JP2017126531A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a battery pack having a new configuration with less inconvenience.SOLUTION: A battery pack includes, for example, a case, a battery cell, and a first conductive member. The case has a first wall portion and a second wall portion which is located at a peripheral portion of the first wall portion and extends along a first direction intersecting with the first wall portion. The battery cell is housed in the case and has an electrode portion. The first conductive member has a first connecting portion which is exposed to the outer surface of the second wall portion and connectable to the outer conductor, and a second connecting portion for connecting the first connecting portion and the electrode portion to each other.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to an assembled battery.

  2. Description of the Related Art Conventionally, an assembled battery including a metal can type battery cell in which an electrode portion is provided on an upper wall portion and a holder that supports the battery cell is known.

JP 2011-91043 A

  In this type of assembled battery, for example, it is preferable if a new configuration with less inconvenience is obtained.

  The assembled battery according to the embodiment includes, for example, a case, a battery cell, and a first conductive member. The case includes a first wall portion and a second wall portion that is located at a peripheral portion of the first wall portion and extends along a first direction that intersects the first wall portion. The battery cell is accommodated in a case and has an electrode part. The first conductive member includes a first connection portion that is exposed on the outer surface of the second wall portion and can be connected to an external conductor, and a second connection portion that connects the first connection portion and the electrode portion. Have.

FIG. 1 is an exemplary perspective view of the battery pack according to the first embodiment. FIG. 2 is an exemplary exploded perspective view of the battery pack according to the first embodiment. FIG. 3 is an exemplary perspective view of the subassembly of the battery pack according to the first embodiment. FIG. 4 is an exemplary exploded perspective view of the subassembly of the battery pack according to the first embodiment. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an exemplary perspective view of a second conductive member of the battery pack according to the first embodiment. FIG. 7 is an exemplary perspective view of the subassembly of the battery pack according to the second embodiment. FIG. 8 is an exemplary exploded perspective view of the subassembly of the battery pack according to the second embodiment. FIG. 9 is an exemplary perspective view of the subassembly of the battery pack according to the third embodiment. FIG. 10 is an exemplary exploded perspective view of the subassembly of the battery pack according to the third embodiment. FIG. 11 is an exemplary perspective view of the subassembly of the assembled battery according to the fourth embodiment. FIG. 12 is an exemplary exploded perspective view of the subassembly of the assembled battery according to the fourth embodiment. FIG. 13 is an exemplary perspective view of the assembled battery of the fifth embodiment. FIG. 14 is an exemplary exploded perspective view of the assembled battery of the fifth embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Further, according to the present invention, at least one of various effects (including derivative effects) obtained by the configuration can be obtained.

  Moreover, the same component is contained in several embodiment disclosed below. Therefore, below, the same code | symbol is provided to those similar components, and the overlapping description is abbreviate | omitted. In the following drawings, directions are defined for convenience. The X direction is the thickness direction of the subassembly 10, the Y direction is the longitudinal direction of the subassembly 10, and the Z direction is the short direction of the subassembly 10. The X direction, the Y direction, and the Z direction are orthogonal to each other.

<First Embodiment>
As shown in FIGS. 1 and 2, the assembled battery 1 includes, for example, a plurality of subassemblies 10, a cover 4, a coupling member 5, and a second conductive member 8 as a conductive member. The subassembly 10 is configured in a flat rectangular parallelepiped shape that is thin in the X direction. The cover 4 covers the ends of the plurality of subassemblies 10 in the X direction (the lower right direction in FIGS. 1 and 2). The coupling member 5 integrates the plurality of subassemblies 10 in a state in which the plurality of subassemblies 10 and the cover 4 are arranged to overlap in the X direction. The second conductive member 8 is electrically connected to the battery cell 2 included in the plurality of subassemblies 10 and functions as an external connection terminal of the assembled battery 1. In the present embodiment, the X direction is an example of a first direction.

  The assembled battery 1 is installed in various devices, machines, facilities, and the like, and is used as a power source for these various devices, machines, and facilities. For example, the assembled battery 1 is used not only as a mobile power source such as a power source for an automobile or a bicycle (moving body) but also as a stationary power source such as a power source for a POS (Point Of Sales) system. Can be used. Moreover, it is also possible to mount a plurality of assembled batteries 1 shown in the present embodiment as a set connected in series or in parallel to various devices. Therefore, the assembled battery 1 can also be referred to as a battery module, a battery unit, or the like. In addition, the number, arrangement | positioning, etc. of the subassembly 10 contained in the assembled battery 1 are not limited to what is disclosed by this embodiment. Further, the assembled battery 1 may include wiring for monitoring the voltage and temperature of the battery cell 2, a monitoring board, a control board for battery control, and the like.

  As shown in FIG. 4, the case 3 included in the plurality of subassemblies 10 is configured in a rectangular parallelepiped box shape whose ends in the X direction (upward in FIG. 4) are opened. The case 3 has a plurality of wall portions 3a to 3e. As shown in FIGS. 1 and 2, the plurality of subassemblies 10 can be installed with the wall portions 3 a and 3 c of the case 3 in a posture along a plane, for example.

  Further, as shown in FIG. 2, a plurality of (for example, six) subassemblies 10 are arranged in a line along the X direction. In the present embodiment, one battery cell 2 is accommodated in each case 3 of each subassembly 10.

  The coupling member 5 includes, for example, a bolt 5a and a nut 5b. As shown in FIG. 1, in this embodiment, the nut 5 b meshes with the bolt 5 a that penetrates the case 3 and the cover 4 of each subassembly 10 in the X direction, so that the plurality of subassemblies 10 and the cover 4 are connected. Integrated.

  As shown in FIG. 4, the plurality of subassemblies 10 each include a battery cell 2, a case 3, a first conductive member 9 as a conductive member, a support member 15, and the like. The battery cell 2 is housed in the case 3 and covered. The battery cell 2 and the case 3 are integrated via a support member 15. That is, the battery cell 2 is supported by the case 3 via the support member 15. The first conductive member 9 is electrically connected to the battery cell 2 and the second conductive member 8.

  The battery cell 2 includes a housing 20 and a pair of electrode portions 25. One of the electrode portions 25 is a positive electrode portion 25A, and the other is a negative electrode portion 25B. As shown also in FIG. 3, in this embodiment, the electrode part 25 is couple | bonded with the 1st electrically-conductive member 9 by welding etc., for example.

  The first conductive member 9 includes, for example, a connection portion 9a and a connection portion 9b. The connection portion 9a is formed in a plate shape along the wall portions 3b and 3d of the case 3, and is exposed on the outer surface 3t of the wall portions 3b and 3d. Further, the connection portion 9 b is configured in a plate shape along the wall portion 3 e of the case 3, and connects the connection portion 9 a and the electrode portion 25. In the present embodiment, one connection portion 9 a of the pair of first conductive members 9 functions as the positive electrode terminal 23, and the other connection portion 9 a functions as the negative electrode terminal 24. The connection part 9a is an example of a first connection part, and the connection part 9b is an example of a second connection part. The connecting portion 9a can also be referred to as a terminal portion or the like.

  Moreover, as FIG. 1 shows, the positive electrode terminal 23 and the negative electrode terminal 24 are couple | bonded with the 2nd electrically-conductive member 8 by the coupling tools 11, such as a screw, for example. In the assembled battery 1, for example, the positive terminal 23 and the negative terminal 24 of two subassemblies 10 adjacent in the X direction are electrically connected via the second conductive member 8, and at both ends in the X direction. Electric power is taken out through a pair of output terminal portions 8g provided. In the present embodiment, the second conductive member 8 is an example of an outer conductor. The second conductive member 8 and the first conductive member 9 can be referred to as a bus bar. The second conductive member 8 can also be called a main bus bar, an outer bus bar, or the like, and the first conductive member 9 can also be called a sub bus bar, a relay bus bar, an intermediate bus bar, an inner bus bar, or the like.

  As shown in FIGS. 1 and 2, the cover 4 has a wall portion 4 a that expands in a direction orthogonal to the X direction, that is, in the Y direction and the Z direction. The wall 4a is configured in a rectangular plate shape that is horizontally long in the Y direction, for example. Moreover, the four corner | angular parts of the wall part 4a are provided with the opening part 4b (refer FIG. 2) which the volt | bolt 5a penetrates, respectively. The wall part 4a is an example of an insulating part. The cover 4 can be made of, for example, a synthetic resin material.

  Moreover, as FIG. 2-4 shows, the wall part 3e of case 3 is comprised by the rectangular plate shape along the wall part 4a, for example. The wall 3e can also be referred to as a bottom wall, a lower wall, a partition wall, or the like. The wall 3e is an example of an insulating part. As shown in FIG. 4, in the present embodiment, the walls 3a to 3d protrude from the peripheral edge of the wall 3e in the X direction (upward in FIG. 4). Thereby, the accommodating part 3r which accommodates the battery cell 2 is provided between wall part 3e and wall part 3a-3d. As shown in FIG. 2, in the battery pack 1, the battery cells 2 and the wall portions 3 e and 4 a are alternately stacked in the X direction. Each accommodating portion 3r of the case 3 is closed by wall portions 3e and 4a positioned in the X direction (right direction in FIG. 2). Wall part 3a-3d is mutually connected via the corner | angular part (boundary part), and each has the surface (outer surface, plane) which faced another direction. In the present embodiment, the wall 3e is an example of a first wall, and the walls 3a to 3d are examples of a second wall.

  Also, as shown in FIG. 4, the wall 3a and the wall 3c are both along the direction orthogonal to the Z direction, that is, along the X and Y directions, and are parallel to each other with an interval in the Z direction. Is provided. The wall 3b and the wall 3d are both along the direction orthogonal to the Y direction, that is, along the X and Z directions, and are provided in parallel to each other with an interval in the Y direction. As shown in FIG. 3, the wall portions 3b and 3d are opposed to or close to the electrode portion 25 of the battery cell 2 among the wall portions 3a to 3d, and the wall portions 3a and 3c are the wall portions 3a to 3d. Are separated from the electrode portion 25. The wall portions 3a to 3d may be referred to as side wall portions or the like.

  As shown in FIG. 3, boss portions 3h projecting in the X direction (upward in FIG. 3) are provided at the four corners of the wall portion 3e. As shown in FIG. 2, an opening 3i through which the bolt 5a passes is provided in the cylinder of the boss 3h. The length of the boss 3h in the X direction, that is, the protruding amount is configured to be substantially the same as or slightly smaller than the length of the walls 3a to 3d in the X direction.

  Further, as shown in FIG. 4, projecting portions 3 g projecting in the X direction (upward in FIG. 4) are provided at positions close to the four boss portions 3 h of the wall portion 3 e. . The protruding portion 3g is configured in a columnar shape along the opening 20r of the battery cell 2, for example. The movement along the wall 3e of the battery cell 2 is limited by the contact between the edge of the opening 20r and the protrusion 3g. In the present embodiment, the protruding portion 3g is an example of a first positioning portion, and the opening 20r is an example of a second positioning portion.

  The walls 3b and 3d are each provided with an opening 3j. The opening 3j is, for example, a notch that is open toward the X direction (upward in FIG. 4) of the walls 3b and 3d. A protrusion 15b of the support member 15 shown in FIG. 4 is inserted into the opening 3j. The movement of the support member 15 in the Z direction is restricted by the abutment between the protruding portion 15b and the edges of the opening 3j in the Z direction and the opposite direction of the Z direction. In the present embodiment, the protruding portion 15b is an example of a third positioning portion, and the opening 3j is an example of a fourth positioning portion.

  Moreover, the opening part 3k is provided in the both sides of the opening part 3j of wall part 3b, 3d, respectively. The opening 3k is, for example, a through hole that penetrates the walls 3b and 3d along the Y direction. In the present embodiment, a coupling tool 12 such as a screw is inserted into the opening 3 k and the opening 15 c of the support member 15.

  As shown in FIGS. 1 and 2, the plurality of cases 3 are arranged along the X direction in such a posture that the respective wall portions 3 e face the same direction, that is, the opposite direction of the X direction (upper left direction in FIGS. Are lined up. The plurality of cases 3 are arranged so that, for example, in the direction along the X direction, the positive terminals 23 exposed on the wall 3b and the negative terminals 24 exposed on the wall 3d are alternately arranged. The case 3 can be made of, for example, a synthetic resin material. Case 3 may also be referred to as a sub case, a unit case, a divided case, or the like. In the present embodiment, as shown in FIG. 1, a plurality of cases 3 included in each subassembly 10 constitute a case of the assembled battery 1 in a state where the plurality of subassemblies 10 are assembled.

  As illustrated in FIG. 4, the support member 15 includes, for example, a base portion 15a and a protruding portion 15b. As shown in FIG. 3, the base portion 15 a is configured in a vertically long rectangular parallelepiped shape in the Z direction, and is positioned between the wall portions 3 b and 3 d and the battery cell 2. Further, the surface of the base portion 15a facing the X direction (upward in FIG. 3) faces the connection portion 9b of the first conductive member 9, and supports the connection portion 9b. As shown in FIG. 4, a plurality of openings 15 c are provided on the surface of the base portion 15 a that faces the walls 3 b and 3 d at intervals in the Z direction. The opening 15c faces the opening 3k of the walls 3b and 3d. The support member 15 is coupled to the walls 3b and 3d by the coupler 12 inserted into the opening 3k and the opening 15c.

  As shown in FIG. 4, the protruding portion 15b protrudes from the substantially central portion in the Z direction of the base portion 15a toward the opening 3j of the wall portions 3b and 3d. The surface of the protruding portion 15b opposite to the base portion 15a faces the connecting portion 9a of the first conductive member 9, and supports the connecting portion 9a. Moreover, the opening part facing the opening part 9c of the connection part 9a and the opening part 8d (refer FIG. 6) of the 2nd electrically-conductive member 8 can be provided in the surface on the opposite side to the base part 15a of the protrusion part 15b. . The support member 15 can be coupled to the second conductive member 8 and the first conductive member 9 by a coupler 11 (see FIG. 1) inserted into the three openings 8d and 9c. The support member 15 and the first conductive member 9 may be integrated by, for example, insert molding. The support member 15 can be made of, for example, a synthetic resin material.

  As illustrated in FIG. 6, the second conductive member 8 includes, for example, a plurality of connection portions 8 a and 8 b and a bridge portion 8 c. The second conductive member 8 is configured, for example, by a single plate-like member bent at one place (bridge portion 8c). As shown in FIG. 1, the connection portions 8a and 8b are formed in a rectangular plate shape along the connection portion 9a and are spaced apart from each other in the X direction. The connection portions 8a and 8b are overlapped with the connection portion 9a from the opposite side of the connection portion 9a to the battery cell 2, that is, from the outside of the case 3. In addition, the connection portions 8a and 8b are provided with an opening portion 8d facing the opening portion 9c of the connection portion 9a. In the present embodiment, the connection portions 8a and 8b are an example of a third connection portion. The connecting portions 8a and 8b can also be referred to as terminal portions or the like.

  Further, as shown in FIG. 6, the bridge portion 8c is provided between the connection portion 8a and the connection portion 8b. The bridge portion 8c is bent in a convex state toward the inside of the case 3 from the connection portions 8a and 8b with a line of sight in the Z direction. That is, the cross section along the XY plane of the bridge portion 8 c is configured in a substantially U shape that is open toward the outside of the case 3. In the bridge portion 8c, for example, the gap 3x between the two connection portions 9a adjacent to each other in the X direction in a state where the second conductive member 8 and the first conductive member 9 are coupled to each other by the coupler 11 (see FIG. 1). According to this embodiment, since the bridge portion 8c is provided in the second conductive member 8, for example, when an external force such as an impact or vibration along the X direction is input to the assembled battery 1, or the second When the conductive member 8 is thermally deformed along the X direction, the stress can be relieved by the bridge portion 8c. In addition, compared to the case where the bridge portion 8c is bent toward the outside of the case 3, the assembled battery 1 can be configured to be smaller in the Y direction, or the space around the bridge portion 8c can be used more effectively. It can be. The bridge portion 8c can also be referred to as a bent portion, a protruding portion, a connecting portion, or the like.

  The battery cell 2 shown by FIG. 3 is comprised by the lithium ion secondary battery etc., for example. The battery cell 2 may be another secondary battery such as a nickel metal hydride battery or a nickel cadmium battery. A lithium ion secondary battery is a kind of non-aqueous electrolyte secondary battery, and lithium ions in the electrolyte are responsible for electrical conduction. Examples of the positive electrode material include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese cobalt composite oxide, spinel type lithium manganese nickel composite oxide, and olivine. A lithium phosphorus oxide having a structure is used, and as the negative electrode material, for example, an oxide material such as lithium titanate (LTO), an oxide material such as niobium composite oxide, or the like is used. Moreover, as electrolyte (for example, electrolyte solution), lithium salt, such as fluorine-type complex salt (for example, LiBF4, LiPF6), etc. were mix | blended, for example, ethylene carbonate, propylene carbonate, diethyl carbonate, ethyl methyl carbonate, dimethyl carbonate, etc. An organic solvent or the like may be used alone or in combination. The battery cell 2 can also be referred to as a single battery or the like.

  As shown in FIG. 4, the housing 20 of the battery cell 2 is configured in a flat rectangular parallelepiped shape that is thin in the X direction. Moreover, the housing | casing 20 has several wall part 20a-20f. The wall portion 20e and the wall portion 20f are both along the direction orthogonal to the X direction, that is, along the Y direction and the Z direction, and are provided in parallel to each other with an interval in the X direction. One of the walls 20e and 20f may be referred to as a bottom wall or a lower wall, and the other may be referred to as a top wall or an upper wall. As shown in FIG. 3, the wall portion 20 f faces the wall portion 3 e of the case 3 and is supported by the wall portion 3 e. Moreover, the wall parts 20a-20d are located in the peripheral part of the wall part 20e, and span between the said wall part 20e and the wall part 20f. In the present embodiment, the wall portion 20f is an example of a third wall portion, the wall portion 20e is an example of a fourth wall portion, and the wall portions 20a to 20d are examples of a fifth wall portion. is there.

  Moreover, both the wall part 20a and the wall part 20c are along the direction orthogonal to the Z direction, that is, the X direction and the Y direction, and are provided in parallel to each other with an interval in the Z direction. Further, both the wall portion 20b and the wall portion 20d are substantially along the direction intersecting the Y direction, that is, the X direction and the Z direction, and are provided at intervals in the Y direction. The wall portions 20a to 20d may be referred to as side wall portions or the like. The wall portions 20a and 20c are examples of long side portions of the side wall portions, and the wall portions 20b and 20d are examples of short side portions of the side wall portions.

  Further, as shown in FIG. 4, for example, the walls 20 b and 20 d are configured in a substantially trapezoidal shape protruding in a protruding state in the Y direction or the opposite direction of the Y direction, in the line of sight in the X direction. In this embodiment, wall part 20b, 20d has inclined part 20b1, 20d1, and connection part 20b2, 20d2. The inclined portions 20b1 and 20d1 protrude toward the outside of the case 3 from the end portions of the wall portion 20e in the Y direction or in the direction opposite to the Y direction. As shown in FIG. 5, the inclined portions 20b1 and 20d1 intersect the wall portions 20e and 20f and the X direction. Specifically, the inclined portions 20b1 and 20d1 are inclined so as to gradually approach the wall portion 20f from the end portion on the wall portion 20e side toward the end portion on the opposite side to the wall portion 20e. In the line of sight of FIG. 5, the angles at which the walls 20e, 20f and the inclined portions 20b1, 20d1 intersect, and the angles at which the X direction and the inclined portions 20b1, 20d1 intersect are acute angles of 1 ° or more and less than 90 °, respectively.

  Further, the connecting portions 20b2 and 20d2 connect the end portion of the inclined portions 20b1 and 20d1 opposite to the wall portion 20e and the wall portion 20f. The connecting portions 20b2 and 20d2 are substantially perpendicular to the wall portions 20e and 20f. Also, as shown in FIG. 4, the thicknesses of the connecting portions 20b2 and 20d2 along the X direction gradually decrease from the respective end portions in the Z direction and the opposite direction of the Z direction toward the central portion. ing. That is, the areas of the inclined portions 20b1 and 20d1 are gradually increased from the respective end portions in the Z direction and the opposite direction of the Z direction toward the central portion. In this embodiment, the electrode part 25 is provided in the approximate center part of the inclination parts 20b1 and 20d1 in the Z direction, that is, the largest part of the inclination parts 20b1 and 20d1.

  Further, as shown in FIG. 5, the wall portion 20f includes, for example, a base portion 20f1 and a flange portion 20f2. The base portion 20f1 is configured in a rectangular plate shape along the wall portions 20a to 20d shown in FIG. 4 and covers an open portion of the wall portions 20a to 20d opposite to the wall portion 20e. Further, the flange portion 20f2 projects from the base portion 20f1 to the outside of the housing 20 along the wall portion 3e. The flange portion 20f2 is provided with a plurality of openings 20r that are positioned with the above-described protrusion 3g on the case 3 side. The flange portion 20f2 can also be referred to as a protruding portion or an overhang portion.

  Further, a flange portion 20p that protrudes to the outside of the housing 20 along the flange portion 20f2 is provided on the opposite side to the wall portion 20e of the wall portions 20a to 20d, that is, on the end portion on the wall portion 20f side. As shown in FIG. 5, in the present embodiment, the flange portion 20p and the flange portion 20f2 are coupled to each other by, for example, resistance seam welding. Resistance seam welding has advantages in that airtightness, heat resistance, and the like are likely to be higher and costs are lower than laser welding. The flange portion 20p can also be referred to as a protruding portion, an overhang portion, or the like.

  Moreover, the housing | casing 20 is comprised by combining several components (divided body). Specifically, the housing 20 includes, for example, a first housing member 21 (case, first case) and a second housing member 22 (lid, cover, second case). As shown in FIG. 4, the first housing member 21 has at least wall portions 20 a to 20 e and a flange portion 20 p. The second housing member 22 has at least a wall portion 20f. The first housing member 21 is configured in a rectangular parallelepiped box shape with one end side opened. The second housing member 22 is configured in a substantially rectangular plate shape that is horizontally long in the Y direction. The second housing member 22 closes the opened portion of the first housing member 21 and is integrated with the first housing member 21 by resistance seam welding or the like. The first housing member 21 and the second housing member 22 are made of, for example, stainless steel.

  As shown in FIG. 5, the electrode unit 25 includes, for example, a head portion 25a, a shaft portion 25b, and the like. The head 25a has a substantially trapezoidal shape that protrudes outward in the thickness direction of the inclined portions 20b1 and 20d1 in the line of sight of FIG. Specifically, the head 25a includes a first surface 25a1 along the walls 20e and 20f, a second surface 25a2 along the connecting portions 20b2 and 20d2, and a third surface along the inclined portions 20b1 and 20d1. Surface 25a3, 25a4. The third surface 25a3 connects the end portion of the first surface 25a1 opposite to the inclined portions 20b1, 20d1 and the end portion of the second surface 25a2 opposite to the inclined portions 20b1, 20d1, The width along the inclined portions 20b1 and 20d1 is narrower than the third surface 25a4. The first surface 25a1 faces the connecting portion 9b of the first conductive member 9 shown in FIG. In the present embodiment, for example, the first surface 25a1 and the edge of the opening 9d of the connection portion 9b are coupled to each other by laser welding or the like. Thereby, the electrode portion 25 and the first conductive member 9 are mechanically connected and electrically connected.

  Further, as shown in FIG. 5, the shaft portion 25b is formed in a columnar shape extending along the thickness direction of the inclined portions 20b1 and 20d1. The shaft portion 25b passes through the opening 20s provided in the inclined portions 20b1 and 20d1. The electrode portion 25 is coupled to the housing 20 by, for example, fixing the end portion of the shaft portion 25b opposite to the head portion 25a by caulking. The electrode part 25 can be comprised with electroconductive materials, such as aluminum, for example.

  A seal member 18 is provided between the electrode portion 25 and the edge of the opening 20s. The seal member 18 is made of an insulating material such as a synthetic resin material or glass. The seal member 18 seals the space between the electrode portion 25 and the edge of the opening 20s in an airtight and liquid-tight manner and is electrically insulated. The seal member 18 can also be referred to as a gasket or packing.

  Moreover, the electrode body 26, electrolyte solution, etc. are accommodated in the inside of the housing | casing 20, for example. The electrode body 26 includes, for example, a positive electrode sheet, a negative electrode sheet, and an insulating layer (separator). The electrode body 26 may be formed in a flat shape by winding a positive electrode sheet, a negative electrode sheet, and an insulating layer. The electrode body 26 is an electrode group and functions as a power generation element. Moreover, the negative electrode part 25B of the electrode part 25 is electrically connected to the negative electrode sheet of the electrode body 26 via a plurality of conductive members 27 to 29, and the positive electrode part 25A is connected to the negative electrode sheet 25 via the plurality of conductive members 27 to 29. The electrode body 26 is electrically connected to the positive electrode sheet. The conductive member 27 can also be referred to as a negative electrode backup lead, a positive electrode backup lead, or the like. The conductive member 28 may also be referred to as a first negative electrode lead, a first positive electrode lead, or the like, and the conductive member 29 may be referred to as a second negative electrode lead, a second positive electrode lead, or the like.

  Here, in this embodiment, the depth of the X direction of the accommodating part 3r (refer FIG. 4) in each subassembly 10 is set shorter than the thickness of the X direction of the housing | casing 20. FIG. Therefore, as shown in FIG. 1, the wall portions 3 a to 3 d and the cover 4 of each case 3 are pushed in the X direction by the fastening force of the coupling member 5 in a state where the housing 20 is housed in each housing portion 3 r. By being combined, the wall portions 20e and 20f (see FIG. 5) of the housing 20 are elastically deformed in a direction approaching each other. In the present embodiment, the electrode body 26 is supported in the X direction by using a force (elastic force) associated with the elastic deformation of the wall portions 20e and 20f. That is, the swelling in the X direction of the electrode body 26 is suppressed by the force accompanying the elastic deformation of the wall portions 20e and 20f. Therefore, according to the present embodiment, for example, the electrode body 26 is more likely to be suppressed from expanding in the X direction than the initial state, and as a result, the degradation of the performance of the battery cell 2 caused by the expansion of the electrode body 26 can be suppressed. . Moreover, in this embodiment, since the housing | casing 20 is comprised by stainless steel, compared with a metal can type battery cell, the housing | casing 20 becomes easy to elastically deform, and by extension, the battery cell 2 to the X direction is extended. A compressed state can be obtained relatively easily.

  As described above, in the present embodiment, for example, the assembled battery 1 includes the wall portion 3e (first wall portion) and the X direction (first wall) positioned on the peripheral portion of the wall portion 3e and intersecting with the wall portion 3e. The wall 3a-3d (second wall) extending along the direction 3), the battery cell 2 housed in the case 3 and having the electrode 25, and the walls 3a-3. A connecting portion 9a (first connecting portion) exposed to the outer surface 3t of 3d and connectable to the second conductive member 8 (external conductor), and a connecting portion 9b (second connecting portion) connected to the electrode portion 25 And a first conductive member 9 having Therefore, according to the present embodiment, for example, in the configuration in which the battery cell 2 is accommodated in the case 3 by the first conductive member 9, the connection portion 9a that can be connected to the second conductive member 8 outside the case 3 is provided. The assembled battery 1 can be realized. Further, since the battery cell 2 is accommodated in the case 3, for example, the case 3 makes it easy to ensure the rigidity and strength of the subassembly 10, and thus the assembled battery 1. Therefore, for example, compared to a conventional metal can type battery cell, the housing 20 of the battery cell 2 can be made of a softer material, or the thickness of the wall portions 20a to 20f of the housing 20 can be made thinner. Yes. Therefore, for example, the battery cell 2 can be easily configured to be lighter, and as a result, the subassembly 10 (the assembled battery 1) including the battery cell 2 and the case 3 can be configured to be lighter. In addition, although the case where the battery cell 2 and the case 3 are configured in a rectangular parallelepiped shape is illustrated in the present embodiment, the present invention is not limited thereto, and may be configured in a cylindrical shape that is flat in the X direction, for example.

  In the present embodiment, for example, the case 3 includes a plurality of wall portions 3 a to 3 d, and the wall portions 3 b and 3 d among the plurality of wall portions 3 a to 3 d face the electrode portion 25, and the electrode portion A connecting portion 9 a is provided on the wall portions 3 b and 3 d facing 25. Therefore, according to the present embodiment, for example, the first conductive member 9 (connecting portion 9b) can be configured to be shorter than the case where the connecting portion 9a is provided on the wall portions 3a and 3c. The labor and cost required for manufacturing the battery 1 can be reduced, and the electrical resistance between the second conductive member 8 and the electrode portion 25 can be reduced.

  In the present embodiment, for example, the battery cell 2 is positioned along the wall portion 3e and separated from the wall portion 20f (third wall portion) supported by the wall portion 3e in the X direction. The wall portion 20e (fourth wall portion) extending along the wall portion 20f and the wall portion 20f and the inclined portions 20b1 and 20d1 intersecting with the X direction are provided between the wall portion 20f and the wall portion 20e. Wall portions 20a to 20d (fifth wall portions) positioned on the electrode portions 25, and the electrode portions 25 are provided on the inclined portions 20b1 and 20d1. Therefore, according to the present embodiment, for example, the installation area of the electrode unit 25 is easily increased as compared with the configuration in which the electrode unit 25 is provided on the wall unit perpendicular to the wall unit 20f. Therefore, for example, the shaft portion 25b penetrating the opening 20s of the inclined portions 20b1 and 20d1 can be configured to be thicker, and as a result, a large current (high rate current) can flow through the electrode portion 25. Further, for example, the distance between the electrode portion 25 and the current collecting tab (conductive member 27) of the electrode body 26 is shorter than that of a conventional metal can type battery cell in which the electrode portion 25 is provided on the upper wall portion. As a result, the number of parts for electrically connecting the electrode portion 25 and the electrode body 26 may be reduced, and the electrical resistance may be reduced.

  In the present embodiment, for example, the assembled battery 1 includes the case 3, the battery cell 2, and the first conductive member 9, and is adjacent to the plurality of subassemblies 10 arranged in the X direction. The second conductive member 8 (external conductor) connecting the one connection portion 9a and the other connection portion 9a of the two subassemblies 10 is provided. Therefore, according to the present embodiment, for example, a plurality of subassemblies 10 arranged along the X direction are relatively easily connected via the second conductive member 8, and a series circuit of the plurality of battery cells 2 is formed. It can be configured relatively easily.

  In the present embodiment, for example, the second conductive member 8 (outer conductor) is separated from each other in the X direction and is connected to each of the connection portions 9a (a third connection portion). And a bridge portion 8c that crosses between the two connection portions 8a and 8b while being bent from the connection portions 8a and 8b toward the inside of the case 3. Therefore, according to the present embodiment, for example, when an external force such as an impact or vibration along the X direction is input to the assembled battery 1, or when the second conductive member 8 is thermally deformed along the X direction, etc. In addition, the stress can be relieved by the bridge portion 8c. In addition, compared to the case where the bridge portion 8c is bent toward the outside of the case 3, the assembled battery 1 can be configured to be smaller in the Y direction, or the space around the bridge portion 8c can be used more effectively. It can be.

  In the present embodiment, for example, the wall 3e (first wall) is provided with a protrusion 3g (first positioning portion) extending along the X direction, and the wall 20f (third wall) is provided. Part) is provided with an opening 20r (second positioning part) that restricts movement along the wall part 3e of the battery cell 2 by contact with the protruding part 3g. Therefore, according to the present embodiment, for example, the subassembly 10 in which the battery cell 2 and the case 3 are integrated by positioning the protrusion 3g and the opening 20r can be more easily, more smoothly, or more It can be obtained quickly. In the present embodiment, the protrusion 3g is provided on the wall 3e, and the opening 20r is provided on the wall 20f. However, the opening 20r is provided on the wall 3e, and the protrusion 3g is provided on the wall 20f. It may be provided. Further, the second positioning portion is not limited to the opening 20r, and may be, for example, a stepped portion, a notch portion, or the like.

  In the present embodiment, for example, the assembled battery 1 includes a case 3 and a battery cell 2, each of which includes a plurality of subassemblies 10 arranged in the X direction and a coupling member that integrates the plurality of subassemblies 10. 5 is provided. Therefore, according to the present embodiment, for example, the plurality of subassemblies 10 are easily integrated with a relatively simple configuration by the bolts 5a and the nuts 5b of the coupling member 5, and as a result, labor and time required for manufacturing the assembled battery 1 are reduced. Costs can be reduced.

Second Embodiment
The assembled battery 1A of the embodiment shown in FIGS. 7 and 8 has the same configuration as the assembled battery 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, in the present embodiment, for example, as shown in FIG. 8, the point that the concave portion 3y that accommodates the battery cell 2 is provided in the wall portion 3e of each subassembly 10A is different from the above-described embodiment. . Specifically, in each case 3A, the recess 3y is recessed from the wall 3e in the X direction (the lower right direction in FIGS. 7 and 8) and is opened toward the opposite direction of the X direction. The battery cell 2 is accommodated in the recess 3y with the wall 20e facing the bottom of the recess 3y. Moreover, the bottom part and peripheral part of the recessed part 3y are comprised in the shape along the wall part 20e and wall part 20a-20d of the battery cell 2, for example. Thereby, in this embodiment, the movement along the wall part 3e of the battery cell 2 can be restrict | limited by contact | abutting with the wall parts 20a-20d and the peripheral part of the recessed part 3y. Thus, according to this embodiment, since the recess 3y is provided in the case 3A, for example, the positioning portion of the above embodiment, that is, the protruding portion 3g and the opening 20r (see FIG. 4) are not required. As a result, the positioning operation between the battery cell 2 and the case 3A can be performed more easily, more smoothly, or more quickly.

  As shown in FIG. 8, an opening 3u through which the electrode portion 25 of the battery cell 2 is exposed is provided at the bottom of the recess 3y. In the present embodiment, for example, in a state where the electrode part 25 is accommodated in the opening 3u, the electrode part 25 and the edge part of the opening 9d of the first conductive member 9 are coupled to each other by laser welding or the like. Thereby, the electrode portion 25 and the first conductive member 9 are mechanically connected and electrically connected. Furthermore, in the present embodiment, the walls 3b and 3d of the case 3A are provided with openings 3n in which the connection portions 9b of the first conductive member 9 are accommodated. The opening 3n is, for example, a notch that is opened toward the X direction (the lower right direction in FIGS. 7 and 8) of the walls 3b and 3d. The movement of the first conductive member 9 in the Z direction is restricted by the contact between the connecting portion 9b and the respective edges of the opening 3n in the Z direction and in the opposite direction of the Z direction. Moreover, the connection part 9a of the 1st electrically-conductive member 9 overlaps with the outer surface 3t of wall part 3b, 3d. The opening 9c of the connecting portion 9a faces the opening 8d (see FIG. 6) of the second conductive member 8. The second conductive member 8 and the first conductive member 9 are coupled to the wall portions 3b and 3d by, for example, the couplers 11 (see FIG. 1) penetrating the respective openings 8d and 9c and the wall portions 3b and 3d. Can be done. Thus, in this embodiment, since the opening 3n that restricts the movement of the first conductive member 9 in the Z direction is provided in the case 3A, for example, the support member 15 of the above embodiment (see FIG. 3). ) May be unnecessary, and as a result, labor and cost required for manufacturing the assembled battery 1A may be easily reduced.

<Third Embodiment>
The assembled battery 1B of the embodiment shown in FIGS. 9 and 10 has the same configuration as the assembled battery 1A of the second embodiment. Therefore, according to this embodiment, the same result (effect) based on the same configuration as that of the second embodiment can be obtained.

  However, in this embodiment, for example, as shown in FIG. 9, the positive terminal 23 and the negative terminal 24 of each subassembly 10B, that is, the two connection portions 9a are exposed on the outer surface 3t of one wall portion 3c. The point is different from the above embodiment. In the present embodiment, the case 3A and the first conductive member 9A are integrated by, for example, insert molding. Thereby, the connection part 9a of 9 A of 1st electrically-conductive members is exposed to the outer surface 3t of the wall part 3c in the state which each penetrated the opening part 3v of the wall part 3c. The opening 9c of the connecting portion 9a faces the opening 8d (see FIG. 6) of the second conductive member 8. The second conductive member 8 and the first conductive member 9A can be coupled to the wall portion 3c by, for example, a coupling tool 11 (see FIG. 1) penetrating the respective openings 8d and 9c and the wall portion 3c. Further, the connecting portion 9b of the first conductive member 9A and the electrode portion 25 are in contact with each other through the opening 3u of the case 3A shown in FIG. 10, and are electrically and mechanically connected by laser welding or the like. .

  As described above, in the present embodiment, for example, the case 3A includes a plurality of wall portions 3a to 3d, the battery cell 2 includes the positive electrode portion 25A and the negative electrode portion 25B as the electrode portion 25, and includes a plurality of wall portions. The connecting portion 9a of the first conductive member 9A having the connecting portion 9b connected to the positive electrode portion 25A on the wall portion 3c as one of the portions 3a to 3d, and the connecting portion connected to the negative electrode portion 25B And a connecting portion 9a of the first conductive member 9A having 9b. Therefore, according to the present embodiment, for example, the second conductive member is compared with the case where the two connection portions 9a of each subassembly 10B, that is, the positive electrode terminal 23 and the negative electrode terminal 24 are provided on different wall portions, respectively. 8 and the first conductive member 9A may be more easily, smoothly, or more quickly connected.

<Fourth embodiment>
The assembled battery 1C of the embodiment shown in FIGS. 11 and 12 has the same configuration as the assembled battery 1A of the second embodiment. Therefore, according to this embodiment, the same result (effect) based on the same configuration as that of the second embodiment can be obtained.

  However, in the present embodiment, for example, as shown in FIG. 12, the first conductive member 9B of each subassembly 10C has a plurality of connection portions 9a, which is different from the above-described embodiment. Yes. Specifically, in each subassembly 10C, the pair of first conductive members 9B includes a connection portion 9a exposed on the outer surface 3t of the wall portions 3b and 3d shown in FIG. 11 and an outer surface 3t of the wall portion 3c. And a connection portion 9a exposed on the outer surface 3t of the wall portion 3a. In the present embodiment, the case 3A and the first conductive member 9B are integrated by, for example, insert molding. Thereby, the three connection portions 9a of the first conductive member 9B are exposed to the outer surface 3t in a state of penetrating through the respective opening portions 3v of the wall portions 3b and 3d, the wall portion 3c, and the wall portion 3a. In the present embodiment, the second conductive member 8 and the first conductive member 9B align the opening 9c and the opening 8d of the arbitrary connecting portion 9a selected from the three connecting portions 9a described above. The case 3A can be coupled by the coupler 11 (see FIG. 1) penetrating each of the openings 9c and 8d and the walls 3a to 3d. Further, the connection portion 9b of the first conductive member 9B and the electrode portion 25 are in contact with each other through the opening 3u of the case 3A shown in FIG. 12, and are electrically and mechanically connected by laser welding or the like. . In addition, the connection part 9a which was not selected is covered with a cover member etc. which are not illustrated.

  As described above, in the present embodiment, for example, the first conductive member 9B having the connection portion 9b connected to the positive electrode portion 25A on the wall portion 3c as one of the plurality of wall portions 3a to 3d. The connecting portion 9a and the connecting portion 9a of the first conductive member 9B having the connecting portion 9b connected to the negative electrode portion 25B are provided, and the wall portion as another one of the plurality of wall portions 3a to 3d 3a and the wall portions 3b and 3d, a first conductive member 9B having a connection portion 9b having a connection portion 9b connected to the positive electrode portion 25A, and a first connection portion having a connection portion 9b connected to the negative electrode portion 25B. And a connecting portion 9a of the conductive member 9B. Therefore, according to the present embodiment, for example, the plurality of connection portions 9a facilitates an increase in the degree of freedom of arrangement of the second conductive member 8 (external conductor) in the assembled battery 1C. In the present embodiment, the case where each of the pair of first conductive members 9B includes a plurality of connection portions 9a is illustrated, but the present invention is not limited to this. For example, among the pair of first conductive members 9B Only one side may have a plurality of connection portions 9a.

<Fifth Embodiment>
The assembled battery 1D of the embodiment shown in FIGS. 13 and 14 has the same configuration as the assembled battery 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

  However, in the present embodiment, for example, as illustrated in FIG. 13, the assembled battery 1 </ b> D is different from the above-described embodiment in that the battery pack 1 </ b> D includes a substrate 30 in which the second conductive member 8 is integrated. The substrate 30 is configured in a rectangular plate shape facing the six wall portions 3b and 3d arranged in the X direction. The substrate 30 includes a first surface 30a (see FIG. 14) facing the walls 3b and 3d and a second surface 30b (see FIG. 13) facing the opposite side of the walls 3b and 3d. Have. As shown in FIG. 14, the second conductive member 8 is exposed on the first surface 30a. Further, the substrate 30 may be provided with an opening facing the opening 8 d of the second conductive member 8 and the opening 9 c of the first conductive member 9. The board | substrate 30 can be couple | bonded with wall part 3b, 3d by the coupling tool 11 which penetrates these three opening part 8d, 9c and wall part 3b, 3d. The board 30 can be referred to as a circuit board, a control board, or the like. The board | substrate 30 can monitor the voltage, temperature, etc. of the battery cell 2, or can perform battery control, for example. The substrate 30 is an example of a first substrate. Therefore, according to the present embodiment, for example, by the substrate 30 in which the second conductive member 8 is integrated, the connection work between the first conductive member 9 and the second conductive member 8, and thus the substrate 30, is further improved. It will be easier or faster to do. Therefore, for example, the labor required for manufacturing the assembled battery 1D may be further reduced.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

  DESCRIPTION OF SYMBOLS 1,1A-1D ... Assembly battery, 2 ... Battery cell, 3, 3A ... Case, 3a, 3c ... Wall part (2nd part, 2nd wall part), 3b, 3d ... Wall part (1st part) , Second wall), 3e ... wall (first wall), 3t ... outer surface, 8 ... second conductive member (external conductor), 8a, 8b ... connection (third connection), 8c ... Bridge part, 9, 9A, 9B ... First conductive member, 9a ... Connection part (first connection part), 9b ... Connection part (second connection part), 10 ... Subassembly, 20a-20d ... Wall part (fifth wall part), 20b1, 20d1 ... inclined part, 20e ... wall part (fourth wall part), 20f ... wall part (third wall part), 25 ... electrode part, 25A ... positive electrode part 25B ... negative electrode part, 30 ... substrate (first substrate), X ... first direction.

Claims (9)

A case having a first wall portion, and a second wall portion that is located at a peripheral portion of the first wall portion and extends along a first direction intersecting the first wall portion;
A battery cell housed in the case and having an electrode part;
A first connection member having a first connection part exposed to the outer surface of the second wall part and connectable to an external conductor; and a second connection part connected to the electrode part;
A battery pack comprising The case has a plurality of the second walls,
At least one of the plurality of second wall portions faces the electrode portion,
The assembled battery according to claim 1, wherein the first connection portion is provided on the second wall portion facing the electrode portion. The case has a plurality of the second walls,
The battery cell includes a positive electrode part and a negative electrode part as the electrode part,
The first connection part of the first conductive member having the second connection part connected to the positive electrode part in one of the plurality of second wall parts, the negative electrode part, The assembled battery according to claim 1, further comprising: the first connection portion of the first conductive member having the connected second connection portion.   The first connection part of the first conductive member having the second connection part connected to the positive electrode part in another one of the plurality of second wall parts, and the negative electrode The assembled battery according to claim 3, wherein the first connection portion of the first conductive member having the second connection portion connected to a portion is provided. The case has a plurality of the second walls,
The first conductive member is provided on another one of the plurality of second wall portions and the first connection portion provided on one of the plurality of second wall portions. The assembled battery according to claim 1, further comprising: the first connection portion. The battery cell is
A third wall supported by the first wall along the first wall;
A fourth wall portion that is spaced apart from the third wall portion in the first direction and extends along the third wall portion;
A fifth wall portion having an inclined portion intersecting with the third wall portion and the first direction and positioned between the third wall portion and the fourth wall portion;
Have
The assembled battery according to claim 1, wherein the electrode part is provided in the inclined part. A plurality of subassemblies each having the case, the battery cell, and the first conductive member and arranged in the first direction;
The outer conductor connecting the first connection portion of one of the two subassemblies adjacent to each other in the first direction and the first connection portion of the other;
The assembled battery according to claim 1, comprising: The outer conductor is
A plurality of third connecting portions spaced apart from each other in the first direction and connected to each of the first connecting portions;
A bridge portion that crosses between the two third connection portions in a state bent from the third connection portion toward the inside of the case;
The assembled battery according to claim 7, comprising:   The assembled battery according to claim 7, comprising a first substrate on which the outer conductor is integrated.

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