A method for manufacturing a current collecting grid special for lithium hyposulfuryl chloride battery ER34615

Abstract

The application discloses a kind of lithium chlorosulfite battery ER34615 special current collecting net production method.It prepares the lithium chlorosulfite battery ER34615 special current collecting net, including cover group, round stainless steel pressing plate and cylindrical stainless steel drawing net;Round stainless steel pressing plate is set on the T head stainless steel column of cover group;Cylindrical stainless steel drawing net is vertically set in the center position on round stainless steel pressing plate;Cover group includes cover plate, T head stainless steel column, glass insulator and liquid injection hole;T head stainless steel column is set in the center hole position of cover plate and vertically set with cover plate, glass insulator is wrapped on the outer wall of T head stainless steel column, and is located between T head stainless steel column and the center hole of cover plate;Liquid injection hole is set on cover plate, and is located in the side of T head stainless steel column.The application has the advantages of uniform stress on contact surface, large resistance on contact surface, high load voltage and high discharge capacity.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, specifically to a method for manufacturing a dedicated current collector for lithium thionyl chloride batteries ER34615. Background Technology

[0002] The lithium thionyl chloride battery uses metallic lithium as the negative electrode, participating in the reaction as the negative electrode active material; a mixture of porous carbon black and polytetrafluoroethylene emulsion serves as the positive electrode; liquid thionyl chloride, a non-aqueous inorganic solvent, dissolves the electrolyte lithium tetrachloroaluminum and serves as the electrolyte, while also participating in the reaction as the positive electrode active material; and a stainless steel current collector forms the conductive framework of the electrochemical power source. This battery system is a high-energy chemical power source. The overall reaction mechanism is: 4Li + 2SOCl₂ → 4LiCl + S + SO₂. During storage, once the lithium negative electrode comes into contact with the electrolyte, it reacts with thionyl chloride to form lithium chloride, and the lithium negative electrode is protected by the lithium chloride film formed on it. This lithium chloride film is called a passivation film, which helps extend the battery's storage life, but causes voltage hysteresis at the beginning of discharge. The stainless steel current collector, as the conductive framework, connects the active material to the external circuitry, ensures uniform current distribution, and also supports the active material. Traditional flat current collectors exhibit uneven stress on the contact surface when supporting the positive electrode material, and the small contact surface results in high resistance, leading to low load voltage and low discharge capacity. This phenomenon is even more pronounced in the lithium thionyl chloride battery ER34615.

[0003] Therefore, it is necessary to develop a new method for manufacturing a dedicated current collector for the lithium thionyl chloride battery ER34615. Summary of the Invention

[0004] The purpose of this invention is to provide a method for manufacturing a dedicated current collector for lithium thionyl chloride batteries ER34615, which features uniform stress on the contact surface, large contact surface with low resistance, high load voltage, and high discharge capacity.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a method for manufacturing a dedicated current collector for lithium thionyl chloride batteries ER34615, characterized in that: the prepared dedicated current collector for lithium thionyl chloride batteries ER34615 includes a cover assembly, a circular stainless steel pressure plate, and a cylindrical stainless steel mesh; the circular stainless steel pressure plate is disposed on the T-head stainless steel column of the cover assembly; the cylindrical stainless steel mesh is vertically disposed at the center position of the circular stainless steel pressure plate.

[0006] The cover assembly includes a cover plate, a T-shaped stainless steel column, a glass insulator, and an injection hole. The T-shaped stainless steel column is located at the center hole of the cover plate and is perpendicular to the cover plate. The glass insulator is wrapped around the outer wall of the T-shaped stainless steel column and is located between the T-shaped stainless steel column and the center hole of the cover plate. The injection hole is located on the cover plate and is located to the side of the T-shaped stainless steel column.

[0007] The specific preparation method of the dedicated current collector for lithium thionyl chloride batteries ER34615 includes the following steps.

[0008] Step 1: First, spot weld the round stainless steel pressure plate onto the T-head stainless steel column of the cover assembly according to the technical dimensions;

[0009] Step 2: Next, spot weld the cylindrical stainless steel mesh vertically to the center of the circular stainless steel pressure plate according to the technical dimensions.

[0010] In the above technical solution, in step one, a circular stainless steel pressure plate is spot-welded onto the positive electrode rod (i.e., the T-head stainless steel column). The outer diameter of the circular stainless steel pressure plate is 21 mm and the thickness is 0.2 mm.

[0011] In the above technical solution, in step two, a cylindrical stainless steel mesh is vertically spot-welded to the center of the circular stainless steel pressure plate. The cylindrical stainless steel mesh has a thickness of 0.4 mm, an outer diameter of 8 mm, and a height of 45.4 mm.

[0012] The present invention has the following advantages:

[0013] (1) The novel current collector network prepared by this invention, which is used as a conductive skeleton, improves the discharge plateau voltage and increases the battery capacity; it overcomes the defect of low discharge capacity of batteries made by traditional flat current collector networks as conductive skeletons (taking ER34615 as an example, with a discharge current of 100 mA, the discharge plateau voltage is only 3.0V and the discharge capacity is about 12000 mA).

[0014] (2) The battery made using the current collector of this invention has a maximum open circuit voltage of 3.7V, a resistance of 33Ω, an initial load voltage of 3.5V, a constant discharge plateau voltage of 33Ω of 3.3V, and a discharge capacity of 16000 mAh. All indicators far exceed those of batteries made using traditional current collectors. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is the front view of the present invention.

[0017] Figure 3 This is a bottom view of the present invention.

[0018] Figure 4 The figure shows the experimental results of the comparative example of this invention.

[0019] Figure 5 The figure shows the experimental results of Embodiment 1 of the present invention.

[0020] Figure 6 The figure shows the experimental results of Embodiment 2 of the present invention.

[0021] Figure 7 The figure shows the experimental results of Embodiment 3 of the present invention.

[0022] exist Figure 4 In the diagram, D5 represents point 5 of the comparative example; D6 represents point 6 of the comparative example; D7 represents point 7 of the comparative example; and D8 represents point 8 of the comparative example.

[0023] exist Figure 5 , Figure 6 and Figure 7 In the diagram, D1 represents point 1 of the comparative example; D2 represents point 2 of the comparative example; D3 represents point 3 of the comparative example; and D4 represents point 4 of the comparative example.

[0024] In the diagram, 1-cover plate, 2-T-head stainless steel column, 3-glass insulator, 4-injection hole, 5-circular stainless steel pressure plate, and 6-cylindrical stainless steel mesh. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, these descriptions do not constitute a limitation of the present invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0026] This invention, based on existing technology, adds a circular stainless steel pressure plate 5 to the T-head stainless steel column 2 by spot welding; and replaces the traditional flat current collector with a cylindrical stainless steel mesh 6, which is vertically spot welded to the center of the circular stainless steel pressure plate 5. This increases the discharge plateau voltage and battery capacity. It overcomes the shortcomings of batteries made with traditional flat current collectors as conductive skeletons, such as the ER34615, where the discharge plateau voltage is only 3.0V and the discharge capacity is low (around 12000mAh) at a current discharge of 100mA. The battery made with the current collector prepared by this invention can achieve a maximum open circuit voltage of 3.7V, an initial load voltage of 3.5V with a resistance of 33Ω, a plateau voltage of 3.3V with a constant discharge of 33Ω, and a capacity of 16000mAh. All indicators far exceed those of batteries made with traditional current collectors.

[0027] Referring to the attached drawings: A method for manufacturing a dedicated current collector for lithium thionyl chloride batteries ER34615, the prepared dedicated current collector for lithium thionyl chloride batteries ER34615 includes a cover assembly, a circular stainless steel pressure plate 5, and a cylindrical stainless steel mesh 6; the circular stainless steel pressure plate 5 is set on the T-head stainless steel column 2 of the cover assembly; the cylindrical stainless steel mesh 6 is vertically set at the center position of the circular stainless steel pressure plate 5.

[0028] The cover assembly includes a cover plate 1, a T-shaped stainless steel column 2, a glass insulator 3, and an injection hole 4. The T-shaped stainless steel column 2 is located at the center hole of the cover plate 1 and is perpendicular to the cover plate 1. The glass insulator 3 is wrapped around the outer wall of the T-shaped stainless steel column 2 and is located between the T-shaped stainless steel column 2 and the center hole of the cover plate 1. The injection hole 4 is located on the cover plate 1 and is located to the side of the T-shaped stainless steel column 2.

[0029] The specific preparation method of the dedicated current collector for lithium thionyl chloride batteries ER34615 includes the following steps.

[0030] Step 1: First, spot weld the circular stainless steel pressure plate 5 onto the T-head stainless steel column 2 of the cover assembly according to the technical dimensional requirements;

[0031] Step 2: Next, spot weld the cylindrical stainless steel mesh 6 vertically to the center of the circular stainless steel pressure plate 5 according to the technical dimensional requirements.

[0032] Furthermore, in step one, a circular stainless steel pressure plate 5 is spot-welded onto the positive electrode rod. The outer diameter of the circular stainless steel pressure plate 5 is 21 mm, and the thickness is 0.2 mm. After the lithium thionyl chloride battery is filled with electrolyte, the positive electrode material will expand. Adding the stainless steel pressure plate 5 can prevent the positive electrode material from expanding excessively upward, allowing the positive electrode material to expand laterally so that it tightly wraps around the cylindrical stainless steel mesh 6.

[0033] Furthermore, in step two, a cylindrical stainless steel mesh 6 is spot-welded onto the circular stainless steel pressure plate 5. The cylindrical stainless steel mesh 6 has a thickness of 0.4 mm, an outer diameter of 8 mm, and a height of 45.4 mm. Using the cylindrical stainless steel mesh 6 allows for 360-degree all-around contact with the positive electrode material, and it is tightly wrapped by the laterally expanded positive electrode material, increasing the contact area and density between the current collector and the positive electrode material, reducing the battery's internal resistance, and increasing the load voltage.

[0034] Comparative Example 1

[0035] A method for manufacturing a current collector for a lithium thionyl chloride battery: a cover plate 1 is set on the top of a T-head stainless steel column 2, and a flat square current collector is set on the outer periphery of the T-head stainless steel column 2 to prepare a lithium thionyl chloride battery.

[0036] The lithium thionyl chloride battery prepared in this embodiment has the following characteristics: voltage type 3.0V; discharge location: 1 cabinet, 4 screens, 3 rows; discharge mode: 24h / d; load resistance: 33Ω; termination voltage: 2.000V; uniformity: 88.50%; discharge date: 2020-10-27; end date: 2020-11-03; testing environment: room temperature, humidity 60%; testing instrument: DM-2200A battery dual-resistance automatic discharge testing system (V3.62).

[0037] The test results for this comparative example are shown in Table 1.

[0038] Table 1 shows the test results of the comparative examples.

[0039]

[0040]

[0041] Table 1 lists the testing points for the battery performance testing equipment, numbered 1 to 9. This equipment has a total of 9 testing points and can simultaneously test the electrical performance of 9 batteries. This comparative example used 4 batteries for testing, utilizing testing points 5 to 8. (From Table 1 and...) Figure 4 It can be seen that the battery capacity in this comparative example is relatively small.

[0042] Example 1

[0043] A method for manufacturing a current collector for a lithium thionyl chloride battery ER34615 is described in this embodiment. Based on the existing technology, a circular stainless steel pressure plate 5 is added and spot-welded to the T-head stainless steel column 2. The traditional flat current collector is then replaced with a cylindrical stainless steel mesh 6, which is vertically spot-welded to the center of the circular stainless steel pressure plate 5.

[0044] 5. Circular stainless steel pressure plate, outer diameter 21 mm, thickness 0.2 mm; 6. Cylindrical stainless steel mesh, thickness 0.4 mm, outer diameter 10 mm, height 45.4 mm.

[0045] Based on existing technology, with other technical parameters remaining unchanged, a lithium thionyl chloride battery (model ER34615) was prepared.

[0046] The lithium thionyl chloride battery prepared in this embodiment has a voltage type of 3.0V, a discharge location of 1 cabinet, 2 screens, and 1 row, a discharge mode of 24h / d, a load resistance of 33Ω, a termination voltage of 2.000V, a uniformity of 87.22%, a discharge date of 2022-02-25, an end date of 2022-03-05, a testing environment of room temperature and 60% humidity, and a testing instrument of a DM-2200A battery dual-resistance automatic discharge testing system (V3.62).

[0047] The detection results of this embodiment are shown in Table 2.

[0048] Table 2 Test Results

[0049]

[0050] Table 2 lists the testing points for the battery performance testing equipment, numbered 1 to 9. This equipment has 9 testing points and can simultaneously test the electrical performance of 9 batteries. In this embodiment, 4 batteries were tested, using points 1 to 4. The electrical performance was tested for three values: open-circuit voltage, load voltage (initial voltage), and capacity. Higher capacity means the battery discharges more electricity and has a longer lifespan. This is consistent with Table 2 of this embodiment, Table 1 of Comparative Example 1, and the appendix to the instruction manual. Figure 4 , Figure 5 It can be seen that the battery capacity of this embodiment is much larger than that of Comparative Example 1, and the battery capacity has been greatly improved.

[0051] Example 2

[0052] A method for manufacturing a current collector for a lithium thionyl chloride battery ER34615 is the same as in Example 1, except that: a cylindrical stainless steel mesh 6 is 0.4 mm thick, 9 mm in outer diameter, and 45.4 mm in height.

[0053] The lithium thionyl chloride battery prepared in this embodiment has the following characteristics: voltage type 3.0V; discharge location: 1 cabinet, 3 screens, 2 rows; discharge mode: 24h / d; load resistance: 33Ω; termination voltage: 2.000V; uniformity: 94.65%; discharge date: 2022-03-11; end date: 2022-03-18; testing environment: room temperature, humidity 60%; testing instrument: DM-2200A battery dual-resistance automatic discharge testing system (V3.62).

[0054] The detection results of this embodiment are shown in Table 3.

[0055] Table 3 Test Results II

[0056]

[0057]

[0058] Table 3 lists the locations of the battery performance testing equipment, numbered 1 to 9. This equipment has a total of 9 locations and can test the electrical performance of 9 batteries simultaneously. In this embodiment, 4 batteries were sampled for testing, using locations 1 to 4.

[0059] By comparing Table 3 of this embodiment with Table 1 of Comparative Example 1, and the appendix to the specification... Figure 4 , Figure 6 It can be seen that the battery capacity in this embodiment is much larger than that in Comparative Example 1, and the battery capacity has been greatly improved.

[0060] Example 3

[0061] A method for manufacturing a current collector for a lithium thionyl chloride battery ER34615 is the same as in Example 1, except that: a cylindrical stainless steel mesh 6 is 0.4 mm thick, 8 mm in outer diameter, and 45.4 mm in height.

[0062] The lithium thionyl chloride battery prepared in this embodiment has the following characteristics: voltage type 3.0V; discharge location: 1 cabinet, 7 screens, 3 rows; discharge mode: 24h / d; load resistance: 33Ω; termination voltage: 2.000V; uniformity: 90.63%; discharge date: 2022-04-30; end date: 2022-05-10; testing environment: room temperature, humidity 60%; testing instrument: DM-2200A battery dual-resistance automatic discharge testing system (V3.62).

[0063] The detection results of this embodiment are shown in Table 4.

[0064] Table 4 Test Results (Part 3)

[0065]

[0066]

[0067] Table 4 lists the locations of the battery performance testing equipment, numbered 1 to 9. This equipment has a total of 9 locations and can test the electrical performance of 9 batteries simultaneously. In this embodiment, 4 batteries were sampled for testing, using locations 1 to 4.

[0068] By comparing Table 4 of this embodiment with Table 1 of Comparative Example 1, and the appendix to the specification... Figure 4 , Figure 7 It can be seen that the battery capacity in this embodiment is much larger than that in Comparative Example 1, and the battery capacity has been greatly improved.

[0069] At the same time, from the curve Figures 4-6 It can also be seen that the value on the X-axis is getting larger and larger, indicating that the battery discharge time is getting longer and longer, which means that the battery life is getting longer and longer, and the battery capacity is getting bigger and bigger.

[0070] Meanwhile, from Examples 1, 2, 3 and Figure 5 , Figure 6 , Figure 7 It can be seen that the battery capacity of cylindrical stainless steel mesh 6 with different outer diameters is different. The smaller the outer diameter of the cylindrical stainless steel mesh 6, the larger the battery capacity. The battery capacity is the largest when the outer diameter of the cylindrical stainless steel mesh 6 is 8 mm.

[0071] All other unspecified parts belong to the prior art.

Claims

1. A method for manufacturing a dedicated current collector for lithium thionyl chloride batteries ER34615, characterized in that: The prepared lithium thionyl chloride battery ER34615 special current collector includes a cover assembly, a circular stainless steel pressure plate (5) and a cylindrical stainless steel mesh (6); the circular stainless steel pressure plate (5) is set on the T-head stainless steel column (2) of the cover assembly; the cylindrical stainless steel mesh (6) is vertically set at the center position of the circular stainless steel pressure plate (5). The cover assembly includes a cover plate (1), a T-shaped stainless steel column (2), a glass insulator (3), and an injection hole (4); the T-shaped stainless steel column (2) is located at the center hole of the cover plate (1) and is perpendicular to the cover plate (1); the glass insulator (3) is wrapped around the outer wall of the T-shaped stainless steel column (2) and is located between the T-shaped stainless steel column (2) and the center hole of the cover plate (1); the injection hole (4) is located on the cover plate (1) and is located to the side of the T-shaped stainless steel column (2); The circular stainless steel pressure plate (5) is used to prevent the positive electrode material from expanding excessively upward after the battery is filled with electrolyte, and to allow the positive electrode material to expand laterally so that it wraps around the cylindrical stainless steel mesh (6); the cylindrical stainless steel mesh (6) is in 360-degree all-round contact with the positive electrode material. The specific preparation method of the dedicated current collector for lithium thionyl chloride batteries ER34615 includes the following steps. Step 1: First, spot weld the circular stainless steel pressure plate (5) onto the T-head stainless steel column (2) of the cover assembly according to the technical dimensions; the outer diameter of the circular stainless steel pressure plate (5) is 21 mm and the thickness is 0.2 mm; Step 2: Then, the cylindrical stainless steel mesh (6) is vertically spot-welded to the center of the circular stainless steel pressure plate (5) according to the same technical size requirements; the cylindrical stainless steel mesh (6) has a thickness of 0.4 mm, an outer diameter of 8 mm, and a height of 45.4 mm.

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