JP2017084467A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack that enhances reliability to an impact even when external force acts.SOLUTION: A battery pack includes a battery group in which plural single batteries each having a flat type battery main body and an electrode tab led out to the outside from the battery main body are laminated in the thickness direction, and a heat radiation plate 170 is disposed at at least one place between the adjacent single batteries, an upper pressure plate and a lower pressure plate which cover the battery group from both sides in the lamination direction Z of the single batteries, and a pair of side plates 153 which intersect to the lamination direction and cover the battery group from both sides in a direction intersecting to the extension direction of the electrode tabs. The pair of side plates 153 are joined to the upper pressure plate and the lower pressure plate while the battery group is pressurized in the lamination direction by the upper pressure plate and the lower pressure plate, and a regulating portion 180 for regulating the movement of a heat radiation plate 170 in a planar direction XY in which the single batteries extend are formed between at least one side plate 153 of the pair of side plates 153 and the heat radiation plate 170.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an assembled battery.

  In recent years, in the automobile industry, secondary batteries and fuel cells have been mainly developed from the viewpoints of environmental protection and fuel efficiency. Since the output of each secondary battery is not so large, a desired number of secondary batteries are stacked to form an assembled battery in order to enable the car to continue. As a conventional technique related to an assembled battery, Patent Document 1 summarizes a cell subassembly in which a plurality of battery cells are stacked into one by a pressure plate and a strip.

Special table 2012-515418 gazette

  However, in Patent Document 1, the cell subassembly is maintained in a fixed state by a belt-like body having a width dimension smaller than that of the cell assembly. Therefore, the stacked secondary batteries cannot be sufficiently held, and depending on the magnitude of the external force, the cell assembly or the single battery may move from a direction orthogonal to the stacking direction, which may affect the battery performance.

  An object of this invention is to provide the assembled battery which improved the reliability with respect to an impact, even if external force acts.

  The present invention that achieves the above object is to stack a plurality of unit cells in the thickness direction including a battery main body including a power generation element and formed flat and an electrode tab derived from the battery main body, and between adjacent unit cells. A battery group in which a heat radiating plate that dissipates heat generated at the time of use of the unit cell is disposed in at least one of the battery, a pair of first cover members that cover the battery group from both sides in the unit cell stacking direction, and a crossing direction And a pair of second cover members that cover the battery group from both sides in the direction intersecting with the direction in which the electrode tab extends. The pair of second cover members are joined to the pair of first cover members in a state where the battery group is pressurized in the stacking direction by the pair of first cover members. Further, a restricting portion for restricting the movement of the heat radiating plate in the planar direction in which the unit cell extends is formed between at least one second cover member of the pair of second cover members and the heat radiating plate.

  According to the assembled battery of the present invention, the pair of second cover members are joined to the pair of first cover members in a state where the battery group is pressurized in the stacking direction by the pair of first cover members. In addition, a restricting portion that restricts the movement of the heat dissipation plate in the planar direction in which the unit cell extends is formed between at least one second cover member of the pair of second cover members and the heat dissipation plate. Therefore, the restriction of movement by the restricting portion can be exerted not only on the heat radiating plate but also on the battery group including the heat radiating plate. Therefore, even if an external force is input, the movement of the battery group or the like can be suppressed, and the reliability against impact can be improved.

It is a perspective view which shows the assembled battery which concerns on 1st Embodiment. 2A and 2B are a plan view and a side view showing the assembled battery of FIG. It is a perspective view which shows the state which exposed the whole laminated body of the state which decomposed | disassembled the upper pressure plate, the lower pressure plate, and the left and right side plates from the assembled battery shown in FIG. It is a perspective view which removes a protective cover from the laminated body shown by FIG. 2, and decomposes | disassembles a laminated body into a battery group and a bus bar unit. It is a perspective view which decomposes | disassembles and shows the bus bar unit shown by FIG. The state of joining the anode side electrode tabs of the first cell sub-assemblies (single cells connected in parallel every three sets) and the cathode side electrode tabs of the second cell sub-assies (unit cells connected in parallel every three sets) with a bus bar is schematically disassembled. It is a perspective view shown. FIG. 7A is a perspective view showing a state in which a pair of spacers (first spacer and second spacer) is attached to a single cell, and FIG. 7B shows a pair of spacers (first spacer and first spacer from the single cell). It is a perspective view which shows the state which removed (2 spacers). It is a perspective view which shows a pair of spacer (1st spacer and 2nd spacer). It is sectional drawing which follows the 9-9 line | wire of FIG. 2 (B). FIG. 10A is a perspective view showing a cross section of the main part in a state where the bus bar is joined to the electrode tabs of the stacked unit cells, and FIG. 10B is a side view showing FIG. 10A from the side. is there. It is a fragmentary sectional view shown about the heat sink and the side plate in the same position as FIG. 9 in the assembled battery concerning 2nd Embodiment. It is a fragmentary sectional view shown about the heat sink and the side plate in the same position as FIG. 9 in the assembled battery concerning 3rd Embodiment. It is a fragmentary sectional view shown about the heat sink, the side plate, the 1st spacer, and the 2nd spacer in the same position as FIG. 9 in the assembled battery concerning 4th Embodiment. It is a fragmentary sectional view which shows the modification of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The size and ratio of each member in the drawings are exaggerated for convenience of explanation and may be different from the actual size and ratio. In the figure, the azimuth is shown using arrows represented by X, Y, and Z. The direction of the arrow represented by X indicates a direction that intersects the stacking direction of the unit cells 110 and is along the longitudinal direction of the unit cells 110. The direction of the arrow represented by Y indicates a direction that intersects the stacking direction of the unit cells 110 and is along the short direction of the unit cells 110. The direction of the arrow represented by Z indicates the stacking direction of the unit cells 110.

(First embodiment)
First, the assembled battery 100 of 1st Embodiment is demonstrated, referring FIGS. 1-10.

  FIG. 1 is a perspective view showing an assembled battery 100 according to the first embodiment. 2A and 2B are a plan view and a side view showing the assembled battery of FIG. 3 shows a state in which the entire pressurization plate 151, the lower pressurization plate 152, and the left and right side plates 153 are disassembled from the assembled battery 100 shown in FIG. It is a perspective view. FIG. 4 is a perspective view in which the protective cover 140 is removed from the laminate 100S shown in FIG. 2 and the laminate 100S is disassembled into a battery group 100G and a bus bar unit 130.

  FIG. 5 is an exploded perspective view showing the bus bar unit 130 shown in FIG. FIG. 6 shows the anode side electrode tab 113A of the first cell sub-assembly 100M (unit cells 110 connected in parallel every three sets) and the cathode side electrode tab 113K of the second cell sub-assembly 100N (unit cells 110 connected in parallel every three sets). It is a perspective view which decomposes | disassembles and shows the state joined by the bus bar 131 typically.

  7A is a perspective view illustrating a state in which the pair of spacers 120 (the first spacer 121 and the second spacer 122) are attached to the single battery 110, and FIG. 7B is a pair of spacers 120 from the single battery 110. It is a perspective view which shows the state which removed (the 1st spacer 121 and the 2nd spacer 122). FIG. 8 is a perspective view showing a pair of spacers 120 (first spacer 121 and second spacer 122). FIG. 9 is a cross-sectional view taken along line 9-9 of FIG.

  FIG. 10A is a perspective view showing a cross-sectional view of a main part in a state where the bus bar 131 is joined to the electrode tab 113 of the stacked unit cell 110, and FIG. 10B shows FIG. 10A from the side. It is a side view.

  In the state shown in FIG. 1, the left front side is referred to as the entire assembled battery 100 and the “front side” of each component, and the right rear side is referred to as the entire assembled battery 100 and the “rear side” of each component. The front side and the back side of the left hand are referred to as the “left and right side sides” of the entire assembled battery 100 and each component.

  As shown in FIGS. 1 to 3, the battery pack 100 includes a battery group 100 </ b> G in which a plurality of flat cells 110 are stacked in the thickness direction and a heat dissipation plate 170 is disposed between the cells 110. 100S. The assembled battery 100 further includes a protective cover 140 that is attached to the front surface side of the stacked body 100S, and a housing 150 that houses the stacked body 100S in a state where each of the single cells 110 is pressurized along the stacking direction of the single cells 110. Have. As illustrated in FIG. 4, the stacked body 100 </ b> S includes a battery group 100 </ b> G and a bus bar unit 130 that is attached to the front side of the battery group 100 </ b> G and integrally holds a plurality of bus bars 131. The protective cover 140 covers and protects the bus bar unit 130. As shown in FIG. 5, the bus bar unit 130 includes a plurality of bus bars 131 and a bus bar holder 132 to which the plurality of bus bars 131 are integrally attached in a matrix. Among the plurality of bus bars 131, an anode side terminal 133 is attached to the end on the anode side, and a cathode side terminal 134 is attached to the end on the cathode side.

  The battery pack 100 according to the first embodiment, as outlined with reference to FIGS. 3, 9 and 10B, includes a battery body 110H including a power generation element 111 and formed flat, and electrodes derived from the battery body 110H. A plurality of unit cells 110 including tabs 113 are stacked in the thickness direction, and a heat radiating plate 170 that dissipates heat generated when the unit cells 110 are used is disposed at least at one location between adjacent unit cells 110. A battery group 100G, an upper pressure plate 151 and a lower pressure plate 152 (corresponding to a pair of first cover members) covering the battery group 100G from both sides in the stacking direction Z of the unit cells 110, intersecting the stacking direction Z, and A pair of side plates 153 (corresponding to a pair of second cover members) that cover the battery group 100G from both sides in a direction intersecting with the direction in which the electrode tab 113 extends. The group 100G is joined to the upper pressure plate 151 and the lower pressure plate 152 in a state where the group 100G is pressed in the stacking direction Z by the upper pressure plate 151 and the lower pressure plate 152, and at least one side plate 153 of the pair of side plates 153 and the heat radiating plate. A regulating portion 180 that regulates the movement of the heat radiating plate 170 in the planar direction XY in which the unit cell 110 extends is formed between them.

  As shown in FIG. 6, the battery group 100G includes a first cell sub-assembly 100M composed of three unit cells 110 electrically connected in parallel and a second cell sub-assembly 100N composed of three other unit cells 110 electrically connected in parallel. Are connected in series by a bus bar 131.

  The first cell sub-assembly 100M and the second cell sub-assembly 100N have the same configuration except for the refractive direction of the tip 113d of the electrode tab 113 of the unit cell 110. Specifically, the second cell sub-assembly 100N is obtained by reversing the top and bottom of the unit cell 110 included in the first cell sub-assembly 100M. However, the refraction direction of the tip portion 113d of the electrode tab 113 of the second cell sub-assembly 100N is aligned with the lower side of the stacking direction Z so as to be the same as the refraction direction of the tip portion 113d of the electrode tab 113 of the first cell sub-assembly 100M. ing. Each unit cell 110 has a pair of spacers 120 (first spacer 121 and second spacer 122) attached thereto.

  The unit cell 110 corresponds to, for example, a flat lithium ion secondary battery. As shown in FIGS. 10A and 10B, the unit cell 110 includes a battery body 110H in which the power generation element 111 is sealed with a pair of laminate films 112, and a battery that is electrically connected to the power generation element 111. And a thin plate-like electrode tab 113 led out from the main body 110H.

  The power generation element 111 is formed by laminating a plurality of layers in which a positive electrode and a negative electrode are sandwiched by separators. The power generation element 111 is supplied with electric power from the outside and charged, and then supplies electric power while discharging to an external electric device.

  The laminate film 112 is configured to cover both sides of the metal foil with an insulating sheet. The pair of laminate films 112 cover the power generation element 111 from both sides along the stacking direction Z and seal the four sides. As shown in FIGS. 7 (A) and 7 (B), the pair of laminate films 112 is formed of anode-side electrode tabs 113A and cathode-side electrodes from between one end portions 112a along the short-side direction Y toward the outside. The tab 113K is derived.

  As shown in FIGS. 7A, 7B, and 8, the laminate film 112 is provided with a first spacer in a pair of connecting holes 112e provided at both ends of the one end 112a along the short direction Y, respectively. A pair of connecting pins 121 i of 121 is inserted through each. On the other hand, the laminate film 112 has a pair of connecting pins 122i inserted through a pair of connecting holes 112e provided at both ends of the other end 112b along the short direction Y, respectively. The laminate film 112 is formed by bending both end portions 112c and 112d along the longitudinal direction X upward in the stacking direction Z.

  As shown in FIGS. 7A and 7B, the electrode tab 113 is composed of an anode-side electrode tab 113A and a cathode-side electrode tab 113K, and from between the one end portions 112a of the pair of laminate films 112, respectively. It extends toward the outside in a state of being separated from each other. The anode-side electrode tab 113A is made of aluminum in accordance with the characteristics of the anode-side component member in the power generation element 111. The cathode-side electrode tab 113K is made of copper in accordance with the characteristics of the cathode-side constituent member in the power generation element 111.

  As shown in FIG. 10B, the electrode tab 113 is formed in an L shape from the base end portion 113c adjacent to the battery body 110H to the tip end portion 113d. Specifically, the electrode tab 113 extends along one side in the longitudinal direction X from the base end portion 113c. On the other hand, the tip 113d of the electrode tab 113 is formed by being refracted along the lower side in the stacking direction Z. The shape of the tip portion 113d of the electrode tab 113 is not limited to the L shape. The tip portion 113 d of the electrode tab 113 is formed in a planar shape so as to face the bus bar 131. The electrode tab 113 may be formed in a U-shape by further extending the distal end portion 113d and folding the extended portion along the base end portion 113c toward the battery body 110H. On the other hand, the base end portion 113c of the electrode tab 113 may be formed in a wave shape or a curved shape.

  The tip portions 113d of the electrode tabs 113 are refracted to be aligned downward in the stacking direction Z as shown in FIGS. 10 (A) and 10 (B) in the unit cell 110 in which a plurality of electrode tabs 113 are stacked. Here, as shown in FIG. 6, the assembled battery 100 includes three unit cells 110 (first cell sub-assy 100M) electrically connected in parallel and another three unit cells 110 (second cell) electrically connected in parallel. Cell subassemblies 100N) are connected in series. Therefore, for each of the three unit cells 110, the top and bottom of the unit cell 110 are switched so that the positions of the anode side electrode tab 113A and the cathode side electrode tab 113K of the unit cell 110 intersect along the stacking direction Z. Yes.

  However, simply replacing the top and bottom for each of the three unit cells 110 causes the position of the tip 113d of the electrode tab 113 to vary in the vertical direction along the stacking direction Z. The light is adjusted and refracted so that the position of the tip 113d of 113 is aligned.

  In the first cell sub-assembly 100M shown in the lower part of FIG. 6, the anode side electrode tab 113A is arranged on the right side in the figure, and the cathode side electrode tab 113K is arranged on the left side in the figure. On the other hand, in the second cell sub-assembly 100N illustrated in the upper part of FIG. 6, the cathode side electrode tab 113K is disposed on the right side in the figure, and the anode side electrode tab 113A is disposed on the left side in the figure.

  Thus, even if the arrangement of the anode-side electrode tab 113A and the cathode-side electrode tab 113K is different, the tip 113d of the electrode tab 113 of the unit cell 110 is refracted downward along the stacking direction Z. Further, the tip 113d of each electrode tab 113 is disposed on the same surface side of the stacked body 100S as shown in FIG. 10B. A double-sided tape 160 that adheres to a laminated member that is laminated above is attached to the unit cells 110 that are positioned on the upper surfaces of the first cell sub-assembly 100M and the second cell sub-assembly 100N.

  The pair of spacers 120 (the first spacer 121 and the second spacer 122) are disposed between the stacked unit cells 110 as shown in FIG. As shown in FIGS. 7A and 7B, the first spacer 121 is disposed along one end 112a in the planar direction XY in which the flat unit cell 110 extends. As shown in FIGS. 7A and 7B, the second spacer 122 is in the planar direction XY in which the flat unit cell 110 extends, and the other end of the unit cell 110 opposite to the one end 112a. 112b is disposed along the line 112b. The second spacer 122 has a configuration in which the shape of the first spacer 121 is simplified. Each cell 110 is stacked with a pair of spacers 120 (first spacer 121 and second spacer 122) and then stacked along the stacking direction Z. The pair of spacers 120 (the first spacer 121 and the second spacer 122) are made of reinforced plastics having insulating properties. Hereinafter, after describing the configuration of the first spacer 121, the configuration of the second spacer 122 will be described in comparison with the configuration of the first spacer 121.

  As shown in FIGS. 7A, 7 </ b> B, and 8, the first spacer 121 is formed in a rectangular parallelepiped shape that is long along the short-side direction Y. The first spacer 121 includes mounting portions 121M and 121N at both ends in the longitudinal direction (short direction Y).

  As shown in FIG. 10B, when the first spacer 121 is stacked in a state of being attached to the unit cell 110, the upper surface 121a of the mounting portions 121M and 121N of the first spacer 121 and the first The mounting portions 121M and 121N of the other first spacers 121 disposed above the one spacer 121 come into contact with the lower surfaces 121b.

  As shown in FIGS. 8 and 10B, the first spacer 121 is a position provided on the upper surface 121a of the first spacer 121 in order to perform relative positioning of the unit cells 110 to be stacked. The positioning pin 121c and a positioning hole 121d corresponding to the position of the positioning pin 121c opened in the lower surface 121b of the other first spacer 121 are fitted.

  As shown in FIG. 8, the first spacer 121 includes a locating hole 121 e along the stacking direction Z for inserting a bolt that connects a plurality of assembled batteries 100 connected along the stacking direction Z. Openings to 121M and 121N, respectively.

  As shown in FIG. 8, the first spacer 121 is formed such that a region between the placement parts 121 </ b> M and 121 </ b> N is cut out from the upper side in the stacking direction Z. The notched portion includes a first support surface 121g and a second support surface 121h along the longitudinal direction of the first spacer 121 (the short direction Y of the unit cell 110). The first support surface 121g is formed higher in the stacking direction Z than the second support surface 121h, and is positioned on the unit cell 110 side.

  As shown in FIGS. 7A and 7B, the first spacer 121 is supported by placing one end 112a of the laminate film 112 from which the electrode tab 113 protrudes by the first support surface 121g. doing. The first spacer 121 includes a pair of connecting pins 121i protruding upward from both ends of the first support surface 121g.

  As shown in FIG. 8 and FIG. 10B, the first spacer 121 has a support portion 121j that contacts the electrode tab 113 from the opposite side to the bus bar 131 and supports the tip portion 113d of the electrode tab 113 of the unit cell 110. The second support surface 121h is adjacent to the second support surface 121h and is provided on the side surface along the stacking direction Z. The support part 121j of the first spacer 121 sandwiches the front end part 113d of the electrode tab 113 together with the bus bar 131 so that the front end part 113d and the bus bar 131 are sufficiently in contact with each other.

  As shown in FIGS. 7 and 8, the second spacer 122 has a configuration in which the shape of the first spacer 121 is simplified. The second spacer 122 corresponds to a configuration in which a part of the first spacer 121 is deleted along the short direction Y of the unit cell 110. Specifically, the second spacer 122 is configured by replacing the second support surface 121h and the first support surface 121g of the first spacer 121 with a support surface 122k. Specifically, the second spacer 122 includes mounting portions 122M and 122N, like the first spacer 121. The second spacer 122 includes a support surface 122k in a portion where the region between the placement portions 122M and 122N is cut out from the upper side in the stacking direction Z. The support surface 122k places and supports the other end 112b of the laminate film 112. Similar to the first spacer 121, the second spacer 122 includes a positioning pin 122c, a positioning hole, a locating hole 122e, and a connecting pin 122i.

  As shown in FIGS. 4 and 5, the bus bar unit 130 includes a plurality of bus bars 131 integrally. The bus bar 131 is made of a metal having conductivity, and electrically connects the tip end portions 113d of the electrode tabs 113 of different unit cells 110. The bus bar 131 is formed in a flat plate shape and stands along the stacking direction Z.

  The bus bar 131 includes an anode side bus bar 131A laser welded to the anode side electrode tab 113A of one unit cell 110 and a cathode side laser welded to the cathode side electrode tab 113K of another unit cell 110 adjacent along the stacking direction Z. The bus bar 131K is joined and integrally configured.

  As shown in FIG. 5, the anode-side bus bar 131A and the cathode-side bus bar 131K have the same shape and are formed in an L shape. The anode-side bus bar 131A and the cathode-side bus bar 131K are superposed with the top and bottom reversed. Specifically, the bus bar 131 joins a refracted portion at one end along the stacking direction Z of the anode-side bus bar 131A and a refracted portion at one end along the stacking direction Z of the cathode-side bus bar 131K. It is integrated. As shown in FIG. 5, the anode-side bus bar 131 </ b> A and the cathode-side bus bar 131 </ b> K include a side portion 131 c along the longitudinal direction X from one end in the short-side direction Y. The side part 131 c is joined to the bus bar holder 132.

  The anode-side bus bar 131A is made of aluminum, like the anode-side electrode tab 113A. Similarly to the cathode side electrode tab 113K, the cathode side bus bar 131K is made of copper. The anode side bus bar 131A and the cathode side bus bar 131K made of different metals are joined to each other by ultrasonic joining.

  As shown in FIG. 6, when the battery pack 100 is configured such that the assembled battery 100 is formed by connecting a plurality of battery cells 110 connected in series across a plurality of sets, for example, the anode-side bus bar 131A is Laser welding is performed on the anode-side electrode tabs 113A of the three unit cells 110 adjacent to each other along the stacking direction Z. Similarly, the bus bar 131 laser-welds a portion of the cathode-side bus bar 131K to the cathode-side electrode tabs 113K of the three unit cells 110 adjacent to each other along the stacking direction Z.

  However, among the bus bars 131 arranged in a matrix, the bus bar 131 located at the upper right in FIGS. 4 and 5 corresponds to the end of the anode side of 21 unit cells 110 (3 parallel 7 series), and the anode It consists only of the side bus bar 131A. This anode-side bus bar 131A is laser-bonded to the anode-side electrode tab 113A of the uppermost three unit cells 110 of the battery group 100G. Similarly, among the bus bars 131 arranged in a matrix, the bus bar 131 located at the lower left in the drawing of FIGS. 4 and 5 corresponds to the cathode-side termination of the 21 single cells 110 (3 parallel 7 series), It consists only of the cathode side bus bar 131K. The cathode side bus bar 131K is laser-bonded to the cathode side electrode tabs 113K of the three unit cells 110 at the bottom of the battery group 100G.

  As shown in FIGS. 4 and 5, the bus bar holder 132 integrally holds a plurality of bus bars 131 in a matrix so as to face the electrode tabs 113 of each unit cell 110 in which a plurality of bus bars 131 are stacked. The bus bar holder 132 is made of an insulating resin and has a frame shape.

  As shown in FIG. 5, the bus bar holder 132 is a pair of standing up along the stacking direction Z so as to be positioned on both sides in the longitudinal direction of the first spacer 121 supporting the electrode tab 113 of the unit cell 110. Each column portion 132a is provided. The pair of support columns 132a are fitted to the side surfaces of the mounting portions 121M and 121N of the first spacer 121. The pair of struts 132a are L-shaped when viewed along the stacking direction Z, and are formed in a plate shape extending along the stacking direction Z. The bus bar holder 132 is provided with a pair of auxiliary struts 132 b that are erected along the stacking direction Z so as to be located near the center of the first spacer 121 in the longitudinal direction. The pair of auxiliary struts 132b are formed in a plate shape extending along the stacking direction Z.

  As shown in FIG. 5, the bus bar holder 132 includes insulating portions 132 c that protrude between the bus bars 131 adjacent to each other along the stacking direction Z. The insulating part 132c is formed in a plate shape extending in the short direction Y. Each insulating portion 132c is horizontally provided between the support column portion 132a and the auxiliary support column portion 132b. The insulating part 132c prevents discharge by insulating between the bus bars 131 of the unit cells 110 adjacent along the stacking direction Z.

  The bus bar holder 132 may be configured by joining the supporting column part 132a, the auxiliary supporting column part 132b, and the insulating part 132c formed independently from each other, or the supporting column part 132a, the auxiliary supporting column part 132b, and the insulating part 132c are integrally formed. You may form and comprise.

  As shown in FIGS. 4 and 5, the anode-side terminal 133 corresponds to a terminal on the anode side of the battery group 100 </ b> G configured by alternately stacking the first cell sub-assemblies 100 </ b> M and the second cell sub-assemblies 100 </ b> N.

  As shown in FIGS. 4 and 5, the anode side terminal 133 is joined to the anode side bus bar 131 </ b> A located at the upper right in the figure among the bus bars 131 arranged in a matrix. The anode side terminal 133 is made of a metal plate having conductivity, and when viewed along the short direction Y, the one end 133b and the other end 133c are aligned along the stacking direction Z with the central portion 133a as a reference. It consists of shapes refracted in different directions. The one end 133b is joined to the anode side bus bar 131A by a laser or the like. The other end portion 133c connects an external input / output terminal to a hole 133d (including a screw groove) opened in the center thereof.

  As shown in FIGS. 4 and 5, the cathode-side terminal 134 corresponds to a cathode-side end of the battery group 100G configured by alternately stacking the first cell sub-assemblies 100M and the second cell sub-assemblies 100N. As shown in FIGS. 4 and 5, the cathode side terminal 134 is joined to the cathode side bus bar 131K located at the lower left in the figure among the bus bars 131 arranged in a matrix. The cathode side terminal 134 has the same configuration as the anode side terminal 133.

  As shown in FIGS. 1, 3, and 4, the protective cover 140 covers the bus bar unit 130 so that the bus bars 131 are short-circuited with each other, or the bus bar 131 is in contact with an external member to be short-circuited or grounded. Is prevented. Further, the protective cover 140 causes the anode side terminal 133 and the cathode side terminal 134 to face the outside, and charges and discharges the power generation element 111 of each unit cell 110. The protective cover 140 is made of plastics having insulating properties.

  As shown in FIG. 4, the protective cover 140 is formed in a flat plate shape and is erected along the stacking direction Z. The protective cover 140 has a shape in which the upper end 140b and the lower end 140c of the side surface 140a thereof are refracted along the longitudinal direction X, and is fitted to the bus bar unit 130.

  As shown in FIGS. 3 and 4, the side surface 140 a of the protective cover 140 is formed of a rectangular hole slightly larger than the anode side terminal 133 at a position corresponding to the anode side terminal 133 provided in the bus bar unit 130. A first opening 140d is provided. Similarly, the side surface 140a of the protective cover 140 includes a second opening 140e formed of a rectangular hole slightly larger than the cathode side terminal 134 at a position corresponding to the cathode side terminal 134 provided in the bus bar unit 130. Yes.

  As shown in FIGS. 1 and 2B, the housing 150 accommodates the battery group 100G in a state of being pressurized along the stacking direction. The upper pressure plate 151 and the lower pressure plate 152 apply an appropriate surface pressure to the power generation element 111 by pressing the power generation element 111 of each unit cell 110 provided in the battery group 100G while sandwiching it. In other words, the height of the battery group 100G in the assembled battery 100 is the height when the unit cells 110 are stacked by the same number as the battery group 100G in an unloaded state by the upper pressure plate 151 and the lower pressure plate 152. The height is lower than the height.

  As shown in FIGS. 1 and 3, the upper pressure plate 151 is disposed above the battery group 100G in the stacking direction Z. The upper pressure plate 151 has a pressure surface 151 a protruding downward along the stacking direction Z in the center. The power generation element 111 of each unit cell 110 is pressed downward by the pressing surface 151a. The upper pressure plate 151 includes a holding portion 151 b that extends along the longitudinal direction X from both sides along the lateral direction Y. The holding part 151b covers the placement parts 121M and 121N of the first spacer 121 or the placement parts 122M and 122N of the second spacer 122. In the center of the holding portion 151b, a locating hole 151c communicating with the positioning hole 121d of the first spacer 121 or the positioning hole 122d of the second spacer 122 along the stacking direction Z is opened. Bolts that connect the assembled batteries 100 are inserted into the locate holes 151c. The upper pressure plate 151 is made of a metal plate having a sufficient thickness. As shown in FIG. 3, the upper pressure plate 151 has a bent portion 151 d that is bent at both ends in the lateral direction Y that intersects the stacking direction Z as a joint with the side plate 153.

  As shown in FIGS. 1 and 3, the lower pressure plate 152 has the same configuration as the upper pressure plate 151, and is arranged with the upper pressure plate 151 turned upside down. The lower pressure plate 152 is disposed below along the stacking direction Z of the battery group 100G. The lower pressure plate 152 presses the power generation element 111 of each unit cell 110 upward by a pressure surface 152a protruding upward along the stacking direction Z. The lower pressure plate 152 also has a bent portion 152d that is bent at both ends in the short direction Y intersecting the stacking direction Z as a joint with the side plate 153 as shown in FIG.

  As shown in FIGS. 1 and 3, the pair of side plates 153 is arranged so that the upper pressure plate 151 and the lower pressure plate 152 that pressurize the battery group 100G while sandwiching the battery group 100G from above and below in the stacking direction Z are not separated from each other. The relative positions of the pressure plate 151 and the lower pressure plate 152 are fixed. The side plate 153 is made of a metal plate as shown in FIGS. 3 and 9 and is erected along the stacking direction Z. As shown in FIG. 9, the pair of side plates 153 includes a convex portion 153e that protrudes in a convex shape when viewed in plan from the stacking direction Z, and a concave portion 153f that is formed to be concave on the surface opposite to the convex portion 153e. Prepare. As will be described later, the concave portion 153f is in contact with the convex portion 171 of the heat radiating plate 170, and forms a regulating portion 180 that regulates the movement of the heat radiating plate 170 and the battery group 100G between the heat radiating plate 170. The pair of side plates 153 are disposed outward from the bent portion 151 d of the upper pressure plate 151 and the bent portion 152 d of the lower pressure plate 152. The pair of side plates 153 are joined to the upper pressure plate 151 and the lower pressure plate 152 from both sides in the short direction Y of the battery group 100G by laser welding. As shown in FIG. 2B, each side plate 153 has a linear welded portion 153c by seam welding or the like along the longitudinal direction X with respect to a portion of the upper end 153a that is in contact with the upper pressure plate 151. Several (corresponding to the joint) are formed. Similarly, each side plate 153 has a linear welded portion 153d (corresponding to a joint portion) formed by seam welding or the like along the longitudinal direction X with respect to the portion of the lower end 153b in contact with the lower pressure plate 152. Several places are formed. The pair of side plates 153 covers and protects both sides in the short direction Y of the battery group 100G.

  The heat radiating plate 170 is disposed between the single cells 110 constituting the battery group 100G. The heat radiating plate 170 is used to radiate heat generated mainly during charging / discharging of the battery group 100G to the outside. As shown in FIGS. 3 and 4, the heat radiating plate 170 has a portion protruding outward from the unit cell 110 when viewed in plan from the stacking direction Z, and is in contact with the side plate 153. Thereby, the heat generated inside is transferred to the outside and radiated. As shown in FIG. 9, the heat radiating plate 170 has a convex portion 171 that protrudes outward from two sides of the outer periphery of the rectangular shape when viewed in plan from the stacking direction Z and contacts the concave portion 153 f of the side plate 153.

  As shown in FIG. 9, the convex portion 171 contacts the concave portion 153 f of the side plate 153 and suppresses movement of the heat radiating plate 170 in the longitudinal direction X in which the electrode tab 113 extends when the external force is applied. The restriction part 180 is formed. Further, as described above, the upper pressure plate 151, the lower pressure plate 152, and the side plate 153 are joined in a state where the battery group 100G is pressurized in the stacking direction Z. Therefore, the convex part 171 of the heat sink 170 and the concave part 153f of the side plate 153 are in contact with each other, so that not only the heat sink 170 but also the battery group 100G is prevented from moving.

  In FIG. 9, the convex part 171 of the heat sink and the convex part 153e and the concave part 153f of the side plate 153 are provided at two locations on the upper and lower sides in FIG. However, as long as the movement of the heat sink 170 can be suppressed and the movement of the battery group 100G can be suppressed, the positions and number of the protrusions 171, the protrusions 153e, and the recesses 153f are not limited to those in FIG. In addition, the heat sink 170 is comprised with metals, such as aluminum with comparatively high heat conductivity.

  The assembled battery 100 according to the first embodiment described above has the following effects. In the first embodiment, the pair of side plates 153 are joined to the upper pressure plate and the lower pressure plate 152 in a state where the battery group 100G is pressurized in the stacking direction Z by the upper pressure plate 151 and the lower pressure plate 152. Further, between the side plate 153 and the heat radiating plate 170, a restricting portion 180 that restricts the movement of the heat radiating plate 170 in the planar direction XY in which the unit cell 110 extends is formed.

  With this configuration, the movement of the heat radiating plate 170 by the restriction unit 180 can be restricted to the battery group 100G. Therefore, even if an external force is input, the movement of the battery group 100G and the like can be suppressed, and the reliability of the assembled battery 100 against an impact can be improved.

  Further, the concave portion 153f of the side plate 153 and the convex portion 171 of the heat radiating plate 170 are in contact with each other in the longitudinal direction X in which the electrode tab 113 extends, particularly in the XY plane. Even if the electrode tab 113 is joined to the bus bar 131 or the like, the electrode tab 113 may not be particularly fixed to the housing 150. Also in such a case, by configuring as described above, it is possible to suppress the movement in the longitudinal direction X in which the battery group 100G and the like easily move, and to improve the reliability of the assembled battery 100 against an impact.

  Further, in the present embodiment, the restricting portion 180 can be configured by specifically matching the concave portion 153 f provided on the side plate 153 with the convex portion 171 formed on the heat radiating plate 170.

(Second Embodiment)
Next, the assembled battery according to the second embodiment will be described. FIG. 11 is a partial cross-sectional view showing a heat radiating plate and a side plate at the same position as FIG. 9 in the assembled battery according to the second embodiment. In the second embodiment, only the configuration of the side plate and the heat radiating plate constituting the housing 150 is different from that of the first embodiment, and the others are the same, and thus the description regarding the same configuration is omitted.

  In the second embodiment, the heat radiating plate 270 includes an engaging portion 271 that engages with the side plate 253 in order to connect to the side plate 253 on at least one side of the rectangular shape when viewed in plan from the stacking direction Z, as shown in FIG. Have. On the other hand, the side plate 253 has an engaged portion 253h provided with a hole portion that is hooked, in other words, engaged by the engaging portion 271 of the heat radiating plate 270 at any height position in the stacking direction Z. . The engaging portion 271 is inserted through the hole portion of the engaged portion 253h and the hole portion of the engaged portion 253h, and is further disposed on the outer side of the side plate 253. And an outer arrangement portion 273 that comes into contact with the outer arrangement portion 273. The engaging portion 271 and the engaged portion 253h constitute a restricting portion 280.

  Next, the effect of the assembled battery according to the second embodiment will be described. As described above, according to the assembled battery according to the second embodiment, the restricting portion 280 is provided on the engaging portion 271 provided on the heat radiating plate 270 and on the side plate 253 and is engaged with the engaging portion 271 on the heat radiating plate 270. And an engaged portion 253h thus formed. Therefore, similarly to the first embodiment, the movement of the heat dissipation plate 270 can be restricted and the movement of the battery group 100G and the like can be restricted to improve the reliability of the assembled battery against an impact.

(Third embodiment)
Next, the assembled battery according to the third embodiment will be described. FIG. 12 is a partial cross-sectional view showing the heat radiating plate and the side plate at the same position as FIG. 9 in the assembled battery according to the third embodiment. In 3rd Embodiment, since only the structure of the side plate and heat sink which comprise the housing | casing 150 differs from 1st Embodiment, and others are the same, description regarding the same structure is abbreviate | omitted.

  In the third embodiment, the side plate 353 and the heat radiating plate 370 are integrally fixed by a connecting member 354 as shown in FIG. The side plate 353 is provided with an insertion hole 353i through which the connecting member 354 is inserted. The connecting member 354 includes an insertion portion 354h that is inserted through the insertion hole 353i of the side plate 353, and a pressing portion 354i that is provided outward from the insertion hole 353h and presses the side plate 353 toward the heat dissipation plate 370 by contacting the side plate 353. And a pressing portion 354j that is embedded in the heat dissipation plate 370 and presses the heat dissipation plate 370 toward the side plate 353. The heat radiating plate 370 has an attachment portion 371 for attaching the connecting member 354 without dropping it. The attachment portion 371 is configured such that the cross section on the back side from the entrance is larger.

  The pressing portion 354j includes a portion whose cross section is larger than that of the insertion portion 354h. The connecting member 354 is made of an elastically deformable member such as a resin, and the pressing portion 354j is reduced in size and passes through the insertion hole 353i and enters the attachment portion 371. The attachment portion 371 has a large unloaded state. It expands and deforms to a certain extent. This prevents the connecting member 354 from falling off. In the connecting member 354, the pressing portion 354 i presses the side plate 353 against the heat radiating plate 370, and the pressing portion 354 j presses the heat radiating plate 370 against the side plate 353, thereby fixing the heat radiating plate 370 and the side plate 353 together. The restricting portion 380 includes a connecting member 354, an insertion hole 353 i in the side plate 353, and an attachment portion 371 in the heat radiating plate 370. The side plate 353 and the heat radiating plate 370 are in contact with each other in the short direction Y.

  Next, the effect of the assembled battery according to the third embodiment will be described. As described above, in the third embodiment, the connecting member 354 is inserted into the insertion hole 353 i of the side plate 353 and attached to the attachment portion 371 of the heat radiating plate 370. Therefore, similarly to the first and second embodiments, the movement of the heat dissipation plate 370 can be restricted and the movement of the battery group 100G and the like can be restricted to improve the reliability of the assembled battery against an impact.

(Fourth embodiment)
Next, the assembled battery according to the fourth embodiment will be described. FIG. 13 is a cross-sectional view showing the heat radiating plate, the side plate, the first spacer, and the second spacer at the same position as FIG. 9 in the assembled battery according to the fourth embodiment. In the fourth embodiment, only the configurations of the side plate, the heat radiating plate, the first spacer, and the second spacer constituting the housing 150 are different from those of the first embodiment, and the others are the same.

  In the fourth embodiment, the side plate 453 has an attachment portion 453g for attaching to the first spacer 421 and the second spacer 422 as shown in FIG. The attachment portion 453g is configured by bending an end portion in the longitudinal direction X of the side plate 453.

  As shown in FIG. 13, the first spacer 421 and the second spacer 422 include receiving portions 421k and 422k for attaching the attaching portion 253g of the side plate 453 in addition to the configuration of the first embodiment. The receiving portions 421k and 422k are configured by grooves into which the attaching portion 453g which is an end portion of the side plate 453 can be inserted. However, the present invention is not limited to this as long as the attachment portion 453g can be attached to restrict the movement of the heat sink 470. The attachment portion 453g contacts the receiving portions 421k and 422k in the longitudinal direction X in which the electrode tab 113 extends. The restricting portion 480 is configured by the attachment portion 453g of the side plate 453 and the receiving portions 421k and 422k of the first spacer 421 and the second spacer 422.

  Here, as shown in FIG. 13, the heat radiating plate 470 and the attachment portion 453 g of the side plate 453 are in a state in which a gap is provided when no external force is applied. In this embodiment, especially when an external force is applied, the heat sink 470 and the like come into contact with the mounting portion 453g, and the restriction portion 480 restricts movement of the heat sink 470 and the battery group 100G in the longitudinal direction X in which the electrode tab 113 extends. ing.

  Next, the function and effect of the assembled battery according to the fourth embodiment will be described. In the fourth embodiment, the restricting portion 480 attaches the attachment portion 453g of the side plate 453 to the receiving portion 421k of the first spacer 421 and the receiving portion 422k of the second spacer 422, and moves in the longitudinal direction X particularly in the plane direction XY. regulate. Accordingly, not only the movement of the heat sink 470 but also the movement of the battery group 100G and the like can be restricted as in the first embodiment, and the reliability of the assembled battery against an impact can be improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. FIG. 14 is a cross-sectional view showing a modification of FIG. In the third embodiment, the embodiment in which the heat radiating plate 370 and the side plate 353 are in contact with each other in the short direction Y has been described, but the present invention is not limited to this.

  If the movement of the heat radiating plate 370 relative to the side plate 353 can be restricted, the connecting member 355 can also be configured as follows. As shown in FIG. 14, the connecting member 355 is provided outside the insertion portion 355h through the insertion hole 353i of the side plate 353 and contacts the side plate 353 so that the side plate 353 faces the heat dissipation plate 370. And a pressing portion 355i that is embedded in the heat dissipation plate 370 and presses the heat dissipation plate 370 toward the side plate 353, and a separation portion 355k that separates the side plate 353 and the heat dissipation plate 370.

  The insertion portion 355h is the same as the insertion portion 354h of the connecting member 354, the pressing portion 355i is the same as the pressing portion 354i, and the pressing portion 355j is the same as the pressing portion 354j, and thus the description thereof is omitted. The connecting member 355 is made of an elastically deformable material such as a resin, like the connecting member 354.

  The spacing portion 355k is configured to be larger than the insertion hole 353h of the side plate 353, and if the spacing portion 355k and the pressing portion 355j are reduced and deformed, they can pass through the insertion hole 353h. However, once passing through the insertion hole 353i, the separating portion 355k and the pressing portion 355j cannot pass through the insertion hole 353h again unless a considerable force is applied by the pressing portion 355j. By configuring the connecting member 355 as described above, it is possible to restrict the movement of the heat radiating plate 370 relative to the side plate 353 and to restrict the movement of the unit cell 110 and the like, thereby improving the reliability of the assembled battery against an impact.

  In addition, you may join the heat sink 170,270,370,470 in 1st Embodiment-4th embodiment with the side plates 153,253,353,453 by an adhesive tape or an adhesive agent. By comprising in this way, it can prevent or suppress that a heat sink and a side plate contact and sound is produced.

100 battery packs,
100G battery group,
110 cell,
110H battery body,
111 power generation elements,
113 electrode tabs,
221 first spacer;
222 second spacer,
221k, 222k receiving part,
151 Upper pressure plate (first cover member),
152 lower pressure plate (first cover member),
153, 253, 353, 453 side plates (a pair of second cover members),
153f recess,
253g mounting part,
353h hole,
454 connecting member,
170, 270, 370, 470 heat sink,
171 convex part,
371 hook,
180, 280, 380, 480 regulating section,
X longitudinal direction (direction in which the electrode tab extends),
Z Stacking direction.

Claims (6)

A plurality of unit cells each including a battery body including a power generation element and formed flat and an electrode tab derived from the battery body are stacked in the thickness direction, and the unit cell is disposed at least at one location between the adjacent unit cells. A battery group in which a heat dissipating plate that dissipates heat generated when the battery is used;
A pair of first cover members covering the battery group from both sides in the stacking direction of the unit cells;
A pair of second cover members that cover the battery group from both sides in a direction that intersects the stacking direction and that intersects the direction in which the electrode tab extends,
The pair of second cover members are joined to the pair of first cover members in a state where the battery group is pressurized in the stacking direction by the pair of first cover members.
A battery assembly in which a restricting portion for restricting movement of the heat radiating plate in a planar direction in which the unit cell extends is formed between at least one second cover member of the pair of second cover members and the heat radiating plate. . The electrode tab extends in one direction in the planar direction,
The assembled battery according to claim 1, wherein the one second cover member and the heat radiating plate are in contact with each other in a direction in which the electrode tab extends. Either one of the second cover member and the heat radiating plate includes a convex portion, and the other includes a concave portion that contacts the convex portion,
The assembled battery according to claim 1, wherein the restricting portion includes the convex portion and the concave portion. The heat radiating plate includes an engaging portion that engages with the one second cover member,
The one second cover member includes an engaged portion to be engaged with the engaging portion,
The assembled battery according to claim 1, wherein the restricting portion includes the engaging portion and the engaged portion. A connecting member formed by connecting the second cover member and the heat sink together;
The assembled battery according to claim 1, wherein the restricting portion is configured by attaching the connecting member to the one second cover member and the heat radiating plate. The battery group further includes a spacer disposed between the unit cells adjacent to each other in the stacking direction, which is an end portion in a direction in which the unit cells extend flatly.
The one second cover member includes an attachment portion to be attached to the spacer, and the spacer has a receiving portion to attach the attachment portion of the one second cover member,
The assembled battery according to claim 1, wherein the restricting portion is configured by the attachment portion and the receiving portion.