Lithium battery electrode raw material feeding device, lithium battery production system and method thereof

Abstract

The application discloses a lithium battery electrode raw material feeding device and a method thereof. The device comprises a stirring tank for mixing raw materials into slurry and a plurality of storage tanks. The outlet end of each storage tank is communicated with the inner cavity of the stirring tank. A metering valve is arranged at the outlet of each storage tank. The feeding amount of the material stored in each storage tank is calculated by using a calculation formula considering the optimal stirring interval of the stirring tank, and air flow is introduced into the stirring tank for mixing, so that the mixing quality of the slurry is improved, and the foundation for subsequent production of high-quality lithium batteries is laid.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production, and more particularly to a lithium battery electrode raw material feeding device, a lithium battery production system, and a method thereof. Background Technology

[0002] Lithium-ion batteries, also known as lithium-ion power batteries, are a type of high-energy battery successfully developed in the mid-20th century. The negative electrode of this battery is a metal containing lithium ions, while the positive electrode uses materials such as MnO2 and SOCl2. Due to its advantages such as high energy density, high battery voltage, wide operating temperature range, and long storage life, lithium-ion batteries have been widely used in military and civilian fields. With technological advancements, large-capacity lithium-ion batteries can serve as a stable and reliable power source, making electric vehicle propulsion possible. Especially after 2020, the explosive growth of lithium-ion battery technology has driven the rapid development of electric vehicle technology. Besides electric vehicles, lithium-ion batteries are also widely used in artificial satellites, aerospace, and energy storage.

[0003] Existing lithium battery production technologies have the following problems: 1. The amount of material fed in the feed process is difficult to control; 2. When preparing the slurry for coating the current collector, if the particle size of the raw material is small, its specific surface area is large, making it difficult to control the particle size distribution. This leads to unreasonable local slurry ratios, which may not only cause instability in the same batch of electrodes, but also increase the internal resistance of the battery, reducing battery performance and lifespan; 3. After the electrodes are prepared, due to slight differences in the shape of each battery casing and electrode, the position of the electrode relative to the battery casing may be inaccurate. Moreover, due to the fact that the electrode may be blocked by other components, it is difficult to visually detect the incorrect electrode position. Incorrect electrode position will lead to poor product quality, such as decreased battery performance, burrs piercing the separator and causing short circuits after a period of use, increased battery internal resistance, and decreased coulombic efficiency in cycle performance. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a lithium battery electrode raw material feeding device, a lithium battery production system and method that can improve the quality of lithium batteries.

[0005] Technical solution: The lithium battery electrode raw material feeding device of the present invention includes a stirring tank for mixing raw materials into a slurry and several storage tanks. The outlet end of each storage tank is connected to the inner cavity of the stirring tank. A metering valve is installed at the outlet of each storage tank. The amount W of the material stored in each storage tank is calculated according to the following formula:

[0006]

[0007] Where V bα is the volume of the inner cavity of the mixing vessel, α is any proportion in [40%, 75%], S is the desired solid content of the slurry, P is the proportion of the material stored in each storage tank in the formula, and d is the density of the material stored in the storage tank.

[0008] Furthermore, the inner wall of the stirring vessel is provided with a plurality of air outlets arranged longitudinally, and the plurality of air outlets are connected to external fans. The air velocity at the air outlets is calculated by the following formula:

[0009]

[0010] Where v is the air velocity at the air outlet, Q is the gas flow rate, and A is the area of ​​the air outlet.

[0011] Furthermore, a stirring shaft is provided inside the stirring vessel, and several stirring blades are provided on the stirring shaft. The top of the stirring shaft extends out of the top of the stirring vessel, and the top of the stirring shaft is fixedly connected to the output end of the stirring motor.

[0012] Furthermore, a pressure relief valve is provided on the top of the stirred tank.

[0013] Furthermore, it also includes a coating device, which is connected to the output end of the mixing vessel.

[0014] The feeding method for lithium battery electrode raw materials is as follows:

[0015] Step 1: Based on the formula, calculate the amount of material W to be added to each storage tank using the following formula:

[0016]

[0017] Where Vb is the volume of the inner cavity of the mixing vessel, α is any proportion in [40%, 75%], S is the desired solid content of the slurry, P is the proportion of the material stored in each storage tank in the formula, and d is the density of the material stored in the storage tank.

[0018] Step 2: The metering valves of several storage tanks are opened respectively, and the material is fed into the mixing vessel according to the amount W calculated in Step 1.

[0019] Step 3: While the stirring motor is starting to stir the material, the blower is also turned on to send airflow into the mixing vessel. Calculate the air velocity at the air outlet using the following formula:

[0020]

[0021] Where v is the air velocity at the outlet, and it is controlled that 3m / s≤v≤7m / s, Q is the gas flow rate, and A is the area of ​​the outlet.

[0022] Step 4: After stirring, a slurry is obtained and then transported to the coating device.

[0023] A lithium battery production system includes a lithium battery electrode raw material feeding device and an electrode assembly device. The electrode assembly device includes a conveyor belt with a wire feeding station and a welding station on the conveyor belt. A first detection device is arranged between the wire feeding station and the welding station. The first detection device includes a first top detector for detecting the electrode's longitudinal position in the battery, a first side detector for detecting the electrode's lateral position in the battery, and a first calculation device. The first top detector and the first side detector are respectively connected to the first calculation device, and the first calculation device has a built-in electrode position error formula.

[0024] Furthermore, a material unloading station is provided at the end of the conveyor belt, and a second detection device is provided at the material unloading station. The second detection device includes a second top detector for detecting the electrode in the longitudinal position of the battery, a second side detector for detecting the electrode in the transverse position of the battery, and a second calculation device. The second top detector and the second side detector are respectively connected to the second calculation device, and the second calculation device has a built-in electrode position error formula.

[0025] Furthermore, the electrode position error formulas built into the first and second arithmetic devices are as follows:

[0026]

[0027] Where L is the error of the electrode position, R is the ratio of the area of ​​the intersection region to the area of ​​the union region of the two bounding boxes, c is the diagonal length of the minimum bounding rectangle covering the two boxes, d is the distance between the center points of the predicted box and the ground truth box, and p is the aspect ratio penalty term.

[0028] Furthermore, the wire feeding station is equipped with a wire feeding machine for feeding the welding wire to the welding area, and the welding station is equipped with a welding machine for welding the battery.

[0029] Furthermore, it also includes a first screening belt, which corresponds to the position of the first detection device, and a first screening robot arm for transferring defective products is set between the first screening belt and the first detection device.

[0030] Furthermore, the unloading station is equipped with a good product unloading belt for transporting qualified products and a second screening belt for transporting defective products, and an unloading robot is provided between the good product unloading belt, the second screening belt and the unloading station for unloading.

[0031] Furthermore, the first top detector and the first side detector are X-ray detectors.

[0032] Furthermore, the second top detector and the second side detector are X-ray detectors.

[0033] Furthermore, a polarity detection device for detecting the performance of the battery electrodes after welding is provided between the welding station and the unloading station, and the detection end of the polarity detection device corresponds to the conveyor belt.

[0034] Furthermore, a loading station for loading battery housings is provided at the beginning of the conveyor belt, and an electrode loading station is provided between the loading station and the welding wire loading station. An electrode loading robot is provided at the electrode loading station for placing the electrode onto the battery housing.

[0035] Furthermore, it also includes an upper electrode strip for transporting electrodes, the end of which corresponds to the position of the upper electrode manipulator.

[0036] Furthermore, the lithium battery electrode raw material feeding device includes a stirring tank for mixing the raw materials into a slurry and several storage tanks. The outlet end of each storage tank is connected to the inner cavity of the stirring tank. A metering valve is installed at the outlet of each storage tank. The amount W of the material stored in each storage tank is calculated according to the following formula:

[0037]

[0038] Where V b α is the volume of the inner cavity of the mixing vessel, α is any proportion in [40%, 75%], S is the desired solid content of the slurry, P is the proportion of the material stored in each storage tank in the formula, and d is the density of the material stored in the storage tank.

[0039] Furthermore, the inner wall of the stirring vessel is provided with a plurality of air outlets arranged longitudinally, and the plurality of air outlets are connected to external fans. The air velocity at the air outlets is calculated by the following formula:

[0040]

[0041] Where v is the air velocity at the air outlet, Q is the gas flow rate, and A is the area of ​​the air outlet.

[0042] Furthermore, a stirring shaft is provided inside the stirring vessel, and several stirring blades are provided on the stirring shaft. The top of the stirring shaft extends out of the top of the stirring vessel, and the top of the stirring shaft is fixedly connected to the output end of the stirring motor.

[0043] Furthermore, a pressure relief valve is provided on the top of the stirred tank.

[0044] Furthermore, it also includes a coating device, which is connected to the output end of the mixing vessel.

[0045] The assembly method for lithium battery electrodes follows these steps:

[0046] (A): Place a jig containing several battery casings into the loading station;

[0047] (B): When the fixture passes the upper electrode station on the conveyor belt, the upper electrode robot transfers the electrode on the upper electrode belt and installs it onto the corresponding battery casing.

[0048] (C): The conveyor belt transports the fixture to the upper welding wire station, and the upper welding wire machine set at the upper welding wire station places the welding wire at the weld seam;

[0049] (D): The conveyor belt transports the fixture to the first testing device. The first top detector and the first side detector of the first testing device emit X-rays to detect the relative position of the electrode and the battery casing. The electrode position error formula built into the first calculation device is used to detect whether the position of the electrode is within the acceptable range. If the position of the electrode is within the acceptable range, it is transported to the welding station by the conveyor belt. If the position of the electrode is outside the acceptable range, the battery is transferred to the first screening robot by the first screening belt and transported out.

[0050] (E): The conveyor belt transports the fixture to the welding station, where the welding machine welds the electrode to the battery casing together.

[0051] (F): The conveyor belt transports the fixture to the polarity detection device, which detects the polarity performance of the battery welded on the fixture.

[0052] (G): The conveyor belt transports the welded battery to the unloading station. The unloading robot grabs the battery and places it on the good product unloading belt. When passing the second detection device, the second top detector and the second side detector of the second detection device emit X-rays to detect the relative position of the electrode and the battery casing. The electrode position error formula built into the second calculation device is used to detect whether the position of the welded electrode is within the acceptable range. If the position of the electrode is within the acceptable range, it continues to be transported out by the good product unloading belt. If the position of the electrode is outside the acceptable range, the unloading robot transfers the battery to the second screening belt.

[0053] Furthermore, the formula for the electrode position error is as follows:

[0054]

[0055] Where L is the error of the electrode position, R is the ratio of the area of ​​the intersection region to the area of ​​the union region of the two bounding boxes, c is the diagonal length of the minimum bounding rectangle covering the two boxes, d is the distance between the center points of the predicted box and the ground truth box, and p is the aspect ratio penalty term.

[0056] Furthermore, the acceptable range L value for the electrode position is 0 ≤ L ≤ 0.05. That is, when 0 ≤ L ≤ 0.05, it means that the electrode position is within the acceptable range, and when 0.05 < L ≤ 1, it means that the electrode position is not within the acceptable range.

[0057] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: 1. When calculating the feeding, the present invention takes into account the optimal mixing range of the mixing tank, thus maximizing the mixing quality of the mixing tank and ensuring the uniform distribution of materials in the slurry; 2. During the mixing process in the mixing tank, airflow is introduced for mixing, and the airflow speed is controlled within a reasonable range, which improves the mixing effect and efficiency of materials and prevents negative effects such as air bubbles in the slurry caused by excessive airflow speed; 3. Both the first and second detection devices use X-rays to detect the position of the electrodes, eliminating the obstruction of the view by parts; 4. The first and second detection devices use built-in electrode position error formulas, which can more comprehensively consider geometric factors and solve sample imbalance problems, thereby improving the accuracy of electrode positioning and more accurately judging the relative positional relationship between the motor and the battery casing. This allows for the screening out of defective products with inaccurate positions before welding, enabling enterprises to reuse electrodes or battery casings that have not yet been welded. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the electrode raw material feeding device in this invention.

[0059] Figure 2 This is a cross-sectional view of the stirred tank in this invention.

[0060] Figure 3 This is a perspective view of the electrode assembly device in this invention from one angle.

[0061] Figure 4 This is a perspective view of the electrode assembly device in this invention from another angle.

[0062] Figure 5 for Figure 3 Enlarged view at point A.

[0063] Figure 6 for Figure 3 Enlarged view at point B.

[0064] Figure 7 for Figure 3 Enlarged view at point C.

[0065] Figure 8 This is a schematic diagram of the first detection device in the electrode assembly apparatus of the present invention.

[0066] Figure 9This is a schematic diagram of the feeding device in the electrode assembly apparatus of the present invention.

[0067] Figure 10 This is a flowchart of the feeding method for lithium battery electrode raw materials in this invention.

[0068] Figure 11 This is a flowchart of the assembly method of the lithium battery electrode in this invention.

[0069] The components include: 1. Storage tank; 101. Metering valve; 2. Fan; 3. Mixing vessel; 301. Pressure relief valve; 302. Mixing motor; 303. Vessel body; 304. Air outlet pipe; 3041. Air outlet; 305. Mixing shaft; 306. Mixing blades; 4. Coating device; 5. Conveyor belt; 501. Sensor; 6. Upper electrode belt; 7. Upper electrode robot; 8. Welding wire feeding machine; 9. First detection device; 901. First top detector; 902. First side detector; 10. First screening robot; 11. First screening belt; 12. Welding machine; 13. Polarity detection device; 14. Elevator; 15. Second screening belt; 16. Discharge device; 1601. Second top detector; 1602. Discharge robot; 1603. Second side detector; 17. Good product discharge belt. Detailed Implementation

[0070] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0071] See appendix Figures 1-9 The lithium battery production system shown in this invention includes a lithium battery electrode raw material feeding device, which includes a stirring tank 3 for mixing raw materials into a slurry and several storage tanks 1.

[0072] The outlet of each storage tank 1 is connected to the inner cavity of the mixing vessel 3. A metering valve 101 is installed at the outlet of each storage tank 1. The amount of material W stored in each storage tank 1 is calculated according to the following formula:

[0073]

[0074] Where V b α is the volume of the inner cavity of the mixing vessel 3, α is any proportion in [40%, 75%], S is the desired solid content of the slurry, P is the proportion of the material stored in each storage tank 1 in the formula, and d is the density of the material stored in the storage tank 1.

[0075] An air outlet duct 304 is installed inside the mixing vessel 3. The air outlet duct 304 is arranged longitudinally, and several air outlets 3041 are opened on the air outlet duct 304. A fan 2 is connected to the air outlet duct 304. The air velocity of the air outlets 3041 is calculated by the following formula:

[0076]

[0077] Where v is the wind speed at the air outlet 3041, Q is the gas flow rate, and A is the area of ​​the air outlet 3041.

[0078] The mixing vessel 3 includes a vessel body 303, a stirring shaft 305 is installed inside the vessel body 303, a plurality of stirring blades 306 are installed on the stirring shaft 305, the top of the stirring shaft 305 extends out of the top of the vessel body 303, and the top of the stirring shaft 305 is fixedly connected to the output end of the stirring motor 302; a pressure relief valve 301 is installed on the top of the vessel body 303, and the pressure relief valve 301 is used to release pressure when the gas pressure inside the vessel body 303 is too high.

[0079] It also includes a coating device 4, which is connected to the output end of the mixing vessel 3. The coating device 4 is used to coat the current collector with slurry to form an electrode sheet.

[0080] The lithium battery production system also includes an electrode assembly device, which includes a conveyor belt 5, and several sensors 501 are installed on any one or both sides of the conveyor belt 5.

[0081] The conveyor belt 5 is equipped with a loading station, an electrode loading station, a welding wire loading station, a welding station, and an unloading station in sequence from the first end to the last end.

[0082] The loading station for loading battery casings is located at the beginning of the conveyor belt 5. The upper electrode station is located between the loading station and the upper welding wire station. The upper electrode station is equipped with an upper electrode robot 7 for placing the electrode onto the battery casing. It also includes an upper electrode belt 6 for transporting the electrode. The end of the upper electrode belt 6 corresponds to the position of the upper electrode robot 7.

[0083] A wire feeding machine 8 is provided at the wire feeding station for feeding the welding wire to the welding area, and a welding machine 12 is provided at the welding station for welding the battery.

[0084] A first detection device 9 is installed between the wire welding station and the welding station. The first detection device 9 includes a first top detector 901 for detecting the electrode's longitudinal position in the battery, a first side detector 902 for detecting the electrode's lateral position in the battery, and a first calculation device (not shown). The first top detector 901 and the first side detector 902 are respectively connected to the first calculation device, which has a built-in electrode position error formula. The first top detector 901 and the first side detector 902 are X-ray detectors. The device also includes a first screening belt 11, which corresponds to the position of the first detection device 9. A first screening robot 10 for transferring defective products is installed between the first screening belt 11 and the first detection device 9.

[0085] A polarity detection device 13 is installed between the welding station and the unloading station to detect the performance of the battery electrodes after welding. The detection end of the polarity detection device 13 corresponds to the conveyor belt 5.

[0086] The unloading station is located at the end of the conveyor belt 5. A lift 14 is provided at the unloading station to lift the battery to a height that is convenient for the unloading device 16 to grab. The lift 14 can also be considered an extension of the unloading station.

[0087] To save space and facilitate operation, the second detection device and the unloading robot 1602 are integrated into an unloading device 16. The second detection device includes a second top detector 1601 for detecting the electrode's longitudinal position in the battery, a second side detector 1603 for detecting the electrode's lateral position in the battery, and a second calculation device (not shown). The second top detector 1601 and the second side detector 1603 are connected to the second calculation device. The second top detector 1601 and the second side detector 1603 are X-ray detectors. The second calculation device has a built-in electrode position error formula. A good product unloading belt 17 for transporting qualified products and a second screening belt 15 for transporting defective products are also provided at the unloading station. The unloading robot 1602 is positioned between the good product unloading belt 17, the second screening belt 15, and the unloading station.

[0088] The formulas for the electrode position error built into the first and second arithmetic units are as follows:

[0089]

[0090] Where L is the error of the electrode position, R is the ratio of the area of ​​the intersection region to the area of ​​the union region of the two bounding boxes, c is the diagonal length of the minimum bounding rectangle covering the two boxes, d is the distance between the center points of the predicted box and the ground truth box, and p is the aspect ratio penalty term.

[0091] See appendix Figures 1 to 11 The feeding method for lithium battery electrode raw materials shown in this invention comprises the following steps:

[0092] Step 1: Based on the formula, calculate the amount of material W to be added to each storage tank 1 using the following formula:

[0093]

[0094] Where V b α is the volume of the inner cavity of the mixing vessel 3, α is any proportion in [40%, 75%], S is the desired solid content of the slurry, P is the proportion of the material stored in each storage tank 1 in the formula, and d is the density of the material stored in the storage tank 1.

[0095] Step 2: Several storage tanks 1 open metering valves 101 respectively, and feed materials into the mixing vessel 3 according to the amount W calculated in step 1;

[0096] Step 3: While the stirring motor 302 starts stirring the material, the blower 2 is turned on to send airflow into the mixing vessel 3. The air velocity at the air outlet 3041 is calculated according to the following formula:

[0097]

[0098] Where v is the wind speed at the air outlet 3041, and it is controlled that 3m / s≤v≤7m / s, Q is the gas flow rate, and A is the area of ​​the air outlet 3041.

[0099] Step 4: After mixing, the slurry is obtained and transported to the coating device 4.

[0100] See appendix Figures 1 to 11 The assembly method of the lithium battery electrode shown in this invention comprises the following steps:

[0101] (A): Place a jig containing several battery casings into the loading station;

[0102] (B): When the fixture passes the upper electrode station on the conveyor belt 5, the upper electrode robot 7 transfers the electrode on the upper electrode belt 6 and installs it onto the corresponding battery casing.

[0103] (C): The conveyor belt 5 transports the fixture to the upper welding wire station, and the upper welding wire machine 8, which is set at the upper welding wire station, places the welding wire at the weld.

[0104] (D): Conveyor belt 5 transports the fixture to the first detection device 9. The first top detector 901 and the first side detector 902 of the first detection device 9 emit X-rays to detect the relative position of the electrode and the battery casing. The electrode position error formula built into the first calculation device is used to detect whether the position of the electrode is within an acceptable range. The electrode position error formula is as follows:

[0105]

[0106] Where L is the error of the electrode position, R is the ratio of the area of ​​the intersection region to the area of ​​the union region of the two bounding boxes, c is the diagonal length of the minimum bounding rectangle covering the two boxes, d is the distance between the center point of the predicted box and the real box, and p is the aspect ratio penalty term. If the electrode position L value is 0≤L≤0.05, it is transported to the welding station by the conveyor belt 5. If the electrode position L is 0.05<L≤1, the battery is transferred to the first screening robot 9 by the first screening belt 11 and transported out.

[0107] (E): The conveyor belt 5 transports the fixture to the welding station, where the welding machine 12, which is located at the welding station, welds the electrode to the battery casing into one piece.

[0108] (F): The conveyor belt 5 transports the fixture to the polarity detection device 13, which detects the polarity performance of the battery welded on the fixture.

[0109] (G): Conveyor belt 5 transports the welded batteries to the unloading station. The unloading robot 1602 picks up the batteries and places them on the good product unloading belt 17. When passing through the second detection device, the second top detector 1601 and the second side detector 1603 of the second detection device emit X-rays to detect the relative position of the electrodes and the battery casing. The electrode position error formula built into the second calculation device is used to detect whether the position of the welded electrodes is within an acceptable range. The electrode position error formula is as follows:

[0110]

[0111] Where L is the error of the electrode position, R is the ratio of the area of ​​the intersection region to the area of ​​the union region of the two bounding boxes, c is the diagonal length of the minimum bounding rectangle covering the two boxes, d is the distance between the center point of the predicted box and the true box, and p is the aspect ratio penalty term. If the electrode position L value is 0≤L≤0.05, it continues to be transported out by the good product unloading belt 17. If the electrode position L value is 0.05<L≤1, the unloading robot 1602 transfers the battery to the second screening belt 15.

Claims

1. A lithium battery production system comprising a lithium battery electrode raw material feeding device, characterized by: The electrode assembly device further comprises a conveying belt (5), an upper welding wire station and a welding station are arranged on the conveying belt (5), a first detection device (9) is arranged between the upper welding wire station and the welding station, the first detection device (9) comprises a first top detector (901) for detecting the longitudinal position of the electrode in the battery, a first side detector (902) for detecting the lateral position of the electrode in the battery and a first calculation device, the first top detector (901) and the first side detector (902) are connected with the first calculation device respectively, and an electrode position error formula is built in the first calculation device; the electrode position error formula is as follows: ， Wherein L is the error of the electrode position, R is the ratio of the intersection area of the two bounding boxes to the union area, c is the diagonal length of the minimum circumscribed rectangle covering the two boxes, d is the distance between the center points of the predicted box and the real box, and p is a penalty term of the aspect ratio; an unloading station is arranged at the end of the conveying belt (5), a second detection device is arranged at the unloading station, the second detection device comprises a second top detector (1601) for detecting the longitudinal position of the electrode in the battery, a second side detector (1603) for detecting the lateral position of the electrode in the battery and a second calculation device, the second top detector (1601) and the second side detector (1603) are connected with the second calculation device respectively, and an electrode position error formula is built in the second calculation device.

2. The lithium battery production system of claim 1, wherein: An upper welding wire machine (8) for providing welding wire for the welding station is arranged at the upper welding wire station, and a welding machine (12) for welding the battery is arranged at the welding station; a first screening belt (11) corresponding to the position of the first detection device (9) is arranged, and a first screening manipulator (10) for transferring defective products is arranged between the first screening belt (11) and the first detection device (9); a good product unloading belt (17) for transporting qualified products and a second screening belt (15) for transporting defective products are arranged at the unloading station, and an unloading manipulator (1602) for unloading is arranged between the good product unloading belt (17), the second screening belt (15) and the unloading station; a polarity detection device (13) for detecting the performance of the electrode of the battery after welding is arranged between the welding station and the unloading station, and the detection end of the polarity detection device (13) corresponds to the conveying belt (5); an upper electrode belt (6) for transporting the electrode is arranged between the upper electrode station and the upper electrode manipulator (7), and the terminal end of the upper electrode belt (6) corresponds to the position of the upper electrode manipulator (7).

3. The lithium battery production system of claim 1, wherein: The first top detector (901), the first side detector (902), the second top detector (1601) and the second side detector (1603) are X-ray detectors.

4. The lithium battery production system of claim 1, wherein: The lithium battery electrode raw material feeding device comprises a stirring tank (3) for mixing raw materials into slurry and a plurality of storage tanks (1), the outlet end of each storage tank (1) is communicated with the inner cavity of the stirring tank (3), and a metering valve (101) is arranged at the outlet of each storage tank (1); the feeding amount W of the material stored in each storage tank (1) is calculated according to the following formula: ， wherein V b is the volume of the inner cavity of the stirred tank (3), a is any proportion in [40%, 75%], S is the solid content of the slurry to be obtained, P is the proportion of the material stored in each storage tank (1) in the proportion, d is the density corresponding to the material stored in the storage tank (1); the inner wall of the stirred tank (3) is longitudinally arranged with a plurality of air outlets (3041), the plurality of air outlets (3041) are circumscribed with a fan (2), and the air speed of the air outlet is calculated by the following formula: ， Wherein v is the wind speed of the air outlet (3041), Q is the flow of the gas, and A is the area of the air outlet (3041); the stirring tank (3) is provided with a stirring shaft (305), a plurality of stirring blades (306) are arranged on the stirring shaft (305), the top of the stirring shaft (305) extends out of the top of the stirring tank (3), and the top of the stirring shaft (305) is fixedly connected with the output end of the stirring motor (302); and a pressure relief valve (301) is arranged at the top of the stirring tank (3).

5. A lithium battery electrode assembly method, comprising the following steps: (A): placing a jig loaded with a plurality of battery housings from a feeding station; (B): when the jig passes through an electrode loading station on a conveying belt (5), an electrode loading robot (7) transfers and installs electrodes on the electrode loading belt (6) to the corresponding battery housings; (C): the conveying belt (5) transports the jig to a welding wire loading station, and a welding wire loading machine (8) arranged at the welding wire loading station loads welding wires on the welding seams; (D): the conveying belt (5) transports the jig to a first detection device (9), a first top detector (901) and a first side detector (902) of the first detection device (9) emit X-ray to detect the relative position of the electrode and the battery housing, and whether the position of the electrode is within an acceptable range is detected by an electrode position error formula built in a first calculation device, the electrode position error formula is as follows: ， Wherein L is the error of the electrode position, R is the ratio of the intersection area of the two bounding boxes to the union area, c is the diagonal length of the minimum circumscribed rectangle covering the two boxes, d is the distance between the center points of the predicted box and the real box, and p is the penalty term of the aspect ratio, if the position L of the electrode is 0≤L≤0.05, the jig is transported to a welding station by the conveying belt (5), if the position L of the electrode is 0.05 (E): the conveying belt (5) transports the jig to a welding station, and a welding machine (12) arranged at the welding station welds the electrode and the battery housing into one body; (F): the conveying belt (5) transports the jig to a polarity detection device (13), and the polarity detection device (13) detects the polarity performance of the welded battery on the jig. (G): The conveying belt (5) transports the welded battery to the discharging station, the discharging manipulator (1602) grabs the battery and places it on the good product discharging belt (17), when passing through the second detection device, the second top detector (1601) and the second side detector (1603) of the second detection device emit X-ray to detect the relative position of the electrode and the battery shell, and through the electrode position error formula built in the second operation device, whether the position of the welded electrode is within the acceptable range is detected, the electrode position error formula is as follows: ， Wherein L is the error of the electrode position, R is the ratio of the intersection area of the two boundary boxes to the union area, c is the diagonal length of the minimum circumscribed rectangle covering the two boxes, d is the distance between the center points of the predicted box and the real box, and p is the penalty term of the aspect ratio. If the value of the electrode position L is 0≤L≤0.05, the battery is continuously transported out of the good product discharging belt (17); if the value of the electrode position L is 0.05

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