CN107086307B - A lead storage battery grid - Google Patents

Abstract

The utility model discloses a lead storage battery grid, which comprises a frame consisting of an upper frame rib, a lower frame rib and two vertical frame ribs, wherein transverse ribs and longitudinal ribs of a reticular structure are formed in the frame in a crisscross manner, and lugs arranged on the upper frame rib, the longitudinal ribs are inclined and folded towards the direction of the lugs, the extension lines of the longitudinal ribs intersect at a point, the intersection point is positioned right above the lugs, and the ratio of the spacing between the upper frame rib and the lower frame rib to the spacing between the intersection point and the lower frame rib is the golden section ratio. The longitudinal ribs of the lead storage battery grid are inclined and folded towards the direction of the lug, the extension lines of the longitudinal ribs intersect at one point, and the internal resistance is minimum; the ratio of the spacing between the upper frame rib and the lower frame rib to the spacing between the intersection point and the lower frame rib is golden section ratio, so that the depth of discharge in unit time is not easy to be too large, and the service life is effectively ensured.

Description

A lead storage battery grid

technical field

The invention relates to the technical field of lead storage battery production, in particular to a lead storage battery grid.

Background technique

It has been 150 years since the creation of lead-acid batteries, and the application fields of batteries are very wide. In recent years, electric vehicles have developed rapidly in my country due to their better mobility performance, lower storage space requirements and excellent price advantages. Thanks to this, the battery industry has also developed rapidly.

Lead-acid battery is a reversible DC power supply, which can convert chemical energy into electrical energy, and also convert electrical energy into chemical energy. The lead-acid battery is mainly composed of electrolyte, tank cover and electrode group. The electrolyte of lead-acid battery is sulfuric acid solution. The electrode group is mainly composed of positive plate, negative plate and separator. The separator mainly serves to store the electrolyte. As a gas channel for oxygen recombination, it plays the role of preventing active material from falling off and short circuit between positive and negative electrodes.

In the process of battery production and processing, the grid is used as the carrier and conductor of the lead paste. The lead paste can only become a plate after being filled and dried on the grid, and the plate is the core of the lead-acid battery. The grid is like a skeleton. , has a direct impact on the strength and service life of the entire plate.

The current grid ribs generally intersect vertically and horizontally vertically. This kind of grid has a long current conduction path and a large internal pressure drop, and the lead paste is easy to fall off due to uneven volume changes during use, resulting in capacity and life. lack of.

The Chinese utility model patent with the authorized notification number CN201435421Y discloses an electrode grid structure of a lead-acid battery, including a frame, a protruding plate ear is connected to the outside of the frame, and interlaced horizontal ribs and vertical ribs are connected inside the frame The cross-sectional height of the vertical ribs is the same as that of the frame, the cross-sectional height of the horizontal ribs is 15-30% lower than that of the frame, and the vertical ribs are in a radial layout with the ears as the center.

The Chinese utility model patent with the authorized announcement number CN201741750U discloses a grid for lead-acid batteries, including a frame, a protruding plate ear is provided outside the frame, and criss-cross bars are arranged inside the frame and vertical ribs, the horizontal ribs are uniformly distributed, the end of the vertical ribs close to the plate ear is inclined to the plate ear, the thickness of the vertical ribs is equal to the thickness of the frame, and the thickness of the vertical ribs is equal to the thickness of the frame. The bottom is provided with supporting feet, and the vertical ribs are radially distributed around the lugs.

The Chinese utility model patent whose authorized notification number is CN203406378U discloses a lead-acid battery grid, which is composed of tabs, a frame and ribs arranged in the frame, the tabs are arranged on the upper end of the frame, and the ribs include Horizontal ribs and vertical ribs, horizontal ribs and vertical ribs are interlaced to form a network structure, horizontal ribs are arranged horizontally and parallel, vertical ribs are radially distributed along the middle of the frame on the side of the tab, and vertical ribs are close to the tab Starting from the third vertical rib at one end, at least eight vertical ribs are provided with rib branches, and the rib branches are connected with the vertical ribs through transitional forks, and the transitional forks are arranged at the middle and upper parts of the vertical ribs, and the rib branches are connected with the vertical ribs. The ribs are arranged alternately.

Contents of the invention

Aiming at the problem of long grid current conduction path and large internal pressure drop in the prior art, the invention provides a lead storage battery grid, which has a short current conduction path and small internal resistance.

A lead storage battery grid, comprising a frame composed of upper frame ribs, lower frame ribs and two vertical frame ribs, the horizontal ribs and longitudinal ribs interlaced in the frame to form a network structure, and the For the tabs on the ribs on the upper frame, the longitudinal ribs are slanted towards the location of the tabs, and their extension lines intersect at a point, which is located directly above the tabs, and the distance between the ribs of the upper and lower frames and the The ratio of the distance between the intersection point and the lower frame rib is the golden ratio. That is, the ratio of the distance between the upper and lower frame ribs to the distance between the intersection point and the lower frame rib is about 0.618. The end points of all longitudinal ribs to the intersection point are straight line segments, the distance of the straight line segment is the shortest, the size of the resistance is proportional to the length of the ribs, the distance is the shortest, and the internal resistance is the smallest. If the extended longitudinal ribs finally do not intersect at one point, the current conduction path will eventually become a dispersed state, and the dispersion of the conduction path will lead to the dispersion of the conduction current value. The current in the dispersed state is not conducive to the instantaneous discharge of the battery. When the extended longitudinal ribs finally intersect at one point, the current value at this point will be the sum of the current of the entire plate, so the instantaneous current value is increased to improve the high-current discharge performance. When the battery is discharged, its discharge performance and service life are important indicators. If the discharge depth per unit time is too large, the life will be shortened. And when the discharge capacity of the storage battery is 60% to 65% of the whole storage battery, it is charged to ensure the service life.

The angle between two adjacent longitudinal ribs is 3 degrees.

The height of the tab is H, the distance between the outer edge of the tab and the midpoint of the rib of the upper frame is L, and the intersection point of the tab and the rib of the upper frame is an ellipse with 2L as the major axis and 2H as the minor axis. focus.

The width of the lug base gradually increases. Strengthen the connection effect between the tab and the upper frame rib, and it is not easy to cause deformation and cracks due to the heat generated by the battery when it is working.

The longitudinal ribs between the lower frame ribs and their adjacent transverse ribs are connected hand to tail in a zigzag shape. The bottom of the battery is easily damaged during the manufacturing process of the pole plate and when the battery is shaken, so this design is more conducive to the effective retention of active materials.

The width of the longitudinal rib gradually increases from the lower frame rib to the upper frame rib. Because the utilization rate of the active material on the upper part of the plate is higher, the thicker longitudinal ribs on the upper part will reduce the internal resistance, which is conducive to instantaneous current collection.

The upper frame rib and the vertical frame rib near the tab are thicker than the lower frame rib and the other vertical frame rib. The active material utilization rate of the upper frame ribs and the vertical frame ribs close to the tabs is relatively high, so thickening will reduce internal resistance, which is conducive to instantaneous current collection.

The width of the upper frame rib and the vertical frame rib near the tab is 3 mm, and the width of the lower frame rib and another vertical frame rib is 2 mm.

One end of the transverse rib is a tapered segment with gradually changing width. The side close to the tapered section is the gate of the grid, and the side of the transverse rib near the gate is thickened to form a tapered section, so that the amount of lead liquid flowing in per unit time during the casting process increases, which is beneficial to casting Forming is also conducive to maintaining the active material in the vertical direction of the pole plate.

The longitudinal ribs of the lead-acid storage battery grid of the present invention are obliquely gathered towards the position of the tabs, and their extension lines intersect at one point, and the end points of all the longitudinal ribs to the intersection point are straight line segments, the distance of the straight line segment is the shortest, and the resistance is the same as The length of the ribs is proportional to the size, the distance is the shortest, and the internal resistance is the smallest; the ratio of the distance between the ribs on the upper and lower frames and the distance between the intersection point and the ribs on the lower frame is the golden ratio, so that the discharge depth per unit time is not easy to be too large. Effectively guarantee the service life.

Description of drawings

Fig. 1 is the structure schematic diagram of the lead storage battery grid of the present invention.

Figure 2 is a schematic diagram of the inclination direction and extension line of the longitudinal rib

Figure 3 is a schematic diagram of the location of the tabs.

Detailed ways

Example 1

As shown in Figure 1, a lead-acid battery grid includes a frame composed of upper frame ribs 1, lower frame ribs 2 and two vertical frame ribs, and the horizontal ribs in the frame are criss-crossed to form a network structure. 5 and the longitudinal rib 6, and the pole ear 7 arranged on the upper frame rib 1, the two vertical frame ribs are respectively the vertical frame rib 3 far away from the pole ear 7 and the vertical frame rib close to the pole ear Article 4.

In order to enhance the connection effect between the tab 7 and the rib 1 of the upper frame, and prevent deformation and cracks caused by the heat generated by the battery during operation, the width of the base of the tab 7 is gradually increased. During the manufacturing process of the plate and when the battery is shaken, its bottom is easily damaged. Therefore, in order to be more conducive to the effective retention of the active material, the longitudinal rib 8 between the lower frame rib 2 and its adjacent transverse rib 5 is hand-tailed. Connected in a jagged shape. In order to improve the utilization rate of the active material on the upper part of the pole plate, the width of the longitudinal ribs 6 gradually increases from the ribs 2 of the lower frame to the ribs 1 of the upper frame, which is conducive to instantaneous current collection.

The active material utilization rate of the upper frame rib 1 and the vertical frame rib 4 close to the tab is higher, and the upper frame rib 1 and the vertical frame rib 4 close to the tab 7 are designed to be lower than the lower frame rib 2 And another vertical frame rib 3 is thicker, and thickening will reduce internal resistance, which is conducive to instantaneous current collection. In one embodiment, the upper frame rib 1 and the vertical frame rib 4 close to the tab 7 have a width of 3 mm, and the lower frame rib 2 and another vertical frame rib 3 have a width of 2 mm.

One end of the transverse rib 5 is a tapered segment 9 with a gradually changing width. The side close to the tapered section 9 is the gate of the grid, and the side of the transverse rib 5 close to the gate is thickened to form a tapered section 9, so that the amount of lead liquid flowing in per unit time during the casting process increases, both It is beneficial to casting and forming, and is also beneficial to the maintenance of the active material in the vertical direction of the pole plate.

As shown in FIG. 2 , the longitudinal ribs 6 converge obliquely toward the orientation of the tab 7 , and their extension lines intersect at a point O, which is located directly above the tab 7 . The angle between two adjacent longitudinal ribs 6 is 3 degrees. The end points of all longitudinal ribs 6 to the intersection point O are straight line segments, the distance of the straight line segment is the shortest, the resistance is proportional to the length of the ribs, the distance is the shortest, and the internal resistance is the smallest. If the extended longitudinal ribs 6 do not intersect at one point in the end, the current conduction path will eventually become dispersed, and the dispersion of the conduction path will lead to the dispersion of the conduction current value. The current in the dispersed state is not conducive to the instantaneous discharge of the battery. When the extended longitudinal ribs 6 finally intersect at one point, the current value at this point will be the sum of the current of the entire plate, so the instantaneous current value is increased to improve the high-current discharge performance.

The distance L1 between the rib 1 of the upper frame and the rib 2 of the lower frame, the distance between the intersection point O and the rib 2 of the lower frame is L2, and the ratio of L1 to L2 is the golden ratio, which is about 0.618. When the battery is discharged, its discharge performance and service life are important indicators. If the discharge depth per unit time is too large, the service life will be shortened, and when the discharge capacity of the battery is 60% to 65% of the entire battery, it should be charged. To ensure the service life.

As shown in Figure 3, the height of the tab 7 is H, the distance between the outer edge of the tab 7 and the midpoint of the upper frame rib 1 is L, and the intersection point between the tab 7 and the upper frame rib 1 is 2L as the long axis, 2H is the focus of the ellipse with the minor axis. All the currents of the plates are finally conducted through the tabs. After the positive and negative plates are assembled into a pole group, the two current converging points are located at the focal point of the ellipse. When the battery is discharged, the current flows from the negative pole to the positive pole, and when the battery is charged, the current flows from the positive pole to the negative pole. When the current converging point is located at the focal point of the ellipse, the electric field curve at the focal point is the densest, and the electric field intensity is the strongest where the electric field curve is dense. The electric field lines at one focal point of the ellipse are all reflected to the other focal point through the elliptical surface, which means that whether it is charging or discharging, the current generated by the positive and negative electrodes is 100% utilized, so the instantaneous current value generated by the grid designed with the elliptical focal point will be significantly improved.

Example 2

In the grid in Embodiment 1, the longitudinal ribs are obliquely gathered towards the orientation of the tabs, and their extension lines intersect at a point, which is located directly above the tabs, and the distance between the upper and lower frame ribs and the intersection point and The ratio of the spacing between ribs on the lower frame is the golden section ratio, and the angle between two adjacent longitudinal ribs is 3 degrees (D); as a comparison grid, the extension lines of the longitudinal ribs intersect at one point, and the intersection point The intersection of the grids of Example 1 deviates 8 mm upward in the vertical direction (D8).

After assembling the above two grids into a 6-EVF-200 storage battery, the large current discharge at different temperatures was detected. The measured data are shown in Table 1. Compared with the comparison group, the storage battery prepared by the grid in Example 1 was used. Its high current discharge time is longer.

Table 1

Example 3

In the grid in Embodiment 1, the longitudinal ribs are obliquely gathered towards the orientation of the tabs, and their extension lines intersect at a point, which is located directly above the tabs, and the distance between the upper and lower frame ribs and the intersection point and The ratio of the spacing of the ribs in the lower frame is the golden ratio (H); as a contrasting grid, the extension lines of the longitudinal ribs intersect at one point, and the intersection point is in the horizontal direction than the corresponding intersection point of the grid in Example 1 (i.e. Transversely) deviates 12mm (H12) to the outside (that is, the side of the vertical frame rib that is closer to the tab) and 12mm (H-12) to the inside, while the position of the tab remains unchanged.

The three kinds of grids were respectively assembled with 6-EVF-200 batteries, and then the measured life data at different temperatures were tested. The results are shown in Table 2. The battery prepared using the total grid of Example 1 has a relatively long life.

Table 2

Example 4

For the grid in Example 1, the height of the tab is H, the distance between the outer edge of the tab and the midpoint of the rib on the upper frame is L, and the intersection point between the tab and the rib on the upper frame is 2L as the long axis and 2H as the short The focal point (T) of the ellipse of the axis; as a comparison grid, the intersection point of its lug and the rib of the upper frame deviates from the focus of the ellipse by 10mm to the outside (T10), or deviates from the focus of the ellipse by 10mm to the inside (T-10).

The above three kinds of grids were respectively assembled with 6-EVF-200 batteries, and then the measured data of instantaneous current values at different temperatures were detected. The results are shown in Table 3. Using the grids prepared in Example 1, the instantaneous current increases big.

table 3

Example 5

In the grid in Example 1, the longitudinal ribs between the ribs of the lower frame and its adjacent transverse ribs are connected hand-to-tail in a zigzag shape (SA); as a comparison, the transverse ribs and longitudinal ribs in the prior art are used There is no such serrated design (SI) in the criss-cross pattern. During the process of manufacturing the plate, the comparison data of the defect rate generated by the bottom of the two is shown in Table 4. It can be found that this serrated design can be used to a certain extent. Avoid the occurrence of defective rate at the bottom of the plate.

Table 4

Claims (9)

1. The utility model provides a lead accumulator grid, includes the frame that comprises last frame rib, lower frame rib and two vertical frame ribs, and horizontal rib and the vertical rib of crisscross formation network structure in the frame to and set up the utmost point ear on last frame rib, its characterized in that, vertical rib draws in to the position slope that the utmost point ear is located, and their extension line intersects in a point, and this intersection point is located utmost point ear directly over, and the ratio of the interval of upper and lower frame rib and the interval of this intersection point and lower frame rib is golden section proportion.

2. The lead storage battery grid of claim 1 wherein the angle between adjacent longitudinal ribs is 3 degrees.

3. The lead storage battery grid according to claim 1, wherein the height of the tab is H, the distance between the outer edge of the tab and the midpoint of the upper frame rib is L, and the intersection point of the tab and the upper frame rib is the focal point of an ellipse with 2L as the major axis and 2H as the minor axis.

4. The lead storage battery grid of claim 1, wherein the tab base has a progressively increasing width.

5. The lead storage battery grid of claim 1 wherein the longitudinal ribs between the lower frame ribs and their adjacent transverse ribs are serrated end to end.

6. The lead storage battery grid of claim 1, wherein the longitudinal ribs increase in width from the lower rim ribs to the upper rim ribs.

7. The lead storage battery grid of claim 1, wherein the upper rim rib and the vertical rim rib adjacent to the tab are thicker than the lower rim rib and the other vertical rim rib.

8. The lead storage battery grid of claim 7, wherein the upper rim rib and the vertical rim rib adjacent to the tab have a width of 3mm and the lower rim rib and the other vertical rim rib have a width of 2mm.

9. The lead storage battery grid of claim 1, wherein one end of the transverse ribs is a tapered section of gradual width.

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