A high specific energy group

Abstract

The present application specifically discloses a high specific energy electrode group, including a plurality of separators and positive plates and negative plates arranged at intervals, wherein the separator is used to separate adjacent positive plates and negative plates; the grid structure in the positive plates and negative plates is the same; the grid includes a frame and at least two pole ears, a rib grid is provided in the frame, and the two pole ears are respectively located at the two ends of the frame; wherein the rib grid includes a first grid portion and a second grid portion, wherein the first grid portion is located in the middle of the grid, and the second grid portion is located on both sides of the first grid portion, and the grid density of the first grid portion is greater than the grid density of the second grid portion. A high specific energy electrode group is provided, which makes the electrical properties of the upper and lower parts of the electrode group more uniform by changing the structure of the electrode plate and the separator, thereby extending the cycle life of the battery and improving the specific energy of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of storage batteries, in particular to a high specific energy pole group. Background Art

[0002] The pole group refers to the collection of positive and negative poles in the battery. Furthermore, the pole group is an important component of the energy storage unit of the battery and the electrochemical reaction of the battery. The pole group is composed of pole plates and separators. The pole plates contain grids and active substances. The grids can be used to support the structure, conduct electricity, transfer electrons and promote material diffusion. The separators are used to isolate the positive and negative poles, organize the mixed flow of electrolytes and provide mechanical support.

[0003] In the prior art, for example, CN215496997U, a bipolar lug grid lead-acid battery, the lead-acid battery includes a single cell battery, the single cell battery includes a plurality of positive plates and a plurality of negative plates alternately stacked; each positive plate and each negative plate includes a frame and a lug, the frame includes an upper frame, a lower frame, a left frame and a right frame; the lugs of each positive plate and each negative plate include a first lug and a second lug, along the length direction of the upper frame, the first lug and the second lug are symmetrically arranged on the upper frame; the plane where the first lug and the second lug are located is parallel to the plate surface; in the positive plate, the distance between the first lug and the second lug is d1; in the negative plate, the distance between the first lug and the second lug is d2, d1 is different from d2.

[0004] The above-mentioned pole group scheme improves the uniformity of current distribution by changing the bipolar ears and grid rib structure of the upper frame, but it still has certain defects. The ears of each positive plate and each negative plate include a first ear and a second ear. Along the length direction of the upper frame, the first ear and the second ear are symmetrically arranged on the upper frame. The current density in the lower part of the grid away from the ear is small, the utilization rate of the active material is low, and the consistency of the utilization rate of the active material in the upper and lower parts of the grid is poor; the current density in the upper part of the grid is large, the corrosion progress is accelerated, the utilization rate of the active material in the lower part of the grid is low, and the active material is easily muddied, resulting in a reduced service life of the battery. Utility Model Content

[0005] The purpose of the utility model is to provide a high specific energy electrode group, by changing the structure of the electrode plate and the separator, so that the electrical properties of the upper and lower parts of the electrode group are more uniform, the cycle life of the battery is extended, and the specific energy of the battery is improved.

[0006] According to the purpose of the present application, a high specific energy electrode group is provided, comprising a plurality of partitions and positive plates and negative plates arranged at intervals, wherein the partitions are used to separate adjacent positive plates and negative plates; the grid structures in the positive plates and the negative plates are the same; the grid comprises a frame and at least two pole ears, a rib grid is provided in the frame, and the two pole ears are respectively located at the two ends of the frame; wherein the rib grid comprises a first grid portion and a second grid portion, the first grid portion is located in the middle of the grid, the second grid portion is located on both sides of the first grid portion, and the grid density of the first grid portion is greater than the grid density of the second grid portion.

[0007] In some embodiments, the separator is provided with a plate placement groove for mounting the positive plate or the negative plate; and one end of the plate placement groove is provided with an ear hole matching the electrode ear.

[0008] In some embodiments, the separator is made of ultra-fine glass fiber.

[0009] In some embodiments, reinforcing ribs are further provided in the frame; the reinforcing ribs are located in the middle of the grid, both ends of the reinforcing ribs are connected to the frame, and the first grid portion and the second grid portion are symmetrically arranged on both sides of the reinforcing ribs; the first grid portion and the second grid portion located on the same side of the reinforcing ribs have the same proportion.

[0010] In some embodiments, the first mesh portion is composed of transverse ribs and oblique ribs; the second mesh portion is composed of transverse ribs and vertical ribs; wherein the number of transverse ribs of the first mesh portion is the same as the number of transverse ribs of the second mesh portion, and the number of oblique ribs is twice the number of vertical ribs.

[0011] In some embodiments, the oblique ribs and the transverse ribs are staggered to form a V-shaped grid; the vertical ribs and the transverse ribs are staggered to form a well-shaped grid.

[0012] In some embodiments, the V-shaped structure formed by the oblique ribs opens toward the reinforcing ribs.

[0013] In some embodiments, the width of the oblique ribs is smaller than the width of the vertical ribs.

[0014] In some embodiments, the first grid portion and the second grid portion in the rib grid have the same proportion.

[0015] In some embodiments, the two pole ears are symmetrically arranged about the center point of the grid.

[0016] According to the technical solution of the utility model, the pole group includes a plurality of partitions and positive plates and negative plates arranged at intervals, the partitions are used to separate adjacent positive plates and negative plates, and the grid structures of the positive plates and the negative plates are the same; the grid includes a frame and at least two pole ears, a rib grid is provided in the frame, and the two pole ears are respectively located at the two ends of the frame, which can increase the current density at the two ends of the grid and balance the electrical properties of the upper and lower parts of the grid; further, the rib grid includes a first grid portion and a second grid portion, the first grid portion is located in the middle of the grid, and the second grid portion is located on both sides of the first grid portion, and the first The grid density of the grid portion is greater than that of the second grid portion. The first grid increases the current density through a larger grid density, thereby reducing the difference in current density between a portion of the grid far from the pole ear and a portion of the grid close to the pole ear, and improving the consistency of current density in various portions of the grid. This can prevent the upper portion of the grid from corroding too quickly, and slow down the muddling of active materials in the lower portion of the grid. Compared with traditional pole groups, the upper and lower portions of the pole group have an equal number of pole ears, and combined with the rib grid, the electrical properties of the upper and lower portions of the pole group can be made more uniform, thereby extending the cycle life of the battery and improving the specific energy of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present application will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. It should be noted that the drawings are only examples and are not drawn in proportion, and should not be used to limit the scope of protection of the present application, wherein:

[0018] Figure 1 A three-dimensional diagram of the pole group of this application;

[0019] Figure 2 A left side view of the pole group of this application;

[0020] Figure 3 A three-dimensional diagram of the partition of the present application;

[0021] Figure 4 A three-dimensional diagram of the electrode plate of the present application;

[0022] Figure 5 A three-dimensional assembly diagram of the electrode plate of the present application;

[0023] Figure 6 A three-dimensional diagram of the grid of the present application;

[0024] Figure 7 A front view of the grid of the present application;

[0025] In the figure: 1, partition; 11, plate groove; 12, ear hole; 2, positive plate; 3, negative plate; 4, grid; 40, active material; 5, frame; 6, pole ear; 7, rib grid; 71, horizontal rib; 72, oblique rib; 73, vertical rib; 8, first grid part; 9, second grid part; 10, reinforcing rib. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0027] Reference to "embodiment" herein means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The phrase appearing in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. It should be understood by those skilled in the art that the embodiments of the present invention may be combined with other embodiments without structural conflicts.

[0028] In the description of this article, unless otherwise clearly specified and limited, the technical terms "installed", "connected", "connected" and the like should be understood in a broad sense, and can be movable connection, fixed connection or integrated. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0029] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to having a specific orientation, being installed or operated in a specific orientation.

[0030] See also Figure 1 and Figure 2 , shown are a three-dimensional view of the pole group of the present application and a left view of the pole group, the pole group includes a plurality of partitions 1 and positive plates 2 and negative plates 3 arranged at intervals, the partition 1 is used to separate adjacent positive plates 2 and negative plates 3, usually, the pole group includes at least one partition 1, one positive plate 2 and two negative plates 3, wherein, in this embodiment, the partition 1 is located between the two negative plates 3, and the positive plate 2 is installed in the partition 1, and the positive plate 2 and the negative plate 3 are separated by the partition 1; wherein, the grid 4 in the positive plate 2 and the negative plate 3 has the same structure, the grid 4 includes a frame 5 and at least two pole ears 6, compared with the traditional pole group, the upper and lower parts of the pole group of the above scheme have the same number of pole ears 6, and the electrical properties of the upper and lower parts of the pole group are more uniform.

[0031] See also Figure 3, shown is a three-dimensional diagram of the partition of the present application, the partition 1 is provided with a plate placement groove 11 for installing the positive plate 2 or the negative plate 3, the cross-section of the partition 1 is U-shaped, and the plate placement groove 11 is located on the inner side of the partition 1. In the present embodiment, the positive plate 2 is installed in the plate placement groove 11; one end of the plate placement groove 11 is provided with a through ear hole 12 matching the pole ear 6. In the present embodiment, the positive plate 2 is installed in the partition 1, and the pole ear 6 at one end of the positive plate 2 passes through the through ear hole 12 and is located at the lower part of the pole group, so that the upper and lower parts of the pole group have the same number of pole ears 6.

[0032] Furthermore, the length of the partition 1 is 2 to 3 mm greater than the length of the frame 5 of the grid, the width of the partition 1 is 2 to 3 mm greater than the width of the frame 5 of the grid, and the lower ends of the two are in contact with each other.

[0033] Preferably, in this embodiment, the separator 1 is made of ultra-fine glass fiber material, which is non-conductive and can isolate the positive electrode plate 2 from the negative electrode plate 3 to avoid a short circuit caused by contact between the two.

[0034] See also Figure 4 and Figure 5 , shown are a three-dimensional diagram of the electrode plate of the present application and a three-dimensional assembly diagram of the electrode plate, wherein pole ears 6 are provided at both ends of the electrode plate, and preferably, the two pole ears 6 are symmetrically arranged about the center point of the electrode plate; wherein, in the present embodiment, the electrode plate includes a grid plate and an active material 40, the grid plate is located between the active materials 40, further, the active material 40 is bonded to the grid plate, and the active material is filled in the rib grid 7 of the grid plate.

[0035] See also Figure 6 and Figure 7 , shown are a stereoscopic view of the grid 4 of the present application and a front view of the grid 4, the frame 5 of the grid 4 is a rectangular frame 5, and the pole ear 6 is used as a contact plate during charging and discharging; a rib grid 7 is provided in the frame 5, and the rib grid 7 is formed by a plurality of ribs interlaced, and the structure of the rib grid 7 can adjust the current density of various parts of the grid 4; and the two pole ears 6 are respectively located at the two ends of the frame 5, the two pole ears 6 are located on the outside of the frame 5, and the two pole ears 6 are arranged back to back, which can improve the current density at the two ends of the grid 4 and increase the utilization rate of the active material.

[0036] Among them, the rib grid 7 includes a first grid portion 8 and a second grid portion 9, the outer contours of the first grid portion 8 and the second grid portion 9 are rectangular, the first grid portion 8 is located in the middle of the grid 4, the first grid portion 8 is located between the two second grid portions 9, and the second grid portion 9 is located on both sides of the first grid portion 8; regarding the grid density of the first grid portion 8 and the second grid portion 9, the grid density of the first grid portion 8 is greater than the grid density of the second grid portion 9, and the grid density is related to the current density and can increase the current density in the grid away from the pole ear 6; further, the first grid portion 8 and the second grid portion 9 in the rib grid 7 have the same proportion, which can reduce the current density difference between different parts of the grid 4 and improve the consistency of the current density at various locations of the grid 4.

[0037] Preferably, in this embodiment, a reinforcing rib 10 is further provided in the frame 5. The reinforcing rib 10 is in the shape of an elongated strip, and the cross-section of the reinforcing rib 10 is rectangular. The width of the reinforcing rib 10 is greater than the width of the frame 5. The reinforcing rib 10 is located in the middle of the grid 4, and both ends of the reinforcing rib 10 are connected to the frame 5. The reinforcing rib 10 can improve the structural strength of the middle part of the grid 4.

[0038] Furthermore, the rib grid 7 includes two first grid portions 8 and two second grid portions 9, the two first grid portions 8 are located in the middle of the grid 4, and the two first grid portions 8 are located between the two second grid portions 9, the grid density of the first grid portion 8 is greater than the grid density of the second grid portion 9, and the grid density setting scheme can increase the current density in the grid plate away from the pole ear 6; the first grid portion 8 and the second grid portion 9 are symmetrically arranged on both sides of the reinforcing rib 10, and the first grid portion 8 and the second grid portion 9 on the same side of the reinforcing rib 10 have the same proportion; the advantage of the above scheme is that the current density consistency of each part of the grid 4 is good, the utilization rate of the active substance is improved, the sulfation of the active substance is slowed down, and the consistency of the utilization rate of the active substance in each part of the grid 4 is increased.

[0039] The first grid portion 8 is composed of transverse ribs 71 and oblique ribs 72, and the second grid portion 9 is composed of transverse ribs 71 and vertical ribs 73; with respect to the transverse ribs 71, the transverse ribs 71 in the rib grid 7 are arranged parallel and spaced along the length axis of the grid plate, and the transverse ribs 71 are used to carry active substances, and the distribution of each transverse rib 71 is relatively uniform, wherein the number of transverse ribs 71 of the first grid portion 8 is the same as the number of transverse ribs 71 of the second grid portion 9; with respect to the oblique ribs 72 and the vertical ribs 73, the oblique ribs 72 and the vertical ribs The bars 73 are used to conduct current. The number of the oblique ribs 72 is twice the number of the vertical ribs 73. By increasing the number of the oblique ribs 72 to reduce the area of ​​the unit grid of the grid 4, the current density in the grid away from the pole ear 6 can be increased, thereby increasing the utilization rate of the active material in the middle of the grid 4; the width of the oblique ribs 72 is smaller than the width of the vertical ribs 73. By adjusting the width design of the oblique ribs 72 and the vertical ribs, the current density consistency of the distribution positions of the oblique ribs 72 and the vertical ribs 73 in the grid can be adjusted.

[0040] Preferably, in this embodiment, in the first mesh portion 8, the oblique ribs 72 and the transverse ribs 71 are staggered to form a V-shaped mesh, and the V-shaped structure formed by the oblique ribs 72 opens toward the reinforcing rib 10. Specifically, the ends of two adjacent oblique ribs 72 are connected to form a V-shaped rib, and the opening of the V-shaped rib faces the reinforcing rib 10; further, the open ends of two adjacent V-shaped ribs intersect, and the two intersecting oblique ribs 72 form an X-shaped rib.

[0041] In some embodiments, the oblique ribs 72 and the transverse ribs 71 in the first mesh portion 8 are staggered to form a W-shape, or the oblique ribs 72 and the transverse ribs 71 in the first mesh portion 8 are staggered to form a wavy mesh.

[0042] In some embodiments, when no reinforcing ribs 10 are provided in the frame 5 , the oblique ribs 72 and the transverse ribs 71 in the first mesh portion 8 are staggered to form a diamond mesh, and the ends of the four oblique ribs 72 are connected to form diamond ribs.

[0043] In this embodiment, in the second grid portion 9, the vertical ribs 73 and the transverse ribs 71 are staggered to form a tic-tac-toe grid, or in other words, the vertical ribs 73 and the transverse ribs 71 are staggered to form a cross grid; the vertical ribs 73 and the transverse ribs 71 are perpendicular to each other, and a plurality of vertical ribs 73 are arranged in parallel and at intervals; the vertical ribs 73 and the transverse ribs 71 intersect to form a rectangular grid.

[0044] Five transverse ribs 71 , six vertical ribs 73 and twelve oblique ribs 72 are respectively disposed on both sides of the reinforcing rib 10 .

[0045] In summary, the structure of the conventional grid 4 is composed of a frame 5, horizontal ribs 71, vertical ribs 73 and pole ears 6. The farther the grid 4 is from the pole ears 6, the smaller the current density, the lower the electric potential energy, and the lower the utilization rate of the active material, which results in poor consistency in the utilization rate of the upper and lower parts of the active material, which will lead to accelerated failure of the plate. In this embodiment, by changing the structure of the grid 4, the two pole ears 6 are symmetrically arranged about the center point of the grid 4. Specifically, the two pole ears 6 are diagonally arranged on the frame 5, which increases the length of the conduction path of the current in the active material. Combined with the above-mentioned reinforcing ribs 10 and the rib grid 7 structure, the current density in the symmetrical parts of the grid can be made uniform. Compared with the traditional grid 4 structure, the same current passes through the two pole ears 6 of the grid 4 to reach the inside of the grid 4. When the current passes through, the current density of each part of the grid 4 is consistent with its symmetrical position, thereby significantly improving the consistency of the current density of each part of the grid 4, significantly improving the utilization rate of the active material in the grid 4, slowing down the sulfation of the active material in the plate, and achieving consistency in the utilization rate of the active material at both ends of the grid 4; the advantage of the pole group solution composed of the above-mentioned partition 1, positive plate 2 and negative plate 3 is that the electrical properties of the upper and lower parts of the pole group can be made more uniform, the cycle life of the battery using the pole group is longer, and the specific energy value of the battery is improved.

[0046] The purpose of the above embodiments is to explain the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the claims of the present invention, the optimization or equivalent replacement of the structure of the parts involved, and the combination of the implementation methods in different embodiments without conflict of structure and principle, all fall within the protection scope of the present invention.

Claims

1. A high specific energy electrode group, comprising a plurality of separators (1) and positive plates (2) and negative plates (3) arranged at intervals, wherein the separators (1) are used to separate adjacent positive plates (2) and negative plates (3), It is characterized by: The grids (4) in the positive electrode plate (2) and the negative electrode plate (3) have the same structure; The grid (4) comprises a frame (5) and at least two tabs (6); a rib grid (7) is provided inside the frame (5), and the two tabs (6) are respectively located at two ends of the frame (5); The rib grid (7) comprises a first grid portion (8) and a second grid portion (9), the first grid portion (8) being located in the middle of the grid (4), the second grid portion (9) being located on both sides of the first grid portion (8), and the grid density of the first grid portion (8) being greater than the grid density of the second grid portion (9).

2. The high specific energy electrode group according to claim 1, characterized in that: The separator (1) is provided with a plate placement groove (11) for mounting a positive plate (2) or a negative plate (3); One end of the plate placement groove (11) is provided with an ear hole (12) matching the pole ear (6).

3. The high specific energy electrode group according to claim 1, characterized in that: The partition (1) is made of ultra-fine glass fiber material.

4. The high specific energy electrode group according to claim 1, characterized in that: The frame (5) is also provided with reinforcing ribs (10); The reinforcing rib (10) is located in the middle of the grid (4), the two ends of the reinforcing rib (10) are connected to the frame (5), the first grid portion (8) and the second grid portion (9) are symmetrically arranged on both sides of the reinforcing rib (10); the first grid portion (8) and the second grid portion (9) located on the same side of the reinforcing rib (10) have the same proportion.

5. The high specific energy electrode group according to claim 4, characterized in that: The first mesh portion (8) is composed of transverse ribs (71) and oblique ribs (72); The second mesh portion (9) is composed of transverse ribs (71) and vertical ribs (73); The number of the transverse ribs (71) of the first mesh portion (8) is the same as the number of the transverse ribs (71) of the second mesh portion (9), and the number of the oblique ribs (72) is twice the number of the vertical ribs (73).

6. The high specific energy electrode group according to claim 5, characterized in that: The oblique ribs (72) and the transverse ribs (71) are staggered to form a V-shaped grid; The vertical ribs (73) and the horizontal ribs (71) are staggered to form a grid in a tic-tac-toe pattern.

7. The high specific energy electrode group according to claim 6, characterized in that: The V-shaped structure formed by the oblique ribs (72) opens toward the reinforcing ribs (10).

8. The high specific energy electrode group according to claim 5, characterized in that: The width of the oblique ribs (72) is smaller than the width of the vertical ribs (73).

9. The high specific energy electrode group according to claim 1, characterized in that: The first grid portion (8) and the second grid portion (9) in the rib grid (7) have the same proportion.

10. The high specific energy electrode group according to claim 1, characterized in that: The two pole lugs (6) are symmetrically arranged about the center point of the grid (4).

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