JP5369900B2 - Batteries, vehicles, and equipment using batteries - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery or the like which sufficiently secures connection strength and connection reliability of a caulking part of an element connection member and a fixing part of an externally arranged terminal member in an electrode terminal member. <P>SOLUTION: A lithium secondary battery 100 has a form where a fixing hole 133eh of the fixing part 133e of the externally arranged terminal member 133 includes an outside end part 133eh2 enlarged to an external of the battery. The caulking part 131g of the element connection member 131 is welded to the fixing part 133e. The welded part 132 is formed only on a caulking outer circumference part 131gd of the caulking part 131g positioned on a radially outer side than the outside end part 133eh2, and a fixing part outer circumference part 133ed of the fixing part 133e positioned on a radially outer side than the outside end part 133eh2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a battery including a power generation element, a battery case that accommodates the power generation element, and an electrode terminal member that is connected to the power generation element in the battery case and extends to the outside of the battery case. Moreover, it is related with a vehicle provided with this battery, and a battery using apparatus provided with this battery.

  Conventionally, a power generation element, a battery case that accommodates the power generation element, and an electrode terminal member that is connected to the power generation element in the battery case and extends to the outside of the battery case and used for connection to an external connection terminal A battery is known. For example, Patent Document 1 discloses such a battery. FIG. 13 shows a longitudinal sectional view of the vicinity of the fixing portion 933e of the electrode terminal member 930 in the battery 900, and FIG. 14 shows an exploded perspective view corresponding to FIG.

The battery 900 includes a battery case 910 that houses a power generation element (not shown), an electrode terminal member 930 that is connected to the power generation element in the battery case 910 and extends outside the battery case 910, and the electrode terminal member Two types of insulating members (an external insulating member 950 and a seal rubber 960) are provided between the battery case 930 and the battery case 910 to insulate them.
Among these, the battery case 910 includes a box-shaped case main body member (not shown) that houses the power generation element, and a case lid member 913 that closes the opening of the case main body member. A terminal insertion hole 913 h is formed in the case lid member 913, and the electrode terminal member 930 is inserted therethrough.

The electrode terminal member 930 is composed of three members: an element connecting member 931, an externally arranged terminal member 933, and a fastening member not shown.
Among these, the element connection member 931 includes an element connection main body portion 931e, an insertion portion 931f, and a caulking portion 931g. The element connection main body 931e is located inside the battery case 910 and is connected to the power generation element. The insertion portion 931f is connected to the upper end (the upper end in FIGS. 13 and 14) of the element connection main body portion 931e, and fixes a terminal insertion hole 913h of the case lid member 913 and an external connection terminal member 933 to be described later. The fixing hole 933eh of the portion 933e is inserted. The caulking portion 931g is connected to the upper end of the insertion portion 931f, is exposed to the outside of the battery, is caulked and enlarged in diameter to form an umbrella shape, and is in contact with the fixing portion 933e of the external connection terminal 933 from above.

  The externally arranged terminal member 933 is located on the case lid member 913, and includes a fixing portion 933e, an intermediate portion 933f, and an external connection portion (not shown), and has a Z shape. The fixing portion 933e has a tapered fixing hole 933eh that penetrates itself and expands toward the outside of the battery (upward), and is connected to the element connection portion 931 (caulking portion 931g) as described above. . The fixing portion 933e has a plate shape extending along and parallel to the case lid member 913, and is fixed to the case lid member 913 via an external insulating member 950 described later. The intermediate portion 933f is connected to the fixing portion 933e and has a plate shape extending upward (upward in FIGS. 13 and 14).

JP 2008-192552 A

  In the battery 900 described above, the caulking portion 931g of the element connecting member 931 and the fixing portion 933e of the externally arranged terminal member 933 are connected by caulking the caulking portion 931g of the element connecting member 931 as described above. . For this reason, it is difficult to ensure sufficient connection strength, and contact resistance may increase due to loosening of caulking due to long-term use. Therefore, the inventor fixes the caulking portion 931g of the element connecting member 931 and the fixing portion 933e of the externally arranged terminal member 933, and further welds the caulking portion 931g and the fixing portion 933e. Thought.

  However, when the caulking portion 931g and the fixing portion 933e are welded, a blow hole may occur in the welded portion. When blowholes are generated, the welding area is reduced and connection reliability is lowered. As a result of intensive studies by the inventor, the cause of blowholes is that when welding is applied to the tapered portion of the fixing hole 933eh of the fixing portion 933e, the caulking portion 931g and the taper portion are in close contact by caulking. In addition, it was thought that there was no escape route for gas generated during welding, leading to the generation of blowholes.

  The present invention has been made in view of such a situation, and in the battery in which the electrode terminal member is configured to crimp and fix the crimping portion of the element connection member and the fixing portion of the externally arranged terminal member, It is an object of the present invention to provide a battery that can sufficiently secure the connection strength and connection reliability between a crimped portion and a fixed portion. Moreover, it aims at providing the vehicle provided with this battery, and the battery use apparatus provided with this battery.

  The solution includes a power generation element, a battery case having an opening and housing the power generation element, a battery case having a case lid member closing the opening of the case main body member, and the battery case. An electrode terminal member connected to the power generation element and extending onto the case lid member through a terminal insertion hole formed in the case lid member, wherein the electrode terminal member is the battery case Connected to the power generation element inside the element, and connected to the element connection member inserted into the terminal insertion hole of the case lid member, and to the element connection member, on the case lid member of the outside of the battery case An external connection terminal member, and the element connection member is located inside the battery case and connected to the power generation element, and the element connection body An insertion portion that is inserted into the terminal insertion hole of the case lid member, is connected to the insertion portion, is exposed to the outside of the battery, is crimped and expanded in diameter to form an umbrella shape, and the external placement terminal member The externally arranged terminal member extending along the case lid member, and being fixed to the case lid member, the fixing member penetrating through the element. The insertion portion of the connection member is inserted, and includes a fixing portion with which the caulking portion of the element connection member is engaged. At least the outer end portion of the fixing portion faces the outside of the battery. The caulking portion and the fixing portion are, among the caulking portions, a caulking outer peripheral portion positioned radially outward from the outer end portion of the fixing hole, and the Of the fixed part, it is more radial than the outer end of the fixed hole. Only in the fixed outer peripheral portion that is located outside a cell formed by welded together.

In the battery of the present invention, the caulking portion of the element connecting member is caulked and fixed to the fixing portion of the externally arranged terminal member, and these are further welded. For this reason, it is possible to sufficiently secure the connection strength between the caulking portion and the fixing portion, and it is possible to prevent the contact resistance from increasing even when used for a long period of time.
Moreover, in the present invention, the welding between the caulking portion and the fixing portion is the fixing portion among the caulking portion, the caulking outer peripheral portion located radially outside the outer end portion of the fixing hole, and the fixing portion. This is performed only at the outer peripheral portion of the fixed portion located radially outside the outer end portion of the hole. When the caulking portion is deformed and fixed to the fixing portion by caulking, the caulking portion closely contacts the outer end portion of the fixing hole without any gap. On the other hand, since the spring back is generated even if the crimping outer peripheral portion of the crimping portion is deformed so as to be pressed against the fixing portion outer peripheral portion of the fixing portion, a slight gap is generated between them. For this reason, if welding between the caulking portion and the fixing portion is performed at the caulking outer peripheral portion and the fixing portion outer peripheral portion, the gas generated during welding easily moves to the outside in the radial direction through the gap and is easily released to the outside. It is possible to effectively suppress the occurrence of blow holes and sometimes poor welding. Therefore, since it is possible to reliably weld the caulking portion and the fixing portion, it is possible to particularly improve the connection reliability between them.

In addition, as the “power generation element”, for example, a winding type power generation element obtained by winding a positive electrode, a negative electrode, and a separator each having a long shape, and a plurality of positive electrodes, negative electrodes, and separators each having a predetermined shape are stacked. And a laminated power generation element.
Examples of the “battery case” include a rectangular battery case and a cylindrical battery case.
As the form of the “fixed hole”, for example, the whole hole including the outer end portion may have a tapered shape that expands toward the outside of the battery, or the tapered shape in which only the outer end portion expands toward the outside of the battery. An eggplant may be used.

  Furthermore, in the battery described above, it is preferable that the outer end portion of the fixing hole is a battery in which an angle with the central axis of the fixing hole is 20 degrees to 45 degrees.

  If the angle (hereinafter also referred to as the inclination angle) formed with the central axis of the outer end portion of the fixing hole is made too small, specifically, if the inclination angle is made smaller than 20 degrees, the connection strength by caulking becomes small, The caulking portion of the element connecting member is easily detached from the fixing portion of the externally arranged terminal member. On the other hand, if the inclination angle of the outer end portion of the fixing hole is too large, specifically, if the inclination angle is larger than 45 degrees, the opening diameter of the fixing hole becomes large. The area that can be welded to the outer peripheral portion of the fixed portion of the portion is reduced. For this reason, it becomes easy to receive restrictions when welding a caulking part to a fixed part.

  On the other hand, in the battery of the present invention, since the angle (inclination angle) formed with the central axis of the outer end portion of the fixing hole is 20 degrees or more, the connection strength by caulking can be sufficiently secured. On the other hand, since the inclination angle of the outer end portion of the fixing hole is 45 degrees or less, the opening diameter can be kept to an appropriate size, and the caulking outer peripheral portion of the caulking portion and the fixing portion outer peripheral portion of the fixing portion It is possible to secure a sufficient area for welding. For this reason, when welding a crimping part to a fixing | fixed part, the crimping outer peripheral part of a crimping part and the fixing | fixed part outer peripheral part of a fixing part can be welded reliably. Therefore, the connection reliability between the crimping portion of the element connection member and the fixing portion of the externally arranged terminal member can be further improved by setting the inclination angle of the outer end portion of the fixing hole to 20 degrees to 45 degrees. It is more preferable that the inclination angle of the outer end portion of the fixing hole is 30 degrees to 45 degrees.

  Further, in the battery described above, the caulking outer peripheral portion of the caulking portion may be a battery having a radial dimension of 0.5 mm or more.

When the radial dimension (hereinafter also referred to as radial dimension) of the crimping outer peripheral portion of the crimping portion is smaller than 0.5 mm, the crimping portion of the element connection member is welded to the fixed portion of the externally arranged terminal member. In this case, the weldable area between the caulking outer peripheral portion of the caulking portion and the fixing portion outer peripheral portion of the fixing portion is reduced. For this reason, it becomes easy to receive restrictions when welding a caulking part to a fixed part.
On the other hand, in the battery of the present invention, since the radial dimension of the crimping outer peripheral portion is 0.5 mm or more, a sufficient weldable area between the crimping outer peripheral portion of the crimping portion and the fixing portion outer peripheral portion of the fixing portion is sufficient. Can be secured. For this reason, when welding a crimping part to a fixing | fixed part, the crimping outer peripheral part of a crimping part and the fixing | fixed part outer peripheral part of a fixing part can be welded reliably. Therefore, it is possible to further improve the connection reliability between the caulking portion of the element connecting member and the fixing portion of the externally arranged terminal member. It is more preferable that the radial dimension of the caulking outer peripheral portion is 1.0 mm or more.

  Furthermore, in the battery according to any one of the above, the outer end portion of the fixing hole is a first outer end portion and a second outer end portion arranged in a circumferential direction of the fixing hole, and the first end portion is the first outer end portion. A first outer end portion and a second outer end portion, wherein an angle formed between the outer end portion and the central axis of the fixing hole is larger than an angle formed between the second outer end portion and the central axis of the fixing hole; It is preferable to have a battery.

  In the battery of the present invention, the outer end portion of the fixing hole is configured such that the first outer end portion and the second outer end portion, which are different in angle (inclination angle) with the central axis, are arranged in the circumferential direction. As described above, since the outer end portion of the fixing hole has a directivity in the circumferential direction, the caulking portion of the element connecting member and the fixing portion of the externally arranged terminal member can be effectively prevented from rotating relatively.

  In the battery described above, the caulking portion and the fixing portion may be batteries that are welded to each other only on the radially outer side of the second outer end portion of the fixing hole.

  As described above, since the angle (inclination angle) formed with the central axis of the second outer end portion is smaller than the inclination angle of the first outer end portion, the outer diameter of the second outer end portion is also small. For this reason, since the area that can be welded between the caulking outer peripheral portion of the caulking portion and the fixing portion outer peripheral portion of the fixing portion can be sufficiently secured on the outer side in the radial direction of the second outer end, During welding, the caulking outer peripheral portion of the caulking portion and the fixed portion outer peripheral portion of the fixing portion can be reliably welded. Therefore, it is possible to effectively prevent the caulking portion of the element connecting member and the fixing portion of the externally arranged terminal member from rotating relatively, and to further improve the connection reliability between the caulking portion and the fixing portion. Can do.

  Another solution is a vehicle on which the battery according to any one of the above is mounted and electric energy generated by the battery is used for all or part of a power source.

Compared with the conventional battery 900, the above-mentioned battery is welded after the crimping portion of the element connecting member is crimped and fixed to the fixing portion of the externally arranged terminal member. The contact resistance can be prevented from increasing even when used for a long period of time. In addition, since welding failure can be suppressed during welding of the crimped portion and the fixed portion, the connection reliability between them can be particularly improved. Therefore, the reliability of a vehicle equipped with this battery can be improved.
Examples of the “vehicle” include an electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electrically assisted bicycle, and an electric scooter.

  Another solution is a battery-using device in which the battery according to any one of the above is mounted and the battery is used as at least one energy source.

Compared with the conventional battery 900, the above-mentioned battery is welded after the crimping portion of the element connecting member is crimped and fixed to the fixing portion of the externally arranged terminal member. The contact resistance can be prevented from increasing even when used for a long period of time. In addition, since welding failure can be suppressed during welding of the crimped portion and the fixed portion, the connection reliability between them can be particularly improved. Accordingly, it is possible to improve the reliability of a battery-using device equipped with this battery.
Examples of the “battery-equipped device” include various home appliances driven by a battery such as a personal computer, a mobile phone, a battery-driven electric tool, and an uninterruptible power supply, office equipment, and industrial equipment.

1 is a longitudinal sectional view of a lithium secondary battery according to Embodiment 1. FIG. 4 is an exploded perspective view showing an electrode terminal member, a case lid member, and each insulating member in the lithium secondary battery according to Embodiment 1. FIG. 4 is a side view of an externally arranged terminal member for the lithium secondary battery according to Embodiment 1. FIG. FIG. 3 is a longitudinal sectional view showing the vicinity of a fixing part and a caulking part of an electrode terminal member in the lithium secondary battery according to Embodiment 1. FIG. 3 is a longitudinal sectional view showing, in an enlarged manner, a vicinity of a welded portion between a fixing portion of an electrode terminal member and a caulking portion in the lithium secondary battery according to Embodiment 1. FIG. 6 is a plan view of a lithium secondary battery according to Embodiment 2 as viewed from above an externally arranged terminal member. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6 of the externally arranged terminal member for the lithium secondary battery according to the second embodiment. FIG. 7 is a cross-sectional view of the externally arranged terminal member taken along the line BB in FIG. 6 regarding the lithium secondary battery according to the second embodiment. FIG. 6 is a plan view of a lithium secondary battery according to Embodiment 3 as viewed from above an externally arranged terminal member. FIG. 5 is a side view of the lithium secondary battery according to Embodiment 3 as viewed from the external connection portion side of the externally arranged terminal member. It is explanatory drawing which shows the vehicle which concerns on Embodiment 4. FIG. It is explanatory drawing which shows the hammer drill which concerns on Embodiment 5. FIG. It is a longitudinal cross-sectional view which expands and shows the fixing | fixed part vicinity of the electrode terminal member of the battery which concerns on a prior art. It is a disassembled perspective view which shows the electrode terminal member of a battery which concerns on a prior art, a case cover member, and each insulation member.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the longitudinal cross-sectional view of the lithium secondary battery (battery) 100 of this Embodiment 1 is shown. 2 to 5 show details of the positive electrode terminal member 130, the negative electrode terminal member 140, and the like constituting the lithium secondary battery 100. 1 to 5 will be described as the upper side of the lithium secondary battery 100 and the lower side as the lower side of the lithium secondary battery 100.

  The lithium secondary battery 100 is a prismatic battery that is mounted on a vehicle such as a hybrid car or an electric vehicle, or a battery-powered device such as a hammer drill. The lithium secondary battery 100 includes a rectangular battery case 110, an electrode body (power generation element) 120 housed in the battery case 100, and an insulating film enclosed in the battery case 110 while surrounding the electrode body 120. Body 125, two electrode terminal members 130, 140 supported by battery case 110, and three types of insulating members 150, 160, 170 that insulate between battery case 110 and electrode terminal members 130, 140. Yes. In addition, an electrolytic solution is injected into the battery case 110.

Among these, the battery case 110 is made of metal (specifically, pure aluminum) and is formed in a rectangular parallelepiped shape. The battery case 110 has a box shape in which only the upper side is opened. The battery case 110 has a rectangular shape that is welded in a form that closes an opening 111h of the case body member 111 and a case body member 111 that houses an electrode body 120 described later. And a case lid member 113.
The case body member 111 includes a rectangular plate-like case bottom wall portion 111b facing the case lid member 113, and four rectangular plate-like case side wall portions 111c connecting the case lid member 113 and the case bottom wall portion 111b, 111c,...

  The case lid member 113 has a rectangular plate shape having a front surface 113a and a back surface 113b, and penetrates the case lid member 113 at predetermined positions near both ends in the longitudinal direction (left and right directions in FIGS. 1 and 2). Circular terminal insertion holes 113h and 113h are formed, respectively. A positive electrode terminal member 130 (described later) is inserted into one terminal insertion hole 113h (left side in FIGS. 1 and 2), and the other terminal insertion hole 113h (right side in FIGS. 1 and 2) is described later. The negative electrode terminal member 140 to be inserted is inserted.

  A safety valve portion 113j is provided at the center of the case lid member 113 in the longitudinal direction. The safety valve portion 113j is formed integrally with the case lid member 113 and forms a part of the case lid member 113. The safety valve portion 113j is formed in a thin film shape (thickness 110 ± 30 μm) thinner than other portions of the case lid member 113, and has a V-shaped groove on the upper side thereof, and is particularly thin with a thickness of 45 ± 30 μm. The breaking portion 113jv is formed in a predetermined shape. As a result, the safety valve portion 113j operates when the internal pressure inside the battery case 110 reaches a predetermined pressure. That is, when the internal pressure reaches a predetermined pressure, the breaking portion 113jv breaks and releases the gas inside the battery to the outside of the battery.

A thin resin film 115 made of PPS resin is deposited on the safety valve portion 113j. Since the safety valve portion 113j is formed thin and the break portion 113jv is formed particularly thin, there is a risk of damage such as a hole formed by oxidation. However, since the safety valve portion 113j is protected from the outside by forming the resin film 115 on the safety valve portion 113j, it is possible to effectively prevent the safety valve portion 113j from being damaged.
In addition, a liquid injection port portion 113 m for injecting the electrolyte into the battery case 110 is provided at a predetermined position on the negative electrode terminal member 140 side from the longitudinal center of the case lid member 113.

  As shown in FIG. 1, in the battery case 110, a wound electrode body 120 having an elliptical cross section orthogonal to its own axial direction (left and right direction in FIG. 1) is laid down. In other words, the electrode body 120 is accommodated in a state in which the axial direction of the electrode body 120 is orthogonal to the two case side wall portions 111 c and 111 c of the case body member 111. The element connection member 131 of the positive electrode terminal member 130 and the element connection member 131 of the negative electrode terminal member 140 are connected to both ends of the electrode body 120 in the axial direction.

This electrode body 120 is obtained by rolling a positive electrode sheet and a negative electrode sheet with a separator interposed between them and compressing them into a flat shape. The positive electrode sheet has a positive electrode current collector made of a long aluminum foil. A positive electrode active material layer containing a positive electrode active material is formed on both surfaces of the positive electrode current collector. The negative electrode sheet has a negative electrode current collector made of a long copper foil. A negative electrode active material layer containing a negative electrode active material is formed on both surfaces of the negative electrode current collector. The separator is made of a porous polypropylene resin sheet.
The electrode body 120 is entirely surrounded by an insulating film enclosure 125 formed by bending an insulating film into a box shape having an opening only on the upper side and welding a predetermined portion, except for its upper side.

Next, the positive electrode other electrode terminal member 130 and the negative electrode terminal member 140 will be described (see FIGS. 1 to 5). Since the positive electrode terminal member 130 and the negative electrode terminal member 140 have basically the same configuration, the same reference numerals are given to the respective members constituting the positive electrode terminal member 130 and the negative electrode terminal member 140. To explain.
The positive electrode terminal member 130 is electrically and mechanically connected to the positive electrode sheet of the electrode body 120 inside the battery case 110, while the battery is passed through the terminal insertion hole 113 h formed in the battery case 110 (case lid member 113). It extends outside the case 110 (on the case lid member 113). Further, the negative electrode terminal member 140 is electrically and mechanically connected to the negative electrode sheet of the electrode body 120 inside the battery case 110, while passing through a terminal insertion hole 113 h formed in the battery case 110 (case lid member 113). The battery case 110 extends outside (on the case lid member 113).

  These electrode terminal members 130 and 140 are connected to the element connecting member 131 extending from the inside of the battery case 110 through the terminal insertion hole 113h onto the case lid member 113, and to the element connecting member 131, respectively. The external arrangement terminal member 133 located on the 113 and the fastening member 135 connected to the external arrangement terminal member 133 and arranged on the case lid member 113. The element connecting member 131, the externally arranged terminal member 133, and the fastening member 135 are all made of metal. The element connection member 131 of the positive electrode terminal member 130 is made of pure aluminum in consideration of welding with the positive electrode sheet (aluminum foil) of the electrode body 120, and the element connection member 131 of the negative electrode terminal member 140. Is formed of pure copper in consideration of welding of the electrode body 120 to the negative electrode sheet (copper foil).

Among these, the element connection member 131 includes an element connection main body 131e, an insertion portion 131f, and a caulking portion 131g.
The element connection main body 131e has a predetermined shape obtained by bending a metal plate material, is located inside the battery case 110, and is welded to the electrode body 120. Thereby, the element connection member 131 and the electrode body 120 are electrically and mechanically connected.
The insertion portion 131f has a cylindrical shape, and is continuous with the upper end 131es of the element connection main body portion 131e at its lower end, and is continuous with the crimping portion 131g at its upper end. The insertion portion 131f is inserted into a terminal insertion hole 113h of the case lid member 113 and a fixing hole 133eh of a fixing portion 133e of the externally arranged terminal member 133 described later.

  The caulking portion 131g is exposed to the outside of the battery, is caulked and enlarged in diameter to form an umbrella shape, and engages with a fixing portion 133e of the externally arranged terminal member 133 described later from above. The caulking portion 131g includes an annular caulking outer peripheral portion 131gd that is located radially outside the outer end portion 133eh2 of the fixing hole 133eh, which will be described later, and a caulking central portion 131gc that is located radially inward of the caulking portion 131g. (See FIGS. 4 and 5). Of these, the caulking outer peripheral portion 131gd has a radial dimension (radial dimension) LA of 0.5 mm or more (in the first embodiment, the radial dimension LA = 1.0 mm).

  The caulking portion 131g is welded to the fixing portion 133e of the externally arranged terminal member 133. Specifically, only the caulking outer peripheral portion 131gd of the caulking portion 131g is welded to the fixing portion 133e of the externally arranged terminal member 133. That is, in the crimped portion 131g, the portion where the welded portion 132 is formed is only the crimped outer peripheral portion 131gd. A plurality (four) of the welded portions 132 are formed at equal intervals in the circumferential direction on the caulking outer peripheral portion 131gd and a fixing portion outer peripheral portion 133ed of the fixing portion 133e described later.

The externally arranged terminal member 133 is located on the case lid member 113 in the outside of the battery case 110, and includes a fixed portion 133e, an intermediate portion 133f, and an external connection portion 133g, and has a Z shape (step shape).
Among these, the fixing portion 133e has a plate shape having a fixing portion surface 133ea facing the side opposite to the case lid member 113 (upper side) and a fixing portion rear surface 113eb facing the case lid member 113 side (lower side). The fixing portion 133e extends along and parallel to the case lid member 113, and is fixed to the case lid member 113 via an external insulating member 150 described later. Specifically, the fixing portion 133e is disposed in the fixing portion recess 150fm of the external insulating member 150. Further, the fixed portion surface 133ea is exposed to the outside of the battery without being covered by the external insulating member 150.

  The fixing portion 133e is formed with a fixing hole 133eh that passes through the fixing portion 133e, and the insertion portion 133f of the element connection member 131 is inserted as described above. The fixing hole 133eh is located on the case lid member 113 side (lower side), and is located on the opposite side (upper side) of the circular hole portion 133eh1 having a constant opening diameter and the case lid member 113 side. The outer end portion 133eh2 is a tapered hole that linearly expands outward (upward) from the battery. Of these, the outer end 133eh2 has an angle (inclination angle) θ1 formed with the central axis AX of the fixing hole 133eh of 20 to 45 degrees (in this embodiment, the inclination angle θ1 = 30 degrees) (FIG. 4). reference).

  Further, as described above, the caulking portion 131g of the element connecting member 131 is connected to the fixing portion 133e. Specifically, the crimping central portion 131gc of the crimping portion 131g contacts the outer end portion 133eh2 of the fixing hole 133eh without a gap, and the crimping outer peripheral portion 131gd of the crimping portion 131g is included in the fixing portion 133e. The fixing hole 133eh is positioned on the fixing portion outer peripheral portion 133ed that is positioned radially outward from the outer end portion 133eh2. As described above, the caulking portion 131g and the fixing portion 133e are welded to each other, and the welding portion 132 includes the caulking outer peripheral portion 131gd of the caulking portion 131g and the fixing portion outer periphery of the fixing portion 133e. It is formed only on the portion 133ed.

  The intermediate part 133f has a plate shape having an intermediate part surface 133fa continuous with the fixed part surface 133ea of the fixed part 133e and an intermediate part back surface 133fb continuous with the fixed part back surface 133eb. The intermediate portion 133f is connected to the fixing portion 133e, and extends in a direction away from the case lid member 113 in the direction away from the case lid member 113, in the first embodiment, in the direction perpendicular to the case lid member 113 (upper side). Yes. The intermediate portion surface 133fa is exposed to the outside of the battery without being covered by the external insulating member 150.

  The external connection portion 133g has a plate shape having a connection portion surface 133ga facing the opposite side (upper side) to the case lid member 113 side and a connection portion rear surface 133gb facing the case lid member 113 side (lower side). The external connection portion 133g is connected to the intermediate portion 133f, extends along the case lid member 113, and is formed with a circular screw insertion hole 133gh that passes through the external connection portion 133g. Of the external connection portion 133g, the entire connection portion surface 133ga is exposed to the outside of the battery without being covered by the external insulating member 150 described later. The connection portion surface 133ga is used for electrical connection with an external connection terminal such as a bus bar.

  Further, as shown in FIG. 3, the external connection portion 133g is inclined toward the case lid member 113 by an angle θ2 = 10 degrees with respect to the case lid member 113. This angle θ2 is preferably 1 to 30 degrees. By providing the external connection portion 133g with the angle θ2 in this manner, an external connection terminal such as a bus bar is brought into contact with the connection portion surface 133ga, and a nut or the like is fastened to the male screw portion 135e of the fastening member 135 described later. In such a case, it is possible to prevent loosening of the nut or the like. As a result, an increase in contact resistance between the external connection portion 133g and the external connection terminal can be suppressed, and problems such as abnormal heat generation of the lithium secondary battery 100 can be surely prevented. And safety can be improved.

Next, the fastening member 135 will be described (see FIGS. 1 and 2). The fastening member 135 includes a male screw portion 135e having a male screw formed on the outer periphery thereof, and a base portion 135f having a larger diameter than that.
Among these, the male screw portion 135e is inserted into the screw insertion hole 133gh of the external connection portion 113g in a form extending in a direction (vertical direction) orthogonal to the case lid member 113, and the male screw is formed on the outer periphery as described above. ing. In FIG. 1 and FIG. 2, the description of the male screw is omitted.

  The base portion 135f is a disc-shaped disc portion 135f1 and is located on the case lid member 113 side of the disc portion 153f1, and is slightly smaller in diameter than the disc portion 135f1 and has an outer shape of a hexagonal column 135f2. It consists of. The base part 135f is located closer to the case lid member 113 than the external threaded part 135e and the external connection part 133g of the externally arranged terminal member 133. Of the base portion 135f, the base surface 135fa facing the side opposite to the case lid member 113 (upper side) abuts on the connection portion back surface 133gb of the external connection portion 133g, and the fastening member 135 is electrically connected to the external terminal member 133. Connected. In addition, the hexagonal portion 135f2 of the base portion 135f is fitted into a base recess portion 151fn of the external insulating member 150 described later, whereby the fastening member 135 is in a state in which the fastening member 135 cannot rotate about its axis.

  Next, the external insulating members 150 and 150 fixed to the case lid member 113 together with the electrode terminal members 130 and 140 will be described (see FIGS. 1, 2 and 4). The external insulating member 150 is disposed between the electrode terminal members 130 and 140 and the case lid member 113 to prevent the electrode terminal members 130 and 140 and the case lid member 113 from contacting and short-circuiting. . The external insulating member 150 is made of resin (specifically, 100% PPS).

  The external insulating member 150 is disposed outside the battery case 110 (on the case lid member 113) and is disposed in the terminal insertion hole 113h of the case lid member 113. That is, the external insulating member 150 is interposed between the externally arranged terminal member 133 and the surface 113a of the case lid member 113, and between the fastening member 135 and the surface 113a of the case lid member 113. Accordingly, the externally arranged terminal member 133 and the case lid member 113 are insulated from each other, and the fastening member 135 and the case lid member 113 are insulated from each other. The external insulating member 150 is interposed between the insertion portion 131 f of the element connection member 131 and the inner peripheral surface 113 ha of the terminal insertion hole 113 h of the case lid member 113. Thereby, the insertion portion 131f of the element connection member 131 and the case lid member 113 are insulated.

  Specifically, the external insulating member 150 is interposed between the fixed portion back surface 133 eb of the fixed portion 133 e of the externally arranged terminal member 133 and the front surface 113 a of the case lid member 113. That is, the external insulating member 150 is formed with a recess 150fm for a fixing portion that is recessed in the case lid member 113 (lower side) and has a rectangular shape in plan view that opens on the opposite side (upper side) of the case lid member 113. . And the fixing | fixed part 133e of the external arrangement | positioning terminal member 133 is settled in this recessed part 150fm for fixing | fixed parts.

  The external insulating member 150 is interposed between the base portion 135 f of the fastening member 135 and the surface 113 a of the case lid member 113. In other words, the external insulating member 150 is formed with a base recess 150fn that is recessed on the case lid member 113 side (lower side) and opened on the opposite side (upper side) of the case lid member 113 in a plan view. The hexagonal portion 135f2 of the base portion 135f of the fastening member 135 is accommodated in the base recess portion 150fm. As a result, the fastening member 135 is in a state in which it cannot rotate around its axis.

  Next, the seal rubbers 160 and 160 fixed to the case lid member 113 together with the electrode terminal members 130 and 140 will be described. The seal rubber 160 is made of resin, and is sandwiched between the case lid member 113 and the element connection main body 131e of the element connection member 131 in a compressed state in the thickness direction. The seal rubber 160 has an annular plate shape, and an insertion portion 131f of the element connection member 131 is inserted inside the seal rubber 160. The seal rubber 160 provides insulation and sealing between the case lid member 113 and the element connection main body 131e of the element connection member 131.

Next, the internal insulating members 170 and 170 fixed to the case lid member 113 together with the electrode terminal members 130 and 140 will be described. The internal insulating member 170 includes an interposition part 170e, a side wall part 170f, and a side part 170g. The internal insulating member 170 is made of resin, specifically, PPS resin.
The interposition part 170e is disposed on the outer side in the radial direction of the seal rubber 160, and is disposed between the case lid member 113 and the element connection main body part 131e of the element connection member 131. Thereby, it is possible to insulate between the case lid member 113 and the element connection main body 131e of the element connection member 131, and to regulate the thickness of the seal rubber 160 to a predetermined thickness.
The side wall portion 170f is located on the radially outer side of the interposition portion 170e, and extends from the interposition portion 170e to the opposite side (lower side) to the case lid member 113 side.

  The side portion 170g is arranged between the case lid member 113 and the electrode body 120 so as to continue to the sides of the interposition portion 170e and the side wall portion 170f. This reliably prevents the case lid member 113 and the electrode body 120 from contacting each other. Further, since the electrode body 120 can be prevented from moving toward the case lid member 113 due to the presence of the side portion 170g, the electrode body 120 and the safety valve portion 113j provided at the center of the case lid member 113 are provided. However, it is possible to always maintain a state where they are separated by a predetermined distance or more. Thereby, it can prevent that the electrode body 120 block | closes the safety valve part 113j.

  As described above, in the lithium secondary battery 100 according to the first embodiment, the caulking portion 131g of the element connection member 131 is caulked and fixed to the fixing portion 133e of the externally arranged terminal member 133, and these are further welded. doing. For this reason, it is possible to sufficiently secure the connection strength between the caulking portion 131g and the fixing portion 133e, and to prevent the contact resistance from increasing even when used for a long period of time.

  In addition, welding of the crimped portion 131g and the fixed portion 133e is performed only at the crimped outer peripheral portion 131gd of the crimped portion 131g and the fixed portion outer peripheral portion 133ed of the fixed portion 133e. When the caulking portion 131g is deformed and is caulked and fixed to the fixing portion 133e, the caulking portion 131g closely contacts the outer end portion 133eh2 of the fixing hole 133eh without any gap. On the other hand, even if the crimping outer peripheral portion 131gd of the crimping portion 131g is deformed so as to be pressed against the fixing portion outer peripheral portion 133ed of the fixing portion 133e, a springback is generated, so that a slight gap is generated between them. For this reason, if welding of the caulking portion 131g and the fixing portion 133e is performed at the caulking outer peripheral portion 131gd and the fixing portion outer peripheral portion 133ed, the gas generated during welding moves radially outward through the gap and is released to the outside. Since it is easy, it can suppress effectively that a blowhole generate | occur | produces at the time of welding and a welding defect arises. Therefore, since the welding of the caulking portion 131g and the fixing portion 131e can be reliably performed, the connection reliability between them can be particularly improved.

  Furthermore, in the first embodiment, the angle (inclination angle) θ1 formed with the central axis AX of the outer end portion 133eh2 of the fixing hole 133eh is set to 20 degrees or more (specifically, the inclination angle θ1 = 30 degrees). Connection strength by tightening can be sufficiently secured. On the other hand, since the inclination angle θ1 of the outer end portion 133eh2 of the fixing hole 133eh is set to 45 degrees or less, the opening diameter can be set to an appropriate size, and the crimping outer peripheral portion 131gd of the crimping portion 131g and the fixing portion 133e An area that can be welded to the outer peripheral portion 133ed of the fixed portion can be sufficiently secured. For this reason, when welding the crimping part 131g to the fixing | fixed part 133e, the crimping outer peripheral part 131gd of the crimping part 131g and the fixing | fixed part outer peripheral part 133ed of the fixing | fixed part 133e can be welded reliably. Therefore, the connection reliability between the caulking portion 131g and the fixing portion 133e can be further improved by setting the inclination angle θ1 of the outer end portion 133eh2 of the fixing hole 133eh to 20 ° to 45 °.

  In Embodiment 1, the radial dimension LA of the crimping outer peripheral part 131gd of the crimping part 131g is increased to 0.5 mm or more (specifically, the radial dimension LA = 1.0 mm). It is possible to secure a sufficient weldable area between the caulking outer peripheral portion 131gd of the tightening portion 131g and the fixing portion outer peripheral portion 133ed of the fixing portion 133e. For this reason, when welding the crimping part 131g to the fixing | fixed part 133e, the crimping outer peripheral part 131gd of the crimping part 131g and the fixing | fixed part outer peripheral part 133ed of the fixing | fixed part 133e can be welded reliably. Therefore, the connection reliability between the caulking portion 131g and the fixing portion 133e can be further improved.

Next, a method for manufacturing the lithium secondary battery 100 will be described.
An electrode body 120 and element connecting members 131 and 131 are prepared. Then, the positive electrode element connecting member 131 and the negative electrode element connecting member 131 are welded to both ends of the electrode body 120 in the axial direction. Thereafter, the seal rubbers 160 and 160 are disposed in the insertion portions 131f and 131f of the element connection members 131 and 131, respectively. In addition, internal insulating members 170 and 170 are disposed on the radially outer sides of the seal rubbers 160 and 160, respectively. Furthermore, the case lid member 113 is disposed on each internal insulating member 170, 170, and the insertion portions 131 f and 131 f of the element connection members 131 and 131 are inserted into the terminal insertion holes 113 h and 113 h of the case lid member 113. .

  Next, the external insulating member 150 is disposed on the case lid member 113, and the externally disposed terminal member 133 and the fastening member 135 are further disposed thereon. At that time, the insertion portions 131f and 131f of the element connection members 131 and 131 are inserted into the fixing holes 133eh and 133eh of the fixing portions 133e and 133e of the externally arranged terminal members 133 and 133, respectively. Thereafter, portions of the element connection members 131 and 131 that protrude from the fixing holes 133eh and 133eh are swaged and enlarged to form swaged portions 131g and 131g.

  Thereafter, the caulking portion 131g of the element connecting member 131 is welded to the fixing portion 133e of the externally arranged terminal members 133 and 133. Specifically, the caulking outer peripheral portion 131gd of the caulking portion 131g and the fixed portion outer peripheral portion 133ed of the fixing portion 133e are welded to form the welded portion 132. This welding may be performed by laser welding or electron beam welding. At that time, it is possible to effectively suppress the occurrence of poor welding due to the occurrence of blowholes as described above, so that the crimping portion 131g and the fixing portion 133e can be reliably welded, and the connection reliability between them can be improved. In particular, it can be improved.

  Next, the electrode body 120 is inserted into the separately prepared insulating film enclosure 125. Thereafter, the case lid member 113 is disposed on the opening 111 h of the case body member 111 such that the electrode body 120 and the insulating film enclosure 125 are accommodated in the case body member 111. Then, the peripheral portion of the case lid member 113 and the peripheral edge of the opening 111h of the case main body member 111 are laser-welded. Thereafter, an electrolytic solution is injected into the battery case 110 from the liquid inlet portion 113m of the case lid member 113, and the liquid inlet portion 113m is sealed. Thus, the lithium secondary battery 100 is completed.

(Embodiment 2)
Next, a second embodiment will be described. In the lithium secondary battery 200 of the second embodiment, the form of the fixing hole 233eh of the fixing part 233e of the externally arranged terminal member 233 is different from the form of the fixing hole 133eh of the fixing part 133e of the externally arranged terminal member 133 of the first embodiment. Different. Other than that, it is basically the same as in the first embodiment, and therefore the description of the same parts as in the first embodiment is omitted or simplified. 6 to 8 show an externally arranged terminal member 233 according to the second embodiment.

The externally arranged terminal member 233 of the second embodiment includes a fixed portion 233e, an intermediate portion 133f, and an external connection portion 133g, and has a Z shape (step shape). Among these, the form of the intermediate part 133f and the external connection part 133g is the same as that of the first embodiment.
On the other hand, the fixing portion 233e has a plate shape having a fixing portion surface 233ea facing the side opposite to the case lid member 113 (upper side) and a fixing portion rear surface 213eb facing the case lid member 113 side (lower side). The fixing portion 233e is formed with a fixing hole 233eh that passes through the fixing portion 233e, and the insertion portion 131f of the element connection member 131 is inserted in the same manner as in the first embodiment.

The fixing hole 233eh is located on the case lid member 113 side (lower side), and is located on the opposite side (upper side) of the circular hole portion 233eh1 having a constant opening diameter and the case lid member 113 side. And an outer end portion 233eh2 having a tapered shape that linearly expands toward the outside of the battery (upward).
Of these, the outer end portion 233eh2 has two first outer end portions 233eh21 and 233eh21 and two second outer end portions 233eh22 and 233eh22 that are alternately arranged in the circumferential direction of the outer end portion 233eh2. An angle (inclination angle) θ11 formed between the first outer end portion 233eh1 and the central axis AX of the fixing hole 233eh is larger than an angle (inclination angle) θ12 formed between the second outer end portion 233eh2 and the central axis AX of the fixing hole 233eh. It has been enlarged. Specifically, the inclination angle of the first outer end portion 233eh21 is θ11 = 45 degrees, and the inclination angle of the second outer end portion 233eh22 is θ12 = 30 degrees.

  Further, a caulking portion 131g of the element connecting member 131 is connected to the fixing portion 233e by caulking and welding. Specifically, the caulking central portion 131gc of the caulking portion 131g abuts the outer end portion 233eh2 of the fixing hole 233eh of the fixing portion 233e without any gap by caulking, and the caulking outer peripheral portion 131gd of the caulking portion 131g Of the fixing portion 233e, the fixing portion 233e is positioned on the outer peripheral portion 233ed of the fixing portion that is positioned radially outward from the outer end portion 233eh2 of the fixing hole 233eh. And the crimping outer peripheral part 131gd of the crimping part 131g is welded to the fixing | fixed part outer peripheral part 233ed of the fixing | fixed part 233e. In the second embodiment, the welded portion 232 is formed on the radially outer side of the two second outer end portions 233eh22 and 233eh22 of the fixed hole 233eh in the fixed portion outer peripheral portion 233ed (two in total).

In the lithium secondary battery 200 of the second embodiment, the caulking portion 131g of the element connection member 131 is caulked and fixed to the fixing portion 233e of the externally arranged terminal member 233, and these are further welded. A sufficient connection strength can be secured, and an increase in these contact resistances can be prevented even when used for a long period of time.
Moreover, the caulking portion 131g and the fixing portion 233e are welded to each other only at the caulking outer peripheral portion 131gd of the caulking portion 131g and the fixing portion outer peripheral portion 233ed of the fixing portion 233e (FIG. 5). reference). For this reason, when welding the caulking portion 131g and the fixing portion 233e at the caulking outer peripheral portion 131gd and the fixing portion outer peripheral portion 233ed, the gas generated during welding moves radially outward through the gap between the two. Since it is easy to discharge | release outside, it can suppress that a blow hole generate | occur | produces at the time of welding and a welding defect arises. Therefore, since it is possible to reliably weld the caulking portion 131g and the fixing portion 233e, it is possible to particularly improve the connection reliability between them.

  Further, in the second embodiment, the outer end 233eh2 of the fixing hole 233eh is arranged in the circumferential direction with the first outer end 233eh21, 233eh21 and the second outer end 233eh22, 233eh22 having different inclination angles θ11, θ12. The directionality is given to the circumferential direction. For this reason, it can prevent effectively that the crimping part 131g of the element connection member 131 and the fixing | fixed part 233e of the external arrangement | positioning terminal member 233 rotate relatively.

  In the second embodiment, the inclination angle θ12 (specifically θ12 = 30 degrees) of the second outer end portion 233eh22 is greater than the inclination angle θ11 (specifically θ11 = 45 degrees) of the first outer end portion 233eh21. Therefore, the outer diameter of the second outer end 233eh22 is small. For this reason, on the outer side in the radial direction of the second outer end portion 233eh22, a sufficient weldable area can be secured between the caulking outer peripheral portion 131gd of the caulking portion 131g and the fixing portion outer peripheral portion 233ed of the fixing portion 233e. When welding the tightening portion 131g to the fixing portion 233e, the crimping outer peripheral portion 131gd of the crimping portion 131g and the fixing portion outer peripheral portion 233ed of the fixing portion 233e can be reliably welded. Therefore, the caulking part 131g and the fixing part 233e can be effectively prevented from rotating relatively, and the connection reliability between the caulking part 131g and the fixing part 233e can be further improved. In addition, the same parts as those of the first embodiment have the same effects.

(Embodiment 3)
Next, a third embodiment will be described. In the lithium secondary battery 300 of Embodiment 3, the form of the external connection portion 333g of the external placement terminal member 333 is different from the form of the external connection portion 133g of the external placement terminal member 133, 233 of Embodiments 1 and 2. Other than that, it is basically the same as in the first embodiment, and therefore, the description of the same parts as in the first embodiment is omitted or simplified. 9 and 10 show an externally arranged terminal member 333 according to the third embodiment.

The externally arranged terminal member 333 according to the third embodiment includes a fixed portion 133e, an intermediate portion 133f, and an external connection portion 333g, and has a Z shape (step shape). Among these, the form of the fixing | fixed part 133e and the intermediate part 133f is the same as that of the said Embodiment 1. FIG.
On the other hand, the external connection portion 333g has a plate shape having a connection portion surface 333ga facing the side opposite to the case lid member 113 (upper side) and a connection portion rear surface 333gb facing the case lid member 113 side (lower side). . The external connection portion 333g is connected to the intermediate portion 133f, extends along the case lid member 113, and is formed with a screw insertion hole 333gh penetrating through the external connection portion 333g.

  In the third embodiment, the external connection portion 333g is formed with a notch 333gj at a tip portion 333gs located on the side opposite to the fixed portion 133e side, and the external connection portion 333g is C-shaped in a plan view. And the front-end | tip parts 333gs and 333gs divided | segmented into two by the notch | incision part 333gj are processed so that it may become a level | step difference (height difference) in the direction (up-down direction) orthogonal to the case cover member 113. That is, one of the two divided tip portions 333gs and 333gs (left side in FIG. 10) is located on the case lid member 113 side (lower side), and the other (left side in FIG. 10) is the case. It is located on the opposite side (upper side) from the lid member 113 side.

  In this way, the two front end portions 333gs and 333gs of the external connection portion 333g are stepped so that an external connection terminal such as a bus bar is brought into contact with the connection portion surface 333ga, and a nut is attached to the male screw portion 135e of the fastening member 135. Etc., the nuts can be prevented from loosening. As a result, an increase in contact resistance between the external connection portion 333g and an external connection terminal can be suppressed, and problems such as abnormal heat generation of the lithium secondary battery 300 can be reliably prevented. And safety can be improved. In addition, the same parts as those in the first embodiment have the same effects as those in the first embodiment.

(Embodiment 4)
Next, a fourth embodiment will be described. A vehicle 700 according to the fourth embodiment includes a plurality of lithium secondary batteries (batteries) 100 according to the first embodiment. Specifically, as shown in FIG. 11, the vehicle 700 is a hybrid vehicle that is driven by using an engine 740, a front motor 720, and a rear motor 730 in combination. The vehicle 700 includes a vehicle body 790, an engine 740, a front motor 720, a rear motor 730, a cable 750, and an inverter 760 attached thereto. Further, the vehicle 700 includes an assembled battery 710 having a plurality of lithium secondary batteries 100 therein, and electric energy from the assembled battery 710 is used to drive the front motor 720 and the rear motor 730.

  As described above, the lithium secondary battery 100 can sufficiently secure the connection strength between the crimped portion 131g of the element connecting member 131 and the fixing portion 133e of the externally arranged terminal member 133, compared to the conventional case, and can be used for a long time. These contact resistances can be prevented from increasing even when used over a wide range. In addition, since the crimping portion 131g and the fixing portion 133e can be reliably welded, the connection reliability between them can be particularly improved. Therefore, the reliability of the vehicle 700 equipped with the lithium secondary battery 100 can be improved.

(Embodiment 5)
Next, a fifth embodiment will be described. The hammer drill 800 according to the fifth embodiment is a battery-operated device on which the battery pack 810 including the lithium secondary battery (battery) 100 according to the first embodiment is mounted. As shown in FIG. 12, this hammer drill 800 has a battery pack 810 accommodated in a bottom 821 of a main body 820, and this battery pack 810 is used as an energy source for driving the drill.

  As described above, the lithium secondary battery 100 can sufficiently secure the connection strength between the crimped portion 131g of the element connecting member 131 and the fixing portion 133e of the externally arranged terminal member 133, compared to the conventional case, and can be used for a long time. These contact resistances can be prevented from increasing even when used over a wide range. In addition, since the crimping portion 131g and the fixing portion 133e can be reliably welded, the connection reliability between them can be particularly improved. Therefore, the reliability of the hammer drill 800 on which the lithium secondary battery 100 is mounted can be improved.

In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first to fifth embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof. Yes.
For example, in the first to fifth embodiments, the lithium secondary batteries 100, 200, and 300 are exemplified as the battery. However, the present invention is applicable to other types of secondary batteries such as a nickel hydrogen battery and a nickel cadmium battery. Can be applied.
In the first to fifth embodiments, the batteries 100, 200, and 300 having the wound type power generation element (electrode body 120) are exemplified. However, the present invention is also applied to a battery having a stacked type power generation element. it can.

100, 200, 300 Lithium secondary battery (battery)
110 Battery case 111 Case body member 111h Opening 113 Case lid member 113h Terminal insertion hole 120 Electrode body (power generation element)
130 Positive Electrode Terminal Member (Electrode Terminal Member)
131 Element connection member 131e Element connection body 131f Insertion part 131g Clamping part 131gc Clamping center part 131gd Clamping outer peripheral part 132,232 Welding parts 133,233,333 Externally arranged terminal members 133e, 233e Fixing part 133ed, 233ed Fixing part Outer peripheral portion 133eh, 233eh Fixing hole 133eh1, 233eh1 Circular hole portion 133eh2, 233eh2 Outer end portion 233eh21 First outer end portion 233eh22 Second outer end portion 133f Intermediate portion 133g, 333g External connection portion 133gh, 333gh Screw insertion hole 135 Fastening member 135e Male screw part 135f Base part 140 Negative electrode terminal member (electrode terminal member)
150 External insulating member 160 Seal rubber 170 Internal insulating member 700 Vehicle 710 Battery assembly (battery)
800 Hammer drill (Battery-equipped equipment)
810 Battery pack (battery)
AX Center axis θ1, θ11, θ12 Inclination angle

Claims (7)

Power generation elements,
A battery case having an opening and housing the power generation element, and a case lid member that closes the opening of the case body member;
An electrode terminal member connected to the power generation element inside the battery case and extending onto the case lid member through a terminal insertion hole formed in the case lid member, and a battery comprising:
The electrode terminal member is
While connecting to the power generation element inside the battery case, an element connection member inserted through the terminal insertion hole of the case lid member,
An externally arranged terminal member connected to the element connecting member and positioned on the case lid member of the outside of the battery case;
The element connecting member is
An element connection main body located inside the battery case and connected to the power generation element;
The element connecting main body portion, the insertion portion inserted through the terminal insertion hole of the case lid member,
A caulking portion that is connected to the insertion portion, exposed to the outside of the battery, caulked and expanded in diameter to form an umbrella shape, and engages with the externally arranged terminal member,
The externally arranged terminal member is
A fixing portion that extends along the case lid member and is fixed to the case lid member, wherein the insertion portion of the element connection member is inserted into a fixing hole that penetrates the case lid member, and the element connection member Including a fixing portion with which the crimping portion is engaged,
The fixing hole of the fixing part is
A taper shape in which at least the outer end portion of the self expands toward the outside of the battery,
The caulking portion and the fixing portion are
Of the caulking portion, a caulking outer peripheral portion positioned radially outward from the outer end portion of the fixing hole, and of the fixing portion, radially outward from the outer end portion of the fixing hole. Batteries that are welded to each other only at the outer periphery of the fixed portion. The battery according to claim 1,
The outer end of the fixing hole is
A battery in which the angle formed with the central axis of the fixing hole is 20 to 45 degrees. The battery according to claim 1 or 2,
The caulking outer peripheral portion of the caulking portion is
A battery in which the radial dimension is 0.5 mm or more. The battery according to any one of claims 1 to 3,
The outer end of the fixing hole is
A first outer end portion and a second outer end portion arranged in a circumferential direction of the first outer end portion, and an angle formed by the first outer end portion and a central axis of the fixing hole is an angle between the second outer end portion and the second outer end portion; A battery having a first outer end and a second outer end that are made larger than an angle formed by the central axis of the fixing hole. The battery according to claim 4,
The caulking portion and the fixing portion are
A battery which is welded to each other only on the radially outer side of the second outer end portion of the fixing hole. A vehicle on which the battery according to any one of claims 1 to 5 is mounted and electric energy generated by the battery is used for all or part of a power source. A battery-operated device equipped with the battery according to any one of claims 1 to 5 and using the battery as at least one energy source.

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