Lead storage battery for electric two-wheeled vehicle

Abstract

The utility model provides a lead storage battery for an electric two-wheeled vehicle. The lead storage battery is characterized by comprising a battery shell; a plurality of single-cell accommodating cavities are formed in the battery shell; a plate group is arranged in each single-cell accommodating cavity; the battery cover can be used for sealing the single-cell accommodating cavity; the battery cover is arranged at the upper end of the battery shell; a direct connection type busbar; the direct connection type busbars are respectively connected with the two adjacent pole groups; the battery box has the advantages that the limitation requirement of an existing electric two-wheeled vehicle battery box on the battery installation size during different voltage combinations can be met by improving the appearance size of the battery, and meanwhile the cycle life index of the battery is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a lead-acid battery for an electric two-wheeled vehicle. Background Art

[0002] Lead-acid batteries for electric two-wheeled vehicles are a type of power battery. In the prior art, the dimensions of lead-acid batteries for electric two-wheeled vehicles are length × width × height = 181 × 77 × 170 (± 2) mm, which are typical tall power batteries. A single finished battery weighs approximately 6.6 kg, but its 2-hour rate capacity is only approximately 22.5 Ah, and its 2-hour rate weight energy is only approximately 40.91 Wh / kg. The actual vehicle service life does not exceed two years, resulting in low overall economic benefits and an urgent need for improvement. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the embodiment of the present application provides a lead-acid battery for an electric two-wheeled vehicle to solve the problems existing in the related technology. The technical solution is as follows:

[0004] An embodiment of the present application provides a lead-acid battery for an electric two-wheeled vehicle, comprising: a battery case; a plurality of single-cell accommodating cavities within the battery case; a pole group disposed within each of the single-cell accommodating cavities; a battery cover capable of enclosing the single-cell accommodating cavities; the battery cover disposed at the upper end of the battery case; and a direct-connect bus bar; the direct-connect bus bar respectively connecting two adjacent pole groups.

[0005] In one embodiment, the lead-acid battery for an electric two-wheeled vehicle has an overall length of 184 mm, an overall width of 121 mm, and an overall height of 86 mm.

[0006] In one embodiment, the electrode group includes: a plurality of positive electrode plates and a plurality of negative electrode plates; the plurality of positive electrode plates and the plurality of negative electrode plates are alternately arranged in the single cell accommodating cavity; the direct-connected busbars are respectively connected to the positive electrode plates and the negative electrode plates.

[0007] In one embodiment, the number of positive electrode plates provided in the electrode group is 6; the number of negative electrode plates provided in the electrode group is 7.

[0008] In one embodiment, the electrode group further includes a plurality of AGM separators; the plurality of AGM separators are alternately arranged between the positive electrode plates and the negative electrode plates.

[0009] In one embodiment, the electrode group further includes: a grid; the grid is an ultra-short fishbone-shaped punched mesh grid; the ultra-short fishbone-shaped punched mesh grid respectively constitutes an active material current collector corresponding to the positive electrode plate and the negative electrode plate.

[0010] In one embodiment, plate ears are provided on the upper ends of the positive plate and the negative plate; the plate ears are connected to the direct-connected busbar; and the width of the plate ears is 7 mm.

[0011] In one embodiment, the cross-sectional shape of the direct-connect busbar is an isosceles trapezoid; the cross-sectional area of ​​the direct-connect busbar is 0.3 cm 2 .

[0012] In one embodiment, position-limiting support blocks are symmetrically provided on both sides of the bottom of the battery shell; the position-limiting support blocks abut against the electrode groups.

[0013] In one embodiment, a guide slope is provided at the upper end of the position-limiting support block; the inclination angle of the guide slope is 30°.

[0014] The advantages or beneficial effects of the above technical solution include at least:

[0015] The lead-acid battery for electric two-wheeled vehicles of the present application adopts a brand-new structural size. Compared with the current battery of the same model, the weight-to-energy ratio of the battery of the present application is increased by 5.12%, and the volume-to-energy ratio is increased by 34.93%. At the same time, due to the battery weight reduction, the riding distance of the electric two-wheeled vehicle can be extended. The battery can be configured in three different arrangements and combinations to produce battery packs with voltages of 48V, 60V and 72V respectively. Under the premise of meeting the current internal installation size requirements of the battery box, the new and old batteries can be interchanged without obstacles.

[0016] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0018] Figure 1 It is a structural diagram of the battery shell and battery cover in the utility model;

[0019] Figure 2 It is a side view schematic diagram of the internal structure of the utility model;

[0020] Figure 3 yes Figure 2 A partial enlarged schematic diagram;

[0021] Figure 4 This is a schematic structural diagram of the pole group in the utility model;

[0022] Figure 5 This is a schematic diagram of the arrangement of the direct-connect busbars in the present utility model;

[0023] Figure 6 It is a planar schematic diagram of the grid in the utility model;

[0024] Figure 7 This is a top view of the 48V battery arrangement in the present invention;

[0025] Figure 8 This is a top view of the 60V battery arrangement in the present invention;

[0026] Figure 9 It is a top view schematic diagram of the arrangement of 72V batteries in the present invention.

[0027] In the figure: 1. Battery shell; 2. Single cell accommodating cavity; 3. Electrode group; 4. Battery cover; 5. Direct-connect busbar; 6. AGM separator; 7. Plate ear; 8. Limit support block. DETAILED DESCRIPTION

[0028] In the following, only certain exemplary embodiments are briefly described to make the objects, features, and advantages of the present invention more readily apparent. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 9 As shown, this embodiment provides a lead-acid battery for an electric two-wheeled vehicle, comprising: a battery case 1; a plurality of single-cell accommodating cavities 2 in the battery case 1; a pole group 3 is provided in each of the single-cell accommodating cavities 2; a battery cover 4 for sealing the single-cell accommodating cavities; the battery cover 4 is provided at the upper end of the battery case 1; a direct-connect bus bar 5; the direct-connect bus bar 5 respectively connects two adjacent pole groups 3.

[0031] The battery shell 1 and the battery cover 4 together constitute the external structure of the battery (the structure and working principle of the battery shell 1 and the battery cover 4 refer to the Chinese utility model patent application number 201921430090.2); in this embodiment, there are six single-cell accommodating cavities 2 in the battery shell 1, and a pole group 3 is provided in each single-cell accommodating cavity 2. The two adjacent pole groups 3 are connected by a direct-connected bus 5 and the positive and negative output terminals are directly formed on the bus (the connection relationship between the direct-connected bus 5 and the pole group 3 is the prior art, and the top view of the distribution of the direct-connected bus 5 can be seen in Figure 5 ), the number of plates in a single cell accommodating cavity 2 is significantly increased, the plate area is significantly increased, and after the total height of the battery is halved, the consistency of the upper and lower assembly pressures within the electrode group 3 is significantly converged, so that the cycle life of the improved lead-acid battery will be increased by at least 30%, thereby achieving a service life of three years for this type of battery, significantly reducing production costs for manufacturers and reducing usage costs for end users;

[0032] In addition, the battery consists of six electrode groups 3 connected in series to form a 12V lead-acid battery structure; the battery boxes currently equipped with electric two-wheelers are of three specifications: 48V, 60V, and 72V. The lead-acid batteries of this application can be placed in the battery boxes of the above three specifications in the form of 4 (12V×4=48V), 5 (12V×5=60V), and 6 (12V×6=72V).

[0033] When the lead-acid battery of the present application is placed on the battery box of an electric vehicle, the battery has two combined placement modes: sideways (bottom perpendicular to the ground) and stacked / flat (bottom parallel to the ground), wherein:

[0034] ① Figure 7 This is a top view of the 48V battery arrangement, with four batteries stacked horizontally in two rows and two columns in the battery box;

[0035] ② Figure 8 This is a top view of the 60V battery arrangement, with five batteries placed in the battery box with two stacked and three on their sides;

[0036] ③ Figure 9 This is a top view of the 72V battery arrangement. The six batteries are placed in the battery box in a stacked arrangement of four (two rows and two columns) and two on their sides.

[0037] Different numbers (4 / 5 / 6) of lead-acid batteries can be combined in the above two placement methods and can be installed in battery boxes of three specifications: 48V, 60V and 72V, meeting the internal installation size requirements of current battery boxes, thereby realizing barrier-free interchange of new and old batteries.

[0038] Further, the overall length dimension of the lead storage battery for electric two-wheeled vehicles is 184 mm; the overall width dimension is 121 mm; and the overall height dimension is 86 mm.

[0039] The current battery (12V23AH) has an outer dimension of: length x width x height = 181 x 77 x 170 mm. In the present embodiment, the battery height dimension is reduced to 50% of the height dimension of the existing battery (the height dimension of the existing battery is 170 mm, and the height dimension of the battery of the present application is 86 mm) without changing the length dimension of the battery. The installation dimension limit in the height direction is satisfied by vertically stacking the batteries, and the capacity requirement of the battery is satisfied by calculating and selecting the width dimension of the battery.

[0040] The maximum outer dimension of the lead storage battery for electric two-wheeled vehicles of the present application is designed to be length x width x height = 184 x 121 x 86 mm. The 2-hour rate capacity of the lead storage battery for electric two-wheeled vehicles under this structure dimension design can reach 23.4 Ah, and the finished battery weight is only 6.1 kg (the finished battery weight of the current battery is 6.6 kg). While significantly reducing the production cost of this type of battery (the overall cost reduction is ≥ 9 yuan per unit), the 2-hour rate weight specific energy jumps to 46.03 Wh / kg, and the volume specific energy increases significantly to 146.26 Wh / L, which brings obvious economic benefits to the enterprise production.

[0041] Further, the positive plate group 3 includes a plurality of positive plates and a plurality of negative plates, the plurality of positive plates and the plurality of negative plates are alternately and spaced apart arranged in the single-cell accommodating cavity 2, and the direct connection busbar 5 is connected to the positive plates and the negative plates. The number of positive plates arranged in the positive plate group 3 is 6, and the number of negative plates arranged in the positive plate group 3 is 7.

[0042] The current battery plate has a dimension of: width x height x thickness = 66 x 142 x 2.7 / 1.7 mm (the number after the slash represents the thickness of the negative plate, the same below) or width x height x thickness = 67 x 143 x 2.4 / 1.6 mm, the plate height-width ratio is 2.15 / 1 or 2.13 / 1, the number of plates in a single cell is 4 positive and 5 negative, and the surface area of a single positive plate is 749.76 cm 2 or 766.48 cm 2 ;

[0043] In the present embodiment, the positive plate group 3 is arranged in each single-cell accommodating cavity 2, the positive plate group 3 is composed of six positive plates and seven negative plates, the dimension of the plate is: width x height x thickness = 110 x 64 x 1.7 / 1.3 mm, the plate height-width ratio is 0.58 / 1, and the surface area of a single positive plate is 844.80 cm 2By comparing with the existing battery plates, it can be seen that the surface area of ​​the single-cell positive plate of the present application is increased by more than 10% compared with the existing design. Based on the inverse relationship between the resistance of the material and its cross-sectional area, when the battery is discharged with the same current, the overall internal resistance of the plate of the present application will also decrease by 10%, and the voltage drop of the battery will also be reduced simultaneously, thereby extending the discharge time;

[0044] In addition, the thickness of the positive and negative plates used in the newly designed battery is only 62.96% to 70.83% and 76.47% to 81.25% of the thickness of the positive and negative plates used in the current structure battery. The significant reduction in plate thickness significantly improves the utilization rate of the plate active material, which helps to reduce the battery weight without reducing capacity. After the significant increase in plate area and the halving of the total height of the battery, the consistency of the upper and lower assembly pressures within the electrode group 3 is significantly consistent, which means that the cycle life of the improved lead-acid battery will be increased by at least 30%, thereby achieving a three-year service life for this type of battery, significantly reducing production costs for manufacturers and reducing usage costs for end users.

[0045] Furthermore, the electrode group 3 further includes a plurality of AGM separators 6, which are alternately spaced between the positive and negative electrode plates. The electrode group further includes a grid, which is an ultra-short fishbone-shaped punched mesh grid. The ultra-short fishbone-shaped punched mesh grid constitutes the active material current collector corresponding to the positive and negative electrode plates.

[0046] In this embodiment, AGM separators 6 are alternately arranged between each positive electrode plate and each negative electrode plate in the electrode group 3. The AGM separators 6 are conventional technical means used by those skilled in the art and will not be described in detail here. The grids in the electrode group include positive electrode grids and negative electrode grids. The positive electrode grids constitute the positive electrode active material collectors corresponding to the positive electrode plates, and the negative electrode grids constitute the negative electrode active material collectors corresponding to the negative electrode plates.

[0047] The current battery's punched mesh grid rib structure is still a vertical and horizontal structure, while the grid design of this application adopts an ultra-short fishbone-shaped punched mesh grid. The main vertical ribs are provided in the middle position of the ultra-short fishbone-shaped punched mesh grid, which significantly reduces the internal resistance of the battery collector. Compared with the current high-type grid with vertical and horizontal structural ribs, the total cross-sectional area of ​​the vertical ribs that play a role in current transmission during the battery charging and discharging process is 10 times that of the latter, thereby making this type of grid have lower internal resistance and stronger current transmission capacity, which is more conducive to battery charging and discharging, and improves the battery's large current discharge capacity.

[0048] Furthermore, plate ears 7 are provided at the upper ends of the positive plate and the negative plate; the plate ears 7 are connected to the direct-connection busbar 5; and the width of the plate ears 7 is 7 mm.

[0049] In order to reduce the material cost of the battery as much as possible, the current structure battery manufacturers set the width of the grid plate ear to 6mm, and the cross-sectional area of ​​the busbar is only 0.224cm 2 ;In this embodiment, the width of the plate ear 7 on the newly designed battery plate is 7mm, and the design of the ultra-short fishbone-shaped rib grid and the increased cross-sectional area of ​​the plate ear, bus bar and output terminal pole significantly reduces the internal resistance of the battery collector and the bus bar, improves the battery's large current discharge capability, reduces the voltage drop loss on the electrode, and makes the utilization rate of the active materials on the upper and lower layers of the plate tend to be consistent.

[0050] Furthermore, the cross-sectional shape of the direct-connection busbar 5 is an isosceles trapezoid; the cross-sectional area of ​​the direct-connection busbar 5 is 0.3 cm 2 .

[0051] In this embodiment, the cross-sectional shape of the direct-connect busbar is an isosceles trapezoid, and the cross-sectional area of ​​the direct-connect busbar 5 is 0.3 cm 2 This application is 33.9% higher than the current design, which is more conducive to reducing the internal resistance of the battery. When the battery is discharged with the same current, the discharge time will be extended, and it will also be beneficial to improve the battery's charge acceptance capacity.

[0052] Furthermore, limiting support blocks 8 are symmetrically provided on both sides of the bottom of the battery shell 1 ; the limiting support blocks 8 abut against the electrode groups 3 .

[0053] In order to prevent the electrode group 3 in the single cell accommodating cavity 2 from being frequently shaken up and down during driving when the battery is placed on its side on the vehicle, which may cause the plate ears 7 to bend and break due to lack of support at the bottom of the electrode group 3, and eventually lead to problems such as electrode group short circuit or open circuit, in this embodiment, two limiting support blocks 8 are symmetrically provided on both sides of the bottom of the battery shell 1. The limiting support blocks 8 are arranged on both sides of the bottom of all single cell accommodating cavities 2 (see Figure 2 and Figure 3 ), the two sides of the lower end of the pole group 3 are respectively pressed against the inner sides of the two corresponding limit support blocks 8, thereby eliminating the left and right displacement of the pole group 3 when the battery is placed on its side, and providing sufficient support and limiting effect, thereby preventing the pole group from short-circuiting or breaking due to the bending and breaking of the plate ear 7.

[0054] Furthermore, a guiding slope is provided at the upper end of the position-limiting support block 8; the inclination angle of the guiding slope is 30°.

[0055] In this embodiment, the upper ends of the two limiting support blocks 8 are each provided with a guiding slope with an inclination angle of 30°. When the electrode group 3 is loaded into the single-cell accommodating cavity 2, the electrode group 3 can be pressed against the limiting support block 8 along the 30° guiding angle. Under the action of the guiding slope, the positive and negative plates inside the electrode group are fixed and supported by forcibly compressing the AGM separator of the electrode group 3 at that location, thereby eliminating the left and right displacement of the electrode group 3 when the battery is placed on its side and providing sufficient support and limiting effect, thereby preventing the electrode group from short-circuiting or breaking due to bending and breaking of the plate ears 7.

[0056] The utility model provides a lead-acid battery for an electric two-wheeled vehicle. The functions of the various modules in the various devices in the embodiments can be referred to the corresponding descriptions in the above-mentioned method. The utility model has the advantage of being able to meet the restrictive requirements of the current electric two-wheeled vehicle battery box on the battery installation size when different voltage combinations are required by improving the battery's external dimensions, while significantly improving the battery cycle life index.

[0057] In the description of this specification, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0058] In the present invention, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A lead-acid battery for an electric two-wheeled vehicle, characterized in that: include: A battery case; a plurality of single-cell accommodating cavities are provided in the battery case; a pole group is provided in each of the single-cell accommodating cavities; A battery cover, capable of closing the single cell accommodating cavity; the battery cover is arranged at the upper end of the battery shell; A direct-connect busbar; the direct-connect busbar is respectively connected to two adjacent pole groups.

2. The lead-acid battery for an electric two-wheeled vehicle according to claim 1, wherein The overall length dimension of the lead-acid battery for an electric two-wheeled vehicle is 184 mm; the overall width dimension is 121 mm; and the overall height dimension is 86 mm.

3. The lead-acid battery for an electric two-wheeled vehicle according to claim 1, wherein The electrode group includes: a plurality of positive plates and a plurality of negative plates; the plurality of positive plates and the plurality of negative plates are alternately arranged in the single cell accommodating cavity; the direct-connected busbars are respectively connected to the positive plates and the negative plates.

4. The lead-acid battery for an electric two-wheeled vehicle according to claim 3, characterized in that The number of positive electrode plates arranged in the electrode group is 6; the number of negative electrode plates arranged in the electrode group is 7.

5. The lead-acid battery for an electric two-wheeled vehicle according to claim 3, wherein The electrode group further includes a plurality of AGM separators; the plurality of AGM separators are alternately arranged between the positive electrode plate and the negative electrode plate.

6. The lead-acid battery for an electric two-wheeled vehicle according to claim 5, characterized in that The electrode group further includes: a grid; the grid is an ultra-short fishbone-shaped punched mesh grid; the ultra-short fishbone-shaped punched mesh grid respectively constitutes an active material current collector corresponding to the positive electrode plate and the negative electrode plate.

7. The lead-acid battery for an electric two-wheeled vehicle according to claim 6, characterized in that Plate ears are provided at the upper ends of the positive plate and the negative plate; the plate ears are connected to the direct-connected busbar; and the width of the plate ears is 7 mm.

8. The lead-acid battery for an electric two-wheeled vehicle according to any one of claims 1 to 7, characterized in that: The cross-sectional shape of the direct-connect busbar is an isosceles trapezoid; the cross-sectional area of ​​the direct-connect busbar is 0.3 cm 2 .

9. The lead-acid battery for an electric two-wheeled vehicle according to any one of claims 1 to 7, characterized in that: Limiting support blocks are symmetrically arranged on both sides of the bottom of the battery shell; the limiting support blocks abut against the electrode groups.

10. The lead-acid battery for an electric two-wheeled vehicle according to claim 9, characterized in that A guide slope is provided at the upper end of the position-limiting support block; the inclination angle of the guide slope is 30°.

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