Manufacturing method of high-voltage port single battery with self thermal balance

Abstract

According to the manufacturing method of the high-voltage port single battery with self thermal balance, a plurality of pole piece level micro battery units in the single battery are grouped to be provided with the positive tabs and the negative tabs, and the positive tabs and the negative tabs are respectively arranged on the periphery and are connected in series, so that uniform heat dissipation in the single battery body is realized, and the internal series connection structure is optimized; the method improves the port voltage of the single battery, and overcomes the defects in the prior art that the heat distribution of each pole piece level micro battery unit is extremely non-uniform due to gradient distribution of heat in a high-capacity single battery, the voltage of the port of the single battery is low, the current is huge, the inconsistency of the internal temperature of the single battery is aggravated, and the service life of the single battery is prolonged. A large number of single batteries need to be connected in series to form a battery energy storage system, the short-plate effect of the battery energy storage system is increased, and the service life and the safety of the single batteries are directly influenced.

Description

Technical Field

[0001] This invention belongs to the field of battery manufacturing technology, specifically relating to a method for manufacturing a high-voltage port single cell with self-thermal equilibrium. Background Technology

[0002] With the large-scale application of energy storage batteries, the capacity of individual battery cells is increasing, and their application scope and scale are constantly expanding. Users are also demanding higher capacities from individual battery cells. Because the voltage at the terminals of individual battery cells is relatively low, typically only between 2V and 5V, with most nominal voltages between 2V and 3V, the current in individual battery cells is increasing. Large-capacity, high-current individual batteries require more electrode-level microcells. The consistency of these numerous electrode-level microcells directly affects the lifespan and safety of the individual battery. In particular, the positive and negative electrode terminals of the stacked electrode-level microcells are the hottest points during operation, radiating outwards... The tiered heat distribution results in extremely uneven heat distribution among the micro-cell cells at each electrode level. An Zhiguo et al.'s research, published in February 2018 in *Power Supply Technology*, titled "Discharge Thermal Simulation Analysis of Power Lithium-ion Batteries," concluded that temperature differences between individual cells severely impact their lifespan and safety. Furthermore, most battery application systems require high DC voltage levels of hundreds of volts or even thousands of volts for energy storage. This necessitates connecting a large number of low-voltage individual cells in series to achieve the high voltage level. An excessive number of individual cells connected in series increases the probability of inconsistency and the difficulty of control, severely affecting the efficiency and lifespan of the battery energy storage system and posing significant safety risks. Summary of the Invention

[0003] To address the shortcomings of the prior art, this invention proposes a method for manufacturing a high-voltage port single-cell battery with self-thermal equilibrium. This method involves grouping multiple electrode-level micro-cell units inside the single-cell battery and designing the positive and negative electrodes at different locations, thereby ensuring that the heat source is evenly distributed within the single-cell battery casing.

[0004] The specific manufacturing method of the high-voltage port single cell with self-thermal equilibrium includes the following steps:

[0005] S1, after stacking the positive electrode sheet, separator, negative electrode sheet, and separator, roll them and then die-cut them according to the dimensions designed for the battery casing to form an electrode-level micro battery unit;

[0006] S2, based on the voltage of the electrode-level micro battery unit and according to the design voltage of the single battery port, is divided into multiple groups. The positive and negative electrode tabs of each group of electrode-level micro battery units are designed in different positions, which facilitates the connection of positive and negative electrodes between adjacent groups when stacking.

[0007] S3, according to the design, the two adjacent positive and negative electrode tabs of each group are connected in series, and the stacked electrode tabs are pressed together and insulated.

[0008] S4, after the tabs are shaped, they are installed into the battery casing, and subsequent processes such as sealing and electrolyte injection are carried out to complete the battery manufacturing process.

[0009] Furthermore, the design voltage of the single cell port is based on the voltage of the electrode-level micro-cell unit, and multiple sets of electrode-level micro-cell units are connected in series to achieve the design voltage requirement of the single cell port.

[0010] Furthermore, the self-thermally balanced high-voltage port single cell is internally composed of multiple electrode-level micro-cell units divided into multiple groups, with the positive and negative electrode tabs of each group of electrode-level micro-cell units designed in different positions.

[0011] Furthermore, the specific design and arrangement of the positive and negative electrodes of each group of electrode-level micro-battery units is as follows: the positive and negative electrodes of each group are respectively set on the opposite side or the side of the opposite side, keeping the spacing between the positive and negative electrodes of each group at a relatively far end, and the positive electrode of the first group of electrode-level micro-battery units corresponds to the positive terminal of the single cell, and the negative electrode is set at the corresponding connection position opposite the positive electrode; in subsequent groups of electrode-level micro-battery units, the positive electrode of each group is set at the connection position overlapping with the negative electrode of the previous group, and its negative electrode is set on the opposite side or the side of the opposite side, and the negative electrode of the last group of electrode-level micro-battery units is set at the corresponding position of the negative terminal of the single cell.

[0012] Furthermore, a safety spacing is designed between the connection positions of any side of the stacked micro-battery units.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The method for manufacturing a high-voltage port cell with self-thermal equalization addresses the issue that large-capacity single cells are composed of numerous electrode-level micro-cell units. In particular, the positive and negative electrode ports of the stacked electrode-level micro-cell units are the hottest points during operation, distributing heat in a stepped manner to the surrounding area. This results in extremely uneven heat distribution among the electrode-level micro-cell units, directly affecting the lifespan and safety of the single cell. Furthermore, the voltage at the port of a single cell is only a few volts, resulting in a very large current, which not only exacerbates the temperature inconsistency within the single cell but also requires a large number of single cells to be connected in series to form a battery energy storage system. This increases the bottleneck effect of the battery energy storage system, reduces efficiency, and increases safety risks. This invention groups the numerous electrode-level micro-cell units within the single cell, setting positive and negative electrode tabs, arranging them around the perimeter and connecting them in series. This allows for uniform heat dissipation within the single cell and optimizes the internal series structure, increasing the port voltage of the single cell. This helps reduce the number of cells in the battery string in the battery energy storage system, reducing the bottleneck effect and improving efficiency and operational safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the electrode-level micro battery cell structure.

[0016] Figure 2 This is a schematic diagram of a single cell consisting of multiple electrode-level micro-battery units stacked and connected in two groups, forming a port voltage of 6V.

[0017] Figure 3 This is a schematic diagram of a single cell consisting of multiple electrode-level micro-battery units stacked and connected in four groups, forming a port voltage of 12V.

[0018] Figure 4 This is a schematic diagram of a single cell with a port voltage of 24V, consisting of multiple electrode-level micro-battery units stacked and connected in 8 groups. Figure 5 This is a schematic diagram of a single cell with a port voltage of 24V, in which multiple electrode-level micro-battery units are stacked and connected in 8 groups according to Example 3 of the specification. Detailed Implementation

[0019] As an example, a method for manufacturing a self-thermally balanced high-voltage port single cell is described in conjunction with the accompanying drawings. However, the described embodiments are only a part of the embodiments of the present invention applied to the manufacturing method of a self-thermally balanced high-voltage port single cell, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. The technology and solutions of the present invention are not limited to the content given in this example.

[0020] like Figure 1 and attached Figure 2 As shown, the method for manufacturing a high-voltage port single cell with self-thermal equilibrium is characterized by facilitating the uniform distribution of heat sources, grouping multiple electrode-level micro-battery units inside the single cell, designing the positive and negative electrodes in different positions, and connecting the positive and negative electrode tabs of two adjacent groups of electrode-level micro-battery units in series.

[0021] The method for manufacturing a high-voltage port single-cell battery with self-thermal equilibrium is characterized by:

[0022] S1, after stacking the positive electrode sheet, separator, negative electrode sheet, and separator, roll them and then die-cut them according to the dimensions designed for the battery casing to form an electrode-level micro battery unit;

[0023] S2, based on the voltage of the electrode-level micro battery unit and according to the design voltage of the single battery port, is divided into multiple groups. The positive and negative electrode tabs of each group of electrode-level micro battery units are designed in different positions, which facilitates the connection of positive and negative electrodes between adjacent groups when stacking.

[0024] S3, according to the design, the two adjacent positive and negative electrode tabs of each group are connected in series, and the stacked electrode tabs are pressed together and insulated.

[0025] S4, after the tabs are shaped, they are installed into the battery casing, and subsequent processes such as sealing and electrolyte injection are carried out to complete the battery manufacturing process.

[0026] The method for manufacturing a high-voltage port single cell with self-thermal equalization is characterized in that the design voltage of the single cell port is based on the voltage of the electrode-level micro-cell unit, and multiple sets of electrode-level micro-cell units are connected in series to achieve the design voltage requirement of the single cell port.

[0027] like Figure 3 As shown, the method for manufacturing a high-voltage port cell with self-thermal equalization, Example 1: Multiple electrode-level micro-battery units are stacked and connected in two groups to form a 6V port cell. The stacking and connection method is as follows: the positive electrode tab of the first group is set at the corresponding position of the 6V positive electrode post 11, and the negative electrode tab of the first group is set at the 6V first connection position 13 on the opposite side. The positive electrode tab of the second group is set at the overlapping position of the 6V first connection position 13, and the negative electrode tab of the second group is set at the corresponding position of the 6V negative electrode post 12 on the opposite side. The spacing between the positive and negative electrode tabs of each group is kept far apart, and a safe distance is left between the 6V positive electrode post 11 and the 6V negative electrode post 12 in the parallel position.

[0028] like Figure 4As shown, in Embodiment 2, a method for fabricating a high-voltage port cell with self-thermal equalization is described. Multiple electrode-level micro-cell units are stacked and connected in four groups to form a 12V port cell. The stacking and connection method is as follows: the positive electrode tab of the first group is positioned at the corresponding position of the 12V positive electrode post 21; the negative electrode tab of the first group is positioned at the 12V first connection position 24 on the opposite side of the far end; the positive electrode tab of the second group is positioned at the overlapping position of the 12V first connection position 24; and the negative electrode tab of the second group is positioned at the far end of the far end. The positive electrode tab of the third group is located at the overlapping position of the second 12V connection position 22 on the opposite side of the terminal. The negative electrode tab of the third group is located at the third 12V connection position 25 on the opposite side of the terminal with a distance between them. The positive electrode tab of the fourth group is located at the overlapping position of the third 12V connection position 25. The negative electrode tab of the fourth group is located at the corresponding position of the negative electrode post 23 on the opposite side of the terminal with a distance between them. A safe distance is maintained between the positive electrode post 21 and the negative electrode post 23 in parallel positions.

[0029] like Figure 5As shown, in Example 3 of the method for manufacturing a high-voltage port cell with self-thermal equalization, multiple electrode-level micro-cell units are stacked and connected in 8 groups to form a 24V port cell. The stacking and connection method is as follows: the positive electrode tab of the first group is set at the corresponding position of the 24V positive electrode post 31; the negative electrode tab of the first group is set at the 24V first connection position 37 on the opposite side of the far end of the interval; the positive electrode tab of the second group is set at the overlapping position of the 24V first connection position 37; the negative electrode tab of the second group is set at the 24V second connection position 32 on the opposite side of the far end of the interval; the positive electrode tab of the third group is set at the overlapping position of the 24V second connection position 32; the negative electrode tab of the third group is set at the 24V third connection position 36 on the opposite side of the far end of the interval; the positive electrode tab of the fourth group is set at the overlapping position of the 24V third connection position 36; the negative electrode tab of the fourth group is set at the opposite side of the far end of the interval. The 24V fourth connection position 39, the positive electrode tab of the fifth group is set at the overlapping position of the 24V fourth connection position 39, the negative electrode tab of the fifth group is set at the 24V fifth connection position 34 on the opposite side of the far end of the interval, the positive electrode tab of the sixth group is set at the overlapping position of the 24V fifth connection position 34, the negative electrode tab of the sixth group is set at the 24V sixth connection position 38 on the opposite side of the far end of the interval, the positive electrode tab of the seventh group is set at the overlapping position of the 24V sixth connection position 38, the negative electrode tab of the seventh group is set at the 24V seventh connection position 35 on the opposite side of the far end of the interval, the positive electrode tab of the eighth group is set at the overlapping position of the 24V seventh connection position 35, the negative electrode tab of the eighth group is set at the corresponding position of the 24V negative electrode post 33 on the opposite side of the far end of the interval, and a safe distance is maintained between the 24V positive electrode post 31, the 24V second connection position 32, and the 24V negative electrode post 33 in parallel positions.

[0030] The method for manufacturing a high-voltage port cell with self-thermal equalization involves grouping numerous electrode-level micro-cell units within the cell into positive and negative electrode tabs, arranging them around the periphery and connecting them in series. This allows for uniform heat dissipation within the cell and optimizes the internal series connection structure, increasing the port voltage of the cell. This overcomes the problem of uneven heat distribution in existing large-capacity cells, which results in highly uneven heat distribution among the electrode-level micro-cell units. Furthermore, the low port voltage and high current of the cell not only exacerbate the temperature inconsistency within the cell but also require a large number of cells to be connected in series to form a battery energy storage system, increasing the bottleneck effect of the battery energy storage system and directly affecting the lifespan and safety of the individual cells.

[0031] The above provides specific implementation methods, but the present invention is not limited to the described implementation methods. For those skilled in the art, designing various modified combinations, formulas, and parameters based on the technical solutions of the present invention does not require creative effort. Changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and conceptual framework of the present invention still fall within the protection scope of the present invention.

Claims

1. A method of making a self-thermally balanced high voltage ported unit cell, the method comprising: Multiple electrode-level micro-battery units inside a single cell are grouped together, and the positive and negative electrodes are designed in different positions, so that the heat source is evenly distributed inside the single cell casing. ​ The specific manufacturing method of the high-voltage port single cell with self-thermal equilibrium includes the following steps: S1, after stacking the positive electrode sheet, separator, negative electrode sheet, and separator, roll them and then die-cut them according to the dimensions designed for the battery casing to form an electrode-level micro battery unit; S2, based on the voltage of the electrode-level micro battery unit and according to the design voltage of the single battery port, is divided into multiple groups. The positive and negative electrode tabs of each group of electrode-level micro battery units are designed in different positions, which facilitates the connection of positive and negative electrodes between adjacent groups when stacking. S3, according to the design, the two adjacent positive and negative electrode tabs of each group are connected in series, and the stacked electrode tabs are pressed together and insulated. S4, after the tabs are shaped, they are installed into the battery casing, and subsequent processes such as sealing and electrolyte injection are carried out to complete the battery manufacturing process.

2. The method of claim 1, wherein the self-heat equalizing high voltage ported single cell battery is characterized by: The design voltage of the single cell port is based on the voltage of the electrode-level micro-cell unit, and multiple sets of electrode-level micro-cell units are connected in series to achieve the design voltage requirement of the single cell port.

3. The method of claim 1, wherein the self-heating equalizing high voltage ported cell is characterized by: The high-voltage port single cell with self-thermal equilibrium is internally composed of multiple electrode-level micro-cell units divided into multiple groups, with the positive and negative electrode tabs of each group of electrode-level micro-cell units designed in different positions.

4. The method of claim 1, wherein the self-heating equalizing high voltage ported cell is characterized by: The specific design and arrangement of the positive and negative electrodes of each group of electrode-level micro-battery units are as follows: the positive and negative electrodes of each group are respectively set on the opposite side or the side of the opposite side, keeping the spacing between the positive and negative electrodes of each group at a relatively far end, and the positive electrode of the first group of electrode-level micro-battery units corresponds to the positive terminal of the single cell, and the negative electrode is set at the corresponding connection position opposite the positive electrode; in subsequent groups of electrode-level micro-battery units, the positive electrode of each group is set at the connection position overlapping with the negative electrode of the previous group, and its negative electrode is set on the opposite side or the side of the opposite side, and the negative electrode of the last group of electrode-level micro-battery units is set at the corresponding position of the negative terminal of the single cell.

5. The method of claim 1, wherein the self-heating equalizing high voltage ported cell is characterized by: A safety spacing is designed between the connection positions of any side of the stacked micro-battery cells.

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