Lead storage battery pole group

Abstract

The utility model relates to the technical field of lead storage batteries, in particular to a lead storage battery plate group which comprises a partition plate and a plurality of positive plates and negative plates, the positive plates and the negative plates are alternately arranged, the partition plate is used for separating the positive plates from the negative plates, each positive plate comprises a positive plate grid and a positive active material coated on the positive plate grid, and the partition plate is used for separating the positive plates from the negative plates. The negative plate comprises a negative plate grid and a negative active material coated on the negative plate grid, the positive plate grid and / or the negative plate grid comprises a frame, one side of the frame is provided with a tab, and the other side of the frame is provided with a first arc-shaped structure; the frame is provided with a vertical rib and a plurality of arc-shaped ribs, the vertical rib extends from the tab to a first arc-shaped structure, the arc-shaped ribs are transversely arranged on the frame, the bending direction of the first arc-shaped structure is consistent with that of the arc-shaped ribs, the partition plate is provided with a second arc-shaped structure, and the second arc-shaped structure is matched with the first arc-shaped structure. One side, provided with the first arc-shaped structure, of the positive plate or the negative plate is positioned in the partition plate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lead-acid batteries, and more particularly to a lead-acid battery electrode group. Background Art

[0002] Lead-acid batteries are a common type of battery and play an important role in energy storage and power supply. Lead-acid batteries use chemical reactions between lead and lead dioxide to store and release energy. When the battery is charged, sulfuric acid in the electrolyte converts lead dioxide on the lead plates into lead and lead sulfate. When the battery is discharged, the reaction is reversed, and lead sulfate is reconverted into lead dioxide and lead. The recycling rate of lead-acid batteries can reach more than 95%. Due to its low cost, mature technology, stable quality, high reliability, good applicability and many other advantages, it is widely used.

[0003] Lead-acid batteries mainly consist of positive plates, negative plates, separators and electrolytes. The positive and negative plates are composed of active materials and grids. As the carrier and conductor of the active material, the active material is coated on the grid and becomes a plate after curing and drying. Different plates in the same electrode group are welded through tabs to form a parallel connection.

[0004] Chinese Patent No. ZL201820516717.5 discloses a lead-acid battery electrode group, which includes a positive plate, a negative plate and a separator disposed between the positive and negative plates. The separator includes a coarse fiber layer and a fine fiber layer. The hair surfaces of the coarse fiber layer and the fine fiber layer face outward, and the smooth surfaces face inward. The separator is folded into a U-shaped structure. The coarse fiber layer of the separator is in contact with the positive plate, and the fine fiber layer is in contact with the negative plate. Although this patent reduces the risk of short circuit in the electrode group to a certain extent, in this patent, the utilization rate of the lower active material far from the tab is significantly lower than that of the upper part. In addition, sulfuric acid settles under the action of gravity, resulting in accelerated grid corrosion in the upper part of the electrode group due to high active material utilization rate and high current density, and sulfation in the lower part of the electrode group due to low active material utilization rate and high sulfuric acid density, which seriously affects the electrical performance of lead-acid batteries. Utility Model Content

[0005] In view of the deficiencies or problems existing in the prior art, the present disclosure provides a lead-acid battery electrode group in which the utilization rates of the upper and lower active materials are relatively consistent, which can greatly improve the electrical performance of lead-acid batteries.

[0006] The technical solution adopted by the present disclosure to solve the above technical problems is as follows: A lead-acid battery plate group includes a separator and a plurality of alternately arranged positive plates and negative plates. The separator is used to separate the positive plates and negative plates. The positive plate includes a positive grid and positive active material coated on the positive grid. The negative plate includes a negative grid and negative active material coated on the negative grid. The positive grid and / or the negative grid includes a frame. One side of the frame is provided with a pole ear, and the other side is provided with a first arc structure. Vertical ribs and a plurality of arc ribs are provided on the frame. The vertical ribs extend from the pole ear to the first arc structure. The arc ribs are horizontally arranged on the frame. The bending direction of the first arc structure is the same as that of the arc ribs. The separator is provided with a second arc structure, which is adapted to the first arc structure. The side of the positive plate or the negative plate with the first arc structure is located in the separator.

[0007] As a preferred embodiment, the separator includes a first plate body and a second plate body arranged in parallel. One side of the first plate body is provided with a first arc edge, and one side of the second plate body is provided with a second arc edge. The second arc structure is formed by connecting the side of the first plate body with the first arc edge and the side of the second plate body with the second arc edge.

[0008] As a preferred embodiment, the positive plate or the negative plate is arranged between the first plate body and the second plate body, and the first plate body and the second plate body have the same shape.

[0009] As a preferred embodiment, after the positive plate or the negative plate is placed in the separator, the first plate body and the second plate body are 2-3 mm higher than the positive plate or the negative plate.

[0010] As a preferred embodiment, after the positive plate or the negative plate is placed in the separator, the two sides of the first plate body and the second plate body are 2-3 mm wider than the positive plate or the negative plate.

[0011] As a preferred embodiment, the distance between two adjacent arc ribs decreases sequentially from the pole ear end to the first arc structure end.

[0012] As a preferred embodiment, the frame includes a first side edge, a second side edge, and two parallel third side edges. The first side edge connects the first ends of the two third side edges, and the second side edge connects the second ends of the two third side edges. The first arc structure is arranged on the second side edge, and the pole ear is arranged on the first side edge.

[0013] As a preferred embodiment, the vertical ribs are arranged between the two third side edges and are parallel to the third side edges.

[0014] As a preferred embodiment, the midpoint of the first side edge is the first midpoint, and the midpoint of the second side edge is the second midpoint. The vertical ribs are arranged on the connection line between the first midpoint and the second midpoint.

[0015] As a preferred embodiment, the connection between the tab and the first side is located on the line connecting the first midpoint and the second midpoint.

[0016] As a preferred embodiment, the positive tab is disposed on the positive plate, the negative tab is disposed on the negative plate, and an insulating block is provided between the positive tab and the negative tab.

[0017] As a preferred embodiment, the width ratio of the vertical rib to the width of the third side is 1.5:1 to 2:1.

[0018] As a preferred embodiment, the tab includes a first portion and a second portion. The first end of the first portion is connected to the first side, the second end of the first portion is connected to the second portion, and the angle between the first portion and the first side is an acute angle or an obtuse angle.

[0019] As a preferred embodiment, the separator is a porous structure.

[0020] Compared with existing products, since the positive grid and / or the negative grid are provided with a first arc structure, the arc ribs are horizontally disposed in the frame, and the bending direction of the first arc structure is the same as the bending direction of the arc ribs, so that the positive grid and / or the negative grid form an equipotential surface, and the current flows through each position of the positive grid and / or the negative grid from the tab, greatly improving the consistency of the current density, making the utilization rate of the active material carried on the positive grid and / or the negative grid more uniform, delaying the corrosion of the positive grid and the sludging of the active material, and the sulfation of the active material of the negative grid; the separator is provided with a second arc structure, the second arc structure is adapted to the first arc structure, and the side of the positive plate or the negative plate provided with the first arc structure is located in the separator. Such a setting enables the bottom of the positive plate or the negative plate to fit well with the bottom of the separator to ensure the good performance of the electrical properties of the electrode group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Hereinafter, the present application will be further described in detail with reference to the drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 is one of the schematic structural diagrams of a lead-acid battery electrode group of the present disclosure;

[0023] Figure 2 is another schematic structural diagram of a lead-acid battery electrode group of the present disclosure;

[0024] Figure 3 is a cross-sectional view of a lead-acid battery electrode group of the present disclosure;

[0025] Figure 4 is a partial enlarged view of location A in the present disclosure; Figure 3 in the present disclosure;

[0026] Figure 5 is a schematic structural view of the partition plate of the present disclosure;

[0027] Figure 6 is a schematic structural view of the positive grid (negative grid) of the present disclosure.

[0028] Explanation of reference numerals in the drawings:

[0029] 1, vertical rib; 2, arc rib; 3, tab; 4, partition plate; 5, first side; 6, second side; 7, third side; 10, second arc structure; 11, first plate body; 12, second plate body; 13, positive plate; 14, negative plate; 15, insulating block. Specific embodiments

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0031] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0032] Please refer to Figures 1 to 4 , Figure 6As shown in the figure, the present disclosure provides a lead-acid battery plate group, which includes a separator 4 and a plurality of alternately arranged positive plates 13 and negative plates 14. The separator 4 is used to separate the positive plates 13 and the negative plates 14. The positive plate 13 includes a positive grid and a positive active material coated on the positive grid. The negative plate 14 includes a negative grid and a negative active material coated on the negative grid. The positive grid and / or the negative grid includes a frame. One side of the frame is provided with a tab 3, and the other side is provided with a first arc structure. Vertical ribs 1 and a plurality of arc ribs 2 are arranged on the frame. The vertical ribs 1 extend from the tab 3 towards the first arc structure. The arc ribs 2 are arranged horizontally on the frame. The bending direction of the first arc structure is the same as that of the arc ribs 2, so that the positive grid and / or the negative grid form an equipotential surface, and the current flows through each position of the positive grid and / or the negative grid from the tab 3, greatly improving the uniformity of the current density. The separator 4 is provided with a second arc structure 10. The side of the positive plate 13 or the negative plate 14 with the first arc structure is located in the separator 4. The second arc structure 10 is adapted to the first arc structure, so that the bottom of the positive plate 13 or the negative plate 14 can be better attached to the bottom of the separator 4, thereby enabling the electrical performance of the plate group to be better exerted. The function of the separator 4 in this application is to separate the positive plates 13 and the negative plates 14, and they are arranged in the order of negative plate 14 - separator 4 - positive plate 13 - separator 4 - negative plate 14 - separator 4 - positive plate 13... or positive plate 13 - separator 4 - negative plate 14 - separator 4 - positive plate 13 - separator 4 - negative plate 14... to avoid short circuits caused by contact between the positive plates 13 and the negative plates 14. The present disclosure is described in the arrangement order of negative plate 14 - separator 4 - positive plate 13 - separator 4 - negative plate 14 - separator 4 - positive plate 13... (that is, the positive plates 13 are arranged in the separator 4).

[0033] It should be noted that in this application, the positive grid can adopt the above structure, and the negative grid can adopt the structure in the prior art (in order to facilitate subsequent assembly, an arc structure consistent with the first arc structure should be provided on the side of the negative grid frame away from the tab 3. Except for this, the other structures of the negative grid are the same as those in the prior art); alternatively, the negative grid can adopt the above structure, and the positive grid can adopt the structure in the prior art (in order to facilitate subsequent assembly, an arc structure consistent with the first arc structure should be provided on the side of the positive grid frame away from the tab 3. Except for this, the other structures of the positive grid are the same as those in the prior art). Adopting the above structure for either the positive grid or the negative grid will be helpful for extending the life of the lead-acid battery. Preferably, both the positive grid and the negative grid in this embodiment adopt the above structure. In this way, the utilization rates of the active materials of the positive grid and the negative grid will be more uniform, alleviating the corrosion of the positive grid and the sludging of the active materials, and also alleviating the sulfation of the active materials of the negative grid, thereby further extending the battery life. In this embodiment, although the positive grid of the positive electrode plate 13 and the negative grid of the negative electrode plate 14 adopt the same structure, the alloys and thicknesses actually used will vary according to requirements. Generally speaking, the positive grid of the positive electrode plate 13 will be slightly thicker than the negative grid of the negative electrode plate 14. In this application, the positive active material is uniformly coated on both sides of the positive grid by extrusion to form the positive electrode plate 13, and the negative active material is uniformly coated on both sides of the negative grid by extrusion to form the negative electrode plate 14. The specific operation process is the prior art and will not be elaborated in detail in this application. The separator 4 is made of glass fiber and has a porous structure, so that the electrolyte can pass through the separator 4.

[0034] Please refer to Figure 5 As shown, the separator 4 includes a first plate body 11 and a second plate body 12 arranged in parallel. The heights and widths of the first plate body 11 and the second plate body 12 are the same. A first arc edge is provided on one side of the first plate body 11, and a second arc edge is provided on one side of the second plate body 12. The second arc structure 10 is formed by connecting the side of the first plate body 11 with the first arc edge and the side of the second plate body 12 with the second arc edge. The positive electrode plate 13 is arranged between the first plate body 11 and the second plate body 12. After the positive electrode plate 13 is placed in the separator 4, the bottom of the positive electrode plate 13 fits with the bottom of the separator 4.

[0035] Particularly, after the positive electrode plate 13 is placed in the separator 4, the first plate body 11 and the second plate body 12 are 2-3 mm higher than the positive electrode plate 13, and the two sides of the first plate body 11 and the second plate body 12 are 2-3 mm wider than the positive electrode plate 13. Such a setting is to completely cover the positive electrode plate 13 with the separator 4 and prevent the left and right sides or the upper side of the positive electrode plate 13 from exceeding the first plate body 11 and the second plate body 12 and contacting the negative electrode plate 14, resulting in a short circuit.

[0036] It should be noted that on the positive electrode plate 13 or the negative electrode plate 14, during the process of current conduction from the tab 3 from top to bottom, the current density gradually decreases. In order to improve the consistency of the current density of the upper and lower parts of the positive electrode plate 13 or the negative electrode plate 14 and the consistency of the utilization rate of the active material in the upper and lower parts, the distance between two adjacent arc-shaped ribs 2 in the present disclosure gradually decreases from the tab 3 end to the first arc-shaped structure end. By reducing the distance between the arc-shaped ribs 2 on the positive grid and the negative grid, the current density acting on the unit area is made the same. Coupled with the effect of the equipotential surface, the consistency of the utilization rate of the active material in the upper and lower parts of the positive electrode plate 13 or the negative electrode plate 14 is further improved.

[0037] As Figure 6 shown, in an embodiment of the present disclosure, the frame includes a first side 5, a second side 6, and two parallel third sides 7. The first side 5 connects the first ends of the two third sides 7, the second side 6 connects the second ends of the two third sides 7, the first arc-shaped structure is arranged on the second side 6, and the tab 3 is arranged on the first side 5. A part of the arc-shaped ribs 2 are connected to the first side 5, and a part of the arc-shaped ribs 2 are connected to the two third sides 7. The vertical rib 1 is arranged between the two third sides 7 and is parallel to the third sides 7. Specifically, the midpoint of the first side 5 is the first midpoint, the midpoint of the second side 6 is the second midpoint, the vertical rib 1 is arranged on the connection line between the first midpoint and the second midpoint, and the vertical rib 1 divides each arc-shaped rib 2 into two symmetrical parts. The current density and the utilization rate of the active material of the symmetrical parts are the same, thereby further improving the consistency of the current density flowing through each point of the positive grid and the negative grid and the consistency of the utilization rate of the active material.

[0038] It should be noted that there is only one vertical rib 1 in the entire frame, which is arranged in the exact middle of the frame. The width ratio of the vertical rib 1 to the width of the third side 7 is 1.5:1 to 2:1, preferably 2:1. Increasing the width (cross-sectional area) of the vertical rib 1 can reduce the loss during the current conduction process, improve the consistency of the current in the upper and lower parts of the vertical rib 1, thereby improving the consistency of the current density on each arc-shaped rib 2, and at the same time can also improve the corrosion resistance of the vertical rib 1.

[0039] Further, the positive electrode tab 3 is provided on the positive electrode plate 13, and the negative electrode tab 3 is provided on the negative electrode plate 14. To prevent the positive electrode tab 3 from contacting the negative electrode tab 3, an insulating block 15 is provided between the positive electrode tab 3 and the negative electrode tab 3. Preferably, the tab 3 includes a first part and a second part. The first part is the root of the tab 3, and the second part is the free end of the tab 3. The first end of the first part is connected to the first side 5, the second end of the first part is connected to the second part, the angle between the first part and the first side 5 is an acute angle or an obtuse angle, and the angle between the first part and the second part is an obtuse angle. Such a setting makes the first parts of the positive and negative tabs 3 gradually stagger from bottom to top, and the second parts are completely staggered, further preventing the positive electrode tab 3 from contacting the negative electrode tab 3 and causing a short circuit.

[0040] The above has introduced the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A lead-acid battery pole group, characterized in that: The invention comprises a separator (4) and a plurality of alternately arranged positive plates (13) and negative plates (14), wherein the separator (4) is used to separate the positive plate (13) from the negative plate (14), wherein the positive plate (13) comprises a positive grid and a positive active material coated on the positive grid, and the negative plate (14) comprises a negative grid and a negative active material coated on the negative grid, and wherein the positive grid and / or the negative grid comprises a frame, wherein a pole ear (3) is arranged on one side of the frame and a first arc-shaped structure is arranged on the other side; The frame is provided with vertical ribs (1) and a plurality of arcuate ribs (2), the vertical ribs (1) extending from the pole ear (3) to the first arcuate structure, the arcuate ribs (2) are arranged transversely on the frame, the bending direction of the first arcuate structure is consistent with the bending direction of the arcuate ribs (2), the separator (4) is provided with a second arcuate structure (10), the second arcuate structure (10) is adapted to the first arcuate structure, and the side of the positive plate (13) or the negative plate (14) provided with the first arcuate structure is located in the separator (4).

2. The lead-acid battery pole group according to claim 1, characterized in that: The partition (4) comprises a first plate body (11) and a second plate body (12) arranged in parallel, one side of the first plate body (11) is provided with a first arc-shaped edge, and one side of the second plate body (12) is provided with a second arc-shaped edge, and the second arc-shaped structure (10) is formed by connecting the side of the first plate body (11) provided with the first arc-shaped edge and the side of the second plate body (12) provided with the second arc-shaped edge.

3. The lead-acid battery pole group according to claim 2, characterized in that: The positive electrode plate (13) or the negative electrode plate (14) is arranged between the first plate body (11) and the second plate body (12); the first plate body (11) and the second plate body (12) have the same shape.

4. The lead-acid battery pole group according to claim 3, characterized in that: After the positive electrode plate (13) or the negative electrode plate (14) is placed in the separator (4), the first plate body (11) and the second plate body (12) are 2 to 3 mm higher than the positive electrode plate (13) or the negative electrode plate (14).

5. The lead-acid battery pole group according to claim 4, characterized in that: After the positive electrode plate (13) or the negative electrode plate (14) is placed in the separator (4), both sides of the first plate body (11) and the second plate body (12) are 2 to 3 mm wider than the positive electrode plate (13) or the negative electrode plate (14).

6. The lead-acid battery pole group according to claim 1, characterized in that: The distance between two adjacent arc-shaped ribs (2) decreases in sequence from the end of the pole ear (3) to the end of the first arc-shaped structure.

7. The lead-acid battery pole group according to claim 1, characterized in that: The frame comprises a first side (5), a second side (6) and two third side (7) arranged in parallel, the first side (5) connecting the first ends of the two third side (7), the second side (6) connecting the second ends of the two third side (7), the first arc-shaped structure being arranged on the second side (6), and the pole ear (3) being arranged on the first side (5).

8. The lead-acid battery pole group according to claim 7, characterized in that: The midpoint of the first side (5) is the first midpoint, the midpoint of the second side (6) is the second midpoint, and the vertical rib (1) is arranged on the connecting line of the first midpoint and the second midpoint.

9. The lead-acid battery pole group according to claim 8, characterized in that: The connection point between the pole ear (3) and the first side edge (5) is located on the connection line between the first midpoint and the second midpoint.

10. The lead-acid battery electrode group according to claim 1, characterized in that: The positive electrode lug (3) is arranged on the positive electrode plate (13), the negative electrode lug (3) is arranged on the negative electrode plate (14), and an insulating block (15) is arranged between the positive electrode lug (3) and the negative electrode lug (3).

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