Battery jar and lead storage battery

Abstract

The utility model relates to the technical field of lead storage batteries, in particular to a battery jar and a lead storage battery, the battery jar comprises a jar body and a plurality of first partition plates arranged in the jar body, the first partition plates divide the jar body into a plurality of unit cells, the unit cells comprise two first unit cells and a plurality of second unit cells, the two first unit cells are located at the two ends of the tank body respectively, the multiple second unit cells are located between the two first unit cells, and the size of the first unit cells is smaller than that of the second unit cells; the lead storage battery comprises a battery cover and the battery jar, the battery cover is arranged at the opening of the battery jar, and the battery cover is connected with the battery jar through epoxy resin.

Description

Technical Field

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

[0002] Among the commonly used rechargeable batteries, in addition to lithium batteries, lead-acid batteries are also a very important battery system. A lead-acid battery consists of electrode plates, separators, a battery case, and electrolyte, etc. Since the lead-acid battery was invented by Planté in 1859, it has a history of more than 150 years. Lead-acid batteries are a common type of storage battery and play an important role in energy storage and power supply. Lead-acid batteries use a chemical reaction between lead and lead dioxide to store and release energy. The recycling rate of lead-acid batteries can reach more than 95%, and they are widely used due to their many advantages such as low cost, mature technology, stable quality, high reliability, and good applicability.

[0003] The preparation of lead-acid batteries generally includes the manufacture of electrode plates and the assembly of electrode groups into a battery case. After the electrode groups are assembled in the lead-acid battery case, the electrode groups will expand during the charge and discharge process. In addition, the single cells in the middle part generate forces towards both ends, causing the single cells at both ends to expand and their volumes to increase, resulting in an increase in the acid content in the single cells at both ends, aggravating the corrosion of the positive grid and the sludging of the active material, and thus leading to the premature failure of the single cells at both ends. Summary of the Utility Model

[0004] In view of the deficiencies or problems in the prior art, the present disclosure provides a battery case and a lead-acid battery, which can effectively avoid the premature failure of the single cells at both ends.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is: a battery case, including a case body and a plurality of first separators arranged in the case body. The first separators divide the case body into a plurality of single cells. The single cells include two first single cells and a plurality of second single cells. The two first single cells are respectively located at both ends of the case body, and the plurality of second single cells are located between the two first single cells. The volume of the first single cell is smaller than that of the second single cell.

[0006] As a preferred embodiment, the volumes of the two first single cells are equal.

[0007] As a preferred embodiment, the volume of the first single cell is 3 - 5 mL smaller than that of the second single cell.

[0008] As a preferred embodiment, the case body includes two parallel first side plates, two parallel second side plates, and a bottom plate. Both ends of the first separator are respectively arranged on the two first side plates. The first separator is arranged parallel to the second side plates. The bottoms of the first single cell and the second single cell are arc-shaped surfaces; the first side plates, the second side plates, and the bottom plate are all flat surfaces.

[0009] As a preferred embodiment, both sides of the arc surface extend to two first side plates respectively. The lowest point of the contact between one side of the arc surface and the first side plate is A1, and the lowest point of the contact between the other side of the arc surface and the first side plate is A2. The distance from A1 to the bottom plate is L1, and the distance from A2 to the bottom plate is L2, and L1 is equal to L2.

[0010] As a preferred embodiment, the distance from the midpoint of the arc surface to the bottom plate is L3, and L3 is less than L1 and L2.

[0011] As a preferred embodiment, reinforcing ribs are respectively arranged on the outer sides of the two second side plates.

[0012] Another object of the present disclosure is to provide a lead-acid battery, including a battery cover and the above-mentioned battery cell. The battery cover is arranged at the opening of the battery cell, and the battery cover is connected to the battery cell through epoxy resin.

[0013] As a preferred embodiment, pole groups are respectively arranged in the first single cell and the second single cell, and adjacent pole groups are connected in series through a bus bar.

[0014] As a preferred embodiment, the pole group includes a second separator and a plurality of alternately arranged positive plates and negative plates. The second separator is used to separate the positive plates and the negative plates. The positive plate includes a positive grid and a positive active material coated on the positive grid. The negative plate 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 pole ear, and the other side is provided with a first arc structure. Vertical ribs and a plurality of arc ribs are arranged 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 the bending direction of the arc ribs. The second separator is provided with a second arc structure, and the second arc structure is adapted to the first arc structure. The side of the positive plate or the negative plate provided with the first arc structure is located in the second separator.

[0015] As a preferred embodiment, the second 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 provided with the first arc edge and the side of the second plate body provided with the second arc edge.

[0016] 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.

[0017] As a preferred embodiment, the distance between adjacent two arc ribs decreases sequentially from the pole ear end to the first arc structure end.

[0018] Compared with existing products, during the charge and discharge process of the battery, as the active substances react, the electrode groups in the first cell and the second cell will both expand. The volumes of the first cell and the second cell will increase to varying degrees as the electrode groups expand. The second cell is located between two first cells, and the expansion of the volume of the second cell is restricted by the first cells. Therefore, the degree of increase in the volume of the first cell is much greater than that of the second cell. In this application, since the volume of the first cell is smaller than that of the second cell, the gap in the volumes after expansion between the first cell and the second cell can be reduced, making the volumes of the first cell and the second cell more consistent during the charge and discharge process of the battery. Thus, the consistency of the utilization rate of the electrode groups in each cell of the battery is improved, and the positive plate grid corrosion and the sludging of active substances caused by the increase in the acid content in the first cell are avoided, thereby preventing the premature failure of the electrode group in the first cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following will further describe the present application in detail with reference to the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be regarded 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.

[0020] Figure 1 is one of the schematic structural diagrams of a battery case of the present disclosure;

[0021] Figure 2 is another schematic structural diagram of a battery case of the present disclosure;

[0022] Figure 3 is the schematic structural diagram of the first cell of the present disclosure;

[0023] Figure 4 is the cross-sectional view of the first cell of the present disclosure;

[0024] Figure 5 is the schematic structural diagram of the electrode group of the present disclosure;

[0025] Figure 6 is the schematic structural diagram of the second separator of the present disclosure;

[0026] Figure 7 is the schematic structural diagram of the positive plate grid (negative plate grid) of the present disclosure;

[0027] Figure 8 is the schematic structural diagram of a lead-acid battery of the present disclosure.

[0028] Description of the reference numerals:

[0029] 1. Cell body; 2. First partition; 3. First single cell; 4. Second single cell; 5. First side plate; 6. Second side plate; 7. Battery cover; 8. Arc surface; 9. Tab; 10. Second partition; 11. Vertical rib; 12. Arc rib; 13. Positive plate; 14. Negative plate; 15. First plate body; 16. Second plate body; 17. Second arc structure; 18. Frame; 19. First arc structure. Detailed implementation manners

[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 in conjunction with 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 relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are 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 2 As shown, the present disclosure provides a battery cell, including a cell body 1 with a cuboid structure and a plurality of first partitions 2 arranged in the cell body 1. The first partitions 2 divide the cell body 1 into a plurality of single cells. The single cells include two first single cells 3 and a plurality of second single cells 4. The two first single cells 3 are respectively located at both ends of the cell body 1, and the plurality of second single cells 4 are located between the two first single cells 3. The volume of the first single cell 3 is smaller than that of the second single cell 4. During the charging and discharging process of the battery, with the reaction of the active substances, the electrode groups in the first single cell 3 and the second single cell 4 will both expand. The volumes of the first single cell 3 and the second single cell 4 will increase to varying degrees with the expansion of the electrode groups. Since the second single cell 4 is located between the two first single cells 3, the expansion of the volume of the second single cell 4 is restricted by the first single cell 3. Therefore, the degree of increase in the volume of the first single cell 3 is much greater than that of the second single cell 4. This will cause the acid content in the first single cell 3 to increase. In this application, since the volume of the first single cell 3 is smaller than that of the second single cell 4, the gap in the volumes after expansion between the first single cell 3 and the second single cell 4 can be reduced, making the volumes of the first single cell 3 and the second single cell 4 more consistent during the charging and discharging process of the battery. Thus, the consistency of the utilization rate of the electrode groups in each single cell of the battery is improved, and the corrosion of the positive grid and the sludging of the active substances caused by the increase in the acid content in the first single cell 3 are avoided, thereby preventing the premature failure of the electrode group in the first single cell 3.

[0033] Specifically, each of the second single cells 4 has the same volume, and the two first single cells 3 have the same volume. During the expansion of the electrode group, the volumes of the first single cells 3 and the second single cells 4 will increase to varying degrees as the electrode group expands. The second single cells 4 are located between the two first single cells 3. When the second single cells 4 expand, they will generate a force to squeeze the two first single cells 3 on both sides, making the volumes of the two first single cells 3 equal, so that the first single cells 3 at both ends have the same resistance ability when being squeezed, avoiding serious deformation of one of the first single cells 3 due to being squeezed, which may affect the electrical performance of the battery. Preferably, the volume of a single first single cell 3 is 3 - 5 mL smaller than the volume of a single second single cell 4. This volume difference can effectively reduce the volume gap between the first single cells 3 and the second single cells 4 after expansion, making the volumes of the first single cells 3 and the second single cells 4 more consistent during the charge and discharge process of the battery, thereby improving the consistency of the utilization rate of the electrode groups in each single cell of the battery. It should be noted that since the first single cells 3 and the second single cells 4 are in the same cell body, the heights and lengths of the first single cells 3 and the second single cells 4 are equal. By changing the width of the first single cells 3 to change their volumes, the width of the first single cells 3 is determined by the distance between the outermost first separator 2 and the second side plate 6. Therefore, the numerical range that the volume of the first single cells 3 is 3 - 5 mL smaller than the volume of the second single cells 4 is obtained by adjusting the distance between the first separator 2 and the second side plate 6.

[0034] Please refer to Figure 3 and Figure 4 As shown, in an embodiment of the present disclosure, the cell body 1 includes two parallel first side plates 5, two parallel second side plates 6 and a bottom plate. Both ends of the first separator 2 are respectively arranged on the two first side plates 5, and the first separator 2 is arranged parallel to the second side plates 6. The bottoms of the first single cells 3 and the second single cells 4 are arc-shaped surfaces 8; the first side plates 5, the second side plates 6 and the bottom plate are all flat surfaces. Both sides of the arc-shaped surface 8 extend to the two first side plates 5 respectively. The lowest point of the contact between one side of the arc-shaped surface 8 and the first side plate 5 is A1, and the lowest point of the contact between the other side of the arc-shaped surface 8 and the first side plate 5 is A2. The distance from A1 to the bottom plate is L1, the distance from A2 to the bottom plate is L2, and the distance from the midpoint of the arc-shaped surface 8 to the bottom plate is L3. L1 is equal to L2, and L3 is less than L1 and L2. The structure between the arc-shaped surface 8 and the bottom plate is solid. Such a setting increases the thickness between the bottom of the cell body 1 and the bottom plate, strengthens the structural strength of the bottom of the battery cell and the protection effect on the electrode group, and can effectively reduce the vibration damage caused to the electrode group by the bumps during the driving of the electric vehicle.

[0035] To strengthen the structural strength of the side of the cell body 1 and further limit the deformation degree of the first single cells 3, reinforcing ribs are respectively arranged on the outer sides of the two second side plates 6. The reinforcing ribs include horizontally and vertically crisscrossed horizontal reinforcing ribs and vertical reinforcing ribs.

[0036] AsFigure 8 As shown in Figure 8 , another embodiment of the present disclosure provides a lead-acid battery, which includes a battery cover 7 and the above-mentioned battery cell. The battery cover 7 is arranged at the opening of the battery cell, and the battery cover 7 is connected to the battery cell through epoxy resin. The first cell 3 and the second cell 4 are respectively provided with electrode groups, and adjacent electrode groups are connected in series through a bus bar.

[0037] Please refer to Figures 5 to 7 As shown in Figures 5 to 7 , specifically, the electrode group includes a second separator 10 and a plurality of alternately arranged positive plates 13 and negative plates 14. The second separator 10 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 18. One side of the frame 18 is provided with a tab 9, and the other side is provided with a first arc structure 19. Vertical ribs 11 and a plurality of arc ribs 12 are arranged on the frame 18. The vertical ribs 11 extend from the tab 9 to the first arc structure 19. The arc ribs 12 are horizontally arranged on the frame 18. The bending direction of the first arc structure 19 is the same as that of the arc ribs 12. The second separator 10 is provided with a second arc structure 17, and the second arc structure 17 is adapted to the first arc structure 19. The side of the positive plate 13 or the negative plate 14 provided with the first arc structure 19 is located in the second separator 10. The second arc structure 17 is adapted to the first arc structure 19, so that the bottom of the positive plate 13 or the negative plate 14 can be better attached to the bottom of the second separator 10, thereby enabling the electrical performance of the electrode group to be better exerted. The function of the second separator 10 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 - second separator 10 - positive plate 13 - second separator 10 - negative plate 14 - second separator 10 - positive plate 13... or positive plate 13 - second separator 10 - negative plate 14 - second separator 10 - positive plate 13 - second separator 10 - negative plate 14... to prevent the positive plates 13 and the negative plates 14 from contacting and causing a short circuit. The present disclosure will be described with the arrangement order of negative plate 14 - second separator 10 - positive plate 13 - second separator 10 - negative plate 14 - second separator 10 - positive plate 13... (that is, the positive plates 13 are arranged in the second separator). The arc surfaces 8 at the bottoms of the first cell 3 and the second cell 4 are adapted to the first arc structure 19 and the second arc structure 17. After the electrode group is placed in the first cell 3 and the second cell 4, the bottom of the electrode group is attached to the arc surface 8, providing a uniform supporting force for each point at the bottom of the electrode group.

[0038] 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 19 should be provided on the side of the negative grid frame 18 away from the tab 9. Except for this, the other structures of the negative grid are the same as those in the prior art); it is also possible to make the negative grid adopt the above structure and the positive grid adopt the structure in the prior art (in order to facilitate subsequent assembly, an arc structure consistent with the first arc structure 19 should be provided on the side of the positive grid frame 18 away from the tab 9. 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, the corrosion of the positive grid can be delayed, and thus the battery life can be further extended. In this embodiment, although the positive grid of the positive plate 13 and the negative grid of the negative 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 plate 13 will be slightly thicker than the negative grid of the negative 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 plate 13, and the negative active material is uniformly coated on both sides of the negative grid by extrusion to form the negative plate 14. The specific operation process is the prior art and will not be elaborated in detail in this application. The second separator 10 is made of glass fiber and has a porous structure, so that the electrolyte can pass through the second separator 10.

[0039] Furthermore, the second separator 10 includes a first plate body 15 and a second plate body 16 arranged in parallel. The height and width of the first plate body 15 and the second plate body 16 are the same. A first arc edge is provided on one side of the first plate body 15, and a second arc edge is provided on one side of the second plate body 16. The second arc structure 17 is formed by connecting the side of the first plate body 15 provided with the first arc edge and the side of the second plate body 16 provided with the second arc edge. The positive plate 13 is arranged between the first plate body 15 and the second plate body 16. After the positive plate 13 is placed in the second separator 10, the bottom of the positive plate 13 is attached to the bottom of the second separator 10. Preferably, after the positive plate 13 is placed in the second separator 10, the first plate body 15 and the second plate body 16 are 2-3 mm higher than the positive plate 13, and the two sides of the first plate body 15 and the second plate body 16 are 2-3 mm wider than the positive plate 13. Such a setting is to completely cover the positive plate 13 with the second separator 10 and prevent the left and right sides or the upper side of the positive plate 13 from exceeding the first plate body 15 and the second plate body 16 and contacting the negative plate 14, resulting in a short circuit.

[0040] On the positive electrode plate 13 or the negative electrode plate 14, during the process of current conduction from the tab 9 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 and the consistency of the utilization rate of the active material of the upper and lower parts, the distance between two adjacent arc-shaped ribs 12 in the present disclosure gradually decreases from the tab 9 end to the first arc-shaped structure 19 end. By reducing the distance between the arc-shaped ribs 12 on the positive grid and the negative grid, the current density acting on the unit area is made the same. Coupled with the action of the equipotential surface, the consistency of the utilization rate of the active material of the upper and lower parts of the positive electrode plate 13 or the negative electrode plate 14 is further improved.

[0041] 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 battery container, characterized in that: The invention comprises a tank body (1) and a plurality of first partitions (2) arranged in the tank body (1), wherein the first partitions (2) divide the tank body (1) into a plurality of cells, wherein the cells comprise two first cells (3) and a plurality of second cells (4), wherein the two first cells (3) are respectively located at two ends of the tank body (1), and the plurality of second cells (4) are located between the two first cells (3), and the volume of the first cells (3) is smaller than the volume of the second cells (4).

2. The battery container according to claim 1, characterized in that: The volumes of the two first cells (3) are equal; the volume of the first cell (3) is 3 to 5 mL smaller than the volume of the second cell (4).

3. The battery container according to claim 1, characterized in that: The trough body (1) comprises two mutually parallel first side plates (5), two mutually parallel second side plates (6) and a bottom plate; the two ends of the first partition plate (2) are respectively arranged on the two first side plates (5); the first partition plate (2) and the second side plates (6) are arranged in parallel; the bottoms of the first cell (3) and the second cell (4) are arc-shaped surfaces (8); and the first side plates (5), the second side plates (6) and the bottom plate are all flat surfaces.

4. The battery container according to claim 3, characterized in that: Both sides of the arc surface (8) extend to the two first side plates (5) respectively; the lowest point where one side of the arc surface (8) contacts the first side plate (5) is A1; the lowest point where the other side of the arc surface (8) contacts the first side plate (5) is A2; the distance between A1 and the bottom plate is L1; the distance between A2 and the bottom plate is L2; ​​and L1 is equal to L2.

5. The battery container according to claim 4, characterized in that: The distance between the midpoint of the arc-shaped surface (8) and the bottom plate is L3, and L3 is smaller than L1 and L2.

6. A lead-acid battery, characterized in that: It comprises a battery cover (7) and a battery slot as claimed in any one of claims 1 to 5, wherein the battery cover (7) is arranged at the opening of the battery slot, and the battery cover (7) is connected to the battery slot by epoxy resin.

7. The lead acid battery according to claim 6, characterized in that: The first single cell (3) and the second single cell (4) are respectively provided with pole groups, and adjacent pole groups are connected in series via a bus bar.

8. The lead acid battery according to claim 7, characterized in that: The electrode group comprises a second separator (10) and a plurality of alternately arranged positive plates (13) and negative plates (14); the second separator (10) is used to separate the positive plate (13) from the negative plate (14); the positive plate (13) comprises a positive grid and a positive active material coated on the positive grid; the negative plate (14) comprises a negative grid and a negative active material coated on the negative grid; the positive grid and / or the negative grid comprises a frame (18); one side of the frame (18) is provided with a pole ear (9) and the other side is provided with a first arc-shaped structure (19); the frame (18) A vertical rib (11) and a plurality of arc-shaped ribs (12) are arranged on the frame (18), wherein the vertical rib (11) extends from the pole ear (9) to the first arc-shaped structure (19), the arc-shaped rib (12) is arranged transversely on the frame (18), the bending direction of the first arc-shaped structure (19) is consistent with the bending direction of the arc-shaped rib (12), the second separator (10) is provided with a second arc-shaped structure (17), the second arc-shaped structure (17) is adapted to the first arc-shaped structure (19), and the side of the positive plate (13) or the negative plate (14) provided with the first arc-shaped structure (19) is located in the second separator (10).

9. The lead-acid battery according to claim 8, characterized in that: The second partition plate (10) comprises a first plate body (15) and a second plate body (16) which are arranged in parallel, wherein a first arc-shaped edge is arranged on one side of the first plate body (15), and a second arc-shaped edge is arranged on one side of the second plate body (16), and the second arc-shaped structure (17) is formed by connecting a side of the first plate body (15) on which the first arc-shaped edge is arranged and a side of the second plate body (16) on which the second arc-shaped edge is arranged.

10. The lead acid battery according to claim 8, characterized in that: The distance between two adjacent arc-shaped ribs (12) decreases in sequence from the end of the pole ear (9) to the end of the first arc-shaped structure (19).

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