JP6135532B2 - Multilayer battery holding structure - Google Patents

Description

  The present invention relates to a holding structure for a stacked battery in which flat batteries are stacked.

  In a conventional stacked battery in which a plurality of flat batteries are stacked, a support member provided on an insulating member in order to suppress external force applied to the output terminal and reduce stress concentration at the joint between the electrode tab and the output terminal The output terminal is supported by (see, for example, Patent Document 1).

JP 2010-287568 A

  Flat batteries are likely to have variations in thickness. For example, if a laminate film type battery is used, the thickness variations may be further increased. When batteries having variations in thickness are stacked as described above, the dimensions of the stacked battery after stacking also vary. Therefore, in the support member described in the above-mentioned Patent Document 1, it is not possible to cope with variations in dimensions, and there is a possibility that the portion of the support member to be locked becomes unstable.

  Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide a stacked battery holding structure that can absorb thickness variations and prevent stress concentration on an output terminal. To do.

  The present invention employs the following technical means in order to achieve the aforementioned object.

  The present invention includes an elastic member (63) that is provided at the fastening portion of the fastening member (64, 65) and absorbs the fastening force of the fastening member, and the side plate (21) is a side portion of the flat battery (19). The positive terminal (22) and the negative terminal (23) provided on the side portion of the stacked battery (20) are exposed to the outside, and the pair of end plates (60) are tightened by fastening members. The laminated battery holding structure is characterized in that the end plates are pressed closer to each other and the end plate presses the laminated battery inward.

  According to the present invention as described above, the pair of end plates approach each other by fastening the fastening member, and the end plates press the laminated battery inward by fastening. As a result, it is possible to reliably restrain the flat battery whose thickness tends to vary. Moreover, an elastic member is provided in the fastening part of the fastening member. Since the elastic member absorbs the fastening force by the fastening member, it can be reliably restrained while absorbing the thickness variation. Thus, the stacked battery can be stably restrained.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

1 is a perspective view showing a battery module 10. FIG. FIG. 3 is a perspective view showing a battery module assembly 11. 4 is an enlarged perspective view showing a part of the front side of the battery module assembly 11. FIG. 4 is an enlarged perspective view showing a part of the back side of the battery module assembly 11. FIG. 2 is an exploded perspective view of the battery module 10. FIG. 3 is a perspective view of a side plate 21. FIG. 3 is an enlarged cross-sectional view showing a part of the battery module 10. FIG.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The battery module 10 has a stacked battery 20 inside. The stacked battery 20 is configured by stacking a plurality of flat batteries 19. The plurality of battery modules 10 are electrically connected in series to form a battery module assembly 11 shown in FIG. The battery module assembly 11 is used in, for example, a hybrid vehicle using a traveling drive source by combining an internal combustion engine and a motor driven by electric power charged in a battery, an electric vehicle using a motor as a travel drive source, and the like. The flat battery 19 is, for example, a nickel hydrogen secondary battery, a lithium ion secondary battery, or an organic radical battery.

  The battery module 10 is controlled by electronic components used for charging and discharging of the plurality of flat batteries 19 or temperature adjustment. Further, the battery module 10 accommodates therein a plurality of flat batteries 19 that are electrically connected in series and stacked. The electronic component is, for example, a DC / DC converter, a motor that drives a blower member, an electronic component controlled by an inverter, various electronic control devices, and the like.

  The flat battery 19 has a flat plate shape with a thin outer case. The outer case is made of, for example, an insulating laminate sheet. The flat battery 19 has an internal space sealed by heat-sealing the outer edges of two laminate sheets. In this internal space, an electrode laminate, an electrolyte, a terminal connection part, a part of the positive terminal part 30, and a part of the negative terminal part 31 are built.

  The remaining portions of the positive electrode terminal portion 30 and the negative electrode terminal portion 31 protrude from the outer case of the flat battery 19 to the outside. The terminal exposed from the outer case is connected to a terminal having a different polarity in the adjacent flat battery 19. Therefore, the laminated | stacked several flat battery 19 is connected in series. Of the terminals connected in series, the terminals at both ends, that is, the plus terminal 22 and the minus terminal 23 installed at both ends of the stacked battery 20 are supplied with electric power or discharged toward other electric devices. Used for.

  As shown in FIG. 5, the plus terminal 22 and the minus terminal 23 of the stacked battery 20 include a protruding portion 24 protruding from the side portion of the stacked battery 20, and a bent portion 25 bent inward from the tip of the protruding portion 24. Respectively. Therefore, the plus terminal 22 and the minus terminal 23 have an L-shaped cross section when viewed downward. A convex portion 26 is provided on the surface of the bent portion 25. The plus terminal 22 and the minus terminal 23 have rigidity, and as shown in FIG. 1, the side plate 21 is sandwiched between the protruding portions 24 and holds the bent portions 25 outside. As a result, as shown in FIG. 1, the side plate 21 covers the positive electrode terminal portion 30 and the negative electrode terminal portion 31, which are conductive portions provided on the side portion of the flat battery 19, and is provided on the side portion of the stacked battery 20. The positive terminal 22 and the negative terminal 23 are exposed to the outside.

  As shown in FIGS. 2 and 3, terminals of different polarities of adjacent battery modules 10 are electrically connected by a bus bar 40. In addition, a partition wall 27 is provided between the terminals of the same battery module 10 in the side plate 21 so that a mistake in mounting the bus bar 40 does not occur. The side plate 21 is provided with an anti-rotation wall 28 that holds a bus bar 40 that is a conductive member. The rotation prevention walls 28 are provided above and below the bus bar 40 for suppressing the rotation of the bus bar 40. Since the bus bar 40 is provided between the upper and lower adjacent rotation prevention walls 28, the bus bar 40 is restrained by the rotation prevention wall 28. Therefore, it is possible to suppress the stress from acting on the bus bar 40.

  As shown in FIG. 3, the current cable 41 is connected to the positive terminal 22 or the negative terminal via the flat connector in the battery module 10 located on the end opposite to the output portion 50 of the battery module assembly 11. Connected to terminal 23. The current cable 41 is a conductive member, and extends from the battery module 10 located at the end in the direction in which the battery modules 10 are arranged, and extends to the output unit 50 of the battery module assembly 11. One side plate 21 shown in FIG. 6 has a holding portion 29 for holding the current cable 41 on the outside. The holding part 29 is formed in a concave shape as shown in FIG. The depth of the holding part 29 is selected to be slightly larger than the outer diameter of the current cable 41. As a result, the current cable 41 can be fitted and held.

  The other side plate 21 shown in FIG. 4 is provided with an electronic component 42 for monitoring the state of the flat battery 19 outside. Therefore, the electronic component 42 is located on the side opposite to the current path of the current cable 41 and the bus bar 40. As a result, it is possible to prevent the electronic component 42 from being affected by noise or the like generated from the current path.

  Next, the holding structure of the battery module 10 will be described. As shown in FIG. 5, the battery module 10 includes a pair of end plates 60, a pair of side plates 21, a top plate 61, a bottom plate 62, an electronic component 42, an elastic member 63, a bolt 64, and a nut 65. .

  The exterior of the battery module 10 includes a pair of end plates 60, a pair of side plates 21, a top plate 61, and a bottom plate 62. The pair of end plates 60 are respectively provided on the front surface and the back surface of the stacked battery 20 and presses the stacked battery 20 inward. The pair of side plates 21 are insulative and are respectively provided on the left side surface and the right side surface of the stacked battery 20 and connect the pair of end plates 60. The top plate 61 covers the top surface of the stacked battery 20, and the bottom plate 62 is provided so as to cover the bottom surface of the stacked battery 20.

  The end plate 60 has four L-shaped leg portions 66 at four corners. The leg portion 66 is formed with a hole through which the bolt 64 is inserted. The side plate 21 is formed with an insertion portion 67 that protrudes upward and downward. A hole through which the bolt 64 is inserted is formed in the insertion part 67. When the end plate 60 is assembled, a cylindrical elastic member 63 is inserted into the bolt 64 in advance. The elastic member 63 is provided at a fastening portion between a bolt 64 and a nut 65 which are fastening members. The elastic member 63 is elastic like rubber, for example, and has a function of absorbing the tightening force of the bolt 64. Then, the leg portions 66 of the pair of end plates 60 facing each other are connected to each other by a bolt 64 and a nut 65 via an insertion portion 67 of the side plate 21.

  As shown in FIG. 7, when the bolt 64 and the nut 65 are tightened in the connected state, the distance between the bolt 64 and the nut 65 is reduced, and the stacked battery 20 is sandwiched from both sides by the pair of end plates 60. . The bolts 64 and the nuts 65 are tightened to approach each other, and the end plate 60 presses the stacked battery 20 inward by the tightening. As a result, the stacked flat battery 19 between the pair of opposite end plates 60 is pressed to restrain expansion of the flat battery 19. As a result, the stacked battery 20 is restrained by the pair of end plates 60, and the holding structure of the stacked battery 20 is realized. A top plate 61 is covered on an upper surface formed by connecting two end plates 60 with bolts 64 and nuts 65. The lower part is supported by the bottom plate 62.

  As described above, in the holding structure for the stacked battery 20 of the present embodiment, the pair of end plates 60 come close to each other by tightening the bolts 64 and the nuts 65, and the end plate 60 brings the stacked battery 20 inside by tightening. Pressing. As a result, the flat battery 19 whose thickness tends to vary can be reliably restrained. Further, an elastic member 63 is provided at the fastening portion of the fastening member. Since the elastic member 63 absorbs the tightening force by the bolt 64 and the nut 65, it can be reliably restrained while absorbing the thickness variation. Accordingly, the stacked battery 20 can be stably restrained.

  Moreover, in this embodiment, the side plate 21 is pinched | interposed into each protrusion part 24, and hold | maintains each bending part 25 on the outer side. Accordingly, the bent portion 25 that is the tip portion of the plus terminal 22 and the minus terminal 23 can be supported outside the side plate 21. Therefore, the displacement of the bent portion 25 can be suppressed by the side plate 21, and the vibration of the bent portion 25 can be suppressed from being transmitted to the stacked battery 20. Further, by sandwiching the side plate 21 with the protruding portion 24, the terminal and the side plate 21 can be integrated. Thereby, it has high rigidity and can improve torque resistance.

  Further, the side plate 21 has a holding portion 29 for holding the current cable 41 and the bus bar 40 connected to the plus terminal 22 or the minus terminal 23 on the outside. As a result, stress concentration at the joint between the bus bar 40 and the current cable 41 and the plus terminal 22 or minus terminal 23 can be reduced.

  In other words, by adding a support structure for supporting the terminal, the current cable 41 and the like to the side plate 21, the force received by each terminal with respect to the rotational torque is received by the support structure, and is applied to the joint between the bus bar 40 and each terminal. Stress concentration can be reduced.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the first embodiment described above, the flat battery 19 constituting the battery stack can also be constituted by a single battery having a rectangular outer case made of metal. This rectangular unit cell is a flat rectangular parallelepiped whose outer peripheral surface is covered with an outer case made of, for example, aluminum or an aluminum alloy. The battery stack may be formed by integrating an assembly in which a predetermined number of cells and insulating spacers are alternately stacked, sandwiching the end plates 60 from both ends in the stacking direction, and applying inward restraining force. Good.

  In the first embodiment described above, the fastening member is realized by the bolt 64 and the nut 65. However, the fastening member is not limited to such a configuration. For example, the fastening member is formed by forming a hole having an internal thread in one end plate 60. May be realized. Further, the fastening member may be a member that is pressed by a spring force like a clothespin.

  In the first embodiment described above, the elastic member 63 is cylindrical. However, the elastic member 63 is not limited to the cylindrical shape, and may be any position and shape that absorbs the tightening force. In the first embodiment, the number of battery modules 10 is not limited to the disclosed form. For example, two or more battery modules 10 arranged in a row may be provided.

DESCRIPTION OF SYMBOLS 10 ... Battery module 11 ... Battery module assembly 19 ... Flat battery 20 ... Stacked battery 21 ... Side plate 22 ... Positive terminal 23 ... Negative terminal 24 ... Projection part 25 ... Bending part 29 ... Holding part 40 ... Bus bar (conductive member) )
41 ... Current cable (conductive member) 60 ... End plate 63 ... Elastic member 64 ... Bolt (fastening member)
65 ... Nut (fastening member)

Claims (3)

A holding structure for a stacked battery (20) in which a plurality of flat batteries (19) are stacked in the thickness direction,
A pair of end plates (60) provided on the front surface and the back surface of the stacked battery, respectively, for pressing the stacked battery inward;
A pair of side plates (21) having insulating properties, provided on the left side surface and the right side surface of the stacked battery, respectively, for connecting the pair of end plates;
Fastening members (64, 65) for connecting the pair of end plates and the side plates;
An elastic member (63) that is provided at a fastening portion of the fastening member and absorbs a fastening force of the fastening member;
The side plate covers a conductive portion provided on a side portion of the flat battery, and exposes a plus terminal (22) and a minus terminal (23) provided on the side portion of the stacked battery,
A pair of the end plates approach each other by tightening the fastening member, and the end plate presses the stacked battery inward by the tightening. The positive terminal and the negative terminal each have a protruding portion (24) protruding from a side portion of the stacked battery, and a bent portion (25) bent inward from the tip of the protruding portion,
2. The stacked battery holding structure according to claim 1, wherein the side plate is sandwiched between the protrusions and holds the bent portions outward.   The said side plate has the holding | maintenance part which hold | maintains the electrically-conductive member (40, 41) connected to the said plus terminal or the said minus terminal outside, The holding | maintenance of the laminated battery of Claim 1 or 2 characterized by the above-mentioned. Construction.

Images