JP6977591B2 - Batteries assembled - Google Patents

Description

The present invention relates to an assembled battery in which a plurality of batteries including an outer electrode terminal member and a terminal bolt are electrically connected via a connecting member.

A battery including an outer electrode terminal member arranged outside the battery case and a terminal bolt for connecting the outer electrode terminal member to a connecting member outside the battery is known. In this battery, an insulating member made of an insulating resin is arranged between the battery case and the outer electrode terminal member and the terminal bolt to insulate between the battery case and the outer electrode terminal member and the terminal bolt. Specifically, as shown in FIGS. 10 and 11, in the terminal bolt 970, the bolt head 971 is located between the insulating member 950 and the outer electrode terminal member 935, and the bolt shaft portion 973 is the bolt head. It is arranged so as to extend from the portion 971 through the outer electrode terminal member 935 to the battery outer side BS (upper in FIG. 11). In addition, in FIG. 11 and FIG. 12 described later, the description of the battery case is omitted.

Further, when the nut 930 is fastened to the bolt shaft portion 973 of the terminal bolt 970 penetrating the outer electrode terminal member 935 and the connecting member 920 and the outer electrode terminal member 935 is connected to the connecting member 920, the terminal bolt 970 is the nut 930. The above-mentioned insulating member 950 is provided with a detent wall portion 953b in order to prevent co-rotation with the above-mentioned insulating member 950. That is, it extends perpendicularly to the battery outer side BS from the bottom wall portion 953a of the insulating member 950 arranged between the battery case (not shown) and the bolt head 971, and is located around the radial direction of the bolt head 971. A detent wall portion 953b that regulates the co-rotation of the bolt head 971 is provided on the insulating member 950. For example, Patent Document 1 discloses such a form of a battery (see the scope of claims of Patent Document 1, FIG. 3 and the like).

Japanese Unexamined Patent Publication No. 2016-143466

However, in the above-mentioned battery, when the nut 930 is fastened to the terminal bolt 970, the terminal bolt 970 rotates around the axis EX, and the corner portion (axial ridge portion 971r) of the bolt head 971 is the insulating member 950. The insulating member 950 may be damaged when it comes into contact with the detent wall portion 953b. Specifically, when the axial ridge portion 971r of the bolt head 971 abuts on the detent wall portion 953b when the nut 930 is fastened, the detent wall portion 953b is radially outside as shown in FIG. It is deformed so as to spread in the FB (left-right direction in FIG. 12). However, when the tightening torque of the nut 930 is large, the deformation of the detent wall portion 953b to the radial outer side FB exceeds the deformation allowable amount, and the detent wall portion 953b and the bottom wall portion 953a of the insulating member 950 Damage such as cracks occurs near the boundary (the part indicated by W in FIG. 12).

Since the detent wall portion 953b extends vertically from the bottom wall portion 953a to the battery outer side BS as described above, the deformation allowance of the detent wall portion 953b to the radial outer FB is the bottom wall portion 953a. It is smaller toward the root side (battery case side, lower in FIG. 12) of the detent wall portion 953b connected to the bottom wall portion 953b, and is larger toward the battery outer side BS away from the bottom wall portion 953a. In the above battery, when the nut 930 is fastened, the tip portion 971rs (battery case side, lower portion in FIG. 12) of the axial ridge portion 971r of the bolt head 971 is the bottom wall portion of the detent wall portion 953b. It abuts on 953 bg near the root connected to 953a. Therefore, it is considered that the deformation of the detent wall portion 953b to the radial outer side FB easily exceeds the deformation allowable amount, and the above-mentioned damage is likely to occur in the insulating member 950.

The present invention has been made in view of the current situation, and the axial ridge of the bolt head is brought into contact with the detent wall portion of the insulating member when the nut is fastened to prevent co-rotation of the terminal bolt. It is an object of the present invention to provide an assembled battery in which damage to the insulating member is suppressed.

One aspect of the present invention for solving the above problems is a battery case, an outer electrode terminal member arranged outside the battery case, and a polygon arranged between the battery case and the outer electrode terminal member. It is composed of a columnar bolt head, a terminal bolt including a bolt shaft portion extending from the bolt head to the outside of the battery through the outer electrode terminal member, and an insulating resin, and the battery case and the outer electrode. The outer electrode terminal is provided with a plurality of batteries arranged between the terminal member and the bolt head and having an insulating member which is arranged between the battery case, the outer electrode terminal member, and the bolt head. An assembled battery formed by fastening a nut to the bolt shaft portion penetrating the member and the connecting member, connecting the outer electrode terminal member to the connecting member, and electrically connecting the batteries to each other via the connecting member. The insulating member extends from the bottom wall portion arranged between the battery case and the bolt head to the outside of the battery from the bottom wall portion, and extends around the radial direction of the bolt head. It has a detent wall portion that is located and regulates the co-rotation of the bolt head, and the detent wall portion is the bolt head when the terminal bolt rotates with the fastening of the nut. The contact wall portion includes the contact wall portion to which the axial ridge portion extending in the axial direction of the bolt abuts, and the contact wall portion is the outer inner wall surface located on the outer side of the battery among the contact inner wall surfaces which are the inner wall surfaces thereof. However, the assembled battery is located radially inside the inner wall surface on the case side, which is located on the battery case side.

In each battery constituting the above-mentioned assembled battery, the contact wall portion of the detent wall portion of the insulating member has a form in which the outer inner wall surface thereof is located radially inside the inner wall surface on the case side. In this battery, the terminal bolt rotates when the nut is fastened, and after the axial ridge of the bolt head comes into contact with the detent wall of the insulating member, the axial ridge of the bolt head is the detent wall. Of the contact wall portions of the portions, the contact is not made with the inner wall surface on the case side, but only with the inner wall surface on the outer side. Alternatively, when the axial ridge of the bolt head first abuts on the inner wall surface on the outer side of the contact wall portion of the detent wall portion, and then the detent wall portion is deformed radially outward, the abutment wall portion It also comes into contact with the inner wall surface on the case side.

The allowable amount of deformation of the detent wall portion in the radial direction at the time of fastening the nut is small at the portion forming the inner wall surface on the case side near the bottom wall portion and large at the portion forming the inner wall surface on the outer side away from the bottom wall portion. For this reason, in the above-mentioned battery, when the nut is fastened, the axial ridge portion of the bolt head comes into contact with the inner wall surface on the case side of the contact wall portion of the detent wall portion from the beginning. Even if the axial ridge of the bolt head abuts on the contact wall of the detent wall, the insulating member is unlikely to be damaged. Therefore, when the nut is fastened, the axial ridge of the bolt head is brought into contact with the detent wall of the insulating member to prevent the terminal bolts from rotating together, but the insulating member is prevented from being damaged. can do.

It is a perspective view of the assembled battery which concerns on embodiment. It is a vertical sectional view of the assembled battery which concerns on embodiment. It is an exploded perspective view near the positive electrode terminal in the assembled battery which concerns on embodiment. FIG. 5 is a cross-sectional view (BB cross-sectional view in FIG. 5) of a positive electrode terminal or the like according to an embodiment. It is a vertical sectional view (AA sectional view in FIG. 4) of a positive electrode terminal and the like which concerns on embodiment. It is explanatory drawing which shows the state of the positive electrode terminal bolt and the insulating member after the nut is fastened which concerns on embodiment. It is explanatory drawing which shows the state that the nut was fastened with the positive electrode terminal bolt tilted in relation to the embodiment. It is a cross-sectional view which corresponds to FIG. 4 which concerns on a modification 1 and corresponds to the positive electrode terminal and the like. It is a vertical cross-sectional view which corresponds to FIG. It is a cross-sectional view (DD cross-sectional view in FIG. 11) of an electrode terminal and the like which concerns on a comparative form. It is a vertical cross-sectional view (CC cross-sectional view in FIG. 10) of an electrode terminal and the like which concerns on a comparative form. It is explanatory drawing which shows the state of a terminal bolt and an insulating member after nut tightening which concerns on a comparative form.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of the assembled battery 100 according to the present embodiment. Further, FIG. 2 shows a vertical cross-sectional view of the battery 1 of the assembled batteries 100, and FIG. 3 shows an exploded perspective view of the vicinity of the positive electrode terminal 30. Further, FIGS. 4 to 6 show a cross-sectional view and a vertical cross-sectional view of the positive electrode terminal 30 and the like of the battery 1. In FIGS. 4 and 5, when the nut 130 is fastened to the positive electrode terminal bolt 70, the positive electrode terminal bolt 70 rotates, and the bolt head 71 abuts on the detent wall portion 53b of the insulating member 50. The state immediately after is shown. On the other hand, FIG. 6 shows a state in which the nut 130 has been fastened (a state in which the positive electrode terminal bolt 70 is further rotated than in the state of FIG. 5). In the following, the vertical direction BH, the horizontal direction CH, and the thickness direction DH of the battery 1 will be described as the directions shown in FIGS. 1 and 2.

The assembled battery 100 is mounted on a vehicle such as a hybrid car, a plug-in hybrid car, or an electric vehicle. In this assembled battery 100 (see FIG. 1), a plurality of (10 in the example of FIG. 1) square batteries 1 and a plurality of (9 in the example of FIG. 1) intervening members 110 alternate in the thickness direction DH. It is laminated on. The intervening member 110 has a rectangular plate shape and is made of an insulating resin. The intervening member 110 is formed with a plurality of concave grooves 110 m extending in the vertical direction BH of the battery 1. Each battery 1 is cooled by circulating a cooling medium such as air through these concave grooves 110 m. In the adjacent batteries 1, the positive electrode terminal 30 of one battery 1 and the negative electrode terminal 40 of the other battery 1 adjacent to the positive electrode terminal 30 are connected to each other via a rectangular plate-shaped connecting member 120, whereby the assembled battery 1 is assembled. The ten batteries 1 constituting the battery 100 are electrically connected in series.

The battery 1 (see FIGS. 1 to 3) includes a square battery case 10, a wound electrode body 20 housed therein, and electrode terminals (positive electrode terminal 30 and negative electrode terminal 30) supported by the battery case 10. The terminal 40) is composed of terminal bolts (positive electrode terminal bolt 70 and negative electrode terminal bolt 80) for connecting these electrode terminals 30 and 40 to the connecting member 120. Further, an insulating member (positive electrode insulating member 50 and negative electrode insulating member 60) is arranged between the battery case 10, the electrode terminals 30, 40 and the terminal bolts 70, 80, whereby the battery case 10 and the electrode terminal 30, Insulation is provided between 40 and the terminal bolts 70 and 80. Further, the electrolytic solution 17 is housed in the battery case 10, and a part of the electrolytic solution 17 is impregnated in the electrode body 20.

The battery case 10 has a rectangular parallelepiped box shape and is made of metal (aluminum in this embodiment). The battery case 10 is composed of a bottomed square cylindrical case body member 11 having an opening only on the upper side, and a rectangular plate-shaped case lid member 13 welded in a form of closing the opening of the case body member 11. Ru. Of the case lid member 13, rectangular through holes 13h and 13h are formed in the vicinity of both ends of the lateral CH, respectively. On the other hand (on the right side in FIG. 2), the insulating gasket 59 is inserted through the through hole 13h, and the positive electrode terminal 30 is further inserted through the through hole 59h of the insulating gasket 59. An insulating gasket 69 is inserted through the through hole 13h on the other side (left side in FIG. 2), and a negative electrode terminal 40 is inserted through the through hole 69h of the insulating gasket 69. The insulating gaskets 59 and 69 insulate between the case lid member 13 and the electrode terminals 30 and 40, and tightly seal the space between the case lid member 13 and the electrode terminals 30 and 40.

The electrode body 20 has a flat shape and is housed in the battery case 10 in a state of being laid on its side. In the electrode body 20, the strip-shaped positive electrode plate 21 and the strip-shaped negative electrode plate 25 are superposed on each other via a pair of separators 29 and 29 made of a strip-shaped and resin porous film, and are wound flat around the axis. Become. The positive electrode plate 21 has a positive electrode current collector foil 22 made of a strip-shaped aluminum foil. Of both main surfaces of the positive electrode current collector foil 22, a positive electrode active material layer (not shown) is formed in a band shape on a region extending in the width direction and the longitudinal direction of the positive electrode plate 21. One end of the positive electrode plate 21 in the width direction is a positive electrode exposed portion 21 m in which the positive electrode active material layer does not exist in the thickness direction and the positive electrode current collector foil 22 is exposed in the thickness direction. A positive electrode terminal 30 is welded to the positive electrode exposed portion 21m. The negative electrode plate 25 has a negative electrode current collector foil 26 made of a strip-shaped copper foil. Of both main surfaces of the negative electrode current collector foil 26, a negative electrode active material layer (not shown) is formed in a band shape on a region extending in the width direction and the longitudinal direction of the negative electrode plate 25, respectively. One end of the negative electrode plate 25 in the width direction is a negative electrode exposed portion 25 m in which the negative electrode active material layer does not exist in the thickness direction and the negative electrode current collector foil 26 is exposed in the thickness direction. A negative electrode terminal 40 is welded to the negative electrode exposed portion 25 m.

Next, the electrode terminals (positive electrode terminal 30 and negative electrode terminal 40) will be described (see FIGS. 4 and 5 in addition to FIGS. 1 to 3). The positive electrode terminal 30 and the negative electrode terminal 40 have basically the same configuration, but the positive electrode terminal 30 is made of aluminum and the negative electrode terminal 40 is made of copper. The positive electrode terminal 30 is connected to and conducts with the positive electrode exposed portion 21m of the positive electrode plate 21 of the electrode body 20 in the battery case 10, while penetrating the case lid member 13 and extending to the outside of the battery. Further, the negative electrode terminal 40 is connected to and conducts with the negative electrode exposed portion 25 m of the negative electrode plate 25 of the electrode body 20 inside the battery case 10, while penetrating the case lid member 13 and extending to the outside of the battery.

These electrode terminals 30 and 40 are composed of inner electrode terminal members 31, 41, outer electrode terminal members 35, 45, and terminal nuts 39, 49, respectively. The inner electrode terminal members 31, 41 extend from the inside of the battery case 10 to the outside. The inner electrode terminal members 31, 41 are composed of a main body portion 31a, 41a and a bolt portion 31b, 41b. Of these, the main body portions 31a and 41a are arranged in the battery case 10 and connected (welded) to the electrode body 20 (the positive electrode exposed portion 21 m of the positive electrode plate 21 or the negative electrode exposed portion 25 m of the negative electrode plate 25).

Further, the bolt portions 31b and 41b are the through holes 59h and 69h of the insulating gaskets 59 and 69 arranged in the through holes 13h and 13h of the case lid member 13 and the through holes 50h and 60h of the insulating members 50 and 60, and the outer electrodes. It extends to the outside of the battery through the first through holes 35h1, 45h1 of the terminal members 35 and 45. Terminal nuts 39 and 49 are fastened to the bolt portions 31b and 41b. As a result, the inner electrode terminal members 31, 41, the outer electrode terminal members 35, 45, and the terminal nuts 39, 49 are connected to form the electrode terminals 30, 40, and the electrode terminals 30, 40 are the insulating members 50, 60. And is fixed to the case lid member 13 via the insulating gaskets 59 and 69.

On the other hand, the outer electrode terminal members 35 and 45 are arranged entirely outside the battery case 10. The outer electrode terminal members 35, 45 are formed by bending a metal plate material in the thickness direction thereof, and include base portions 35a, 45a, external connection portions 35c, 45c, and intermediate portions 35b, 45b connecting them. It has a crank shape (Z shape). Of these, the bases 35a and 45a are plate-shaped and extend along the case lid member 13. The base portions 35a and 45a are provided with first through holes 35h1 and 45h1 through which the bolt portions 31b and 41b of the above-mentioned inner electrode terminal members 31 and 41 are inserted.

Further, the intermediate portions 35b and 45b bend from the ends of the base portions 35a and 45a and extend in a direction away from the case lid member 13. Further, the external connection portions 35c and 45c are portions connected to the connecting member 120 outside the battery, and are plate-shaped and extend in parallel with the base portions 35a and 45a. Second through holes 35h2 and 45h2 are provided in the external connection portions 35c and 45c. The bolt shaft portions 73 and 83 of the terminal bolts 70 and 80 are inserted into the second through holes 35h2 and 45h2, and the bolt heads 71 and 81 are engaged from the case lid member 13 side.

Next, terminal bolts (positive electrode terminal bolt 70 and negative electrode terminal bolt 80) will be described (see FIGS. 4 and 5 in addition to FIGS. 1 to 3). The terminal bolts 70 and 80 are composed of bolt heads 71 and 81 having a polygonal columnar shape (square columnar shape in the present embodiment) and bolt shaft portions 73 and 83 having male screws formed on the outer periphery thereof. Of these, the bolt heads 71 and 81 have their top surfaces 71c and 81c facing the battery case side BK, and the insulating members 50 and 60 and the external connection portions of the outer electrode terminal members 35 and 45 of the electrode terminals 30 and 40. It is arranged between 35c and 45c. On the other hand, the bolt shaft portions 73 and 83 penetrate the outer electrode terminal members 35 and 45 from the bolt heads 71 and 81 (inserted into the second through holes 35h2 and 45h2 of the external connection portions 35c and 45c). It extends to the battery outer side BS (in FIG. 2, FIG. 3 and FIG. 5, upward, above the vertical BH).

In the state where the assembled battery 100 is configured, the bolt shaft portions 73 and 83 of the terminal bolts 70 and 80 penetrate the outer electrode terminal members 35 and 45 (insert into the second through holes 35h2 and 45h2 of the external connection portions 35c and 45c). ) Further, it penetrates the connecting member 120 (it is inserted into the through hole 120h of the connecting member 120). The nuts 130 and 140 are fastened to the bolt shafts 73 and 83. As a result, the external connecting portions 35c and 45c of the outer electrode terminal members 35 and 45 and the connecting member 120 are sandwiched between the bolt heads 71 and 81 and the nuts 130 and 140, and the outer electrode terminal members 35 and 45 are sandwiched between the bolt heads 71 and 81 and the connecting members 120. And the connecting member 120 are connected. In this way, the positive electrode terminal 30 of one of the adjacent batteries 1 and the negative electrode terminal 40 of the other battery 1 are electrically connected in series via the connecting member 120.

Next, the insulating members (positive electrode insulating member 50 and negative electrode insulating member 60) will be described (see FIGS. 4 and 5 in addition to FIGS. 1 to 3). The insulating members 50 and 60 are made of an insulating resin, and include a case lid member 13 of the battery case 10, outer electrode terminal members 35 and 45 of the electrode terminals 30 and 40, and bolt heads 71 and 81 of the terminal bolts 70 and 80. The case lid member 13, the outer electrode terminal members 35, 45, and the bolt heads 71, 81 are insulated from each other. These insulating members 50 and 60 are integrally formed with the detent recesses 53 and 63 and the detent recesses 53 and 63, and are formed from the detent recesses 53 and 63 in the longitudinal direction (lateral CH) of the case lid member 13. It is composed of extending flat plate portions 51 and 61.

Of these, the flat plate portions 51 and 61 have a rectangular plate shape and are arranged between the case lid member 13 and the base portions 35a and 45a of the outer electrode terminal members 35 and 45. The flat plate portions 51 and 61 are provided with rectangular through holes 50h and 60h. As described above, the insulating gaskets 59 and 69 are inserted into the through holes 50h and 60h, and the bolt portions 31b of the inner electrode terminal members 31 and 41 are further inserted into the through holes 59h and 69h of the insulating gaskets 59 and 69. 41b is inserted.

The detent recesses 53 and 63 are composed of bottom wall portions 53a and 63a and detent wall portions 53b and 63b. The bottom wall portions 53a and 63a have a rectangular plate shape, and are arranged between the case lid member 13 and the bolt heads 71 and 81 of the terminal bolts 70 and 80.
Further, the detent wall portions 53b, 63b extend from the peripheral edges of the bottom wall portions 53a, 63a to the battery outer side BS, and are located on the radial outer FB of the bolt heads 71, 81, and the bolt heads 71, 81. Surrounds the radial outer FB over the entire circumference. The detent wall portions 53b and 63b have a square shape (mouth shape) when viewed from above (battery outer side BS).

The diameter of the smallest inscribed circle Cn (see FIG. 4) inscribed in the inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b when viewed from above (BS on the outer side of the battery) is defined as the diameter Dn. On the other hand, the diameter of the inscribed circle Cm1 inscribed in the outer peripheral surfaces 71m and 81m of the bolt heads 71 and 81 when viewed from above (BS on the outer side of the battery) is defined as the diameter Dm1. Further, the diameter of the circumscribed circle Cm2 circumscribing the outer peripheral surfaces 71m and 81m of the bolt heads 71 and 81 is defined as the diameter Dm2.
The detent wall portions 53b and 63b and the bolt heads 71 and 81 have a relationship in which the diameter Dn is larger than the diameter Dm1 (Dn> Dm1). As a result, the bolt heads 71 and 81 can be inserted into the detent recesses 53 and 63 (the radial inner FA of the detent wall portions 53b and 63b), and the inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b can be inserted. , A gap is provided between the outer peripheral surfaces 71m and 81m of the bolt heads 71 and 81.

On the other hand, the detent wall portions 53b and 63b and the bolt heads 71 and 81 have a relationship in which the diameter Dn is smaller than the diameter Dm2 (Dn <Dm2). As a result, the bolt heads 71 and 81 can rotate over a predetermined angle range in the detent recesses 53 and 63, but among the bolt heads 71 and 81, the four axial ridges 71r extending in the bolt axial direction EH , 81r abut on the inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b, respectively, so that the rotation of the bolt heads 71 and 81 by a predetermined angle or more is restricted (the co-rotation of the terminal bolts 70 and 80 is restricted. To be prevented).

Of the detent wall portions 53b and 63b, the portions where the four axial ridges 71r and 81r of the bolt heads 71 and 81 abut are the abutment wall portions 53t and 63t, respectively. Further, among the inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b, the portions forming the contact wall portions 53t and 63t are referred to as the contact inner wall surfaces 53tn and 63tn. Therefore, the axial ridges 71r and 81r of the bolt heads 71 and 81 abut on the contact inner wall surfaces 53tn and 63tn of the contact wall portions 53t and 63t.

The inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b of the present embodiment (see FIGS. 4 and 5) have the outer wall surfaces 53nj and 63nj located on the battery outer side BS over the entire circumference. It is located on the inner FA in the radial direction from the inner wall surfaces 53ni and 63ni on the case side located on the battery case side BK. More specifically, the inner wall surfaces 53n and 63n of the detent wall portions 53b and 63b are configured to be located on the inner FA in the radial direction as much as the battery outer side BS over the entire circumference.

As described above, in the detent wall portions 53b and 63b of the present embodiment, the outer side inner wall surfaces 53nj and 63nj of the inner wall surfaces 53n and 63n are located on the inner FA in the radial direction from the case side inner wall surfaces 53ni and 63ni over the entire circumference. It is in the form of Therefore, even in the contact wall portions 53t and 63t of the detent wall portions 53b and 63b, the outer side inner wall surfaces 53tnj and 63tnj have a diameter larger than that of the case side inner wall surfaces 53tni and 63tni among the contact inner wall surfaces 53tn and 63tn. It is located in the FA inside the direction.

In this battery 1, when the nuts 130 and 140 are fastened to the terminal bolts 70 and 80, the terminal bolts 70 and 80 rotate clockwise in FIG. 4, and the axial ridges 71r and 81r of the bolt heads 71 and 81r. Abuts on the anti-rotation wall portions 53b and 63b. At that time, the axial ridges 71r and 81r of the bolt heads 71 and 81 first have the outer inner wall surfaces 53tnj and 63tnj of the battery outer side BS among the contact wall portions 53t and 63t of the detent wall portions 53b and 63b. (See FIG. 5). After that, when the nuts 130 and 140 are further tightened and the terminal bolts 70 and 80 are rotated, the detent wall portions 53b and 63b are deformed and expanded in the radial outer FB (see FIG. 6). Then, when the terminal bolts 70 and 80 rotate by a predetermined angle, the axial ridges 71r and 81r of the bolt heads 71 and 81 finally become the contact wall portions 53t and 63t of the detent wall portions 53b and 63b. Of these, the inner wall surfaces 53tni and 63tni on the case side, which are located closer to the battery case side BK than the inner wall surfaces 53tnj and 63tnj on the outer side, also come into contact with each other (see FIG. 6). That is, the axial ridges 71r and 81r of the bolt heads 71 and 81 make line contact with the contact inner wall surfaces 53tn and 63tn of the contact wall portions 53t and 63t of the detent wall portions 53b and 63b.

The allowable amount of deformation of the detent wall portions 53b and 63b to the radial outer FB at the time of fastening the nuts 130 and 140 is small at the portion forming the case side inner wall surface 53ni and 63ni near the bottom wall portions 53a and 63a, and the bottom wall. The portion forming the outer inner wall surface 53nj, 63nj away from the portions 53a, 63a is large. Therefore, in this battery 1, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are the cases of the contact wall portions 53t and 63t of the detent wall portions 53b and 63b from the beginning. Compared to the battery in the form of contacting the side inner wall surface 53tni, 63tni, the axial ridges 71r, 81r of the bolt heads 71, 81 are the contact wall portions of the detent wall portions 53b, 63b when the nuts 130, 140 are fastened. Even if they come into contact with 53t and 63t, the insulating members 50 and 60 are unlikely to be damaged. Therefore, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are brought into contact with the detent wall portions 53b and 63b of the insulating members 50 and 60, and the terminal bolts 70 and 80 rotate together. It is possible to obtain the assembled battery 100 in which damage to the insulating members 50 and 60 is suppressed while preventing the above.

By the way, when the nuts 130 and 140 are fastened to the terminal bolts 70 and 80, the terminal bolts 70 and 80 may be in an inclined state (see FIG. 7). In this case, on the side where the terminal bolts 70 and 80 are tilted (on the right side in FIG. 7), the axial ridges 71r and 81r of the bolt heads 71 and 81 are the contact wall portions of the detent wall portions 53b and 63b. Of the 53t and 63t, only the inner wall surface 53tnj and 63tnj on the outer side of the BS on the outer side of the battery are in point contact.

On the other hand, on the opposite side (left side in FIG. 7), the axial ridges 71r and 81r of the bolt heads 71 and 81 are in the contact of the contact wall portions 53t and 63t of the detent wall portions 53b and 63b. Line contact with the wall surfaces 53tn and 63tn (line contact with the outer side inner wall surfaces 53tnj and 63tnj and the case side inner wall surfaces 53tni and 63tni).
As described above, in the battery 1 of the present embodiment, even when the terminal bolts 70 and 80 are tilted, the axial ridges 71r and 81r of the bolt heads 71 and 81 are the contact wall portions of the detent wall portions 53b and 63b. Of the 53t and 63t, only the inner wall surface 53tni and 63tni on the case side are prevented from coming into contact with each other. Therefore, in this battery 1, even if the terminal bolts 70 and 80 are tilted when the nuts 130 and 140 are fastened, the insulating members 50 and 60 are unlikely to be damaged.

(Deformation form 1)
Next, a modified form 1 of the above embodiment will be described (see FIG. 8). In each battery 1 constituting the assembled battery 100 according to the embodiment, the detent wall portions 53b and 63b of the insulating members 50 and 60 are covered by the outer wall surfaces 53nj and 63nj among the inner wall surfaces 53n and 63n over the entire circumference. It is configured to be located on the inner FA in the radial direction from the inner wall surface 53ni and 63ni on the case side (see FIGS. 4 and 5).

On the other hand, in each battery 2 constituting the assembled battery 102 according to the present modification 1, the insulating members 250 and 260 also have the bottom wall portions 253a and 263a and the detent wall portions 253b including the inner wall surfaces 253n and 263n. It has detent recesses 253 and 263 made of 263b (see FIG. 8). However, in the present modification 1, only in the four contact wall portions 253t and 263t of the detent wall portions 253b and 263b, with respect to the contact inner wall surface 253tn and 263tun, the outer side inner wall surface 253tnj of the battery outer side BS. The 263tnj is located on the inner FA in the radial direction from the inner wall surface 253tni and 263tni on the case side, which are located on the battery case side BK.

Even in this battery 2, when the nuts 130 and 140 are fastened to the terminal bolts 70 and 80, the terminal bolts 70 and 80 rotate, and the axial ridges 71r and 81r of the bolt heads 71 and 81 become the detent wall portion 253b. , 263b. At that time, the axial ridges 71r and 81r of the bolt heads 71 and 81 first abut on the outer inner wall surface 253tnj and 263tnj of the contact wall portions 253t and 263t of the detent wall portions 253b and 263b. After that, when the nuts 130 and 140 are further tightened and the terminal bolts 70 and 80 are rotated, the detent wall portions 253b and 263b are deformed and expanded to the radial outer FB, and finally the shafts of the bolt heads 71 and 81. The directional ridges 71r and 81r also abut on the inner wall surface 253tni and 263tni on the case side of the contact wall portions 253t and 263t of the detent wall portions 253b and 263b.

Therefore, even in this battery 2, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are the cases of the contact wall portions 253t and 263t of the detent wall portions 253b and 263b from the beginning. Compared to the battery in the form of contacting the side inner wall surface 253tni, 263tni, the axial ridges 71r, 81r of the bolt heads 71, 81 are the contact wall portions of the detent wall portions 253b, 263b when the nuts 130, 140 are fastened. Even if it comes into contact with 253t and 263t, the insulating members 250 and 260 are unlikely to be damaged. Therefore, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are brought into contact with the detent wall portions 253b and 263b of the insulating members 250 and 260, and the terminal bolts 70 and 80 rotate together. It is possible to use the assembled battery 102 in which damage to the insulating members 250 and 260 is suppressed while preventing the above.

(Deformation form 2)
Next, a modified form 2 of the above embodiment will be described (see FIG. 9). In each battery 1 constituting the assembled battery 100 according to the embodiment, the detent wall portions 53b, 63b of the insulating members 50, 60 are located in the radial inner FA as the inner wall surfaces 53n, 63n thereof are closer to the battery outer side BS. (See Fig. 5). As a result, the detent wall portions 53b and 63b are formed so that the outer side inner wall surfaces 53nj and 63nj are located on the inner side FA in the radial direction with respect to the case side inner wall surfaces 53ni and 63ni among the inner wall surfaces 53n and 63n.

On the other hand, in each battery 3 constituting the assembled battery 103 according to the present modification 2, the insulating members 350 and 360 also have the bottom wall portions 353a and 363a and the detent wall portions 353b including the inner wall surfaces 353n and 363n. It has detent recesses 353 and 363 made of 363b (see FIG. 9). However, in the present modification 2, the annular convex portions 353f and 363f protruding toward the radial inner FA are provided at the portion of the battery outer side BS in the detent wall portions 353b and 363b. As a result, the detent wall portions 353b and 363b are configured such that, of the inner wall surfaces 353n and 363n, the outer side inner wall surfaces 353nj and 363nj are located on the inner FA in the radial direction with respect to the case side inner wall surfaces 353ni and 363ni.

In the detent wall portions 353b and 363b of the present modified form 2, the outer side inner wall surfaces 353nj and 363nj of the inner wall surfaces 353n and 363n are located on the inner side FA in the radial direction from the case side inner wall surfaces 353ni and 363ni over the entire circumference. It is in the form. Therefore, in the contact wall portions 353t and 363t of the detent wall portions 353b and 363b, of the contact inner wall surfaces 353tn and 363tn, the outer side inner wall surfaces 353tnj and 363tnj have a diameter larger than that of the case side inner wall surfaces 353tni and 363tni. It is located in the FA inside the direction.

Even in this battery 3, when the nuts 130 and 140 are fastened to the terminal bolts 70 and 80, the terminal bolts 70 and 80 rotate, and the axial ridges 71r and 81r of the bolt heads 71 and 81 become the detent wall portion 353b. , 363b. At that time, the axial ridges 71r and 81r of the bolt heads 71 and 81 first abut on the outer inner wall surface 353tnj and 363tnj of the contact wall portions 353t and 363t of the detent wall portions 353b and 363b. After that, when the nuts 130 and 140 are further tightened and the terminal bolts 70 and 80 are rotated, the detent wall portions 353b and 363b are deformed and expanded to the radial outer FB, and finally the shafts of the bolt heads 71 and 81 are expanded. The directional ridges 71r and 81r also abut on the inner wall surface 353tni and 363tni on the case side of the contact wall portions 353t and 363t of the detent wall portions 353b and 363b.

Therefore, even in this battery 3, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are the cases of the contact wall portions 353t and 363t of the detent wall portions 353b and 363b from the beginning. Compared to the battery in the form of contacting the side inner wall surface 353tni, 363tni, the axial ridges 71r, 81r of the bolt heads 71, 81 are the contact wall portions of the detent wall portions 353b, 363b when the nuts 130, 140 are fastened. Even if it comes into contact with 353t and 363t, the insulating members 350 and 360 are unlikely to be damaged. Therefore, when the nuts 130 and 140 are fastened, the axial ridges 71r and 81r of the bolt heads 71 and 81 are brought into contact with the detent wall portions 353b and 363b of the insulating members 350 and 360 to rotate the terminal bolts 70 and 80 together. It is possible to obtain the assembled battery 103 in which damage to the insulating members 350 and 360 is suppressed while preventing the above.

In the above, the present invention has been described in accordance with the embodiments and modifications 1 and 2, but the present invention is not limited to the above-described embodiments and variants 1 and 2, and is not deviating from the gist thereof. Needless to say, it can be changed and applied as appropriate.
For example, in the modified form 2, the annular convex portions 353f and 363f protruding toward the inner FA in the radial direction are provided on the portion of the battery outer side BS among the detent wall portions 353b and 363b, but the present invention is limited to this. No. Only the four contact wall portions 353t and 363t out of the detent wall portions 353b and 363b are provided with convex portions protruding to the radial inner FA, and at each contact wall portion 353t and 363t, the outside of the battery outer side BS is provided. The side inner wall surface 353tnj, 363tnj may be located on the radial inner FA than the case side inner wall surface 353tni, 363tni located on the battery case side BK.

1,2,3 Battery 10 Battery case 20 Electrode body 30 Positive electrode terminal (electrode terminal)
40 Negative electrode terminal (electrode terminal)
31,41 Inner electrode terminal member 35,45 Outer electrode terminal member 39,49 Terminal nut 50, 250,350 Positive electrode insulating member (insulating member)
60, 260, 360 Negative electrode insulating member (insulating member)
53, 63, 253, 263, 353, 363 Anti-rotation recesses 53a, 63a, 253a, 263a, 353a, 363a Bottom wall 53b, 63b, 253b, 263b, 353b, 363b Anti-rotation wall 53n, 63n, 253n, 263n , 353n, 363n Inner wall surface 53ni, 63ni, 353ni, 363ni Case side inner wall surface 53nj, 63nj, 353nj, 363nj (inner wall surface) outer side inner wall surface 53t, 63t, 253t, 263t, 353t, 363t Contact wall portion 53tn, 63tn, 253tn, 263tn, 353tn, 363tn Contact inner wall surface 53tni, 63tni, 253tni, 263tni, 353tni, 363tni Case side inner wall surface 53tnj, 63tnj, 253tnj, 253tnj 363tnj (on the inner wall surface of contact) External inner wall surface 70 Positive electrode terminal bolt (terminal bolt)
80 Negative electrode terminal bolt (terminal bolt)
71,81 Bolt head 71r 81r Axial ridge 73,83 Bolt shaft 100, 102, 103 Assembly battery 120 Connecting member 130, 140 Nut BS Battery outer side BK Battery case side EH Bolt Axial FA Radial inner FB diameter Outside direction

Claims (1)

With a battery case,
The outer electrode terminal member arranged outside the battery case and
Includes a polygonal columnar bolt head arranged between the battery case and the outer electrode terminal member, and a bolt shaft portion extending from the bolt head to the outside of the battery through the outer electrode terminal member. With terminal bolts
An insulating member made of an insulating resin, arranged between the battery case, the outer electrode terminal member, and the bolt head, and insulating between the battery case, the outer electrode terminal member, and the bolt head. With multiple batteries,
A nut is fastened to the bolt shaft portion that penetrates the outer electrode terminal member and the connecting member, the outer electrode terminal member is connected to the connecting member, and the batteries are electrically connected to each other via the connecting member. It is a built-in battery
The above insulating member
The bottom wall portion arranged between the battery case and the bolt head,
It has a detent wall portion that extends from the bottom wall portion to the outside of the battery and is located around the radial direction of the bolt head to regulate the co-rotation of the bolt head.
The above detent wall is
Includes a contact wall portion to which the axial ridge extending in the bolt axial direction of the bolt head abuts when the terminal bolt rotates with the tightening of the nut.
The abutment wall is
Of the contact inner wall surface, which is the inner wall surface, the outer inner wall surface located on the outer side of the battery is located radially inside the inner wall surface on the case side located on the battery case side. Assembled battery.

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