Battery terminal and battery using same

Abstract

To provide a battery terminal that is strong against stress, and a battery using the battery terminal.SOLUTION: In a battery terminal according to the disclosed technology has a two-piece configuration made of different types of conductive materials, a first piece on the outside and a second piece 15 disposed on the inside and having a current collecting portion 20 are fixed at two places of a first fixing portion 17 and a second fixing portion 18, the first fixing portion 17 is between the current collecting portion 20 and the second fixing portion 18 with respect to the longitudinal direction of the shape of the terminal, and in the short direction, the bias of the current collecting portion 20 toward the center and the bias of the first fixing portion 17 toward the center are opposite to each other.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a battery terminal. The present disclosure also relates to a battery using the battery terminal. [Background technology]

[0002] Conventionally, batteries have used terminals that penetrate holes provided in the exterior body. In the battery described in Patent Document 1, the terminals are arranged in the exterior body so as to penetrate the holes. In this state, an insulating material is integrally formed so as to fill the gap between the terminals and the holes in the exterior body. The terminals are connected to the electrode body inside the exterior body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-86813 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional technology described above, the terminals could be damaged because, after being placed in the holes in the exterior body, the terminals are subjected to thermal stress when the busbar is joined, or vibration stress while the vehicle is running after being mounted on it. In particular, when the terminal itself is a two-piece structure in which two parts are joined together, stress tends to concentrate at the joint between the pieces.

[0005] The present disclosure has been made to solve the problems of the conventional techniques described above. That is, the object of the disclosure is to provide a battery terminal that is resistant to stress, and a battery using the battery terminal. [Means for solving the problem]

[0006] A battery terminal according to one aspect of the disclosed technique is a terminal member that connects a power generating element disposed inside an exterior body of a battery to an external conductive member disposed outside the exterior body, and has a two-piece structure having a first piece and a second piece made of different conductive materials, the first piece having a first plate-shaped portion having a first surface and a second surface, disposed so that the first surface faces outward in the battery and connected to the external conductive member, and a first fixing portion and a second fixing portion provided on the second surface of the first plate-shaped portion and fixing the second piece, the second piece having the first surface and the second surface, and having a shape having a long length direction and a short length direction in a plan view, and the first the second plate-shaped portion is disposed with its front surface facing the second surface of the first plate-shaped portion and has a first hole portion and a second hole portion formed therein; and a current collecting portion is provided connected to a position offset from the center in both the long dimension direction and the short dimension direction on the second surface of the second plate-shaped portion and connected to a power generating element, the first fixing portion has a first columnar portion located within the first hole portion and a first umbrella portion that extends to a larger diameter than the first columnar portion on the second surface of the second plate-shaped portion, the second fixing portion has a second columnar portion located within the second hole portion and a second umbrella portion that extends to a larger diameter than the second columnar portion on the second surface of the second plate-shaped portion, and at least a part of the first umbrella portion and at least a part of the second umbrella portion are Only the former Or, both are joined to the second surface of the second plate-shaped portion, the center of the first hole portion is between the center of the root of the current collecting portion and the center of the second hole portion in the long dimension direction of the second plate-shaped portion, the center of the root of the current collecting portion is offset with respect to the center in the short dimension direction of the second plate-shaped portion, and the center of the first hole portion is offset in the opposite direction to the offset of the center of the root of the current collecting portion. At the same time, the amount of deviation of the center of the first hole portion is within a range in which the moment of a vertical force pulling the second piece downward due to the weight of the power generating element after the power generating element is attached to the current collecting portion and before the power generating element is inserted into the exterior body does not cause damage to the joint between the first umbrella portion and the second surface. It is something.

[0007] In the battery terminal of the above embodiment, the first piece of the two-piece configuration is disposed so that a portion of the battery faces outward, and the second piece is disposed inside the exterior body of the battery. The first plate-shaped portion of the first piece and the second plate-shaped portion of the second piece are fixed by the first and second fixing portions provided in the first plate-shaped portion and the first and second holes provided in the second plate-shaped portion. The bias of the current collecting portion and the bias of the first fixing portion are opposite to each other in the short direction of the second plate-shaped portion, so that the joint between the first piece and the second piece is resistant to stress.

[0008] In the battery terminal according to the above aspect, it is further preferable that the center of the second hole is offset in a direction opposite to the offset of the center of the root of the current collecting part with respect to the center of the second plate-shaped part in the short length direction. By making not only the first fixing part but also the second fixing part offset in a direction opposite to the offset of the current collecting part, the resistance to stress is further improved.

[0009] A battery according to one aspect of the disclosed technology has an exterior body, a power generating element housed inside the exterior body, and terminals connected to the power generating element, and uses any of the battery terminals described above as at least one of the terminals. The high stress resistance of the battery terminal also results in high reliability as a battery.

[0010] In the battery according to the above aspect, it is further preferable that a bus bar for connecting to other batteries is joined to the terminal. Since stress is also applied to the battery terminal when the bus bar is joined, it is significant to use a battery terminal with high stress resistance. Effect of the Invention

[0011] According to the disclosed technique, a battery terminal that is resistant to stress and a battery using the battery terminal are provided. [Brief description of the drawings]

[0012] [Figure 1] 1 is an external perspective view of a battery according to an embodiment; [Diagram 2] 2 is a perspective view of a lid and an external terminal of the battery in FIG. 1. [Diagram 3] FIG. 2 is a perspective view of a battery terminal according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view (part 1) of the battery terminal in FIG. 3. [Diagram 5] FIG. 4 is a bottom view of the battery terminal of FIG. 3. [Figure 6] FIG. 4 is a cross-sectional view (part 2) of the battery terminal in FIG. 3. [Figure 7] FIG. 4 is a perspective view showing the second piece alone. [Figure 8]11 is a schematic diagram illustrating a state in which a downward force is applied to the second piece. FIG. [Figure 9] 11 is a schematic diagram illustrating a state in which an outward force is applied to the second piece. FIG. [Figure 10] 13 is a graph showing a simulation result regarding the magnitude of a moment acting on a fixed portion. [Figure 11] FIG. 1 is a perspective view showing a battery stack using a bus bar. [Figure 12] FIG. 4 is a cross-sectional view showing a state during welding of the bus bar. [Figure 13] FIG. 11 is a bottom view of a battery terminal according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. This embodiment is an embodiment of the present disclosure as a battery terminal used in a terminal portion of a battery and a battery using the same. A battery 1 according to this embodiment is generally configured by housing a power generating element 3 inside an exterior body 2, as shown in FIG.

[0014] The exterior body 2 is composed of a box body 4 and a lid body 5. The battery 1 has an overall outer shape of a flat rectangular plate. Positive and negative external terminals 6, 7 are provided near both ends of the upper lid body 5 in the longitudinal direction. Battery terminals 8, 9 are attached to the external terminals 6, 7, respectively, with insulating material 10 interposed therebetween. The battery terminals 8, 9 of the external terminals 6, 7 are connected to the positive and negative electrode plates of the power generating element 3 inside the exterior body 2, respectively. A bus bar 11, which will be described later, is attached to the battery terminals 8, 9 of the battery 1 in FIG. 1.

[0015] Fig. 2 shows the lid body 5 and external terminals 6, 7 of the battery 1 shown in Fig. 1. What is shown in Fig. 2 is the stage where the battery terminals 8, 9 are attached to the lid body 5 and fixed with an insulating material 10. Holes are actually made in the lid body 5 at the locations of the external terminals 6, 7, and the battery terminals 8, 9 are disposed passing through the holes. The power generating element 3 is attached to the lower ends 12, 13 of the battery terminals 8, 9 in Fig. 2. The power generating element 3 is then housed in a box body 4 and the lid body 5 is joined to the box body 4 to obtain the battery 1 of Fig. 1.

[0016] Of the battery terminals 8, 9, the battery terminal 8, which is for the negative electrode, is shown in Figure 3. The battery terminal 8 is a two-piece configuration having an upper first piece 14 and a lower second piece 15. The first piece 14 and the second piece 15 are made of different conductive materials. Here, the first piece 14 is made of aluminum and the second piece 15 is made of copper. The lower end portion 12 connected to the power generating element 3 is part of the second piece 15.

[0017] A cross-sectional view of the battery terminal 8 is shown in Fig. 4. Fig. 4 is a cross-sectional view of the AA portion in Fig. 3. This cross section is parallel to the short side of the lid body 5. As shown in Fig. 4, in the battery terminal 8, the first piece 14 has a first plate-shaped portion 16 and a fixing portion 17, and the second piece 15 has a second plate-shaped portion 19 and a current collecting portion 20.

[0018] With regard to the first piece 14, a first surface 21 of the first plate-shaped portion 16 is the surface facing outward in the battery 1. The fixing portion 17 is a portion that is not visible in FIG. 3, but is a portion for fixing the second piece 15 to the first piece 14. The fixing portion 17 is provided on a second surface 22 of the first plate-shaped portion 16. The first plate-shaped portion 16 is also a portion that is connected to the bus bar 11.

[0019] With regard to the second piece 15, the second plate-shaped portion 19 is a plate-shaped portion overlapping the first plate-shaped portion 16. The first surface 23 of the second plate-shaped portion 19 faces the second surface 22. The current collecting portion 20 is provided so as to extend downward from the second surface 24 of the second plate-shaped portion 19. The lower end portion 12 of the current collecting portion 20 is a portion to be connected to the negative electrode plate of the power generating element 3.

[0020] A bottom view of the battery terminal 8 as viewed from below is shown in Fig. 5. The up-down direction in Fig. 5 is the long dimension direction of the second plate-shaped portion 19, which is parallel to the long side of the lid body 5. The left-right direction in Fig. 5 is the short dimension direction of the second plate-shaped portion 19, which is parallel to the short side of the lid body 5. As can be seen from Fig. 5, the current collecting portion 20 is connected to a position offset to one side from the center of the second plate-shaped portion 19 in both the long dimension direction and the short dimension direction.

[0021] FIG. 6 shows another cross-sectional view of the battery terminal 8. FIG. 6 is a cross-sectional view of the portion BB in FIG. 4. This cross-section is parallel to the long side of the cover body 5. FIG. 7 shows the second piece 15 as a single piece. As can be seen from FIGS. 5 and 6, the fixing portion 17 shown in FIG. 4 actually has two fixing portions, a first fixing portion 17 and a second fixing portion 18. The first fixing portion 17 and the second fixing portion 18 are arranged side by side in the longitudinal direction of the first plate-shaped portion 16 (the same as the longitudinal direction of the second plate-shaped portion 19).

[0022] 6 and 7, a first hole 25 and a second hole 26 are formed in the second plate-shaped portion 19. The first hole 25 and the second hole 26 are portions through which the first fixing portion 17 and the second fixing portion 18 pass, respectively. The first fixing portion 17 has a first columnar portion 27 and a first umbrella portion 28, and the second fixing portion 18 has a second columnar portion 29 and a second umbrella portion 30.

[0023] The first columnar section 27 and the second columnar section 29 are portions located inside the first hole section 25 and the second hole section 26, respectively. The first umbrella section 28 and the second umbrella section 30 are portions that extend to a larger diameter on the second surface 24 than the first columnar section 27 and the second columnar section 29, respectively. The first umbrella section 28 and the second umbrella section 30 are connected to the second surface 22 via the first columnar section 27 and the second columnar section 29, respectively.

[0024] The first fixing part 17 and the second fixing part 18 originally had only the first columnar part 27 and the second columnar part 29, without the first umbrella part 28 and the second umbrella part 30, and were longer than the thickness of the second plate-like part 19, that is, riveted. The first surface 23 was superimposed on the second surface 22, and then the first umbrella part 28 and the second umbrella part 30 were formed by riveting to be integrated as the battery terminal 8. The first piece 14 is made of aluminum, so riveting is easy. After riveting, at least a part of either or both of the first umbrella part 28 and the second umbrella part 30 is joined to the second surface 24 by ultrasonic joining or the like. The joint 31 between the second surface 24 and the first umbrella part 28 or the second umbrella part 30 is shown by a thick line in FIG. 4 (when the first umbrella part 28 is joined) and FIG. 6 (when both are joined).

[0025] 5, the center 32 of the base of the current collecting portion 20, the center 33 of the first hole portion 25, and the center 34 of the second hole portion 26 are shown overlapping each other. The positional relationship between these three central positions will be explained. There are two positional relationships between these three central positions: a positional relationship in the long dimension direction (up-down direction) of the second plate-shaped portion 19, and a positional relationship in the short dimension direction (left-right direction).

[0026] The positional relationship in the longitudinal direction will be described. In the longitudinal direction, the center 33 of the first hole 25 is between the center 32 of the base of the current collecting part 20 and the center 34 of the second hole 26. In FIG. 5, from the top, the order is center 32, center 33, center 34. This means that the first fixing part 17 and the second fixing part 18 are in different positions in the longitudinal direction. Since the joint points between the first piece 14 and the second piece 15 are arranged in different positions in the longitudinal direction, this is advantageous in terms of joint strength compared to a case where the joint points are located close to each other.

[0027] The positional relationship in the short length direction will be explained. First, as described above, center 32 of the base of current collecting portion 20 is positioned offset to one side from center C in the short length direction. In FIG. 5, center 32 is offset to the left of center C. In contrast, center 33 of first hole portion 25 is offset in the opposite direction from center 32 with respect to center C. In FIG. 5, center 33 is offset to the right of center C. Furthermore, in FIG. 5, center 34 of second hole portion 26 is also offset to the right like center 33.

[0028] The significance of the center 32 of the base of the current collecting portion 20 and the center 33 of the first hole portion 25 being offset in opposite directions with respect to the center C will now be described. The significance of this offset is to reduce stress applied to the battery terminal 8 in a later process. In a later process, a force may be applied to the battery terminal 8 relative to the second piece 15. For example, as shown in FIG. 8, a vertical force G may be applied that pulls the second piece 15 downward. In this case, a counterclockwise moment MA in FIG. 8 is generated relative to the first fixing portion 17. For example, after the power generating element 3 is attached, box body 4 Before the power generating element 3 is inserted into the housing, the weight of the power generating element 3 may cause the situation shown in FIG. 8. Alternatively, as shown in FIG. 9, a horizontal force F may be applied that tends to tilt the second piece 15 outward. In this case, a counterclockwise moment MB in FIG. 9 is generated with respect to the first fixing portion 17. For example, when the power generating element 3 is box body 4 When inserting the connector into the connector, the situation shown in Figure 9 may occur.

[0029] The magnitudes of the moments MA and MB in these cases are greatly affected by the arrangement of the center 33 of the first hole 25 in the short length direction. This is because the distance of the center 33 from the fulcrum position is affected by the position of the center 33 in the short length direction. The results of a simulation by the inventors on this matter are shown in FIG. 10. The horizontal axis in the graph of FIG. 10 is the position of the center 33 in the short length direction. The left side in FIG. 10 corresponds to the left bias in FIG. 5, that is, bias to the same side as the current collecting part 20, and the right side corresponds to the left bias in FIG. 5, that is, bias to the opposite side to the current collecting part 20. The vertical axis in FIG. 10 is the magnitudes of the moments MA and MB. In the simulation, the magnitudes of the forces G and F are constant.

[0030] Looking at Figure 10, there is a difference in the linearity between the graph of moment MA and the graph of moment MB. First, look at the graph of moment MA. The graph of moment MA is a linear curve that slopes gently upward to the right. In other words, if the force G is constant, the more the center 33 is biased to the left, the smaller the moment MA, and the more the center 33 is biased to the right, the larger the moment MA. However, even though the moment MA is larger when it is biased to the right, the difference is only slight.

[0031] In contrast, the graph of moment MB has an overall inclination direction opposite to that of moment MA. Not only that, but in the region to the left of the center of the graph of moment MB, the inclination itself becomes steeper the further to the left it is. For this reason, if center 33 is biased to the same side as current collecting part 20, moment MB will be very large when horizontal force F is applied, and there is a possibility that joint 31 and the like will be damaged.

[0032] For this reason, in this embodiment, the first hole 25 and the first fixing portion 17 are arranged in a position offset in the opposite direction to the center 32 of the base of the current collecting portion 20 in the short length direction, as described above. This prevents significant damage to the joint 31 even if a horizontal force F is applied to the second piece 15. The position in the left-right direction of the center 33 of the first hole 25 in FIG. 5 corresponds to the position where the graph of moment MA and the graph of moment MB intersect in FIG. 10. This position is considered to have the smallest total effect when both the horizontal force F and the vertical force G are taken into consideration.

[0033] The same can be said about the position of the center 34 of the second hole portion 26. Like the position of the center 33, the position of the center 34 is preferably arranged at a position biased in the opposite direction to the current collecting portion 20. However, the influence of the position of the center 33 of the first hole portion 25 described above is greater than the influence of the position of the center 34 of the second hole portion 26. This is because, as described in the explanation of the longitudinal direction in FIG. 5, when viewed in the longitudinal direction, the distance from the center 33 to the current collecting portion 20 is shorter than the distance from the center 34 to the current collecting portion 20.

[0034] Although it has been stated above that "the center 32 of the base of the current collecting part 20" is the center of gravity of the area occupied by the current collecting part 20 in Fig. 5, that is, the geometric center of gravity of the base of the current collecting part 20, it is possible to use the center 32 as the center of the maximum range in the left-right direction and the maximum range in the up-down direction of the area occupied by the current collecting part 20.

[0035] In addition to the above, another situation in which stress is applied to the battery terminals 8 is when attaching the busbars 11. The busbars 11 are conductive members that connect the batteries 1 together in a battery stack 35 as shown in Fig. 11. In Fig. 11, the busbars 11 connect one battery terminal 8 of adjacent batteries 1 to the other battery terminal 9. Although only two batteries 1 are shown in Fig. 11, in an actual battery stack 35, many more batteries 1 are connected in series via the busbars 11.

[0036] For this reason, a process is included in which the busbar 11 is joined to the battery terminal 8. The part of the battery terminal 8 that is joined to the busbar 11 is the first plate-shaped portion 16 of the first piece 14. More specifically, it is the first surface 21 that is disposed facing outward at the location of the external terminal 6 of the battery 1. Laser welding or other welding is used to join the busbar 11 to the first surface 21. The arrow L shown in FIG. 11 indicates the laser light that is irradiated for laser welding.

[0037] As shown in Fig. 12, when the busbar 11 is joined, parts of the busbar 11 and the first plate-shaped portion 16 melt locally, forming a molten portion 36. At the time when the molten portion 36 is formed, the temperature of the busbar 11 and the first plate-shaped portion 16 is also significantly higher than normal, and they are thermally expanded. When the temperatures of the busbar 11 and the first plate-shaped portion 16 return to normal, their sizes also return to the sizes before the thermal expansion. At this time, the molten portion 36 resolidifies, so that the molten portion 36 and its surroundings tend to strongly shrink. The molten portion 36 becomes a weld mark.

[0038] Due to this strong shrinkage of the molten portion 36 and its surroundings, the first plate-shaped portion 16 and the bus bar 11 after joining are subjected to a tension T. This tension T becomes a stress factor in the battery terminal 8. However, in this embodiment, the first piece 14 and the second piece 15 are connected by two fixing portions 17, 18. As a result, there are two columnar portions (first columnar portion 27, second columnar portion 29), and the rigidity of the battery terminal 8 as a whole is high. Therefore, even when the tension T due to shrinkage during resolidification is applied, the joint portion 31 does not deteriorate much.

[0039] Furthermore, the battery stack 35 may be used as an on-board battery for a vehicle. In that case, vibrations caused when the vehicle is running may continuously act as stress on the battery terminal 8 in the battery 1. However, even in that case, the battery terminal 8 has high stress resistance with the configuration of this embodiment. The reason for this is that, as described above, the first fixing portion 17 and the second fixing portion 18 are provided in the battery terminal 8 in an offset manner in the opposite direction to the current collecting portion 20. Also, the fixing portions (17, 18) are provided in two places on one battery terminal 8.

[0040] As described above in detail, according to this embodiment, for the two-piece battery terminal 8 of the battery 1, the first piece 14 and the second piece 15 are fixed at two fixing parts (first fixing part 17 and second fixing part 18), and the positions of these in the short length direction are offset in the opposite direction to the current collecting part 20. This provides a battery terminal 8 that is resistant to stress that may be received after the first piece 14 and the second piece 15 are fixed, and a battery 1 that uses this battery terminal 8.

[0041] The present embodiment and examples are merely illustrative and do not limit the disclosed technology in any way. Therefore, the disclosed technology can naturally be improved and modified in various ways without departing from the gist of the technology. For example, the sizes of the first fixing portion 17 and the second fixing portion 18 may be different. FIG. 13 is an example of this, and is taken from the same line of sight as FIG. 5. In the example of FIG. 13, the second umbrella portion 30 of the second fixing portion 18 is larger than the first umbrella portion 28 of the first fixing portion 17. The size relationship may be reversed. In addition, the size of the first umbrella portion 28 is not limited to a difference between the size of the first umbrella portion 28 and the size of the second umbrella portion 30, and the diameter of the first columnar portion 27 and the diameter of the second columnar portion 29 may be different. In this case, the diameter of the first hole portion 25 and the diameter of the second hole portion 26 are also different.

[0042] Furthermore, the amount of deviation from the center C in the short length direction does not have to be the same for first fixed portion 17 and second fixed portion 18. Furthermore, it is sufficient that only first fixed portion 17 is biased in the opposite direction to current collecting portion 20, and second fixed portion 18 may be disposed at center C or may be biased in the same direction as current collecting portion 20. However, it is more advantageous if second fixed portion 18 is also biased in the opposite direction to current collecting portion 20.

[0043] In addition, the battery terminal to which the technology disclosed herein is applied is not limited to the negative electrode terminal, but may be the positive electrode terminal. The technology disclosed herein may be applied to both the negative electrode terminal and the positive electrode terminal. The material types of the first piece 14 and the second piece 15 are not limited to the above-mentioned aluminum and copper, but may be other types of metals or alloys. The battery type of the battery 1 is not limited. [Explanation of symbols]

[0044] 1 Battery 9 Battery terminal 2 Exterior body 11 Bus bar 3 Power generating element 14 First piece 5 Lid 15 Second piece 8 Battery terminal 16 First plate portion 17 First fixing part 26 Second hole part 18 Second fixed part 27 First columnar part 19 Second plate portion 28 First umbrella portion 20 Current collecting portion 29 Second columnar portion 21: First surface of first plate-shaped portion; 30: Second umbrella portion 22 second surface of first plate-shaped portion 31 joint portion 23: first surface of second plate-shaped portion; 32: center of root of current collecting portion 24: second surface of second plate-shaped portion; 33: center of first hole portion 25 First hole 34 Center of second hole

Claims

1. A battery terminal that connects a power generating element disposed inside an exterior body of a battery to an external conductive member disposed outside the exterior body, The connector has a two-piece structure having a first piece and a second piece made of different conductive materials, and the first piece is a first plate-shaped portion having a first surface and a second surface, the first surface being disposed so as to face outward in the battery and connected to the external conductive member; a first fixing portion and a second fixing portion that are provided on the second surface of the first plate-shaped portion and fix the second piece; The second piece is a second plate-shaped portion having a first surface and a second surface, a shape having a long dimension and a short dimension in a plan view, the first surface being disposed toward the second surface of the first plate-shaped portion, and a first hole portion and a second hole portion being formed therein; a current collecting portion that is connected to the power generating element and is provided at a position offset from the center of the second surface of the second plate-shaped portion in both the long dimension direction and the short dimension direction, and the first fixing portion is A first columnar portion located within the first hole; a first umbrella portion extending to a larger diameter than the first columnar portion on the second surface of the second plate-shaped portion, The second fixing portion is A second columnar portion located in the second hole; a second umbrella portion that expands to a larger diameter than the second columnar portion on the second surface of the second plate-shaped portion, At least a portion of the first umbrella portion and at least a portion of the second umbrella portion are joined to the second surface of the second plate-shaped portion, a center of the first hole portion is located between a center of a base of the current collecting portion and a center of the second hole portion with respect to a longitudinal direction of the second plate-shaped portion, With respect to the center of the second plate-shaped portion in the short length direction, The center of the root of the current collecting portion is offset, A battery terminal in which the center of the first hole portion is biased in a direction opposite to the bias of the center of the base of the current collecting portion, and the amount of bias of the center of the first hole portion is within a range in which the moment of a vertical force pulling the second piece downward due to the weight of the power generating element after the power generating element is attached to the current collecting portion and before it is inserted into the outer casing does not cause damage to the joint between the first umbrella portion and the second surface.

2. The battery terminal according to claim 1 , A battery internal terminal, wherein the center of the second hole portion is offset in a direction opposite to the offset of the center of the base of the current collecting portion with respect to the center in the short length direction of the second plate-shaped portion.

3. A battery having an exterior body, a power generating element housed inside the exterior body, and a terminal connected to the power generating element, The battery, wherein the terminal is a battery terminal according to claim 1 or 2.

4. 4. The battery of claim 3, A battery having a bus bar connected to the terminal that connects to other batteries.

Images