Assembly process of cylindrical lithium battery module

Abstract

According to the assembly process of the cylindrical lithium battery module provided by the invention, the reasonable assembly process flow of the cylindrical lithium battery module is adopted through the steps 1-19, so that the conditions of poor conductivity of a battery pack and liquid leakage of battery cells of the battery pack are effectively avoided; according to the invention, the battery pack welded on the positive and negative tabs of the battery cell and the protection plate spot welding are reinforced, so that the tensile strength of the battery pack welded on the positive and negative tabs of the battery cell and the protection plate spot welding is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery assembly processing, and more specifically, to an assembly process for a cylindrical lithium battery module. Background Art

[0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as positive / negative electrode material and non-aqueous electrolyte solution. In the early days, lithium battery PACK mainly refers to the processing and assembly of lithium-ion battery packs, which mainly combines lithium cells, lithium-ion battery protection boards, battery connectors, etc. into products required by customers through battery PACK process. With the gradual development of new energy vehicles, smart phones, laptops and other products in recent years, the demand for lithium batteries has gradually increased; the energy density of lithium-ion batteries has gradually increased. The traditional lithium battery PACK process only uses simple packaging for batteries, and there are no strict requirements, resulting in many unqualified lithium batteries.

[0003] The technology closest to the existing one is, Publication No.: CN111463393A, a battery pack PACK method, the production process of lithium battery PACK: battery cell appearance, thickness inspection → battery cell test → 3M double-sided tape on battery cell → bottom film on battery cell → nickel sheet on positive and negative electrodes of battery cell → spot welding nickel sheet on battery cell → spot welding protection plate → welding effect inspection → bracket sticking → initial performance inspection → finished product performance test → label paper alignment → label packaging → full appearance inspection → high temperature aging → load test → tape installation → box packing.

[0004] Lithium-ion battery PACK is the process of packaging lithium battery cells. The existing lithium battery PACK process mostly uses simple steps to package them, and the production process is also extremely non-standard, so poor conductivity and leakage of batteries often occur.

[0005] In view of this, the present invention proposes an assembly process for a cylindrical lithium battery module which is not only reasonable in structure and process, and easy to implement, but also can minimize the occurrence of poor conductivity of battery cells and leakage of battery cells. Summary of the invention

[0006] The purpose of the present invention is to propose an assembly process for a cylindrical lithium battery module which is not only reasonable in structure and process, and easy to implement, but also can minimize the occurrence of poor conductivity and leakage of battery cells.

[0007] An assembly process for a cylindrical lithium battery module, characterized in that it comprises the following steps:

[0008] Step 1: Cell veneer assembly. After loading, the cells flow into the veneer machine to complete the film lamination, and then the cells are assembled. The cell assembly requirements are: V: 3.8~3.9V; R≤40mΩ;

[0009] Step 2: Use hot melt glue to glue and fix the cells in groups of three to form a battery pack. The hot melt glue must completely fix the battery and cannot fall off, causing the battery to separate.

[0010] Step 3: Paste the highland barley paper, with the top of the highland barley paper facing down between the two battery cells, and the highland barley paper should be concave downward to make it completely attached;

[0011] Step 4: Spot weld the nickel strip on the protection plate and inspect it. Place the protection plate and nickel sheet on the tooling for spot welding. Spot weld the nickel strip to the position above the overlap between the protection plate and the nickel strip at the B+ / B- end. Spot weld the two nickel strips B+ / B- to the protection plate in a straight line, and then inspect it. If it fails the inspection, clean it or remove it.

[0012] Step 5: Insert the DC plug into the upper cover with the insertion hole facing upwards. Insert the DC plug into the upper cover, the red and black wires into the left jack, and the white and yellow wires into the right jack, forming an outward eight-shaped assembly, and insert all the wires into the upper cover;

[0013] Step 6: Apply sealant to the upper cover, and use silicone to seal the outer plug and inner plug of the upper cover, and completely seal the plug of the upper cover;

[0014] Step 7: Spot weld and inspect the battery pack and the protection plate. First, place the nickel strip in the center of the positive terminal of the battery pack and fix it for spot welding. Then bend the nickel sheet and the protection plate to the negative terminal of the battery and flatten the nickel sheet. Finally, place the battery nickel sheet under the electric welder for spot welding. Then inspect it. If it fails the inspection, clean it or discard it.

[0015] Step 8: Weld the upper cover of the protection board and inspect it. First, add tin to the welding points of the protection board, then weld the glued upper cover to the protection board, and then inspect it. If the inspection fails, clean it or remove it;

[0016] Step 9: Semi-finished product test, insert the product to be tested in step 8 into the corresponding test fixture in parallel, and use the corresponding plug that matches the battery plug for the test. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the test machine beeps, it is a failed product. After the "good product" is stable, remove the battery pack in parallel;

[0017] Step 10: Stick highland barley paper on the positive electrode, and stick the highland barley paper on the positive electrode of the battery in the center for insulation;

[0018] Step 11: Paste the positive and negative electrodes with EVA. Paste the positive electrode with two molded EVAs, with the short one attached to one end of the protection plate; paste the negative electrode with a rectangular EVA.

[0019] Step 12: Fix the wires and install the cover. Take the semi-finished product from step 11 and attach the cut high-temperature tape to the positive nickel strip of the battery pack to completely cover the nickel strip. Align the wires toward the positive electrode of the battery pack, offset the wires to the right, bend them in the space between the two EVAs, and then fix the wires with high-temperature tape to completely cover the core wire welding points. Install the battery pack into the cover; the protective plate faces upwards, the sealing hole of the cover is on the left, the battery pack and the cover must be assembled in place, and the battery pack, the cover and the wires must not be damaged.

[0020] Step 13: Glue the bottom, install the shell, and apply a piece of silicone on the negative electrode EVA; before the glue dries, install the shell and press it tightly;

[0021] Step 14: Ultrasonic welding: put the battery pack with the shell into the ultrasonic mold; add a protective film on the battery pack, press the ultrasonic button with both hands to perform ultrasonic welding, and the upper cover and the lower shell are completely assembled and sealed in place;

[0022] Step 15: Air tightness test: Use an air tightness tester to test the battery for air tightness;

[0023] Step 16: Glue the bottom and fill the detection hole with silicone. Do not allow the glue to get on the shell.

[0024] Step 17: Battery aging: insert the products in step 16 into the corresponding test fixture in parallel for aging;

[0025] Step 18: Full inspection of finished products. Insert the products to be tested in step 17 into the corresponding test fixture in parallel. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the tester beeps, it is a failed product. After the "good product" is stable, remove the battery in parallel;

[0026] Step 19: Label and pack. Place the battery flat on the table with the socket on the right side and facing upwards. Attach the label in the center of the battery.

[0027] In some embodiments, in step 1, the battery cells are loaded into a loading fixture, but the loading is not too full, and the positive electrodes are uniformly placed outwards.

[0028] Furthermore, in step one, after loading, the battery cells flow into the laminating machine to complete the laminating, and the battery cells with the laminating completed flow to the bridge induction. At this time, the laminating machine automatically pauses, and then the matching machine is started to perform matching; the matching requirements of the battery cells are: V: 3.8~3.9V; R≤40mΩ.

[0029] Furthermore, in step one, the battery cells in each gear slot after grouping are promptly taken out and placed in a material box with a corresponding mark, and flow into the next process to avoid jamming the machine and the battery cells falling on the store.

[0030] In some embodiments, in step 2, the individual battery cells are loaded into the fixture in a uniform direction in sequence. When placing them, the positive poles face the positive poles, the negative poles face the negative poles, and the positive and negative poles are placed in the same direction and cannot be placed upside down before the hot melt adhesive operation can be performed.

[0031] Furthermore, the positive pole of the battery cell is placed upward, and the negative pole of the battery cell is placed downward.

[0032] Furthermore, the hot melt adhesive needs to be applied evenly to completely fix the battery. If the adhesive is not applied enough, it is easy to fall off, resulting in separation of the battery pack.

[0033] In some embodiments, in step three, the positive electrode of each battery pack formed in step two is uniformly placed upward and the hot melt adhesive surface is placed downward before the highland barley paper pasting operation can be performed.

[0034] In some embodiments, in step four, 4 welding points are provided above the overlap of the protection plate and the nickel strip, and 4 welding points are provided above the overlap of the B+ / B- end protection plate and the nickel strip. The welding points are correctly aligned, and the protection plate needs to be spot welded to the nickel strip twice, 4 welding points, to ensure that the nickel strip does not have any undesirable phenomena such as missing welding and welding deviation; the welding points must be firm, and there must be no cold welding, false welding, over-welding, fried welding, and tin overflow.

[0035] Furthermore, the inspection of the spot-welded nickel strip on the protection plate needs to ensure that the protection plate and the nickel strip are free of dirt, tin beads, damage and other undesirable phenomena. If there is dirt or tin beads, they need to be cleaned with a toothbrush in time.

[0036] In some implementations, in step five, before installation, it is necessary to ensure that the DC plug is inserted in the correct direction, and the PIN pins must not be skewed or the DC head must not be damaged.

[0037] In some embodiments, in step six, when applying the sealant, the height cannot exceed the height and width of the sealant shell at the glue dispensing position, and should not affect the plugging and unplugging of the connector.

[0038] Furthermore, the upper cover coated with glue is placed neatly and orderly into the fixture plate. The glue needs to be left for about 8 hours, and the next workstation operation can be continued only after the glue is naturally dry.

[0039] In some embodiments, in step seven, the nickel strip is first placed in the center of the positive terminal of the battery pack and fixed and spot welded, with two spots at each battery cell, making four welds; after OK, the nickel sheet and the protection plate are bent to the negative electrode of the battery, and the nickel sheet is flattened, and finally the battery nickel sheet is placed under an electric welder for spot welding, with two spots at each battery cell, making four welds; the positive and negative nickel strips need to be welded to the positive and negative terminals of the battery respectively; each battery nickel strip has four welds, and at least 3 effective welds; there must be no cold welding, false welding, over welding, or fried welding.

[0040] Furthermore, during inspection, the protection plate needs to be above the barley, the P+ needs to face the positive electrode of the battery, and the nickel strips at both ends cannot exceed the leaking metal parts of the positive and negative electrodes.

[0041] In some embodiments, in step eight, the welding point position of the protection plate welding upper cover is correct and meets the welding requirements; red line-P+, black line-P-, yellow line-ID, white line-T, and the wire cannot be tinned, tin tipped, cold soldered, or burned.

[0042] In some embodiments, in step nine, when the tested product fails, the defective product must be marked with the reason for the failure, the good products must be separated from the defective products, the electrical test records must be kept, and the defective products must be placed in a defective product box.

[0043] Furthermore, the requirements for qualified products are: voltage 3.8-3.9V, internal resistance ≤100mΩ, overcurrent value: 7-11A, NTC is 8-11KΩ; ID is 210-230KΩ; short-circuit test is qualified.

[0044] Furthermore, a foolproof test is performed on qualified products to determine whether the PIN pin of the fixture is skewed.

[0045] In some embodiments, in step fifteen, the requirements for air tightness testing are: pressure holding value is 2.5+ / -0.25Kpa, leakage value is ±200pa, and pressure holding time is ≥1min.

[0046] In some implementations, in step eighteen, the requirements for qualified products are: voltage 3.95-4V, internal resistance ≤100mΩ, overcurrent value: 7-11A, NTC is 8-11KΩ; ID is 210-230KΩ; short circuit test is qualified.

[0047] In some embodiments, in step nineteen, the label is attached with a QR code content information description: JS-supplier code, LF3-model, CM-cell code, BS, year, month, day, serial code.

[0048] Beneficial effects of the present invention: The present invention proposes an assembly process for a cylindrical lithium battery module, which adopts a reasonable assembly process flow of a cylindrical lithium battery module through steps one to nineteen, thereby effectively avoiding the occurrence of poor conductivity of the battery pack and leakage of the battery cell; the present invention also reinforces the battery pack and the protection plate welded on the positive and negative ears of the battery cell by spot welding, thereby effectively increasing the tensile strength of the spot welding of the battery pack and the protection plate welded on the positive and negative ears of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the assembly process of a cylindrical lithium battery module of the present application.

[0050] Main component symbols

[0051] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0052] The following examples are described to assist the understanding of the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0053] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0054] At the same time, the connections between components or systems are not intended to be limited to direct connections, rather, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections.

[0055] Embodiment 1:

[0056] like Figure 1 The figure shows a schematic diagram of the assembly process of a cylindrical lithium battery module of the present application.

[0057] An assembly process for a cylindrical lithium battery module, characterized in that it comprises the following steps:

[0058] Step 1: Cell veneer assembly. After loading, the cells flow into the veneer machine to complete the film lamination, and then the cells are assembled. The cell assembly requirements are: V: 3.8~3.9V; R≤40mΩ;

[0059] Step 2: Use hot melt glue to glue and fix the cells in groups of three to form a battery pack. The hot melt glue must completely fix the battery and cannot fall off, causing the battery to separate.

[0060] Step 3: Paste the highland barley paper, with the top of the highland barley paper facing down between the two battery cells, and the highland barley paper should be concave downward to make it completely attached;

[0061] Step 4: Spot weld the nickel strip on the protection plate and inspect it. Place the protection plate and nickel sheet on the tooling for spot welding. Spot weld the nickel strip to the position above the overlap between the protection plate and the nickel strip at the B+ / B- end. Spot weld the two nickel strips B+ / B- to the protection plate in a straight line, and then inspect it. If it fails the inspection, clean it or remove it.

[0062] Step 5: Insert the DC plug into the upper cover with the insertion hole facing upwards. Insert the DC plug into the upper cover, the red and black wires into the left jack, and the white and yellow wires into the right jack, forming an outward eight-shaped assembly, and insert all the wires into the upper cover;

[0063] Step 6: Apply sealant to the upper cover, and use silicone to seal the outer plug and inner plug of the upper cover, and completely seal the plug of the upper cover;

[0064] Step 7: Spot weld and inspect the battery pack and the protection plate. First, place the nickel strip in the center of the positive terminal of the battery pack and fix it for spot welding. Then bend the nickel sheet and the protection plate to the negative terminal of the battery and flatten the nickel sheet. Finally, place the battery nickel sheet under the electric welder for spot welding. Then inspect it. If it fails the inspection, clean it or discard it.

[0065] Step 8: Weld the upper cover of the protection board and inspect it. First, add tin to the welding points of the protection board, then weld the glued upper cover to the protection board, and then inspect it. If the inspection fails, clean it or remove it;

[0066] Step 9: Semi-finished product test, insert the product to be tested in step 8 into the corresponding test fixture in parallel, and use the corresponding plug that matches the battery plug for the test. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the test machine beeps, it is a failed product. After the "good product" is stable, remove the battery pack in parallel;

[0067] Step 10: Stick highland barley paper on the positive electrode, and stick the highland barley paper on the positive electrode of the battery in the center for insulation;

[0068] Step 11: Paste the positive and negative electrodes with EVA. Paste the positive electrode with two molded EVAs, with the short one attached to one end of the protection plate; paste the negative electrode with a rectangular EVA.

[0069] Step 12: Fix the wires and install the cover. Take the semi-finished product from step 11 and attach the cut high-temperature tape to the positive nickel strip of the battery pack to completely cover the nickel strip. Align the wires toward the positive electrode of the battery pack, offset the wires to the right, bend them in the space between the two EVAs, and then fix the wires with high-temperature tape to completely cover the core wire welding points. Install the battery pack into the cover; the protective plate faces upwards, the sealing hole of the cover is on the left, the battery pack and the cover must be assembled in place, and the battery pack, the cover and the wires must not be damaged.

[0070] Step 13: Glue the bottom, install the shell, and apply a piece of silicone on the negative electrode EVA; before the glue dries, install the shell and press it tightly;

[0071] Step 14: Ultrasonic welding: put the battery pack with the shell into the ultrasonic mold; add a protective film on the battery pack, press the ultrasonic button with both hands to perform ultrasonic welding, and the upper cover and the lower shell are completely assembled and sealed in place;

[0072] Step 15: Air tightness test: Use an air tightness tester to test the battery for air tightness;

[0073] Step 16: Glue the bottom and fill the detection hole with silicone. Do not allow the glue to get on the shell.

[0074] Step 17: Battery aging: insert the products in step 16 into the corresponding test fixture in parallel for aging;

[0075] Step 18: Full inspection of finished products. Insert the products to be tested in step 17 into the corresponding test fixture in parallel. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the tester beeps, it is a failed product. After the "good product" is stable, remove the battery in parallel;

[0076] Step 19: Label and pack. Place the battery flat on the table with the socket on the right side and facing upwards. Attach the label in the center of the battery.

[0077] In step one, load the battery cells into the loading fixture, but do not fill it too full, and place the positive poles outward. After loading, the battery cells flow into the laminating machine to complete the laminating. The battery cells with the laminating completed flow to the bridge induction. At this time, the laminating machine automatically pauses, and then the matching machine is started; the matching is carried out; the battery cell matching requirements are: V: 3.8~3.9V; R≤40mΩ, and the battery cells in each gear slot after matching are taken out in time and placed in the material box with the corresponding mark, and flow into the next process to avoid the machine getting stuck and the battery cells falling on the store.

[0078] In step 2, load the individual battery cells into the fixture in the same direction. When placing them, the positive pole faces the positive pole, and the negative pole faces the negative pole. The positive and negative poles are placed in the same direction and cannot be reversed before applying hot melt glue. The positive pole of the battery cell is placed upwards and the negative pole of the battery cell is placed downwards. The hot melt glue needs to be applied evenly to ensure that the battery is completely fixed. If too little glue is applied, it is easy to fall off, resulting in separation of the battery pack.

[0079] In step three, place the positive poles of each battery pack formed in step two upwards and the hot melt adhesive side downwards before the highland barley paper pasting operation can be carried out.

[0080] In step 4, there are 4 welding points above the overlap of the protection plate and the nickel strip, and there are 4 welding points above the overlap of the B+ / B- end protection plate and the nickel strip. Align the welding point positions correctly. The protection plate spot welding nickel strip needs to be done twice, 4 welding points, to ensure that the nickel strip does not have any undesirable phenomena such as missing welding and welding deviation; the welding points must be firm, and there must be no cold welding, false welding, over welding, fried welding, and tin overflow. The inspection of the protection plate spot welding nickel strip needs to ensure that the protection plate and the nickel strip are free of dirt, tin beads, damage and other undesirable phenomena. If there is dirt or tin beads, they need to be cleaned with a toothbrush in time.

[0081] In step 5, before installation, you need to ensure that the DC plug is inserted in the correct direction, and the PIN pins must not be skewed or the DC head must not be damaged.

[0082] In step six, when applying sealant, the height must not exceed the height and width of the glue shell at the glue point, and do not affect the plugging and unplugging of the joints. Place the glued upper cover neatly and orderly into the fixture plate. The glue needs to be left for about 8 hours. After the glue is naturally dry, you can continue to the next workstation.

[0083] In step seven, first place the nickel strip on the center of the positive end of the battery pack and fix it and spot weld it, with two spots on each battery cell, making four welds. After it is OK, bend the nickel sheet and the protection plate to the negative electrode of the battery, and flatten the nickel sheet. Finally, place the battery nickel sheet under the electric welder for spot welding, with two spots on each battery cell, making four welds. The positive and negative nickel strips need to be welded to the positive and negative ends of the battery respectively. Each battery nickel strip has four welds, at least three effective welds. There should be no cold welding, false welding, over welding, or fried welding. During inspection, the protection plate needs to be above the barley, P+ needs to face the positive electrode of the battery, and the nickel strips at both ends cannot exceed the metal parts leaking from the positive and negative electrodes.

[0084] In step eight, the soldering point position of the protection plate welding cover is correct and meets the welding requirements; red line-P+, black line-P-, yellow line-ID, white line-T, and the wire cannot be tinned, tin tipped, cold soldered, or burned.

[0085] In step nine, when the test product fails, the defective products must be marked with the reasons for the failure, the good products and the defective products must be separated and placed, the electrical test records must be kept, and the defective products must be placed in the defective product box. The requirements for qualified products are: voltage 3.8-3.9V, internal resistance ≤100mΩ, overcurrent value: 7-11A, NTC is 8-11KΩ; ID is 210-230KΩ; short-circuit test is passed, and the qualified products are used for fool-proofing test to determine whether the fixture PIN needle is skewed.

[0086] In step 15, the requirements for air tightness testing are: pressure holding value is 2.5+ / -0.25Kpa, leakage value is ±200pa, and pressure holding time is ≥1min.

[0087] In step 18, the requirements for qualified products are: voltage 3.95-4V, internal resistance ≤100mΩ, overcurrent value: 7-11A, NTC is 8-11KΩ; ID is 210-230KΩ; short circuit test is qualified.

[0088] In step nineteen, a label is attached with a QR code with the following information: JS-supplier code, LF3-model, CM-cell code, BS, year, month, day, serial number.

[0089] Beneficial effects of the present invention: The present invention proposes an assembly process for a cylindrical lithium battery module, which adopts a reasonable assembly process flow of a cylindrical lithium battery module through steps one to nineteen, thereby effectively avoiding the occurrence of poor conductivity of the battery pack and leakage of the battery cell; the present invention also reinforces the battery pack and the protection plate welded on the positive and negative ears of the battery cell by spot welding, thereby effectively increasing the tensile strength of the spot welding of the battery pack and the protection plate welded on the positive and negative ears of the battery cell.

[0090] Although the present application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art, and several modifications and improvements may be made without departing from the concept of the present application, all of which belong to the protection scope of the present application. The multiple aspects and embodiments disclosed in the present application are only for illustration and are not intended to limit the present application. The actual protection scope of the present application shall be subject to the claims.

Claims

1. An assembly process for a cylindrical lithium battery module, characterized in that: The following steps are involved: Step 1: Cell veneer assembly. After loading, the cells flow into the veneer machine to complete the film lamination, and then the cells are assembled. The cell assembly requirements are: V: 3.8~3.9V; R≤40mΩ; Step 2: Use hot melt glue to glue and fix the cells in groups of three to form a battery pack. The hot melt glue must completely fix the battery and cannot fall off, causing the battery to separate. Step 3: Paste the highland barley paper, with the top of the highland barley paper facing down between the two battery cells, and the highland barley paper should be concave downward to make it completely attached; Step 4: Spot weld the nickel strip on the protection plate and inspect it. Place the protection plate and nickel sheet on the tooling for spot welding. Spot weld the nickel strip to the position above the overlap between the protection plate and the nickel strip at the B+ / B- end. Spot weld the two nickel strips B+ / B- to the protection plate in a "one" shape, and then inspect it. If it fails the inspection, clean it or remove it. Step 5: Insert the DC plug into the upper cover with the insertion hole facing upwards. Insert the DC plug into the upper cover, the red and black wires into the left jack, and the white and yellow wires into the right jack, forming an outward eight-shaped assembly, and insert all the wires into the upper cover; Step 6: Apply sealant to the upper cover, and use silicone to seal the outer plug and inner plug of the upper cover, and completely seal the plug of the upper cover; Step 7: Spot weld and inspect the battery pack and the protection plate. First, place the nickel strip in the center of the positive terminal of the battery pack and fix it for spot welding. Then bend the nickel sheet and the protection plate to the negative terminal of the battery and flatten the nickel sheet. Finally, place the battery nickel sheet under the electric welder for spot welding. Then inspect it. If it fails the inspection, clean it or discard it. Step 8: Weld the upper cover of the protection board and inspect it. First, add tin to the welding points of the protection board, then weld the glued upper cover to the protection board, and then inspect it. If the inspection fails, clean it or remove it; Step 9: Semi-finished product test, insert the product to be tested in step 8 into the corresponding test fixture in parallel, and use the corresponding plug that matches the battery plug for the test. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the test machine beeps, it is a failed product. After the "good product" is stable, remove the battery pack in parallel; Step 10: Stick highland barley paper on the positive electrode, and stick the highland barley paper on the positive electrode of the battery in the center for insulation; Step 11: Paste the positive and negative electrodes with EVA. Paste the positive electrode with two molded EVAs, with the short one attached to one end of the protection plate; paste the negative electrode with a rectangular EVA. Step 12: Fix the wires and install the cover. Take the semi-finished product from step 11 and attach the cut high-temperature tape to the positive nickel strip of the battery pack to completely cover the nickel strip. Align the wires toward the positive electrode of the battery pack, offset the wires to the right, bend them in the space between the two EVAs, and then fix the wires with high-temperature tape to completely cover the core wire welding points. Install the battery pack into the cover; the protective plate faces upwards, the sealing hole of the cover is on the left, the battery pack and the cover must be assembled in place, and the battery pack, the cover and the wires must not be damaged. Step 13: Glue the bottom, install the shell, and apply a piece of silicone on the negative electrode EVA; before the glue dries, install the shell and press it tightly; Step 14: Ultrasonic welding: put the battery pack with the shell into the ultrasonic mold; add a protective film on the battery pack, press the ultrasonic button with both hands to perform ultrasonic welding, and the upper cover and the lower shell are completely assembled and sealed in place; Step 15: Air tightness test: Use an air tightness tester to test the battery for air tightness; Step 16: Glue the bottom and fill the detection hole with silicone. Do not allow the glue to get on the shell. Step 17: Battery aging: insert the products in step 16 into the corresponding test fixture in parallel for aging; Step 18: Full inspection of finished products. Insert the products to be tested in step 17 into the corresponding test fixtures in parallel. If the screen displays "PASS test passed", it is a qualified product. Otherwise, it displays "charging function failure" and the tester beeps, it is a failed product. After the "good product" is stable, remove the batteries in parallel; Step 19: Label and pack. Place the battery flat on the table with the socket on the right side and facing upwards. Attach the label in the center of the battery.

2. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step one, load the battery cells into the loading fixture, do not load too full, and place the positive poles outward. In step one, after loading, the battery cells flow into the laminating machine to complete the film laminating. The battery cells with the film laminating completed flow to the bridge induction. At this time, the laminating machine automatically pauses, and then the matching machine is started; the matching is carried out; the matching requirements of the battery cells are: V: 3.8~3.9V; R≤40mΩ.

3. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step 2, load the individual battery cells into the fixture in the same direction. When placing them, the positive poles should face the positive poles, and the negative poles should face the negative poles. The positive and negative poles should be placed in the same direction and not reversed before applying the hot melt glue.

4. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step three, place the positive poles of each battery pack formed in step two upwards and the hot melt adhesive side downwards before the highland barley paper pasting operation can be carried out.

5. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step 4, there are 4 welding points above the overlap of the protection plate and the nickel strip, and there are 4 welding points above the overlap of the B+ / B- end protection plate and the nickel strip. Align the welding points correctly. The protection plate needs to be spot welded to the nickel strip twice, 4 welding points, to ensure that the nickel strip has no defective phenomena such as missing welding and welding deviation; the welding points must be firm, and there must be no cold welding, false welding, over-welding, fried welding, and tin overflow.

6. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step six, when applying sealant, the height must not exceed the height and width of the sealant shell at the glue-dispensing position, and must not affect the insertion and removal of the connector.

7. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step seven, first place the nickel strip on the center of the positive end of the battery pack and fix it and spot weld it, spot twice at each battery cell, making 4 welding points; after OK, bend the nickel sheet and the protection plate to the negative electrode of the battery, and flatten the nickel sheet, finally place the battery nickel sheet under the electric welding machine for spot welding, spot twice at each battery cell, making 4 welding points; the positive and negative nickel strips need to be welded to the positive and negative ends of the battery respectively; each battery nickel strip has four welding points, at least 3 effective welding points; there should be no cold welding, false welding, over welding, or fried welding.

8. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step nine, when the tested product fails, the defective product must be marked with the reason for the failure, the good products must be separated from the defective products, the electrical test records must be kept, and the defective products must be placed in the defective product box.

9. The assembly process of the cylindrical lithium battery module according to claim 1, characterized in that: In step 15, the requirements for air tightness testing are: pressure holding value is 2.5+ / -0.25Kpa, leakage value is ±200pa, and pressure holding time is ≥1min.

10. The assembly process of a cylindrical lithium battery module according to claim 1, characterized in that: In step 18, the requirements for qualified products are: voltage 3.95-4V, internal resistance ≤100mΩ, overcurrent value: 7-11A, NTC is 8-11KΩ; ID is 210-230KΩ; short circuit test is qualified.

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