JP2019109965A - Lead acid battery - Google Patents

Abstract

To improve life properties while circumventing characteristic deterioration of lead acid battery.SOLUTION: A collector constituting the electrode plate of a lead acid battery has a frame, an ear part provided in the first frame bone, and an inner part. The inner part has a first inner bone group constituted of first N1 inner bones connecting two frame bones for connection with the first frame bone, and a second inner bone group constituted of second N2 inner bones connecting the first frame bone and one frame bone facing the first frame bone. The second inner bone group includes n2 big inner bones having a cross sectional area S2 satisfying 0.35×T0≤S2≤0.65×T0(T0 is the thickness of the frame part), and the first inner bone group includes n1 fine bones having a cross sectional area S1 satisfying 0.077×S2 max≤S1≤0.125×S2 max(S2 max is the maximum value of cross sectional area of the big inner bone). The ratio of n2 to N2 is 0.7 or more, and the ratio of n1 to N1 is 0.7 or more.SELECTED DRAWING: Figure 7

Description

  The technology disclosed herein relates to a lead-acid battery.

  Lead storage batteries are widely used as secondary batteries. For example, lead storage batteries are used as emergency power supplies for buildings and the like.

  The lead storage battery comprises a positive electrode plate and a negative electrode plate. The positive electrode plate and the negative electrode plate each have a current collector and an active material supported by the current collector. The current collector includes a substantially square frame portion formed of four frame bones, an ear portion provided on one frame bone, and an inner portion provided on the inner side of the frame portion. The inner part has a plurality of internal bones (see, for example, Patent Document 1).

JP 2012-79706 A

  When the lead-acid battery is used for a long time, it is cut off by corrosion of the inner bone that constitutes the inner part of the current collector, and as a result, the capacity decreases and the life is reached. In conventional lead acid batteries, it is desirable to further extend the life while avoiding the deterioration of other characteristics.

  Disclosed herein are techniques that can improve the life characteristics of lead acid batteries while avoiding degradation of other properties of lead acid batteries.

The lead storage battery disclosed herein comprises an electrode plate having a current collector and an electrode material supported by the current collector, and the current collector includes four first frames. A frame having a substantially rectangular shape in a first direction, an ear provided on the first frame, and an inner part provided on the inner side of the frame The first inner bone group composed of N1 first inner bones connecting between the two frame bones connected to the first frame bone; A second inner bone group composed of N2 second inner bones connecting between the first frame and the one frame opposite to the first frame; In the inner bone group, the cross-sectional area S2 of the cross section orthogonal to the drawing direction is 0.35 × T0 ² ≦ S 2 ≦ 0.65 × T 0 ² (where T 0 is the thickness of the frame in the first direction) Meet the relationship The first inner bone group includes n2 inner bones, and the first inner bone group has a cross-sectional area S1 of 0.077 × S2max ≦ S1 ≦ 0.125 × S2max (where S2max is the thick) The number n2 of the inner bones relative to the number N2 of the second inner bones constituting the second inner bone group, including n1 inner bones satisfying the relationship of the maximum value of the cross-sectional area of the inner bones) Ratio (n2 / N2) is 0.7 or more, and the ratio (n1 / N1) of the number n1 of the subendothelial bones to the number N1 of the first inner bones constituting the first inner bone group ) Is 0.7 or more.

It is a front view which shows the external appearance structure of the lead storage battery 100 in this embodiment. It is a top view which shows the external appearance structure of the lead storage battery 100 in this embodiment. It is a top view which shows the internal structure of the lead storage battery 100 in this embodiment. It is explanatory drawing which shows YZ cross-section structure of the lead storage battery 100 in the position of IV-IV of FIG. It is explanatory drawing which shows YZ cross-section structure of the lead storage battery 100 in the position of VV of FIG. It is explanatory drawing which shows the XZ cross-sectional structure of a part of lead acid battery 100 in the position of VI-VI of FIG. FIG. 6 is an explanatory view showing a YZ plane configuration of a positive electrode current collector 212. It is explanatory drawing which shows XY sectional structure of the positive electrode collector 212 in the position of VIII-VIII of FIG. It is explanatory drawing which shows the XZ cross-section structure of the positive electrode collector 212 in the position of IX-IX of FIG. It is explanatory drawing which shows a performance evaluation result. It is explanatory drawing which shows a performance evaluation result. It is explanatory drawing which shows a performance evaluation result. It is explanatory drawing which shows a performance evaluation result.

  The techniques disclosed herein can be implemented as the following forms.

(1) The lead-acid battery disclosed in the present specification is a lead-acid battery, and comprises an electrode plate having a current collector and an electrode material supported by the current collector, the current collector comprising: It comprises four frame bones including a first frame bone, and is provided inside the frame part, a substantially square frame part in a first direction view, an ear part provided on the first frame bone, and the like. A first inner bone formed of N1 first inner bones connecting between the two frame bones connected to the first frame bone. A second inner bone group comprising an inner bone group, and N2 second inner bones connecting between the first frame bone and one of the frame bones facing the first frame bone And the second inner bone group has a cross-sectional area S2 of a cross section orthogonal to the drawing direction of 0.35 × T0 ² ≦ S 2 ≦ 0.65 × T 0 ² (where T 0 is the first number). Frame in the direction of And the first inner bone group has a cross-sectional area S1 of a cross section orthogonal to the extending direction, 0.077 × S2max ≦ S1 ≦ 0.125 × S2max The ratio (n2 / N2) of the number n2 of the inner bones to the number N2 of the second inner bones comprising the n1 inner bones satisfying the relationship: The ratio (n1 / N1) of the number n1 of the subendothelial bones to the number N1 of the first inner bones constituting the first inner bone group is 0.7 or more. .

Thus, in the present lead-acid battery, a relatively high ratio (more than 70%) of the N2 second inner bones, which are inner bones in the direction toward the first frame bone provided with the ear The bone is considered to be a taikei bone having a large cross-sectional area S2 (where S2 ≧ 0.35 × T0 ² ) without causing a decrease in castability. Therefore, even if the lead-acid battery is used for a long time and corrosion of the inner bone progresses, the second inner bone which is the inner bone in the direction toward the first frame provided with the ear is cut off. As a result, the decrease in capacity can be suppressed, and the life characteristics can be improved.

  Further, in the present lead-acid battery, due to the presence of the inner bone, there is a concern about an increase in the weight of the current collector and, consequently, an increase in the weight of the lead-acid battery. However, the inner bone of N1 first inner bones, which is the inner bone connecting between the two frame bones connected to the first frame bone (ie, the inner bone having a small influence on the volume even if it is cut) And a relatively high proportion (70% or more) of the inner bone has a small cross-sectional area S1 within a range not accompanied by a decrease in the castability and the fillability of the active material (0.077 × S2max ≦ S1 ≦ 0.125 × S2max There is an intraosseous bone. Therefore, the effect of the increase in the weight of the current collector due to the presence of the inner bone can be compensated by the presence of the inner bone, and the increase in the weight of the current collector as a whole can be suppressed. The increase can be suppressed. Therefore, according to the lead storage battery, it is possible to improve the life characteristics of the lead storage battery while avoiding the deterioration of other characteristics (weight characteristics, filling property, casting property) of the lead storage battery.

(2) In the lead storage battery, a ratio of a width W2 in a direction orthogonal to both the first direction and the extension direction of the inner bone to a thickness T2 in the first direction of the inner bone (W2 / T2) may be configured to be 0.9 or more and 1.1 or less. According to this lead-acid battery, the shape of the cross section orthogonal to the extension direction of the inner bone can be made close to an ideal circular shape in terms of cutting prevention, and the inner bone is corroded and cut off Can be effectively suppressed, and the life characteristics of the lead storage battery can be effectively improved. When the ratio (W2 / T2) of the width W2 to the thickness T2 of the inner bone is 0.9 or more and 1.1 or less, the cross-sectional area S2 of the inner bone tends to increase, and thus the current collector The weight tends to increase. However, in the present lead-acid battery, since a relatively high proportion (more than 70%) of the first inner bone is a narrow inner bone, the increase in weight of the current collector as a whole is suppressed while The cross-sectional shape can be made an ideal shape (a shape in which W2 / T2 is 0.9 or more and 1.1 or less) in terms of corrosion prevention, and the life characteristics of the lead storage battery can be effectively improved. It is

A. Embodiment:
A-1. Basic configuration:
(Configuration of lead storage battery 100)
FIG. 1 is a front view showing an appearance configuration of the lead storage battery 100 in the present embodiment, FIG. 2 is a top view showing an appearance configuration of the lead storage battery 100, and FIG. 3 shows an internal configuration of the lead storage battery 100. It is a top view (figure which shows the state which removed the lid 14 mentioned later), FIG. 4 is explanatory drawing which shows YZ cross-section structure of the lead storage battery 100 in the position of IV-IV of FIG. FIG. 6 is an explanatory view showing a YZ cross-sectional configuration of the lead storage battery 100 at the V-V position of 2 and FIG. 6 is an explanatory view showing an XZ cross-sectional configuration of a part of the lead storage battery 100 at the position VI-VI of FIG. 3 . For convenience of illustration, only a part (three) of a plurality of electrode plate groups 20 (and straps 52 and 54 connected thereto) which will be described later are shown in FIG. 3 and FIG. 4 and FIG. In FIG. 5, a part of the configuration is omitted so that the configuration of the electrode group 20 can be easily understood. In each figure, mutually orthogonal XYZ axes for specifying the direction are shown. In this specification, for convenience, the positive direction of the Z-axis is referred to as "upward" and the negative direction of the Z-axis is referred to as "downward". However, the lead storage battery 100 is actually different from such an orientation. It may be installed in the direction.

  The lead storage battery 100 of the present embodiment is a control valve type lead storage battery (sealed lead storage battery). The control valve type lead-acid battery has a high degree of freedom in the installation attitude since it does not have the electrolyte flowing inside, and maintenance is easy because it is not necessary to check the liquid amount and refill water. It is used as a power supply of a blackout power supply device, a communication base station, a two-wheeled vehicle, etc. The lead storage battery 100 includes a housing 10, a positive electrode terminal member 30, a negative electrode terminal member 40, and a plurality of electrode plate groups 20. Hereinafter, the positive electrode terminal member 30 and the negative electrode terminal member 40 are collectively referred to as “terminal members 30, 40”.

(Configuration of case 10)
The housing 10 has a battery case 12 and a lid 14. The battery case 12 is a substantially rectangular container having an opening on the top surface, and is formed of, for example, a synthetic resin. The lid 14 is a member disposed so as to close the opening of the battery case 12 and is made of, for example, a synthetic resin. By bonding the peripheral portion of the lower surface of the lid 14 and the peripheral portion of the opening of the battery case 12 by, for example, heat welding, a space in which the air tightness with the outside is maintained is formed in the housing 10.

  An exhaust plug 15 is disposed on the lid 14. The exhaust plug 15 has a function of collectively exhausting the exhaust gas from an internal pressure adjusting rubber valve (not shown) provided in each cell and discharging it to the outside of the lead storage battery 100.

  The space in the housing 10 is divided into a plurality of (six in the present embodiment) cell chambers 16 aligned in a predetermined direction (the X-axis direction in the present embodiment) by a plurality of (five in the present embodiment) partition walls 58. It is divided. Hereinafter, the direction (X-axis direction) in which the plurality of cell chambers 16 are arranged is referred to as “cell alignment direction”. One electrode plate group 20 is accommodated in each cell chamber 16 in the housing 10. In the present embodiment, since the space in the housing 10 is divided into six cell chambers 16, the lead storage battery 100 is provided with six electrode plate groups 20.

(Configuration of electrode group 20)
As shown in FIGS. 4 to 6, the electrode plate group 20 includes a plurality of positive electrode plates 210, a plurality of negative electrode plates 220, and a separator 230. The plurality of positive electrode plates 210 and the plurality of negative electrode plates 220 are arranged such that the positive electrode plates 210 and the negative electrode plates 220 are alternately arranged. The separator 230 is disposed between the positive electrode plate 210 and the negative electrode plate 220 adjacent to each other, and is sandwiched between the positive electrode plate 210 and the negative electrode plate 220. The electrode plate group 20 may include other members (for example, a non-woven sheet disposed between the positive electrode plate 210 and the negative electrode plate 220) other than the positive electrode plate 210, the negative electrode plate 220, and the separator 230. Hereinafter, the positive electrode plate 210 and the negative electrode plate 220 will be collectively referred to as “electrode plates 210 and 220”.

  The positive electrode plate 210 includes a positive electrode current collector 212 and a positive electrode active material 216 supported by the positive electrode current collector 212. The positive electrode current collector 212 is a conductive member having bones arranged in a substantially lattice shape or a mesh shape, and is formed of, for example, lead or a lead alloy. Further, the positive electrode current collector 212 has a positive electrode ear 214 projecting upward in the vicinity of the upper end thereof. The positive electrode active material 216 contains lead dioxide. The positive electrode active material 216 may further contain other known additives. In the positive electrode plate 210 having such a configuration, for example, the positive electrode current collector 212 is coated or filled with a positive electrode active material paste mainly composed of lead monoxide, water and dilute sulfuric acid, and the positive electrode active material paste is dried. It can be produced by performing known chemical conversion treatment after the treatment. The positive electrode active material 216 in the present embodiment is obtained by removing the positive electrode current collector 212 from the positive electrode plate 210, and corresponds to the positive electrode material in the claims.

  The negative electrode plate 220 has a negative electrode current collector 222 and a negative electrode active material 226 supported by the negative electrode current collector 222. The negative electrode current collector 222 is a conductive member having bones arranged in a substantially lattice shape or a mesh shape, and is made of, for example, lead or a lead alloy. In addition, the negative electrode current collector 222 has a negative electrode ear 224 protruding upward in the vicinity of the upper end thereof. The negative electrode active material 226 contains lead (cavernous lead). The negative electrode active material 226 may further contain other known additives (eg, fiber, carbon, lignin, barium sulfate, etc.). In the negative electrode plate 220 having such a configuration, for example, after applying or filling a negative electrode active material paste containing lead to the negative electrode current collector 222 and drying the negative electrode active material paste, known conversion treatment is performed. Can be produced by

  The separator 230 is made of an insulating material (for example, glass fiber or synthetic resin), and is a mat-like member that can be elastically deformed in the thickness direction. The separator 230 is impregnated with an electrolytic solution (for example, dilute sulfuric acid). Thus, the separator 230 has a function to prevent the short circuit between the bipolar plates 210 and 220 and to retain the electrolytic solution. In the state where the electrode plate group 20 is accommodated in the cell chamber 16, the electrode plate group 20 receives a compressive force in the thickness direction (in the present embodiment, in the X-axis direction). Therefore, the respective electrode plates 210 and 220 constituting the electrode group 20 are in a state of being in good contact with the separator 230 holding the electrolytic solution.

  As shown in FIGS. 3 to 5, the positive electrode ear portions 214 of the plurality of positive electrode plates 210 constituting the electrode plate group 20 are connected to a positive electrode side strap 52 formed of, for example, lead or a lead alloy. That is, the plurality of positive electrode plates 210 are electrically connected in parallel via the positive electrode side strap 52. Similarly, the negative electrode ear portions 224 of the plurality of negative electrode plates 220 constituting the electrode plate group 20 are connected to the negative electrode side strap 54 formed of, for example, lead or a lead alloy. That is, the plurality of negative electrode plates 220 are electrically connected in parallel via the negative electrode side strap 54. Hereinafter, the positive side strap 52 and the negative side strap 54 are collectively referred to as "straps 52, 54".

  In the lead storage battery 100, the negative electrode side strap 54 accommodated in one cell chamber 16 is connected to one side of the one cell chamber 16 (for example, X axis negative) through a connection member 56 formed of, for example, lead or lead alloy. It connects to the positive electrode side strap 52 accommodated in the other cell chamber 16 adjacent to direction direction). Further, the positive side strap 52 accommodated in the one cell chamber 16 is connected to the other cell chamber 16 adjacent to the other side (for example, the X-axis positive direction side) of the one cell chamber 16 via the connection member 56. Are connected to the negative side strap 54 housed in FIG. That is, the plurality of electrode plate groups 20 included in the lead storage battery 100 are electrically connected in series via the straps 52 and 54 and the connection member 56. As shown in FIG. 4, the positive side strap 52 accommodated in the cell chamber 16 positioned at one end (the positive side in the X-axis direction) in the cell alignment direction is not the connection member 56 but a positive pole post described later. Connected to 34. Further, as shown in FIG. 5, the negative side strap 54 accommodated in the cell chamber 16 positioned at the other end (the negative side of the X axis) in the cell alignment direction is not the connection member 56 but a negative pole post described later. Connected to the 44.

(Configuration of terminal members 30, 40)
As shown in FIGS. 1 and 2, the positive electrode terminal member 30 is disposed in the vicinity of the end of one side (the positive side in the X-axis direction) of the housing 10 in the cell alignment direction, and the negative electrode terminal member 40 is It is arranged near the end of the other side (X-axis negative direction side) in the cell alignment direction in the housing 10.

  As shown in FIG. 4, the positive electrode terminal member 30 includes a positive electrode bushing 32, a positive electrode post 34, and a positive electrode terminal portion 36. The positive electrode side bushing 32 is a substantially cylindrical conductive member in which a hole penetrating in the vertical direction is formed, and is formed of, for example, a lead alloy. The positive electrode side bushing 32 is embedded in the lid 14 by insert molding. The positive electrode post 34 is a substantially cylindrical conductive member, and is formed of, for example, a lead alloy. The positive electrode column 34 is inserted into the hole of the positive electrode side bushing 32 and is joined to the positive electrode side bushing 32 by welding, for example. The lower end portion of the positive electrode column 34 protrudes downward from the lower end portion of the positive electrode bushing 32, and further protrudes downward from the lower surface of the lid 14, and as described above, one side in the cell alignment direction (X-axis positive direction side It is connected to the positive side strap 52 accommodated in the cell chamber 16 located at the end of. The positive electrode side terminal portion 36 is, for example, a substantially L-shaped conductive member, and is formed of, for example, a lead alloy. The upper end portion of the positive electrode terminal portion 36 protrudes upward from the upper surface of the lid 14, and the lower end portion of the positive electrode terminal portion 36 is electrically connected to the upper end portion of the positive electrode post 34. The periphery of the portion of the top surface of the lid 14 through which the positive electrode terminal portion 36 penetrates is sealed by, for example, a resin member 90. The positive electrode side terminal portion 36 and the positive electrode post 34 may be an integral member.

  As shown in FIG. 5, the negative electrode terminal member 40 includes a negative electrode bushing 42, a negative electrode post 44, and a negative electrode terminal portion 46. The negative electrode side bushing 42 is a substantially cylindrical conductive member in which a hole penetrating in the vertical direction is formed, and is formed of, for example, a lead alloy. The negative electrode side bushing 42 is embedded in the lid 14 by insert molding. The negative electrode post 44 is a substantially cylindrical conductive member, and is formed of, for example, a lead alloy. The negative electrode post 44 is inserted into the hole of the negative electrode side bushing 42 and is joined to the negative electrode side bushing 42 by welding, for example. The lower end portion of the negative electrode post 44 protrudes downward from the lower end portion of the negative electrode side bushing 42, and further protrudes downward from the lower surface of the lid 14, and as described above, the other side in the cell alignment direction Is connected to the negative side strap 54 housed in the cell chamber 16 located at the end of. The negative electrode side terminal portion 46 is, for example, a substantially L-shaped conductive member, and is formed of, for example, a lead alloy. The upper end portion of the negative electrode terminal portion 46 protrudes upward from the upper surface of the lid 14, and the lower end portion of the negative electrode terminal portion 46 is electrically connected to the upper end portion of the negative electrode post 44. The periphery of a portion of the top surface of the lid 14 through which the negative electrode terminal portion 46 penetrates is sealed by, for example, a resin member 90. Note that the negative electrode side terminal portion 46 and the negative electrode post 44 may be an integral member.

  When the lead storage battery 100 is discharged, a load (not shown) is connected to the positive electrode terminal portion 36 of the positive electrode terminal member 30 and the negative electrode terminal portion 46 of the negative electrode terminal member 40. Electric power generated by the reaction at the positive electrode plate 210 (the reaction of lead dioxide to lead sulfate) and the reaction at the negative electrode plate 220 (the reaction of lead sulfate to lead sulfate) is supplied to the load. Further, when the lead storage battery 100 is charged, a power supply (not shown) is connected to the positive electrode terminal portion 36 of the positive electrode terminal member 30 and the negative electrode terminal portion 46 of the negative electrode terminal member 40 and supplied from the power supply. The generated electric power causes a reaction (a reaction of lead sulfate to lead dioxide) at each positive electrode plate 210 of each electrode plate group 20 and a reaction at a negative electrode plate 220 (a reaction of lead sulfate to lead (cavernous lead)). The lead storage battery 100 is charged.

A-2. Detailed Configuration of Positive Electrode Current Collector 212:
Next, the detailed configuration of the positive electrode current collector 212 constituting the positive electrode plate 210 will be described. 7 is an explanatory view showing a YZ plane configuration of the positive electrode current collector 212, and FIG. 8 is an explanatory view showing an XY cross-sectional configuration of the positive electrode current collector 212 at the position of VIII-VIII in FIG. 9 is an explanatory view showing an XZ cross-sectional configuration of the positive electrode current collector 212 at the position of IX-IX in FIG. 7. In the following description, the Z-axis direction is also referred to as "longitudinal direction", the Y-axis direction is also referred to as "horizontal direction", and the X-axis direction is also referred to as "depth direction". The X-axis direction (depth direction) corresponds to the first direction in the claims.

  As shown in FIG. 7, the positive electrode current collector 212 has a frame portion 60, an inner portion 70, and the above-described ear portion 214. In the present embodiment, the positive electrode current collector 212 further has a foot 80 provided on the lower side of the frame 60.

  The frame portion 60 is composed of four frame bones 61 and 62, and has a substantially rectangular shape (a substantially rectangular shape in the present embodiment) when viewed in the X-axis direction (the depth direction). The thickness T0 of the frame 60 in the X-axis direction (depth direction) is preferably 4.0 mm or more. In the following description, among the four frame bones constituting the frame portion 60, a pair of frame bones parallel to the Y-axis direction (lateral direction) is referred to as "horizontal frame bone 61", and the Z-axis direction (longitudinal direction) A pair of frame bones parallel to each other is called a "vertical frame bone 62". Further, of the pair of lateral frame bones 61, the lateral frame bone 61 located on the upper side (Z-axis positive direction side) is referred to as "upper-side lateral frame bone 61t" and is located on the lower side (Z-axis negative direction side) The frame 61 is referred to as "lower lateral frame 61b". Further, of the pair of vertical frame bones 62, the vertical frame bone 62 located on the Y axis negative direction side is called "left vertical frame bone 62l", and the vertical frame bone 62 located on the Y axis positive direction side is It is called a frame 62r.

  The ears 214 are provided to extend upward from the upper lateral frame 61t. The upper lateral frame 61t corresponds to the first frame in the claims.

  The inner portion 70 is provided inside the frame 60 and has a plurality of inner bones 710 and 720. More specifically, the inner portion 70 has a plurality of first inner bones connecting between two frame bones (i.e., left vertical frame bone 621 and right vertical frame bone 62r) connected to the upper lateral frame bone 61t. Having a first internal bone group 71 comprised of 710; In the present embodiment, the number N1 of the first inner bones 710 is 14, and the extension direction of each first inner bone 710 is parallel to the Y-axis direction (lateral direction). Are arranged substantially uniformly in the Z-axis direction (longitudinal direction). In the following description, the first inner bone 710 is also referred to as “lateral inner bone 710”, and the first inner bone group 71 is also referred to as “horizontal inner bone group 71”.

  The inner portion 70 further has a plurality of second inner bones 720 connecting between the upper lateral frame 61 t and one frame opposite to the upper lateral frame 61 t (that is, the lower lateral frame 61 b). And a second inner bone group 72. In the present embodiment, the number N2 of the second inner bones 720 is seven, and the extension direction of the second inner bones 720 is parallel to the Z-axis direction (longitudinal direction). Are arranged substantially uniformly in the Y-axis direction (lateral direction). In the following description, the second inner bone 720 is also referred to as “longitudinal inner bone 720”, and the second inner bone group 72 is also referred to as “longitudinal inner bone group 72”.

  Thus, the inner portion 70 has a plurality of lateral inner bones 710 that constitute the lateral inner bones 71 and a plurality of longitudinal inner bones 720 that constitute the longitudinal inner bones 72. Each transverse inner bone 710 is connected to each longitudinal inner bone 720 at the intersection with each longitudinal inner bone 720. Therefore, the shape of the inner portion 70 in the X-axis direction (depth direction) is substantially lattice-like (knit-like). In addition, although the inner part 70 is further extended to other inner bones (for example, from the upper side horizontal frame bone 61t to the lower side horizontal frame bone 61b, it does not reach the lower side horizontal frame bone 61b, but the inner bone or And the inner bone in the diagonal direction connecting the lower horizontal frame 61b and the left vertical frame 621).

As shown in FIGS. 7 and 8, in the present embodiment, the longitudinally inner bone group 72 includes an inner bone 720a. Here, the inner bone 720a is an inner bone in which the cross-sectional area S2 of the cross section orthogonal to the extending direction satisfies the relationship of the following formula (1). That is, in the inner bone 720a, the ratio (= S2 / T0 ² ) of the cross-sectional area S2 of the inner inner bone 720 to the area (= T0 ² ) of the virtual square VS whose side is the thickness T0 of the frame 60 (Hereinafter referred to as “longitudinal bone section coefficient K2”) is a longitudinally inner bone 720 having a value of 0.35 or more and 0.65 or less. The inner bone 720a has a relatively large cross-sectional area S2 (though the longitudinal bone cross-sectional coefficient K2 is 0.35 or more), but the cross-sectional area S2 is not excessively large (the longitudinal bone cross-sectional coefficient K2 is 0.65 or less) Can be said to be the longitudinal inner bone 720. Incidentally, the cross-sectional area S2 of Futoshinai bone 720a, for example, 10.6 mm ² or more, it is preferable that the 19.7 mm ² or less.
0.35 × T0 ² ≦ S 2 ≦ 0.65 × T 0 ² (1)
(However, T0 is the thickness of the frame 60 in the X-axis direction (depth direction))

  In the present embodiment, a ratio (= n2 / N2) of the number n2 of the inner bone 720a to the number N2 of the vertical inner bones 720 constituting the vertical inner bone group 72 (hereinafter referred to as “the inner bone ratio R2”) is , Has become more than 0.7. For example, in the example shown in FIG. 7, all of the seven longitudinal inner bones 720 constituting the longitudinal inner bone group 72 are the inner bone 720a (that is, N2 = 7, n2 = 7), Inner bone ratio R2 is 1.0.

  In the present embodiment, as shown in FIG. 8, the X axis direction and the extension direction of the inner bone 720a with respect to the thickness T2 in the X axis direction (the depth direction) of the inner bone 720a (ie, the Z axis direction The ratio (= W 2 / T 2) of the width W 2 in the direction (that is, the Y-axis direction) orthogonal to both of them) is 0.9 or more and 1.1 or less. That is, the shape of the cross section orthogonal to the extension direction of the inner bone 720a is relatively close to a circular shape.

Further, as shown in FIGS. 7 and 9, in the present embodiment, the lateral inner bone group 71 includes the endosteal bone 710a. The fine inner bone 710a is an inner bone in which the cross-sectional area S1 of the cross section orthogonal to the drawing direction satisfies the relationship of the following formula (2). That is, in the inner bone 710a, the ratio of the cross sectional area S1 of the lateral inner bone 710 to the maximum value S2max of the cross sectional area S2 of the inner bone 720a (= S1 / S2max) (hereinafter referred to as "lateral bone cross sectional coefficient K1") is It is a lateral inner bone 710 internal bone which is 0.077 or more (ie, 1/13 or more) and 0.125 or less (ie, 1/8 or less). In the inner bone 710a, although the cross-sectional area S1 is relatively small (though the cross-sectional coefficient K1 is 0.125 or less), the cross-sectional area S1 is not excessively small (the cross-sectional coefficient K1 is 0.077 or more) Can be said to be the lateral inner bone 710. The cross-sectional area S1 of the inner bone 710a is preferably, for example, 1.2 mm ² or more and 2.0 mm ² or less.
0.077 × S2max ≦ S1 ≦ 0.125 × S2max (2)
(However, S2max is the maximum value of the cross-sectional area S2 of the inner bone 720a)

  In the present embodiment, the ratio (= n1 / N1) of the number n1 of the inner bones 710a to the number N1 of the horizontal inner bones 710 constituting the horizontal inner bone group 71 (hereinafter referred to as “inner bone ratio R1”) is 0 .7 or more. For example, in the example shown in FIG. 7, 12 lateral inner bones 710 of the 14 lateral inner bones 710 constituting the lateral inner bone group 71 are the inner bones 710a (ie, N1 = 14, n1 = 12) Therefore, the endotracheal bone rate R1 is 0.86.

A-3. Effects of the present embodiment:
As described above, the lead storage battery 100 of the present embodiment includes the positive electrode plate 210 including the positive electrode current collector 212 and the positive electrode active material 216 supported by the positive electrode current collector 212. The positive electrode current collector 212 is composed of four frame bones 61 and 62 including the upper lateral frame bone 61t, and an ear provided on the substantially rectangular frame 60 in the X-axis direction and the upper lateral frame bone 61t. 214 and an inner portion 70 provided inside the frame 60. The inner portion 70 is a lateral internal bone group 71 composed of N1 lateral internal bones 710 connecting between two frame bones (left longitudinal frame bone 62l and right longitudinal frame bone 62r) connected to the upper lateral frame bone 61t. And a longitudinal inner bone group 72 composed of N longitudinal inner bones 720 connecting between the upper lateral frame 61 t and one frame (the lower lateral frame 61 b) opposed to the upper lateral frame 61 t And. In the longitudinally inner bone group 72, the cross-sectional area S2 of the cross section orthogonal to the drawing direction satisfies the relationship of 0.35 × T0 ² ≦ S 2 ≦ 0.65 × T 0 ² (where T 0 is the thickness of the frame portion 60) It includes n2 inner bones 720a. In the lateral inner bone group 71, the cross-sectional area S1 of the cross section orthogonal to the drawing direction is in the relationship of 0.077 × S2max ≦ S1 ≦ 0.125 × S2max (where S2max is the maximum value of the cross-sectional area of the inner bone). It contains n 1 subendothelial bones 710 a to be filled. The ratio (n2 / N2) of the number n2 of the inner bones 720a to the number N2 of the vertical inner bones 720 constituting the inner-end bones group 72 is 0.7 or more. The ratio (n1 / N1) of the number n1 of the endotracheal bone 710a to the number N1 of the lateral inner bones 710 constituting the lateral inner bone group 71 is 0.7 or more.

As described above, in the lead-acid battery 100 according to the present embodiment, a relatively high ratio (70%) of the N2 longitudinal inner bones 720 which are inner bones in a direction toward the upper horizontal frame bone 61t provided with the ear portion 214 The longitudinal inner bone 720 is the inner bone 720a having a large cross-sectional area S2 (where S2 ≧ 0.35 × T0 ² ) without causing a decrease in castability. Therefore, even if lead storage battery 100 is used for a long time and corrosion of inner bones 710 and 720 progresses, longitudinal inner bone 720 which is an inner bone in a direction toward upper lateral frame bone 61t provided with ear portions 214 is cut. As a result, the decrease in capacity can be suppressed, and the life characteristics can be improved.

  Further, in the lead storage battery 100 of the present embodiment, due to the presence of the inner bone 720a, there is a concern that the weight of the positive electrode current collector 212 may increase, and in turn, the weight of the lead storage battery 100 may increase. However, the inner bone connecting between the two frame bones (the left vertical frame bone 621 and the right vertical frame bone 62r) connected to the upper lateral frame bone 61t (that is, the inner bone having a small influence on the volume even if it is cut) ) Of the N1 lateral internal bones 710, a relatively high proportion (70% or more) of the lateral internal bones 710 has a small cross-sectional area S1 within a range not accompanied by a decrease in the castability and the fillability of the active material (0. 077 × S2max ≦ S1 ≦ 0.125 × S2max)). Therefore, the influence of the increase in weight of the positive electrode current collector 212 due to the presence of the inner bone 720a can be compensated by the presence of the inner bone 710a, and the increase in weight of the positive electrode current collector 212 as a whole can be suppressed. The increase in weight of the lead storage battery 100 can be suppressed. Therefore, according to the lead storage battery 100 of the present embodiment, it is possible to improve the life characteristics of the lead storage battery 100 while avoiding the deterioration of the other characteristics (weight characteristics, filling property, castability) of the lead storage battery 100.

  Further, in the lead storage battery 100 of the present embodiment, the X-axis direction and the extension direction of the inner bone 720a (that is, the Z-axis direction) with respect to the thickness T2 of the inner bone 720a in the X axis direction (depth direction). The ratio (= W2 / T2) of the width W2 in the direction orthogonal to both (that is, the Y-axis direction) is 0.9 or more and 1.1 or less. According to the lead storage battery 100 of the present embodiment, the shape of the cross section orthogonal to the extension direction of the inner bone 720a can be made close to an ideal circular shape in terms of cutting prevention, and the inner bone 720a is corroded Can be effectively suppressed, and the life characteristics of the lead storage battery 100 can be effectively improved. When the ratio (= W2 / T2) of width W2 to thickness T2 of inner bone 720a is 0.9 or more and 1.1 or less, the cross-sectional area S2 of inner bone 720a tends to increase, and as a result, the positive electrode The weight of the current collector 212 tends to increase. However, in the lead-acid battery 100 according to the present embodiment, since the relatively large proportion (70% or more) of the lateral inner bone 710 is used as the inner bone 710a, the increase in weight of the positive electrode current collector 212 as a whole is suppressed. The cross-sectional shape of the inner bone 720a can be made an ideal shape (a shape with a W2 / T2 of 0.9 or more and 1.1 or less) in terms of corrosion prevention, and the life characteristics of the lead-acid battery 100 are effective Can be improved.

A-4. Performance evaluation:
A plurality of samples of lead acid storage batteries (SA1 to SA14 corresponding to the example and SA21 to SA26 corresponding to the comparative example) were produced, and performance evaluation was performed on the samples. 10 to 13 are explanatory diagrams showing the performance evaluation results. In addition, about sample SA1 used as the reference | standard of several samples, it describes in common to all the FIGS. 10-13 (In each figure, it shows in a bold frame and shows).

A-4-1. For each sample:
In each sample, the lateral inner bone group 71 of the positive electrode current collector 212 is composed of one or two different lateral internal bones 710 having different cross-sectional areas, and the longitudinal inner bone group 72 of the positive electrode current collector 212 is , Or two different longitudinal inner bones 720 of different cross-sectional areas. FIGS. 10 to 13 show the maximum value (hereinafter referred to as “maximum longitudinal bone cross-sectional coefficient K2max”) of the above-mentioned longitudinal bone cross-sectional coefficient K2 (= S2 / T0 ² ) of each longitudinal inner bone 720 for each sample. It is done. When the longitudinally inner bone group 72 is composed of one type of longitudinally inner bone 720, the longitudinal bone cross-sectional coefficient K2 of the longitudinal inner bone 720 is the maximum longitudinal bone cross-sectional coefficient K2max, and two types of longitudinally inner bone group 72 are used. In the case of being composed of the longitudinal inner bone 720, the longitudinal bone cross-sectional coefficient K2 of the longitudinal inner bone 720 with the larger cross-sectional area S2 becomes the maximum longitudinal bone cross-sectional coefficient K2max. In this performance evaluation, T0 = 5.5 mm.

  Similarly, in FIGS. 10 to 13, for each sample, the minimum value (hereinafter referred to as “minimum cross bone cross section coefficient K1 min”) of the above-described cross bone cross section coefficient K1 (= S1 / S2 max) of each horizontal inner bone 710 is obtained. It is shown. When the lateral inner bone group 71 is composed of one kind of lateral inner bone 710, the lateral bone cross sectional coefficient K1 of the lateral inner bone 710 is the minimum lateral bone cross sectional coefficient K1 min, and the lateral inner bone group 71 is two lateral lateral bone 710 In this case, the cross sectional coefficient K1 of the lateral inner bone 710 having the smaller cross-sectional area S1 is the minimum cross sectional coefficient K1 min.

  Moreover, in-each-bone ratio R2 is shown about each sample by FIGS. 10-13. However, the inner bone ratio R2 shown in FIGS. 10 to 13 is the ratio of the number of longitudinal inner bones 720 taking the maximum longitudinal bone cross-sectional coefficient K2max to the number of longitudinal inner bones 720. In the case where the maximum longitudinal bone cross-sectional coefficient K2max falls within the range (that is, 0.35 or more, 0.65 or less) satisfying the equation (1) described in the above embodiment, the maximum longitudinal bone cross-sectional coefficient K2max is taken. Since the longitudinally inner bone 720 corresponds to the inner bone 720a, the inner bone ratio R2 shown in FIGS. 10 to 13 has the same meaning as the inner bone ratio R2 described in the above-described embodiment. On the other hand, when the maximum longitudinal bone cross-sectional coefficient K2max is outside the above range (0.35 or more and 0.65 or less), the longitudinal inner bone 720 having the maximum longitudinal bone cross-sectional coefficient K2max does not correspond to the inner bone 720a Therefore, the intra-articular bone rate R2 shown in FIG. 10 to FIG. 13 does not mean the same as the intra-internal bone rate R2 described in the embodiment described above, but the same word is used here for convenience. However, in this case, the numerical values in the inner bone ratio R2 column in FIGS. 10 to 13 are shown in parentheses. In the performance evaluation, the number of longitudinal inner bones 720 was seven.

  Likewise, in FIGS. 10 to 13, the intraosseous bone rate R1 is shown for each sample. However, the intraosseous bone rate R1 shown in FIGS. 10 to 13 is a ratio of the number of lateral inner bones 710 taking the minimum transverse bone cross-sectional coefficient K1 min to the number of lateral inner bones 710. When the minimum transverse bone modulus K1 min is in the range satisfying the equation (2) described in the above embodiment (that is, 0.077 or more and 0.125 or less), the minimum transverse bone modulus K1 min is taken. Since the lateral bone 710 corresponds to the endotracheal bone 710a, the intraosseous bone rate R1 shown in FIGS. 10 to 13 has the same meaning as the intraosseous bone rate R1 described in the above-described embodiment. On the other hand, when the minimum transverse bone section coefficient K1min is outside the above range (0.077 or more and 0.125 or less), the lateral inner bone 710 taking the minimum transverse bone section coefficient K1min does not correspond to the subinner bone 710a. 10 to 13 do not mean the same as the intraosseous bone rate R1 described in the above-described embodiment, but the same word is used here for convenience. However, in this case, the numerical values of the intraosseous bone rate R1 column in FIGS. 10 to 13 are shown in parentheses. In the present performance evaluation, the number of lateral inner bones 710 was 14.

  Each sample shown in FIG. 10 differs from the reference sample SA1 only in the maximum longitudinal bone cross-sectional coefficient K2max. Further, each sample shown in FIG. 11 is different from the reference sample SA1 only in the inner bone ratio R2. Further, each sample shown in FIG. 12 differs from the reference sample SA1 only in the minimum transverse bone cross-sectional coefficient K1 min. Further, each sample shown in FIG. 13 is different from the reference sample SA1 only in the intraosseous bone rate R1.

A-4-2. Evaluation items and evaluation methods:
In this performance evaluation, evaluations were made on four items of life, weight, fillability of the active material, and castability of the current collector, using each of the samples described above.

The evaluation of the life was performed as follows according to the overcharge life test method of JIS. That is, each sample of the fully charged lead-acid battery is continuously overcharged at a current of 0.2 × I ₁₀ (0.02 C ₁₀ A). During the overcharge life test, perform an hourly capacity test every 30 days to confirm the capacity. The test is ended when the volume is less than 80%, and the elapsed days at that point is taken as the life. The life (hereinafter referred to as “the lead storage battery having a configuration in which the thickness T 0 of the frame portion 60 in the X-axis direction (depth direction) is less than 4.0 mm) having the measured life is a conventional configuration. When it is 1.5 times or more of “conventional life”, it is judged as “excellent” (◎), and when it is 1.3 times or more and less than 1.5 times the conventional life, “good” (〇 When it was determined that the life was less than 1.3 times the conventional life, it was determined as "defect" (x).

  Moreover, weight evaluation was performed as follows. That is, when the weight of each sample is measured and the measured weight is less than 1.5 times the weight of the above-described lead storage battery of the conventional configuration (hereinafter referred to as “conventional weight”), “excellent” (◎ If the weight is 1.5 times or more and less than 1.8 times the conventional weight, it is judged as "good" (o) and if it is 1.8 times or more the conventional weight, "bad" It was judged as (x).

  Moreover, evaluation of the filling property was performed as follows. That is, the positive electrode current collector 212 is filled with the active material paste, and the pieces are dropped (after the filling of the active material paste, the active material paste before entering the preheating drying furnace is in a relatively soft state). If the phenomenon that part of the paste for the active material in the body 212 falls off completely occurs, or if the back circumference (the phenomenon that the inner bone is exposed by 10% or more) occurs, the result is poor If the incidence rate of is less than 0.2%, it is judged as "excellent" (◎), and if it is 0.2% or more and less than 0.3%, it is judged as "good" (〇). When it was 0.3% or more, it was determined as "defective" (x).

  Moreover, evaluation of castability was performed as follows. That is, the positive electrode current collector 212 is manufactured by casting, and a cavity (a phenomenon in which a cavity is generated inside), a burn break (a phenomenon in which a bone becomes brittle and a break or a crack occurs) and a crosspiece (a bone becomes too thin If at least one of the phenomenon (cut off in the middle) occurs is considered to be a finish defect, and if the occurrence rate of a finish defect is less than 0.2%, it is judged as "excellent" (◎), 0.2% or more When it was less than 0.3%, it was judged as "good" (〇), and when it was 0.3% or more, it was judged as "defect" (x).

A-4-3. Evaluation results:
First, each sample (SA1 to SA3, SA21, and SA22) illustrated in FIG. 10 will be described. Of these samples, in the samples SA1 to SA3, while any evaluation item is determined to be "good" (O) or more, in the sample SA22, the evaluation item of "life" is determined to be "defect" (x) In the sample SA21, the evaluation items of “weight” and “castability” were determined to be “defective” (×).

  With respect to the lateral inner bone group 71, the conditions are the same for all the samples shown in FIG. That is, in all the samples, the minimum transverse bone modulus K1min is within the range satisfying the equation (2) described in the above embodiment (ie, 0.077 or more and 0.125 or less). The lateral inner bone 710 having the cross-sectional coefficient K1min corresponds to the endotracheal bone 710a. In addition, the intraosseous bone rate R1 is in the range (that is, 0.7 or more) described in the above-described embodiment.

  On the other hand, regarding the longitudinally inner bone group 72, the conditions are different for each sample shown in FIG. Specifically, in the sample SA22, the value (0. 0.) is lower than the range (ie, 0.35 or more, 0.65 or less) in which the maximum longitudinal bone cross-sectional coefficient K2max satisfies the equation (1) described in the above-described embodiment. Since the cross-sectional area S2 of the longitudinal inner bone 720 which takes the maximum longitudinal bone cross-sectional coefficient K2max is small, the longitudinal inner bone 720 does not correspond to the inner bone 720a. Therefore, in the sample SA22, since the cross-sectional area S2 of the longitudinal inner bone 720 constituting the longitudinal inner bone group 72 is relatively small as a whole, the capacity is reduced due to corrosion and cutting of the longitudinal inner bone 720. It can be considered that the "lifetime" evaluation has become low because of insufficient suppression.

  Further, in the sample SA21, the value (0.70) is higher than the range (that is, 0.35 or more and 0.65 or less) in which the maximum longitudinal bone cross-sectional coefficient K2max satisfies the equation (1) described in the above embodiment. Since the cross-sectional area S2 of the longitudinal inner bone 720 having the maximum longitudinal bone cross-sectional coefficient K2max is excessively large, the longitudinal inner bone 720 does not correspond to the inner bone 720a. Therefore, in the sample SA21, since the cross-sectional area S2 of the longitudinal inner bone 720 constituting the longitudinal inner bone group 72 is excessively large overall, the weight of the longitudinal inner bone group 72 excessively increases and the "weight" evaluation is low. As a result, it is considered that the “castability” evaluation is lowered due to the tendency of occurrence of cavities and burns.

  On the other hand, in the samples SA1 to SA3, the maximum longitudinal bone cross-sectional coefficient K2max is within the range satisfying the equation (1) described in the above embodiment (that is, 0.35 or more and 0.65 or less). The longitudinally inner bone 720 having the bone cross-sectional coefficient K2max corresponds to the inner bone 720a having a relatively large cross-sectional area S2 but not excessively large. Therefore, in the samples SA1 to SA3, it is possible to suppress a decrease in volume caused by corrosion and cutting of the longitudinal inner bone 720 constituting the longitudinal inner bone group 72, and the “life” evaluation becomes high, It is possible to suppress an increase in the weight of the longitudinally inner bone group 72, to increase the "weight" evaluation, and to suppress the occurrence of the void and burn and to increase the "castability" evaluation. it is conceivable that.

  Next, each sample (SA1, SA4 to SA6, SA23) shown in FIG. 11 will be described. Of these samples, in samples SA1 and SA4 to SA6, all evaluation items were judged as “good” (以上) or more, while in sample SA23, “defect” (×) for evaluation items of “life” It was judged that.

  As for the lateral inner bone group 71, the conditions are the same for all the samples shown in FIG. That is, in all the samples, the minimum transverse bone modulus K1min is within the range satisfying the equation (2) described in the above embodiment (ie, 0.077 or more and 0.125 or less). The lateral inner bone 710 having the cross-sectional coefficient K1min corresponds to the endotracheal bone 710a. In addition, the intraosseous bone rate R1 is in the range (that is, 0.7 or more) described in the above-described embodiment.

  On the other hand, regarding the longitudinally inner bone group 72, the conditions are different for each sample shown in FIG. Specifically, in the sample SA23, the maximum longitudinal bone cross-sectional coefficient K2max is within the range (that is, 0.35 or more, 0.65 or less) satisfying the equation (1) described in the above-described embodiment. The longitudinally inner bone 720 having the longitudinal bone cross-sectional coefficient K2max corresponds to the inner bone 720a having a relatively large cross-sectional area S2 but not excessively large. However, in the sample SA23, the inner bone ratio R2 is a value (0.6) lower than the range (i.e., 0.7 or more) described in the above-described embodiment. Therefore, in the sample SA23, the number of longitudinal inner bones 720 corresponding to the inner bones 720a among the longitudinal inner bones 720 constituting the longitudinal inner bones 72 is small, so the longitudinal inner bones 720 are corroded and cut off It is thought that the "lifetime" evaluation has become low due to the fact that the reduction in capacity resulting from this can not be sufficiently suppressed.

  On the other hand, in samples SA1 and SA4 to SA6, the inner bone ratio R2 is within the range (that is, 0.7 or more) described in the above-described embodiment. Therefore, in the samples SA1 and SA4 to SA6, among the longitudinal inner bones 720 constituting the longitudinal inner bone group 72, the number of longitudinal inner bones 720 corresponding to the inner inner bone 720a increases, and the longitudinal inner bone group 72 is configured. It is considered that the reduction of the volume due to the corrosion and cutting of the longitudinal inner bone 720 can be suppressed, and the “life” evaluation is high.

  Next, each sample (SA1, SA7 to SA10, SA24, SA25) shown in FIG. 12 will be described. Of these samples, in the samples SA1 and SA7 to SA10, all evaluation items were determined to be "good" (O) or more, while in the sample SA25, evaluation items of "weight" and "fillability" It was determined as "defective" (x), and in sample SA24, the evaluation items of "fillability" and "castability" were determined as "defective" (x).

  For the longitudinally inner bone group 72, the conditions are the same for all the samples shown in FIG. That is, in all the samples, the maximum longitudinal bone cross-sectional coefficient K2max is in the range satisfying the equation (1) described in the above embodiment (ie, 0.35 or more, 0.65 or less). A longitudinally inner bone 720 having a cross-sectional coefficient K2max corresponds to the inner bone 720a. In addition, the intra-articular bone rate R2 is within the range (that is, 0.7 or more) described in the above-described embodiment.

  On the other hand, regarding the lateral inner bone group 71, the conditions are different for each sample shown in FIG. Specifically, in the sample SA25, the minimum transverse bone cross-sectional coefficient K1min is higher than the range (that is, 0.077 or more and 0.125 or less) satisfying the formula (2) described in the above embodiment (0. Since the cross-sectional area S1 of the lateral inner bone 710 which takes the minimum transverse bone cross-sectional coefficient K1 min is large, the lateral inner bone 710 does not correspond to the endotracheal bone 710a. Therefore, in the sample SA25, since the cross-sectional area S1 of the lateral inner bone 710 constituting the lateral inner bone group 71 is relatively large overall, the weight increase due to the longitudinal inner bone group 72 including the inner bone 720a It is believed that the weight reduction of Group 71 could not be fully compensated and the "weight" rating would be low. Further, in sample SA25, since the cross-sectional area S1 of the lateral inner bone 710 constituting the lateral inner bone group 71 is relatively large as a whole, each cell of the positive electrode current collector 212 becomes excessively small, and the “fillability” evaluation is low. It is considered to have become.

  Further, in the sample SA24, the minimum transverse bone cross-sectional coefficient K1min is a value (0.071) lower than the range (that is, 0.077 or more and 0.125 or less) satisfying the equation (2) described in the above embodiment. Since the cross-sectional area S1 of the lateral inner bone 710 which takes the minimum transverse bone cross-sectional coefficient K1 min is excessively small, the lateral inner bone 710 does not correspond to the endometrioid bone 710a. Therefore, in the sample SA24, since the cross-sectional area S1 of the lateral inner bone 710 constituting the lateral inner bone group 71 is excessively small as a whole, breakage easily occurs and the "castability" evaluation is lowered, and It is thought that the “castability” rating is also lowered due to the influence.

  On the other hand, in the samples SA1 and SA7 to SA10, the minimum transverse bone cross-sectional coefficient K1min is within the range satisfying the equation (2) described in the above embodiment (that is, 0.077 or more and 0.125 or less). The lateral inner bone 710 taking the minimum lateral bone cross-sectional coefficient K1 min corresponds to the subinner bone 710a having a relatively small cross-sectional area S1 but not excessively small. Therefore, in the samples SA1 and SA7 to SA10, the weight increase due to the longitudinal inner bone group 72 including the inner bone 720a could be sufficiently compensated by the weight reduction of the lateral inner bone group 71, so the “weight” evaluation “Coldability” and “fillability” evaluations were high, as it was possible to suppress that the size of each cell of the positive electrode current collector 212 becomes too small, and to suppress the occurrence of crosspieces. Conceivable.

  Next, each sample (SA1, SA11 to SA14, SA26) shown in FIG. 13 will be described. Of these samples, in the samples SA1 and SA11 to SA14, any evaluation item was determined to be "good" (O) or more, while in the sample SA26, "defect" (x) for the evaluation item of "weight" It was judged that.

  For the longitudinally inner bone group 72, the conditions are the same for all the samples shown in FIG. That is, in all the samples, the maximum longitudinal bone cross-sectional coefficient K2max is in the range satisfying the equation (1) described in the above embodiment (ie, 0.35 or more, 0.65 or less). A longitudinally inner bone 720 having a cross-sectional coefficient K2max corresponds to the inner bone 720a. In addition, the intra-articular bone rate R2 is within the range (that is, 0.7 or more) described in the above-described embodiment.

  On the other hand, regarding the lateral inner bone group 71, the conditions are different for each sample shown in FIG. Specifically, in the sample SA26, the minimum transverse bone cross-sectional coefficient K1min is within the range satisfying the equation (2) described in the above-described embodiment (ie, 0.077 or more and 0.125 or less). The lateral inner bone 710 having the lateral bone cross-sectional coefficient K1min corresponds to the subinner bone 710a having a relatively small cross-sectional area S1 but not excessively small. However, in the sample SA26, the intraosseous bone rate R1 is a value (0.6) lower than the range (that is, 0.7 or more) described in the above-described embodiment. Therefore, in the sample SA26, since the number of lateral internal bones 710 corresponding to the endometrial bone 710 among the lateral internal bones 710 constituting the lateral internal bone group 71 is small, the weight due to the longitudinal internal bone group 72 including the internal bone 720a The increase can not be sufficiently compensated by the weight reduction of the lateral inner bone group 71, and it is considered that the "weight" evaluation is lowered.

  On the other hand, in the samples SA1 and SA11 to SA14, the intraosseous bone rate R1 is in the range (that is, 0.7 or more) described in the above-described embodiment. Therefore, in the samples SA1 and SA11 to SA14, the number of lateral internal bones 710 corresponding to the endometrial bone 710a among the lateral internal bones 710 constituting the lateral internal bone group 71 is large, and the longitudinal internal bone group 72 It is considered that the weight increase due to the inclusion can be sufficiently compensated by the weight reduction of the lateral inner bone group 71, and the "weight" evaluation is high.

As described above, according to the present performance evaluation, the longitudinal inner bone group 72 has the longitudinal bone cross sectional coefficient K2 of 0.35 or more and 0.65 or less (that is, the cross sectional area S2 is 0.35 × T0 ² ≦ S2 ≦ 0). includes .65 × satisfies the relationship of T0 ²⁾ Futoshinai bone 720a, Yokouchi Honegun 71, lateral bone section modulus K1 is 0.077 or more and 0.125 or less (i.e., the cross-sectional area S1 is 0.077 The inner diameter of the inner bone which is the ratio of the number of inner radial bones 720a to the number of inner radial bones 720 including the inner radial inner bones 710a including the inner radial bones 710a satisfying the relationship of × S2max ≦ S1 ≦ 0.125 × S2max. If the ratio R2 is 0.7 or more, and the ratio of the number of inner bones 710a to the number of lateral inner bones 710 constituting the horizontal inner bone group 71 is R1 at least 0.7, lead Avoid the decrease in weight characteristics, filling ability and castability of storage batteries One, it was confirmed that it is possible to improve the life characteristics of a lead-acid battery.

In general, in lead acid batteries, “life” of the four evaluation items in this performance evaluation is often regarded as the most important. As shown in FIG. 10, in the samples SA1 and SA2 in which the maximum longitudinal bone cross-sectional coefficient K2max is 0.5 or more and 0.65 or less, the evaluation item of “life” is determined as “excellent” (◎). Longitudinal bone group 72 has a longitudinal bone cross-sectional coefficient K2 of 0.5 or more and 0.65 or less (that is, a cross-sectional area S2 of 0.5 × T0 ² ≦ S 2 ≦ 0.62 × T 0 ² It is possible to further improve the lifespan characteristics by including the inner bone 720a to be satisfied, which is more preferable. In addition, as shown in FIG. 11, in the sample SA1 in which the inner bone ratio R2 is 1.0, the evaluation item of “life” is determined as “excellent” (◎), so the inner bone ratio R2 is When it is 1.0, the life characteristics can be further improved and it can be said to be more preferable.

B. Modification:
The technology disclosed in the present specification is not limited to the above-described embodiment, and can be modified into various forms without departing from the scope of the present invention. For example, the following modifications are also possible.

  The configuration of the lead storage battery 100 in the above embodiment is merely an example, and various modifications are possible. For example, in the above embodiment, the extension directions of the plurality of lateral inner bones 710 constituting the lateral inner bone group 71 are parallel to the Y-axis direction (lateral direction), but at least a part of the plurality of lateral inner bones 710 extends The direction may be a direction different from the Y-axis direction (lateral direction). Similarly, in the above embodiment, although the extension directions of the plurality of longitudinal inner bones 720 constituting the longitudinal inner bone group 72 are parallel to the Z-axis direction (longitudinal direction), at least the plurality of longitudinal inner bones 720 Some stretching directions may be different from the Z-axis direction (longitudinal direction).

  Further, in the above embodiment, the configuration of the positive electrode current collector 212 has been described in detail, but the same configuration as that of the positive electrode current collector 212 described above (the inner and outer bone groups are Including the endotracheal bone group, the ratio of the number of inner bones to the number of longitudinal inner bones constituting the longitudinal inner bone group being at least 0.7, and the number of transverse inner bones constituting the transverse inner bone group A configuration in which the ratio of the number of subendothelial bones to. In this case, the configuration of the positive electrode current collector 212 may be another configuration.

  Moreover, the manufacturing method of the lead storage battery 100 in the said embodiment is an example to the last, and can be variously deformed.

DESCRIPTION OF SYMBOLS 10: Case 12: Battery case 14: Lid 15: Exhaust plug 16: Cell chamber 20: Electrode plate group 30: Positive electrode side terminal member 32: Positive electrode side bushing 34: Positive electrode post 36: Positive electrode side terminal part 40: Negative electrode side terminal Member 42: Negative electrode side bushing 44: Negative electrode post 46: Negative electrode side terminal portion 52: Positive electrode side strap 54: Negative electrode side strap 56: Connection member 58: Partition member 60: Frame portion 61: Horizontal frame bone 61b: Lower horizontal frame bone 61t : Upper lateral frame bone 62: Vertical frame bone 62 l: Left vertical frame bone 62r: Right longitudinal frame bone 70: Inner part 71: Lateral inner bone group 72: Longitudinal inner bone group 80: Foot 90: Resin member 100: Lead storage battery 210 : Positive electrode plate 212: Positive electrode current collector 214: Ear portion 216: Positive electrode active material 220: Negative electrode plate 222: Negative electrode current collector 224: Ear portion 226: Negative electrode active material 230: Separator 710: Horizontal Bone 710a: Hosonai bone 720: vertical within the bone 720a: Futoshinai bone

Claims (2)

Lead storage battery,
An electrode plate having a current collector and an electrode material supported by the current collector,
The current collector is
The frame portion is composed of four frame bones including a first frame bone, and a substantially square frame portion in a first direction view,
An ear provided on the first frame;
An inner portion provided inside the frame portion;
Have
The inner part is
A first inner bone group composed of N1 first inner bones connecting between the two frame bones connected to the first frame bone;
A second inner bone group composed of N2 second inner bones connecting between the first frame bone and the one frame bone opposed to the first frame bone;
Have
The second inner bone group has a cross-sectional area S2 of a cross section orthogonal to the extending direction of 0.35 × T0 ² ≦ S 2 ≦ 0.65 × T 0 ² (where T 0 is the frame portion in the first direction) Containing n2 inner bones that satisfy the relationship
In the first inner bone group, the cross-sectional area S1 of the cross section orthogonal to the extending direction is 0.077 × S2max ≦ S1 ≦ 0.125 × S2max (where S2max is the maximum value of the cross-sectional area of the inner bone) Including n1 submandibular bones that satisfy the relationship
The ratio (n2 / N2) of the number n2 of the inner bones to the number N2 of the second inner bones constituting the second inner bone group is 0.7 or more,
The lead storage battery, wherein a ratio (n1 / N1) of the number n1 of the inner bones to the number N1 of the first inner bones constituting the first inner bone group is 0.7 or more. It is a lead storage battery according to claim 1,
The ratio (W2 / T2) of the width W2 in the direction orthogonal to both the first direction and the extension direction of the inner bone to the thickness T2 in the first direction of the inner bone is 0 Lead-acid battery which is .9 or more and 1.1 or less.

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