direction H in FIGS. 1 to 3). ) About 10 mm. The positive electrode second extending portion 123 is formed with a receiving portion 125 formed of an elongated notch extending in the arrangement direction H to the tip of the positive electrode second extending portion 123. Three receiving portions 125 are formed in parallel at a predetermined interval. Each receiving part 125 has a width of about 2 mm and a length of about 5 mm.

  The negative electrode terminal 160 of the other unit cell 140 is formed by bending a metal plate or the like. The negative electrode terminal 160 has a plate-like negative electrode first extending portion 161 extending from one end side (upward in FIG. 1) of the unit cell 140 and a front end portion of the negative electrode first extending portion 161 at a right angle. It has a plate-like negative electrode second extension part (convex joint part) 163 that bends and extends in the arrangement direction H. The negative electrode first extension 161 has a thickness of about 1 mm, a width (a length in the left-right direction in FIGS. 1 to 3) of about 10 mm, and a length (a length in the vertical direction in FIGS. 1 to 3) of about 10 mm. It is.

  Moreover, the negative electrode 2nd extension part 163 is extended in the opposite direction to the positive electrode 2nd extension part 123 mentioned above. This negative electrode 2nd extension part 163 is about 1 mm in thickness (length in the left-right direction in FIGS. 1-3), and length (FIGS. 1-3) except the convex part 165 mentioned later. Middle, length in the arrangement direction H) is about 10 mm. The negative electrode second extending portion 163 is formed with a convex portion 165 that protrudes in a direction away from the case 111 and extends in the arrangement direction H to the tip of the negative electrode second extending portion 163. The projections 165 have an elongated shape when viewed from the protruding direction, and three are formed in parallel at a predetermined interval. Each protrusion 165 has a width of about 2 mm, a height of about 2 mm, and a length of about 7 mm.

  In the assembled battery 100, the unit cells 110 and 140 arranged adjacent to each other are configured such that the positive electrode terminal 120 of one unit cell 110 and the negative electrode terminal 160 of the other unit cell 140 are electrically connected to each other. Yes. Specifically, the positive electrode second extension portion 123 of the positive electrode terminal 120 and the negative electrode second extension portion 163 of the negative electrode terminal 160 overlap, and three receiving portions 125 provided in the positive electrode second extension portion 123 are overlapped. Each receiving part 125 and the convex part 165 are joined by welding in a state where the three convex parts 165 provided on the negative electrode second extension part 163 are fitted (see FIG. 3). This welded portion is formed along the arrangement direction H at a portion where the receiving portion 125 and the convex portion 165 are fitted. In the state where the positive electrode second extension portion 123 and the negative electrode second extension portion 163 overlap each other, the positive electrode second extension portion 123 is away from the case 111, and the negative electrode second extension portion 163 is on the case 111 side. To position.

Next, a method for manufacturing the assembled battery 100 will be described.
First, the cells 110 and 140 are manufactured by a known laminate cell manufacturing method. The positive electrode terminals 120 and 150 may be formed by preparing a metal plate having a predetermined shape, providing three notches serving as the receiving portions 125 by punching or the like, and further performing bending. The negative electrode terminals 130 and 160 may be formed by preparing a metal plate having a predetermined shape, providing three convex portions 165 with a press or the like, and further performing bending.

  In addition, the positive electrode terminal 120 (150) comprises the positive electrode 1st extension part 121 and the positive electrode 2nd extension part 123 which comprise this by a separate member, respectively, and forms the positive electrode terminal 120 (150) by welding. You may do it. Similarly, also in the negative electrode terminal 130 (160), the negative electrode first extending portion 161 and the negative electrode second extending portion 163 constituting the negative electrode terminal 130 (160) are formed of separate members, and the negative electrode terminal 130 (160) is formed by welding. You may make it do.

  Next, in the alignment step, the cells 110 and 140 are arranged next to each other, and the convex portion of the negative electrode terminal 160 of the other unit cell 140 adjacent to the receiving portion 125 of the positive electrode terminal 120 of the one unit cell 110 is arranged. While fitting the portion 165, the positive electrode second extending portion 123 provided with the receiving portion 125 and the negative electrode second extending portion 163 provided with the convex portion 165 are overlapped to align them.

At this time, since the receiving portion 125 of the positive electrode terminal 120 and the convex portion 165 of the negative electrode terminal 160 are fitted, the positioning of the positive electrode terminal 120 and the negative electrode terminal 160 is easy.
Moreover, each receiving part 125 and the convex part 165 are formed along the arrangement direction H as described above. For this reason, the positive electrode terminal 120 and the negative electrode terminal 160 are in a state perpendicular to the arrangement direction H (the positive electrode terminal 120 and the negative electrode terminal 130 are in a state where the receiving portion 125 and the convex portion 165 are fitted. While movement in the terminal arrangement direction L and the vertical direction in FIGS. 1 to 3 is restricted, movement in the arrangement direction H is possible. Therefore, the positive electrode terminal 120 and the negative electrode terminal 160 can be accurately positioned in the direction orthogonal to the arrangement direction H, and the positioning tolerance is increased in the arrangement direction H. As described above, when the positioning tolerance in the arrangement direction H is large, the dimensional tolerance in the arrangement direction H of the individual cells 110 and 140 can be absorbed by changing the interval between the positive electrode terminal 120 and the negative electrode terminal 160. .

  Next, in the welding process, a laser beam, an electron beam, or the like is irradiated from the negative electrode second extension portion 163 side, and the received receiving portion 125 and the convex portion 165 are welded along the arrangement direction H, respectively.

  In this welding, since the receiving part 125 and the convex part 165 are welded from the negative electrode second extension part 163 side, welding is performed only on the negative electrode second extension part 163 side, that is, upward in FIGS. It is sufficient to secure this space, and no large space is required on the positive electrode second extending portion 123 side. Therefore, even if the arrangement interval between the single cells 110 and 140 is reduced and the positive electrode terminal 120 and the negative electrode terminal 160 are reduced, a space for welding can be easily secured.

  Moreover, in this welding process, in the state which piled up the positive electrode 2nd extension part 123 and the negative electrode 2nd extension part 163, it received from the negative electrode 2nd extension part 163 side (FIG. 1-3 upper part). Since 165 and the convex part 125 are welded, it can suppress that the spatter | spatter at the time of welding scatters to the positive electrode 2nd extension part 123 side. Therefore, it is possible to prevent the single cells 110 and 140 from being damaged by sputtering. In particular, since the single cells 110 and 140 are laminate cells as described above, they are easily damaged by sputtering, and thus the yield can be effectively improved by suppressing sputtering.

  In the first embodiment, as described above, the convex portion 165 has an elongated shape when viewed from the protruding direction. And in a welding process, since the fitting receiving part 125 and the convex part 165 are welded along the arrangement direction H, the welding distance of the receiving part 125 and the convex part 165 becomes long. Accordingly, the bonding strength between the positive electrode terminal 120 and the negative electrode terminal 160 is increased. Moreover, the electrical resistance in the welded portion is reduced. In particular, in the first embodiment, since the receiving portion 125 and the three convex portions 165 are formed and welded to each other, the bonding strength between the positive electrode terminal 120 and the negative electrode terminal 160 is increased, Resistance becomes smaller.

  After the cells 110 and 140 are connected to each other by the welding process, an assembled member 100 (not shown) is assembled by a known method to complete the assembled battery 100.

(Embodiment 2)
Next, a second embodiment will be described. Note that the description of the same parts as those in the first embodiment is omitted or simplified. FIG. 4 shows a state where one set of unit cells 210 and 240 are arranged adjacent to each other and electrically connected in the assembled battery 200 according to the second embodiment. FIG. 5 shows a part of the positive electrode terminal 220 and the negative electrode terminal 260. Further, FIG. 6 shows a state in which the positive electrode terminal 220 and the negative electrode terminal 260 are connected.

  In the assembled battery 200 of the second embodiment, the unit cells 210 and 240 are electrically connected to each other via the terminal connection member 270, and the unit cells 110 and 140 are directly connected to each other. Different from the assembled battery 100 of FIG. The forms of the positive electrode terminals 220 and 250 and the negative electrode terminals 230 and 260 are also different from the positive electrode terminals 120 and 150 and the negative electrode terminals 130 and 160 of the first embodiment. Other than that, it is substantially the same as the first embodiment.

Each of the single cells 210 and 240 constituting the assembled battery 200 has positive electrode terminals (second electrode terminals) 220 and 250 and negative electrode terminals (first electrode terminals) 230 and 260.
The positive electrode terminal 220 of one unit cell 210 includes a plate-like positive electrode first extension 221 extending from one end side (upward in FIG. 4) of the unit cell 210, and the positive electrode first extension 221. It has a plate-like positive electrode second extension portion (terminal side second receiving joint portion) 223 that is bent at a right angle at the tip portion and extends in the arrangement direction H of the cells 210 and 240. The positive electrode second extending portion 223 is formed with a first receiving portion (terminal-side second receiving portion) 225 formed of an elongated notch extending in the arrangement direction H to the tip of the positive electrode second extending portion 223. The two first receiving portions 225 are formed in parallel at a predetermined interval.

  Further, the negative electrode terminal 260 of the other unit cell 240 includes a plate-like negative electrode first extension portion 261 extending from one end side (upward in FIG. 4) of the unit cell 240, and the negative electrode first extension portion. And a plate-like negative electrode second extending portion (terminal-side first receiving joint portion) 263 that is bent at a right angle at the tip portion of the H.261 and extends in the arrangement direction H. The negative electrode second extending portion 263 is formed with a second receiving portion (terminal-side first receiving portion) 265 made of an elongated notch extending in the arrangement direction H to the tip of the negative electrode second extending portion 263. The second receiving portion 265 is formed in parallel with a predetermined interval.

  Next, the terminal connection member 270 will be described. The terminal connecting member 270 is made of metal and extends in a plate shape in a direction opposite to the member first extending portion (member-side second convex joint portion) 271 extending in a plate shape and the member first extending portion 271. It has the member 2nd extension part (member side 1st convex junction part) 273, and the member intermediate part 275 located between the member 1st extension part 271 and the member 2nd extension part 273. The member first extending portion 271 and the member second extending portion 273 are each about 1 mm in thickness and width (left and right in FIGS. 4 to 6), excluding the first protruding portion 277 and the second protruding portion 279 described later. The length in the direction is about 10 mm, and the length (the length in the arrangement direction H in FIGS. 4 to 6) is about 10 mm.

  The member first extending portion 271 is formed with a first convex portion (member-side second convex portion) 277 extending in the arrangement direction H to the tip of the member first extending portion 271. The first protrusions 277 have an elongated shape when viewed from the protruding direction, and two are formed in parallel at a predetermined interval. The member second extending portion 273 is formed with a second convex portion (member-side first convex portion) 279 extending in the arrangement direction H to the tip of the member second extending portion 273. The second convex portion 279 also has an elongated shape when viewed from the protruding direction, and two are formed in parallel at a predetermined interval. The first convex portion 277 and the second convex portion 279 are separated from the case of the unit cells 210 and 240 when the terminal connecting member 270 is overlapped on the positive electrode terminal 220 and the negative second electrode terminal 260 (FIG. 4 to FIG. 4). It protrudes upward in FIG. The 1st convex part 277 and the 2nd convex part 279 are about 2 mm in width, about 1 mm in height, and about 4 mm in length, respectively.

  In the assembled battery 200, the unit cells 210 and 240 arranged adjacent to each other include a positive electrode terminal 220 of one unit cell 210 and a negative electrode terminal 260 of the other unit cell 240 via a terminal connection member 270. Electrically connected. Specifically, the positive first extension portion 223 of the positive electrode terminal 220 and the member first extension portion 271 of the terminal connection member 270 overlap with each other, and two first receiving portions provided in the positive second extension portion 223 are provided. The first receiving portion 225 and the first convex portion 277 are joined by welding in a state where the first convex portion 277 provided on the member 225 and the member first extending portion 271 are fitted. (See FIG. 6). This welded portion is formed along the arrangement direction H at a portion where the first receiving portion 225 and the first convex portion 277 are fitted. In addition, in a state where the positive electrode second extension portion 223 and the member first extension portion 271 overlap, the positive electrode second extension portion 223 is located on the side away from the case, and the member first extension portion 271 is located on the case side. .

  Also, the negative electrode second extension 263 of the negative electrode terminal 260 and the member second extension 273 of the terminal connection member 270 overlap with each other, and two second receiving portions 265 provided on the negative electrode second extension 263, In a state where the two second convex portions 279 provided on the member second extending portion 273 are fitted, each second receiving portion 265 and the second convex portion 279 are joined by welding. This welded portion is also formed along the arrangement direction H at a portion where the second receiving portion 265 and the second convex portion 279 are fitted. In addition, in a state where the negative electrode second extension portion 263 and the member second extension portion 273 overlap, the negative electrode second extension portion 263 is located on the side away from the case, and the member second extension portion 273 is located on the case side. .

Next, a method for manufacturing the assembled battery 200 will be described.
First, the single cells 210 and 240 are manufactured by a known laminate cell manufacturing method. Moreover, the terminal connection member 270 manufactured by well-known methods, such as press molding, is prepared.

  Then, in the alignment step, the single cells 210 and 240 are arranged adjacent to each other, and the first receiving portion 225 of the positive electrode terminal 220 of one of the single cells 210 and the first convex portion 277 of the terminal connection member 270 are fitted. The positive electrode 2nd extending part 223 provided with the 1st receiving part 225 and the member 1st extending part 271 provided with the 1st convex part 277 are piled up and aligning these, combining. Along with this, the second receiving portion 265 is provided while fitting the second receiving portion 265 of the negative electrode terminal 260 of the other unit cell 240 adjacent thereto and the second convex portion 279 of the terminal connecting member 270. Further, the negative electrode second extending portion 263 and the member second extending portion 273 provided with the second convex portion 279 are overlapped to align them.

  At this time, since the first receiving portion 225 of the positive electrode terminal 220 and the first convex portion 277 of the terminal connection member 270 are fitted, the positioning of the positive electrode terminal 220 and the terminal connection member 270 is easy. Moreover, since the 2nd receiving part 265 of the negative electrode terminal 260 and the 2nd convex part 279 of the terminal connection member 270 are fitting, positioning with the negative electrode terminal 260 and the terminal connection member 270 is also easy.

  In addition, each first receiving portion 225 and first convex portion 277 are formed along the arrangement direction H as described above. For this reason, the positive electrode terminal 220 and the terminal connection member 270 are restricted from moving in the direction orthogonal to the arrangement direction H in a state where the first receiving portion 225 and the first convex portion 277 are fitted. The movement in the arrangement direction H is possible. Therefore, the positive electrode terminal 220 and the terminal connection member 270 can be accurately positioned in the direction orthogonal to the arrangement direction, and the positioning tolerance is increased in the arrangement direction H. When the positioning tolerance in the arrangement direction H is large as described above, the dimensional tolerance in the arrangement direction H of the individual cells 210 and 240 can be absorbed by changing the interval between the positive electrode terminal 220 and the terminal connection member 270. .

  Each of the second receiving portions 265 and the second convex portions 279 is also formed along the arrangement direction H as described above. For this reason, the negative electrode terminal 260 and the terminal connecting member 270 are restricted from moving in a direction orthogonal to the arrangement direction H in a state where the second receiving portion 265 and the second convex portion 279 are fitted. The movement in the arrangement direction H is possible. Therefore, the negative electrode terminal 260 and the terminal connection member 270 can be accurately positioned in the direction orthogonal to the arrangement direction H, and the positioning tolerance is increased in the arrangement direction H. When the positioning tolerance in the arrangement direction H is large as described above, the dimensional tolerance in the arrangement direction of the individual cells 210 and 240 can be absorbed by changing the interval between the negative electrode terminal 260 and the terminal connection member 270.

  Next, in the welding step, a laser or electron beam is irradiated from the positive electrode second extending portion 223 side, and the fitted first receiving portion 225 and the first convex portion 277 are welded along the arrangement direction H, respectively. Further, a laser beam or an electron beam is irradiated from the negative electrode second extending portion 263 side, and the fitted second receiving portion 265 and second convex portion 279 are welded along the arrangement direction H, respectively.

  In this welding, the first receiving portion 225 and the first convex portion 277 are welded from the positive electrode second extending portion 223 side, and the second receiving portion 265 and the second convex portion 279 are welded from the negative electrode second extending portion 263 side. Therefore, it is sufficient to secure a space for welding only on the positive electrode second extending portion 223 side and the negative electrode second extending portion 263 side, that is, in the upper side in FIGS. Therefore, even if the arrangement interval between the single cells 210 and 240 is reduced and the positive electrode terminal 220, the negative electrode terminal 260, and the terminal connection member 270 are reduced, a space for welding can be easily secured.

  Further, in this welding process, the positive electrode second extending portion 223 and the member first extending portion 271 are stacked, and the negative electrode second extending portion 263 and the member second extending portion 273 are stacked. While welding the 1st receiving part 225 and the 1st convex part 277 from the 2nd extension part 223 side, the 2nd receiving part 265 and the 2nd convex part 279 are welded from the negative electrode 2nd extension part 263 side. For this reason, the spatter | spatter at the time of welding is hard to scatter to the member 1st extension part 271 and the member 2nd extension part 273 side. Therefore, it is possible to prevent the single cells 210 and 240 from being damaged by sputtering.

  In the second embodiment, as described above, the first convex portion 277 and the second convex portion 279 are elongated when viewed from the protruding direction. In the welding process, the fitted first receiving portion 225 and the first convex portion 277 and the fitted second receiving portion 265 and the second convex portion 279 are welded along the arrangement direction H, respectively. The welding distance between the first receiving portion 225 and the first convex portion 277, and the second receiving portion 265 and the second convex portion 279 is increased. Accordingly, the bonding strengths of the positive electrode terminal 220 and the terminal connection member 270, and the negative electrode terminal 260 and the terminal connection member 270 are increased. Moreover, the electrical resistance in the welded portion is reduced.

  After the unit cells 210 and 240 are connected to each other by the welding process, the assembled battery 200 is completed by assembling an exterior member (not shown) by a known method. In addition, the same part as the said Embodiment 1 has the same effect.

(Embodiment 3)
Next, a third embodiment will be described. Note that description of the same parts as those in the first or second embodiment is omitted or simplified. FIG. 7 shows a state where one set of single cells 310 and 340 are arranged adjacent to each other and electrically connected in the assembled battery 300 according to the third embodiment. FIG. 8 shows a part of the positive electrode terminal 320 and the negative electrode terminal 360. Further, FIG. 9 shows a state in which the positive electrode terminal 320 and the negative electrode terminal 360 are connected. In the assembled battery 300 according to the third embodiment, the positive electrode terminals 320 and 350, the negative electrode terminals 330 and 360, and the terminal connection member 370 have the positive electrode terminals 220 and 250 and the negative electrode terminals according to the second embodiment. 230 and 260 and the terminal connection member 270. Other than that, it is substantially the same as the second embodiment.

Each of the single cells 310 and 340 constituting the assembled battery 300 has positive electrode terminals (second electrode terminals) 320 and 350 and negative electrode terminals (first electrode terminals) 330 and 360.
The positive electrode terminal 320 of one unit cell 310 includes a plate-like positive electrode first extension 321 extending from one end side (upward in FIG. 7) of the unit cell 310, and the positive electrode first extension 321. It has a plate-like positive electrode second extension part (terminal side second convex joint part) 323 which is bent at a right angle at the tip part and extends in the arrangement direction H of the cells 310 and 340. The positive electrode second extension 323 is formed with a first protrusion (terminal-side second protrusion) 325 that protrudes in a direction away from the case and extends in the arrangement direction H to the tip of the positive electrode second extension 323. Has been. The first protrusions 325 have an elongated shape when viewed from the protruding direction, and two are formed in parallel at a predetermined interval.

  Further, the negative electrode terminal 360 of the other unit cell 340 includes a plate-like first negative extension 361 extending from one end side (upward in FIG. 7) of the single cell 340 and the negative first extension part. And a plate-like negative electrode second extension portion (terminal-side first convex joint portion) 363 that is bent at a right angle at the tip portion of 361 and extends in the arrangement direction H. The negative electrode second extension 363 is formed with a second protrusion (terminal-side first protrusion) 365 that protrudes in the direction away from the case and extends in the arrangement direction H to the tip of the negative electrode second extension 363. Has been. The second convex portion 365 has an elongated shape when viewed from the protruding direction, and two are formed in parallel at a predetermined interval.

  Next, the terminal connection member 370 will be described. The terminal connecting member 370 includes a member first extending portion (member-side second receiving joint portion) 371 extending in a plate shape and a member second extending in a plate shape in a direction opposite to the member first extending portion 371. It has an exit part (member-side first receiving joint part) 373 and a member intermediate part 375 positioned between the member first extension part 371 and the member second extension part 373.

  The member first extending portion 371 is formed with a first receiving portion (member-side second receiving portion) 377 formed of an elongated notch extending in the arrangement direction H to the tip of the member first extending portion 371. Two first receiving portions 377 are formed in parallel at a predetermined interval. The member second extending portion 373 is formed with a second receiving portion (member-side first receiving portion) 379 extending in the arrangement direction H to the tip of the member second extending portion 373. The second receiving portion 379 is also formed in parallel at a predetermined interval.

  In the assembled battery 300, the single cells 310 and 340 arranged adjacent to each other include a positive electrode terminal 320 of one single cell 310 and a negative electrode terminal 360 of the other single cell 340 via a terminal connection member 370. Electrically connected. Specifically, the positive electrode second extending portion 323 of the positive electrode terminal 320 and the member first extending portion 371 of the terminal connection member 370 overlap with each other, and the two first protrusions provided on the positive electrode second extending portion 323. Each first convex portion 325 and the first receiving portion 377 are joined by welding in a state where the portion 325 and the two first receiving portions 377 provided in the member first extending portion 371 are fitted. (See FIG. 9). This welded portion is formed along the arrangement direction H at a portion where the first convex portion 325 and the first receiving portion 377 are fitted. In addition, in a state where the positive electrode second extending portion 323 and the member first extending portion 371 overlap, the positive electrode second extending portion 323 is positioned on the case side, and the member first extending portion 371 is positioned on the side away from the case. .

  Further, the negative electrode second extension 363 of the negative electrode terminal 360 and the member second extension 373 of the terminal connection member 370 overlap with each other, and two second convex portions 365 provided on the negative electrode second extension 363, and In a state where the two second receiving portions 379 provided on the member second extending portion 373 are fitted, the respective second convex portions 365 and the second receiving portions 379 are joined by welding. This welded portion is also formed along the arrangement direction H at a portion where the second convex portion 375 and the second receiving portion 379 are fitted. In addition, in a state where the negative electrode second extending portion 363 and the member second extending portion 373 overlap each other, the negative electrode second extending portion 363 is positioned on the case side, and the member second extending portion 373 is positioned on the side away from the case. .

  Such an assembled battery 300 can be manufactured in substantially the same manner as the assembled battery 200 of the second embodiment. In the alignment step, the same effects as those of the second embodiment are achieved, such as positioning of the positive electrode terminal 320 and the terminal connection member 370 and positioning of the negative electrode terminal 360 and the terminal connection member 370 are easy. Obtainable. In the welding process, the same effects as those of the second embodiment can be obtained, for example, it is possible to prevent the single cells 310 and 340 from being damaged by sputtering.

(Embodiment 4)
Next, a fourth embodiment will be described. In addition, description of the part similar to either of the said Embodiments 1-3 is abbreviate | omitted or simplified. FIG. 10 shows a state where one set of single cells 410 and 440 are arranged adjacent to each other and electrically connected in the assembled battery 400 according to the fourth embodiment. FIG. 11 shows a part of the positive electrode terminal 420 and the negative electrode terminal 460. Further, FIG. 12 shows a state where the positive electrode terminal 420 and the negative electrode terminal 460 are connected. In the assembled battery 400 of the fourth embodiment, the terminal connection member 470 is different from the terminal connection members 270 and 370 of the second and third embodiments. Other than that, it is substantially the same as the second or third embodiment.

Each of the single cells 410 and 440 constituting the assembled battery 400 includes positive electrode terminals (second electrode terminals) 420 and 450 and negative electrode terminals (first electrode terminals) 430 and 460.
The positive electrode terminal 420 of one unit cell 410 has a plate-like positive electrode first extension 421 extending from one end side (upward in FIG. 10) of the unit cell 410, and the positive electrode first extension 421. It has a plate-like positive electrode second extension portion (terminal side second receiving joint portion) 423 that is bent at a right angle at the tip portion and extends in the arrangement direction H of the cells 410 and 440. Similarly to the second embodiment, two first receiving portions (terminal-side second receiving portions) 425 are formed in the positive electrode second extending portion 423.

  The negative electrode terminal 460 of the other unit cell 440 includes a plate-like first negative extension 461 extending from one end side (upward in FIG. 10) of the single cell 440 and the negative first extension part. And a plate-like negative electrode second extending portion (terminal-side first convex joint portion) 463 that is bent at a right angle at the tip portion of 461 and extends in the arrangement direction H. In the negative electrode second extending portion 463, two second convex portions (terminal-side first convex portions) 465 are formed as in the third embodiment.

  Next, the terminal connection member 470 will be described. The terminal connecting member 470 includes a member first extending portion (member-side second convex joint portion) 471 extending in a plate shape and a member second extending extending in a plate shape in a direction opposite to the member first extending portion 471. It has an exit part (member-side first receiving joint part) 473 and a member intermediate part 475 located between the member first extension part 471 and the member second extension part 473.

  The member first extending portion 471 is formed with a first convex portion (member-side second convex portion) 477 extending in the arrangement direction H to the tip of the member first extending portion 471. The first protrusions 477 have an elongated shape when viewed from the protruding direction, and two are formed in parallel at a predetermined interval. The member second extending portion 473 is formed with a second receiving portion (member-side first receiving portion) 479 extending in the arrangement direction H to the tip of the member second extending portion 473. The second receiving portion 479 is also formed in parallel with a predetermined interval.

  In the assembled battery 400, the unit cells 410 and 440 arranged adjacent to each other include a positive electrode terminal 420 of one unit cell 410 and a negative electrode terminal 460 of the other unit cell 440 via a terminal connection member 470. Electrically connected. Specifically, the positive first extension portion 423 of the positive electrode terminal 420 and the member first extension portion 471 of the terminal connection member 470 overlap with each other, and two first receiving portions provided in the positive second extension portion 423 are provided. The first receiving portion 425 and the first convex portion 477 are joined by welding in a state where the first convex portion 477 provided on the member 425 and the member first extending portion 471 are fitted. (See FIG. 12). This welded portion is formed along the arrangement direction H at a portion where the first receiving portion 425 and the first receiving portion 477 are fitted. In addition, in a state where the positive electrode second extension portion 423 and the member first extension portion 471 overlap, the positive electrode second extension portion 423 is located on the side away from the case, and the member first extension portion 471 is located on the case side. .

  Further, the negative electrode second extending portion 463 of the negative electrode terminal 460 and the member second extending portion 473 of the terminal connection member 470 overlap with each other, and two second convex portions 465 provided on the negative electrode second extending portion 463, In a state where the two second receiving portions 479 provided in the member second extending portion 473 are fitted, the respective second convex portions 465 and the second receiving portions 479 are joined by welding. This welded portion is also formed along the arrangement direction H at a portion where the second convex portion 465 and the second receiving portion 479 are fitted. In addition, in a state where the negative electrode second extending portion 463 and the member second extending portion 473 overlap each other, the negative electrode second extending portion 463 is positioned on the case side, and the member second extending portion 473 is positioned on the side away from the case. .

  Such an assembled battery 400 can also be manufactured in substantially the same manner as the assembled batteries 200 and 300 of the second and third embodiments. In the alignment step, the same effects as in the second or third embodiment, such as easy positioning of the positive electrode terminal 420 and the terminal connection member 470 and easy positioning of the negative electrode terminal 460 and the terminal connection member 470, etc. Can be obtained. Also in the welding process, the same effects as those of the second or third embodiment can be obtained, for example, it is possible to prevent the single cells 410 and 440 from being damaged by sputtering.

In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first to fourth embodiments, and can be appropriately modified and applied without departing from the gist thereof. Not too long.
For example, in Embodiments 1 to 4 described above, the cells 110, 140 and the like are connected in series, but the present invention can also be applied when the cells are connected in parallel.
The material and shape of the case are not limited to the laminated resin film, and the present invention can be applied to, for example, a rectangular metal case.

It is explanatory drawing which shows a mode that the battery of 1 set was arrange | positioned adjacent to each other and electrically connected regarding the battery pack concerning Embodiment 1. FIG. It is explanatory drawing which concerns on Embodiment 1 and shows the form of a part of positive electrode terminal and negative electrode terminal which are mutually connected. It is explanatory drawing which shows a mode that it concerns on Embodiment 1 and the positive electrode terminal and the negative electrode terminal were connected. It is explanatory drawing which shows a mode that one set of cell was arrange | positioned adjacent to each other and electrically connected regarding the assembled battery which concerns on Embodiment 2. FIG. It is explanatory drawing which concerns on Embodiment 2 and shows the form of a part of positive electrode terminal and negative electrode terminal which are mutually connected. It is explanatory drawing which shows a mode that it concerns on Embodiment 2 and connected the positive electrode terminal and the negative electrode terminal. It is explanatory drawing which shows a mode that one set of cell is arrange | positioned adjacent to each other and electrically connected regarding the assembled battery which concerns on Embodiment 3. FIG. It is explanatory drawing which concerns on Embodiment 3 and shows the form of a part of positive electrode terminal and negative electrode terminal which are mutually connected. It is explanatory drawing which shows a mode that it concerns on Embodiment 3 and connected the positive electrode terminal and the negative electrode terminal. It is explanatory drawing which shows a mode that one set of cell is arrange | positioned adjacent to each other and electrically connected regarding the assembled battery which concerns on Embodiment 4. FIG. It is explanatory drawing which concerns on Embodiment 4 and shows the form of a part of positive electrode terminal and negative electrode terminal which are mutually connected. It is explanatory drawing which shows a mode that it concerns on Embodiment 4 and connected the positive electrode terminal and the negative electrode terminal. It is explanatory drawing which shows a mode that the battery of 1 set is arrange | positioned adjacent to each other and electrically connected regarding the battery pack which concerns on the prior art 1. FIG. It is explanatory drawing which shows a mode that one set of cell was arrange | positioned adjacent to each other and electrically connected regarding the assembled battery which concerns on the prior art 2. FIG. It is explanatory drawing which shows a mode that the battery of 1 set was arrange | positioned adjacent to each other and electrically connected regarding the battery pack which concerns on the prior art 3. FIG.

Explanation of symbols

100, 200, 300, 400 Battery pack 110, 210, 310, 410 Cell 140, 240, 340, 440 Cell 111 Case 120, 220, 320, 420 Positive electrode terminal (second electrode terminal)
123 Positive electrode second extension (receiving joint)
223, 423 positive electrode second extension (terminal-side second receiving joint)
323 positive electrode second extension part (terminal side second convex joint part)
125 receiving parts 225, 425 first receiving part (terminal side second receiving part)
325 1st convex part (terminal side 2nd convex part)
130, 230, 330, 430 Negative electrode terminal (first electrode terminal)
150, 250, 350, 450 Positive electrode terminal (second electrode terminal)
160, 260, 360, 460 Negative electrode terminal (first electrode terminal)
163 Negative electrode second extension (convex joint)
263 Negative electrode second extension part (terminal side first receiving joint part)
363,463 Negative electrode second extension (terminal side first convex joint)
165 Convex portion 265 Second receiving portion (terminal side first receiving portion)
365, 465 Second convex part (terminal side first convex part)
270, 370, 470 Terminal connecting members 271, 471 Member first extending portion (member side second convex joint portion)
371 member first extension part (member side second receiving joint part)
273 member second extension part (member side first convex joint part)
373,473 Member second extending portion (member side first receiving joint portion)
277, 477 First convex part (member side second convex part)
377 1st receiving part (member side 2nd receiving part)
279 Second convex portion (member side first convex portion)
379, 479 Second receiving portion (member side first receiving portion)
H (between single cells) arrangement direction L terminal arrangement direction

Claims (12)

A battery comprising a first electrode terminal and a second electrode terminal projecting from a case, wherein the battery is configured to be electrically connected to other batteries disposed adjacent to each other,
The first electrode terminal includes a convex joint having a convex part,
The second electrode terminal is a receiving joint portion that overlaps the convex joint portion of the first electrode terminal in another battery when the other battery is arranged next to each other, and is a through hole that fits into the convex portion. Alternatively, a battery including a receiving joint portion having a receiving portion made of a notch. The battery according to claim 1,
The convex part is a battery having an elongated shape when viewed from the protruding direction. The battery according to claim 1 or 2,
The first electrode terminal and the second electrode terminal are:
In a state where the convex joint portion of the first electrode terminal for one battery and the receiving joint portion of the second electrode terminal for the other battery are overlapped, and the convex portion and the receiving portion are fitted. ,
A battery configured to restrict movement in a direction perpendicular to the arrangement direction of the batteries while allowing movement in the arrangement direction. The battery according to any one of claims 1 to 3,
A battery in which a plurality of convex portions and receiving portions are formed. It is a battery as described in any one of Claims 1-4, Comprising:
The case is made of a laminated resin film,
The battery in which the receiving joint portion is positioned farther from the case than the convex joint portion in a state where the convex joint portion and the receiving joint portion are overlapped. A plurality of batteries each having a first electrode terminal and a second electrode terminal are provided, and at least one set of batteries arranged next to each other, the first electrode terminal of one battery and the second electrode of the other battery A method of manufacturing an assembled battery in which terminals are electrically connected,
The first electrode terminal includes a convex joint having a convex part,
The second electrode terminal is a receiving joint portion that overlaps with the convex joint portion of another battery when the batteries are arranged next to each other, and has a receiving portion that includes a through hole or a notch that fits the convex portion. Having a receiving joint with
Positions where the batteries are arranged next to each other, and the convex joint part of one battery and the receiving part of the other battery are fitted together, and the convex joint part and the receiving joint part are overlapped to align them. Combining process,
After the said alignment process, the welding process which welds the said convex part and the said receiving part from the said receiving joint part side, The manufacturing method of an assembled battery provided with. A battery comprising a first electrode terminal and a second electrode terminal protruding from a case, and configured to be electrically connected to another battery arranged adjacent to each other via a terminal connection member,
The first electrode terminal is
A through-hole that fits into the member-side first convex portion when the member-side first convex joint portion of the terminal connecting member having the member-side first convex portion is overlapped with the member-side first convex portion. A terminal-side first receiving joint having a terminal-side first receiving portion made of a notch, or
When the member side first receiving joint portion of the terminal connecting member is provided with a member side first receiving joint portion having a member side first receiving portion formed of a through hole or a notch, the member side first receiving portion is overlapped. A terminal-side first convex joint portion having a terminal-side first convex portion to be fitted with,
The second electrode terminal is
A through-hole that fits into the member-side second convex portion when superimposed on the member-side second convex joint portion of the terminal connecting member having a member-side second convex joint portion having a member-side second convex portion or A terminal-side second receiving joint having a terminal-side second receiving portion made of a notch, or
When the member side second receiving joint portion of the terminal connecting member is provided with a member side second receiving joint portion having a member side second receiving portion formed of a through hole or a notch, the member side second receiving portion is overlapped. A battery provided with a terminal-side second convex joint having a terminal-side second convex part to be fitted. The battery according to claim 7,
A battery in which at least one of the terminal-side first convex portion and the terminal-side second convex portion is formed in an elongated shape when viewed from its protruding direction. The battery according to claim 7 or 8, wherein
The first electrode terminal is
In a state where the terminal connection member is overlapped and the member side first convex portion is fitted to the terminal side first receiving portion, or the terminal side first convex portion is fitted to the member side first receiving portion. In the state
While restricting movement in the direction perpendicular to the direction of arrangement with the other battery, it is configured to allow movement in the direction of arrangement,
The second electrode terminal is
The terminal connection member is overlapped and the terminal side second convex portion is fitted to the terminal side second receiving portion, or the terminal side second convex portion is fitted to the member side second receiving portion. In the state
A battery that is configured to allow movement in the arrangement direction while restricting movement in a direction orthogonal to the arrangement direction. It is a battery as described in any one of Claims 7-9, Comprising:
A battery in which a plurality of the terminal-side first receiving portions or the terminal-side first convex portions, and the terminal-side second receiving portions or the terminal-side second convex portions are formed. It is a battery as described in any one of Claims 7-10, Comprising:
The case is made of a laminated resin film,
The terminal side first receiving joint portion is configured to be located farther from the case than the member side first convex joint portion in a state where the terminal connecting member is overlapped on the first electrode terminal, or ,
The terminal-side first convex joint portion is configured to be positioned closer to the case than the member-side first receiving joint portion in a state where the terminal connection member is overlapped with the first electrode terminal.
The terminal-side second receiving joint portion is configured to be positioned farther from the case than the member-side second convex joint portion in a state where the terminal connection member is overlapped on the second electrode terminal, or ,
The terminal-side second convex joint portion is configured to be positioned closer to the case side than the member-side second receiving joint portion in a state where the terminal connection member is overlapped with the second electrode terminal. A plurality of batteries each having a first electrode terminal and a second electrode terminal are provided, and at least one set of batteries arranged next to each other, the first electrode terminal of one battery and the second electrode of the other battery A method for producing an assembled battery in which terminals are electrically connected via a terminal connecting member,
The terminal connection member and the first electrode terminal are:
A terminal connecting member having a member-side first convex joint having a member-side first convex, and a terminal-side first receiving joint overlapping the member-side first convex joint, wherein the member-side first convex A first electrode terminal comprising a terminal-side first receiving joint portion having a terminal-side first receiving portion made of a through-hole or notch that fits into the portion, or
A terminal connection member including a member-side first receiving joint portion having a member-side first receiving portion formed of a through-hole or a notch, and a terminal-side first convex joint portion overlapping the member-side first receiving joint portion; A first electrode terminal including a terminal-side first convex joint portion having a terminal-side first convex portion fitted to the member-side first receiving portion;
The terminal connecting member and the second electrode terminal are:
A terminal connecting member having a member-side second convex joint having a member-side second convex, and a terminal-side second receiving joint overlapping the member-side second convex joint, wherein the member-side second convex A second electrode terminal provided with a terminal-side second receiving joint portion having a terminal-side second receiving portion consisting of a through hole or a notch that fits into the portion, or
A terminal connection member including a member-side second receiving joint portion having a member-side second receiving portion formed of a through hole or a notch, and a terminal-side second convex joint portion overlapping the member-side second receiving joint portion; A second electrode terminal including a terminal-side second convex joint portion having a terminal-side second convex portion fitted to the member-side second receiving portion,
While aligning the member-side first convex portion and the terminal-side first receiving portion, the member-side first convex joint portion and the terminal-side first receiving joint portion are overlapped to align them. Alternatively, the member-side first receiving joint and the terminal-side first convex joint are overlapped with each other while fitting the member-side first receiving part and the terminal-side first convex part. As well as
While aligning the member-side second convex portion and the terminal-side second receiving portion, the member-side second convex joint portion and the terminal-side second receiving joint portion are overlapped to align them. Alternatively, the member side second receiving joint portion and the terminal side second convex joint portion are overlapped with each other while the member side second receiving portion and the terminal side second convex portion are fitted. An alignment process to be performed;
After the positioning step, the member-side first convex portion and the terminal-side first receiving portion are welded from the terminal-side first receiving joint portion side, or the member-side first receiving joint portion side is connected to the member. Welding the side first receiving part and the terminal side first convex part,
The member side second convex portion and the terminal side second receiving portion are welded from the terminal side second receiving joint portion side, or the member side second receiving portion from the member side second receiving joint portion side. And a welding step of welding the terminal-side second convex portion.

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