CN-115602799-B - Lead-acid storage battery

CN115602799BCN 115602799 BCN115602799 BCN 115602799BCN-115602799-B

Abstract

The invention relates to a lead-acid storage battery, belongs to the technical field of lead storage batteries, and aims to solve the problems of uneven current distribution in the polar plate of the existing lead storage battery and short cycle life of the battery. The lead-acid storage battery comprises a single cell battery, the single cell battery comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked, each positive plate and each negative plate comprise a frame and a lug, each frame comprises an upper frame, a lower frame, a left frame and a right frame, each positive plate and each negative plate comprise a first lug and a second lug, the first lug and the second lug are symmetrically arranged on the upper frame along the length direction of the upper frame, the planes of the first lug and the second lug are parallel to the plate surface, the distance between the first lug and the second lug in the positive plate is d1, the distance between the first lug and the second lug in the negative plate is d2, d1 and d2 are different, and the sizes of the first lug and the second lug in the positive plate are the same. The lead-acid storage battery has long service life.

Inventors

HUANG WEIGUO
CHEN LI
WANG PENGWEI
LIU XIAOWEI

Assignees

超威电源集团有限公司

Dates

Publication Date: 20260505
Application Date: 20210707

Claims (5)

1. The lead-acid storage battery suitable for the power battery is characterized by comprising a single cell, wherein the single cell comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked, each positive plate and each negative plate comprise a frame (1) and a tab, and the frame (1) comprises an upper frame, a lower frame, a left frame and a right frame; The electrode lugs of each positive electrode plate and each negative electrode plate comprise a first electrode lug (31) and a second electrode lug (32), the first electrode lug (31) and the second electrode lug (32) are symmetrically arranged on the upper frame along the length direction of the upper frame, the planes of the first electrode lug (31) and the second electrode lug (32) are parallel to the electrode plate surface, the distance between the first electrode lug (31) and the second electrode lug (32) in the positive electrode plate is d1, the distance between the first electrode lug (31) and the second electrode lug (32) in the negative electrode plate is d2, d1 and d2 are different, and the sizes of the first electrode lug (31) and the second electrode lug (32) in the positive electrode plate are the same; a plurality of ribs (4) are also arranged in the frame (1); The ribs comprise a plurality of first ribs transversely distributed along the polar plate surface and a plurality of second ribs longitudinally distributed along the polar plate surface, wherein the second ribs positioned on the midvertical line of the upper frame are rectangular, and the other second ribs are gradually reduced in width along the direction away from the upper frame; The first ribs are V-shaped, and the openings face the upper frame; the first ribs are distributed, namely the distance between two adjacent first ribs is gradually reduced along the direction away from the upper frame; The first ribs of the upper part are the same in width along the direction away from the upper frame, the first ribs of the lower part are the same in width, the width of the first ribs of the upper part is larger than that of the first ribs of the lower part, and the number of the first ribs of the upper part accounts for 1/4-1/2 of the total first ribs.
2. The lead-acid battery according to claim 1, wherein the first tab (31) and the second tab (32) of the negative plate are the same size.
3. The lead-acid battery of claim 2, wherein the upper frame has a length of L1, L1 being greater than or equal to d1> d2.
4. The lead-acid battery of claim 2, wherein the upper frame has a length of L1, L1 being greater than or equal to d2> d1.
5. The lead-acid battery of claim 1, wherein in the positive plates of the single cell, the top end of the first tab is a first positive electrode busbar, the first positive electrode busbar connects the first tabs of the positive plates in parallel; In the negative plate of the single cell, the top end of the first lug is a first negative electrode busbar, the first negative electrode busbar connects the first lugs of the plurality of negative plates in parallel, the top end of the second lug is a second negative electrode busbar, and the second lug of the plurality of negative plates is connected in parallel by the second negative electrode busbar.

Description

Lead-acid storage battery Technical Field The invention relates to the field of lead-acid storage batteries, in particular to a lead-acid storage battery. Background Lead-acid batteries have been invented for over a hundred years since now, and are one of the most widely used chemical power sources worldwide. The raw materials are abundant in source, low in cost and renewable and recyclable. The accumulator is mainly composed of positive and negative polar plates, a separator, a battery case and other parts, and the polar plates are mainly composed of grids and active substances. The traditional lead-acid battery grid consists of a thick side frame and lugs, and is mainly used for supporting positive and negative electrochemical active substances and collecting current of the whole polar plate to flow out through the lugs. Therefore, the grid design needs to be easy to forge, and also meets the requirement that the surface of the grid has good contact and mechanical requirements with active substances, and meanwhile, current is uniformly distributed in the whole polar plate, and ohmic voltage drop is minimum. At present, the storage battery grids on the market are generally monopolar lug grids, positive and negative grid lugs are arranged on one side of the grids, and the designed battery can enable the utilization rate of active substances on the upper and lower parts of the polar plates to be uneven, and concentration differences exist between the upper and lower electrolyte, so that the service life of the battery is seriously influenced. If the high-current charge and discharge is performed, the internal resistance increases sharply, which may lead to thermal runaway and thus damage the battery. CN103840173B discloses a bipolar ear plate grid, which comprises an upper frame, a lower frame corresponding to the upper frame, a left frame, a right frame opposite to the left frame, a plurality of vertical ribs and a plurality of horizontal ribs, wherein the vertical ribs and the horizontal ribs are arranged in a crossing manner, the grid further comprises two lugs, the two lugs are respectively positioned on the upper frame and the lower frame of the grid and are arranged diagonally, the bipolar ear plate grid has the problem of complex process in the manufacturing process, and meanwhile, the sealing requirement is higher. The lead-acid storage battery plate prepared by the existing grid structure has uneven current distribution, large ohmic pressure drop, short cycle life of the battery or complex manufacturing process. Disclosure of Invention In view of the above analysis, the embodiment of the invention aims to provide a lead-acid storage battery, which at least can solve one of the problems of (1) uneven current distribution inside a polar plate of the existing lead-acid storage battery, large ohmic pressure drop and short cycle life of the battery, and (2) complex manufacturing process of the existing lead-acid storage battery. The invention provides a lead-acid storage battery, which comprises a single cell, wherein the single cell comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked, each positive plate and each negative plate comprises a frame and a tab, and each frame comprises an upper frame, a lower frame, a left frame and a right frame; The electrode lugs of each positive plate and each negative plate comprise a first electrode lug and a second electrode lug which are symmetrically arranged on the upper frame along the length direction of the upper frame, the planes of the first electrode lug and the second electrode lug are parallel to the plate surface, the distance between the first electrode lug and the second electrode lug in the positive plate is d1, the distance between the first electrode lug and the second electrode lug in the negative plate is d2, d1 is different from d2, and the sizes of the first electrode lug and the second electrode lug in the positive plate are the same. Further, in the negative plate, the first tab and the second tab are the same in size. Further, the length of the upper frame is L1, and L1 is more than or equal to d1> d2. Further, the length of the upper frame is L1, and L1 is more than or equal to d2> d1. Further, in the positive plate of the single cell, the top end of the first tab is a first positive electrode busbar, the first positive electrode busbar connects the first tabs of the positive plates in parallel, and the top end of the second tab is a second positive electrode busbar, and the second positive electrode busbar connects the second tabs of the positive plates in parallel; In the negative plate of the single cell, the top end of the first lug is a first negative electrode busbar, the first negative electrode busbar connects the first lugs of the plurality of negative plates in parallel, the top end of the second lug is a second negative electrode busbar, and the second lug of the plurality of neg