A pole group and a manufacturing method thereof

Abstract

The present invention discloses a pole group, comprising a trough body with a demoulding angle, wherein a plurality of positive plates and a plurality of negative plates are arranged in the trough body, the plurality of positive plates and the plurality of negative plates are arranged in a staggered manner, the positive plates are coated with separators, the upper opening width of the trough body is greater than the lower opening width, active layers are coated on both sides of the positive plates and the negative plates, the upper end of the active layer is thicker than the lower end so that the pressure at the upper opening and the lower opening of the trough body are equal, and the present invention adjusts the assembly pressure of the upper and lower parts of the pole group to be balanced, so that when the electrolyte is added, it flows evenly into the bottom of the battery, the active material is completely converted during the formation conversion, the electrolyte density of the upper and lower parts is balanced, the discharge capacity and the cycle durability are improved, and the thickness of the single-side active layer coating of the pole plates of the pole groups with different specifications can be calculated separately through formulas, thereby improving the application range of the pole group manufacturing method.

Description

Technical Field

[0001] The present invention relates to the technical field of storage batteries, and in particular to a pole group and a manufacturing method thereof. Background Art

[0002] The valve-regulated lead-acid battery tank is made of ABS (acrylonitrile-butadiene-styrene copolymer) material by injection molding to form a lattice-shaped battery tank. Each battery tank consists of several single cells. The electrode group is loaded into the single cell, and the electrolyte is added. After direct current electrification, it becomes a finished battery. In order to facilitate demoulding during the injection molding process, the single cell tank of the battery has a certain demoulding angle on the tank wall, resulting in a single cell with a large upper opening and a small lower opening.

[0003] The pole group of valve-regulated lead-acid battery is composed of positive plate, separator and negative plate. Because valve-regulated lead-acid battery is a lean battery without flowing electrolyte, the separator is always kept under pressure, normally 40-65kPA, which leads to different pressures at the top and bottom when the pole group is assembled into a single cell of the battery slot, with small pressure at the top and large pressure at the bottom. When electrolyte is added to the battery, it is more difficult to penetrate to the bottom of the pole group, resulting in stratification of electrolyte density after formation (uneven top and bottom), which affects the service life of the battery. In addition, the utilization rate of active materials far away from the pole ears is relatively low, and the electrolyte stratification further affects the service life of the battery. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an electrode group and a manufacturing method thereof. By setting active layers of unequal thickness, the assembly pressure of the upper and lower parts of the electrode group can be adjusted to be balanced to avoid stratification of the electrolyte.

[0005] Technical solution: The present invention provides an electrode group, including a trough body with a demolding angle, wherein a plurality of positive plates and a plurality of negative plates are arranged in the trough body, the plurality of positive plates and the plurality of negative plates are arranged alternately, the positive plates are coated with partitions, the upper opening width of the trough body is greater than the lower opening width, active layers are coated on both sides of the positive plates and the negative plates, the upper end of the active layer is thicker than the lower end so that the pressure at the upper opening and the lower opening of the trough body are equal.

[0006] Furthermore, the tabs of the plurality of positive plates and the plurality of negative plates are located outside the tank body.

[0007] Furthermore, the partition is U-shaped and opens upward.

[0008] Furthermore, the demoulding angle of the trough body is 0.12 to 0.16 degrees on one side.

[0009] Furthermore, the inner cavity cross-section of the trough body is an isosceles trapezoid with a larger upper opening and a smaller lower opening.

[0010] Furthermore, the active layer is made of lead paste.

[0011] The present invention also discloses a method for manufacturing a pole group, and the specific steps are as follows:

[0012] Step 1: Injection mold the tank body to ensure that its cross section is an isosceles trapezoid, measure the upper width A and lower width B of the tank body, measure the thickness U of the positive electrode plate and the thickness V of the negative electrode plate, and determine the number M of positive electrode plates and the number N of negative electrode plates installed in the tank body;

[0013] Step 2: Calculate the thickness of the active layer coated on the upper end of the positive plate and the negative plate by the formula {AM*(U+Y)-N*V} / {2*(M+N)}, and calculate the thickness of the active layer coated on the lower end of the positive plate and the negative plate by the formula {BM*(U+Y)-N*V} / {2*(M+N)}, where Y is the sum of the thickness of the two side walls of the separator connected to a single positive plate;

[0014] Step 3: Adjust the angle of the roller of the coating device so that the thickness of the active layer coated on the upper and lower ends of the positive and negative electrode plates are respectively equal to the two values ​​calculated by the above two formulas;

[0015] Step 4: insert the positive electrode plate into the separator, and fix the positive electrode plate and the negative electrode plate in the tank body in an alternating manner so that the pressure at the upper port of the tank body is the same as the pressure at the lower port;

[0016] Step 5: inject electrolyte into the tank body and perform formation operation to complete the manufacturing operation of the battery electrode group.

[0017] Beneficial effects:

[0018] 1. The present invention adjusts the assembly pressure of the upper and lower parts of the electrode group to be balanced. Therefore, when the electrolyte is added, it flows evenly into the bottom of the battery, and the active material is completely converted during the formation conversion, which balances the electrolyte density of the upper and lower parts and improves the discharge capacity and cycle durability.

[0019] 2. The present invention can calculate the thickness of the single-side active layer coating of electrode groups of different specifications through the two formulas {AM*(U+Y)-N*V} / {2*(M+N)} and {BM*(U+Y)-N*V} / {2*(M+N)}, thereby improving the application scope of the electrode group manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a pole group.

[0021] Figure 2 It is a schematic diagram of the tank structure of a pole group.

[0022] Figure 3 A schematic diagram of the active layer coating of a pole group.

[0023] In the figure: 1. Trough body; 2. Negative electrode plate; 3. Positive electrode plate; 4. Separator; 5. Active layer. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0025] Embodiment 1:

[0026] like Figure 1-3 As shown, an electrode group includes a trough body 1 with a demoulding angle, a plurality of positive electrode plates 3 and a plurality of negative electrode plates 2 are arranged in the trough body 1, the plurality of positive electrode plates 3 and the plurality of negative electrode plates 2 are arranged alternately, a separator 4 is coated on the positive electrode plate 3, the upper opening width of the trough body 1 is greater than the lower opening width, active layers 5 are coated on both sides of the positive electrode plates 3 and the negative electrode plates 2, the upper end of the active layer 5 is thicker than the lower end so that the pressure at the upper opening and the lower opening of the trough body 1 are equal, and the tabs of the plurality of positive electrode plates 3 and the plurality of negative electrode plates 2 are located outside the trough body 1.

[0027] After the multiple positive plates 3 and negative plates 2 coated with active layers 5 are combined, the angles on both sides are equal to the demoulding angle of the slot body 1, so that the positive plates 3 and the negative plates 2 are easy to insert into the slot body 1. The partition 4 is U-shaped and opens upward. The positive plate 3 is located inside the partition 4, which can prevent the occurrence of direct short circuit between the positive and negative electrodes.

[0028] The demoulding angle of the trough body 1 is 0.12 to 0.16 degrees on one side, which facilitates the trough body 1 to be separated from the mold.

[0029] The inner cavity cross-section of the tank body 1 is an isosceles trapezoid with a large upper opening and a small lower opening, which makes it easy to calculate the thickness of the active layer 5 coated on one side of the positive plate 3 and the negative plate 2. The active layer 5 is made of lead paste. The conductivity of the lead paste allows the current to flow smoothly inside the battery, thereby ensuring the conductive performance of the battery.

[0030] Embodiment 2:

[0031] The present invention also discloses a method for manufacturing a pole group, and the specific steps are as follows:

[0032] Step 1: Injection mold the tank body 1 to ensure that its cross section is an isosceles trapezoid, measure the upper width A and lower width B of the tank body 1, measure the thickness U of the positive electrode plate 3 and the thickness V of the negative electrode plate 2, and determine the number M of positive electrode plates 3 and the number N of negative electrode plates 2 installed in the tank body 1;

[0033] Step 2: Calculate the thickness of the active layer 5 coated on the upper end of the positive electrode plate 3 and the negative electrode plate 2 by the formula {AM*(U+Y)-N*V} / {2*(M+N)}, and calculate the thickness of the active layer 5 coated on the lower end of the positive electrode plate 3 and the negative electrode plate 2 by the formula {BM*(U+Y)-N*V} / {2*(M+N)}, where Y is the sum of the thickness of the two side walls of the separator 4 connected to the single positive electrode plate 3;

[0034] The values ​​of A, B, U, Y, N, V, M and N can all be determined directly, so the coating thickness of the active layer 5 can be calculated. Moreover, the coating thickness of the single-side active layer 5 of the pole groups of different specifications can be calculated separately through these two formulas, thereby improving the scope of application of the pole group manufacturing method.

[0035] Step 3: Adjust the angle of the roller of the coating device so that the thickness of the active layer 5 coated on the upper and lower ends of the positive electrode plate 3 and the negative electrode plate 2 is equal to the two values ​​calculated by the above two formulas respectively;

[0036] The coating device is a common device for coating the active layer 5 on the electrode plate. This is a prior art and will not be described in detail here.

[0037] Step 4: insert the positive electrode plate 3 into the separator 4, and fix the positive electrode plate 3 and the negative electrode plate 2 in the tank body 1 in an alternating manner so that the pressure at the upper port of the tank body 1 is the same as the pressure at the lower port;

[0038] Since the width of the upper opening of the tank body 1 is greater than the width of the lower opening, and the thickness of the active layer 5 coated on the upper end of the positive electrode plate 3 and the negative electrode plate 2 is greater than the thickness of the active layer 5 coated on the lower end of the single side, and the coating thickness value is calculated by the above formula, it can be ensured that after the positive electrode plate 3 and the negative electrode plate 2 are fixed in the tank body 1, the pressure at the upper opening of the tank body 1 is the same as the pressure at the lower opening.

[0039] Step 5: inject electrolyte into the tank body 1 to perform a formation operation to complete the manufacturing operation of the battery electrode group.

[0040] Since the pressure at the upper and lower ports of the tank body 1 is the same, the electrolyte flows evenly into the bottom of the battery, and the active material is completely converted during the formation conversion, which balances the electrolyte density at the upper and lower parts and improves the discharge capacity and cycle durability.

[0041] Comparative experimental test data:

[0042]

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a pole group, characterized in that: The electrode group structure comprises a trough body (1) having a demoulding angle, wherein a plurality of positive electrode plates (3) and a plurality of negative electrode plates (2) are arranged in the trough body (1), wherein the plurality of positive electrode plates (3) and the plurality of negative electrode plates (2) are arranged in a staggered manner, wherein a separator (4) is coated on the positive electrode plates (3), wherein the width of the upper opening of the trough body (1) is greater than the width of the lower opening, and active layers (5) are coated on both sides of the positive electrode plates (3) and the negative electrode plates (2), wherein the upper end of the active layer (5) is thicker than the lower end so as to make the pressure of the upper opening and the lower opening of the trough body (1) equal; The specific steps of the method are as follows: Step 1: injection molding the tank body (1) to ensure that its cross section is an isosceles trapezoid, measuring the upper width A and the lower width B of the tank body (1), measuring the thickness U of the positive electrode plate (3) and the thickness V of the negative electrode plate (2), and determining the number M of positive electrode plates (3) and the number N of negative electrode plates (2) installed in the tank body (1); Step 2: Calculate the thickness of the active layer (5) coated on the upper end of one side of the positive electrode plate (3) and the negative electrode plate (2) by the formula {AM*(U+Y)-N*V} / {2*(M+N)}, and calculate the thickness of the active layer (5) coated on the lower end of one side of the positive electrode plate (3) and the negative electrode plate (2) by the formula {BM*(U+Y)-N*V} / {2*(M+N)}, where Y is the sum of the thickness of the two side walls of the separator (4) connected to the single positive electrode plate (3); Step 3: adjusting the angle of the roller of the coating device so that the thickness of the active layer (5) coated on the upper and lower ends of one side of the positive electrode plate (3) and the negative electrode plate (2) are respectively equal to the two values ​​calculated by the above two formulas; Step 4: inserting the positive electrode plate (3) into the separator (4), and fixing the positive electrode plate (3) and the negative electrode plate (2) in an alternating manner in the tank body (1), so that the pressure at the upper port of the tank body (1) is the same as the pressure at the lower port; Step 5: injecting electrolyte into the tank body (1) to perform a formation operation to complete the manufacturing operation of the battery electrode group.

2. A method for manufacturing a pole group according to claim 1, characterized in that: The tabs of the plurality of positive electrode plates (3) and the plurality of negative electrode plates (2) are located outside the tank body (1).

3. The method for manufacturing a pole group according to claim 1, characterized in that: The partition (4) is U-shaped and opens upward.

4. The method for manufacturing a pole group according to claim 1, characterized in that: The demoulding angle of the trough body (1) is 0.12 to 0.16 degrees on one side.

5. The method for manufacturing a pole group according to claim 1, characterized in that: The inner cavity cross-section of the tank body (1) is an isosceles trapezoid with a larger upper opening and a smaller lower opening.

6. A method for manufacturing a pole group according to claim 1, characterized in that: The active layer (5) is made of lead paste.

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