JP2023146433A - Control valve type lead storage battery, and terminal for control valve type lead storage battery - Google Patents

Abstract

To suppress occurrence of trouble in a resin terminal hold member when connecting a connection member to a lower end of a terminal part in a control valve type lead storage battery.SOLUTION: The present invention relates to a control valve type lead storage battery 1 comprising: a battery jar 11 in which an electrode plate group 21 is accommodated; a lid 12 including a vertically penetrating through hole 18, the lid 12 closing an opening of the battery jar 11; a metallic electrode pole 30 inserted to the through hole 18; a terminal hold member 31 which includes an extension part 31A extending downward from a bottom face 15A while enclosing the through hole 18 and in which an intermediate portion 30M of the electrode pole 30 in a vertical direction is embedded in the extension part 31A, the resin terminal hold member 31 holding the electrode pole 30 while being fixed to the bottom face 15A of the lid 12; and a metallic strap 25 connected to a lower end of the electrode pole 30 and connecting the electrode plate group 21 with the electrode pole 30. An outer diameter of the extension part 31A becomes smaller continuously or step by step from an upper side to a lower side.SELECTED DRAWING: Figure 4

Description

The present invention relates to a valve-controlled lead-acid battery and a terminal for a valve-controlled lead-acid battery.

A lead-acid battery includes a terminal portion to which an external connection terminal is connected (see, for example, Patent Document 1). In the terminal part of the lead-acid battery described in Patent Document 1, the vertical middle part of the L-shaped pole is embedded in resin, and the strap (connection member) to which the power generation element is connected is attached to the horizontal part of the pole. Welded.

Japanese Patent Application Publication No. 8-148137

Incidentally, there are two types of lead-acid batteries: liquid-type lead-acid batteries in which the electrolyte is present as a liquid, and valve-controlled lead-acid batteries in which the electrolyte is absorbed by a separator. In the past, issues when applying a terminal section in which the vertical middle portion of a pole pole is embedded in resin to a valve-controlled lead-acid battery have not been sufficiently studied.
This specification discloses a technology related to the structure of a terminal portion including a terminal holding member made of resin in a valve-controlled lead-acid battery.

The valve-controlled lead-acid battery includes: a battery case in which a power generation element is housed; a lid part that closes an opening of the battery case and has a through hole penetrating vertically; A metal terminal portion inserted into the through hole, and a resin terminal holding member fixed to the lower surface of the lid portion to hold the terminal portion, the resin terminal holding member surrounding the through hole and extending from the lower surface. a terminal holding member having an extending portion extending downward and having a vertically intermediate portion of the terminal portion embedded in the extending portion; A metal connecting member connects the power generating element and the terminal portion, and the outer diameter of the extending portion decreases continuously or stepwise from the top to the bottom.

A perspective view of a valve-controlled lead-acid battery according to Embodiment 1. Exploded perspective view of battery case and lid Front view of lead-acid battery (partial cross-section) Cross-sectional view taken along line AA shown in Figure 3 Perspective view of terminal Cross section of terminal Perspective view of pole column Perspective view of terminal holding member Partial cross-section of lead-acid battery Schematic diagram (partial cross-section) showing terminals and power generation elements A perspective view of a terminal according to Embodiment 2 Perspective view of pole column Perspective view of terminal holding member Partial cross-section of lead-acid battery A perspective view of a terminal according to another embodiment A partial cross-sectional view of a lead-acid battery according to another embodiment

(Summary of this embodiment)
(1) The lead-acid battery according to the present disclosure is a valve-controlled lead-acid battery, and includes a battery case in which a power generating element is housed, and a lid part that closes an opening of the battery case, and has an upper and a lower part. A lid portion having a through hole, a metal terminal portion inserted into the through hole, and a resin terminal holding member fixed to a lower surface of the lid portion to hold the terminal portion. a terminal holding member having an extending portion surrounding the through hole and extending downward from the lower surface, and in which a vertically intermediate portion of the terminal portion is embedded in the extending portion; a metal connecting member connected to a lower end of the section and connecting the power generating element and the terminal section, the outer diameter of the extending section being continuous or continuous from top to bottom. It is getting smaller gradually.

In general, with liquid type lead-acid batteries, a certain amount of vertical distance is secured between the bottom surface of the lid and the power generation element, whereas in valve control type batteries, there is a vertical distance between the bottom surface of the lid and the power generation element. can be shorter than the liquid type.
By the way, a lead-acid battery has a terminal section fixed to the top surface of the lid section. On the other hand, as disclosed in FIG. 2 of JP-A No. 2015-118805, for example, in a liquid lead-acid battery, a terminal portion is integrally formed with a lid portion by insert molding.

Furthermore, conventionally, a terminal part is embedded in resin (corresponding to a terminal holding member) as in the terminal part described in Patent Document 1, and the terminal holding member is fixed to the lower surface of the lid part.
However, when using the above-mentioned terminal holding member, it is difficult to construct the terminal portion from a single member. For this reason, as described in Patent Document 1, the strap (corresponding to the connecting member) to which the power generation element is connected is molded as a separate part, and the pole pole (corresponding to the terminal part) and the strap are welded. things are being done. Specifically, for example, the terminal portion is fixed to the lid portion in the following steps.
Step 1: A connecting member with an integrated power generation element is molded.
Step 2: The power generation element connected to the connection member is inserted into the battery case.
Step 3: The connection member to which the power generation element is connected is connected by welding to the lower end of the terminal portion whose intermediate portion is embedded in the terminal holding member. At this time, welding is performed while the power generating element is connected to the connecting member.
Step 4: The terminal holding member is fixed to the lid part from below.

The inventor of the present application has discovered that when the terminal portion described in Patent Document 1 mentioned above is applied to a valve-controlled lead-acid battery, the resin (terminal holding member) may melt in the above-mentioned step 3. Specifically, as mentioned above, in valve-controlled lead-acid batteries, the vertical distance between the bottom surface of the lid and the power generation element is short, so when welding the pole pole and the strap, the resin and the welding point are becomes closer in the vertical direction. In addition, since the resin described in Patent Document 1 has a constant outer diameter from top to bottom, the horizontal distance between the resin and the welding location becomes short. Therefore, the resin may melt due to the heat of welding. Although it is possible to secure the distance by horizontally separating the resin and the welding location, in that case, there is a problem that the terminal portion becomes large.

According to the valve-controlled lead-acid battery according to the present disclosure, the outer diameter of the extending portion of the terminal holding member that extends downward from the lower surface of the lid portion decreases continuously or stepwise from the top to the bottom. Therefore, the distance between the lower end of the terminal holding member and the welding location can be increased. Therefore, in the valve-controlled lead-acid battery, it is possible to prevent the resin terminal holding member from melting due to welding heat when connecting the connecting member to the lower end of the terminal portion.

(2) In the terminal portion, an outer diameter of a portion above the upper surface of the lid portion may be continuously decreased from bottom to top over the entire height of the upper portion.

According to the valve-controlled lead-acid battery according to the present disclosure, in the so-called tapered terminal portion, it is possible to suppress melting of the resin terminal holding member due to heat when welding the connecting member to the lower end portion of the terminal portion.

(3) The outer diameter of the intermediate portion may decrease continuously or stepwise from top to bottom.

According to the valve-controlled lead-acid battery according to the present disclosure, the outer diameter of the intermediate portion decreases continuously or stepwise from top to bottom, so that when the outer diameter of the intermediate portion is constant vertically, In comparison, the outer diameter of the lower end of the terminal holding member can be made smaller. Therefore, it is possible to further suppress melting of the resin terminal holding member due to the heat generated when the connecting member is welded to the lower end portion of the terminal portion.

In valve-controlled lead-acid batteries, the electrolyte seeps into the separator, and although it does not exist as a liquid, the electrolyte that has seeped into the separator may creep up between the terminal holding member and the terminal part. According to the valve-controlled lead-acid battery according to the present disclosure, the outer diameter of the intermediate portion decreases continuously or stepwise from top to bottom, so that when the outer diameter of the intermediate portion is constant vertically, Compared to this, the creepage distance of the intermediate portion can be increased. Therefore, there is an effect that the electrolyte can be prevented from creeping up between the terminal holding member and the terminal portion.

(4) A plurality of flange portions are formed spaced apart vertically from the intermediate portion in an annular shape outward in the radial direction, and the uppermost flange portion has the largest outer diameter, and the lowermost flange portion has the largest outer diameter. may have the smallest outer diameter.

According to the valve-controlled lead-acid battery according to the present disclosure, since the creepage distance of the intermediate portion can be increased by providing the flange portion, it is possible to suppress the electrolyte from creeping up between the terminal holding member and the terminal portion. Further, according to the valve-controlled lead-acid battery according to the present disclosure, the outer diameter of the uppermost flange is the largest, and the outer diameter of the lowermost flange is the smallest, so that the electrolyte flows upward. It becomes difficult to rise.

(5) At least one of the flange portions may have a circular shape when viewed from above, and a rotation preventing protrusion may be formed on the outer peripheral surface.

According to the valve-controlled lead-acid battery according to the present disclosure, since the anti-rotation protrusion is formed on the outer circumferential surface of the flange portion, when an external connection terminal is connected to the terminal portion, the terminal is held against the terminal holding member. It is possible to restrict the relative rotation of the parts.

(6) At least one of the flange portions may be non-circular in top view.

According to the valve-controlled lead-acid battery according to the present disclosure, since the flange portion is non-circular in top view and has a rotation prevention function, when an external connection terminal is connected to the terminal portion, the terminal Relative rotation of the terminal portion with respect to the holding member can be restricted.

(7) The cross section of the intermediate portion may be non-circular.

According to the valve-controlled lead-acid battery according to the present disclosure, it is possible to restrict relative rotation of the terminal portion with respect to the terminal holding member when an external connection terminal is connected to the terminal portion.

(8) The terminal according to the present disclosure is a terminal for a valve-controlled lead-acid battery, and includes a terminal portion and a resin terminal holding member in which a vertically intermediate portion of the terminal portion is embedded. , the outer diameter of the terminal holding member decreases continuously or stepwise from top to bottom.

According to the valve-controlled lead-acid battery terminal according to the present disclosure, the resin terminal holding member melts due to the heat generated when the connecting member that electrically connects the power generating element and the terminal portion is welded to the lower end portion of the terminal portion. can be suppressed.

<Embodiment 1>
Embodiment 1 will be described with reference to FIGS. 1 to 10. In the following description, the front-back direction, left-right direction, and up-down direction are based on the front-back direction, left-right direction, and up-down direction shown in FIG. In the following description, reference numerals in the drawings may be omitted for the same components except for some.

(1) Structure of lead-acid battery The structure of lead-acid battery 1 according to Embodiment 1 will be described with reference to FIG. 1. The lead-acid battery 1 is a lead-acid battery for auxiliary equipment that is installed in an automobile and supplies power to various auxiliary equipment (electric power steering, electric brake, headlight, air conditioner, etc.). The lead acid battery 1 is of a valve control type.

The lead acid battery 1 includes a synthetic resin container 11, a synthetic resin lid 12, a positive external terminal 13P (an example of a terminal), and a negative external terminal 13N (an example of a terminal).
The battery case 11 has four outer walls 14 and a bottom wall, and is box-shaped with an open top.
The lid part 12 is thermally welded (heat-sealed) to the battery case 11 and closes the opening 11A (see FIG. 2) of the battery case 11. The lid portion 12 includes a flat plate portion 15, an overhanging portion 16 extending upward from the flat plate portion 15 in a substantially T-shape, and an outer peripheral wall 17 formed along the outer peripheral edge of the flat plate portion 15. An exhaust passage is formed inside the projecting portion 16 to exhaust gas generated in each cell chamber 20 (see FIG. 2) to the outside. The outer peripheral wall 17 extends downward from the outer peripheral edge of the flat plate portion 15 and surrounds the upper end of the outer wall 14 of the battery case 11.

Through-holes 18 are formed in the two corners of the lid part 12 where the projecting parts 16 are not formed, which vertically penetrate the flat plate part 15. The positive external terminal 13P is inserted into the left through hole 18 and extends to the inside of the battery case 11. The negative external terminal 13N is inserted into the through hole 18 on the right side and extends to the inside of the battery case 11. External connection terminals such as harness terminals are connected to these external terminals 13P and 13N.

As shown in FIG. 2, the inside of the battery case 11 is partitioned into six cell chambers 20 by five partition walls 19. As shown in FIG. 3, each cell chamber 20 accommodates an electrode plate group 21 (an example of a power generation element) and an electrolytic solution made of dilute sulfuric acid. The electrode plate group 21 is made up of positive electrode plates 22P and negative electrode plates 22N alternately stacked in the horizontal direction with separators 23 interposed therebetween. Each of the electrode plates 22P and 22N has a grid filled with an active material. As described above, since the lead-acid battery 1 is of the control valve type, the electrolytic solution permeates into the separator 23.

As shown in FIGS. 3 and 4, ears 24 (24P, 24N) are provided at the upper part of each electrode plate 22P, 22N. Polar plates 22 of the same polarity within one cell chamber 20 have tabs 24 connected to each other by a lead alloy strap 25 (an example of a connecting member). A strap 25 for a positive electrode and a strap for a negative electrode are provided for each cell chamber 20. The positive and negative straps 25 of adjacent cell chambers 20 are connected by welding through holes 26 (see FIG. 2) formed in the partition wall 19. Thereby, the electrode plate groups 21 of each cell chamber 20 are connected.

As shown in FIG. 4, the strap 25 connected to the negative electrode plate 22N of the rightmost cell chamber 20 is connected to the negative electrode external terminal 13N by welding. Although not shown in the figure, the strap 25 connected to the positive electrode plate 22P of the leftmost cell chamber 20 is connected to the positive external terminal 13P by welding.

(2) Positive External Terminal and Negative External Terminal Since the positive external terminal 13P and the negative external terminal 13N are substantially the same, the negative external terminal 13N will be explained here as an example.
As shown in FIG. 5, the negative external terminal 13N includes a pole post 30 (an example of a terminal portion) made of metal such as a lead alloy, and a terminal holding member 31 made of resin. As shown in FIG. 4, the terminal holding member 31 is fixed from below to the lower surface 15A of the flat plate portion 15 of the lid portion 12 to hold the pole post 30.

(2-1) Pole Post As shown in FIG. 6, the pole post 30 includes an upper portion 30U to which an external connection terminal is connected, a middle portion 30M embedded in the terminal holding member 31, and a strap 25 to which the strap 25 is welded. The lower part 30L consists of three parts.
The upper portion 30U extends upward in a cylindrical shape. The upper portion 30U has a tapered shape, and the outer diameter decreases continuously from the bottom to the top over the entire height of the upper portion 30U. The upper portion 30U may have a tapered shape only in the portion above the upper surface 15B (see FIG. 1) of the flat plate portion 15.

The intermediate portion 30M also has a circular cross section, and the outer diameter decreases stepwise from top to bottom. An annularly projecting flange portion 32 is formed on the outer circumferential surface of the intermediate portion 30M in each step. The flange portion 32 is circular in top view. Providing the flange portion 32 increases the creepage distance in the vertical direction, so that it is possible to suppress the electrolyte from creeping up between the terminal holding member 31 and the pole post 30.

Among the plurality of flange parts 32, the uppermost flange part 32 has the largest outer diameter, and the lowermost flange part 32 has the smallest outer diameter. The diameter of the uppermost flange portion 32 is larger than the inner diameter of the through hole 18 formed in the lid portion 12.
The lower portion 30L is formed in an L-shape having a portion 33 extending in the vertical direction and a portion 34 extending in the horizontal direction from the lower end of the portion 33 extending in the vertical direction. A strap 25 is welded to the tip of the horizontally extending portion 34.

As shown in FIG. 7, a plurality of protrusions 35 are integrally formed on the outer peripheral surface of the uppermost flange portion 32 at equal intervals in the circumferential direction. The protrusion 35 has a rotation preventing role that restricts relative rotation of the pole post 30 with respect to the terminal holding member 31 when an external connection terminal is connected to the upper portion 30U of the pole post 30.

(2-2) Terminal Holding Member The terminal holding member 31 will be explained with reference to FIG. The terminal holding member 31 is manufactured by pouring resin into a mold into which the middle portion 30M of the pole post 30 is inserted and integrally molding it. Since the intermediate portion 30M of the pole post 30 and the terminal holding member 31 are integrally molded, the intermediate portion 30M is embedded in the terminal holding member 31. However, the uppermost flange portion 32 is not completely embedded in the terminal holding member 31, and its upper surface is exposed.

FIG. 8 shows only the terminal holding member 31. As described above, since the uppermost flange portion 32 is not completely embedded in the terminal holding member 31, the terminal holding member 31 has an upwardly open shape. As described above, since the projection 35 is formed on the outer peripheral surface of the uppermost flange portion 32, the projection 35 is formed on the inner peripheral surface of the terminal holding member 31 on the surface facing the outer peripheral surface of the uppermost flange portion 32. A plurality of recesses 36 into which are fitted are formed.

With reference to FIG. 9, fixing of the terminal holding member 31 to the lid portion 12 will be described. The terminal holding member 31 is heat-welded to the flat plate portion 15 of the lid portion 12 from below. In FIG. 9, the holding member melting margin 42 is the resin of the terminal holding member 31 that melted when the terminal holding member 31 was thermally welded to the lid portion 12. The resin escape allowance 43 is the resin of the lid part 12 or the resin of the terminal holding member 31 that melts when the terminal holding member 31 is welded to the lid part 12. The resin clearance 43 before the terminal holding member 31 is welded to the lid portion 12 is hollow.

When the terminal holding member 31 is thermally welded to the lid 12, the terminal holding member 31 surrounds the through hole 18 of the lid 12 and extends downward from the lower surface 15A of the lid 12. In the terminal holding member 31, the outer diameter of a portion 31A extending downward from the lower surface 15A of the flat plate portion 15 of the lid portion 12 decreases in steps from top to bottom. In the following description, the downwardly extending portion 31A will be referred to as an extending portion 31A.

(3) Lead-acid battery manufacturing process The negative external terminal 13N is fixed to the lid part 12 in the following procedure.
Step 1: A strap 25 with an integrated power generation element is molded. Specifically, each electrode plate 22 is held with the ears 24 facing down, and with the ears 24 inserted into the mold, molten lead alloy is poured into the mold, so that the ears 24 are embedded. A strap 25 is formed.

Step 2: Each electrode plate 22 connected to the strap 25 is inserted into the battery case 11.
Step 3: As shown in FIG. 10, the strap 25 is welded by a welding machine 50 to the horizontally extending portion 34 of the pole pole 30 with which the terminal holding member 31 is integrally formed. Since the ear portion 24 of the electrode plate 22 is welded to the lower side of the horizontally extending portion 34, the strap 25 is attached to the side opposite to the side to which the electrode plate 22 is connected (the upper side in the example shown in FIG. 10). ) to be welded.
Step 4: The terminal holding member 31 is thermally welded (heat-sealed) to the lid portion 12.

(4) Effects of Embodiment As shown in FIG. 10, according to the lead-acid battery 1 according to the first embodiment, the outer diameter of the extending portion 31A extending downward from the lower surface 15A of the lid portion 12 in the terminal holding member 31 is gradually reduced from top to bottom, making it possible to increase the distance between the lower end of the terminal holding member 31 and the welding location. Therefore, when the strap 25 is welded to the lower end of the pole post 30, it is possible to prevent the resin terminal holding member 31 from melting due to the heat of welding.

According to the lead-acid battery 1, in the tapered pole pole 30, melting of the resin terminal holding member 31 due to the heat generated when the strap 25 is welded to the lower end of the pole pole 30 can be suppressed.

According to the lead-acid battery 1, the outer diameter of the intermediate portion 30M gradually decreases from top to bottom, so that the lower end of the terminal holding member 31 is smaller than the case where the outer diameter of the intermediate portion 30M is constant vertically. The outer diameter of the part can be made smaller. Therefore, melting of the resin terminal holding member 31 due to the heat generated when the strap 25 is welded to the lower end of the pole post 30 can be further suppressed.
When the outer diameter of the intermediate portion 30M decreases stepwise from top to bottom, the creepage distance of the intermediate portion 30M can be made longer than when the outer diameter of the intermediate portion 30M is constant vertically. Therefore, there is an effect that the electrolyte can be prevented from creeping up between the terminal holding member 31 and the pole post 30.

According to the lead-acid battery 1, since the plurality of flange portions 32 are vertically spaced apart from each other in the intermediate portion 30M, it is possible to suppress the electrolyte from creeping up between the terminal holding member 31 and the pole post 30. Furthermore, according to the lead-acid battery 1, the outer diameter of the uppermost flange portion 32 is the largest, and the outer diameter of the lowermost flange portion 32 is the smallest, so that the electrolyte becomes more difficult to creep up as it goes upward.

According to the lead-acid battery 1, since the anti-rotation protrusion 35 is formed on the outer circumferential surface of the uppermost flange portion 32, when an external connection terminal is connected to the pole post 30, the pole is fixed to the terminal holding member 31. Relative rotation of the pillar 30 can be restricted.

According to the positive external terminal 13P and the negative external terminal 13N according to the first embodiment, melting of the resin terminal holding member 31 due to the heat generated when the strap 25 is welded to the lower end of the pole post 30 can be suppressed.

<Embodiment 2>
Embodiment 2 will be described with reference to FIGS. 11 to 14. In the following description, components that are substantially the same as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.
As shown in FIGS. 11 and 12, in the pole column 230 according to the second embodiment, the uppermost flange portion 232 has a non-circular shape when viewed from above. Specifically, the uppermost flange portion 232 has a rectangular shape when viewed from above. No protrusion is formed on the outer peripheral surface of the uppermost flange portion 232 of the pole column 230. This is because the uppermost flange portion 232 has a non-circular shape, so that the flange portion 232 itself has a rotation prevention function. The shape of the other flange portion 232 formed in the intermediate portion 30M is circular as in the first embodiment.

As shown in FIG. 13, the terminal holding member 231 according to the second embodiment has a rectangular opening at the top. In the pole column 230 according to the second embodiment, the upper portion of the intermediate portion 30M has a non-circular cross section. Specifically, the cross section of the upper portion of the intermediate portion 30M has a so-called racetrack shape consisting of two parallel straight lines and two semicircles. Therefore, the inner peripheral shape of the portion 231B of the terminal holding member 231 in which the upper portion of the intermediate portion 30M is embedded also has a racetrack shape.

As shown in FIG. 14, in the terminal holding member 231 according to the second embodiment, the outer diameter of the extending portion 231A extending downward from the lower surface 15A of the flat plate portion 15 of the lid portion 12 is graded from top to bottom. It has become smaller.
Embodiment 2 is substantially the same as Embodiment 1 in other respects.

According to the lead-acid battery according to the second embodiment, since the flange portion 232 is non-circular in top view and has a rotation prevention function, when an external connection terminal is connected to the pole post 230, the terminal can be held. Relative rotation of the pole post 230 with respect to the member 231 can be restricted.

According to the lead-acid battery according to the second embodiment, since the cross section of the upper part of the intermediate portion 30M of the pole post 230 is non-circular, when an external connection terminal is connected to the pole post 230, the terminal holding member 231 is Therefore, relative rotation of the pole post 230 can be further restricted.

<Other embodiments>
The present invention is not limited to the embodiments described above and illustrated in the drawings; for example, the following embodiments are also included within the technical scope of the present invention.

(1) In the above embodiment, the outer diameter of the extending portion 31A of the terminal holding member 31 is gradually decreased from the top to the bottom. It may become smaller continuously from the bottom.

(2) In the above embodiment, the outer diameter of the intermediate portion 30M gradually decreases from top to bottom, but the outer diameter of the intermediate portion 30M decreases continuously from top to bottom. It may be smaller.
In the embodiment described above, the outer diameter of the intermediate portion 30M decreases from top to bottom, but the outer diameter of the intermediate portion 30M may be constant vertically.

(3) In the above embodiment, the upper portion 30U of the pole column 30 (in other words, the portion to which an external connection terminal is connected) is cylindrical. On the other hand, the shape of the upper portion 330U may be box-shaped like the positive electrode external terminal 313P shown in FIG. 15, or may have another shape.

(4) In the above embodiment, the pole post 30 is used as an example of the terminal portion. On the other hand, the terminal portion may be composed of a bushing 401 and a pole post 430, like a terminal portion 413P shown in FIG. The bushing 401 is made of metal such as copper alloy and has a cylindrical shape. The pole post 430 is inserted into the bushing 401 and welded to the bushing 401.

(5) In the second embodiment, the flange portion 232 which is rectangular in top view is used as an example of the non-circular flange portion 232. However, the non-circular flange portion 232 is not limited to a rectangular shape, and may be, for example, triangular, pentagonal, or elliptical.

(6) In the second embodiment, the cross section of the upper portion of the middle portion 30M of the pole column 230 is explained using a racetrack shape as an example of a non-circular cross section, but the cross section of the middle portion 30M may be oval, square, etc. There may be. If there is no need to prevent rotation due to the shape of the intermediate portion 30M, the cross section of the intermediate portion 30M may be circular.

(7) In the second embodiment, the lower end of the terminal holding member 31 and the strap 25 are connected by welding, but they may be connected by soldering, for example.

(8) In the above embodiment, the lead-acid battery 1 for auxiliary equipment installed in an automobile has been described as an example, but the use of the lead-acid battery 1 is not limited to this, and can be used for any purpose.

1: Lead-acid battery 11: Battery case 11A: Opening 12: Lid 13N: Negative external terminal (an example of a terminal)
13P: Positive external terminal (an example of a terminal)
15A: Lower surface 15B: Upper surface 18: Through hole 21: Pole plate group (an example of power generation element)
25: Strap (an example of a connecting member)
30: Pole pole (an example of a terminal part)
30M: Intermediate portion 31: Terminal holding member 31A: Extension portion 32: Flange portion 35: Projection 213P: Positive external terminal (an example of a terminal)
230: Pole post 231: Terminal holding member 231A: Extension portion 232: Flange portion 313P: Positive external terminal (an example of a terminal)
401: Bushing (an example of a terminal part)
430: Pole pole (an example of a terminal part)

Claims (8)

A valve-controlled lead-acid battery,
A battery case containing a power generation element,
a lid that closes the opening of the battery case and has a through hole that passes through the battery case vertically;
a metal terminal portion inserted into the through hole;
A terminal holding member made of resin that is fixed to the lower surface of the lid portion and holds the terminal portion, the terminal holding member having an extension portion surrounding the through hole and extending downward from the lower surface; a terminal holding member in which a vertically intermediate portion of the terminal portion is embedded in the extending portion;
a metal connecting member connected to the lower end of the terminal section and connecting the power generation element and the terminal section;
Equipped with
A valve-controlled lead-acid battery, wherein the outer diameter of the extending portion decreases continuously or stepwise from top to bottom. The valve-controlled lead-acid battery according to claim 1,
The terminal portion is a valve-controlled lead-acid battery, wherein the outer diameter of the portion above the top surface of the lid portion continuously decreases from bottom to top over the entire height of the top portion. The valve-controlled lead-acid battery according to claim 1 or 2,
The intermediate portion is a valve-controlled lead-acid battery in which the outer diameter decreases continuously or stepwise from top to bottom. The valve-controlled lead-acid battery according to any one of claims 1 to 3,
A plurality of flange portions are formed spaced apart vertically from the intermediate portion in an annular shape outward in the radial direction, and the outer diameter of the uppermost flange portion is the largest, and the outer diameter of the lowermost flange portion is the largest. is the smallest valve-controlled lead-acid battery. The valve-controlled lead-acid battery according to claim 4,
A valve-controlled lead-acid battery, wherein at least one of the flange portions is circular in top view, and a rotation prevention protrusion is formed on the outer peripheral surface. The valve-controlled lead-acid battery according to claim 4,
A valve-controlled lead-acid battery, wherein at least one of the flange portions is non-circular in top view. The valve-controlled lead-acid battery according to any one of claims 1 to 6,
A valve-controlled lead-acid battery, wherein the middle portion has a non-circular cross section. A terminal for a valve-controlled lead-acid battery,
A metal terminal part,
a resin terminal holding member in which a vertically intermediate portion of the terminal portion is embedded;
Equipped with
A terminal for a valve-controlled lead-acid battery, wherein the outer diameter of the terminal holding member decreases continuously or stepwise from top to bottom.

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