Manufacturing step of rechargeable cylindrical lithium battery with built-in BMS board

Abstract

To provide a manufacturing step of a rechargeable cylindrical lithium battery with a built-in BMS board.SOLUTION: A manufacturing step includes a cap manufacturing step, a battery core manufacturing step, and a finished product assembly step, and a BMS board is integrated inside a cylindrical lithium battery, which can solve the size and weight problems caused by the conventional external BMS board, and can provide protection for the battery charge and discharge with high integration and high stability, thereby improving the safety of the battery. Here, a BMS chip is used to monitor the battery status such as voltage, current, temperature, etc., and manages the battery charge and discharge on the basis of the monitoring results, the power management chip is used to supply power to the battery and manage charging, the battery control chip is used to control the battery charge and discharge, and a multiplexer is used to realize protection against overvoltage, undervoltage, overcurrent, short circuit, etc. of a battery.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of cylindrical lithium batteries, and in particular to the manufacturing process of rechargeable cylindrical lithium batteries incorporating a BMS substrate. [Background technology]

[0002] A cylindrical lithium battery is a common rechargeable battery in a cylindrical shape. It consists of one positive electrode, one negative electrode and one electrolyte. The positive electrode of a cylindrical lithium battery is usually made of a lithium compound (such as lithium cobalt oxide or lithium iron phosphate) and a conductive agent, and the negative electrode is usually made of a carbon material.

[0003] However, in practical use, the following drawbacks exist: Most of the BMS systems currently on the market use an independent BMS protection board that must be installed separately from the battery itself. However, the traditional independent BMS method integrated outside the battery has the disadvantages of increased battery size and weight, high cost, and complex installation, limiting the scope and performance of battery applications.

[0004] Therefore, a manufacturing process of a rechargeable cylindrical lithium battery with built-in BMS substrate is presented to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0005] The objective of the present invention is to provide a manufacturing process for a rechargeable cylindrical lithium battery with a built-in BMS substrate to solve the problems that most of the commercially available BMS systems mentioned in the background art above use an independent BMS protection substrate, which needs to be installed separately from the battery itself. However, the traditional independent BMS method integrated outside the battery has the disadvantages of increasing the size and weight of the battery, high cost, and complicated installation, which limit the scope and performance of battery applications. [Means for solving the problem]

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention is a manufacturing process for a rechargeable cylindrical lithium battery with a built-in BMS substrate, which includes the following steps: A cap manufacturing process, including: Step 1, implementation process, Step 2: Waterproof the plastic bracket and spray sealant onto it (it will soften after drying naturally). Step 3: The positive aluminum cap is installed into the plastic bracket after the sealant has dried naturally, and then the PCBA and the negative metal ring are inserted in order to complete the manufacture of the lithium battery cap with built-in PCBA.

[0007] A manufacturing process for battery winding core, including: Step 1, mix ingredients, Step 2, application, Step 3, sheet manufacturing, Step 4: Winding. Finished product assembly process, including: Step 1: Insert the battery core into the steel case, and then laser weld the negative aluminum sheet to the inside bottom of the steel case. Step 2: Roll the groove of the steel case so that the battery core is fixed inside the steel case and does not fall out. Step 3: Laser weld the positive electrode of the battery core to the back edge of the positive aluminum cap. Step 4: Dry the components with the caps welded to remove moisture, inject the electrolyte, Step 5: Roll the entire opening of the steel case inward, press it against the negative metal ring, and seal it to make the negative electrode conductive; Step 6: According to the customer's appearance requirements, cover the corresponding printing sleeve, print the code, Step 7: Put it in the cabinet and perform chemical conversion treatment and aging treatment. Step 8: Fully charge the rechargeable lithium batteries after aging treatment, and separate the batteries of different capacities and voltages. Step 9: Pack the battery in a special packaging box for rechargeable lithium batteries to ensure safe storage and transportation.

[0008] Furthermore, the implementation process is specifically as follows: The positive metal pole, IC and other electronic components are mounted on the PCBA to complete the assembly process of the BMS motherboard.

[0009] Furthermore, the plastic bracket described in step 2 of the cap manufacturing process is made of PP soft material, and the sealant injection position is the sealant groove and the bottom surface of the plastic bracket; The sealant groove is provided on the inner wall of the plastic bracket.

[0010] Furthermore, step 1 of the battery winding core manufacturing process is specifically as follows: The solutions were prepared as follows: positive electrode PVDF and solvent NMP, negative electrode SBR and CMC.

[0011] Furthermore, step 2 of the battery winding core manufacturing process is specifically as follows: The prepared solution is applied to an aluminum sheet.

[0012] Furthermore, step 3 of the battery winding core manufacturing process is specifically as follows: Apply adhesive tape separator to coated aluminum sheet, nickel sheet and cut to appropriate electrode sheet size.

[0013] Furthermore, step 4 of the battery winding core manufacturing process is specifically as follows: The produced electrode sheet and separator paper are then rolled into a cylindrical shape to complete the manufacture of the battery winding core.

[0014] Furthermore, in step 7 of the final assembly process, the time for chemical conversion treatment in the cabinet is 2-3 days to activate the capacity of the cell, and the aging treatment time is 8 days.

[0015] Furthermore, the plastic bracket is connected to the top of the inner wall of the steel case, the positive aluminum cap is installed in the plastic bracket, the PCBA is installed in the positive aluminum cap, the negative metal ring is installed on the upper outer edge of the PCBA, the positive metal pole is connected to the upper center of the PCBA, the battery winding core is connected to the inside of the steel case, the positive end of the battery winding core extends from the inside of the battery winding core, and the negative aluminum sheet is connected to the inner bottom end of the steel case; A positive electrode plastic cap is connected to the outside of the positive electrode metal post. Effect of the Invention

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention integrates a BMS board inside a cylindrical lithium battery, which can solve the problems of size and weight caused by the conventional external BMS board, and can provide protection for the charging and discharging of the battery with high integration and high stability, thereby improving the safety of the battery. Here, the BMS chip is used to monitor the battery status such as voltage, current, temperature, etc., and manages the charging and discharging of the battery based on the monitoring results, the power management chip is used to supply power to the battery and manage charging, the battery control chip is used to control the charging and discharging of the battery, and the multiplexer is used to realize protection against overvoltage, undervoltage, overcurrent, short circuit, etc. of the battery.

[0018] Of course, any given product embodying the present invention need not necessarily achieve all of the above advantages simultaneously. [Brief description of the drawings]

[0019] In order to more clearly describe the technical solutions of the embodiments of the present invention, the following briefly describes the drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts. [Figure 1]FIG. 1 is a flow diagram of the manufacturing process of the present invention. [Diagram 2] FIG. 2 is an exploded bottom view of the present invention. [Diagram 3] FIG. 3 is an exploded top view of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of the present invention. [Diagram 5] FIG. 5 is an outline drawing of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] In order to make the above objects, features and advantages of the present invention clearer and more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the drawings. In the following description, the present invention is described in more detail for a fuller understanding, but the present invention can be implemented in other ways not described herein, and those skilled in the art can make similar applications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. In addition, the present invention will be described in detail with schematic diagrams, and in the detailed description of the embodiments of the present invention, for ease of explanation, the cross-sectional views showing the device structure are not locally enlarged according to a general ratio, and the schematic diagrams are merely examples and do not limit the scope of protection of the present invention. In addition, the actual fabrication needs to include three-dimensional spatial dimensions of length, width, and depth. In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in more detail below in conjunction with the drawings. EXAMPLES

[0021] Working Example As shown in FIG. 1 to FIG. 5, the present embodiment is a manufacturing process of a rechargeable cylindrical lithium battery with a built-in BMS substrate, which includes the following steps: A cap manufacturing process, including: Step 1, implementation process, The implementation process is specifically as follows: The positive metal post 9, IC and other electronic components are mounted on the PCBA 3 to complete the mounting process of the BMS motherboard.

[0022] Specifically, the implementation process is to complete the assembly of a BMS motherboard and use it to monitor the status of rechargeable lithium batteries. Step 2: Apply a waterproof paint to the plastic bracket 5, spray with sealant, and let it soften after drying naturally.

[0023] The plastic bracket 5 described in step 2 of the cap manufacturing process is made of PP soft material, and the sealant injection position is the sealant groove 10, the bottom surface of the plastic bracket 5; A sealant groove 10 is provided on the inner wall of the plastic bracket 5 .

[0024] Specifically, waterproof coating is performed to improve the waterproofness of the plastic bracket 5 and to extend the service life of the rechargeable lithium battery 12. In addition, the use of soft PP material has the advantages of being lightweight and having excellent heat insulation, and the sealant groove 10 can be used to further improve the sealing performance.

[0025] Step 3: The positive aluminum cap 4 is mounted into the plastic bracket 5 after the sealant has dried naturally, and then the PCBA 3 and the negative metal ring 2 are inserted in order to complete the manufacture of the lithium battery cap with the built-in PCBA 3.

[0026] Specifically, this completes the manufacturing of the entire lithium battery cap.

[0027] A battery winding core manufacturing process, including:

[0028] Step 1, mix ingredients, Step 1 of the battery winding core manufacturing process is specifically as follows: The solutions were prepared as follows: positive electrode PVDF and solvent NMP, negative electrode SBR and CMC.

[0029] Step 2, application, Step 2 of the battery winding core manufacturing process is specifically as follows: The prepared solution is applied to an aluminum sheet.

[0030] Step 3, sheet manufacturing, Step 3 of the battery winding core manufacturing process is specifically as follows: Apply adhesive tape separator to coated aluminum sheet, nickel sheet and cut to appropriate electrode sheet size.

[0031] Step 4, winding, Step 4 of the battery winding core manufacturing process is specifically as follows: The produced electrode sheet and separator paper are then rolled into a cylindrical shape to complete the manufacture of the battery winding core.

[0032] Finished product assembly process, including: Step 1: Insert the battery core 7 into the steel case 6, and laser weld the negative electrode aluminum sheet 11 to the inside bottom of the steel case 6. Specifically, the steel case 6 supports the battery winding core 7, and the negative aluminum sheet 11 is connected to the inner bottom of the steel case 6 by laser welding to meet the demand of the power supply.

[0033] Step 2: The groove of the steel case 6 is rolled so that the battery core 7 is fixed inside the steel case 6 and does not fall out. Step 3: Laser welding the positive electrode 8 of the battery core to the back edge of the positive aluminum cap 4; Step 4: Dry the components with the caps welded to remove moisture, inject the electrolyte, Step 5: Roll the entire opening of the steel case 6 inward, press it against the negative electrode metal ring 2, and seal it so that the negative electrode is conductive. Step 6: According to the customer's appearance requirements, cover the corresponding printing sleeve, print the code, Step 7: Put it in the cabinet and perform chemical conversion treatment and aging treatment. In step 7 of the finished product assembly process, the time for chemical conversion treatment in the cabinet is 2-3 days to activate the capacity of the cell, and the aging treatment time is 8 days.

[0034] Step 8: Fully charge the rechargeable lithium batteries 12 after aging treatment, and separate the batteries with different capacities and voltages;

[0035] Step 9: Pack the rechargeable lithium battery (12) in a special packaging box to ensure safe storage and transportation.

[0036] A plastic bracket 5 is connected to the top of the inner wall of the steel case 6, a positive aluminum cap 4 is installed in the plastic bracket 5, a PCBA 3 is installed in the positive aluminum cap 4, a negative metal ring 2 is installed on the upper outer edge of the PCBA 3, a positive metal post 9 is connected to the upper center of the PCBA 3, a battery winding core 7 is connected to the inside of the steel case 6, an end of a positive electrode 8 of the battery winding core extends from the inside of the battery winding core 7, and a negative aluminum sheet 11 is connected to the inner bottom end of the steel case 6.

[0037] A positive electrode plastic cap 1 is connected to the outside of the positive electrode metal post 9 .

[0038] In the manufacturing process of the rechargeable cylindrical lithium battery, the BMS board is integrated inside the cylindrical lithium battery, which can solve the problems of size and weight caused by the conventional external BMS board, and can provide protection for the charging and discharging of the battery with high integration and high stability, thereby improving the safety of the battery. Here, the BMS chip is used to monitor the battery status such as voltage, current, temperature, etc., and manages the charging and discharging of the battery based on the monitoring results, the power management chip is used to supply power to the battery and manage the charging, the battery control chip is used to control the charging and discharging of the battery, and the multiplexer is used to realize protection against overvoltage, undervoltage, overcurrent, short circuit, etc. of the battery.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "mounting", "coupling" and "connection" should be understood in a broad sense, for example, fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, direct connection, indirect connection via an intermediate, and internal connection of two elements. Those skilled in the art can understand the meaning of the above terms in the present invention according to the specific situation.

[0040] It should be noted that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention, and the present invention has been described in detail with reference to the above embodiments. However, those skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features with equivalents. Furthermore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and principle of the present invention are all within the scope of the protection of the present invention. [Explanation of symbols]

[0041] 1: Positive electrode plastic cap, 2: Negative electrode metal ring, 3: PCBA, 4: Positive electrode aluminum cap, 5: Plastic bracket, 6: Steel case, 7: Battery core, 8: Positive electrode of battery core, 9: Positive electrode metal post, 10: Sealant groove, 11: Negative electrode aluminum sheet, 12: Rechargeable lithium battery

Claims

1. A manufacturing process for a rechargeable cylindrical lithium battery incorporating a BMS substrate, comprising the steps of: A cap manufacturing process, including: Step 1, implementation process, Step 2: Waterproof the plastic bracket (5) and spray it with sealant (it will soften after drying naturally). Step 3: The positive aluminum cap (4) is mounted in the plastic bracket (5) after the sealant has dried naturally, and then the PCBA (3) and the negative metal ring (2) are inserted in order to complete the manufacture of the lithium battery cap with the built-in PCBA (3); A manufacturing process for battery winding core, including: Step 1: Mix ingredients. Step 2: Applying Step 3: Seat manufacturing; Step 4: Winding up Finished product assembly process, including: Step 1: Insert the battery core (7) into the steel case (6) and laser weld the negative electrode aluminum sheet (11) to the inside bottom of the steel case (6); Step 2: Roll the groove of the steel case (6) so that the battery core (7) is fixed inside the steel case (6) and does not fall out. Step 3: Laser welding the positive electrode (8) of the battery core to the back edge of the positive aluminum cap (4); Step 4: Dry the components with the caps welded to remove moisture, inject the electrolyte, Step 5: Roll the entire opening of the steel case (6) inward and press it against the negative electrode metal ring (2) to seal it so that the negative electrode is conductive. Step 6: According to the customer's appearance requirements, cover the corresponding printing sleeve and print the code; Step 7: Place in a cabinet for chemical conversion and aging treatment. Step 8: Fully charge the rechargeable lithium batteries (12) after aging treatment, and separate the batteries with different capacities and voltages; Step 9: Packing the rechargeable lithium battery (12) in a special packaging box for safe storage and transportation.

2. Specifically, the implementation process is as follows: The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS board as claimed in claim 1, characterized in that the positive metal post (9), IC and other electronic components are mounted on the PCBA (3) to complete the mounting process of the BMS motherboard.

3. The plastic bracket (5) described in step 2 of the cap manufacturing process is made of PP soft material, and The sealant is injected into the sealant groove (10) and the bottom surface of the plastic bracket (5). The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate as claimed in claim 1, characterized in that the sealant groove (10) is opened on the inner wall of the plastic bracket (5).

4. Specifically, step 1 of the battery winding core manufacturing process is as follows: The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate according to claim 1, characterized in that: a solution is prepared; the positive electrode is PVDF and the solvent is NMP; and the negative electrode is SBR and CMC.

5. Specifically, step 2 of the battery winding core manufacturing process is as follows: The manufacturing process of the rechargeable cylindrical lithium battery incorporating the BMS substrate according to claim 1, characterized in that the prepared solution is applied onto an aluminum sheet.

6. Specifically, step 3 of the battery winding core manufacturing process is as follows: The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate as claimed in claim 1, characterized in that: the coated aluminum sheet, nickel sheet is filled with an adhesive tape separator, and then cut into suitable electrode sheet sizes.

7. Specifically, step 4 of the battery winding core manufacturing process is as follows: The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate according to claim 1, characterized in that the manufactured electrode sheet and the separator paper are wound into a cylindrical shape to complete the manufacture of the battery winding core.

8. The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate as claimed in claim 1, characterized in that in step 7 of the finished product assembly process, the time for chemical conversion treatment in cabinet is 2-3 days to activate the capacity of the cell, and the time for aging treatment is 8 days.

9. The plastic bracket (5) is connected to the top of the inner wall of the steel case (6), The positive aluminum cap (4) is placed in a plastic bracket (5), The PCBA (3) is placed in a positive aluminum cap (4), The negative metal ring (2) is placed on the upper outer edge of the PCBA (3); The positive metal pole (9) is connected to the upper center of the PCBA (3), The battery core (7) is connected to the inside of the steel case (6), The end of the positive electrode (8) of the battery winding core extends from the inside of the battery winding core (7), The negative aluminum sheet (11) is connected to the inner bottom end of the steel case (6); The manufacturing process of the rechargeable cylindrical lithium battery with built-in BMS substrate as claimed in claim 1, characterized in that a positive plastic cap (1) is connected to the outside of the positive metal pole (9).

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